/* public/css/index.css —— 首页样式（中英文共用）
   设计系统：Teal 品牌主色 + Orange CTA + 薄荷白背景（ui-ux-pro-max 方案 A） */
@import url("https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap");

:root {
  --brand: #0d9488;
  --brand-hover: #0f766e;
  --brand-soft: #14b8a6;
  --brand-50: #f0fdfa;
  --brand-100: #ccfbf1;
  --brand-200: #99f6e4;
  --brand-950: #042f2e;
  --cta: #ea580c;
  --cta-hover: #c2410c;
  --cta-50: #fff7ed;
  --cta-700: #c2410c;
  --bg: #f0fdfa;
  --card: #ffffff;
  --text: #134e4a;
  --text-secondary: #3e5c58;
  --text-muted: #5c7671;
  --text-faint: #7a908c;
  --border: #d7e7e3;
  --border-strong: #a9c5bf;
  --success: #15803d;
  --error: #b91c1c;
  --radius-sm: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(4, 47, 46, 0.06), 0 6px 18px rgba(4, 47, 46, 0.05);
  --shadow-lg: 0 14px 40px rgba(4, 47, 46, 0.1);
  --font: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: block;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* 顶部导航 */
.site-header {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.logo { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 15px; color: var(--text); text-decoration: none; }
.logo-mark {
  width: 30px; height: 30px; border-radius: 9px;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-soft) 100%);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 800;
  box-shadow: 0 3px 8px rgba(13, 148, 136, 0.35);
}
.header-nav { display: flex; align-items: center; gap: 20px; font-size: 14px; }
.header-nav a { color: var(--text-secondary); text-decoration: none; transition: color 0.2s ease; }
.header-nav a:hover { color: var(--brand); }
.header-nav a.btn-primary { color: #fff; }
.header-nav a.btn-ghost { color: var(--text); }
.header-nav a.btn-primary:hover,
.header-nav a.btn-ghost:hover { color: #fff; }
.nav-links { display: flex; align-items: center; gap: 20px; }

/* 语言切换器 */
.lang-switcher { display: inline-flex; align-items: center; gap: 5px; font-size: 13px; white-space: nowrap; }
.lang-link { color: var(--text-secondary); text-decoration: none; padding: 2px 6px; border-radius: 6px; transition: color 0.2s ease; }
.lang-link:hover { color: var(--brand); }
.lang-link.lang-active { color: var(--brand); font-weight: 700; background: var(--brand-50); }
.lang-sep { color: var(--border-strong); }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  text-decoration: none; border-radius: var(--radius-sm); font-weight: 600;
  cursor: pointer; border: 1px solid transparent;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
  font-family: var(--font);
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--cta); outline-offset: 2px; }
.btn-primary { background: var(--cta); color: #fff; box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3); }
.btn-primary:hover { background: var(--cta-hover); box-shadow: 0 6px 16px rgba(249, 115, 22, 0.38); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border-strong); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); background: var(--brand-50); }
.btn-outline { background: transparent; color: var(--brand); border: 1.5px solid rgba(13, 148, 136, 0.35); box-shadow: none; }
.btn-outline:hover { background: var(--brand); color: #fff; border-color: var(--brand); }
.header-nav a.btn-outline { color: var(--brand); }
.header-nav a.btn-outline:hover { color: #fff; }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-lg { padding: 13px 28px; font-size: 15px; border-radius: 12px; }
.btn-block { display: flex; width: 100%; padding: 11px 0; }

/* Hero */
.hero {
  padding: 96px 0 72px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(520px 260px at 20% 10%, rgba(13, 148, 136, 0.08), transparent 70%),
    radial-gradient(520px 300px at 85% 20%, rgba(249, 115, 22, 0.07), transparent 70%);
  pointer-events: none;
}
.hero .container { position: relative; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--brand-50); border: 1px solid var(--brand-200);
  color: var(--brand-hover); font-size: 12.5px; font-weight: 600;
  padding: 6px 14px; border-radius: 999px; margin-bottom: 20px;
}
.hero-badge svg { width: 14px; height: 14px; }
.hero-title {
  font-size: 46px; line-height: 1.18; margin: 0 0 20px;
  font-weight: 800; letter-spacing: -0.5px;
}
.hero-title .accent { color: var(--brand); }
.hero-sub { font-size: 16.5px; color: var(--text-secondary); max-width: 680px; margin: 0 auto 32px; line-height: 1.8; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-note { margin-top: 22px; font-size: 12.5px; color: var(--text-muted); }

/* Hero 产品可视化（评论气泡 mockup） */
.hero-visual { margin: 56px auto 0; max-width: 760px; position: relative; }
.mock-card {
  background: #fff; border: 1px solid var(--border); border-radius: 18px;
  padding: 22px 26px; text-align: left;
  box-shadow: var(--shadow-lg);
}
.mock-head { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.mock-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--brand-soft));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 15px;
}
.mock-name { font-size: 14px; font-weight: 700; }
.mock-meta { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.mock-chip {
  margin-left: auto; font-size: 11.5px; font-weight: 700; color: var(--brand-hover);
  background: var(--brand-50); border: 1px solid var(--brand-200);
  padding: 4px 10px; border-radius: 999px;
}
.mock-body { font-size: 14px; line-height: 1.75; color: var(--text); }
.mock-body .link { color: var(--brand); font-weight: 600; }
.mock-footer { margin-top: 14px; display: flex; gap: 18px; font-size: 12px; color: var(--text-muted); }
.mock-footer svg { width: 13px; height: 13px; vertical-align: -2px; margin-right: 4px; }
.mock-float {
  position: absolute;
  background: #fff; border: 1px solid var(--border); border-radius: 12px;
  padding: 10px 16px; font-size: 12.5px; font-weight: 600; color: var(--text);
  box-shadow: var(--shadow-lg);
  display: flex; align-items: center; gap: 8px;
  animation: floatY 5s ease-in-out infinite;
}
.mock-float .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success); box-shadow: 0 0 0 3px rgba(21, 128, 61, 0.15); }
.mock-float.f1 { top: -18px; right: -28px; animation-delay: 0s; }
.mock-float.f2 { bottom: -16px; left: -30px; animation-delay: 2.5s; }
@keyframes floatY { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }

/* 分区 */
.section { padding: 64px 0; }
.section-alt { background: #fff; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-title { text-align: center; font-size: 28px; margin: 0 0 8px; font-weight: 800; letter-spacing: -0.3px; }
.section-sub { text-align: center; color: var(--text-muted); font-size: 14.5px; margin: 0 0 38px; }

/* 卡片 */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 26px; box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--brand-200); }
.section-alt .card { background: var(--brand-50); border-color: var(--brand-100); }
.section-alt .card:hover { border-color: var(--brand-200); }
.card-icon {
  width: 44px; height: 44px; border-radius: 12px;
  background: linear-gradient(135deg, var(--brand), var(--brand-soft));
  color: #fff; display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
  box-shadow: 0 4px 10px rgba(13, 148, 136, 0.3);
}
.card-icon svg { width: 22px; height: 22px; }
.card h3 { margin: 0 0 10px; font-size: 16px; font-weight: 700; }
.card p { margin: 0; font-size: 13.5px; color: var(--text-secondary); line-height: 1.75; }

/* 统计数据（Social Proof） */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; max-width: 900px; margin: 0 auto; }
.stat { text-align: center; }
.stat-num { font-size: 32px; font-weight: 800; color: var(--brand); letter-spacing: -0.5px; }
.stat-label { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

/* 用户评价 */
.testimonials { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; max-width: 960px; margin: 0 auto; }
.testimonial {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 22px; box-shadow: var(--shadow-sm);
}
.stars { color: var(--cta); font-size: 15px; letter-spacing: 2px; margin-bottom: 10px; }
.testimonial p { margin: 0 0 14px; font-size: 13.5px; line-height: 1.75; color: var(--text-secondary); }
.testimonial-author { font-size: 12.5px; font-weight: 700; color: var(--text); }
.testimonial-role { font-size: 12px; color: var(--text-muted); }

/* 价格 */
.billing-toggle {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0;
  margin-bottom: 32px;
  background: #f0f4f3;
  border-radius: 999px;
  padding: 4px;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}
.toggle-btn {
  padding: 10px 24px;
  border: none;
  background: transparent;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 999px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 6px;
}
.toggle-btn.active {
  background: var(--cta);
  color: #fff;
  box-shadow: 0 2px 8px rgba(249, 115, 22, 0.3);
}
.save-badge {
  font-size: 11px;
  font-weight: 700;
  background: #10b981;
  color: #fff;
  padding: 2px 8px;
  border-radius: 999px;
}
.plan-content { width: 100%; }
.plan-card { text-align: center; display: flex; flex-direction: column; gap: 12px; }
.plan-featured {
  border-color: var(--cta);
  border-width: 2px;
  box-shadow: 0 16px 44px rgba(249, 115, 22, 0.18);
}
.plan-badge {
  align-self: center;
  background: var(--cta); color: #fff;
  font-size: 11px; font-weight: 800; letter-spacing: 0.4px;
  padding: 4px 12px; border-radius: 999px;
  text-transform: uppercase;
}
.price { font-size: 34px; font-weight: 800; margin: 2px 0 0; letter-spacing: -0.5px; }
.price-unit { font-size: 13px; color: var(--text-muted); font-weight: 400; }
.plan-list { list-style: none; padding: 0; margin: 0 0 8px; text-align: left; font-size: 13.5px; color: var(--text-secondary); line-height: 2; }
.plan-list li::before { content: "✓"; color: var(--brand); margin-right: 9px; font-weight: 800; }
/* Credit Packs 每行选项：左名称 + 右价格按钮 */
.plan-list.credit-options li { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.plan-list.credit-options li::before { content: none; }
.plan-list.credit-options .btn { margin: 0; min-width: 68px; padding: 5px 12px; }

/* 最终 CTA 区块 */
.final-cta {
  background: linear-gradient(135deg, var(--brand-950) 0%, #06403d 100%);
  color: #fff; text-align: center; padding: 72px 24px;
}
.final-cta h2 { font-size: 30px; font-weight: 800; margin: 0 0 12px; letter-spacing: -0.3px; }
.final-cta p { color: rgba(255, 255, 255, 0.75); font-size: 15px; margin: 0 auto 30px; max-width: 560px; line-height: 1.7; }

/* FAQ */
.faq-list { max-width: 740px; margin: 0 auto; }
.faq-item {
  background: #fff; border: 1px solid var(--border); border-radius: 12px;
  padding: 16px 20px; margin-bottom: 12px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.faq-item[open] { border-color: var(--brand-200); box-shadow: var(--shadow-sm); }
.faq-item summary {
  cursor: pointer; font-weight: 600; font-size: 14.5px; list-style: none;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; font-size: 19px; font-weight: 700; color: var(--brand);
  transition: transform 0.25s ease; flex-shrink: 0; line-height: 1;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { font-size: 13.5px; color: var(--text-secondary); line-height: 1.85; margin: 12px 0 0; }

/* 底部 */
.site-footer { background: var(--brand-950); color: var(--text-faint); padding: 30px 0; margin-top: 40px; font-size: 13px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px 24px; }
.footer-inner a { color: var(--border); text-decoration: none; transition: color 0.2s ease; }
.footer-inner a:hover { color: #fff; }
.footer-links { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; }
.footer-links a { color: rgba(255, 255, 255, 0.7); }
.footer-links a:hover { color: #fff; }

/* 通用内容页（about/contact/privacy/terms） */
.page-content { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 40px; box-shadow: var(--shadow-sm); max-width: 760px; margin: 0 auto; }
.page-content h1 { font-size: 26px; margin: 0 0 20px; font-weight: 800; letter-spacing: -0.3px; }
.page-content h2 { font-size: 17px; margin: 28px 0 10px; font-weight: 700; }
.page-content p { font-size: 14px; line-height: 1.8; color: var(--text-secondary); margin: 0 0 14px; }
.page-content ul { margin: 0 0 14px; padding-left: 20px; color: var(--text-secondary); font-size: 14px; line-height: 1.8; }
.page-content a { color: var(--brand); text-decoration: none; }
.page-content a:hover { text-decoration: underline; }

/* 响应式 */
@media (max-width: 900px) {
  .testimonials { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 26px 16px; }
  .hero-title { font-size: 34px; }
  .mock-float { display: none; }
}
@media (max-width: 720px) {
  .header-inner { height: 58px; padding: 0 16px; }
  .header-nav { gap: 8px; }
  .header-nav .nav-links { display: none; }
  .header-nav .btn-sm { padding: 5px 10px; font-size: 12px; }
  .logo-mark { width: 26px; height: 26px; font-size: 11px; }
  .logo span:last-child { display: none; }
  .hero { padding: 72px 0 56px; }
  .hero-title { font-size: 29px; }
  .hero-sub { font-size: 15px; }
  .section { padding: 48px 0; }
  .section-title { font-size: 24px; }
  .final-cta h2 { font-size: 24px; }
  .final-cta .btn-lg { padding: 11px 20px; font-size: 14px; }
  .footer-inner { flex-direction: column; text-align: center; gap: 14px; }
  .footer-links { justify-content: center; }
}

/* 无障碍：减少动效 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

/* ===== 安装指南页（/install.html · /zh/install.html） ===== */
.header-nav .nav-links a.nav-active { color: var(--brand); font-weight: 700; }
.install-page { padding: 52px 0 72px; }
.install-wrap { max-width: 860px; margin: 0 auto; padding: 0 20px; }

.install-hero { text-align: center; margin-bottom: 36px; }
.install-hero h1 { margin: 0 0 12px; font-size: 36px; }
.install-sub { margin: 0 auto; max-width: 580px; color: var(--text-secondary); font-size: 16px; line-height: 1.7; }
.page-eyebrow { display: inline-block; margin-bottom: 16px; padding: 5px 14px; font-size: 12px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--brand); background: var(--brand-50); border: 1px solid var(--brand-100); border-radius: 999px; }

.dl-card { display: flex; align-items: center; gap: 20px; margin-bottom: 14px; padding: 22px 26px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }
.dl-icon { flex-shrink: 0; display: flex; align-items: center; justify-content: center; width: 52px; height: 52px; color: var(--brand); background: var(--brand-50); border: 1px solid var(--brand-100); border-radius: 14px; }
.dl-info { flex: 1; min-width: 0; }
.dl-name { margin: 0 0 4px; font-size: 17px; }
.dl-desc { margin: 0; color: var(--text-muted); font-size: 13.5px; line-height: 1.6; }
.dl-btn { flex-shrink: 0; white-space: nowrap; }
.dl-note { margin: 0 0 46px; color: var(--text-faint); font-size: 13px; line-height: 1.7; }

.guide h2 { margin: 0 0 26px; font-size: 26px; }
.steps { display: grid; gap: 18px; margin: 0; padding: 0; list-style: none; }
.step { display: flex; gap: 18px; padding: 22px 24px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }
.step-num { flex-shrink: 0; display: flex; align-items: center; justify-content: center; width: 34px; height: 34px; border-radius: 50%; background: var(--brand); color: #fff; font-size: 15px; font-weight: 700; }
.step-body { flex: 1; min-width: 0; }
.step-body h3 { margin: 0 0 8px; font-size: 17px; }
.step-body p { margin: 0 0 14px; color: var(--text-secondary); font-size: 14.5px; line-height: 1.7; }
.step-body code { padding: 2px 7px; color: var(--brand-950); background: var(--brand-50); border: 1px solid var(--brand-100); border-radius: 6px; font-size: 13px; }

.step-img { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; min-height: 150px; padding: 20px; text-align: center; color: var(--text-faint); background: #fbfdfc; border: 2px dashed var(--border-strong); border-radius: 12px; font-size: 13px; }
.step-img svg { opacity: 0.55; }

.step-img--photo { padding: 0; background: transparent; border: none; border-radius: 0; min-height: auto; }
.step-img--photo img { display: block; width: 100%; max-width: 520px; height: auto; margin: 0 auto; border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow-sm); }
.step-img--photo figcaption { margin-top: 10px; color: var(--text-muted); font-size: 12.5px; text-align: center; }

.tips { margin-top: 44px; padding: 26px 28px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }
.tips h2 { margin: 0 0 16px; font-size: 22px; }
.tips ul { margin: 0; padding-left: 20px; color: var(--text-secondary); font-size: 14.5px; line-height: 1.8; }
.tips li { margin-bottom: 8px; }
.tips code { padding: 1px 6px; color: var(--brand-950); background: var(--brand-50); border: 1px solid var(--brand-100); border-radius: 6px; font-size: 13px; }

.install-cta { margin-top: 48px; text-align: center; }
.install-cta h2 { margin: 0 0 16px; font-size: 24px; }

@media (max-width: 720px) {
  .install-page { padding: 40px 0 56px; }
  .install-hero h1 { font-size: 28px; }
  .dl-card { flex-direction: column; align-items: stretch; text-align: center; }
  .dl-icon { margin: 0 auto; }
  .dl-btn { width: 100%; text-align: center; }
  .step { padding: 18px 16px; gap: 12px; }
  .step-num { width: 30px; height: 30px; font-size: 14px; }
  .tips { padding: 20px 18px; }
}

/* ===== 使用指南页（/guide.html · /zh/guide.html） ===== */
.guide-page { padding: 52px 0 72px; }
.guide-wrap { max-width: 860px; margin: 0 auto; padding: 0 20px; }
.guide-hero { text-align: center; margin-bottom: 40px; }
.guide-hero h1 { margin: 0 0 12px; font-size: 36px; }
.guide-lead { margin: 0 auto; max-width: 620px; color: var(--text-secondary); font-size: 16px; line-height: 1.7; }
.guide-lead a { color: var(--brand); }

.toc { margin-bottom: 44px; padding: 22px 28px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }
.toc h2 { margin: 0 0 14px; font-size: 17px; }
.toc ol { margin: 0; padding-left: 22px; color: var(--text-secondary); font-size: 14.5px; line-height: 1.95; }
.toc a { color: var(--brand); text-decoration: none; }
.toc a:hover { text-decoration: underline; }

.doc-section { margin-bottom: 48px; }
.doc-section h2 { margin: 0 0 16px; font-size: 24px; }
.doc-section p { margin: 0 0 12px; color: var(--text-secondary); font-size: 15px; line-height: 1.8; }
.doc-section a { color: var(--brand); }
.doc-section ul, .doc-section ol { margin: 0 0 16px; padding-left: 22px; color: var(--text-secondary); font-size: 14.5px; line-height: 1.8; }
.doc-section li { margin-bottom: 7px; }
.doc-section li ul { margin-top: 6px; margin-bottom: 6px; }
.doc-section code { padding: 2px 7px; color: var(--brand-950); background: var(--brand-50); border: 1px solid var(--brand-100); border-radius: 6px; font-size: 13px; }

.doc-note { padding: 14px 18px; background: var(--brand-50); border-left: 4px solid var(--brand); border-radius: 8px; color: var(--brand-950); font-size: 14px; line-height: 1.7; }
.doc-section .doc-note { margin: 18px 0; }

.doc-figure { margin: 22px 0; }
.doc-figure img { display: block; width: 100%; height: auto; border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow-sm); }
.doc-figure figcaption { margin-top: 10px; color: var(--text-muted); font-size: 13px; text-align: center; }

@media (max-width: 720px) {
  .guide-page { padding: 40px 0 56px; }
  .guide-hero h1 { font-size: 28px; }
  .toc { padding: 18px 20px; }
  .doc-section h2 { font-size: 21px; }
  .doc-figure img { border-radius: 10px; }
}