/* ================================================================
   双层 PDF 工具 门户站 – 深蓝色调 (与桌面端统一)
   ================================================================ */

:root {
  /* ---- 品牌色 ---- */
  --brand-1: #304FFE;
  --brand-2: #2558FF;
  --brand-3: #5C7CFF;
  --brand-light: #EDF3FF;
  --brand-lighter: #F4F7FF;
  --brand-dark: #1A3ACC;
  --brand-deep: #0E1F48;

  /* ---- 文字 ---- */
  --heading: #14213D;
  --text: #2A3550;
  --text-secondary: #5F6B85;
  --text-muted: #8B97B2;

  /* ---- 背景 / 面板 ---- */
  --bg: #F5F8FF;
  --surface: #FFFFFF;
  --panel: rgba(255,255,255,0.92);
  --border: #E0E8F6;
  --border-light: #EDF2FA;

  /* ---- 功能色 ---- */
  --success: #2E7D32;
  --warning: #E6A700;
  --error: #C62828;

  /* ---- 阴影 / 圆角 ---- */
  --shadow-sm: 0 2px 8px rgba(14,31,72,0.06);
  --shadow: 0 8px 28px rgba(14,31,72,0.08);
  --shadow-lg: 0 16px 48px rgba(14,31,72,0.12);
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* ---- 布局 ---- */
  --container: 1180px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--brand-1); text-decoration: none; }
a:hover { color: var(--brand-dark); }

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

/* ================================================================
   HEADER
   ================================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--brand-1);
  box-shadow: 0 2px 16px rgba(14,31,72,0.18);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
}
.logo-mark {
  width: 32px;
  height: 32px;
  background: #fff;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.logo-mark::before {
  content: "";
  width: 16px;
  height: 10px;
  background: var(--brand-1);
  clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
  position: absolute;
  top: 8px;
}
.logo-mark::after {
  content: "";
  width: 16px;
  height: 10px;
  background: var(--brand-3);
  clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
  position: absolute;
  top: 13px;
  opacity: 0.7;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav a {
  color: rgba(255,255,255,0.85);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.nav a:hover,
.nav a.active {
  color: #fff;
  border-bottom-color: rgba(255,255,255,0.6);
}
.btn-header {
  padding: 7px 18px;
  background: #fff;
  color: var(--brand-1);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 13px;
  text-decoration: none;
  transition: background 0.2s;
}
.btn-header:hover { background: #E8EEFF; color: var(--brand-1); }

/* ================================================================
   HERO
   ================================================================ */
.hero {
  background: linear-gradient(135deg, var(--brand-deep) 0%, var(--brand-1) 60%, var(--brand-3) 100%);
  color: #fff;
  padding: 80px 0 96px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  width: 600px; height: 600px;
  top: -200px; right: -100px;
  background: radial-gradient(circle, rgba(92,124,255,0.25), transparent 70%);
  pointer-events: none;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero-label {
  margin: 0 0 16px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  color: rgba(255,255,255,0.7);
  text-transform: uppercase;
}
.hero-title {
  margin: 0 0 20px;
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.5px;
}
.hero-desc {
  margin: 0 0 32px;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(255,255,255,0.88);
  max-width: 500px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 40px;
}
.hero-stat { text-align: left; }
.hero-stat-num {
  display: block;
  font-size: 28px;
  font-weight: 800;
  color: #fff;
}
.hero-stat-label {
  font-size: 12px;
  color: rgba(255,255,255,0.6);
}

.hero-visual { display: flex; justify-content: center; }
.hero-mockup {
  width: 100%;
  max-width: 440px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(12px);
}
.mockup-bar {
  height: 32px;
  background: rgba(255,255,255,0.12);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 6px;
}
.mockup-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.3);
}
.mockup-content {
  padding: 48px 24px;
  text-align: center;
  color: rgba(255,255,255,0.5);
  font-size: 14px;
}

/* ================================================================
   APP DEMO ANIMATION (hero mockup)
   ================================================================ */
.demo-window { width:100%;max-width:540px;background:rgba(255,255,255,0.08);border:1px solid rgba(255,255,255,0.15);border-radius:12px;overflow:hidden;backdrop-filter:blur(12px);position:relative;aspect-ratio:480/340; }
.demo-titlebar { height:32px;background:rgba(255,255,255,0.1);display:flex;align-items:center;padding:0 12px;gap:6px; }
.demo-dot { width:8px;height:8px;border-radius:50%; }
.demo-r { background:#ff5f57; }
.demo-y { background:#febc2e; }
.demo-g { background:#28c840; }
.demo-titletext { margin-left:8px;font-size:11px;color:rgba(255,255,255,0.6); }
.demo-frame { position:absolute;top:32px;left:0;right:0;bottom:0;padding:16px;opacity:0; }
.demo-stepdot { width:20px;height:20px;border-radius:50%;background:#304FFE;display:inline-flex;align-items:center;justify-content:center;color:#fff;font-size:10px;font-weight:700;margin-right:8px;box-shadow:0 0 0 3px rgba(48,79,254,0.25); }
.demo-steplabel { font-size:13px;font-weight:700;color:#fff; }
.demo-dropzone { margin-top:12px;border:2px dashed rgba(255,255,255,0.3);border-radius:12px;padding:28px 0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px; }
.demo-pdficon { width:40px;height:40px;background:rgba(255,255,255,0.15);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:800;color:#fff; }
.demo-droptext { font-size:13px;color:rgba(255,255,255,0.8);font-weight:600; }
.demo-drophint { font-size:10px;color:rgba(255,255,255,0.4); }
.demo-selbtn { margin-top:12px;width:100%;height:36px;background:#304FFE;border-radius:8px;color:#fff;font-size:13px;font-weight:600;display:flex;align-items:center;justify-content:center; }
.demo-filebar { background:rgba(255,255,255,0.12);border:1px solid rgba(255,255,255,0.15);border-radius:10px;padding:10px 12px;display:flex;align-items:center;gap:8px; }
.demo-fileicon { width:28px;height:28px;background:#304FFE;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:8px;font-weight:800;color:#fff;flex-shrink:0; }
.demo-filename { font-size:11px;color:#fff;font-weight:600; }
.demo-filepages { font-size:9px;color:rgba(255,255,255,0.5); }
.demo-gencard { margin-top:12px;background:rgba(255,255,255,0.12);border:1px solid rgba(255,255,255,0.2);border-radius:10px;padding:14px; }
.demo-pathrow { font-size:10px;color:rgba(255,255,255,0.5);margin-bottom:10px; }
.demo-genbtn { width:100%;height:38px;background:#304FFE;border-radius:8px;color:#fff;font-size:14px;font-weight:700;display:flex;align-items:center;justify-content:center; }
.demo-progresscard { margin-top:12px;background:rgba(255,255,255,0.12);border:1px solid rgba(255,255,255,0.2);border-radius:10px;padding:14px; }
.demo-progtitle { font-size:13px;font-weight:700;color:#fff;margin-bottom:10px; }
.demo-progtrack { height:6px;background:rgba(255,255,255,0.15);border-radius:3px;overflow:hidden; }
.demo-progfill { height:100%;background:#5C7CFF;border-radius:3px;width:0%; }
.demo-progtext { font-size:10px;color:rgba(255,255,255,0.5);margin-top:6px; }
.demo-donecard { margin-top:12px;background:rgba(46,125,50,0.15);border:1px solid rgba(46,125,50,0.3);border-radius:10px;padding:14px; }
.demo-donetitle { font-size:13px;font-weight:700;color:#66BB6A;margin-bottom:8px; }
.demo-donetext { font-size:10px;color:rgba(255,255,255,0.6);margin-bottom:12px; }
.demo-btnrow { display:flex;gap:8px; }
.demo-btnprev { flex:1;height:34px;background:#304FFE;border-radius:8px;color:#fff;font-size:12px;font-weight:600;display:flex;align-items:center;justify-content:center; }
.demo-btnexp { flex:1;height:34px;background:rgba(255,255,255,0.12);border:1px solid rgba(255,255,255,0.2);border-radius:8px;color:#fff;font-size:12px;font-weight:600;display:flex;align-items:center;justify-content:center; }
.demo-cursor { position:absolute;width:16px;height:20px;z-index:10;opacity:0; }
.demo-cursor svg { width:100%;height:100%; }
.demo-dragfile { position:absolute;width:48px;height:56px;background:rgba(48,79,254,0.3);border:1px solid rgba(48,79,254,0.5);border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:9px;font-weight:800;color:#fff;z-index:9;opacity:0; }
.demo-click { position:absolute;width:24px;height:24px;border-radius:50%;border:2px solid rgba(255,255,255,0.6);z-index:10;opacity:0; }

/* Animations - 12s loop */
.demo-f1 { animation: demoF1 12s infinite; }
.demo-f2 { animation: demoF2 12s infinite; }
.demo-f3 { animation: demoF3 12s infinite; }
.demo-f4 { animation: demoF4 12s infinite; }
@keyframes demoF1 { 0%,25%{opacity:1} 29%,100%{opacity:0} }
@keyframes demoF2 { 0%,25%{opacity:0} 29%,46%{opacity:1} 50%,100%{opacity:0} }
@keyframes demoF3 { 0%,46%{opacity:0} 50%,75%{opacity:1} 79%,100%{opacity:0} }
@keyframes demoF4 { 0%,75%{opacity:0} 79%,100%{opacity:1} }
.demo-progfill { animation: demoFill 12s infinite; }
@keyframes demoFill { 0%,50%{width:0} 55%{width:15%} 60%{width:35%} 65%{width:55%} 70%{width:78%} 75%,100%{width:100%} }
.demo-cursor { animation: demoCursor 12s infinite; }
@keyframes demoCursor { 0%{opacity:0;left:80%;top:60px} 5%{opacity:1;left:80%;top:60px} 8%{opacity:1;left:62%;top:100px} 15%{opacity:1;left:50%;top:55%} 20%,100%{opacity:0;left:50%;top:55%} }
.demo-dragfile { animation: demoDrag 12s infinite; }
@keyframes demoDrag { 0%{opacity:0;left:78%;top:50px} 5%{opacity:.8;left:78%;top:50px} 8%{opacity:.8;left:60%;top:90px} 15%{opacity:.8;left:48%;top:52%} 18%,100%{opacity:0} }
.demo-click { animation: demoClick 12s infinite; }
@keyframes demoClick { 0%,42%{opacity:0;transform:scale(.5);left:50%;top:68%} 44%{opacity:1;transform:scale(.5)} 47%,100%{opacity:0;transform:scale(2)} }

/* ================================================================
   BUTTONS
   ================================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  gap: 6px;
}
.btn-lg { padding: 13px 30px; font-size: 15px; }
.btn-sm { padding: 7px 16px; font-size: 13px; }

.btn-primary {
  background: #fff;
  color: var(--brand-1);
}
.btn-primary:hover { background: #E8EEFF; color: var(--brand-1); }

.btn-blue {
  background: var(--brand-1);
  color: #fff;
}
.btn-blue:hover { background: var(--brand-dark); color: #fff; }

.btn-outline {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.5);
}
.btn-outline:hover { background: rgba(255,255,255,0.12); border-color: rgba(255,255,255,0.8); color: #fff; }

.btn-ghost {
  background: var(--brand-lighter);
  color: var(--brand-1);
}
.btn-ghost:hover { background: #DCE5FF; color: var(--brand-1); }

/* ================================================================
   SECTIONS
   ================================================================ */
.section {
  padding: 72px 0;
}
.section-alt {
  background: var(--surface);
}
.section-head {
  text-align: center;
  margin-bottom: 48px;
}
.section-badge {
  display: inline-block;
  padding: 4px 14px;
  background: var(--brand-lighter);
  color: var(--brand-1);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
}
.section-title {
  margin: 0 0 12px;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  color: var(--heading);
  line-height: 1.2;
}
.section-subtitle {
  margin: 0;
  font-size: 15px;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto;
}

/* ================================================================
   FEATURE CARDS (4-col)
   ================================================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.feature-card {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s, box-shadow 0.25s;
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}
.feature-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius);
  background: var(--brand-lighter);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 16px;
  color: var(--brand-1);
}
.feature-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--heading);
}
.feature-card p {
  margin: 0;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ================================================================
   SCENE CARDS (3-col)
   ================================================================ */
.scene-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.scene-card {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s, box-shadow 0.25s;
}
.scene-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.scene-card .scene-tag {
  display: inline-block;
  padding: 3px 10px;
  background: var(--brand-lighter);
  color: var(--brand-1);
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 12px;
}
.scene-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--heading);
}
.scene-card p {
  margin: 0;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ================================================================
   STEPS (4-col)
   ================================================================ */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.step-card {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--brand-1);
  color: #fff;
  border-radius: 50%;
  font-weight: 800;
  font-size: 16px;
  margin-bottom: 14px;
}
.step-card h3 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--heading);
}
.step-card p {
  margin: 0;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ================================================================
   TUTORIAL HUB CARDS
   ================================================================ */
.tutorial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.tutorial-card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: inherit;
  transition: transform 0.25s, box-shadow 0.25s;
}
.tutorial-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  color: inherit;
}
.tutorial-card .tc-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 12px;
  width: fit-content;
}
.tc-tag.beginner { background: #E8F5E9; color: #2E7D32; }
.tc-tag.guide    { background: var(--brand-lighter); color: var(--brand-1); }
.tc-tag.advanced { background: #FFF3E0; color: #E65100; }
.tc-tag.seo      { background: #F3E8FF; color: #7B1FA2; }
.tutorial-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--heading);
}
.tutorial-card p {
  margin: 0;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}
.tutorial-card .tc-meta {
  margin-top: 14px;
  font-size: 12px;
  color: var(--text-muted);
}

/* ================================================================
   ARTICLE PAGE
   ================================================================ */
.article-layout {
  display: grid;
  grid-template-columns: 0.72fr 0.28fr;
  gap: 32px;
  align-items: start;
}
.article-main {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
}
.article-main h1 {
  font-size: 28px;
  font-weight: 800;
  color: var(--heading);
  margin: 0 0 8px;
  line-height: 1.3;
}
.article-meta {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
}
.article-main h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--heading);
  margin: 32px 0 12px;
}
.article-main h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--heading);
  margin: 24px 0 10px;
}
.article-main p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}
.article-main ul, .article-main ol {
  margin: 0 0 16px;
  padding-left: 24px;
}
.article-main li {
  margin-bottom: 8px;
  font-size: 15px;
  line-height: 1.7;
}
.article-main blockquote {
  margin: 20px 0;
  padding: 16px 20px;
  background: var(--brand-lighter);
  border-left: 4px solid var(--brand-1);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-secondary);
  font-size: 14px;
}
.article-main code {
  background: var(--brand-lighter);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
  color: var(--brand-dark);
}
.article-main table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}
.article-main th,
.article-main td {
  padding: 10px 14px;
  border: 1px solid var(--border);
  text-align: left;
  line-height: 1.6;
}
.article-main th {
  background: var(--brand-lighter);
  color: var(--heading);
  font-weight: 700;
  font-size: 13px;
}
.article-main td {
  color: var(--text);
}
.article-main tr:nth-child(even) td {
  background: var(--bg);
}

/* Sidebar */
.article-sidebar {
  position: sticky;
  top: 80px;
}
.sidebar-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
}
.sidebar-card h4 {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 700;
  color: var(--heading);
}
.sidebar-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.sidebar-card li {
  margin-bottom: 8px;
}
.sidebar-card li a {
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
}
.sidebar-card li a:hover {
  color: var(--brand-1);
}
.sidebar-cta {
  background: linear-gradient(135deg, var(--brand-deep), var(--brand-1));
  border: none;
  color: #fff;
}
.sidebar-cta h4 { color: #fff; }
.sidebar-cta p {
  margin: 0 0 14px;
  font-size: 13px;
  color: rgba(255,255,255,0.75);
  line-height: 1.6;
}

/* ================================================================
   DOWNLOAD
   ================================================================ */
.download-card {
  max-width: 640px;
  margin: 0 auto 16px;
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
}
.download-info {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 1;
  min-width: 200px;
}
.download-icon-box {
  width: 48px; height: 48px;
  background: var(--brand-lighter);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}
.download-info h3 {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
  color: var(--heading);
}
.download-info p {
  margin: 0;
  font-size: 12px;
  color: var(--text-muted);
}
.download-meta {
  display: flex;
  gap: 20px;
  font-size: 12px;
  color: var(--text-muted);
}
.download-tip {
  margin: 0;
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
}

/* ================================================================
   CONTACT
   ================================================================ */
.contact-grid {
  max-width: 600px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.contact-card {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.contact-label {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
}
.contact-value {
  font-size: 17px;
  font-weight: 700;
  color: var(--brand-1);
  text-decoration: none;
}
.contact-value:hover { text-decoration: underline; }

/* ================================================================
   CTA BANNER
   ================================================================ */
.cta-section {
  background: linear-gradient(135deg, var(--brand-deep), var(--brand-1));
  padding: 56px 0;
  text-align: center;
  color: #fff;
}
.cta-section h2 {
  margin: 0 0 12px;
  font-size: 28px;
  font-weight: 800;
}
.cta-section p {
  margin: 0 0 24px;
  font-size: 15px;
  color: rgba(255,255,255,0.75);
}

/* ================================================================
   FOOTER
   ================================================================ */
.site-footer {
  background: var(--brand-deep);
  color: rgba(255,255,255,0.65);
  padding: 48px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 32px;
}
.footer-brand p {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255,255,255,0.5);
}
.footer-col h4 {
  margin: 0 0 14px;
  font-size: 14px;
  font-weight: 700;
  color: rgba(255,255,255,0.9);
}
.footer-col a {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  color: rgba(255,255,255,0.55);
  text-decoration: none;
}
.footer-col a:hover { color: rgba(255,255,255,0.9); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: rgba(255,255,255,0.35);
}

/* ================================================================
   BREADCRUMB
   ================================================================ */
.breadcrumb {
  padding: 16px 0;
  font-size: 13px;
  color: var(--text-muted);
}
.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
}
.breadcrumb a:hover { color: var(--brand-1); }
.breadcrumb span { margin: 0 6px; }

/* ================================================================
   FAQ
   ================================================================ */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
}
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-q {
  padding: 18px 24px;
  font-weight: 700;
  font-size: 15px;
  color: var(--heading);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-q::after {
  content: "+";
  font-size: 20px;
  color: var(--text-muted);
  transition: transform 0.2s;
}
.faq-item.open .faq-q::after {
  transform: rotate(45deg);
}
.faq-a {
  padding: 0 24px 18px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  display: none;
}
.faq-item.open .faq-a {
  display: block;
}

/* ================================================================
   CONTACT PAGE CARDS
   ================================================================ */
.contact-page-card {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.contact-page-icon {
  font-size: 32px;
  margin-bottom: 14px;
}
.contact-page-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--heading);
}
.contact-page-value {
  display: block;
  font-size: 22px;
  font-weight: 800;
  color: var(--brand-1);
  text-decoration: none;
  margin-bottom: 10px;
}
.contact-page-value:hover { text-decoration: underline; }
.contact-page-card p {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ================================================================
   STICKY DOWNLOAD BAR (底部浮动下载条)
   ================================================================ */
.sticky-download {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 300;
  background: var(--brand-deep);
  border-top: 1px solid rgba(92,124,255,0.3);
  padding: 12px 0;
  box-shadow: 0 -4px 20px rgba(14,31,72,0.2);
  transform: translateY(100%);
  transition: transform 0.35s ease;
}
.sticky-download.visible {
  transform: translateY(0);
}
.sticky-download .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.sticky-download-text {
  color: rgba(255,255,255,0.85);
  font-size: 14px;
  font-weight: 500;
}
.sticky-download-text strong {
  color: #fff;
}
.sticky-download .btn {
  flex-shrink: 0;
}

/* ================================================================
   INLINE CTA BANNER (文章内嵌引导条)
   ================================================================ */
.inline-cta {
  margin: 28px 0;
  padding: 22px 24px;
  background: linear-gradient(135deg, var(--brand-lighter), #DCE5FF);
  border: 1px solid #C8D6F0;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.inline-cta-text {
  flex: 1;
  min-width: 200px;
}
.inline-cta-text h4 {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 700;
  color: var(--heading);
}
.inline-cta-text p {
  margin: 0;
  font-size: 13px;
  color: var(--text-secondary);
}

/* ================================================================
   PRODUCT HIGHLIGHT STRIP
   ================================================================ */
.product-strip {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin: 24px 0;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.product-strip-icon {
  width: 44px;
  height: 44px;
  background: var(--brand-lighter);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.product-strip-body {
  flex: 1;
  min-width: 200px;
}
.product-strip-body h4 {
  margin: 0 0 2px;
  font-size: 14px;
  font-weight: 700;
  color: var(--heading);
}
.product-strip-body p {
  margin: 0;
  font-size: 12px;
  color: var(--text-muted);
}

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-desc { max-width: none; margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-visual { display: none; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .scene-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .tutorial-grid { grid-template-columns: repeat(2, 1fr); }
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { position: static; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .nav { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .tutorial-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; }
}