/* ==========================================================================
 * 灯塔工作室 - shadcn/ui 单色设计系统
 * ========================================================================== */
:root {
  /* ---- Colors ---- */
  --color-canvas: #f5f5f5;
  --color-paper: #ffffff;
  --color-surface-alt: #fafafa;
  --color-ink: #0a0a0a;
  --color-ink-soft: #171717;
  --color-mid-gray: #737373;
  --color-hairline: #e5e5e5;
  --color-ember: #e7000b;

  /* ---- Typography ---- */
  --font-geist: "Geist", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, sans-serif;

  --text-caption: 12px;
  --leading-caption: 1.33;
  --tracking-caption: 0.6px;
  --text-body: 14px;
  --leading-body: 1.43;
  --text-body-lg: 16px;
  --leading-body-lg: 1.5;
  --text-subheading: 18px;
  --leading-subheading: 1.56;
  --text-heading-sm: 24px;
  --leading-heading-sm: 1.33;
  --tracking-heading-sm: -0.6px;
  --text-heading: 30px;
  --leading-heading: 1.2;
  --tracking-heading: -0.75px;
  --text-heading-lg: 36px;
  --leading-heading-lg: 1.11;
  --tracking-heading-lg: -0.9px;
  --text-display: 48px;
  --leading-display: 1.1;
  --tracking-display: -2.4px;

  /* ---- Spacing ---- */
  --sp-4: 4px;
  --sp-8: 8px;
  --sp-12: 12px;
  --sp-16: 16px;
  --sp-20: 20px;
  --sp-24: 24px;
  --sp-48: 48px;

  /* ---- Radius ---- */
  --radius-cards: 24px;
  --radius-small: 6px;
  --radius-badges: 18px;
  --radius-inputs: 18px;
  --radius-nested: 10px;
  --radius-buttons: 18px;

  /* ---- Shadow ---- */
  --shadow-card: 0 0 0 1px rgba(23, 23, 23, 0.05), 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-lift: 0 0 0 1px rgba(23, 23, 23, 0.06), 0 10px 30px rgba(0, 0, 0, 0.10), 0 4px 8px -2px rgba(0, 0, 0, 0.06);

  --page-max-width: 1280px;
}

/* ===================== 基础 ===================== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-geist);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-ink);
  background: var(--color-canvas);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  user-select: text;
  -webkit-user-select: text;
}
body *, body *::before, body *::after { user-select: text; -webkit-user-select: text; }

.container { max-width: var(--page-max-width); margin: 0 auto; padding: 0 28px; }
a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3, h4 { letter-spacing: -0.025em; }

.ic { vertical-align: middle; flex-shrink: 0; }
.ic.filled { fill: currentColor; }

/* ===================== 按钮 ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-8);
  height: 36px;
  padding: 0 16px;
  border-radius: var(--radius-buttons);
  font-size: var(--text-body);
  font-weight: 500;
  border: none;
  white-space: nowrap;
  transition: background .2s ease, color .2s ease, box-shadow .2s ease, transform .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-lg { height: 44px; padding: 0 24px; font-size: 16px; }

/* 主按钮：墨色反白，系统里唯一的强调处理 */
.btn-solid { background: var(--color-ink); color: #fafafa; }
.btn-solid:hover { background: var(--color-ink-soft); }
.btn-solid:active { background: var(--color-ink); }

/* 幽灵按钮：画布灰填充 */
.btn-ghost { background: var(--color-canvas); color: var(--color-ink); }
.btn-ghost:hover { background: #ebebeb; }
.btn-ghost:active { background: var(--color-canvas); }

/* 描边按钮：发丝线边框 */
.btn-outline { background: transparent; color: var(--color-ink); box-shadow: inset 0 0 0 1px var(--color-hairline); }
.btn-outline:hover { box-shadow: inset 0 0 0 1px var(--color-ink); }
.btn-outline:active { box-shadow: inset 0 0 0 1px var(--color-hairline); }

.btn-block { width: 100%; }

/* ===================== 徽章 ===================== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 22px;
  padding: 0 10px;
  border-radius: var(--radius-badges);
  font-size: var(--text-caption);
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
}
.badge-solid { background: var(--color-ink-soft); color: #fafafa; }
.badge-soft { background: var(--color-canvas); color: var(--color-ink-soft); }
.badge-outline { background: transparent; color: var(--color-ink); box-shadow: inset 0 0 0 1px var(--color-hairline); }

/* ===================== 导航栏 ===================== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(245, 245, 245, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .3s, border-color .3s;
}
.navbar.scrolled { box-shadow: 0 1px 0 rgba(0,0,0,0.06); border-bottom-color: var(--color-hairline); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: inline-flex; align-items: center; gap: var(--sp-8); font-weight: 600; font-size: 16px; }
.logo-mark { display: inline-flex; width: 28px; height: 28px; align-items: center; justify-content: center; border-radius: 8px; background: var(--color-ink); color: #fff; transition: transform .3s; }
.logo:hover .logo-mark { transform: rotate(-8deg) scale(1.05); }
.nav-links { display: flex; gap: var(--sp-24); }
.nav-links a { position: relative; font-size: var(--text-body); color: var(--color-mid-gray); font-weight: 500; padding: 6px 0; transition: color .2s; }
.nav-links a::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--color-ink); transform: scaleX(0); transform-origin: left; transition: transform .25s ease; }
.nav-links a:hover { color: var(--color-ink); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-toggle { display: none; background: none; border: none; color: var(--color-ink); }

/* ===================== Hero ===================== */
.hero { padding: 140px 0 64px; position: relative; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}
.hero-badge { margin-bottom: var(--sp-20); animation: fadeUp .6s ease both; }
.hero-title {
  font-size: var(--text-display);
  line-height: var(--leading-display);
  letter-spacing: var(--tracking-display);
  font-weight: 600;
  margin-bottom: var(--sp-20);
  animation: fadeUp .6s .06s ease both;
}
.hero-sub { font-size: var(--text-body-lg); line-height: var(--leading-body-lg); color: var(--color-mid-gray); max-width: 520px; margin-bottom: var(--sp-20); animation: fadeUp .6s .12s ease both; }
.hero-rating { display: flex; align-items: center; gap: var(--sp-12); margin-bottom: var(--sp-24); animation: fadeUp .6s .18s ease both; }
.stars { display: inline-flex; gap: 2px; color: var(--color-ink); }
.stars svg { width: 15px; height: 15px; }
.rating-text { font-size: var(--text-body); color: var(--color-mid-gray); }
.rating-text b { color: var(--color-ink); font-weight: 600; }
.hero-actions { display: flex; gap: var(--sp-12); flex-wrap: wrap; animation: fadeUp .6s .24s ease both; }
.hero-trust { display: flex; gap: var(--sp-8); flex-wrap: wrap; margin-top: var(--sp-24); animation: fadeUp .6s .3s ease both; }
.trust-chip {
  display: inline-flex; align-items: center; gap: 6px;
  height: 30px; padding: 0 12px;
  border-radius: var(--radius-badges);
  background: var(--color-paper);
  box-shadow: inset 0 0 0 1px var(--color-hairline);
  font-size: var(--text-body);
  color: var(--color-ink);
  transition: box-shadow .2s;
}
.trust-chip .ic { color: var(--color-mid-gray); }
.trust-chip:hover { box-shadow: inset 0 0 0 1px var(--color-ink); }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- 产品展示组件卡片 ---- */
.hero-right { animation: fadeUp .6s .18s ease both; }
.showcase {
  padding: 0;
  overflow: hidden;
}
.showcase-bar {
  display: flex; align-items: center; gap: 6px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-hairline);
  background: var(--color-surface-alt);
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--color-hairline); }
.showcase-addr { flex: 1; text-align: center; font-size: var(--text-caption); color: var(--color-mid-gray); }
.showcase-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; padding: 16px; }

.showcase-item {
  display: flex; flex-direction: column; align-items: flex-start; gap: 8px;
  padding: 14px;
  background: var(--color-paper);
  box-shadow: inset 0 0 0 1px var(--color-hairline);
  border-radius: var(--radius-nested);
  border: none;
  text-align: left;
  transition: box-shadow .2s, transform .15s;
}
.showcase-item:hover { box-shadow: inset 0 0 0 1px var(--color-ink); transform: translateY(-2px); }
.showcase-icon { display: inline-flex; width: 32px; height: 32px; align-items: center; justify-content: center; border-radius: 8px; background: var(--color-canvas); color: var(--color-ink); }
.showcase-item .ic { width: 16px; height: 16px; }
.showcase-name { font-size: 12.5px; font-weight: 500; color: var(--color-ink); line-height: 1.3; }
.showcase-dl {
  margin-top: auto;
  display: inline-flex; align-items: center; gap: 4px;
  height: 24px; padding: 0 10px;
  border-radius: var(--radius-badges);
  background: var(--color-ink); color: #fafafa;
  font-size: 11.5px; font-weight: 500;
  opacity: 0; transform: translateY(4px);
  transition: opacity .2s, transform .2s;
}
.showcase-item:hover .showcase-dl { opacity: 1; transform: translateY(0); }

/* ---- Hero 数据 ---- */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-24);
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--color-hairline);
  animation: fadeUp .6s .36s ease both;
}
.stat { text-align: center; }
.stat-value { font-size: var(--text-heading); line-height: var(--leading-heading); letter-spacing: var(--tracking-heading); font-weight: 600; color: var(--color-ink); }
.stat-label { font-size: var(--text-caption); letter-spacing: var(--tracking-caption); text-transform: uppercase; color: var(--color-mid-gray); margin-top: 2px; }

/* ===================== 通用 Section ===================== */
.section { padding: 88px 0; scroll-margin-top: 64px; }
.section-alt { background: var(--color-paper); border-top: 1px solid var(--color-hairline); border-bottom: 1px solid var(--color-hairline); }
.section-head { text-align: center; margin-bottom: 48px; }
.section-title { font-size: var(--text-heading-lg); line-height: var(--leading-heading-lg); letter-spacing: var(--tracking-heading-lg); font-weight: 600; margin-bottom: 8px; }
.section-sub { font-size: var(--text-body-lg); color: var(--color-mid-gray); }

/* 滚动显现 */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===================== Card 基类 ===================== */
.card {
  background: var(--color-paper);
  border-radius: var(--radius-cards);
  box-shadow: var(--shadow-card);
  padding: var(--sp-20);
}

/* ===================== 工具大卡片 ===================== */
.tools-list { display: flex; flex-direction: column; gap: var(--sp-24); }
.tool-card {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  background: var(--color-paper);
  border-radius: var(--radius-cards);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow .3s ease, transform .3s ease;
}
.tool-card:hover { box-shadow: var(--shadow-lift); transform: translateY(-3px); }

.tool-card-left { padding: 32px; display: flex; flex-direction: column; }
.tool-card-meta { display: flex; align-items: center; gap: var(--sp-8); margin-bottom: var(--sp-16); flex-wrap: wrap; }
.tool-name { font-size: var(--text-heading-sm); line-height: var(--leading-heading-sm); letter-spacing: var(--tracking-heading-sm); font-weight: 600; margin-bottom: 6px; }
.tool-tagline { font-size: var(--text-body); color: var(--color-mid-gray); margin-bottom: var(--sp-16); }
.tool-desc { font-size: var(--text-body); color: var(--color-ink); margin-bottom: var(--sp-20); }
.tool-feats { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 20px; list-style: none; margin-bottom: var(--sp-24); }
.tool-feats li { display: flex; align-items: flex-start; gap: 8px; font-size: var(--text-body); color: var(--color-ink); }
.tool-feats li .ic { width: 15px; height: 15px; margin-top: 3px; color: var(--color-ink); }
.tool-downloads { display: flex; gap: var(--sp-8); flex-wrap: wrap; margin-top: auto; }

/* 工具卡右侧：单色界面 mockup */
.tool-card-right { display: flex; align-items: center; justify-content: center; padding: 24px; background: var(--color-canvas); border-left: 1px solid var(--color-hairline); }
.mock {
  width: 100%; max-width: 340px;
  background: var(--color-paper);
  border-radius: var(--radius-nested);
  box-shadow: var(--shadow-card);
  padding: 16px;
}
.mock-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 12px; }
.mock-title { display: inline-flex; align-items: center; gap: 8px; font-size: var(--text-body); font-weight: 600; }
.mock-title .ic { width: 16px; height: 16px; }
.mock-body { display: flex; flex-direction: column; gap: 8px; }
.mock-line { height: 12px; border-radius: 6px; background: var(--color-surface-alt); box-shadow: inset 0 0 0 1px var(--color-hairline); position: relative; overflow: hidden; }
.mock-line::after {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0;
  width: 0; background: var(--color-hairline);
  border-radius: 6px;
  transition: width 1s ease;
}
.tool-card:hover .mock-line::after { width: 100%; }
.mock-line.s1 { width: 100%; } .mock-line.s2 { width: 82%; } .mock-line.s3 { width: 60%; }
.mock-actions { display: flex; gap: 6px; margin-top: 8px; }
.mock-pill {
  height: 26px; padding: 0 12px;
  display: inline-flex; align-items: center; gap: 6px;
  border-radius: var(--radius-badges);
  font-size: var(--text-caption); font-weight: 500;
}
.mock-pill.solid { background: var(--color-ink); color: #fafafa; }
.mock-pill.soft { background: var(--color-canvas); color: var(--color-ink-soft); }
.mock-note { margin-top: 12px; padding-top: 10px; border-top: 1px solid var(--color-hairline); display: flex; justify-content: space-between; font-size: 11.5px; color: var(--color-mid-gray); }

/* ===================== 功能特性 ===================== */
.features-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: var(--sp-16); }
.feature-card {
  background: var(--color-paper);
  border-radius: var(--radius-cards);
  box-shadow: var(--shadow-card);
  padding: var(--sp-20);
  transition: box-shadow .25s, transform .25s;
}
.feature-card:hover { box-shadow: var(--shadow-lift); transform: translateY(-3px); }
.feature-icon { display: inline-flex; width: 44px; height: 44px; align-items: center; justify-content: center; border-radius: var(--radius-nested); background: var(--color-canvas); color: var(--color-ink); margin-bottom: var(--sp-16); transition: transform .25s; }
.feature-icon .ic { width: 20px; height: 20px; }
.feature-card:hover .feature-icon { transform: scale(1.08); }
.feature-title { font-size: var(--text-subheading); font-weight: 600; margin-bottom: 6px; }
.feature-desc { font-size: var(--text-body); color: var(--color-mid-gray); }

/* ===================== FAQ ===================== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--color-paper);
  border-radius: var(--radius-cards);
  box-shadow: var(--shadow-card);
  margin-bottom: var(--sp-12);
  overflow: hidden;
  transition: box-shadow .25s;
}
.faq-item.open { box-shadow: var(--shadow-lift); }
.faq-q {
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp-16);
  padding: var(--sp-16) var(--sp-20);
  cursor: pointer;
  font-size: var(--text-body);
  font-weight: 500;
  color: var(--color-ink);
  transition: color .2s;
}
.faq-q:hover { color: var(--color-ink); }
.faq-q .chevron { transition: transform .3s ease; color: var(--color-mid-gray); }
.faq-q .chevron svg { width: 16px; height: 16px; }
.faq-item.open .chevron { transform: rotate(180deg); color: var(--color-ink); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .35s cubic-bezier(0.4,0,0.2,1); }
.faq-a p { padding: 0 var(--sp-20) var(--sp-16); color: var(--color-mid-gray); font-size: var(--text-body); }

/* ===================== 底部 CTA ===================== */
.cta { padding: 88px 0; text-align: center; }
.cta-title { font-size: var(--text-heading-lg); line-height: var(--leading-heading-lg); letter-spacing: var(--tracking-heading-lg); font-weight: 600; margin-bottom: 8px; }
.cta-sub { font-size: var(--text-body); color: var(--color-mid-gray); margin-bottom: var(--sp-20); }

/* ===================== 页脚 ===================== */
.footer { background: var(--color-ink); color: #a3a3a3; padding: 56px 0 28px; }
.footer-inner { display: grid; grid-template-columns: 1.4fr 1fr; gap: var(--sp-24); align-items: start; }
.footer-brand { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.footer-brand .logo-mark { background: #fff; color: var(--color-ink); }
.footer-brand .logo-text { color: #fafafa; font-weight: 600; font-size: 16px; }
.footer-brand p { font-size: var(--text-body); color: #737373; margin-top: 2px; }
.footer-links { display: flex; flex-direction: column; gap: var(--sp-12); align-items: flex-end; }
.footer-links a { font-size: var(--text-body); color: #a3a3a3; transition: color .2s; }
.footer-links a:hover { color: #fafafa; }
.footer-copy { grid-column: 1 / -1; text-align: center; margin-top: var(--sp-24); padding-top: var(--sp-20); border-top: 1px solid rgba(255,255,255,0.08); font-size: var(--text-caption); color: #525252; }

/* ===================== 弹窗 ===================== */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(10, 10, 10, 0.4);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: flex; align-items: center; justify-content: center;
  padding: var(--sp-24);
  opacity: 0;
  transition: opacity .25s;
  pointer-events: none;
}
.modal-overlay[hidden] { display: none; }
.modal-overlay.show { opacity: 1; pointer-events: auto; }
.modal {
  position: relative;
  max-width: 860px; width: 100%;
  background: var(--color-paper);
  border-radius: var(--radius-cards);
  box-shadow: var(--shadow-lift);
  transform: translateY(18px) scale(0.985);
  transition: transform .3s cubic-bezier(0.34,1.56,0.64,1);
}
.modal-overlay.show .modal { transform: translateY(0) scale(1); }
.modal-body {
  max-height: 88vh;
  overflow-y: auto;
  padding: var(--sp-20);
  border-radius: var(--radius-cards);
  scrollbar-width: thin;
  scrollbar-color: var(--color-hairline) transparent;
}
.modal-body::-webkit-scrollbar { width: 8px; }
.modal-body::-webkit-scrollbar-track { background: transparent; }
.modal-body::-webkit-scrollbar-thumb {
  background: var(--color-hairline);
  border-radius: 8px;
  border: 2px solid var(--color-paper);
}
.modal-body::-webkit-scrollbar-thumb:hover { background: #d4d4d4; }

/* 关闭按钮：悬浮于弹窗右上角，不占内容流 */
.modal-close {
  position: absolute;
  top: 16px; right: 16px;
  z-index: 2;
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--color-canvas);
  box-shadow: var(--shadow-card);
  border: none;
  color: var(--color-mid-gray);
  transition: color .2s, background .2s, transform .2s;
}
.modal-close:hover { color: var(--color-ember); background: #fde8ea; transform: rotate(90deg); }

.md-head { display: flex; align-items: flex-start; gap: var(--sp-16); margin-bottom: var(--sp-20); padding-right: 44px; }
.md-icon { display: inline-flex; width: 52px; height: 52px; align-items: center; justify-content: center; border-radius: var(--radius-nested); background: var(--color-canvas); color: var(--color-ink); flex-shrink: 0; }
.md-icon .ic { width: 24px; height: 24px; }
.md-title { font-size: var(--text-heading-sm); line-height: var(--leading-heading-sm); letter-spacing: var(--tracking-heading-sm); font-weight: 600; }
.md-tagline { color: var(--color-mid-gray); font-size: var(--text-body); margin-top: 2px; }
.md-section-title { font-size: var(--text-subheading); font-weight: 600; margin: var(--sp-24) 0 var(--sp-12); }
.md-desc { color: var(--color-mid-gray); font-size: var(--text-body); }
.md-feats { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 20px; list-style: none; margin-top: 4px; }
.md-feats li { display: flex; align-items: flex-start; gap: 8px; font-size: var(--text-body); }
.md-feats li .ic { width: 15px; height: 15px; margin-top: 3px; color: var(--color-ink); }
.md-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-12); margin: var(--sp-20) 0; }
.md-stat { background: var(--color-canvas); border-radius: var(--radius-nested); padding: var(--sp-16); text-align: center; }
.md-stat-value { font-size: var(--text-heading); line-height: var(--leading-heading); letter-spacing: var(--tracking-heading); font-weight: 600; }
.md-stat-label { font-size: var(--text-caption); letter-spacing: var(--tracking-caption); text-transform: uppercase; color: var(--color-mid-gray); }
.md-downloads { display: flex; flex-wrap: wrap; gap: var(--sp-12); }
.md-download { flex: 1; min-width: 170px; }
.md-download-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%; height: 40px;
  border-radius: var(--radius-buttons);
  background: var(--color-ink); color: #fafafa;
  font-size: var(--text-body); font-weight: 500;
  transition: background .2s;
}
.md-download-btn:hover { background: var(--color-ink-soft); }
.md-download-note { font-size: var(--text-caption); color: var(--color-mid-gray); text-align: center; margin-top: 6px; }
.md-version {
  box-shadow: var(--shadow-card);
  border-radius: var(--radius-nested);
  padding: 14px 16px;
  margin-bottom: 8px;
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp-16);
}
.md-version-info { font-size: var(--text-body); }
.md-version-info b { font-weight: 600; }
.md-version-info span { color: var(--color-mid-gray); margin-left: 8px; font-size: var(--text-caption); }
.md-version ul { margin-top: 6px; padding-left: 20px; color: var(--color-mid-gray); font-size: var(--text-body); }
.md-version-dl { color: var(--color-ink); font-weight: 500; font-size: var(--text-body); white-space: nowrap; }

/* ===================== 空状态 ===================== */
.empty { text-align: center; color: var(--color-mid-gray); padding: var(--sp-24); }

/* ===================== 响应式 ===================== */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero-title { font-size: 38px; letter-spacing: -1px; }
  .tool-card { grid-template-columns: 1fr; }
  .tool-card-right { border-left: none; border-top: 1px solid var(--color-hairline); }
  .hero-stats { gap: var(--sp-16); }
}
@media (max-width: 720px) {
  .nav-links {
    position: fixed; top: 64px; left: 0; right: 0;
    background: var(--color-paper);
    flex-direction: column;
    padding: var(--sp-16) var(--sp-24); gap: var(--sp-12);
    border-bottom: 1px solid var(--color-hairline);
    box-shadow: var(--shadow-lift);
    transform: translateY(-150%);
    transition: transform .3s;
    z-index: 99;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-toggle { display: inline-flex; }
  .nav-cta { display: none; }
  .tool-card-left { padding: var(--sp-20); }
  .tool-feats { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { align-items: flex-start; }
  .md-feats { grid-template-columns: 1fr; }
  .md-stats { grid-template-columns: repeat(2, 1fr); }
  .section-title { font-size: 28px; }
}