@layer m1-foundation {
  :root {
    --m1-canvas: #f5f4ef;
    --m1-surface: #ffffff;
    --m1-surface-soft: #fbfaf7;
    --m1-surface-strong: #f0ede7;
    --m1-ink: #121927;
    --m1-ink-muted: #626a76;
    --m1-ink-subtle: #8a94a3;
    --m1-navy: #0b1320;
    --m1-navy-soft: #162235;
    --m1-business-accent: #8ea8c3;
    --m1-business-accent-strong: #4f6d88;
    --m1-business-accent-soft: #eaf0f5;
    --m1-business-accent-border: #c8d5e1;
    --m1-border: #e7e3db;
    --m1-border-strong: #cec8bc;
    --m1-success: #16745b;
    --m1-success-soft: #e8f5ef;
    --m1-warning: #8a5b13;
    --m1-warning-soft: #fbf4df;
    --m1-danger: #a13b3b;
    --m1-danger-soft: #fbecec;
    --m1-info: #265f91;
    --m1-info-soft: #eaf3fa;
    --m1-focus: #4f6d88;
    --m1-shadow-sm: 0 1px 2px rgba(16, 24, 39, .035), 0 10px 30px rgba(16, 24, 39, .045);
    --m1-shadow-md: 0 24px 64px rgba(9, 17, 31, .11);
    --m1-radius-sm: 8px;
    --m1-radius-md: 12px;
    --m1-radius-lg: 18px;
    --m1-content: 1180px;
    --m1-reading: 760px;
    --m1-space-1: .25rem;
    --m1-space-2: .5rem;
    --m1-space-3: .75rem;
    --m1-space-4: 1rem;
    --m1-space-5: 1.25rem;
    --m1-space-6: 1.5rem;
    --m1-space-8: 2rem;
    --m1-space-10: 2.5rem;
    --m1-space-12: 3rem;

    /* Dark-surface button contract: any surface that overrides --m1-ink to a
       light color (e.g. .guest-help, .driver-completion) must also override
       these so .button/.button--secondary/.button--quiet/.button--danger
       stay visible against that dark background instead of inheriting
       light-surface button colors meant for the canvas. */
    --m1-button-primary-bg: var(--m1-navy);
    --m1-button-primary-border: transparent;
    --m1-button-primary-text: #fff;
    --m1-button-secondary-bg: var(--m1-surface);
    --m1-button-secondary-border: var(--m1-border);
    --m1-button-secondary-text: var(--m1-ink);
    --m1-button-quiet-text: var(--m1-ink-muted);
    --m1-button-danger-border: #e6b9b9;
    --m1-button-danger-text: var(--m1-danger);

    /* Semantic component aliases keep page modules independent of palette names. */
    --color-text: var(--m1-ink);
    --color-text-muted: var(--m1-ink-muted);
    --color-navy: var(--m1-navy);
    --color-surface: var(--m1-surface);
    --color-surface-subtle: var(--m1-surface-soft);
    --color-border: var(--m1-border);
    --color-border-strong: var(--m1-border-strong);
    --color-accent: var(--m1-business-accent);
    --color-accent-strong: var(--m1-business-accent-strong);
    --color-accent-light: var(--m1-business-accent);
    --color-accent-soft: var(--m1-business-accent-soft);
    --color-accent-border: var(--m1-business-accent-border);
    --color-success-soft: var(--m1-success-soft);
    --color-success-text: var(--m1-success);
    --color-success-border: #9fcfbe;
    --color-warning: var(--m1-warning);
    --color-warning-soft: var(--m1-warning-soft);
    --color-warning-text: var(--m1-warning);
    --color-warning-border: #dec78a;
    --color-danger-soft: var(--m1-danger-soft);
    --color-danger-text: var(--m1-danger);
    --color-danger-border: #e3b0b0;
    --color-info: var(--m1-info);
    --color-info-soft: var(--m1-info-soft);
    --color-info-text: var(--m1-info);
    --color-info-border: #b4d0e5;
    --shadow-xs: 0 1px 2px rgba(16, 24, 39, .05);
    --shadow-sm: var(--m1-shadow-sm);
    --font-display: ui-serif, Georgia, "Times New Roman", serif;
  }

  *, *::before, *::after { box-sizing: border-box; }

  html { color-scheme: light; background: var(--m1-canvas); }

  body.m1-app {
    min-width: 0;
    margin: 0;
    color: var(--m1-ink);
    background: var(--m1-canvas);
    font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
  }

  body.m1-app.has-open-menu { overflow: hidden; }

  body.m1-app main {
    display: block;
    width: 100%;
    min-height: calc(100vh - 72px);
  }

  body.m1-app h1,
  body.m1-app h2,
  body.m1-app h3,
  body.m1-app h4,
  body.m1-app p { margin-top: 0; }

  body.m1-app h1,
  body.m1-app h2,
  body.m1-app h3,
  body.m1-app h4 {
    color: var(--m1-ink);
    font-weight: 650;
    letter-spacing: -.028em;
    line-height: 1.15;
  }

  body.m1-app a { color: inherit; text-underline-offset: .18em; }
  body.m1-app img, body.m1-app svg { display: block; max-width: 100%; }
  body.m1-app button, body.m1-app input, body.m1-app select, body.m1-app textarea { font: inherit; }

  .m1-dialog { width: min(calc(100% - 2rem), 30rem); padding: 0; color: var(--m1-ink); border: 1px solid var(--m1-border); border-radius: var(--m1-radius-md); box-shadow: var(--m1-shadow-md); }
  .m1-dialog::backdrop { background: rgba(10, 17, 29, .62); backdrop-filter: blur(2px); }
  .m1-dialog__panel { padding: 1.75rem; }
  .m1-dialog h2 { margin: .35rem 0 .65rem; font-size: 1.55rem; }
  .m1-dialog p { margin: 0; color: var(--m1-ink-muted); }
  .m1-dialog__actions { display: flex; justify-content: flex-end; gap: .6rem; margin-top: 1.5rem; }

  .page-shell {
    width: min(100% - 40px, var(--m1-content));
    margin-inline: auto;
    padding-block: 52px 84px;
  }

  .page-shell--narrow { max-width: var(--m1-reading); }

  .page-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--m1-space-6);
    margin-bottom: var(--m1-space-10);
  }

  .page-header__copy { min-width: 0; }
  .page-header__eyebrow, .eyebrow {
    display: block;
    margin-bottom: .45rem;
    color: var(--m1-business-accent-strong);
    font-size: .75rem;
    font-weight: 720;
    letter-spacing: .135em;
    text-transform: uppercase;
  }

  .page-header h1 { margin-bottom: .45rem; font-size: clamp(2rem, 4vw, 3.15rem); }
  .page-header p { max-width: 720px; margin-bottom: 0; color: var(--m1-ink-muted); }
  .page-header__actions { display: flex; flex: none; flex-wrap: wrap; gap: .65rem; }

  .button, body.m1-app .btn {
    display: inline-flex;
    min-height: 46px;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    padding: .72rem 1.05rem;
    border: 1px solid var(--m1-button-primary-border);
    border-radius: var(--m1-radius-sm);
    background: var(--m1-button-primary-bg);
    color: var(--m1-button-primary-text);
    font-size: .9rem;
    font-weight: 700;
    line-height: 1.2;
    text-decoration: none;
    cursor: pointer;
    transition: background-color .16s ease, border-color .16s ease, color .16s ease, transform .16s ease;
  }

  .button:hover, body.m1-app .btn:hover { background: var(--m1-navy-soft); transform: translateY(-1px); }
  .button:disabled, body.m1-app .btn:disabled { cursor: not-allowed; opacity: .58; transform: none; }
  .button--secondary, body.m1-app .btn-secondary { border-color: var(--m1-button-secondary-border); background: var(--m1-button-secondary-bg); color: var(--m1-button-secondary-text); }
  .button--secondary:hover, body.m1-app .btn-secondary:hover { border-color: var(--m1-border-strong); background: var(--m1-surface-soft); }
  .button--success { background: var(--m1-success); border-color: var(--m1-success); color: #fff; }
  .button--success:hover { background: #105d48; border-color: #105d48; }
  .button--danger { border-color: var(--m1-button-danger-border); background: var(--m1-button-secondary-bg); color: var(--m1-button-danger-text); }
  .button--danger:hover { background: var(--m1-danger-soft); }
  .button--quiet { border-color: transparent; background: transparent; color: var(--m1-button-quiet-text); }
  .button--small { min-height: 40px; padding: .52rem .85rem; font-size: .84rem; }
  .button--wide { width: 100%; }

  /* Link buttons must keep the component color instead of inheriting anchor text. */
  body.m1-app a.button { color: var(--m1-button-primary-text); }
  body.m1-app a.button--secondary { color: var(--m1-button-secondary-text); }
  body.m1-app a.button--success { color: #fff; }
  body.m1-app a.button--danger { color: var(--m1-button-danger-text); }
  body.m1-app a.button--quiet { color: var(--m1-button-quiet-text); }

  .icon-button {
    display: inline-grid;
    width: 44px;
    height: 44px;
    place-items: center;
    padding: 0;
    border: 1px solid var(--m1-border);
    border-radius: var(--m1-radius-sm);
    background: var(--m1-surface);
    color: var(--m1-ink);
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
  }

  .surface {
    border: 1px solid var(--m1-border);
    border-radius: var(--m1-radius-md);
    background: var(--m1-surface);
    box-shadow: var(--m1-shadow-sm);
  }

  .surface--flat { box-shadow: none; }
  .surface__header { padding: 1.55rem 1.65rem; border-bottom: 1px solid var(--m1-border); }
  .surface__header h2, .surface__header h3 { margin-bottom: .3rem; }
  .surface__header p { margin-bottom: 0; color: var(--m1-ink-muted); }
  .surface__body { padding: 1.65rem; }

  .status-badge, body.m1-app .badge {
    display: inline-flex;
    min-height: 26px;
    align-items: center;
    gap: .35rem;
    padding: .25rem .55rem;
    border: 1px solid var(--m1-border);
    border-radius: 999px;
    background: var(--m1-surface-strong);
    color: var(--m1-ink-muted);
    font-size: .75rem;
    font-weight: 700;
    line-height: 1;
    white-space: nowrap;
  }

  .status-badge::before, body.m1-app .badge::before {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
    content: "";
  }

  .status-badge--pending, .badge-pending { border-color: #e8d49d; background: var(--m1-warning-soft); color: var(--m1-warning); }
  .status-badge--confirmed, .badge-confirmed { border-color: #acd4c3; background: var(--m1-success-soft); color: var(--m1-success); }
  .status-badge--cancelled, .badge-cancelled, .badge-cancelled_full_charge { border-color: #e6b9b9; background: var(--m1-danger-soft); color: var(--m1-danger); }
  .status-badge--trip_completed, .badge-trip_completed { border-color: #b8c9dc; background: var(--m1-info-soft); color: var(--m1-info); }

  .alert {
    display: flex;
    align-items: flex-start;
    gap: .7rem;
    padding: .9rem 1rem;
    border: 1px solid var(--m1-border);
    border-radius: var(--m1-radius-sm);
    background: var(--m1-surface-soft);
    color: var(--m1-ink);
  }
  .alert p:last-child { margin-bottom: 0; }
  .alert--info, .alert-info { border-color: #b9d5e8; background: var(--m1-info-soft); color: #1d4f77; }
  .alert--warning, .alert-warning { border-color: #e8d49d; background: var(--m1-warning-soft); color: #6f470d; }
  .alert--success, .alert-success { border-color: #acd4c3; background: var(--m1-success-soft); color: #0f5f48; }
  .alert--danger, .alert-danger { border-color: #e6b9b9; background: var(--m1-danger-soft); color: #842d2d; }

  .field { display: grid; gap: .45rem; min-width: 0; }
  .field__label, body.m1-app .form-label { color: var(--m1-ink); font-size: .82rem; font-weight: 700; }
  .field__hint, body.m1-app .form-hint { color: var(--m1-ink-muted); font-size: .78rem; line-height: 1.45; }
  .field__error, body.m1-app .form-error { color: var(--m1-danger); font-size: .8rem; font-weight: 650; }
  .field__status {
    display: block;
    min-block-size: 2.35em;
    color: var(--m1-ink-muted);
    font-size: .78rem;
    line-height: 1.45;
  }
  .field__status.is-error { color: var(--m1-danger); font-weight: 680; }
  .field > .field__hint:has(+ .field__error),
  .location-field > [data-location-hint]:has(+ .field__error) { display: none; }
  .field > .field__error, .location-field > .field__error { min-block-size: 2.35em; line-height: 1.45; }
  .field-grid, body.m1-app .form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.1rem 1.25rem; }
  .field-grid--three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .field--full, body.m1-app .form-grid-full { grid-column: 1 / -1; }

  body.m1-app .form-input,
  body.m1-app .form-select,
  body.m1-app .form-textarea,
  body.m1-app input[type="text"],
  body.m1-app input[type="email"],
  body.m1-app input[type="tel"],
  body.m1-app input[type="number"],
  body.m1-app input[type="password"],
  body.m1-app select,
  body.m1-app textarea,
  body.m1-app .m1-datetime-trigger {
    width: 100%;
    min-width: 0;
    min-height: 46px;
    padding: .7rem .8rem;
    border: 1px solid var(--m1-border-strong);
    border-radius: var(--m1-radius-sm);
    background: var(--m1-surface);
    color: var(--m1-ink);
    box-shadow: none;
  }

  body.m1-app textarea, body.m1-app .form-textarea { min-height: 104px; resize: vertical; }
  body.m1-app input::placeholder, body.m1-app textarea::placeholder { color: #9299a3; opacity: 1; }
  body.m1-app input:hover, body.m1-app select:hover, body.m1-app textarea:hover, body.m1-app .m1-datetime-trigger:hover { border-color: #949eab; }

  body.m1-app :focus-visible {
    outline: 3px solid color-mix(in srgb, var(--m1-focus) 34%, transparent);
    outline-offset: 2px;
  }

  body.m1-app input:focus, body.m1-app select:focus, body.m1-app textarea:focus, body.m1-app .m1-datetime-trigger:focus {
    border-color: var(--m1-focus);
    outline: 3px solid color-mix(in srgb, var(--m1-focus) 18%, transparent);
  }

  .checkbox-row { display: flex; align-items: flex-start; gap: .7rem; }
  .checkbox-row input { flex: none; width: 20px; height: 20px; margin-top: .1rem; accent-color: var(--m1-navy); }
  .checkbox-row strong { display: block; margin-bottom: .15rem; font-size: .88rem; }
  .checkbox-row span { color: var(--m1-ink-muted); font-size: .78rem; }

  .segmented-control {
    display: inline-flex;
    padding: 3px;
    border: 1px solid var(--m1-border);
    border-radius: var(--m1-radius-sm);
    background: var(--m1-surface-strong);
  }
  .segmented-control button {
    min-height: 36px;
    padding: .45rem .75rem;
    border: 0;
    border-radius: calc(var(--m1-radius-sm) - 2px);
    background: transparent;
    color: var(--m1-ink-muted);
    font-size: .82rem;
    font-weight: 740;
    cursor: pointer;
  }
  .segmented-control button.is-active, .segmented-control button[aria-pressed="true"] {
    background: var(--m1-surface);
    color: var(--m1-ink);
    box-shadow: 0 1px 4px rgba(16, 24, 39, .12);
  }
  .segmented-control button:disabled { cursor: not-allowed; opacity: .55; }

  .empty-state { padding: 2.5rem 1.5rem; text-align: center; }
  .empty-state h2, .empty-state h3 { margin-bottom: .4rem; }
  .empty-state p { max-width: 520px; margin: 0 auto 1rem; color: var(--m1-ink-muted); }

  .data-list { display: grid; margin: 0; }
  .data-list__row { display: grid; grid-template-columns: minmax(130px, .42fr) minmax(0, 1fr); gap: 1rem; padding: .9rem 0; border-bottom: 1px solid var(--m1-border); }
  .data-list__row:last-child { border-bottom: 0; }
  .data-list dt { color: var(--m1-ink-muted); font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; }
  .data-list dd { min-width: 0; margin: 0; overflow-wrap: anywhere; }

  .u-visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
  }

  [hidden] { display: none !important; }


  /* 2026.09.01.3 — shared premium page rhythm beyond the booking funnel. */
  body.m1-app.m1-app--public:not(.booking-form-page--luxury) main { background: var(--m1-canvas); }
  body.m1-app .surface { border-color: var(--m1-border); box-shadow: var(--m1-shadow-sm); }
  body.m1-app .surface--flat { box-shadow: none; }
  body.m1-app .page-header h1 { font-weight: 610; letter-spacing: -.045em; }
  body.m1-app .page-header p { line-height: 1.72; }

  @media (max-width: 760px) {
    .page-shell { width: min(100% - 28px, var(--m1-content)); padding-block: 28px 48px; }
    .page-header { align-items: flex-start; flex-direction: column; gap: 1rem; margin-bottom: 1.4rem; }
    .page-header h1 { font-size: clamp(1.85rem, 10vw, 2.45rem); }
    .page-header__actions { width: 100%; }
    .page-header__actions .button, .page-header__actions .btn { flex: 1 1 auto; }
    .field-grid, .field-grid--three, body.m1-app .form-grid { grid-template-columns: minmax(0, 1fr); }
    .surface__header, .surface__body { padding: 1.1rem; }
    .data-list__row { grid-template-columns: 1fr; gap: .25rem; }
    body.m1-app input, body.m1-app select, body.m1-app textarea { font-size: 16px; }
  }

  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
  }
}

@layer m1-foundation {
  /* Validation stability contract: status/help/error copy always owns reserved
     geometry before interaction, so validation never changes form shape. */
  body.m1-app .form-group > .m1-form-status,
  body.m1-app .field > .m1-form-status,
  body.m1-app .location-field > .m1-form-status,
  body.m1-app .service-choice-field > .m1-form-status {
    min-block-size: var(--m1-status-reserved-block, 2.9em);
    overflow-wrap: anywhere;
  }

  body.m1-app .form-group[aria-invalid="true"] > .m1-form-status,
  body.m1-app .field[aria-invalid="true"] > .m1-form-status,
  body.m1-app .location-field[aria-invalid="true"] > .m1-form-status,
  body.m1-app .service-choice-field[aria-invalid="true"] > .m1-form-status {
    color: var(--m1-danger);
  }

  @media (max-width: 520px) {
    body.m1-app .form-group > .m1-form-status,
    body.m1-app .field > .m1-form-status,
    body.m1-app .location-field > .m1-form-status {
      min-block-size: var(--m1-status-reserved-block, 4.35em);
    }
  }
}