:root {
      color-scheme: light;
      --bg: #ffffff; --surface: #ffffff; --hero: #f0f0f0; --ink: #181818;
      --muted: #707070; --line: #dedede; --soft: #f0f0f0;
      --press: #e5e5e5; --inverse: #fff; --shadow: none;
      --duration: 400ms; --gap: 10px; --radius: 16px;
      --ease: cubic-bezier(.22, .61, .36, 1);
    }
    @media (prefers-color-scheme: dark) {
      :root:not([data-theme="light"]) {
        color-scheme: dark; --bg: #000000; --surface: #000000; --hero: #242424;
        --ink: #f5f5f5; --muted: #a0a0a0; --line: #202020;
        --soft: #242424; --press: #171717; --inverse: #000000;
      }
    }
    :root[data-theme="dark"] {
      color-scheme: dark; --bg: #000000; --surface: #000000; --hero: #242424;
      --ink: #f5f5f5; --muted: #a0a0a0; --line: #202020;
      --soft: #242424; --press: #171717; --inverse: #000000;
    }
    * { box-sizing: border-box; }
    body { margin: 0; background: var(--bg); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; -webkit-font-smoothing: antialiased; }
    button, textarea, select, input { font: inherit; }
    button { -webkit-tap-highlight-color: transparent; cursor: pointer; }
    button, select { touch-action: manipulation; }
    button:focus-visible, summary:focus-visible, textarea:focus-visible, select:focus-visible, input:focus-visible { outline: 2px solid var(--ink); outline-offset: 4px; }
    button:disabled { cursor: default; }
    svg { display: block; }
    [hidden] { display: none !important; }
    .page { width: min(calc(100% - 8px), 484px); margin: 4px auto; padding: max(20px, env(safe-area-inset-top)) 16px max(18px, env(safe-area-inset-bottom)); border: 1px solid var(--line); border-radius: 28px; }
    .page-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 24px; margin-bottom: 24px; }
    .page-brand { display: flex; align-items: center; gap: 12px; font-size: 16px; font-weight: 500; }
    .page-brand svg { width: 23px; height: 23px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
    .page-caption { color: var(--muted); font-size: 12px; white-space: nowrap; }
    .hero { min-height: 200px; padding: 28px 26px 22px; background: var(--hero); border: 0; border-radius: 22px; text-align: center; display: flex; flex-direction: column; align-items: center; justify-content: center; }
    .car-stage { margin-bottom: 20px; color: var(--muted); }
    .car { width: 38px; height: 38px; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
    h1 { margin: 0 0 14px; font-size: clamp(20px, 5vw, 22px); line-height: 1.5; font-weight: 650; letter-spacing: -.2px; }
    .intro { max-width: 360px; margin: 0; font-size: 14px; line-height: 1.9; color: var(--muted); text-wrap: pretty; }
    .actions { display: grid; gap: var(--gap); margin-top: 16px; }
    .card { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); overflow: hidden; box-shadow: var(--shadow); }
    .card-action { width: 100%; min-height: 94px; padding: 16px 18px; display: flex; align-items: center; gap: 18px; text-align: left; color: var(--ink); background: transparent; border: 0; transition: background var(--duration) var(--ease); }
    .card-action:active { background: var(--press); }
    @media (hover: hover) { .card-action:hover:not(:disabled) { background: var(--soft); } }
    .icon { width: 24px; height: 30px; flex: 0 0 24px; display: grid; place-items: center; }
    .icon svg { width: 26px; height: 26px; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
    .copy { flex: 1; min-width: 0; }
    .title { display: block; font-size: 18px; font-weight: 600; line-height: 1.5; letter-spacing: -.2px; }
    .description { display: block; color: var(--muted); font-size: 12px; line-height: 1.7; margin-top: 14px; }
    .chevron { width: 14px; height: 14px; flex: 0 0 14px; fill: none; stroke: var(--muted); stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; transition: transform var(--duration) var(--ease); }
    [aria-expanded="true"] .chevron { transform: rotate(90deg); }
    .spinner { width: 15px; height: 15px; border: 1.5px solid var(--line); border-top-color: var(--ink); border-radius: 50%; animation: spin .75s linear infinite; }
    @keyframes spin { to { transform: rotate(360deg); } }
    .message-reveal { display: grid; grid-template-rows: 0fr; opacity: 0; transition: grid-template-rows var(--duration) var(--ease), opacity var(--duration) var(--ease); }
    .message-reveal.open { grid-template-rows: 1fr; opacity: 1; }
    .message-inner { min-height: 0; overflow: hidden; }
    .message-form { padding: 0 20px 20px; }
    .form-rule { border-top: 1px solid var(--line); padding-top: 18px; }
    label.field-label { display: block; font-size: 13px; font-weight: 550; margin-bottom: 9px; }
    textarea { width: 100%; min-height: 116px; resize: vertical; display: block; padding: 13px; color: var(--ink); background: var(--soft); border: 1px solid transparent; border-radius: 12px; font-size: 14px; line-height: 1.7; }
    textarea::placeholder { color: var(--muted); opacity: .8; }
    #message-content { min-height: 160px; }
    .field-meta { display: flex; justify-content: space-between; gap: 12px; margin: 8px 0 16px; color: var(--muted); font-size: 11px; line-height: 1.6; }
    .primary { width: 100%; border: 0; border-radius: 12px; background: var(--ink); color: var(--inverse); padding: 13px 18px; min-height: 46px; font-size: 14px; font-weight: 550; transition: opacity var(--duration) var(--ease); }
    .primary:active { opacity: .72; }
    .primary:disabled { opacity: .55; }
    .form-status { margin: 12px 0 0; font-size: 12px; line-height: 1.7; }
    .notify-status { margin: 0; padding: 0 20px 18px; color: var(--muted); font-size: 12px; line-height: 1.7; }
    .call-card { min-height: 96px; }
    .call-front { transition: opacity var(--duration) var(--ease); }
    .call-front.leaving { opacity: 0; pointer-events: none; }
    .call-back { padding: 22px 20px; animation: fade-in var(--duration) var(--ease); }
    @keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
    .call-back h2 { font-size: 16px; margin: 0 0 8px; line-height: 1.5; font-weight: 600; }
    .call-back p { margin: 0 0 16px; font-size: 13px; line-height: 1.8; color: var(--muted); }
    .secondary { min-height: 44px; padding: 11px 16px; background: var(--soft); border: 1px solid var(--line); border-radius: 11px; color: var(--ink); font-size: 13px; font-weight: 550; transition: background var(--duration) var(--ease); }
    .secondary:active { background: var(--press); }
    .copy-status { display: block; font-size: 11px; color: var(--muted); line-height: 1.7; margin-top: 12px; }
    .preview-note { margin: 22px 0 0; text-align: left; font-size: 13px; color: var(--muted); line-height: 1.9; }
    .preview-note span { display: block; opacity: .8; }
    .lab { display: none; position: fixed; right: 24px; bottom: 24px; width: 248px; z-index: 5; font-size: 12px; }
    .lab-enabled .lab { display: block; }
    .lab summary { list-style: none; width: fit-content; margin-left: auto; padding: 11px 15px; border: 1px solid var(--line); background: var(--surface); border-radius: 12px; cursor: pointer; color: var(--muted); box-shadow: var(--shadow); }
    .lab summary::-webkit-details-marker { display: none; }
    .lab[open] summary { border-radius: 12px 12px 0 0; color: var(--ink); }
    .lab-panel { margin-top: 5px; padding: 18px; background: var(--surface); border: 1px solid var(--line); border-radius: 16px 0 16px 16px; max-height: min(75vh, 600px); overflow: auto; box-shadow: 0 12px 40px rgb(0 0 0 / .08); }
    .lab-panel p { margin: 0 0 18px; font-size: 11px; color: var(--muted); line-height: 1.7; }
    .lab-field { display: grid; gap: 8px; margin-bottom: 17px; }
    .lab-field label { display: flex; justify-content: space-between; gap: 8px; }
    .lab select { width: 100%; min-height: 38px; padding: 6px 8px; color: var(--ink); background: var(--soft); border: 1px solid var(--line); border-radius: 8px; }
    .lab input { width: 100%; accent-color: var(--ink); }
    .lab .secondary { width: 100%; }
    @media (min-width: 700px) { .page { margin-top: 32px; margin-bottom: 32px; } }
    @media (max-width: 699px) { .lab { position: relative; inset: auto; margin: 0 auto 24px; width: min(calc(100% - 44px), 396px); } .lab summary { margin: auto; } .lab-panel { border-radius: 16px; } }
    @media (max-width: 360px) { .page { padding-left: 12px; padding-right: 12px; } .hero { padding-left: 16px; padding-right: 16px; } .card-action { padding-left: 14px; padding-right: 14px; gap: 14px; } .page-caption { font-size: 11px; } }
    @media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; } }