/* =====================================================================
       APPLE HUMAN INTERFACE GUIDELINES (HIG) & LIQUID GLASS DESIGN SYSTEM
       Default Primary Accent: Vibrant Apple Orange (#FF8000)
       Contrast-tuned for WCAG AA compliance in both Light and Dark modes.
       ===================================================================== */
    :root, [data-theme="orange"], [data-theme="sage"] {
      --ios-accent: #FF8000;
      --md-bg: #F2F2F7;
      --md-surface: #FFFFFF;
      --md-surface-low: #E5E5EA;
      --md-surface-mid: #D1D1D6;
      --md-surface-high: #C7C7CC;
      --md-primary: #FF8000;
      --md-primary-accessible: #C84800;
      --md-on-primary: #FFFFFF;
      --md-primary-container: rgba(255, 128, 0, 0.12);
      --md-on-primary-container: #C84800;
      --md-secondary: #5856D6;
      --md-secondary-container: rgba(88, 86, 214, 0.12);
      --md-on-secondary-container: #3634A3;
      --md-tertiary: #FF9500;
      --md-tertiary-container: rgba(255, 149, 0, 0.14);
      --md-on-tertiary-container: #9E5A00;
      --md-text: #000000;
      --md-text-muted: #6C6C70;
      --md-outline: rgba(60, 60, 67, 0.16);
      --md-confirmed-bg: rgba(52, 199, 89, 0.14);
      --md-confirmed-fg: #248A3D;
      --md-tentative-bg: rgba(255, 149, 0, 0.14);
      --md-tentative-fg: #9E5A00;
      --md-danger-bg: rgba(255, 59, 48, 0.14);
      --md-danger-fg: #D70015;
      --md-warn-bg: rgba(255, 149, 0, 0.14);
      --md-warn-fg: #9E5A00;
    }

    [data-theme="blue"] {
      --ios-accent: #007AFF;
      --md-primary: #007AFF;
      --md-primary-accessible: #0062CC;
      --md-on-primary: #FFFFFF;
      --md-primary-container: rgba(0, 122, 255, 0.12);
      --md-on-primary-container: #0062CC;
      --md-secondary: #5856D6;
      --md-secondary-container: rgba(88, 86, 214, 0.12);
      --md-on-secondary-container: #3634A3;
      --md-tertiary: #30B0C7;
      --md-tertiary-container: rgba(48, 176, 199, 0.14);
      --md-on-tertiary-container: #005A69;
    }

    [data-theme="terracotta"] {
      --ios-accent: #D9480F;
      --md-primary: #D9480F;
      --md-primary-accessible: #B53606;
      --md-on-primary: #FFFFFF;
      --md-primary-container: rgba(217, 72, 15, 0.12);
      --md-on-primary-container: #B53606;
    }

    [data-theme="cobalt"] {
      --ios-accent: #5856D6;
      --md-primary: #5856D6;
      --md-primary-accessible: #4341B8;
      --md-on-primary: #FFFFFF;
      --md-primary-container: rgba(88, 86, 214, 0.12);
      --md-on-primary-container: #4341B8;
    }

    body.dark-mode,
    body.dark-mode[data-theme="orange"],
    body.dark-mode[data-theme="sage"] {
      color-scheme: dark;
      --ios-accent: #FF8000;
      --md-bg: #000000;
      --md-surface: #1C1C1E;
      --md-surface-low: #2C2C2E;
      --md-surface-mid: #3A3A3C;
      --md-surface-high: #48484A;
      --md-primary: #FF8000;
      --md-primary-accessible: #FF9F0A;
      --md-on-primary: #000000;
      --md-primary-container: rgba(255, 128, 0, 0.22);
      --md-on-primary-container: #FFB366;
      --md-secondary: #5E5CE6;
      --md-secondary-container: rgba(94, 92, 230, 0.22);
      --md-on-secondary-container: #D0CFFB;
      --md-tertiary: #FF9F0A;
      --md-tertiary-container: rgba(255, 159, 10, 0.22);
      --md-on-tertiary-container: #FFD180;
      --md-text: #FFFFFF;
      --md-text-muted: #98989D;
      --md-outline: rgba(84, 84, 88, 0.55);
      --md-confirmed-bg: rgba(48, 209, 88, 0.20);
      --md-confirmed-fg: #30D158;
      --md-tentative-bg: rgba(255, 159, 10, 0.20);
      --md-tentative-fg: #FF9F0A;
      --md-danger-bg: rgba(255, 69, 58, 0.20);
      --md-danger-fg: #FF453A;
      --md-warn-bg: rgba(255, 159, 10, 0.20);
      --md-warn-fg: #FF9F0A;
    }

    body.dark-mode[data-theme="blue"] {
      color-scheme: dark;
      --ios-accent: #0A84FF;
      --md-primary: #0A84FF;
      --md-primary-accessible: #409CFF;
      --md-on-primary: #000000;
      --md-primary-container: rgba(10, 132, 255, 0.24);
      --md-on-primary-container: #A4CDFF;
    }

    body.dark-mode[data-theme="terracotta"] {
      color-scheme: dark;
      --ios-accent: #FF7A45;
      --md-primary: #FF7A45;
      --md-primary-accessible: #FF9A6C;
      --md-on-primary: #000000;
      --md-primary-container: rgba(255, 122, 69, 0.24);
      --md-on-primary-container: #FFB38A;
    }

    body.dark-mode[data-theme="cobalt"] {
      color-scheme: dark;
      --ios-accent: #5E5CE6;
      --md-primary: #5E5CE6;
      --md-primary-accessible: #7D7AFF;
      --md-on-primary: #000000;
      --md-primary-container: rgba(94, 92, 230, 0.24);
      --md-on-primary-container: #C2C0FF;
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }

    html, body {
      overflow-x: hidden;
      max-width: 100vw;
    }

    body {
      font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
      background-color: var(--md-bg);
      color: var(--md-text);
      line-height: 1.5;
      padding-bottom: 64px;
      transition: background-color 0.25s ease, color 0.25s ease;
    }

    .font-display { font-family: 'Fraunces', Georgia, serif; }
    .font-mono { font-family: 'JetBrains Mono', monospace; }

    .icon {
      font-family: 'Material Symbols Rounded';
      font-weight: normal;
      font-style: normal;
      font-size: 20px;
      line-height: 1;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      vertical-align: middle;
      user-select: none;
    }

    .app-shell {
      max-width: 1420px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .top-bar {
      position: sticky;
      top: 12px;
      z-index: 40;
      margin-top: 12px;
      background: rgba(255, 255, 255, 0.9);
      backdrop-filter: blur(14px);
      border: 1px solid var(--md-outline);
      border-radius: 999px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      flex-wrap: wrap;
      box-shadow: 0 8px 28px rgba(0, 0, 0, 0.05);
    }

    body.dark-mode .top-bar {
      background: rgba(22, 31, 24, 0.88);
      box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
    }

    .brand-cluster {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
    }

    .logo-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--md-primary);
      color: var(--md-on-primary);
      padding: 8px 16px;
      border-radius: 999px;
      font-weight: 800;
      letter-spacing: -0.02em;
      font-size: 15px;
    }

    .trip-select {
      appearance: none;
      background: var(--md-surface-low);
      border: 1px solid var(--md-outline);
      color: var(--md-text);
      font-family: inherit;
      font-weight: 700;
      font-size: 14px;
      padding: 8px 34px 8px 14px;
      border-radius: 999px;
      cursor: pointer;
      background-image: linear-gradient(45deg, transparent 50%, var(--md-text) 50%), linear-gradient(135deg, var(--md-text) 50%, transparent 50%);
      background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%;
      background-size: 5px 5px, 5px 5px;
      background-repeat: no-repeat;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      border: none;
      font-family: inherit;
      font-weight: 700;
      font-size: 13px;
      padding: 8px 14px;
      border-radius: 999px;
      cursor: pointer;
      transition: transform 0.16s cubic-bezier(0.22, 1, 0.36, 1), background-color 0.16s ease;
      text-decoration: none;
      white-space: nowrap;
    }

    .btn:active { transform: scale(0.96); }
    .btn-primary { background: var(--md-primary); color: var(--md-on-primary); }
    .btn-tonal { background: var(--md-primary-container); color: var(--md-on-primary-container); }
    .btn-secondary { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }
    .btn-tertiary { background: var(--md-tertiary-container); color: var(--md-on-tertiary-container); }
    .btn-ghost { background: var(--md-surface-low); color: var(--md-text); border: 1px solid var(--md-outline); }
    .btn-subtle { background: transparent; color: var(--md-text-muted); border: 1px dashed var(--md-outline); font-size: 12px; padding: 6px 12px; }
    .btn-subtle:hover { background: var(--md-surface-low); color: var(--md-text); }

    .hero-card {
      margin-top: 18px;
      background: var(--md-surface-low);
      border: 1px solid var(--md-outline);
      border-radius: 32px;
      padding: 24px 28px;
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 20px;
      align-items: center;
    }

    .hero-eyebrow {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
      margin-bottom: 8px;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      padding: 4px 12px;
      border-radius: 999px;
      font-size: 12px;
      font-weight: 700;
      transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.12s ease;
      user-select: none;
    }
    .badge:active {
      transform: scale(0.93);
    }

    .badge-confirmed {
      background: var(--md-confirmed-bg);
      color: var(--md-confirmed-fg);
      cursor: pointer;
      border: 1px solid rgba(13, 59, 30, 0.2);
    }

    .badge-tentative {
      background: var(--md-tentative-bg);
      color: var(--md-tentative-fg);
      cursor: pointer;
      border: 1px dashed rgba(74, 40, 0, 0.45);
    }

    .hero-title {
      font-size: clamp(24px, 3vw, 38px);
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.15;
    }

    .hero-meta {
      margin-top: 8px;
      display: flex;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      color: var(--md-text-muted);
      font-size: 14px;
      font-weight: 600;
    }

    .hero-stats {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
    }

    .stat-squircle {
      background: var(--md-surface);
      border: 1px solid var(--md-outline);
      border-radius: 22px;
      padding: 12px 16px;
      min-width: 104px;
      text-align: center;
    }

    .stat-num {
      font-size: 22px;
      font-weight: 800;
      color: var(--md-primary);
      line-height: 1.1;
    }

    .stat-label {
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      color: var(--md-text-muted);
      margin-top: 2px;
    }

    .control-bar {
      margin-top: 16px;
      background: var(--md-surface);
      border: 1px solid var(--md-outline);
      border-radius: 26px;
      padding: 14px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      flex-wrap: wrap;
    }

    .crew-strip {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
    }

    .crew-chip {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      padding: 6px 13px 6px 8px;
      border-radius: 999px;
      background: var(--md-surface-low);
      border: 1.5px solid transparent;
      font-size: 13px;
      font-weight: 700;
      cursor: pointer;
      transition: all 0.16s ease, transform 0.12s ease;
      user-select: none;
    }
    .crew-chip:active {
      transform: scale(0.94);
    }

    .crew-chip.active {
      background: var(--md-primary-container);
      color: var(--md-on-primary-container);
      border-color: var(--md-primary);
    }

    .avatar-dot {
      width: 24px;
      height: 24px;
      border-radius: 999px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 11px;
      font-weight: 800;
      color: #fff;
    }

    .segmented-group {
      display: inline-flex;
      background: rgba(118, 118, 128, 0.12);
      padding: 3px;
      border-radius: 9px;
      border: none;
      gap: 2px;
      box-shadow: inset 0 0.5px 1px rgba(0, 0, 0, 0.08);
    }
    body.dark-mode .segmented-group {
      background: rgba(118, 118, 128, 0.24);
      box-shadow: inset 0 0.5px 1px rgba(0, 0, 0, 0.25);
    }

    .seg-btn {
      border: none;
      background: transparent;
      color: var(--md-text-muted);
      font-family: inherit;
      font-weight: 600;
      font-size: var(--fs-sm);
      padding: 6px 14px;
      border-radius: 7px;
      cursor: pointer;
      transition: all 0.18s cubic-bezier(0.32, 0.72, 0, 1), transform 0.12s ease;
      user-select: none;
    }
    .seg-btn:active {
      transform: scale(0.95);
    }
    .seg-btn:hover {
      color: var(--md-text);
    }

    .seg-btn.active {
      background: #FFFFFF;
      color: #000000;
      font-weight: 700;
      box-shadow: 0 3px 8px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.06);
    }
    body.dark-mode .seg-btn.active {
      background: #636366;
      color: #FFFFFF;
      box-shadow: 0 3px 8px rgba(0, 0, 0, 0.35);
    }

    .workspace-grid {
      margin-top: 20px;
      display: grid;
      grid-template-columns: 1.05fr 1.25fr;
      gap: 22px;
      align-items: start;
    }

    @media (max-width: 1040px) {
      .workspace-grid { grid-template-columns: 1fr; }
      .hero-card { grid-template-columns: 1fr; }
    }

    .section-panel {
      background: var(--md-surface);
      border: 1px solid var(--md-outline);
      border-radius: 30px;
      padding: 22px;
      margin-bottom: 22px;
    }

    .panel-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      flex-wrap: wrap;
      margin-bottom: 16px;
    }

    .panel-title-wrap {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .panel-icon {
      width: 40px;
      height: 40px;
      border-radius: 14px;
      background: var(--md-primary-container);
      color: var(--md-on-primary-container);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .panel-title { font-size: 20px; font-weight: 700; }
    .panel-subtitle { font-size: 12px; color: var(--md-text-muted); font-weight: 600; }

    .m3-card {
      background: var(--md-surface-low);
      border: 1.5px solid var(--md-outline);
      border-radius: 24px;
      padding: 18px;
      margin-bottom: 14px;
      transition: transform 0.16s ease, box-shadow 0.16s ease;
    }

    .m3-card.tentative-card {
      border-style: dashed;
      border-color: #D9822B;
      background: #FFFDF9;
    }

    body.dark-mode .m3-card.tentative-card {
      border-color: #F3B78B;
      background: rgba(93, 56, 22, 0.22);
    }

    .leg-editor-card {
      background: var(--md-surface);
      border: 1.5px solid var(--md-outline);
      border-radius: 20px;
      padding: 18px 20px;
      margin-bottom: 14px;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
      animation: cardFadeSlideIn 0.22s cubic-bezier(0.16, 1, 0.3, 1) both;
    }

    body.dark-mode .leg-editor-card {
      background: rgba(255, 255, 255, 0.035);
      border-color: rgba(255, 255, 255, 0.12);
      box-shadow: none;
    }

    .leg-editor-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 12px;
      padding-bottom: 12px;
      margin-bottom: 14px;
      border-bottom: 1px solid var(--md-outline);
      flex-wrap: wrap;
    }

    .leg-badge {
      display: inline-flex;
      align-items: center;
      font-family: 'JetBrains Mono', monospace;
      font-size: 11px;
      font-weight: 800;
      letter-spacing: 0.06em;
      padding: 3px 9px;
      border-radius: 8px;
      background: var(--md-primary-container);
      color: var(--md-on-primary-container);
    }


    .tz-badge {
      display: inline-flex;
      align-items: center;
      gap: 3px;
      font-family: 'JetBrains Mono', monospace;
      font-size: 11px;
      font-weight: 700;
      padding: 2px 7px;
      border-radius: 6px;
      background: var(--md-surface-mid);
      color: var(--md-text-muted);
      border: 1px solid var(--md-outline);
      vertical-align: middle;
    }

    .m3-card:hover { box-shadow: 0 8px 22px rgba(0, 0, 0, 0.05); }

    .checkout-notice {
      background: var(--md-surface-mid);
      border-left: 4px solid var(--md-tertiary);
      border-radius: 12px;
      padding: 8px 12px;
      margin-bottom: 10px;
      font-size: 12px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .day-pill {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--md-primary);
      color: var(--md-on-primary);
      font-weight: 800;
      font-size: 12px;
      padding: 4px 11px;
      border-radius: 10px;
    }

    .card-top {
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      gap: 10px;
      margin-bottom: 10px;
    }

    .card-title { font-size: 17px; font-weight: 800; color: var(--md-text); }

    .address-box {
      background: var(--md-surface);
      border: 1px solid var(--md-outline);
      border-radius: 16px;
      padding: 10px 12px;
      margin: 10px 0;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 10px;
      flex-wrap: wrap;
      font-size: 13px;
    }

    .flight-route-bar {
      background: var(--md-surface);
      border: 1px solid var(--md-outline);
      border-radius: 18px;
      padding: 14px 16px;
      margin: 10px 0;
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      align-items: center;
      gap: 12px;
    }

    .iata-code {
      font-size: 24px;
      font-weight: 800;
      letter-spacing: -0.03em;
      color: var(--md-primary);
    }

    .flight-line {
      display: flex;
      flex-direction: column;
      align-items: center;
      min-width: 110px;
      color: var(--md-text-muted);
      font-size: 11px;
      font-weight: 700;
    }

    .flight-line-track {
      width: 100%;
      height: 2px;
      background: var(--md-outline);
      position: relative;
      margin: 5px 0;
    }

    .modal-backdrop {
      position: fixed;
      inset: 0;
      background: rgba(15, 22, 17, 0.52);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      z-index: 100;
      display: none;
      align-items: center;
      justify-content: center;
      padding: 20px;
    }

    .modal-backdrop.open {
      display: flex;
      animation: backdropFadeIn 0.22s ease both;
    }

    .modal-dialog {
      background: var(--md-surface);
      border: 1px solid var(--md-outline);
      border-radius: 32px;
      max-width: 700px;
      width: 100%;
      max-height: 90vh;
      overflow-y: auto;
      padding: 26px;
      box-shadow: 0 24px 64px rgba(0, 0, 0, 0.22);
    }

    .modal-backdrop.open .modal-dialog {
      animation: modalPopIn 0.26s cubic-bezier(0.16, 1, 0.3, 1) both;
    }

    @keyframes backdropFadeIn {
      from { opacity: 0; }
      to { opacity: 1; }
    }

    @keyframes modalPopIn {
      from {
        opacity: 0;
        transform: scale(0.95) translateY(12px);
      }
      to {
        opacity: 1;
        transform: scale(1) translateY(0);
      }
    }

    @media (max-width: 640px) {
      .modal-backdrop.open .modal-dialog {
        animation: mobileSheetSlideUp 0.28s cubic-bezier(0.16, 1, 0.3, 1) both;
      }
    }

    @keyframes mobileSheetSlideUp {
      from {
        opacity: 0.5;
        transform: translateY(100%);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      margin-top: 14px;
    }

    .form-full { grid-column: 1 / -1; }

    .field-label {
      display: block;
      font-size: 12px;
      font-weight: 700;
      color: var(--md-text-muted);
      margin-bottom: 5px;
    }

    .field-input, .field-textarea, .field-select {
      width: 100%;
      padding: 10px 13px;
      border-radius: 14px;
      border: 1.5px solid var(--md-outline);
      background: var(--md-surface-low);
      color: var(--md-text);
      font-family: inherit;
      font-size: 14px;
      font-weight: 600;
    }

    .field-textarea { min-height: 120px; resize: vertical; }

    .toast-msg {
      position: fixed;
      bottom: 22px;
      right: 22px;
      z-index: 200;
      background: var(--md-text);
      color: var(--md-surface);
      padding: 12px 20px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 700;
      box-shadow: 0 10px 30px rgba(0,0,0,0.2);
      transform: translateY(140%);
      transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
    }

    .toast-msg.show { transform: translateY(0); }

    .readonly-banner {
      background: var(--md-tertiary-container);
      color: var(--md-on-tertiary-container);
      padding: 10px 18px;
      border-radius: 18px;
      font-size: 13px;
      font-weight: 700;
      margin-top: 12px;
      display: none;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      flex-wrap: wrap;
    }

    .readonly-mode .edit-only { display: none !important; }

    .crew-quick-picker {
      display: flex;
      flex-wrap: wrap;
      gap: 5px;
      margin-top: 6px;
    }

    .crew-quick-pill {
      border: 1px solid var(--md-outline);
      background: var(--md-surface);
      color: var(--md-text);
      font-family: inherit;
      font-size: 11px;
      font-weight: 700;
      padding: 3px 9px;
      border-radius: 999px;
      cursor: pointer;
      transition: all 0.14s ease;
    }

    .crew-quick-pill:hover,
    .crew-quick-pill.selected {
      background: var(--md-primary-container);
      color: var(--md-on-primary-container);
      border-color: var(--md-primary);
    }

    .crew-lookup-wrap {
      position: relative;
      width: 100%;
    }

    .crew-lookup-menu {
      position: absolute;
      top: calc(100% + 4px);
      left: 0;
      right: 0;
      z-index: 160;
      background: var(--md-surface);
      border: 1.5px solid var(--md-primary);
      border-radius: 16px;
      box-shadow: 0 14px 36px rgba(0, 0, 0, 0.16);
      max-height: 220px;
      overflow-y: auto;
      display: none;
      padding: 6px;
    }

    .crew-lookup-menu.open {
      display: block;
    }

    .crew-lookup-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
      width: 100%;
      border: none;
      background: transparent;
      color: var(--md-text);
      font-family: inherit;
      font-size: 13px;
      font-weight: 600;
      padding: 7px 10px;
      border-radius: 10px;
      cursor: pointer;
      text-align: left;
      transition: background-color 0.12s ease;
    }

    .crew-lookup-item:hover,
    .crew-lookup-item.active-opt {
      background: var(--md-surface-low);
    }

    .crew-lookup-item.is-selected {
      background: var(--md-primary-container);
      color: var(--md-on-primary-container);
    }
    /* =====================================================================
       DESIGN TOKENS: Apple Human Interface Guidelines (HIG)
       Shared across modern and legacy components.
       ===================================================================== */
    :root {
      --font-ui: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "SF Pro", "Inter", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
      --font-mono: "SF Mono", ui-monospace, Menlo, Monaco, "JetBrains Mono", monospace;

      /* spacing (4pt / 8pt iOS rhythm) */
      --sp-1: 4px; --sp-2: 8px; --sp-3: 12px; --sp-4: 16px; --sp-5: 20px; --sp-6: 24px; --sp-8: 32px;

      /* Apple HIG typography scale */
      --fs-xs: 0.75rem;    /* 12px: caption / secondary labels */
      --fs-sm: 0.875rem;   /* 14px: subheadline / footnote */
      --fs-body: 1rem;     /* 16px: callout / body */
      --fs-title: 1.125rem;/* 18px: headline */
      --fs-headline: 1.375rem; /* 22px: title 2 */
      --fs-time: 1.5rem;   /* 24px: title 1 */

      /* Apple continuous squircles */
      --r-sm: 8px; --r-md: 12px; --r-lg: 16px; --r-xl: 20px; --r-full: 999px;

      /* Apple soft diffused elevations */
      --elev-1: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
      --elev-2: 0 3px 12px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.04);
      --elev-3: 0 10px 32px rgba(0, 0, 0, 0.12), 0 2px 6px rgba(0, 0, 0, 0.04);

      --tap: 44px;
      --nav-h: 64px;
      --safe-b: env(safe-area-inset-bottom, 0px);
    }

    body.dark-mode {
      --elev-1: 0 1px 2px rgba(0, 0, 0, 0.5);
      --elev-2: 0 4px 16px rgba(0, 0, 0, 0.6);
      --elev-3: 0 12px 36px rgba(0, 0, 0, 0.8);
    }

    /* ---- Base typography ---- */
    html { -webkit-text-size-adjust: 100%; }
    html, body {
      overflow-x: hidden;
      max-width: 100vw;
    }

    body {
      font-family: var(--font-ui);
      font-size: var(--fs-body);
      padding-bottom: 0;
      -webkit-tap-highlight-color: transparent;
    }
    .font-display { font-family: var(--font-ui); letter-spacing: -0.01em; }
    .font-mono { font-family: var(--font-mono); }
    .sr-only {
      position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
      overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
    }
    .skip-link {
      position: absolute; left: -999px; top: 8px; z-index: 300;
      background: var(--md-primary); color: var(--md-on-primary);
      padding: 10px 16px; border-radius: var(--r-full); font-weight: 700;
    }
    .skip-link:focus { left: 12px; }
    :focus-visible { outline: 3px solid var(--md-primary); outline-offset: 2px; }
    button { font-family: inherit; }
    [hidden] { display: none !important; }

    /* ---- App shell (mobile-first, centered column on larger screens) ---- */
    .app-shell {
      max-width: 720px;
      margin: 0 auto;
      padding: 0 var(--sp-4) calc(var(--nav-h) + var(--safe-b) + 112px);
    }

    .sticky-head {
      position: sticky;
      top: 0;
      z-index: 40;
      margin: 0 calc(var(--sp-4) * -1);
      padding: 0 var(--sp-4);
      background: rgba(242, 242, 247, 0.82);
      backdrop-filter: saturate(180%) blur(24px);
      -webkit-backdrop-filter: saturate(180%) blur(24px);
      border-bottom: 0.5px solid var(--md-outline);
      transform: translateZ(0);
      will-change: transform;
    }
    body.dark-mode .sticky-head {
      background: rgba(0, 0, 0, 0.82);
      border-bottom: 0.5px solid var(--md-outline);
    }

    .appbar-main {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: var(--sp-2);
      width: 100%;
      min-width: 0;
      padding-top: calc(var(--sp-2) + env(safe-area-inset-top, 0px));
    }

    .trip-title-btn {
      display: inline-flex;
      align-items: center;
      gap: 2px;
      min-height: var(--tap);
      flex: 1 1 auto;
      min-width: 0;
      max-width: 100%;
      padding: 0 4px;
      margin-left: -4px;
      border: none;
      background: transparent;
      color: var(--md-text);
      border-radius: var(--r-md);
      cursor: pointer;
    }
    .trip-title-btn:hover { background: var(--md-surface-low); }
    .trip-title {
      font-size: var(--fs-headline);
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.022em;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
      min-width: 0;
    }
    .trip-title-btn .icon { font-size: 24px; flex: none; }

    .appbar-actions {
      display: flex;
      align-items: center;
      gap: 6px;
      flex: none;
    }

    .appbar-sub {
      font-size: var(--fs-sm);
      color: var(--md-text-muted);
      padding: 0 0 var(--sp-2);
      margin-top: calc(var(--sp-1) * -1);
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    .icon-btn {
      position: relative;
      flex: none;
      width: 36px;
      height: 36px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      border-radius: var(--r-full);
      background: rgba(118, 118, 128, 0.12);
      color: var(--md-text);
      cursor: pointer;
      transition: background-color 0.15s ease, transform 0.12s cubic-bezier(0.32, 0.72, 0, 1);
    }
    .icon-btn:hover { background: rgba(118, 118, 128, 0.20); }
    .icon-btn:active { background: rgba(118, 118, 128, 0.28); transform: scale(0.92); }
    .icon-btn .icon { font-size: 20px; }

    /* ---- Crew capsule filter (Apple HIG) ---- */
    .filter-bar {
      display: flex;
      align-items: center;
      gap: var(--sp-1);
      padding-bottom: var(--sp-2);
    }
    .chip-row {
      flex: 1;
      min-width: 0;
      display: flex;
      gap: var(--sp-2);
      overflow-x: auto;
      scrollbar-width: none;
      -webkit-overflow-scrolling: touch;
      padding: 2px 2px;
      mask-image: linear-gradient(to right, #000 calc(100% - 20px), transparent);
    }
    .chip-row::-webkit-scrollbar { display: none; }

    .chip {
      flex: none;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      min-height: 34px;
      padding: 0 var(--sp-3);
      border-radius: var(--r-full);
      border: 0.5px solid var(--md-outline);
      background: var(--md-surface);
      color: var(--md-text);
      font-size: var(--fs-sm);
      font-weight: 600;
      cursor: pointer;
      white-space: nowrap;
      box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
      transition: all 0.18s cubic-bezier(0.32, 0.72, 0, 1);
    }
    .chip .icon { font-size: 16px; }
    .chip .avatar-dot { width: 22px; height: 22px; font-size: 11px; margin-left: -4px; border-radius: 50%; }
    .chip.active {
      background: var(--md-primary);
      color: #FFFFFF;
      border-color: var(--md-primary);
      box-shadow: 0 2px 10px rgba(255, 128, 0, 0.38);
    }
    .chip.active::before { display: none; }
    .chip.active .avatar-dot { display: inline-flex; border: 1.5px solid #FFFFFF; }

    .filter-dot {
      position: absolute;
      top: 10px; right: 10px;
      width: 10px; height: 10px;
      border-radius: 50%;
      background: var(--md-primary);
      border: 2px solid var(--md-bg);
    }

    /* ---- Tabs ---- */
    .tab-panel {
      display: none;
      padding-top: var(--sp-4);
    }
    .tab-panel.active {
      display: block;
      animation: tabFadeIn 0.22s cubic-bezier(0.16, 1, 0.3, 1) both;
    }

    @keyframes tabFadeIn {
      from {
        opacity: 0;
        transform: translateY(6px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
    .seg-row { display: flex; margin-bottom: var(--sp-4); }
    .segmented-group .seg-btn { min-height: 36px; font-size: var(--fs-sm); padding: 0 var(--sp-4); }

    /* ---- Bottom navigation (Apple Floating Liquid Glass Pill) ---- */
    .bottom-nav {
      position: fixed;
      left: 50%;
      transform: translateX(-50%) translateZ(0);
      will-change: transform;
      bottom: max(16px, env(safe-area-inset-bottom, 16px));
      width: calc(100% - 32px);
      max-width: 440px;
      height: 60px;
      z-index: 50;
      background: rgba(255, 255, 255, 0.78);
      backdrop-filter: blur(28px) saturate(210%);
      -webkit-backdrop-filter: blur(28px) saturate(210%);
      border-radius: 9999px;
      border: 0.5px solid rgba(255, 255, 255, 0.75);
      box-shadow:
        0 16px 36px -4px rgba(0, 0, 0, 0.16),
        0 4px 12px -2px rgba(0, 0, 0, 0.08),
        inset 0 1px 1px 0 rgba(255, 255, 255, 0.95),
        inset 0 -0.5px 0 rgba(0, 0, 0, 0.04);
      padding: 4px 6px;
      transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1), opacity 0.25s ease;
    }
    body.dark-mode .bottom-nav {
      background: rgba(30, 30, 34, 0.82);
      border: 0.5px solid rgba(255, 255, 255, 0.14);
      box-shadow:
        0 18px 40px -4px rgba(0, 0, 0, 0.5),
        0 6px 16px -2px rgba(0, 0, 0, 0.3),
        inset 0 1px 1px 0 rgba(255, 255, 255, 0.22),
        inset 0 -0.5px 0 rgba(0, 0, 0, 0.4);
    }
    .bottom-nav-inner {
      width: 100%;
      height: 100%;
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      align-items: center;
      gap: 2px;
    }
    .nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2px;
      height: 52px;
      min-height: unset;
      border: none;
      border-radius: 9999px;
      background: transparent;
      color: var(--md-text-muted);
      font-size: 10px;
      font-weight: 500;
      letter-spacing: -0.1px;
      cursor: pointer;
      position: relative;
      transition: all 0.18s cubic-bezier(0.32, 0.72, 0, 1);
    }
    .nav-item:active {
      transform: scale(0.92);
    }
    .nav-item.active {
      color: var(--apple-accent, #FF8000);
      background: rgba(255, 128, 0, 0.12);
      font-weight: 700;
    }
    body.dark-mode .nav-item.active {
      background: rgba(255, 128, 0, 0.18);
      color: #FF9F0A;
    }
    .nav-icon {
      position: relative;
      width: 28px; height: 22px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: transparent !important;
      transition: transform 0.15s ease;
    }
    .nav-icon .icon {
      font-size: 22px;
      font-variation-settings: 'FILL' 0;
      transition: font-variation-settings 0.15s ease, color 0.15s ease;
    }
    .nav-item.active .nav-icon {
      color: var(--apple-accent, #FF8000);
    }
    body.dark-mode .nav-item.active .nav-icon {
      color: #FF9F0A;
    }
    .nav-item.active .nav-icon .icon {
      font-variation-settings: 'FILL' 1;
    }
    .nav-label {
      line-height: 1;
      font-size: 10.5px;
    }
    .nav-badge {
      position: absolute;
      top: -3px; right: -4px;
      min-width: 16px; height: 16px;
      padding: 0 4px;
      border-radius: var(--r-full);
      background: #FF3B30;
      color: #FFFFFF;
      font-size: 10px;
      font-weight: 800;
      line-height: 16px;
      text-align: center;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
    }
    body.dark-mode .nav-badge { color: #FFFFFF; }

    /* ---- FAB (Apple Floating Glass Capsule) ---- */
    .fab {
      position: fixed;
      right: max(var(--sp-4), calc((100vw - 440px) / 2 + var(--sp-4)));
      bottom: calc(76px + max(16px, env(safe-area-inset-bottom, 16px)));
      z-index: 45;
      height: 48px;
      min-width: 48px;
      padding: 0 var(--sp-4);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: var(--sp-2);
      border: 0.5px solid rgba(255, 255, 255, 0.4);
      border-radius: var(--r-full);
      background: var(--apple-accent, #FF8000);
      color: #FFFFFF;
      font-size: var(--fs-sm);
      font-weight: 700;
      letter-spacing: -0.01em;
      box-shadow: 0 6px 20px rgba(255, 128, 0, 0.45), 0 1px 3px rgba(0, 0, 0, 0.12);
      cursor: pointer;
      transition: padding 0.2s cubic-bezier(0.32, 0.72, 0, 1), transform 0.15s ease, box-shadow 0.15s ease;
    }
    .fab:hover {
      box-shadow: 0 8px 24px rgba(255, 128, 0, 0.55);
    }
    .fab:active {
      transform: scale(0.95);
    }
    .fab .icon { font-size: 22px; }
    .fab-label { max-width: 160px; overflow: hidden; white-space: nowrap; transition: max-width 0.2s ease, opacity 0.15s ease; }
    .fab.collapsed { padding: 0; width: 48px; }
    .fab.collapsed .fab-label { max-width: 0; opacity: 0; }
    .readonly-mode .fab { display: none; }

    /* ---- Bottom sheet ---- */
    .sheet-backdrop {
      position: fixed;
      inset: 0;
      z-index: 120;
      display: none;
      align-items: flex-end;
      justify-content: center;
      background: rgba(0, 0, 0, 0);
      transition: background-color 0.2s ease;
    }
    .sheet-backdrop.open { display: flex; }
    .sheet-backdrop.shown { background: rgba(10, 16, 12, 0.5); }
    .sheet {
      width: 100%;
      max-width: 720px;
      max-height: 88dvh;
      display: flex;
      flex-direction: column;
      background: var(--md-surface);
      color: var(--md-text);
      border-radius: 20px 20px 0 0;
      box-shadow: var(--elev-3);
      transform: translateY(100%);
      transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1);
      outline: none;
      padding-bottom: var(--safe-b);
    }
    .sheet-backdrop.shown .sheet { transform: translateY(0); }
    .sheet-grip { touch-action: none; cursor: grab; flex: none; }
    .sheet-handle {
      width: 36px; height: 5px;
      margin: 10px auto 6px;
      border-radius: var(--r-full);
      background: rgba(118, 118, 128, 0.35);
    }
    .sheet-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 4px var(--sp-3) var(--sp-2) var(--sp-4);
    }
    .sheet-title { font-size: var(--fs-title); font-weight: 700; letter-spacing: -0.015em; }
    .sheet-body { overflow-y: auto; padding: var(--sp-2) var(--sp-3) var(--sp-6); }
    body.sheet-open { overflow: hidden; }

    .sheet-list { display: flex; flex-direction: column; }
    .sheet-list-sep { margin-top: var(--sp-2); padding-top: var(--sp-2); border-top: 1px solid var(--md-outline); }
    .sheet-item {
      display: flex;
      align-items: center;
      gap: var(--sp-4);
      width: 100%;
      min-height: 56px;
      padding: var(--sp-2) var(--sp-3);
      border: none;
      border-radius: var(--r-md);
      background: transparent;
      color: var(--md-text);
      font-size: var(--fs-body);
      font-weight: 500;
      text-align: left;
      cursor: pointer;
    }
    .sheet-item:hover { background: var(--md-surface-low); }
    .sheet-item .icon { font-size: 24px; color: var(--md-text-muted); flex: none; }
    .sheet-item-text { flex: 1; min-width: 0; display: flex; flex-direction: column; }
    .sheet-item-sub { font-size: var(--fs-sm); color: var(--md-text-muted); font-weight: 400; }
    .sheet-item.danger, .sheet-item.danger .icon { color: var(--md-danger-fg); }
    .sheet-check { color: var(--md-primary) !important; }
    .sheet-section { padding: var(--sp-2) var(--sp-3) var(--sp-4); }
    .sheet-section .sheet-list { margin: 0 calc(var(--sp-3) * -1); }
    .sheet-section-title {
      font-size: var(--fs-xs);
      font-weight: 700;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      color: var(--md-text-muted);
      margin-bottom: var(--sp-2);
    }
    .sheet-note {
      display: flex;
      gap: var(--sp-3);
      align-items: flex-start;
      font-size: var(--fs-sm);
      color: var(--md-text-muted);
      margin-bottom: var(--sp-2);
    }
    .sheet-note .icon { font-size: 20px; flex: none; margin-top: 1px; }

    /* ---- Lists, rows, empty states ---- */
    .list-card {
      background: var(--md-surface);
      border: 1px solid var(--md-outline);
      border-radius: var(--r-lg);
      overflow: hidden;
    }
    .list-row {
      display: flex;
      align-items: center;
      gap: var(--sp-3);
      min-height: 64px;
      padding: var(--sp-2) var(--sp-2) var(--sp-2) var(--sp-4);
      cursor: pointer;
    }
    .list-row + .list-row { border-top: 1px solid var(--md-outline); }
    .list-row:hover { background: var(--md-surface-low); }
    .list-main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
    .list-title { font-size: var(--fs-body); font-weight: 600; }
    .list-sub { font-size: var(--fs-sm); color: var(--md-text-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    .avatar-lg {
      width: 40px; height: 40px;
      border-radius: 50%;
      display: inline-flex; align-items: center; justify-content: center;
      color: #fff; font-weight: 800; font-size: var(--fs-sm);
      flex: none;
    }
    .tag {
      display: inline-block;
      padding: 1px 8px;
      border-radius: var(--r-sm);
      background: var(--md-primary-container);
      color: var(--md-on-primary-container);
      font-size: var(--fs-xs);
      font-weight: 700;
      vertical-align: middle;
    }
    .empty-state {
      display: flex; flex-direction: column; align-items: center; gap: var(--sp-3);
      text-align: center;
      padding: var(--sp-8) var(--sp-4);
      color: var(--md-text-muted);
      animation: emptyStateFadeIn 0.28s cubic-bezier(0.16, 1, 0.3, 1) both;
    }
    @keyframes emptyStateFadeIn {
      from { opacity: 0; transform: scale(0.97); }
      to { opacity: 1; transform: scale(1); }
    }
    .empty-state .icon { font-size: 40px; }

    /* ---- Touch targets & readability for legacy cards/modals ---- */
    .btn { min-height: 44px; font-size: var(--fs-sm); padding: 0 var(--sp-4); justify-content: center; }
    .field-label { font-size: var(--fs-sm); }
    .field-input, .field-select, .field-textarea { min-height: 44px; font-size: 16px; }
    .badge { font-size: var(--fs-xs); }
    .readonly-banner { margin: var(--sp-3) 0 0; border-radius: var(--r-lg); font-size: var(--fs-sm); }
    .modal-dialog .btn-ghost, .modal-dialog .btn-tonal { min-height: 44px; }

    /* ---- Snackbar (existing #toast), lifted above floating bottom nav ---- */
    .toast-msg {
      left: 50%;
      right: auto;
      bottom: calc(76px + max(16px, env(safe-area-inset-bottom, 16px)));
      max-width: calc(100vw - 32px);
      transform: translate(-50%, 200%);
      opacity: 0;
      visibility: hidden;
      transition: transform 0.25s cubic-bezier(0.2, 0, 0, 1), opacity 0.2s ease, visibility 0s linear 0.25s;
      border-radius: var(--r-md);
      font-size: var(--fs-sm);
      z-index: 200;
    }
    .toast-msg.show { transform: translate(-50%, 0); opacity: 1; visibility: visible; transition-delay: 0s; }
    .toast-msg button { min-height: 36px; }

    /* ---- Onboarding Active State & Visibility ---- */
    body.onboarding-active .bottom-nav,
    body.onboarding-active #fab,
    body.onboarding-active .sticky-head,
    body.onboarding-active .readonly-banner,
    body.onboarding-active #main {
      display: none !important;
    }

    /* ---- Apple HIG & Liquid Glass Onboarding Hub ---- */
    .onboarding-hub {
      max-width: 640px;
      margin: 0 auto;
      padding: var(--sp-6) var(--sp-4) calc(var(--nav-h) + var(--safe-b) + 36px);
      position: relative;
    }

    /* Ambient Apple Lighting Glow */
    .onboarding-hub::before {
      content: "";
      position: absolute;
      top: -30px;
      left: 50%;
      transform: translateX(-50%);
      width: 440px;
      height: 220px;
      background: radial-gradient(ellipse 65% 55% at 50% 25%, rgba(255, 128, 0, 0.12), transparent 70%);
      pointer-events: none;
      z-index: 0;
    }
    body.dark-mode .onboarding-hub::before {
      background: radial-gradient(ellipse 65% 55% at 50% 25%, rgba(255, 128, 0, 0.18), transparent 70%);
    }

    .onboarding-hero {
      position: relative;
      z-index: 1;
      text-align: center;
      margin: var(--sp-4) 0 var(--sp-6);
    }

    .onboarding-eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 5px 14px;
      border-radius: var(--r-full);
      background: rgba(255, 128, 0, 0.12);
      border: 0.5px solid rgba(255, 128, 0, 0.28);
      color: var(--apple-accent);
      font-size: 11px;
      font-weight: 700;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      margin-bottom: var(--sp-4);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    body.dark-mode .onboarding-eyebrow {
      background: rgba(255, 128, 0, 0.18);
      border-color: rgba(255, 128, 0, 0.35);
      color: #FF9F0A;
    }

    .onboarding-logo-badge {
      width: 76px;
      height: 76px;
      margin: 0 auto var(--sp-4);
      border-radius: 22.5%;
      background: linear-gradient(145deg, #FF9F0A 0%, #FF5500 100%);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.55), 0 14px 32px rgba(255, 128, 0, 0.32);
      transition: transform 0.2s cubic-bezier(0.32, 0.72, 0, 1);
    }
    .onboarding-logo-badge:hover {
      transform: scale(1.04);
    }
    .onboarding-logo-badge .icon {
      font-size: 40px;
    }

    .onboarding-title {
      font-family: var(--font-ui);
      font-size: clamp(32px, 5.5vw, 42px);
      font-weight: 800;
      letter-spacing: -0.03em;
      line-height: 1.1;
      color: var(--md-text);
      margin: 0 0 var(--sp-2);
    }

    .onboarding-subtitle {
      font-size: 16px;
      color: var(--md-text-muted);
      max-width: 460px;
      margin: 0 auto;
      line-height: 1.45;
      letter-spacing: -0.01em;
    }

    .onboarding-section-title {
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      color: var(--md-text-muted);
      margin: 0 0 10px 4px;
    }

    .onboarding-actions-grid {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-bottom: var(--sp-6);
      position: relative;
      z-index: 1;
    }

    /* Apple Liquid Glass Inset Action Card */
    .onboarding-card {
      display: flex;
      align-items: center;
      gap: 14px;
      padding: 16px 18px;
      min-height: 64px;
      border-radius: var(--r-xl);
      background: rgba(255, 255, 255, 0.78);
      backdrop-filter: blur(28px) saturate(190%);
      -webkit-backdrop-filter: blur(28px) saturate(190%);
      border: 0.5px solid rgba(255, 255, 255, 0.9);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7), 0 4px 18px rgba(0, 0, 0, 0.035), 0 1px 2px rgba(0, 0, 0, 0.02);
      cursor: pointer;
      user-select: none;
      -webkit-tap-highlight-color: transparent;
      transition: transform 0.16s cubic-bezier(0.2, 0, 0, 1), background 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
    }
    body.dark-mode .onboarding-card {
      background: rgba(28, 28, 30, 0.72);
      border-color: rgba(255, 255, 255, 0.12);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1), 0 8px 24px rgba(0, 0, 0, 0.45);
    }
    .onboarding-card:hover {
      border-color: var(--apple-accent);
      transform: translateY(-1.5px);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8), 0 8px 24px rgba(0, 0, 0, 0.08);
    }
    body.dark-mode .onboarding-card:hover {
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.16), 0 10px 30px rgba(0, 0, 0, 0.6);
    }
    .onboarding-card:active {
      transform: scale(0.985);
      background: rgba(255, 255, 255, 0.65);
    }
    body.dark-mode .onboarding-card:active {
      background: rgba(28, 28, 30, 0.85);
    }

    /* Primary Action Highlight */
    .onboarding-card.primary-action-card {
      background: linear-gradient(135deg, rgba(255, 128, 0, 0.08) 0%, rgba(255, 255, 255, 0.86) 100%);
      border-color: rgba(255, 128, 0, 0.38);
    }
    body.dark-mode .onboarding-card.primary-action-card {
      background: linear-gradient(135deg, rgba(255, 128, 0, 0.18) 0%, rgba(28, 28, 30, 0.82) 100%);
      border-color: rgba(255, 128, 0, 0.45);
    }

    /* Apple SF Symbol-style squircle glyph icon */
    .onboarding-card-icon {
      width: 44px;
      height: 44px;
      border-radius: var(--r-md);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4);
    }
    .onboarding-card-icon .icon {
      font-size: 24px;
    }

    .onboarding-card-body {
      flex: 1;
      min-width: 0;
    }
    .onboarding-card-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--md-text);
      margin: 0 0 2px;
      letter-spacing: -0.015em;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .onboarding-card-desc {
      font-size: 13px;
      color: var(--md-text-muted);
      margin: 0;
      line-height: 1.35;
    }
    .onboarding-card-arrow {
      font-size: 20px;
      color: var(--md-text-muted);
      transition: transform 0.16s ease, color 0.16s ease;
      flex-shrink: 0;
    }
    .onboarding-card:hover .onboarding-card-arrow {
      transform: translateX(3px);
      color: var(--apple-accent);
    }

    /* Apple Grouped Inset Feature Showcase */
    .onboarding-features-card {
      border-radius: var(--r-xl);
      background: rgba(255, 255, 255, 0.72);
      backdrop-filter: blur(28px) saturate(190%);
      -webkit-backdrop-filter: blur(28px) saturate(190%);
      border: 0.5px solid rgba(255, 255, 255, 0.88);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65), 0 4px 20px rgba(0, 0, 0, 0.035);
      padding: 18px 20px;
      margin-bottom: var(--sp-6);
      position: relative;
      z-index: 1;
    }
    body.dark-mode .onboarding-features-card {
      background: rgba(28, 28, 30, 0.7);
      border-color: rgba(255, 255, 255, 0.1);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 8px 28px rgba(0, 0, 0, 0.4);
    }

    .onboarding-feature-row {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }
    .onboarding-feature-icon {
      width: 40px;
      height: 40px;
      border-radius: var(--r-md);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      margin-top: 2px;
    }
    .onboarding-feature-icon .icon {
      font-size: 22px;
    }
    .onboarding-feature-body {
      flex: 1;
      min-width: 0;
    }
    .onboarding-feature-title {
      font-size: 15px;
      font-weight: 700;
      color: var(--md-text);
      margin: 0 0 2px;
      letter-spacing: -0.015em;
    }
    .onboarding-feature-desc {
      font-size: 13.5px;
      color: var(--md-text-muted);
      line-height: 1.45;
      margin: 0;
    }

    /* Apple Indented Hairline Separator */
    .onboarding-separator {
      height: 0.5px;
      background: var(--md-outline);
      margin: 14px 0 14px 54px;
      border: none;
    }

    /* Apple Privacy Reassurance Footnote */
    .onboarding-privacy-footnote {
      text-align: center;
      max-width: 480px;
      margin: 0 auto;
      padding: 0 var(--sp-2);
      position: relative;
      z-index: 1;
    }
    .onboarding-privacy-glyph {
      width: 32px;
      height: 32px;
      margin: 0 auto 6px;
      border-radius: 50%;
      background: rgba(52, 199, 89, 0.12);
      color: #34C759;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    body.dark-mode .onboarding-privacy-glyph {
      background: rgba(48, 209, 88, 0.18);
      color: #30D158;
    }
    .onboarding-privacy-glyph .icon {
      font-size: 18px;
    }
    .onboarding-privacy-text {
      font-size: 12px;
      line-height: 1.5;
      color: var(--md-text-muted);
      margin: 0;
    }

    /* ---- Welcome Modal Phrase Cards (Concise Disclosure) ---- */
    .welcome-phrase-card {
      border: 1px solid var(--md-outline);
      border-radius: var(--r-md);
      background: var(--md-surface-card);
      overflow: hidden;
      cursor: pointer;
      transition: background 0.15s ease, border-color 0.15s ease, transform 0.12s ease;
    }
    .welcome-phrase-card:hover {
      border-color: var(--apple-accent);
    }
    .welcome-phrase-head {
      display: flex;
      align-items: center;
      padding: 12px 14px;
      gap: 10px;
    }
    .phrase-icon {
      font-size: 20px;
      color: var(--apple-accent);
      flex-shrink: 0;
    }
    .phrase-text {
      flex: 1;
      font-size: 14.5px;
      font-weight: 600;
      color: var(--md-text);
      letter-spacing: -0.15px;
    }
    .phrase-arrow {
      font-size: 20px;
      color: var(--md-text-muted);
      transition: transform 0.2s cubic-bezier(0.32, 0.72, 0, 1);
    }
    .welcome-phrase-card.expanded .phrase-arrow {
      transform: rotate(180deg);
    }
    .phrase-detail {
      max-height: 0;
      overflow: hidden;
      opacity: 0;
      padding: 0 14px;
      font-size: 13px;
      color: var(--md-text-muted);
      line-height: 1.45;
      transition: max-height 0.25s cubic-bezier(0.32, 0.72, 0, 1), opacity 0.2s ease, padding 0.2s ease;
    }
    .welcome-phrase-card.expanded .phrase-detail {
      max-height: 140px;
      opacity: 1;
      padding: 0 14px 14px 14px;
    }

    /* ---- Mobile: existing modals become full-screen sheets ---- */
    @media (max-width: 640px) {
      .modal-backdrop { padding: 0; align-items: stretch; }
      .modal-dialog {
        max-width: 100% !important;
        width: 100%;
        height: 100dvh;
        max-height: 100dvh;
        border-radius: 0;
        border: none;
        padding: var(--sp-4) var(--sp-4) calc(var(--sp-6) + var(--safe-b));
      }
      .form-grid { grid-template-columns: 1fr; }
      .leg-editor-card .form-full[style*="1fr 1fr 1fr"] { grid-template-columns: 1fr 1fr !important; }
      .leg-editor-card .form-full[style*="1fr 1fr 1fr"] > div:last-child { grid-column: 1 / -1; }
    }

    /* ---- Selection Mode & Contextual Bar (Stage d) ---- */
    .selection-appbar {
      display: flex;
      align-items: center;
      width: 100%;
      min-height: 44px;
      overflow: hidden;
    }
    .selection-appbar-main {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      gap: 6px;
      overflow: hidden;
    }
    .selection-count {
      font-weight: 700;
      font-size: 14px;
      color: var(--md-text);
      white-space: nowrap;
    }
    .selection-actions {
      display: flex;
      align-items: center;
      gap: 4px;
      flex: none;
    }
    #selectModeBtn {
      width: 36px;
      min-width: 36px;
      max-width: 36px;
      height: 36px;
      min-height: 36px;
      padding: 0;
      border-radius: var(--r-full);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      flex: none;
      overflow: hidden;
    }
    #selectModeBtn .icon {
      font-size: 18px;
      margin: 0;
    }
    .select-btn-text {
      display: none;
    }

    @media (min-width: 641px) {
      #selectModeBtn {
        width: auto;
        min-width: auto;
        max-width: none;
        padding: 0 12px;
        gap: 4px;
      }
      .select-btn-text {
        display: inline;
        font-size: 12px;
        font-weight: 700;
      }
    }

    @media (max-width: 480px) {
      .trip-title { font-size: 16px !important; }
      .selection-actions .btn {
        padding: 0 8px !important;
        font-size: 11px !important;
        min-height: 32px !important;
      }
      .selection-count {
        font-size: 13px !important;
      }
    }

    /* ---- Stage E: Compact cards for Stays, Cars & Crew ---- */
    @keyframes cardFadeSlideIn {
      from {
        opacity: 0;
        transform: translateY(6px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .compact-card {
      display: flex;
      align-items: center;
      gap: var(--sp-3);
      min-height: 64px;
      padding: var(--sp-3);
      background: var(--md-surface);
      border: 1px solid var(--md-outline);
      border-radius: var(--r-lg);
      cursor: pointer;
      box-shadow: var(--elev-1);
      transition: transform 0.12s ease, border-color 0.15s ease, background-color 0.15s ease;
      -webkit-tap-highlight-color: transparent;
      margin-bottom: var(--sp-2);
      animation: cardFadeSlideIn 0.22s cubic-bezier(0.16, 1, 0.3, 1) both;
    }
    .compact-card:hover {
      border-color: var(--md-primary);
      background: var(--md-surface-low);
    }
    .compact-card:active {
      transform: scale(0.985);
    }
    .compact-card.tentative-row {
      border-style: dashed;
      border-color: var(--md-tentative-fg);
      background: var(--md-tentative-bg);
      opacity: 0.95;
    }
    body.dark-mode .compact-card.tentative-row {
      background: rgba(92, 58, 10, 0.28);
    }
    .compact-card.selected-row {
      border-color: var(--md-primary);
      background: var(--md-primary-container);
    }
    .compact-card-main {
      flex: 1 1 auto;
      min-width: 0;
      display: flex;
      flex-direction: column;
      gap: 3px;
    }
    .compact-card-title {
      font-weight: 700;
      font-size: 15px;
      color: var(--md-text);
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }
    .compact-card-sub {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      color: var(--md-text-muted);
    }
    .car-time-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 8px;
      margin: 4px 0;
      padding: 6px 10px;
      background: var(--md-surface-low);
      border-radius: var(--r-sm);
      border: 1px solid var(--md-outline);
    }
    .stay-day-section {
      margin-bottom: var(--sp-4);
    }
    .selection-checkbox-wrap {
      display: flex;
      align-items: center;
      justify-content: center;
      flex: none;
      width: 32px;
      height: 32px;
      margin-right: 6px;
    }
    .selection-checkbox {
      width: 20px;
      height: 20px;
      accent-color: var(--md-primary);
      cursor: pointer;
      border-radius: 4px;
    }
    .selected-row {
      background: rgba(62, 99, 115, 0.12) !important;
      border-color: var(--md-primary) !important;
    }
    body.dark-mode .selected-row {
      background: rgba(162, 203, 219, 0.16) !important;
      border-color: var(--md-primary) !important;
    }
    .danger-btn {
      color: var(--md-danger-fg) !important;
    }
    .danger-btn:disabled {
      opacity: 0.35 !important;
      cursor: not-allowed !important;
    }

    /* ---- Flight Tab Components (Stage b & c) ---- */
    .flight-view-nav {
      display: flex;
      flex-direction: column;
      gap: var(--sp-2);
      margin-bottom: var(--sp-3);
    }
    .flight-dir-chips {
      display: flex;
      gap: var(--sp-2);
      overflow-x: auto;
      scrollbar-width: none;
      padding: 2px 0;
    }
    .flight-dir-chips::-webkit-scrollbar { display: none; }

    /* Me Hero Card (Apple Wallet / Passbook Style) */
    .me-hero-card {
      background: var(--md-surface);
      border: 0.5px solid var(--md-outline);
      border-radius: var(--r-xl);
      padding: var(--sp-4);
      margin-bottom: var(--sp-4);
      box-shadow: var(--elev-1);
    }
    .me-hero-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: var(--sp-2);
      margin-bottom: var(--sp-3);
      flex-wrap: wrap;
    }
    .me-hero-title {
      font-size: var(--fs-title);
      font-weight: 800;
      display: flex;
      align-items: center;
      gap: 6px;
      color: var(--md-text);
    }
    .me-countdown-pill {
      font-size: var(--fs-xs);
      font-weight: 700;
      padding: 3px 10px;
      border-radius: var(--r-full);
      background: var(--md-primary-container);
      color: var(--md-on-primary-container);
    }
    .me-flight-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: var(--sp-3);
      margin-bottom: var(--sp-3);
    }
    @media (max-width: 480px) {
      .me-flight-grid { grid-template-columns: 1fr; }
    }
    .me-flight-box {
      background: var(--md-surface-low);
      padding: var(--sp-3);
      border-radius: var(--r-md);
      font-size: var(--fs-sm);
      border: 0.5px solid var(--md-outline);
      cursor: pointer;
      user-select: none;
      -webkit-tap-highlight-color: transparent;
      transition: transform 0.16s cubic-bezier(0.2, 0, 0, 1), border-color 0.16s ease, background-color 0.16s ease, box-shadow 0.16s ease;
      position: relative;
    }
    .me-flight-box:hover {
      border-color: var(--apple-accent);
      background: var(--md-surface);
      transform: translateY(-1.5px);
      box-shadow: 0 4px 14px rgba(0, 0, 0, 0.06);
    }
    body.dark-mode .me-flight-box:hover {
      box-shadow: 0 6px 18px rgba(0, 0, 0, 0.4);
    }
    .me-flight-box:active {
      transform: scale(0.98);
    }

    /* ---- Apple HIG Car Fleet Capacity Card ---- */
    .car-fleet-capacity-card {
      border-radius: var(--r-xl);
      background: rgba(255, 255, 255, 0.76);
      backdrop-filter: blur(24px) saturate(190%);
      -webkit-backdrop-filter: blur(24px) saturate(190%);
      border: 0.5px solid rgba(255, 255, 255, 0.88);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65), 0 4px 18px rgba(0, 0, 0, 0.04);
      padding: var(--sp-4);
      margin-bottom: var(--sp-4);
    }
    body.dark-mode .car-fleet-capacity-card {
      background: rgba(28, 28, 30, 0.72);
      border-color: rgba(255, 255, 255, 0.12);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1), 0 8px 24px rgba(0, 0, 0, 0.45);
    }
    .fleet-cap-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
      flex-wrap: wrap;
      margin-bottom: var(--sp-3);
    }
    .fleet-cap-title {
      font-size: var(--fs-title);
      font-weight: 800;
      color: var(--md-text);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.015em;
    }
    .fleet-cap-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      margin-bottom: var(--sp-3);
    }
    @media (max-width: 480px) {
      .fleet-cap-grid {
        grid-template-columns: 1fr;
      }
    }
    .fleet-stat-box {
      background: var(--md-surface-low);
      border: 0.5px solid var(--md-outline);
      border-radius: var(--r-md);
      padding: 10px 14px;
      text-align: center;
    }
    .fleet-stat-num {
      font-size: 20px;
      font-weight: 800;
      line-height: 1.1;
      color: var(--md-text);
    }
    .fleet-stat-label {
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--md-text-muted);
      margin-top: 3px;
    }
    .fleet-drivers-row {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
      padding-top: var(--sp-2);
      border-top: 0.5px solid var(--md-outline);
    }
    .me-flight-dir {
      font-size: var(--fs-xs);
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--md-text-muted);
      margin-bottom: 2px;
    }
    .me-flight-time {
      font-size: var(--fs-headline);
      font-weight: 800;
      color: var(--md-text);
      line-height: 1.2;
    }
    .me-nearby-box {
      border-top: 1px dashed var(--md-outline);
      padding-top: var(--sp-3);
      margin-top: var(--sp-2);
    }
    .me-nearby-title {
      font-size: var(--fs-xs);
      font-weight: 700;
      color: var(--md-text-muted);
      text-transform: uppercase;
      letter-spacing: 0.04em;
      margin-bottom: var(--sp-2);
    }
    .me-nearby-list {
      display: flex;
      flex-direction: column;
      gap: var(--sp-2);
    }
    .me-nearby-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: var(--sp-2);
      font-size: var(--fs-sm);
      background: var(--md-surface-low);
      padding: 8px 12px;
      border-radius: var(--r-sm);
    }

    /* Day Section & Sticky Header */
    .flight-day-section {
      margin-bottom: var(--sp-5);
    }
    .flight-day-header {
      position: sticky;
      top: 96px;
      z-index: 20;
      background: var(--md-bg);
      padding: var(--sp-2) 0;
      margin-bottom: var(--sp-2);
      border-bottom: 1px solid var(--md-outline);
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      gap: var(--sp-2);
      flex-wrap: wrap;
    }
    .flight-day-title {
      font-size: var(--fs-title);
      font-weight: 800;
      letter-spacing: -0.01em;
    }
    .flight-day-summary {
      font-size: var(--fs-xs);
      font-weight: 700;
      color: var(--md-text-muted);
    }

    /* Compact Flight Row (~64-74px) */
    .flight-row-list {
      display: flex;
      flex-direction: column;
      gap: var(--sp-2);
    }
    .flight-row {
      display: flex;
      align-items: center;
      gap: var(--sp-3);
      min-height: 68px;
      padding: var(--sp-2) var(--sp-3);
      background: var(--md-surface);
      border: 1px solid var(--md-outline);
      border-radius: var(--r-lg);
      cursor: pointer;
      box-shadow: var(--elev-1);
      transition: transform 0.12s ease, border-color 0.15s ease, background-color 0.15s ease;
      -webkit-tap-highlight-color: transparent;
      animation: cardFadeSlideIn 0.22s cubic-bezier(0.16, 1, 0.3, 1) both;
    }
    .flight-row:hover {
      border-color: var(--md-primary);
      background: var(--md-surface-low);
    }
    .flight-row:active {
      transform: scale(0.985);
    }
    .flight-row.tentative-row {
      border-style: dashed;
      border-color: var(--md-tentative-fg);
      background: var(--md-tentative-bg);
      opacity: 0.95;
    }
    body.dark-mode .flight-row.tentative-row {
      background: rgba(92, 58, 10, 0.28);
    }

    /* Time column */
    .flight-time-col {
      flex: none;
      min-width: 80px;
      text-align: left;
    }
    .flight-time-main {
      font-size: var(--fs-title);
      font-weight: 800;
      line-height: 1.1;
      letter-spacing: -0.02em;
    }
    .flight-tz-label {
      font-size: var(--fs-xs);
      font-weight: 700;
      color: var(--md-text-muted);
    }
    .flight-date-label {
      font-size: 11px;
      font-weight: 700;
      color: var(--md-text-muted);
      margin-top: 1px;
    }

    /* Main body column */
    .flight-main-col {
      flex: 1;
      min-width: 0;
      display: flex;
      flex-direction: column;
      gap: 2px;
    }
    .flight-route-title {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: var(--fs-body);
      font-weight: 700;
      line-height: 1.25;
      flex-wrap: wrap;
    }
    .flight-route-codes {
      font-family: var(--font-mono);
      font-weight: 800;
      letter-spacing: 0.02em;
    }
    .flight-sub-line {
      font-size: var(--fs-xs);
      color: var(--md-text-muted);
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    /* Avatar stack */
    .avatar-stack {
      display: inline-flex;
      align-items: center;
      margin-right: 2px;
    }
    .avatar-stack .avatar-dot {
      margin-left: -6px;
      box-shadow: 0 0 0 1.5px var(--md-surface);
    }
    .avatar-stack .avatar-dot:first-child {
      margin-left: 0;
    }

    /* Badges in row */
    .flight-badge-wrap {
      display: flex;
      align-items: center;
      gap: 4px;
      flex-wrap: wrap;
      margin-top: 2px;
    }
    .badge-chip {
      font-size: 11px;
      font-weight: 700;
      padding: 1px 7px;
      border-radius: var(--r-sm);
      background: var(--md-surface-mid);
      color: var(--md-text-muted);
      display: inline-flex;
      align-items: center;
      gap: 3px;
    }
    .badge-chip.warn {
      background: var(--md-warn-bg);
      color: var(--md-warn-fg);
      font-weight: 800;
    }
    .badge-chip.tentative {
      background: var(--md-tentative-bg);
      color: var(--md-tentative-fg);
      border: 1px dashed rgba(255, 180, 0, 0.4);
    }
    .badge-chip.diff-airport {
      background: var(--md-secondary-container);
      color: var(--md-on-secondary-container);
    }

    /* Flight Detail Timeline */
    .timeline-container {
      position: relative;
      padding: var(--sp-2) 0;
    }
    .timeline-leg {
      position: relative;
      margin-bottom: var(--sp-4);
      background: var(--md-surface-low);
      border-radius: var(--r-lg);
      padding: var(--sp-4);
      border: 1px solid var(--md-outline);
    }
    .timeline-point {
      display: flex;
      align-items: flex-start;
      gap: var(--sp-3);
    }
    .timeline-time-col {
      min-width: 80px;
      flex: none;
    }
    .timeline-time {
      font-size: var(--fs-title);
      font-weight: 800;
      line-height: 1.1;
    }
    .timeline-tz {
      font-size: var(--fs-xs);
      font-weight: 700;
      color: var(--md-text-muted);
    }
    .timeline-place-col {
      flex: 1;
      min-width: 0;
    }
    .timeline-airport-code {
      font-family: var(--font-mono);
      font-size: var(--fs-title);
      font-weight: 800;
      color: var(--md-primary);
    }
    .timeline-airport-city {
      font-size: var(--fs-sm);
      font-weight: 600;
      color: var(--md-text);
    }
    .timeline-term {
      font-size: var(--fs-xs);
      color: var(--md-text-muted);
      margin-top: 2px;
    }
    .timeline-segment-box {
      margin: var(--sp-3) 0 var(--sp-3) 92px;
      padding-left: var(--sp-3);
      border-left: 2px dashed var(--md-outline);
      display: flex;
      flex-direction: column;
      gap: 4px;
      font-size: var(--fs-sm);
    }
    @media (max-width: 480px) {
      .timeline-segment-box { margin-left: 10px; }
    }
    .timeline-flight-num {
      font-family: var(--font-mono);
      font-weight: 800;
      font-size: var(--fs-sm);
    }
    .timeline-copyable {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      cursor: pointer;
      font-family: var(--font-mono);
      font-weight: 700;
      background: var(--md-surface);
      border: 1px solid var(--md-outline);
      border-radius: var(--r-sm);
      padding: 2px 7px;
      font-size: var(--fs-xs);
      width: fit-content;
    }
    .timeline-copyable:hover {
      background: var(--md-primary-container);
      color: var(--md-on-primary-container);
    }

    /* Layover alert card in timeline */
    .timeline-layover {
      display: flex;
      align-items: center;
      gap: var(--sp-2);
      padding: var(--sp-2) var(--sp-3);
      border-radius: var(--r-md);
      background: var(--md-surface-mid);
      font-size: var(--fs-sm);
      font-weight: 700;
      margin: calc(var(--sp-2) * -1) 0 var(--sp-3) 0;
    }
    .timeline-layover.warn {
      background: var(--md-warn-bg);
      color: var(--md-warn-fg);
      border: 1px solid rgba(180, 90, 0, 0.3);
    }

    /* Section sticky headers for All Flights view */
    .section-sticky-header {
      position: sticky;
      top: 96px;
      z-index: 20;
      background: var(--md-bg);
      padding: var(--sp-2) 0;
      margin: var(--sp-3) 0 var(--sp-2);
      border-bottom: 1px solid var(--md-outline);
      font-size: var(--fs-title);
      font-weight: 800;
      display: flex;
      justify-content: space-between;
      align-items: baseline;
    }

    /* ---- Home Dashboard (HomeScreen, WaveCard, InTownTimeline, NeedsAttentionList, StatChips) ---- */
    .home-stack {
      display: flex;
      flex-direction: column;
      gap: var(--sp-4);
      padding-bottom: var(--sp-6);
    }
    .home-section-card {
      background: var(--md-surface);
      border: 1px solid var(--md-outline);
      border-radius: var(--r-xl);
      padding: var(--sp-4);
      box-shadow: var(--elev-1);
      min-width: 0;
      max-width: 100%;
    }
    .home-section-head {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: var(--sp-2);
      margin-bottom: var(--sp-3);
    }
    .home-section-title {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: var(--fs-title);
      font-weight: 800;
      color: var(--md-text);
      margin: 0;
    }
    .home-section-title .icon {
      font-size: 20px;
      color: var(--md-primary);
    }
    .home-section-sub {
      font-size: var(--fs-xs);
      font-weight: 700;
      color: var(--md-text-muted);
    }
    .who-prompt-card {
      display: inline-flex;
      align-items: center;
      justify-content: space-between;
      gap: var(--sp-2);
      padding: var(--sp-2) var(--sp-3);
      background: var(--md-surface);
      color: var(--md-text);
      border: 1px solid var(--md-outline);
      border-radius: var(--r-full);
      cursor: pointer;
      min-height: 48px;
      font-size: var(--fs-sm);
      font-weight: 700;
      box-shadow: var(--elev-1);
      transition: transform 0.12s ease, border-color 0.15s ease;
      align-self: flex-start;
    }
    .who-prompt-card:hover {
      border-color: var(--md-primary);
      background: var(--md-surface-low);
    }
    .who-prompt-card:active {
      transform: scale(0.985);
    }
    .me-hero-card.me-hero-collapsed {
      padding: var(--sp-2) var(--sp-3);
      min-height: 48px;
      display: flex;
      align-items: center;
    }
    .me-collapsed-row {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
      width: 100%;
      font-size: var(--fs-sm);
      color: var(--md-text-muted);
    }
    .me-switch-inline-btn {
      background: none;
      border: none;
      padding: 6px 4px;
      min-height: 36px;
      color: var(--md-primary);
      font-family: inherit;
      font-size: var(--fs-sm);
      font-weight: 800;
      cursor: pointer;
      text-decoration: underline;
      text-underline-offset: 2px;
    }
    .cluster-pill-btn {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      min-height: 36px;
      padding: 0 10px;
      border-radius: var(--r-full);
      border: 1px solid var(--md-outline);
      background: var(--md-surface-low);
      color: var(--md-text-muted);
      font-family: inherit;
      font-size: var(--fs-xs);
      font-weight: 700;
      cursor: pointer;
    }
    .cluster-pill-btn:hover {
      border-color: var(--md-primary);
      color: var(--md-text);
    }
    .wave-seg-tablist, .wave-seg-bar {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2px;
      padding: 3px;
      border-radius: 9px;
      background: rgba(118, 118, 128, 0.12);
      box-shadow: inset 0 0.5px 1px rgba(0, 0, 0, 0.08);
      margin-bottom: var(--sp-3);
    }
    body.dark-mode .wave-seg-tablist, body.dark-mode .wave-seg-bar {
      background: rgba(118, 118, 128, 0.24);
      box-shadow: inset 0 0.5px 1px rgba(0, 0, 0, 0.25);
    }
    .wave-seg-tab, .wave-seg-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      min-height: 36px;
      padding: 0 12px;
      border-radius: 7px;
      border: none;
      background: transparent;
      color: var(--md-text-muted);
      font-family: inherit;
      font-size: var(--fs-sm);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.18s cubic-bezier(0.32, 0.72, 0, 1);
    }
    .wave-seg-tab:hover, .wave-seg-btn:hover {
      color: var(--md-text);
    }
    .wave-seg-tab[aria-selected="true"], .wave-seg-btn.active, .wave-seg-btn[aria-selected="true"] {
      background: #FFFFFF;
      color: #000000;
      font-weight: 700;
      box-shadow: 0 3px 8px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.06);
    }
    body.dark-mode .wave-seg-tab[aria-selected="true"],
    body.dark-mode .wave-seg-btn.active,
    body.dark-mode .wave-seg-btn[aria-selected="true"] {
      background: #636366;
      color: #FFFFFF;
      box-shadow: 0 3px 8px rgba(0, 0, 0, 0.35);
    }
    .seg-count-badge, .wave-seg-badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-width: 18px;
      height: 18px;
      padding: 0 5px;
      border-radius: var(--r-full);
      background: var(--md-primary-container);
      color: var(--md-on-primary-container);
      font-size: 11px;
      font-weight: 700;
      line-height: 1;
    }
    .wave-day-subhead {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: var(--fs-xs);
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--md-text-muted);
      margin: var(--sp-3) 0 var(--sp-2);
      padding-bottom: 4px;
      border-bottom: 0.5px solid var(--md-outline);
    }
    .wave-day-subhead:first-of-type {
      margin-top: 0;
    }
    .wave-card {
      display: flex;
      flex-direction: column;
      gap: 6px;
      padding: var(--sp-3);
      margin-bottom: var(--sp-2);
      background: var(--md-surface);
      border: 0.5px solid var(--md-outline);
      border-radius: var(--r-lg);
      cursor: pointer;
      box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
      transition: transform 0.12s ease, border-color 0.15s ease, background-color 0.15s ease;
      min-height: 64px;
    }
      transition: transform 0.12s ease, border-color 0.15s ease, background-color 0.15s ease;
      min-height: 64px;
    }
    .wave-card:last-child {
      margin-bottom: 0;
    }
    .wave-card:hover {
      border-color: var(--md-primary);
    }
    .wave-card:active {
      transform: scale(0.985);
    }
    .wave-top {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: var(--sp-2);
      flex-wrap: wrap;
    }
    .wave-time-range {
      font-size: 16px;
      font-weight: 800;
      color: var(--md-text);
    }
    .wave-leave-pill {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      padding: 4px 10px;
      border-radius: var(--r-full);
      background: var(--md-primary-container);
      color: var(--md-on-primary-container);
      font-size: var(--fs-xs);
      font-weight: 800;
    }
    .wave-people-row {
      display: flex;
      align-items: center;
      gap: 6px;
      flex-wrap: wrap;
    }
    .wave-person-chip {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      padding: 2px 8px 2px 4px;
      border-radius: var(--r-full);
      background: var(--md-surface);
      border: 1px solid var(--md-outline);
      font-size: var(--fs-xs);
      font-weight: 600;
      color: var(--md-text);
    }
    .wave-person-chip.wave-overflow-chip {
      padding: 2px 8px;
      background: var(--md-surface-mid);
      font-weight: 800;
    }
    .wave-meta-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: var(--sp-2);
      font-size: var(--fs-xs);
      color: var(--md-text-muted);
      margin-top: 2px;
    }
    .wave-stops-indicator {
      display: inline-flex;
      align-items: center;
      gap: 3px;
      font-size: 11px;
      font-weight: 700;
      color: var(--md-text-muted);
    }
    .wave-show-all-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      width: 100%;
      min-height: 40px;
      margin-top: 4px;
      padding: 6px 12px;
      border-radius: var(--r-md);
      border: 1px dashed var(--md-outline);
      background: transparent;
      color: var(--md-primary);
      font-family: inherit;
      font-size: var(--fs-xs);
      font-weight: 800;
      cursor: pointer;
    }
    .wave-show-all-btn:hover {
      background: var(--md-surface-low);
      border-color: var(--md-primary);
    }
    /* Presence Gantt Timeline (Stage d) */
    .everyone-banner {
      display: flex;
      align-items: center;
      gap: var(--sp-2);
      padding: var(--sp-2) var(--sp-3);
      margin-bottom: var(--sp-3);
      border-radius: var(--r-md);
      background: var(--md-primary-container);
      color: var(--md-on-primary-container);
      font-size: var(--fs-xs);
      font-weight: 700;
      line-height: 1.35;
    }
    .gantt-scroll-wrap {
      overflow-x: auto;
      padding-bottom: 4px;
      scrollbar-width: thin;
      border: 1px solid var(--md-outline);
      border-radius: var(--r-lg);
      background: var(--md-surface-low);
    }
    .gantt-table {
      display: flex;
      flex-direction: column;
      min-width: 100%;
      width: max-content;
    }
    .gantt-header-row,
    .gantt-person-row {
      display: flex;
      align-items: stretch;
      min-width: 100%;
    }
    .gantt-header-row {
      border-bottom: 1px solid var(--md-outline);
      background: var(--md-surface);
    }
    .gantt-person-row {
      min-height: 32px;
      border-bottom: 1px solid rgba(128, 128, 128, 0.12);
    }
    .gantt-person-row:last-child {
      border-bottom: none;
    }
    .gantt-name-col {
      position: sticky;
      left: 0;
      z-index: 3;
      width: 96px;
      min-width: 96px;
      max-width: 96px;
      padding: 4px 8px;
      display: flex;
      align-items: center;
      gap: 6px;
      background: var(--md-surface);
      border-right: 0.5px solid var(--md-outline);
      font-size: 12px;
      font-weight: 700;
      color: var(--md-text);
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }
    .gantt-days-header {
      display: flex;
      flex: 1;
    }
    .gantt-day-col-btn {
      flex: 1 0 46px;
      min-width: 46px;
      min-height: 44px;
      padding: 4px 2px;
      border: none;
      border-right: 0.5px dashed rgba(128, 128, 128, 0.2);
      background: transparent;
      color: var(--md-text);
      font-family: inherit;
      font-size: 11px;
      font-weight: 800;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 1px;
      cursor: pointer;
    }
    .gantt-day-col-btn:last-child {
      border-right: none;
    }
    .gantt-day-col-btn:hover {
      background: var(--md-primary-container);
      color: var(--md-on-primary-container);
    }
    .gantt-track-area {
      position: relative;
      flex: 1;
      display: flex;
      align-items: center;
      min-height: 32px;
    }
    .gantt-grid-lines {
      position: absolute;
      inset: 0;
      display: flex;
      pointer-events: none;
    }
    .gantt-grid-cell {
      flex: 1 0 46px;
      min-width: 46px;
      border-right: 0.5px dashed rgba(128, 128, 128, 0.16);
    }
    .gantt-grid-cell:last-child {
      border-right: none;
    }
    .gantt-everyone-band {
      position: absolute;
      top: 0;
      bottom: 0;
      background: var(--md-primary-container);
      opacity: 0.55;
      border-left: 1px solid var(--md-primary);
      border-right: 1px solid var(--md-primary);
      pointer-events: none;
      z-index: 1;
    }
    .gantt-bar-btn {
      position: absolute;
      top: 6px;
      bottom: 6px;
      min-height: 20px;
      border-radius: var(--r-full);
      background: var(--md-primary);
      color: #FFFFFF;
      border: none;
      padding: 0 4px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      z-index: 2;
      box-shadow: 0 1px 3px rgba(255, 128, 0, 0.40);
      transition: transform 0.1s ease, filter 0.12s ease;
    }
    .gantt-bar-btn:hover {
      filter: brightness(1.08);
    }
    .gantt-bar-marker {
      width: 5px;
      height: 5px;
      border-radius: 50%;
      background: #FFFFFF;
      opacity: 0.95;
      flex-shrink: 0;
    }
    .gantt-unscheduled-bar {
      position: relative;
      z-index: 2;
      margin: 0 8px;
      width: 100%;
      height: 20px;
      border-radius: var(--r-full);
      border: 0.5px dashed var(--md-outline);
      background: var(--md-surface);
      color: var(--md-text-muted);
      font-size: 11px;
      font-weight: 600;
      display: flex;
      align-items: center;
      padding: 0 10px;
    }
    /* Prominent Flight Direction Selector in Add/Edit Flight Modal (Apple HIG Style) */
    .flight-dir-selector {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      margin-bottom: 10px;
    }
    .flight-dir-option {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 12px 14px;
      border-radius: 14px;
      border: 1px solid var(--md-outline);
      background: var(--md-surface-low);
      color: var(--md-text-muted);
      font-family: inherit;
      text-align: left;
      cursor: pointer;
      transition: all 0.15s ease;
    }
    .flight-dir-option:hover {
      border-color: var(--md-primary);
      color: var(--md-text);
    }
    .flight-dir-option.active-arr {
      border-color: var(--md-primary);
      background: var(--md-primary-container);
      color: var(--md-on-primary-container);
      box-shadow: 0 2px 8px rgba(255, 128, 0, 0.25);
    }
    .flight-dir-option.active-dep {
      border-color: var(--md-tertiary);
      background: var(--md-tentative-bg);
      color: var(--md-tentative-fg);
      box-shadow: 0 2px 8px rgba(255, 149, 0, 0.25);
    }
    .flight-dir-option-icon {
      width: 36px;
      height: 36px;
      border-radius: 10px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: rgba(128, 128, 128, 0.14);
      flex-shrink: 0;
    }
    .flight-dir-option.active-arr .flight-dir-option-icon {
      background: var(--md-primary);
      color: var(--md-on-primary);
    }
    .flight-dir-option.active-dep .flight-dir-option-icon {
      background: var(--md-tentative-fg);
      color: var(--md-surface);
    }
    .flight-dir-option-title {
      font-size: 13.5px;
      font-weight: 800;
      line-height: 1.2;
      display: block;
    }
    .flight-dir-option-sub {
      font-size: 11px;
      font-weight: 600;
      opacity: 0.85;
      display: block;
      margin-top: 2px;
    }
    @media (max-width: 520px) {
      .flight-dir-selector {
        grid-template-columns: 1fr;
      }
    }

    /* Crew Tab Clean Arrival / Departure Schedule Rows */
    .crew-flight-schedule {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: 6px;
    }
    .crew-flight-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 10px;
      border-radius: 8px;
      font-size: 11.5px;
      font-weight: 700;
      border: 1px solid var(--md-outline);
      background: var(--md-surface-low);
      color: var(--md-text);
    }
    .crew-flight-pill.arr {
      border-left: 3px solid var(--md-primary);
    }
    .crew-flight-pill.dep {
      border-left: 3px solid var(--md-tertiary);
    }
    .crew-flight-pill.muted {
      color: var(--md-text-muted);
      font-weight: 600;
      border-style: dashed;
    }
    .crew-flight-dir {
      font-size: 10px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      padding: 1px 5px;
      border-radius: 4px;
      background: var(--md-surface-mid);
      color: var(--md-text-muted);
    }
    .crew-flight-pill.arr .crew-flight-dir {
      background: var(--md-primary-container);
      color: var(--md-on-primary-container);
    }
    .crew-flight-pill.dep .crew-flight-dir {
      background: var(--md-tentative-bg);
      color: var(--md-tentative-fg);
    }

    /* Conditional Lodging Banner (Apple Notification Style) */
    .lodging-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: var(--sp-3);
      min-height: 48px;
      padding: var(--sp-2) var(--sp-3);
      border-radius: var(--r-lg);
      background: rgba(255, 149, 0, 0.12);
      color: #9E5A00;
      border: 0.5px solid rgba(255, 149, 0, 0.35);
      cursor: pointer;
      transition: transform 0.12s ease, border-color 0.15s ease;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
    }
    body.dark-mode .lodging-banner {
      background: rgba(255, 159, 10, 0.18);
      color: #FFB366;
      border-color: rgba(255, 159, 10, 0.40);
    }
    .lodging-banner:hover {
      border-color: var(--md-primary);
    }
    .lodging-banner:active {
      transform: scale(0.99);
    }
    .lodging-banner-main {
      display: flex;
      align-items: center;
      gap: var(--sp-2);
      font-size: var(--fs-sm);
      font-weight: 700;
      min-width: 0;
      flex: 1;
    }
    .lodging-banner-main .icon {
      font-size: 20px;
      flex: none;
      color: #FF9500;
    }
    .lodging-banner-cta {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      min-height: 32px;
      padding: 0 12px;
      border-radius: var(--r-full);
      border: 0.5px solid rgba(255, 149, 0, 0.45);
      background: rgba(255, 149, 0, 0.14);
      color: inherit;
      font-family: inherit;
      font-size: var(--fs-xs);
      font-weight: 700;
      white-space: nowrap;
      cursor: pointer;
      flex: none;
      transition: background-color 0.15s ease;
    }
    .lodging-banner-cta:hover {
      background: rgba(255, 149, 0, 0.24);
    }
    .stat-chips-row {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      align-items: center;
    }
    .stat-chip-btn {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      min-height: 40px;
      padding: 0 14px;
      border-radius: var(--r-full);
      border: 0.5px solid var(--md-outline);
      background: var(--md-surface);
      color: var(--md-text);
      font-size: var(--fs-sm);
      font-weight: 600;
      cursor: pointer;
      box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
      transition: all 0.15s ease;
    }
    .stat-chip-btn:hover {
      border-color: var(--md-primary);
      background: var(--md-surface-low);
    }
    .stat-chip-btn:active {
      transform: scale(0.96);
    }
    .stat-chip-btn.tentative-stat {
      background: var(--md-tentative-bg);
      color: var(--md-tentative-fg);
      border-color: rgba(255, 149, 0, 0.35);
    }
    @keyframes wavePulse {
      0% { box-shadow: 0 0 0 0 var(--md-primary); border-color: var(--md-primary); }
      50% { box-shadow: 0 0 0 4px var(--md-primary-container); border-color: var(--md-primary); background: var(--md-primary-container); }
      100% { box-shadow: var(--elev-1); }
    }
    .wave-highlight-pulse {
      animation: wavePulse 1.8s ease-out;
    }

    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after {
        transition-duration: 0.001ms !important;
        animation-duration: 0.001ms !important;
        scroll-behavior: auto !important;
      }
    }