/* 豆图工坊官网 · Warm Pixel Workshop
   与 packages/design-tokens 保持一致：奶油工作台、砖红只用于主动作、紫色只用于编辑态、真实豆色只作数据呈现。 */
@layer reset, tokens, base, layout, components, pages, motion;

@layer reset {
  :where(html) {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
  }
  :where(body, h1, h2, h3, h4, p, ul, ol, dl, dd, figure, blockquote) {
    margin: 0;
  }
  :where(ul, ol) {
    padding: 0;
    list-style: none;
  }
  :where(img, svg) {
    display: block;
    max-inline-size: 100%;
  }
  :where(button) {
    font: inherit;
    color: inherit;
    background: none;
    border: 0;
    padding: 0;
    cursor: pointer;
  }
  :where(a) {
    color: inherit;
    text-decoration: none;
  }
  [hidden] {
    display: none !important;
  }
}

@layer tokens {
  :root {
    color-scheme: light;

    /* Tier 1 · 与 design-tokens 同源 */
    --brand-primary: #c9432f;
    --brand-primary-pressed: #a93626;
    --brand-primary-soft: #fff0eb;
    --accent-purple: #6457d9;
    --accent-purple-soft: #f0eeff;
    --success: #167a64;
    --success-soft: #e7f6f1;
    --warning-soft: #fff3d6;
    --bg-page: #fff8f1;
    --bg-hero: #fff3e6;
    --bg-surface: #fff;
    --bg-subtle: #f7f3ee;
    --text-primary: #24262b;
    --text-secondary: #62666d;
    --text-tertiary: #90959d;
    --border-default: #e5dfd8;
    --divider: #eee9e3;
    --grid-thin: #ddd8d2;
    --grid-strong: #99948e;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-round: 999px;
    --shadow-card: 0 4px 14px rgb(80 52 34 / 0.08);
    --shadow-float: 0 1px 2px rgb(45 31 24 / 0.06), 0 12px 36px rgb(45 31 24 / 0.14);

    --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'HarmonyOS Sans SC',
      'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    --font-mono: ui-monospace, 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;

    /* 8px 节奏 */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --space-7: 48px;
    --space-8: 64px;
    --space-9: 96px;

    --page-max: 1160px;
    --gutter: clamp(20px, 4vw, 40px);

    /* 拼豆板 */
    --board-bg: #fffaf4;
    --peg: #e9e1d7;
    --bead-hole: rgb(255 250 244 / 0.92);
  }
}

@layer base {
  html {
    scroll-behavior: smooth;
    scroll-padding-block-start: 88px;
  }
  @media (prefers-reduced-motion: reduce) {
    html {
      scroll-behavior: auto;
    }
  }
  body {
    min-block-size: 100dvh;
    background: var(--bg-page);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    accent-color: var(--brand-primary);
  }
  ::selection {
    background: var(--brand-primary-soft);
    color: var(--brand-primary-pressed);
  }
  :focus-visible {
    outline: 2px solid var(--brand-primary);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
  }
  h1,
  h2,
  h3 {
    line-height: 1.25;
    text-wrap: balance;
  }
  p {
    text-wrap: pretty;
    overflow-wrap: break-word;
  }
}

@layer layout {
  .container {
    inline-size: min(100% - var(--gutter) * 2, var(--page-max));
    margin-inline: auto;
  }
  .section {
    padding-block: clamp(64px, 8vw, 112px);
  }
  .section-head {
    display: grid;
    gap: var(--space-3);
    max-inline-size: 640px;
    margin-block-end: var(--space-7);
  }
  .skip-link {
    position: absolute;
    inset-inline-start: var(--space-4);
    inset-block-start: -100px;
    z-index: 100;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    background: var(--text-primary);
    color: #fff;
  }
  .skip-link:focus-visible {
    inset-block-start: var(--space-3);
  }
}

@layer components {
  /* ---------- 文字 ---------- */
  .eyebrow {
    color: var(--brand-primary);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.22em;
    text-transform: uppercase;
  }
  .title-display {
    font-size: clamp(2.1rem, 1.3rem + 3vw, 3.5rem);
    font-weight: 800;
    letter-spacing: -0.01em;
    line-height: 1.18;
  }
  .title-section {
    font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.4rem);
    font-weight: 800;
  }
  .lead {
    color: var(--text-secondary);
    font-size: clamp(1rem, 0.95rem + 0.3vw, 1.15rem);
  }
  .muted {
    color: var(--text-secondary);
  }
  .caption {
    color: var(--text-tertiary);
    font-size: 0.8125rem;
  }
  .mono {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
  }

  /* ---------- 按钮 ---------- */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    min-block-size: 48px;
    padding-inline: var(--space-5);
    border: 1px solid transparent;
    border-radius: var(--radius-round);
    font-weight: 700;
    white-space: nowrap;
    transition:
      background-color 0.2s,
      border-color 0.2s,
      translate 0.12s;
  }
  .btn:active {
    translate: 0 1px;
  }
  .btn--primary {
    background: var(--brand-primary);
    color: #fff;
  }
  .btn--primary:hover {
    background: var(--brand-primary-pressed);
  }
  .btn--ghost {
    border-color: var(--border-default);
    background: var(--bg-surface);
  }
  .btn--ghost:hover {
    border-color: var(--grid-strong);
  }
  .btn--sm {
    min-block-size: 40px;
    padding-inline: var(--space-4);
    font-size: 0.9375rem;
  }

  /* ---------- 标签 ---------- */
  .pill {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 2px 10px;
    border-radius: var(--radius-round);
    font-size: 0.75rem;
    font-weight: 700;
    white-space: nowrap;
  }
  .pill--purple {
    background: var(--accent-purple-soft);
    color: var(--accent-purple);
  }
  .pill--green {
    background: var(--success-soft);
    color: var(--success);
  }
  .pill--red {
    background: var(--brand-primary-soft);
    color: var(--brand-primary);
  }

  /* ---------- 卡片 ---------- */
  .card {
    border: 1px solid var(--divider);
    border-radius: var(--radius-xl);
    background: var(--bg-surface);
    box-shadow: var(--shadow-card);
  }

  /* ---------- 拼豆轨道（识别锚点） ---------- */
  .bead-rail {
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .bead-dot {
    flex: none;
    inline-size: 12px;
    aspect-ratio: 1;
    border: 2px solid rgb(255 255 255 / 0.72);
    border-radius: 50%;
    background: var(--c);
    box-shadow: 0 1px 3px rgb(44 36 31 / 0.16);
  }
  .bead-rail--lg .bead-dot {
    inline-size: 16px;
  }
  /* 不对称轨道分隔：左侧偏置、长短不一 */
  .rail-divider {
    display: flex;
    align-items: center;
    gap: var(--space-4);
  }
  .rail-divider::after {
    flex: 1;
    block-size: 1px;
    background: var(--divider);
    content: '';
  }

  /* ---------- 拼豆板（真实图纸点阵） ---------- */
  .board {
    --bead: 18px;
    --gap: 2px;
    display: grid;
    grid-template-columns: repeat(var(--cols, 16), var(--bead));
    gap: var(--gap);
    inline-size: max-content;
    padding: calc(var(--bead) * 0.5);
    border-radius: var(--radius-lg);
    background: var(--board-bg);
    forced-color-adjust: none;
  }
  .bead {
    aspect-ratio: 1;
    border-radius: 50%;
    background: radial-gradient(circle, var(--bead-hole) 0 20%, var(--c) 23%);
    box-shadow: inset 0 -1px 0 rgb(0 0 0 / 0.14);
    transition:
      opacity 0.2s,
      scale 0.15s;
  }
  .bead.is-empty {
    background: radial-gradient(circle, var(--peg) 0 16%, transparent 19%);
    box-shadow: none;
  }
  .board.is-dimmed .bead:not(.is-match, .is-empty) {
    opacity: 0.16;
  }
  .board.is-editing {
    cursor: crosshair;
  }
  .board.is-editing .bead:hover {
    scale: 1.18;
    outline: 2px solid var(--accent-purple);
    outline-offset: 1px;
  }

  /* 色号色块 */
  .swatch {
    flex: none;
    inline-size: 14px;
    aspect-ratio: 1;
    border-radius: 50%;
    background: var(--c);
    box-shadow:
      inset 0 0 0 1px rgb(0 0 0 / 0.08),
      inset 0 -1px 0 rgb(0 0 0 / 0.12);
    forced-color-adjust: none;
  }
}

/* ========================================================================== */
@layer pages {
  /* ---------- 顶栏 ---------- */
  .site-header {
    position: sticky;
    inset-block-start: 0;
    z-index: 50;
    border-block-end: 1px solid transparent;
    background: rgb(255 248 241 / 0.9);
    backdrop-filter: saturate(1.4) blur(10px);
  }
  .site-header__inner {
    display: flex;
    align-items: center;
    gap: var(--space-5);
    min-block-size: 68px;
  }
  .brand {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: 800;
    font-size: 1.125rem;
  }
  .brand img {
    inline-size: 34px;
    block-size: 34px;
  }
  .brand small {
    display: block;
    color: var(--text-tertiary);
    font-size: 0.625rem;
    font-weight: 700;
    letter-spacing: 0.24em;
    line-height: 1;
  }
  .site-nav {
    display: flex;
    gap: var(--space-1);
    margin-inline-start: auto;
  }
  .site-nav a {
    display: inline-flex;
    align-items: center;
    min-block-size: 40px;
    padding-inline: var(--space-3);
    border-radius: var(--radius-round);
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-weight: 600;
  }
  .site-nav a:hover {
    background: var(--bg-subtle);
    color: var(--text-primary);
  }
  .site-nav a[aria-current='page'] {
    color: var(--text-primary);
  }
  @media (width < 820px) {
    .site-nav {
      display: none;
    }
    .site-header .btn {
      margin-inline-start: auto;
    }
  }

  /* ---------- Hero：偏置工作台 ---------- */
  .hero {
    padding-block: clamp(40px, 6vw, 88px) clamp(56px, 8vw, 112px);
    overflow-x: clip;
  }
  .nowrap {
    white-space: nowrap;
  }
  .hero__grid {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: center;
    gap: clamp(32px, 5vw, 72px);
  }
  .hero__copy {
    display: grid;
    gap: var(--space-5);
    justify-items: start;
  }
  .hero__copy .title-display em {
    font-style: normal;
    color: var(--brand-primary);
  }
  .hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
  }
  .hero__note {
    display: flex;
    align-items: center;
    gap: var(--space-2);
  }
  .hero__stats {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-6);
    padding-block-start: var(--space-5);
    border-block-start: 1px dashed var(--border-default);
  }
  .hero__stats dt {
    color: var(--text-tertiary);
    font-size: 0.8125rem;
  }
  .hero__stats dd {
    font-size: 1.5rem;
    font-weight: 800;
  }
  .hero__stats dd small {
    margin-inline-start: 2px;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 600;
  }
  @media (width < 960px) {
    .hero__grid {
      grid-template-columns: minmax(0, 1fr);
    }
    .workbench {
      rotate: 0deg;
    }
  }

  /* 工作台 */
  .workbench {
    position: relative;
    justify-self: center;
    display: grid;
    gap: var(--space-4);
    padding: var(--space-5);
    border-radius: var(--radius-xl);
    background: var(--bg-hero);
    box-shadow: var(--shadow-float);
    rotate: 1.2deg;
  }
  .workbench::before {
    position: absolute;
    inset-block-start: -56px;
    inset-inline-end: -48px;
    z-index: -1;
    inline-size: 200px;
    aspect-ratio: 1;
    border: 22px solid rgb(201 67 47 / 0.08);
    border-radius: 50%;
    content: '';
  }
  .workbench > .bead-rail {
    position: absolute;
    inset-block-start: 28px;
    inset-inline-end: -10px;
    flex-direction: column;
  }
  .workbench__bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
  }
  .tabs {
    display: inline-flex;
    padding: 3px;
    border-radius: var(--radius-round);
    background: var(--bg-surface);
    box-shadow: inset 0 0 0 1px var(--divider);
  }
  .tabs button {
    min-block-size: 34px;
    padding-inline: var(--space-4);
    border-radius: var(--radius-round);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 700;
  }
  .tabs button[aria-selected='true'] {
    background: var(--text-primary);
    color: #fff;
  }
  .edit-toggle[aria-pressed='true'] {
    border-color: var(--accent-purple);
    background: var(--accent-purple);
    color: #fff;
  }
  .edit-toggle[aria-pressed='false']:hover {
    border-color: var(--accent-purple);
    color: var(--accent-purple);
  }
  .workbench .board {
    --bead: clamp(12px, calc((100vw - 170px) / 17.5), 22px);
    box-shadow: inset 0 0 0 1px var(--divider);
  }
  .workbench__meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    min-block-size: 24px;
    color: var(--text-secondary);
    font-size: 0.8125rem;
  }
  .workbench__hint {
    color: var(--accent-purple);
    font-weight: 600;
  }
  .palette {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    max-inline-size: calc(var(--board-w, 400px));
  }
  .chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-block-size: 32px;
    padding: 0 10px 0 6px;
    border: 1px solid var(--divider);
    border-radius: var(--radius-round);
    background: var(--bg-surface);
    font-size: 0.75rem;
    font-weight: 600;
    transition: border-color 0.15s;
  }
  .chip:hover {
    border-color: var(--grid-strong);
  }
  .chip .count {
    color: var(--text-tertiary);
  }
  .chip[aria-pressed='true'] {
    border-color: var(--text-primary);
    box-shadow: inset 0 0 0 1px var(--text-primary);
  }
  .is-edit-mode .chip[aria-pressed='true'] {
    border-color: var(--accent-purple);
    box-shadow: inset 0 0 0 1px var(--accent-purple);
    color: var(--accent-purple);
  }
  .bead-tip {
    position: fixed;
    z-index: 60;
    padding: 6px 10px;
    border-radius: var(--radius-md);
    background: var(--text-primary);
    color: #fff;
    font-size: 0.75rem;
    white-space: nowrap;
    pointer-events: none;
    translate: -50% calc(-100% - 10px);
  }
  .bead-tip[hidden] {
    display: none;
  }

  /* ---------- 三步流程 ---------- */
  .steps {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-5);
    counter-reset: step;
  }
  .step {
    position: relative;
    display: grid;
    align-content: start;
    gap: var(--space-3);
    padding: var(--space-6);
  }
  .step__num {
    color: var(--brand-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 700;
  }
  .step h3 {
    font-size: 1.25rem;
  }
  .step__visual {
    display: grid;
    place-items: center;
    block-size: 132px;
    margin-block-end: var(--space-2);
    border-radius: var(--radius-lg);
    background: var(--bg-subtle);
  }
  .step__visual .board {
    --bead: 7px;
    --gap: 1px;
    padding: 6px;
  }
  .step__visual--trio {
    display: flex;
    justify-content: center;
    gap: var(--space-3);
    container-type: inline-size;
    overflow: hidden;
  }
  /* 三块 16 列板并排：48b + 105px ≤ 容器宽，按容器宽自适应珠子尺寸 */
  .step__visual--trio .board {
    --bead: clamp(3px, calc((100cqi - 105px) / 48), 5px);
  }
  .step__visual--trio.trio--lg .board {
    --bead: clamp(3px, calc((100cqi - 105px) / 48), 7px);
  }
  .upload-tile {
    display: grid;
    place-items: center;
    gap: var(--space-2);
    inline-size: 120px;
    block-size: 92px;
    border: 2px dashed var(--grid-thin);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    color: var(--text-tertiary);
    font-size: 0.75rem;
  }
  @media (width < 860px) {
    .steps {
      grid-template-columns: minmax(0, 1fr);
    }
  }

  /* ---------- 能力（非对称网格） ---------- */
  .features {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: var(--space-5);
  }
  .feature {
    display: grid;
    align-content: start;
    gap: var(--space-3);
    padding: var(--space-6);
    container-type: inline-size;
  }
  .feature h3 {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 1.2rem;
  }
  .feature--wide {
    grid-column: span 4;
  }
  .feature--half {
    grid-column: span 3;
  }
  .feature--narrow {
    grid-column: span 2;
  }
  .feature--edit {
    border-color: rgb(100 87 217 / 0.22);
    background: var(--accent-purple-soft);
  }
  @media (width < 960px) {
    .feature--wide,
    .feature--half,
    .feature--narrow {
      grid-column: span 6;
    }
  }

  .palette-table {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2) var(--space-5);
    margin-block-start: var(--space-3);
  }
  @container (width > 520px) {
    .palette-table {
      grid-template-columns: repeat(3, minmax(0, 1fr));
    }
  }
  .palette-table li {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding-block: 6px;
    border-block-end: 1px dashed var(--divider);
    font-size: 0.875rem;
  }
  .palette-table .mono {
    color: var(--text-tertiary);
    font-size: 0.75rem;
  }

  .tools {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-block-start: var(--space-2);
  }
  .tool {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid rgb(100 87 217 / 0.24);
    border-radius: var(--radius-round);
    background: var(--bg-surface);
    color: var(--accent-purple);
    font-size: 0.8125rem;
    font-weight: 700;
  }
  .tool svg {
    inline-size: 16px;
    block-size: 16px;
  }

  .split-boards {
    display: grid;
    grid-template-columns: repeat(2, max-content);
    gap: 6px;
    justify-content: start;
    margin-block-start: var(--space-3);
  }
  .split-boards .board {
    --bead: 8px;
    --gap: 1px;
    padding: 5px;
    box-shadow: inset 0 0 0 1px var(--grid-thin);
  }
  .split-boards .board.is-done {
    box-shadow: inset 0 0 0 2px var(--success);
  }
  .progress {
    display: grid;
    gap: var(--space-2);
    margin-block-start: var(--space-3);
  }
  .progress__bar {
    display: flex;
    gap: 4px;
  }
  .progress__bar span {
    flex: 1;
    block-size: 8px;
    border-radius: var(--radius-round);
    background: var(--divider);
  }
  .progress__bar span.on {
    background: var(--success);
  }

  .export-sheet {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-3);
    align-items: start;
    margin-block-start: var(--space-3);
    padding: var(--space-4);
    border: 1px solid var(--divider);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    box-shadow: 4px 4px 0 var(--bg-subtle);
  }
  .export-sheet .board {
    --bead: 6px;
    --gap: 1px;
    padding: 4px;
  }
  .export-sheet ul {
    display: grid;
    gap: 4px;
    font-size: 0.6875rem;
  }
  .export-sheet li {
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .export-sheet .swatch {
    inline-size: 10px;
  }

  .privacy-points {
    display: grid;
    gap: var(--space-2);
    margin-block-start: var(--space-2);
    font-size: 0.9375rem;
  }
  .privacy-points li {
    display: flex;
    gap: var(--space-2);
  }
  .privacy-points li::before {
    flex: none;
    inline-size: 8px;
    block-size: 8px;
    margin-block-start: 0.6em;
    border-radius: 50%;
    background: var(--success);
    content: '';
  }

  /* ---------- 作品 ---------- */
  .gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--space-5);
  }
  .work {
    display: grid;
    gap: var(--space-4);
    padding: var(--space-5);
  }
  .work:nth-child(even) {
    translate: 0 var(--space-5);
  }
  .work .board {
    --bead: 11px;
    --gap: 1px;
    justify-self: center;
  }
  .work figcaption {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-2);
  }
  .work figcaption strong {
    font-size: 1.05rem;
  }
  @media (width < 560px) {
    .work:nth-child(even) {
      translate: none;
    }
  }

  /* ---------- FAQ ---------- */
  .faq {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
    gap: var(--space-7);
  }
  @media (width < 860px) {
    .faq {
      grid-template-columns: 1fr;
    }
  }
  .faq .section-head {
    align-content: start;
  }
  .faq__list {
    display: grid;
    gap: var(--space-3);
  }
  .faq details {
    border: 1px solid var(--divider);
    border-radius: var(--radius-lg);
    background: var(--bg-surface);
  }
  .faq summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    min-block-size: 56px;
    padding: var(--space-3) var(--space-5);
    font-weight: 700;
    cursor: pointer;
    list-style: none;
  }
  .faq summary::-webkit-details-marker {
    display: none;
  }
  .faq summary::after {
    flex: none;
    inline-size: 10px;
    block-size: 10px;
    border-inline-end: 2px solid var(--text-tertiary);
    border-block-end: 2px solid var(--text-tertiary);
    rotate: 45deg;
    translate: 0 -2px;
    transition: rotate 0.2s;
    content: '';
  }
  .faq details[open] summary::after {
    rotate: 225deg;
    translate: 0 2px;
  }
  .faq details p {
    padding: 0 var(--space-5) var(--space-5);
    color: var(--text-secondary);
  }

  /* ---------- 收尾 CTA ---------- */
  .cta {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: var(--space-6);
    padding: clamp(32px, 5vw, 56px);
    overflow: hidden;
    border-radius: var(--radius-xl);
    background: var(--bg-hero);
  }
  .cta::after {
    position: absolute;
    inset-block-end: -80px;
    inset-inline-end: 18%;
    inline-size: 220px;
    aspect-ratio: 1;
    border: 26px solid rgb(100 87 217 / 0.07);
    border-radius: 50%;
    content: '';
  }
  .cta > * {
    position: relative;
    z-index: 1;
  }
  .cta__copy {
    display: grid;
    gap: var(--space-3);
  }
  .qr-slot {
    display: grid;
    place-items: center;
    gap: var(--space-2);
    inline-size: 160px;
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    background: var(--bg-surface);
    box-shadow: var(--shadow-card);
    text-align: center;
  }
  .qr-slot .board {
    --bead: 6px;
    --gap: 1px;
    padding: 4px;
  }
  @media (width < 720px) {
    .cta {
      grid-template-columns: 1fr;
    }
  }

  /* ---------- 页脚 ---------- */
  .site-footer {
    margin-block-start: var(--space-8);
    padding-block: var(--space-7) var(--space-6);
    border-block-start: 1px solid var(--divider);
    background: var(--bg-subtle);
    font-size: 0.875rem;
  }
  .site-footer__top {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--space-6);
    padding-block-end: var(--space-6);
  }
  .footer-brand {
    display: grid;
    gap: var(--space-3);
    max-inline-size: 360px;
  }
  .footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-6);
  }
  .footer-links a {
    color: var(--text-secondary);
  }
  .footer-links a:hover {
    color: var(--text-primary);
  }
  .site-footer__legal {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding-block-start: var(--space-5);
    border-block-start: 1px dashed var(--border-default);
    color: var(--text-tertiary);
  }
  .beian {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-5);
  }
  .beian a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
  }
  .beian a:hover {
    color: var(--text-primary);
  }

  /* ---------- 法律文档页 ---------- */
  .doc {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: var(--space-7);
    padding-block: var(--space-7) var(--space-8);
  }
  .doc__aside {
    position: sticky;
    inset-block-start: 96px;
    align-self: start;
    display: grid;
    gap: var(--space-2);
  }
  .doc__aside a {
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.9375rem;
  }
  .doc__aside a:hover {
    background: var(--bg-surface);
  }
  .doc__aside a[aria-current='page'] {
    background: var(--bg-surface);
    color: var(--text-primary);
    font-weight: 700;
    box-shadow: var(--shadow-card);
  }
  .doc__body {
    display: grid;
    gap: var(--space-5);
    max-inline-size: 760px;
  }
  .doc__head {
    display: grid;
    gap: var(--space-3);
  }
  .notice {
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-lg);
    background: var(--warning-soft);
    color: var(--text-secondary);
    font-size: 0.9375rem;
  }
  .doc section {
    padding: var(--space-6);
  }
  .doc section h2 {
    margin-block-end: var(--space-3);
    font-size: 1.2rem;
  }
  .doc section p + p,
  .doc section p + ul,
  .doc section ul + p {
    margin-block-start: var(--space-3);
  }
  .doc section ul {
    display: grid;
    gap: var(--space-2);
    padding-inline-start: 1.2em;
    list-style: disc;
    color: var(--text-secondary);
  }
  .doc section p {
    color: var(--text-secondary);
  }
  @media (width < 860px) {
    .doc {
      grid-template-columns: 1fr;
    }
    .doc__aside {
      position: static;
      display: flex;
      flex-wrap: wrap;
    }
  }

  /* ---------- 404 ---------- */
  .not-found {
    display: grid;
    place-items: center;
    gap: var(--space-5);
    min-block-size: 60dvh;
    padding-block: var(--space-8);
    text-align: center;
  }
}

/* ========================================================================== */
@layer motion {
  /* 首屏一次性拼豆落位：按对角线依次弹入 */
  @keyframes bead-in {
    from {
      opacity: 0;
      scale: 0.3;
    }
  }
  .board[data-animate] .bead:not(.is-empty) {
    animation: bead-in 0.42s cubic-bezier(0.34, 1.56, 0.64, 1) both;
    animation-delay: calc(var(--d, 0) * 28ms + 120ms);
  }
  @keyframes rise-in {
    from {
      opacity: 0;
      translate: 0 14px;
    }
  }
  .hero__copy > * {
    animation: rise-in 0.6s cubic-bezier(0.2, 0.7, 0.2, 1) both;
  }
  .hero__copy > :nth-child(2) {
    animation-delay: 60ms;
  }
  .hero__copy > :nth-child(3) {
    animation-delay: 120ms;
  }
  .hero__copy > :nth-child(4) {
    animation-delay: 180ms;
  }
  .hero__copy > :nth-child(5) {
    animation-delay: 240ms;
  }

  /* 渐进增强：滚动后顶栏出现分割线（装饰性，无需回退） */
  @supports ((animation-timeline: scroll()) and (animation-range: 0% 100%)) {
    @keyframes header-settle {
      to {
        border-block-end-color: var(--divider);
        box-shadow: 0 6px 24px rgb(45 31 24 / 0.06);
      }
    }
    .site-header {
      animation: header-settle linear both;
      animation-timeline: scroll(block root);
      animation-range: 0 120px;
    }
    @keyframes reveal {
      from {
        opacity: 0;
        translate: 0 24px;
      }
    }
    .reveal {
      animation: reveal linear both;
      animation-timeline: view();
      animation-range: entry 0% entry 60%;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    .board[data-animate] .bead:not(.is-empty),
    .hero__copy > *,
    .reveal {
      animation: none;
    }
    .bead,
    .btn,
    .chip {
      transition: none;
    }
  }
}

@layer pages {
  .split-boards--mini {
    margin: 0;
  }
  .split-boards--mini .board {
    --bead: 6px;
    padding: 4px;
  }

  .variant-compare {
    align-items: start;
    block-size: auto;
    margin-block-start: var(--space-2);
    padding: var(--space-5) var(--space-4);
  }
  .variant-compare figure {
    display: grid;
    gap: var(--space-2);
    justify-items: center;
  }
  .variant-compare figcaption {
    display: grid;
    justify-items: center;
    color: var(--text-primary);
    font-weight: 700;
    text-align: center;
  }
  .variant-compare figcaption span {
    color: var(--text-tertiary);
    font-weight: 400;
  }

  .doc section a {
    color: var(--brand-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
  }
  .doc section strong {
    color: var(--text-primary);
  }
  .not-found .board {
    --bead: clamp(10px, 3vw, 14px);
  }

  @media (width < 860px) {
    .doc,
    .faq {
      grid-template-columns: minmax(0, 1fr);
    }
    .faq {
      gap: var(--space-5);
    }
  }
  @media (width < 720px) {
    .cta {
      grid-template-columns: minmax(0, 1fr);
    }
  }
}