/* ============================================================
   吐司 (Tusi) 专题网站 — 共享样式
   风格还原自官网 https://tusi.qq.com/ 与文档中心 wiki.tusi.qq.com
   配色：白底 / 黑字 / 品牌黄 #FFE345 / 灰阶 #494949 #787878 #FBFBFB
   ============================================================ */

:root {
  --black: #000;
  --white: #fff;
  --yellow: #FFE345;
  --yellow-soft: #FFF6C9;
  --text-1: #000;
  --text-2: #494949;
  --text-3: #787878;
  --bg: #fff;
  --bg-light: #FBFBFB;
  --bg-gray: #F6F6F6;
  --border: #F0F0F0;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-pill: 999px;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
  --font: "Noto Sans CJK SC", "PingFang SC", "Helvetica Neue", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text-1);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font);
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: transform .15s ease, box-shadow .15s ease, opacity .15s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); opacity: .92; }

.btn-dark {
  background: var(--black);
  color: var(--white);
  border-radius: var(--radius-pill);
  padding: 14px 40px;
  font-size: 17px;
}
.btn-dark:hover { box-shadow: 0 6px 20px rgba(0,0,0,.25); }

.btn-sm { padding: 9px 22px; font-size: 14px; border-radius: var(--radius-pill); }
.btn-ghost {
  background: transparent;
  color: var(--black);
  border: 1.5px solid var(--black);
  border-radius: var(--radius-pill);
  padding: 12px 34px;
  font-size: 16px;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: 700;
}
.brand img { width: 40px; height: 40px; border-radius: 10px; }
.main-nav { display: flex; align-items: center; gap: 30px; font-size: 15px; color: var(--text-2); }
.main-nav a:hover { color: var(--black); }
.nav-cta { display: flex; align-items: center; gap: 14px; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(180deg, var(--bg-light), var(--bg));
  padding: 60px 0 72px;
  overflow: hidden;
}
.hero-inner {
  display: flex;
  align-items: center;
  gap: 40px;
}
.hero-text { flex: 1; }
.hero-text h1 { font-size: 76px; font-weight: 800; line-height: 1; letter-spacing: 2px; }
.hero-slogan {
  font-size: 46px;
  font-weight: 800;
  line-height: 1.25;
  margin: 20px 0 36px;
}
.hero-slogan em { font-style: normal; color: #000; }
.download-group { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-visual { flex: 1; position: relative; display: flex; justify-content: center; align-items: center; }
.hero-phone {
  width: 280px;
  border-radius: 34px;
  box-shadow: var(--shadow);
  border: 8px solid #0d0d0d;
  background: #fff;
}
.hero-mascot {
  position: absolute;
  right: -14px;
  bottom: -26px;
  width: 200px;
  filter: drop-shadow(0 10px 18px rgba(0,0,0,.12));
  animation: float 4s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---------- 章节通用 ---------- */
.section { padding: 84px 0; }
.section-alt { background: var(--bg-light); }
.section-head { text-align: center; margin-bottom: 52px; }
.section-head .tag {
  display: inline-block;
  background: var(--yellow);
  color: var(--black);
  font-size: 13px;
  font-weight: 700;
  padding: 5px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
}
.section-head h2 { font-size: 38px; font-weight: 800; line-height: 1.3; }
.section-head p { color: var(--text-3); margin-top: 12px; font-size: 16px; }

/* ---------- 项目介绍（About） ---------- */
.about-lead {
  max-width: 860px;
  margin: 0 auto 56px;
  text-align: center;
  font-size: 18px;
  color: var(--text-2);
  line-height: 2;
}
.adv-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 64px; }
.adv-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow);
  transition: transform .2s ease;
}
.adv-card:hover { transform: translateY(-4px); }
.adv-card .adv-icon { font-size: 34px; margin-bottom: 16px; }
.adv-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.adv-card p { font-size: 15px; color: var(--text-2); line-height: 1.8; }

.ability-block { max-width: 980px; margin: 0 auto; }
.ability-block h3 { font-size: 24px; font-weight: 700; margin-bottom: 24px; text-align: center; }
.table-wrap { overflow-x: auto; border-radius: var(--radius-lg); border: 1px solid var(--border); box-shadow: var(--shadow); }
table { width: 100%; border-collapse: collapse; background: var(--white); min-width: 640px; }
th, td { padding: 14px 18px; text-align: left; font-size: 15px; border-bottom: 1px solid var(--border); }
thead th { background: var(--bg-light); font-weight: 700; font-size: 14px; color: var(--text-2); }
tbody tr:last-child td { border-bottom: none; }
tbody td:first-child { font-weight: 600; white-space: nowrap; }
tbody tr:hover td { background: #FFFBEA; }

/* ---------- 玩转核心功能（4 步） ---------- */
.feature-step {
  display: flex;
  align-items: center;
  gap: 60px;
  margin-bottom: 96px;
}
.feature-step:last-child { margin-bottom: 0; }
.feature-step.reverse { flex-direction: row-reverse; }
.step-media { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 20px; }
.step-media img.step-bubble { width: 100%; max-width: 460px; }
.step-media img.step-phone { width: 100%; max-width: 520px; border-radius: 24px; box-shadow: var(--shadow); }
.step-text { flex: 1; }
.step-no {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--black);
  background: var(--yellow);
  padding: 6px 18px;
  border-radius: var(--radius-pill);
  margin-bottom: 18px;
}
.step-text h3 { font-size: 32px; font-weight: 800; margin-bottom: 14px; }
.step-text p { font-size: 17px; color: var(--text-2); line-height: 1.9; }

/* ---------- 灵感接力 ---------- */
.inspire-inner { display: flex; align-items: center; gap: 60px; }
.inspire-media { flex: 1; display: flex; justify-content: center; position: relative; }
.inspire-media img { border-radius: 24px; box-shadow: var(--shadow); width: 100%; max-width: 520px; }
.inspire-text { flex: 1; }
.inspire-text h2 { font-size: 34px; font-weight: 800; margin-bottom: 22px; }
.inspire-text p { font-size: 17px; color: var(--text-2); line-height: 2; margin-bottom: 14px; }
.inspire-feats { margin: 22px 0; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.inspire-feat {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-size: 14px;
  color: var(--text-2);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ---------- 发现精彩作品 ---------- */
.works-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.work-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform .2s ease;
}
.work-card:hover { transform: translateY(-5px); }
.work-card .work-img { width: 100%; aspect-ratio: 781 / 1614; object-fit: cover; background: var(--bg-gray); }
.work-card .work-info { padding: 18px 20px; }
.work-card .work-name { font-size: 18px; font-weight: 700; margin-bottom: 6px; }
.work-card .work-desc { font-size: 14px; color: var(--text-3); margin-bottom: 12px; }
.work-stats { display: flex; gap: 16px; font-size: 13px; color: var(--text-3); }
.work-stats span b { color: var(--black); font-weight: 600; }

/* ---------- 常见问题 ---------- */
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  background: var(--white);
  overflow: hidden;
}
.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
}
.faq-q .faq-arrow { transition: transform .25s ease; color: var(--text-3); font-size: 20px; }
.faq-item.open .faq-arrow { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-a-inner { padding: 0 24px 22px; color: var(--text-2); font-size: 15px; line-height: 1.9; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: #000;
  color: #fff;
  padding: 44px 0 36px;
  margin-top: 40px;
}
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 700; }
.footer-brand img { width: 34px; height: 34px; border-radius: 8px; }
.footer-links { display: flex; gap: 24px; font-size: 14px; color: rgba(255,255,255,.7); }
.footer-links a:hover { color: #fff; }
.footer-copy { width: 100%; text-align: center; margin-top: 24px; font-size: 13px; color: rgba(255,255,255,.5); border-top: 1px solid rgba(255,255,255,.12); padding-top: 20px; }

/* ============================================================
   文档中心（docs.html）
   ============================================================ */
.docs-header {
  background: var(--black);
  color: #fff;
}
.docs-header .header-inner { height: 64px; }
.docs-header .brand, .docs-header .main-nav a { color: #fff; }
.docs-header .main-nav a:hover { color: var(--yellow); }
.docs-header .main-nav a.active { color: var(--yellow); font-weight: 700; }

.docs-layout {
  display: flex;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  gap: 40px;
  align-items: flex-start;
}
.docs-sidebar {
  position: sticky;
  top: 88px;
  width: 240px;
  flex-shrink: 0;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  padding: 24px 12px 24px 0;
  border-right: 1px solid var(--border);
}
.docs-sidebar::-webkit-scrollbar { width: 4px; }
.docs-sidebar::-webkit-scrollbar-thumb { background: #ddd; border-radius: 4px; }
.docs-group { margin-bottom: 22px; }
.docs-group-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-3);
  padding: 6px 14px;
  text-transform: uppercase;
  letter-spacing: .5px;
}
.docs-group ul li a {
  display: block;
  padding: 9px 14px;
  font-size: 15px;
  color: var(--text-2);
  border-radius: 10px;
  margin-bottom: 2px;
  border-left: 3px solid transparent;
}
.docs-group ul li a:hover { background: var(--bg-light); color: var(--black); }
.docs-group ul li a.active {
  background: #FFFBEA;
  color: var(--black);
  font-weight: 700;
  border-left-color: var(--yellow);
}

.docs-content {
  flex: 1;
  min-width: 0;
  padding: 36px 8px 80px;
}
.doc-article {
  display: none;
  animation: fadeIn .3s ease;
}
.doc-article.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.doc-article h1 { font-size: 32px; font-weight: 800; margin-bottom: 8px; }
.doc-meta { color: var(--text-3); font-size: 13px; margin-bottom: 28px; padding-bottom: 20px; border-bottom: 1px solid var(--border); }
.doc-article h2 { font-size: 24px; font-weight: 700; margin: 36px 0 16px; padding-left: 12px; border-left: 4px solid var(--yellow); }
.doc-article h3 { font-size: 19px; font-weight: 700; margin: 26px 0 12px; }
.doc-article p { font-size: 16px; color: var(--text-2); line-height: 1.95; margin-bottom: 14px; }
.doc-article ul, .doc-article ol { margin: 0 0 16px 6px; }
.doc-article ul li, .doc-article ol li {
  font-size: 15.5px;
  color: var(--text-2);
  line-height: 1.9;
  padding-left: 22px;
  position: relative;
  margin-bottom: 8px;
}
.doc-article ul li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--yellow);
}
.doc-article ol { counter-reset: docol; }
.doc-article ol li { counter-increment: docol; }
.doc-article ol li::before {
  content: counter(docol);
  position: absolute;
  left: 0;
  top: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--yellow);
  color: #000;
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.doc-article .note {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-left: 4px solid var(--yellow);
  border-radius: 12px;
  padding: 14px 18px;
  font-size: 14.5px;
  color: var(--text-2);
  margin: 18px 0;
}
.doc-article table th { white-space: nowrap; }
.doc-article table td:first-child { white-space: nowrap; font-weight: 600; }

.doc-article blockquote {
  border-left: 4px solid var(--yellow);
  background: var(--bg-light);
  padding: 14px 18px;
  border-radius: 0 12px 12px 0;
  margin: 16px 0;
  color: var(--text-2);
  font-size: 15.5px;
}
.doc-article code {
  background: var(--bg-gray);
  border-radius: 6px;
  padding: 2px 8px;
  font-size: 14px;
  font-family: Consolas, Menlo, monospace;
}
.doc-article .tip-card {
  background: #FFFBEA;
  border-radius: 14px;
  padding: 18px 20px;
  margin: 16px 0;
}
.doc-article .tip-card b { display: block; margin-bottom: 6px; }

/* ---------- 文章底部：上一页 / 下一页 ---------- */
.doc-pager {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}
.doc-pager a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 46%;
  padding: 12px 18px;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  background: var(--white);
  color: var(--text-1);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: all .2s ease;
}
.doc-pager a .pager-label { display: block; font-size: 12px; color: var(--text-3); font-weight: 400; margin-bottom: 2px; }
.doc-pager a .pager-title { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.doc-pager a:hover { border-color: var(--yellow); background: #FFFBEA; color: #000; }
.doc-pager a:hover .pager-label { color: var(--text-2); }
.doc-pager a.pager-prev { justify-content: flex-start; text-align: left; }
.doc-pager a.pager-next { justify-content: flex-end; text-align: right; margin-left: auto; }
.doc-pager a.is-hidden { visibility: hidden; pointer-events: none; }

/* ============================================================
   吐司教程站 — 教程站专属样式
   ============================================================ */

/* ---------- 学习路径（首页三大课程） ---------- */
.course-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.course-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  transition: transform .2s ease, box-shadow .2s ease;
}
.course-card:hover { transform: translateY(-5px); box-shadow: 0 14px 38px rgba(0,0,0,.1); }
.course-card .course-icon {
  width: 58px; height: 58px;
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 28px;
  margin-bottom: 18px;
}
.course-card h3 { font-size: 21px; font-weight: 800; margin-bottom: 8px; }
.course-card .course-tagline { font-size: 14px; color: var(--text-3); margin-bottom: 18px; }
.course-card .course-list { margin: 0 0 22px; flex: 1; }
.course-card .course-list li {
  display: flex; align-items: baseline; gap: 8px;
  font-size: 14.5px; color: var(--text-2);
  padding: 7px 0; border-bottom: 1px dashed var(--border);
}
.course-card .course-list li:last-child { border-bottom: none; }
.course-card .course-list li b { color: var(--black); }
.course-cta {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  background: var(--black); color: #fff;
  border-radius: var(--radius-pill); padding: 11px 22px;
  font-size: 14.5px; font-weight: 600;
  transition: opacity .15s;
}
.course-cta:hover { opacity: .85; }
.course-cta.yellow { background: var(--yellow); color: var(--black); }

/* ---------- 教程中心：课程分组与课程元信息 ---------- */
.course-title {
  display: flex; align-items: center; gap: 10px;
  font-size: 20px; font-weight: 800;
  margin: 40px 0 6px; padding-bottom: 10px;
  border-bottom: 2px solid var(--yellow);
}
.course-title:first-of-type { margin-top: 0; }
.course-sub { font-size: 13px; color: var(--text-3); margin-bottom: 8px; }

.lesson-meta { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0 20px; }
.lesson-meta .lm {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 5px 14px;
  font-size: 13px;
  color: var(--text-2);
}
.lesson-meta .lm b { color: var(--black); }
.lesson-meta .lm.yellow { background: #FFFBEA; border-color: var(--yellow); }

.lesson-goal {
  background: #FFFBEA;
  border: 1px solid #FFE8A3;
  border-radius: 14px;
  padding: 16px 20px;
  margin: 18px 0 24px;
}
.lesson-goal b { display: block; margin-bottom: 6px; font-size: 15px; }
.lesson-goal ul { margin: 0; padding-left: 4px; }
.lesson-goal ul li { font-size: 14.5px; }

/* ---------- 步骤条（教程步骤） ---------- */
.tut-steps { counter-reset: tstep; margin: 20px 0; }
.tut-step {
  position: relative;
  padding: 0 0 22px 52px;
  margin-bottom: 6px;
}
.tut-step::before {
  counter-increment: tstep;
  content: counter(tstep);
  position: absolute; left: 0; top: 0;
  width: 36px; height: 36px;
  border-radius: 12px;
  background: var(--yellow);
  color: var(--black);
  font-size: 16px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
}
.tut-step::after {
  content: "";
  position: absolute; left: 17px; top: 40px; bottom: 4px;
  width: 2px; background: var(--border);
}
.tut-step:last-child::after { display: none; }
.tut-step h4 { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.tut-step p, .tut-step ul, .tut-step ol { font-size: 15px; color: var(--text-2); line-height: 1.9; }
.tut-step ul li, .tut-step ol li { font-size: 15px; }

/* ---------- 首页教程亮点 ---------- */
.highlight-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.highlight-card {
  text-align: center;
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
}
.highlight-card .hi-icon { font-size: 34px; margin-bottom: 12px; }
.highlight-card h4 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.highlight-card p { font-size: 13.5px; color: var(--text-3); line-height: 1.7; }

/* ---------- 首页：教程中心入口横幅 ---------- */
.tut-cta {
  background: var(--yellow);
  border-radius: var(--radius-lg);
  padding: 48px 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.tut-cta .tut-cta-title { font-size: 30px; font-weight: 800; margin-bottom: 10px; }
.tut-cta .tut-cta-sub { font-size: 16px; color: #000; opacity: .75; line-height: 1.8; }
.tut-cta .btn { background: #000; color: #fff; }
.tut-cta-stats { display: flex; gap: 34px; margin-top: 20px; flex-wrap: wrap; }
.tut-cta-stats .ts b { display: block; font-size: 26px; font-weight: 800; }
.tut-cta-stats .ts span { font-size: 13px; opacity: .7; }

/* ---------- 教程中心：全网精选来源标注 ---------- */
.doc-source {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px;
  margin: 26px 0 0;
  font-size: 13px;
  color: var(--text-3);
  line-height: 1.8;
}
.doc-source a { color: var(--black); font-weight: 600; border-bottom: 1px solid var(--yellow); }
.doc-source a:hover { background: var(--yellow); }

.tag-new {
  display: inline-block;
  vertical-align: middle;
  margin-left: 8px;
  background: #000;
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 9px;
  border-radius: var(--radius-pill);
  letter-spacing: .5px;
}
.doc-article h1 .tag-new { vertical-align: middle; }

.lesson-goal.yellow-border { border-color: #FFE8A3; }

/* ---------- 下载二维码弹窗 ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, .55);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.modal-overlay.open { display: flex; }
.qr-modal {
  background: #fff;
  border-radius: 20px;
  padding: 26px 34px 28px;
  max-width: 360px;
  width: 100%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .28);
  animation: fadeIn .25s ease;
  position: relative;
}
.qr-modal .qr-close {
  position: absolute;
  top: 14px;
  right: 16px;
  border: none;
  background: transparent;
  font-size: 24px;
  line-height: 1;
  color: var(--text-3);
  cursor: pointer;
}
.qr-modal .qr-close:hover { color: var(--black); }
.qr-modal img.qr-img {
  width: 200px;
  height: 200px;
  margin: 6px auto 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
}
.qr-modal h4 { font-size: 20px; font-weight: 800; margin-bottom: 6px; }
.qr-modal .qr-sub { font-size: 14px; color: var(--text-3); margin-bottom: 14px; }
.qr-modal .qr-hint {
  font-size: 13px;
  color: var(--text-2);
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  line-height: 1.7;
}

/* ---------- GEO 摘要块（利于 AI 引擎提取） ---------- */
.geo-summary {
  max-width: 980px;
  margin: 0 auto 8px;
  background: #FFFBEA;
  border: 1px solid #FFE8A3;
  border-radius: 16px;
  padding: 18px 24px;
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.9;
}
.geo-summary b { color: var(--black); }
.geo-summary .geo-kw { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 8px; }
.geo-summary .geo-kw span {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 12px;
  font-size: 12.5px;
  color: var(--text-3);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .course-grid { grid-template-columns: 1fr 1fr; }
  .highlight-grid { grid-template-columns: 1fr 1fr; }
  .tut-cta { flex-direction: column; text-align: center; }
}
@media (max-width: 640px) {
  .course-grid, .highlight-grid { grid-template-columns: 1fr; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .adv-cards { grid-template-columns: 1fr 1fr; }
  .works-grid { grid-template-columns: 1fr 1fr; }
  .feature-step, .feature-step.reverse, .inspire-inner { flex-direction: column; gap: 32px; }
  .hero-inner { flex-direction: column; text-align: center; }
  .download-group { justify-content: center; }
  .docs-layout { flex-direction: column; }
  .docs-sidebar { position: static; width: 100%; border-right: none; border-bottom: 1px solid var(--border); max-height: none; padding: 12px 0; }
  .main-nav { display: none; }
}
@media (max-width: 640px) {
  .adv-cards, .works-grid { grid-template-columns: 1fr; }
  .hero-text h1 { font-size: 52px; }
  .hero-slogan { font-size: 32px; }
  .section-head h2 { font-size: 28px; }
  .step-text h3 { font-size: 26px; }
  .container { padding: 0 20px; }
}