@layer reset, base, layout, components, utilities;

@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  * { margin: 0; }
  html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
  body { min-height: 100dvh; line-height: 1.6; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
  img, svg, video { display: block; max-width: 100%; }
  img { height: auto; }
  input, button, textarea, select { font: inherit; color: inherit; }
  button { background: none; border: 0; cursor: pointer; }
  a { color: inherit; text-decoration: none; }
  ul, ol { list-style: none; padding: 0; }
  h1, h2, h3, h4 { line-height: 1.15; text-wrap: balance; }
  p { text-wrap: pretty; }
}

@layer base {
  :root {
    --ink: #10130f;
    --ink-2: #2b312c;
    --ink-3: #5c665e;
    --paper: #f4f1ea;
    --paper-2: #eae5da;
    --card: #fffdf8;
    --line: rgba(16, 19, 15, .14);
    --line-2: rgba(16, 19, 15, .07);
    --lime: #c8f24a;
    --lime-deep: #a8d42c;
    --clay: #c8552f;
    --blue: #2f5bea;
    --serif: "Fraunces", "Playfair Display", "Songti SC", "Times New Roman", serif;
    --sans: "Space Grotesk", "Plus Jakarta Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
    --gutter: clamp(1.25rem, 4vw, 4.5rem);
    --maxw: 78rem;
    --ease-out: cubic-bezier(.22, 1, .36, 1);
    --ease-spring: cubic-bezier(.34, 1.56, .64, 1);
  }

  body {
    background: var(--paper);
    color: var(--ink);
    font-family: var(--sans);
    font-size: clamp(.98rem, .35vw + .9rem, 1.06rem);
    overflow-x: clip;
  }

  ::selection { background: var(--lime); color: var(--ink); }

  :focus-visible {
    outline: 2.5px solid var(--blue);
    outline-offset: 3px;
    border-radius: 3px;
  }

  h1, h2, h3, .serif { font-family: var(--serif); font-weight: 500; letter-spacing: -.015em; }

  .skip {
    position: absolute; left: 1rem; top: -4rem; z-index: 999;
    background: var(--ink); color: var(--paper);
    padding: .7rem 1.1rem; border-radius: 999px; font-size: .875rem;
    transition: top .28s var(--ease-out);
  }
  .skip:focus { top: 1rem; }
}

@layer layout {
  .wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
  .wrap-narrow { max-width: 46rem; }
  .band { padding-block: clamp(4rem, 9vw, 8.5rem); }
  .band-tight { padding-block: clamp(2.75rem, 5vw, 4.5rem); }

  .grid-12 { display: grid; grid-template-columns: repeat(12, 1fr); gap: clamp(1rem, 2.2vw, 2rem); }
  .col-7 { grid-column: span 7; }
  .col-6 { grid-column: span 6; }
  .col-5 { grid-column: span 5; }
  .col-4 { grid-column: span 4; }
  .offset-2 { grid-column-start: 2; }

  @media (max-width: 900px) {
    .grid-12 { grid-template-columns: 1fr; }
    .col-7, .col-6, .col-5, .col-4 { grid-column: span 1; }
    .offset-2 { grid-column-start: 1; }
  }

  .stack > * + * { margin-top: 1.1em; }
  .split { display: flex; justify-content: space-between; align-items: end; gap: 2rem; flex-wrap: wrap; }
}

@layer components {
  /* ── 站点头 ─────────────────────────── */
  .site-head {
    position: sticky; top: 0; z-index: 100;
    background: color-mix(in srgb, var(--paper) 88%, transparent);
    backdrop-filter: blur(14px) saturate(1.2);
    border-bottom: 1px solid var(--line-2);
  }
  .head-inner { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; height: 4.5rem; }
  .logo { display: flex; align-items: center; gap: .6rem; font-family: var(--serif); font-size: 1.3rem; letter-spacing: -.02em; }
  .logo-mark {
    width: 1.85rem; height: 1.85rem; flex: none;
    transition: transform .5s var(--ease-spring);
  }
  .logo:hover .logo-mark { transform: rotate(-14deg) scale(1.08); }

  .nav { display: flex; align-items: center; gap: clamp(1rem, 2vw, 2rem); font-size: .925rem; }
  .nav a { position: relative; color: var(--ink-2); padding-block: .35rem; }
  .nav a::after {
    content: ""; position: absolute; left: 0; bottom: 0; height: 1.5px; width: 100%;
    background: var(--ink); transform: scaleX(0); transform-origin: right;
    transition: transform .42s var(--ease-out);
  }
  .nav a:hover::after, .nav a[aria-current="page"]::after { transform: scaleX(1); transform-origin: left; }
  .nav a[aria-current="page"] { color: var(--ink); }

  .nav-toggle { display: none; width: 2.5rem; height: 2.5rem; place-items: center; }
  @media (max-width: 900px) {
    .nav-toggle { display: grid; }
    .nav {
      position: absolute; inset: 4.5rem 0 auto; flex-direction: column; align-items: stretch;
      background: var(--card); border-bottom: 1px solid var(--line);
      padding: 1rem var(--gutter) 1.6rem; gap: .25rem;
      clip-path: inset(0 0 100% 0); pointer-events: none;
      transition: clip-path .45s var(--ease-out);
    }
    .nav[data-open="true"] { clip-path: inset(0 0 0 0); pointer-events: auto; }
    .nav a { padding-block: .8rem; border-bottom: 1px solid var(--line-2); }
    .nav .btn { margin-top: .75rem; text-align: center; }
  }

  /* ── 按钮 ───────────────────────────── */
  .btn {
    display: inline-flex; align-items: center; gap: .5rem;
    padding: .72rem 1.35rem; border-radius: 999px;
    font-size: .925rem; font-weight: 500; letter-spacing: .01em;
    background: var(--ink); color: var(--paper);
    border: 1px solid var(--ink);
    transition: transform .3s var(--ease-spring), background .3s var(--ease-out), color .3s var(--ease-out);
  }
  .btn:hover { transform: translateY(-2px); background: var(--clay); border-color: var(--clay); }
  .btn:active { transform: translateY(0) scale(.97); }
  .btn svg { transition: transform .35s var(--ease-out); }
  .btn:hover svg { transform: translate(3px, -3px); }

  .btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
  .btn-ghost:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
  .btn-lime { background: var(--lime); color: var(--ink); border-color: var(--lime); }
  .btn-lime:hover { background: var(--lime-deep); border-color: var(--lime-deep); }
  .btn-block { width: 100%; justify-content: center; }

  .arrow-link {
    display: inline-flex; align-items: center; gap: .45rem;
    font-size: .925rem; font-weight: 500; color: var(--ink);
    border-bottom: 1px solid var(--line); padding-bottom: 2px;
    transition: gap .3s var(--ease-out), border-color .3s var(--ease-out), color .3s var(--ease-out);
  }
  .arrow-link:hover { gap: .8rem; border-color: var(--clay); color: var(--clay); }

  /* ── 通用文本件 ─────────────────────── */
  .eyebrow {
    display: inline-flex; align-items: center; gap: .55rem;
    font-size: .78rem; letter-spacing: .16em; text-transform: uppercase;
    color: var(--ink-3); font-weight: 500;
  }
  .eyebrow::before { content: ""; width: 1.6rem; height: 1px; background: var(--clay); }

  .h-display { font-size: clamp(2.3rem, 5.6vw, 4.35rem); line-height: 1.04; letter-spacing: -.03em; }
  .h-section { font-size: clamp(1.75rem, 3.2vw, 2.6rem); letter-spacing: -.025em; }
  .h-card { font-size: clamp(1.15rem, 1.4vw, 1.35rem); letter-spacing: -.02em; }

  .lede { font-size: clamp(1.05rem, .6vw + .95rem, 1.24rem); color: var(--ink-2); line-height: 1.72; }
  .prose p + p { margin-top: 1.05em; }
  .prose p { color: var(--ink-2); }
  .prose strong { color: var(--ink); font-weight: 600; }
  .muted { color: var(--ink-3); }
  .figure-note { font-size: .82rem; color: var(--ink-3); margin-top: .7rem; letter-spacing: .01em; }

  .tag {
    display: inline-block; font-size: .75rem; letter-spacing: .08em;
    padding: .3rem .7rem; border: 1px solid var(--line); border-radius: 999px;
    color: var(--ink-3); text-transform: uppercase;
  }

  /* ── 首页 Hero：非对称编辑式 ─────────── */
  .hero { position: relative; padding-block: clamp(3.5rem, 7vw, 7rem) clamp(4rem, 8vw, 8rem); overflow: clip; }
  .hero-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: clamp(1rem, 2.2vw, 2rem); align-items: start; }
  .hero-copy { grid-column: 1 / span 7; padding-top: clamp(0rem, 3vw, 2.5rem); }
  .hero-side { grid-column: 9 / span 4; }
  @media (max-width: 900px) {
    .hero-grid { grid-template-columns: 1fr; }
    .hero-copy, .hero-side { grid-column: 1; }
    .hero-side { margin-top: 1rem; }
  }
  .hero .h-display em { font-style: italic; color: var(--clay); }
  .hero .h-display u { text-decoration: none; background: linear-gradient(transparent 62%, var(--lime) 62%, var(--lime) 92%, transparent 92%); }

  .hero-visual {
    position: relative; border-radius: 14px; overflow: hidden;
    border: 1px solid var(--line); background: var(--card);
    aspect-ratio: 4 / 5;
  }
  .hero-visual img { width: 100%; height: 100%; object-fit: cover; will-change: transform; }
  .hero-visual::after {
    content: ""; position: absolute; inset: 0;
    background: linear-gradient(200deg, transparent 45%, color-mix(in srgb, var(--ink) 30%, transparent));
    pointer-events: none;
  }
  .hero-badge {
    position: absolute; left: 1rem; bottom: 1rem; z-index: 2;
    background: color-mix(in srgb, var(--paper) 92%, transparent);
    backdrop-filter: blur(8px);
    border: 1px solid var(--line); border-radius: 10px;
    padding: .7rem .9rem; font-size: .8rem; line-height: 1.45;
  }
  .hero-badge b { display: block; font-family: var(--serif); font-size: 1.25rem; }

  .ticker {
    border-block: 1px solid var(--line);
    display: flex; gap: clamp(1.5rem, 4vw, 3.5rem); flex-wrap: wrap;
    padding-block: 1.1rem; font-size: .875rem; color: var(--ink-3);
  }
  .ticker b { color: var(--ink); font-family: var(--serif); font-size: 1.05rem; font-weight: 500; }

  /* ── 卡片与列表 ─────────────────────── */
  .card {
    background: var(--card); border: 1px solid var(--line); border-radius: 12px;
    padding: clamp(1.4rem, 2.4vw, 2rem);
    transition: transform .45s var(--ease-out), border-color .45s var(--ease-out), box-shadow .45s var(--ease-out);
  }
  .card:hover {
    transform: translateY(-5px);
    border-color: color-mix(in srgb, var(--ink) 35%, transparent);
    box-shadow: 0 18px 40px -24px rgba(16, 19, 15, .45);
  }
  .card-index { font-family: var(--serif); font-size: .95rem; color: var(--clay); letter-spacing: .05em; }

  .media {
    border-radius: 10px; overflow: hidden; border: 1px solid var(--line-2); background: var(--paper-2);
  }
  .media img { width: 100%; height: 100%; object-fit: cover; transition: transform .7s var(--ease-out); }
  .card:hover .media img, .media:hover img { transform: scale(1.045); }

  .feature-row {
    display: grid; grid-template-columns: repeat(12, 1fr); gap: clamp(1rem, 2.4vw, 2.5rem);
    align-items: center; padding-block: clamp(2.5rem, 5vw, 4.5rem);
    border-top: 1px solid var(--line-2);
  }
  .feature-row:nth-child(even) .feature-media { order: -1; }
  .feature-row .feature-copy { grid-column: span 6; }
  .feature-row .feature-media { grid-column: span 6; }
  @media (max-width: 900px) {
    .feature-row { grid-template-columns: 1fr; }
    .feature-row .feature-copy, .feature-row .feature-media { grid-column: 1; }
    .feature-row:nth-child(even) .feature-media { order: 0; }
  }
  .feature-media { aspect-ratio: 16 / 10; border-radius: 12px; overflow: hidden; border: 1px solid var(--line); }
  .feature-media img { width: 100%; height: 100%; object-fit: cover; }

  .spec-list { display: grid; gap: .85rem; margin-top: 1.4rem; }
  .spec-list li { display: flex; gap: .7rem; font-size: .95rem; color: var(--ink-2); align-items: baseline; }
  .spec-list svg { flex: none; margin-top: .25rem; color: var(--lime-deep); }
  .spec-list b { color: var(--ink); font-weight: 600; }

  /* ── 场景页 ─────────────────────────── */
  .case-card { display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(1.2rem, 2.5vw, 2.2rem); align-items: start; }
  @media (max-width: 900px) { .case-card { grid-template-columns: 1fr; } }
  .quote { font-family: var(--serif); font-size: clamp(1.1rem, 1.5vw, 1.35rem); line-height: 1.5; letter-spacing: -.01em; }
  .who { display: flex; align-items: center; gap: .75rem; font-size: .875rem; }
  .who img { width: 2.75rem; height: 2.75rem; border-radius: 50%; object-fit: cover; border: 1px solid var(--line); }

  .metric-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line-2); border: 1px solid var(--line-2); border-radius: 10px; overflow: hidden; }
  @media (max-width: 760px) { .metric-strip { grid-template-columns: repeat(2, 1fr); } }
  .metric-strip div { background: var(--card); padding: clamp(1.1rem, 2vw, 1.6rem); }
  .metric-strip b { display: block; font-family: var(--serif); font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 500; letter-spacing: -.02em; }
  .metric-strip span { font-size: .82rem; color: var(--ink-3); }

  /* ── FAQ ────────────────────────────── */
  .faq details { border-bottom: 1px solid var(--line-2); padding-block: .35rem; }
  .faq summary {
    display: flex; justify-content: space-between; gap: 1.5rem; align-items: start;
    padding-block: 1.05rem; cursor: pointer; font-size: 1.03rem; font-weight: 500;
    list-style: none;
  }
  .faq summary::-webkit-details-marker { display: none; }
  .faq summary::after {
    content: ""; flex: none; width: .85rem; height: .85rem; margin-top: .45rem;
    background:
      linear-gradient(var(--ink), var(--ink)) center/100% 1.5px no-repeat,
      linear-gradient(var(--ink), var(--ink)) center/1.5px 100% no-repeat;
    transition: transform .4s var(--ease-spring), opacity .3s linear;
  }
  .faq details[open] summary::after { transform: rotate(135deg); opacity: .45; }
  .faq .answer { padding-bottom: 1.25rem; max-width: 52rem; color: var(--ink-2); font-size: .975rem; }

  /* ── 价格页 ─────────────────────────── */
  .plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1rem, 2vw, 1.6rem); align-items: start; }
  @media (max-width: 900px) { .plans { grid-template-columns: 1fr; } }
  .plan { position: relative; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: clamp(1.5rem, 2.5vw, 2.1rem); }
  .plan-featured { background: var(--ink); color: var(--paper); transform: scale(1.015); }
  .plan-featured .muted, .plan-featured .spec-list li { color: rgba(244, 241, 234, .74); }
  .plan-featured .spec-list b { color: var(--paper); }
  .plan-featured .btn { background: var(--lime); color: var(--ink); border-color: var(--lime); }
  .plan-featured .btn:hover { background: var(--paper); border-color: var(--paper); }
  @media (max-width: 900px) { .plan-featured { transform: none; } }
  .price { display: flex; align-items: baseline; gap: .3rem; margin-block: 1rem 1.4rem; }
  .price b { font-family: var(--serif); font-size: clamp(2.4rem, 4.5vw, 3.2rem); font-weight: 500; letter-spacing: -.03em; }
  .price span { font-size: .9rem; color: var(--ink-3); }
  .plan-featured .price span { color: rgba(244, 241, 234, .6); }
  .plan .spec-list { border-top: 1px solid var(--line-2); padding-top: 1.2rem; }
  .plan-featured .spec-list { border-color: rgba(244, 241, 234, .18); }
  .plan .btn { margin-top: 1.6rem; }
  .plan-ribbon { position: absolute; top: -.7rem; left: 1.5rem; background: var(--clay); color: #fff; font-size: .72rem; letter-spacing: .1em; padding: .32rem .7rem; border-radius: 999px; text-transform: uppercase; }

  .compare { width: 100%; border-collapse: collapse; font-size: .925rem; }
  .compare th, .compare td { text-align: left; padding: .9rem .8rem; border-bottom: 1px solid var(--line-2); }
  .compare thead th { font-family: var(--serif); font-weight: 500; font-size: 1rem; border-bottom: 1px solid var(--line); }
  .compare tbody tr:hover { background: color-mix(in srgb, var(--lime) 22%, transparent); }
  .compare td:not(:first-child) { color: var(--ink-2); }
  .table-scroll { overflow-x: auto; border: 1px solid var(--line-2); border-radius: 12px; background: var(--card); }

  /* ── 博客页 ─────────────────────────── */
  .post-list { display: grid; gap: clamp(1.6rem, 3vw, 2.6rem); }
  .post-item { display: grid; grid-template-columns: 1fr 1.15fr; gap: clamp(1.2rem, 2.6vw, 2.4rem); align-items: start; padding-bottom: clamp(1.6rem, 3vw, 2.6rem); border-bottom: 1px solid var(--line-2); }
  .post-item:last-child { border-bottom: 0; }
  @media (max-width: 860px) { .post-item { grid-template-columns: 1fr; } }
  .post-media { aspect-ratio: 3 / 2; border-radius: 12px; overflow: hidden; border: 1px solid var(--line); }
  .post-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s var(--ease-out); }
  .post-item:hover .post-media img { transform: scale(1.05); }
  .post-meta { display: flex; flex-wrap: wrap; gap: .5rem .9rem; font-size: .8rem; color: var(--ink-3); margin-bottom: .75rem; }
  .post-meta span { display: inline-flex; align-items: center; gap: .35rem; }
  .dot { width: 3px; height: 3px; border-radius: 50%; background: currentColor; }

  /* ── CTA + 页脚 ─────────────────────── */
  .cta-band { background: var(--ink); color: var(--paper); border-radius: 18px; padding: clamp(2.2rem, 5vw, 4rem); position: relative; overflow: hidden; }
  .cta-band::before {
    content: ""; position: absolute; right: -12%; top: -40%; width: 55%; aspect-ratio: 1; border-radius: 50%;
    background: radial-gradient(circle, color-mix(in srgb, var(--lime) 55%, transparent), transparent 68%);
    transition: transform .9s var(--ease-out);
  }
  .cta-band:hover::before { transform: scale(1.12) translate(-3%, 4%); }
  .cta-band h2 { position: relative; font-size: clamp(1.8rem, 3.6vw, 2.9rem); letter-spacing: -.03em; }
  .cta-band p { position: relative; color: rgba(244, 241, 234, .72); max-width: 34rem; margin-top: .9rem; }
  .cta-band .btn { position: relative; margin-top: 1.8rem; }
  .cta-band .btn-ghost { color: var(--paper); border-color: rgba(244, 241, 234, .3); }
  .cta-band .btn-ghost:hover { background: var(--paper); color: var(--ink); border-color: var(--paper); }

  .site-foot { border-top: 1px solid var(--line); padding-block: clamp(2.5rem, 5vw, 4rem) 2rem; font-size: .875rem; }
  .foot-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: clamp(1.5rem, 3vw, 2.5rem); }
  @media (max-width: 860px) { .foot-grid { grid-template-columns: 1fr 1fr; } }
  .foot-col h3 { font-size: .78rem; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); font-family: var(--sans); font-weight: 500; margin-bottom: .9rem; }
  .foot-col li + li { margin-top: .55rem; }
  .foot-col a { color: var(--ink-2); transition: color .25s linear, padding-left .3s var(--ease-out); }
  .foot-col a:hover { color: var(--clay); padding-left: 4px; }
  .foot-bottom { display: flex; justify-content: space-between; gap: 1.5rem; flex-wrap: wrap; margin-top: clamp(2rem, 4vw, 3.2rem); padding-top: 1.4rem; border-top: 1px solid var(--line-2); color: var(--ink-3); font-size: .8rem; }

  .breadcrumbs { font-size: .82rem; color: var(--ink-3); padding-block: 1.1rem; }
  .breadcrumbs ol { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }
  .breadcrumbs a:hover { color: var(--clay); }
  .page-head { padding-block: clamp(2.5rem, 5vw, 4.5rem) clamp(1.5rem, 3vw, 2.5rem); }
}

@layer utilities {
  .reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease-out), transform .7s var(--ease-out); transition-delay: var(--d, 0ms); }
  .reveal.is-in { opacity: 1; transform: none; }
  .parallax { will-change: transform; }

  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .reveal { opacity: 1; transform: none; transition: none; }
    *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  }

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

  .sr-only-focusable:focus { position: static; width: auto; height: auto; margin: 0; overflow: visible; clip: auto; white-space: normal; }
}

@media print {
  .site-head, .nav-toggle, .cta-band::before, .btn { display: none; }
  body { background: #fff; }
  .card, .plan { border-color: #ccc; box-shadow: none; }
}