/* 设计 token 手动同步自 front/assets/theme.css（无构建管线联动，改品牌色两处都要改） */
:root {
  --teal: #02abb0;
  --teal-deep: #01898d;
  --teal-dark: #0f5f63;
  --teal-soft: #7bd4d6;
  --teal-faint: #ddf1f2;
  --mist: #eff9f9;
  --card: #ffffff;
  --ink: #16333a;
  --dim: #66878b;
  --line: #e3efef;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow-card: 0 1px 2px rgba(15, 95, 99, 0.05), 0 8px 24px rgba(15, 95, 99, 0.06);
  --shadow-hero: 0 24px 60px rgba(15, 95, 99, 0.14);
  --container: 1120px;
  font-family: system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Noto Sans', sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #ffffff;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--teal-deep);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
  border-radius: 4px;
}

.icon {
  width: 22px;
  height: 22px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex: none;
}

.wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 88px 0;
}

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--teal-deep);
  background: var(--teal-faint);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 16px;
}

h1, h2, h3 {
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 32px;
}

.section-head {
  max-width: 640px;
  margin: 0 0 48px;
}

.section-head p {
  color: var(--dim);
  font-size: 16px;
  margin: 12px 0 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  border: 0;
  white-space: nowrap;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--teal), var(--teal-deep));
  color: #fff;
  box-shadow: 0 10px 24px rgba(2, 171, 176, 0.28);
}

.btn-disabled {
  background: var(--teal-faint);
  color: var(--teal-dark);
  cursor: not-allowed;
  box-shadow: none;
  opacity: 0.9;
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}

/* ---------- 页头 ---------- */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  margin-right: auto;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(2, 171, 176, 0.22);
}

.brand-names h1 {
  font-size: 16px;
  font-weight: 800;
}

.brand-alt {
  margin: 0;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal);
}

nav.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

nav.site-nav a {
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
}

nav.site-nav a:hover {
  color: var(--teal-deep);
  text-decoration: none;
}

/* ---------- Hero ---------- */
.hero {
  padding: 72px 0 96px;
  background:
    radial-gradient(720px 420px at 88% -10%, var(--teal-faint), transparent 65%),
    var(--mist);
}

.hero .wrap {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: center;
}

.hero h1 {
  font-size: 44px;
  line-height: 1.18;
}

.hero h1 span {
  color: var(--teal-deep);
}

.hero-sub {
  margin: 20px 0 32px;
  font-size: 17px;
  color: var(--dim);
  max-width: 480px;
}

.hero-stats {
  display: flex;
  gap: 28px;
  margin-top: 40px;
}

.hero-stats div strong {
  display: block;
  font-size: 22px;
  color: var(--teal-dark);
}

.hero-stats div span {
  font-size: 13px;
  color: var(--dim);
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-cta .hint {
  font-size: 13px;
  color: var(--dim);
}

/* 仿浏览器窗口 mockup */
.browser-mock {
  background: var(--card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-hero);
  border: 1px solid var(--line);
  overflow: hidden;
}

.browser-mock .bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--teal-faint);
  border-bottom: 1px solid var(--line);
}

.browser-mock .dots {
  display: flex;
  gap: 6px;
}

.browser-mock .dots i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--teal-soft);
  display: block;
}

.browser-mock .url {
  flex: 1;
  background: #fff;
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 12px;
  color: var(--dim);
}

.browser-mock .url b {
  color: var(--teal-deep);
}

.browser-mock .page {
  padding: 26px 24px 30px;
}

.mock-line {
  height: 11px;
  border-radius: 6px;
  background: var(--line);
  margin-bottom: 10px;
}

.mock-block {
  border-radius: 12px;
  padding: 16px 18px;
  margin-bottom: 16px;
}

.mock-block.original {
  background: #f6f9f9;
  color: var(--dim);
  font-size: 13px;
}

.mock-block.translated {
  background: var(--teal-faint);
  color: var(--teal-dark);
  font-size: 14px;
  font-weight: 600;
  border: 1px dashed var(--teal-soft);
}

.mock-swap {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: -6px 0 10px;
}

.mock-swap .icon {
  width: 18px;
  height: 18px;
  color: var(--teal);
}

.mock-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 700;
  color: var(--teal-deep);
  background: #fff;
  border: 1px solid var(--teal-faint);
  padding: 4px 10px;
  border-radius: 999px;
}

/* ---------- 功能网格 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 26px 24px;
  transition: transform 0.15s, box-shadow 0.15s;
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 32px rgba(15, 95, 99, 0.1);
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--teal-faint);
  color: var(--teal-deep);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.feature-card p {
  margin: 0;
  color: var(--dim);
  font-size: 14px;
}

.feature-kbd {
  display: inline-block;
  margin-top: 10px;
  font-size: 11px;
  font-weight: 700;
  color: var(--teal-dark);
  background: var(--mist);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 2px 8px;
}

/* ---------- 三步上手 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  counter-reset: step;
  position: relative;
}

.step {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 22px;
  text-align: center;
}

.step-num {
  width: 36px;
  height: 36px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--teal), var(--teal-deep));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 15px;
}

.step h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.step p {
  margin: 0;
  color: var(--dim);
  font-size: 13.5px;
}

/* ---------- 语言覆盖 ---------- */
.lang-stats {
  display: flex;
  gap: 40px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.lang-stats div strong {
  display: block;
  font-size: 30px;
  color: var(--teal-dark);
}

.lang-stats div span {
  font-size: 13px;
  color: var(--dim);
}

.pill-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.pill {
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--mist);
  border: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink);
}

.pill.pill-rare {
  background: var(--teal-faint);
  border-color: var(--teal-soft);
  color: var(--teal-dark);
  font-weight: 700;
}

/* ---------- 差异化说明 ---------- */
.why-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.why-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow-card);
}

.why-card h3 {
  font-size: 19px;
  margin-bottom: 12px;
}

.why-card p {
  color: var(--dim);
  font-size: 14.5px;
  margin: 0 0 18px;
}

.style-badges {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.style-badge {
  flex: 1;
  min-width: 140px;
  background: var(--mist);
  border-radius: 10px;
  padding: 12px 14px;
}

.style-badge b {
  display: block;
  font-size: 13.5px;
  color: var(--teal-dark);
  margin-bottom: 4px;
}

.style-badge span {
  font-size: 12.5px;
  color: var(--dim);
}

/* ---------- FAQ ---------- */
.faq {
  background: var(--mist);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-list details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 4px 22px;
}

.faq-list summary {
  cursor: pointer;
  list-style: none;
  padding: 18px 0;
  font-weight: 700;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: '+';
  font-size: 20px;
  font-weight: 400;
  color: var(--teal);
  transition: transform 0.15s;
  flex: none;
}

.faq-list details[open] summary::after {
  transform: rotate(45deg);
}

.faq-list p {
  margin: 0 0 18px;
  color: var(--dim);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 底部 CTA ---------- */
.cta-band {
  text-align: center;
  background: linear-gradient(135deg, var(--teal-dark), var(--teal-deep));
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 56px 32px;
}

.cta-band h2 {
  color: #fff;
}

.cta-band p {
  color: rgba(255, 255, 255, 0.82);
  margin: 14px 0 28px;
}

.cta-band .btn-disabled {
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
}

/* ---------- 页脚 ---------- */
footer.site-footer {
  border-top: 1px solid var(--line);
  padding: 56px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}

.footer-grid h4 {
  font-size: 13px;
  color: var(--dim);
  margin: 0 0 14px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.footer-grid ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-grid ul a {
  color: var(--ink);
  font-size: 14px;
}

.footer-grid ul a:hover {
  color: var(--teal-deep);
}

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--dim);
}

/* ---------- 法律文本页（隐私政策 / 用户协议） ---------- */
.legal-hero {
  padding: 56px 0 32px;
  background: var(--mist);
}

.legal-hero .wrap {
  max-width: 820px;
}

.legal-updated {
  color: var(--dim);
  font-size: 13px;
  margin-top: 10px;
}

.legal-disclaimer {
  font-size: 12.5px;
  color: var(--dim);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 16px;
  margin-top: 20px;
}

.legal-body {
  padding: 48px 0 96px;
}

.legal-body .wrap {
  max-width: 820px;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 48px;
  align-items: start;
}

.legal-toc {
  position: sticky;
  top: 96px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.legal-toc a {
  font-size: 13.5px;
  color: var(--dim);
  font-weight: 600;
}

.legal-toc a:hover {
  color: var(--teal-deep);
  text-decoration: none;
}

.legal-article h2 {
  font-size: 20px;
  margin: 40px 0 14px;
  scroll-margin-top: 96px;
}

.legal-article h2:first-child {
  margin-top: 0;
}

.legal-article p,
.legal-article li {
  color: var(--ink);
  font-size: 14.5px;
  line-height: 1.85;
}

.legal-article ul,
.legal-article ol {
  padding-left: 22px;
  margin: 10px 0;
}

.legal-article li {
  margin-bottom: 6px;
}

.legal-article strong {
  color: var(--teal-dark);
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero .wrap {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 34px;
  }

  .feature-grid,
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .why-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .legal-body .wrap {
    grid-template-columns: 1fr;
  }

  .legal-toc {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
  }

  nav.site-nav {
    display: none;
  }
}

@media (max-width: 600px) {
  section {
    padding: 56px 0;
  }

  .feature-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    flex-wrap: wrap;
    row-gap: 16px;
  }
}