:root {
  /* Brand — 品牌蓝 */
  --brand-deep: #1e3a5f;
  --brand-dark: #1E55C8;
  --brand: #2563eb;
  --brand-light: #3b82f6;
  --brand-bg: #eff6ff;

  /* Accent — 琥珀强调 */
  --amber: #f59e0b;
  --amber-dark: #d97706;
  --amber-light: #fffbeb;

  /* Neutral — 中性灰 */
  --heading: #0f172a;
  --text: #334155;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --border-light: #f1f5f9;

  /* Functional */
  --success: #16a34a;
  --warning: #d97706;
  --error: #dc2626;

  /* Shadows — 扁平化 */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.10);

  /* Radius — 克制 */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Layout */
  --container: 1180px;
  --font-sans: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}
img { max-width: 100%; display: block; }
a { color: var(--brand); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--amber); }

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
/* 汉堡按钮桌面隐藏（移动端 @media 内 display:flex 覆盖显示） */
.menu-toggle { display: none; }
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--heading);
  text-decoration: none;
}
.logo:hover { color: var(--heading); }
.logo-mark {
  width: 32px;
  height: 32px;
  background: url('/assets/common/logo.png') center/contain no-repeat;
  border-radius: 6px;
  flex-shrink: 0;
}

.nav {
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav a {
  color: var(--text-secondary);
  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: var(--amber);
  border-bottom-color: var(--amber);
}
.btn-header {
  padding: 7px 18px;
  background: var(--amber);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 13px;
  text-decoration: none;
  transition: background 0.2s;
}
.btn-header:hover {
  background: var(--amber-dark);
  color: #fff;
  transform: none;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
}
.breadcrumb a:hover {
  color: var(--brand);
}
.breadcrumb .sep {
  color: var(--border);
}
.breadcrumb .current {
  color: var(--text);
  font-weight: 500;
}

.hero {
  background: linear-gradient(135deg, #0f1d36 0%, #1a3668 50%, #1e3a5f 100%);
  color: #fff;
  padding: 100px 0 120px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  width: 520px; height: 520px;
  top: -160px; right: -120px;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 50%;
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  width: 320px; height: 320px;
  bottom: -80px; left: -60px;
  border: 1px solid rgba(255,255,255,0.04);
  border-radius: 50%;
  pointer-events: none;
}
.hero-product {
  background: linear-gradient(135deg, #183967 0%, #2563eb 60%, #1E55C8 100%);
  color: #fff;
  border-bottom: none;
  padding: 100px 0 120px;
  position: relative;
  overflow: hidden;
}
.hero-product::before {
  content: "";
  position: absolute;
  width: 400px; height: 400px;
  top: -100px; right: -80px;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 50%;
  pointer-events: none;
}
.hero-product .hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero-product .hero-content {
  max-width: 560px;
}
.hero-product .hero-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.5px;
  color: var(--amber);
  text-transform: uppercase;
  margin: 0 0 12px;
}
.hero-product .hero-title {
  color: #fff;
  font-size: clamp(28px, 3.5vw, 42px);
}
.hero-product .hero-desc {
  color: rgba(255,255,255,0.6);
}
.hero-product .hero-stat-num {
  color: #fff;
}
.hero-product .hero-stat-label {
  color: rgba(255,255,255,0.64);
}
.hero-product .hero-stats {
  gap: 18px;
  margin-top: 36px;
}
.hero-product .hero-stat {
  min-width: 118px;
  padding-top: 14px;
  border-top: 1px solid rgba(255,255,255,0.18);
}
.hero-product .btn-primary {
  background: var(--amber);
  border-color: var(--amber);
  color: #fff;
}
.hero-product .btn-primary:hover {
  background: var(--amber-dark);
}
.hero-product .btn-outline {
  border-color: rgba(255,255,255,0.25);
  color: #fff;
}
.hero-product .btn-outline:hover {
  background: rgba(255,255,255,0.08);
}
.hero.hero-product .demo-window,
.hero.hero-product .cad-panel,
.hero.hero-product .check-panel,
.hero.hero-product .archive-panel,
.hero.hero-product .radar-panel {
  background: rgba(255,255,255,0.16);
  border-color: rgba(255,255,255,0.24);
  backdrop-filter: blur(6px);
  box-shadow: 0 24px 56px -34px rgba(15,23,42,0.56);
}
.hero.hero-product .code-mockup {
  background: rgba(7,16,34,0.64);
  border-color: rgba(255,255,255,0.20);
  backdrop-filter: blur(6px);
  box-shadow: 0 24px 56px -34px rgba(15,23,42,0.58);
}
.hero.hero-product .demo-titlebar,
.hero.hero-product .code-titlebar {
  background: rgba(255,255,255,0.14);
}
.hero.hero-product .cad-panel-tag,
.hero.hero-product .check-panel-tag,
.hero.hero-product .archive-panel-tag,
.hero.hero-product .radar-panel-tag {
  background: rgba(255,255,255,0.20);
  color: rgba(255,255,255,0.76);
}
.hero.hero-product .demo-dropzone,
.hero.hero-product .demo-filebar,
.hero.hero-product .demo-gencard,
.hero.hero-product .demo-progresscard {
  background: rgba(255,255,255,0.10);
  border-color: rgba(255,255,255,0.22);
}
.hero.hero-product .demo-stepdot,
.hero.hero-product .demo-selbtn,
.hero.hero-product .demo-fileicon,
.hero.hero-product .demo-genbtn,
.hero.hero-product .demo-btnprev {
  background: linear-gradient(180deg, #4D8EFF, #2F6FE8);
  box-shadow: 0 10px 24px -16px rgba(20,46,112,0.80);
}
.hero.hero-product .demo-droptext,
.hero.hero-product .demo-filename,
.hero.hero-product .demo-progtitle,
.hero.hero-product .demo-steplabel {
  color: #fff;
}
.hero.hero-product .demo-drophint,
.hero.hero-product .demo-filepages,
.hero.hero-product .demo-pathrow,
.hero.hero-product .demo-progtext,
.hero.hero-product .demo-titletext,
.hero.hero-product .demo-donetext {
  color: rgba(255,255,255,0.64);
}
.hero.hero-product .demo-btnexp {
  background: rgba(255,255,255,0.14);
  border-color: rgba(255,255,255,0.24);
}
.hero.hero-product .cad-list-item,
.hero.hero-product .check-progress-item,
.hero.hero-product .archive-list-item,
.hero.hero-product .radar-signal {
  padding: 10px 12px;
  margin-top: 8px;
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: 10px;
  background: rgba(255,255,255,0.06);
}
.hero.hero-product .cad-list-item:first-child,
.hero.hero-product .check-progress-item:first-child,
.hero.hero-product .archive-list-item:first-child,
.hero.hero-product .radar-signal:first-child {
  margin-top: 0;
}
.hero.hero-product .cad-list-item:last-child,
.hero.hero-product .radar-signal:last-child {
  border-bottom: 1px solid rgba(255,255,255,0.10);
}
.hero.hero-product .cad-list-item b {
  background: linear-gradient(180deg, rgba(255,255,255,0.96), rgba(232,240,255,0.92));
  color: var(--brand-dark);
}
.hero.hero-product .cad-list-item em,
.hero.hero-product .archive-item-status,
.hero.hero-product .check-item-status,
.hero.hero-product .radar-pattern {
  color: rgba(255,255,255,0.70);
}
.hero.hero-product .cad-bar,
.hero.hero-product .check-score-bar {
  background: rgba(255,255,255,0.18);
}
.hero.hero-product .check-score,
.hero.hero-product .archive-stat {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.10);
}
.hero.hero-product .code-titletext,
.hero.hero-product .code-body .cm {
  color: rgba(255,255,255,0.52);
}
.hero.hero-product .code-body {
  color: rgba(255,255,255,0.92);
}
.hero.hero-product .code-body .kw {
  color: #D9A8FF;
}
.hero.hero-product .code-body .str {
  color: #B8E4B9;
}
.hero.hero-product .code-body .tp {
  color: #8DC6FF;
}
.hero.hero-product .code-body .fn {
  color: #FFE08A;
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.5px;
  color: var(--amber);
  text-transform: uppercase;
  margin: 0 0 12px;
}
.hero-title {
  font-size: clamp(36px, 5vw, 52px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.5px;
  margin: 0 0 16px;
  color: #fff;
}
.hero-desc {
  font-size: 15px;
  line-height: 1.75;
  color: rgba(255,255,255,0.55);
  max-width: 500px;
  margin: 0 0 32px;
}
.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.hero-actions .btn-primary {
  background: var(--amber);
  color: #fff;
  border: none;
}
.hero-actions .btn-primary:hover {
  background: var(--amber-dark);
  color: #fff;
}
.hero-actions .btn-outline {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.25);
}
.hero-actions .btn-outline:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.4);
  color: #fff;
}
.hero-stats {
  display: flex;
  gap: 36px;
  margin-top: 36px;
}
.hero-stat-num {
  font-size: 28px;
  font-weight: 800;
  color: #fff;
}
.hero-stat-label {
  font-size: 12px;
  color: rgba(255,255,255,0.5);
}

.hero-visual { display: block; }
.hero-visual-mobile { display: none; }
.mobile-product-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 28px;
}
.mps-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 12px 8px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius);
  text-decoration: none;
  transition: background 0.2s;
}
.mps-item:hover { background: rgba(255,255,255,0.14); }
.mps-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
}
.mps-label {
  font-size: 11px;
  font-weight: 600;
  color: rgba(255,255,255,0.7);
  text-align: center;
  line-height: 1.3;
}
.hero-mockup {
  width: 100%;
  max-width: 440px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(12px);
}
.mockup-bar {
  height: 28px;
  background: rgba(255,255,255,0.08);
  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: 24px;
}
.mockup-icon-grid {
  display: grid;
  gap: 20px;
}
.mockup-icon-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  color: rgba(255,255,255,0.7);
  font-size: 12px;
  font-weight: 500;
  transition: color 0.2s;
}
.mockup-icon-item:hover { color: #fff; }
.mockup-icon {
  width: 52px;
  height: 52px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 800;
  color: #fff;
}
.mockup-icon.pdf-icon { background: linear-gradient(135deg,#6AA6FF,#2F6FE8); }
.mockup-icon.cad-icon { background: linear-gradient(135deg,#7AB0FF,#3C7BF0); }
.mockup-icon.sdk-icon { background: linear-gradient(135deg,#8DB9FF,#4285F4); }
.mockup-icon.check-icon { background: linear-gradient(135deg,#FFC88B,#F6A04D); font-size: 18px; }
.mockup-icon.archive-icon { background: linear-gradient(135deg,#345C98,#163566); font-size: 18px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
  line-height: 1.4;
  position: relative;
  overflow: hidden;
}
.btn-primary {
  background: var(--brand);
  color: #fff;
  border-color: var(--brand);
}
.btn-primary:hover {
  background: var(--brand-dark);
  border-color: var(--brand-dark);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--brand);
  border-color: var(--border);
}
.btn-outline:hover {
  background: var(--brand-bg);
  border-color: var(--brand);
  color: var(--brand);
}
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}
.btn-ghost:hover {
  background: var(--border-light);
  color: var(--heading);
}
.btn-lg {
  padding: 12px 32px;
  font-size: 15px;
}
.btn-sm {
  padding: 6px 14px;
  font-size: 12px;
}
.btn-amber {
  background: var(--amber);
  color: #fff;
  border-color: var(--amber);
}
.btn-amber:hover {
  background: var(--amber-dark);
  border-color: var(--amber-dark);
  color: #fff;
}
.btn-blue {
  background: linear-gradient(180deg, #295FCC, var(--brand-dark));
  color: #fff;
  box-shadow: 0 14px 28px -18px rgba(30,85,200,0.40);
}
.btn-blue:hover {
  background: linear-gradient(180deg, var(--brand-dark), #1749B5);
  color: #fff;
  transform: translateY(-1px);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  font-size: 11px;
  font-weight: 500;
  border-radius: var(--radius-sm);
}
.badge-blue { background: var(--brand-bg); color: var(--brand); }
.badge-amber { background: var(--amber-light); color: var(--amber-dark); }
.badge-green { background: #f0fdf4; color: #16a34a; }
.badge-purple { background: #f5f3ff; color: #6366f1; }

.section {
  padding: 100px 0;
}
.section-alt {
  background: var(--surface);
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}
.section-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.5px;
  color: var(--amber);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(24px, 3.5vw, 36px);
  font-weight: 700;
  color: var(--heading);
  margin: 0 0 12px;
  line-height: 1.25;
}
.section-subtitle {
  font-size: 15px;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.6;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* Navigation dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  padding-top: 8px;
  min-width: 200px;
}
.nav-dropdown:hover .nav-dropdown-menu { display: block; }
.nav-dropdown-menu a {
  display: block;
  padding: 10px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: none;
  font-size: 13px;
  color: var(--text);
}
.nav-dropdown-menu a:first-of-type {
  border-top: 1px solid var(--border);
  border-radius: 8px 8px 0 0;
}
.nav-dropdown-menu a:last-of-type {
  border-radius: 0 0 8px 8px;
}
.nav-dropdown-menu a:hover {
  background: var(--brand-bg);
  color: var(--brand);
}
.product-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 0;
  overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s;
  position: relative;
}
.product-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}
.product-card.featured {
  border-color: var(--brand-light);
  box-shadow: 0 0 0 1px rgba(37,99,235,0.10), var(--shadow);
}
.product-card.featured:hover {
  box-shadow: 0 0 0 1px rgba(37,99,235,0.16), var(--shadow-lg);
}
.product-card-bar {
  height: 3px;
}
.product-card-bar.blue { background: var(--brand); }
.product-card-bar.amber { background: var(--amber); }
.product-card-bar.green { background: var(--success); }
.product-card-bar.navy { background: var(--brand-deep); }
.product-card-bar.light-blue { background: var(--brand-light); }
.product-card-bar.purple { background: #6366f1; }

.product-card-body {
  padding: 24px;
}
.product-card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
}
.product-card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--heading);
  margin: 0 0 6px;
}
.product-card-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}
.product-tag {
  position: absolute;
  top: 20px;
  right: 20px;
  padding: 4px 12px;
  background: linear-gradient(180deg, #FFFFFF, #FFF7ED);
  color: #C56B12;
  border: 1px solid rgba(236,140,46,0.12);
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
}
.product-tag.primary {
  background: linear-gradient(180deg, #FFFFFF, #EFF6FF);
  color: var(--brand);
  border: 1px solid rgba(37,99,235,0.12);
}
.product-features {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
}
.product-features li {
  padding: 6px 0;
  font-size: 13px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 8px;
}
.product-features li::before {
  content: "✓";
  color: var(--success);
  font-weight: 700;
}
.product-features li:last-child {
  border-bottom: none;
}
.product-actions {
  display: flex;
  gap: 10px;
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.solution-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;
}
.solution-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.solution-tag {
  display: inline-block;
  padding: 3px 10px;
  background: var(--brand-bg);
  color: var(--brand);
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 12px;
}
.solution-card h3 {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--heading);
}
.solution-card p {
  margin: 0;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.65;
}

.advantage-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.advantage-item {
  padding: 24px;
  background: var(--bg);
  border-radius: var(--radius-lg);
  text-align: center;
}
.advantage-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  background: var(--surface);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  box-shadow: var(--shadow-sm);
}
.advantage-item h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--heading);
}
.advantage-item p {
  margin: 0;
  font-size: 13px;
  color: var(--text-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
}
.about-content .section-badge {
  display: inline-block;
  margin-bottom: 12px;
}
.about-text {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin: 0 0 16px;
}
.about-stats {
  display: flex;
  gap: 40px;
  margin-top: 32px;
}
.about-stat { text-align: left; }
.about-stat-num {
  display: block;
  font-size: 32px;
  font-weight: 800;
  color: var(--brand);
}
.about-stat-label {
  font-size: 13px;
  color: var(--text-muted);
}
.about-visual {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.about-card {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
}
.about-card-icon {
  font-size: 36px;
  margin-bottom: 12px;
}
.about-card h4 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--heading);
}
.about-card p {
  margin: 0;
  font-size: 12px;
  color: var(--text-secondary);
}

.overview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.overview-card,
.route-card,
.combo-card,
.contact-route-card,
.checklist-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow-sm);
}
.overview-card .section-badge,
.route-card .section-badge,
.combo-card .section-badge,
.contact-route-card .section-badge,
.checklist-card .section-badge {
  margin-bottom: 10px;
}
.overview-card h3,
.route-card h3,
.combo-card h3,
.contact-route-card h3,
.checklist-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--heading);
}
.overview-card p,
.route-card p,
.combo-card p,
.contact-route-card p,
.checklist-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-secondary);
}
.overview-card ul,
.route-card ul,
.combo-card ul,
.checklist-card ul {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}
.overview-card li,
.route-card li,
.combo-card li,
.checklist-card li {
  padding: 7px 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}
.overview-card li::before,
.route-card li::before,
.combo-card li::before,
.checklist-card li::before {
  content: "•";
  color: var(--brand-dark);
  font-weight: 700;
}
.overview-card li:last-child,
.route-card li:last-child,
.combo-card li:last-child,
.checklist-card li:last-child {
  border-bottom: none;
}
.overview-stat {
  display: block;
  margin-bottom: 12px;
  font-size: 28px;
  font-weight: 800;
  color: var(--brand-dark);
}
.route-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.combo-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.contact-route-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.checklist-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.summary-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 34px;
}
.page-split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 32px;
  align-items: stretch;
}
.page-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}
.page-panel h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--heading);
}
.page-panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-secondary);
}
.page-panel + .page-panel {
  margin-top: 18px;
}
.contact-mini-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.contact-mini-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}
.contact-mini-item strong {
  display: block;
  margin-bottom: 4px;
  font-size: 14px;
  color: var(--heading);
}
.contact-mini-item span,
.contact-mini-item a {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
  text-decoration: none;
}
.contact-mini-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--brand-bg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
}
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.contact-icon {
  width: 48px;
  height: 48px;
  background: var(--brand-bg);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.contact-item h4 {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 700;
  color: var(--heading);
}
.contact-item p {
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
}
.contact-form {
  padding: 0;
}
.contact-panel-desc,
.contact-panel-tip {
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
}
.contact-panel-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 16px;
}
.service-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px;
  gap: 20px;
  align-items: center;
  padding: 26px;
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(360px 180px at 0% 0%, rgba(66,133,244,0.10), transparent 58%),
    radial-gradient(240px 180px at 100% 0%, rgba(246,160,77,0.05), transparent 50%),
    linear-gradient(180deg, #FFFFFF 0%, #F6FAFF 100%);
  border: 1px solid rgba(148,163,184,0.16);
  box-shadow: var(--shadow);
}
.service-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(47,111,232,0.24), rgba(47,111,232,0.04) 42%, rgba(246,160,77,0.00));
  pointer-events: none;
}
.service-card-main {
  min-width: 0;
  position: relative;
  z-index: 1;
}
.service-card-badge {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  margin-bottom: 14px;
  border-radius: 999px;
  background: rgba(47,111,232,0.08);
  border: 1px solid rgba(47,111,232,0.12);
  color: var(--brand-dark);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.4px;
}
.service-card h3 {
  margin: 0 0 12px;
  font-size: 26px;
  font-weight: 800;
  color: var(--heading);
  line-height: 1.2;
}
.service-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}
.service-card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 20px 0 12px;
}
.service-card-points {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.service-card-points span {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,0.78);
  border: 1px solid rgba(148,163,184,0.16);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
}
.service-card-tip {
  font-size: 12px;
  color: var(--text-muted);
}
.service-card-qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 14px;
  border-radius: 20px;
  text-decoration: none;
  background: rgba(255,255,255,0.92);
  border: 1px solid rgba(148,163,184,0.16);
  box-shadow: var(--shadow-sm);
  position: relative;
  z-index: 1;
}
.service-card-qr img {
  display: block;
  width: 100%;
  max-width: 132px;
  height: auto;
  border-radius: 14px;
}
.service-card-qr strong {
  font-size: 15px;
  font-weight: 700;
  color: var(--heading);
}
.service-card-qr span {
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-muted);
  text-align: center;
}
.hero-visual .service-card {
  width: 100%;
  max-width: 500px;
}
.service-card--contact {
  grid-template-columns: minmax(0, 1fr) 192px;
  padding: 30px;
  gap: 22px;
}
.service-card--contact h3 {
  font-size: 28px;
}
.service-card--hero {
  padding: 22px;
  gap: 18px;
}
.service-card--hero h3 {
  font-size: 24px;
}
.service-card--hero .service-card-actions {
  margin: 18px 0 10px;
}
.service-card--hero .service-card-qr {
  padding: 12px;
  border-radius: 18px;
}
.service-card--hero .service-card-qr img {
  max-width: 120px;
}
.service-card--support {
  grid-template-columns: minmax(0, 1fr) 188px;
  padding: 30px;
}
.service-card--support h3 {
  font-size: 24px;
}
.service-card--support .service-card-actions {
  margin-bottom: 14px;
}
.hub-preview {
  max-width: 540px;
}
.hub-preview .mockup-content {
  padding: 22px 20px 20px;
}
.hub-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
.hub-flow-step {
  padding: 14px 14px 12px;
  border-radius: 18px;
  background: linear-gradient(180deg, #FFFFFF, #FBFCFF);
  border: 1px solid rgba(148,163,184,0.14);
  box-shadow: var(--shadow-sm);
}
.hub-flow-step.is-active {
  background: linear-gradient(180deg, #F5F9FF, #FFFFFF);
  border-color: rgba(47,111,232,0.18);
}
.hub-flow-step span {
  display: block;
  margin-bottom: 10px;
  font-size: 11px;
  font-weight: 700;
  color: var(--brand-dark);
  letter-spacing: 0.5px;
}
.hub-flow-step strong {
  display: block;
  margin-bottom: 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--heading);
}
.hub-flow-step p {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-secondary);
}
.hub-product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.hub-product-card {
  padding: 15px 16px;
  border-radius: 18px;
  background: rgba(255,255,255,0.92);
  border: 1px solid rgba(148,163,184,0.14);
}
.hub-product-card em {
  display: inline-block;
  margin-bottom: 8px;
  font-style: normal;
  font-size: 11px;
  font-weight: 700;
  color: var(--brand-dark);
  letter-spacing: 0.4px;
}
.hub-product-card strong {
  display: block;
  margin-bottom: 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--heading);
}
.hub-product-card p,
.hub-note {
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-secondary);
}
.hub-note {
  margin-top: 14px;
  padding: 0 2px;
}
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-group.full {
  grid-column: 1 / -1;
}
.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}
.form-group input,
.form-group textarea {
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(66,133,244,0.12);
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}
.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.site-footer {
  background: var(--brand-deep);
  color: rgba(255,255,255,0.6);
  padding: 48px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 32px;
}
.footer-brand p {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255,255,255,0.5);
}
.footer-links h4 {
  margin: 0 0 16px;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
}
.footer-links a {
  display: block;
  margin-bottom: 10px;
}
.site-footer .logo {
  color: #fff;
  font-size: 16px;
}
.site-footer .logo-mark {
  background-color: #fff;
  padding: 2px;
}
.site-footer a {
  color: rgba(255,255,255,0.55);
  font-size: 13px;
}
.site-footer a:hover {
  color: var(--amber);
}
.footer-bottom {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 12px;
  color: rgba(255,255,255,0.3);
  text-align: center;
}
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
}

@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-content { max-width: 100%; }
  .hero-desc { max-width: 100%; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-visual { display: none; }
  .download-page-hero .hero-visual { display: block; }
  .hero-visual-mobile { display: block; }

  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .solution-grid { grid-template-columns: repeat(2, 1fr); }
  .advantage-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .overview-grid { grid-template-columns: repeat(2, 1fr); }
  .route-grid { grid-template-columns: repeat(2, 1fr); }
  .combo-grid { grid-template-columns: 1fr; }
  .contact-route-grid { grid-template-columns: 1fr; }
  .checklist-grid { grid-template-columns: repeat(2, 1fr); }
  .page-split { grid-template-columns: 1fr; }
  .about-visual { max-width: 400px; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .download-summary-grid,
  .download-spec-grid { grid-template-columns: repeat(2, 1fr); }
  .support-banner { flex-direction: column; align-items: flex-start; }
  .service-card { grid-template-columns: 1fr; }
  .service-card-qr {
    width: 176px;
    justify-self: flex-start;
  }
  .service-card--contact,
  .service-card--support { padding: 24px; }
  .hub-flow { grid-template-columns: 1fr; }

  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .scene-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .knowledge-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .tutorial-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .download-grid { grid-template-columns: repeat(2, 1fr); }

  .hero-product .hero-inner {
    grid-template-columns: 1fr;
  }
}



@media (max-width: 768px) {
  /* ===== 布局 ===== */
  .container { padding: 0 16px; }
  .section { padding: 64px 0; }
  .section-head { margin-bottom: 32px; }

  /* ===== 导航 ===== */
  .site-header {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: rgba(255, 255, 255, 0.96);
  }

  .nav { display: none; }
  .nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    z-index: 199;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 16px;
    gap: 12px;
    box-shadow: var(--shadow);
  }

  .nav a {
    display: block;
    padding: 16px 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--heading);
    border-bottom: 1px solid var(--border);
    border-radius: 0;
  }
  .nav a:hover {
    color: var(--brand);
    background: transparent;
    border-bottom-color: var(--border);
  }
  .nav a:last-child {
    border-bottom: none;
  }

  .nav-dropdown > a::after {
    margin-left: auto;
  }
  .nav-dropdown-menu {
    position: static;
    display: none;
    padding-top: 0;
    box-shadow: none;
    padding: 0 0 12px 16px;
    background: transparent;
    border-radius: 0;
  }
  .nav-dropdown.open .nav-dropdown-menu { display: block; }
  .nav-dropdown-menu a {
    padding: 12px 0;
    font-size: 14px;
    color: var(--text-secondary);
  }
  .nav-dropdown-menu a:hover {
    color: var(--brand);
  }

  .btn-header { display: none; }
  .header-inner { position: relative; }

  /* 汉堡菜单按钮 */
  .menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    gap: 5px;
    border-radius: var(--radius-sm);
    transition: background 0.2s;
  }
  .menu-toggle:hover {
    background: rgba(66, 133, 244, 0.08);
  }
  .menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--heading);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }
  .menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  .menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* 遮罩层 */
  .nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 198;
    opacity: 0;
    transition: opacity 0.3s ease;
  }
  .nav-overlay.open {
    display: block;
    opacity: 1;
  }

  body { overscroll-behavior: none; }

  /* ===== Hero ===== */
  .hero { padding: 64px 0 80px; }
  .hero-title { font-size: clamp(28px, 6vw, 40px); }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .hero-product { padding: 64px 0 80px; }

  .hero-label { font-size: 12px; margin-bottom: 12px; }
  .hero-desc { font-size: 15px; margin-bottom: 24px; }
  .hero-stats { gap: 16px; margin-top: 28px; flex-wrap: wrap; }
  .hero-stat { flex: 1 1 calc(33.333% - 12px); min-width: 0; }
  .hero-stat-num { font-size: clamp(18px, 5.2vw, 22px); line-height: 1.3; }
  .hero-stat-label { font-size: 11px; line-height: 1.4; }
  .hero.hero-product .hero-stats { gap: 12px; margin-top: 24px; }
  .hero.hero-product .hero-stat { flex: 1 1 calc(33.333% - 8px); min-width: 0; padding-top: 10px; }

  /* ===== Grid ===== */
  .product-grid { grid-template-columns: 1fr; }
  .solution-grid { grid-template-columns: 1fr; }
  .advantage-grid { grid-template-columns: 1fr; }
  .overview-grid { grid-template-columns: 1fr; }
  .route-grid { grid-template-columns: 1fr; }
  .checklist-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .scene-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .faq-grid { grid-template-columns: 1fr; }
  .knowledge-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .tutorial-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr; }
  .download-grid { grid-template-columns: 1fr; }
  .download-summary-grid,
  .download-spec-grid { grid-template-columns: 1fr; }
  .page-split { grid-template-columns: 1fr; }
  .tutorial-layout { grid-template-columns: 1fr; }
  .tutorial-sidebar { position: static; }
  .steps-extended { flex-direction: column; }
  .step-arrow { display: none; }

  /* ===== Section ===== */
  .section-title { font-size: clamp(22px, 5.5vw, 28px); }
  .section-subtitle { font-size: 14px; }

  /* ===== 按钮 ===== */
  .btn { padding: 10px 20px; font-size: 14px; }
  .btn-lg { padding: 12px 24px; font-size: 14px; }

  /* ===== 卡片统一内边距 ===== */
  .product-card-body { padding: 22px; }
  .product-card-icon { width: 40px; height: 40px; margin-bottom: 12px; font-size: 11px; }
  .product-card-title { font-size: 18px; }
  .product-actions { flex-wrap: wrap; }
  .product-actions .btn { flex: 1 1 auto; min-width: 120px; }

  .solution-card,
  .advantage-item,
  .overview-card,
  .route-card,
  .combo-card,
  .contact-route-card,
  .checklist-card,
  .feature-card,
  .scene-card,
  .step-card,
  .case-card,
  .knowledge-card,
  .faq-item,
  .news-card,
  .tutorial-card,
  .download-card { padding: 20px; }

  /* ===== 关于我们 ===== */
  .about-stats { flex-wrap: wrap; gap: 20px; }
  .about-stat-num { font-size: 26px; }
  .about-text { font-size: 14px; }
  .about-visual { max-width: 100%; gap: 12px; }
  .about-card { padding: 18px; }

  /* ===== 服务卡片 ===== */
  .service-card,
  .service-card--contact,
  .service-card--support { padding: 22px; gap: 18px; }
  .service-card h3 { font-size: 22px; }
  .service-card--contact h3 { font-size: 22px; }
  .service-card--support h3 { font-size: 20px; }
  .service-card-actions { gap: 8px; margin: 16px 0 10px; }
  .service-card-actions .btn { flex: 1 1 auto; min-width: 120px; }
  .service-card-qr { width: 100%; max-width: 220px; margin: 4px auto 0; }

  /* ===== Hub Flow ===== */
  .hub-flow { grid-template-columns: 1fr; gap: 10px; }
  .hub-flow-step { padding: 12px; }

  /* ===== 案例 ===== */
  .case-result { gap: 12px; }
  .case-stat-num { font-size: 20px; }

  /* ===== 步骤 ===== */
  .step-num { width: 38px; height: 38px; font-size: 16px; margin-bottom: 12px; }
  .step-num-large { width: 42px; height: 42px; font-size: 18px; margin-bottom: 12px; }

  /* ===== 表格 ===== */
  .compare-table { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .compare-table th,
  .compare-table td { padding: 10px 14px; font-size: 13px; white-space: nowrap; }

  /* ===== 表单 ===== */
  .form-grid { gap: 12px; }
  .form-group input,
  .form-group textarea { padding: 11px 14px; font-size: 16px; }

  /* ===== 下载页 ===== */
  .download-page-hero { padding: 48px 0 56px; }
  .download-page-hero .hero-inner { gap: 28px; }
  .download-summary-card,
  .download-spec-card { padding: 18px; }
  .support-banner { padding: 22px; gap: 16px; }
  .support-banner h3 { font-size: 20px; }
  .support-actions { width: 100%; }

  /* ===== 页脚 ===== */
  .site-footer { padding: 36px 0 20px; }
  .site-footer .container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .footer-bottom-links { flex-wrap: wrap; gap: 14px; }

  /* ===== Mockup ===== */
  .hero-mockup { max-width: 100%; }
  .mockup-content { padding: 32px 18px; }
  .mockup-icon { width: 48px; height: 48px; }

  /* ===== 摘要 ===== */
  .summary-actions { gap: 10px; }
  .summary-actions .btn { flex: 1 1 auto; min-width: 140px; }
}

@media (max-width: 480px) {
  .container { padding: 0 14px; }

  .hero { padding: 48px 0 64px; }
  .hero.hero-product { padding: 48px 0 56px; }
  .hero-title { font-size: clamp(22px, 7.5vw, 28px); }
  .hero-desc { font-size: 14px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .hero-stats { gap: 20px; margin-top: 22px; }
  .hero-stat { flex: 1 1 calc(50% - 6px); min-width: 0; }
  .hero-stat-num { font-size: 22px; }

  .section { padding: 48px 0; }
  .section-head { margin-bottom: 24px; }
  .section-title { font-size: clamp(20px, 5vw, 28px); }
  .section-subtitle { font-size: 13px; }

  .product-grid { gap: 16px; }

  .product-card-body,
  .solution-card,
  .advantage-item,
  .overview-card,
  .route-card,
  .combo-card,
  .contact-route-card,
  .checklist-card,
  .feature-card,
  .scene-card,
  .step-card,
  .case-card,
  .knowledge-card,
  .faq-item,
  .news-card,
  .tutorial-card,
  .download-card { padding: 18px; }

  .product-actions { flex-direction: column; }
  .product-actions .btn { width: 100%; }

  .about-stats { flex-wrap: wrap; gap: 16px; }
  .about-stat { flex: 1 1 calc(50% - 8px); }

  .service-card,
  .service-card--contact,
  .service-card--support { padding: 18px; }
  .service-card h3,
  .service-card--contact h3 { font-size: 20px; }

  .summary-actions { flex-direction: column; }
  .summary-actions .btn { width: 100%; }

  .footer-bottom-links { justify-content: center; }

  .header-inner { height: 56px; }
  .nav.open { top: 56px; }
  .logo { font-size: 16px; }
  .logo-mark { width: 32px; height: 32px; }
}

/* .section-badge, .section-head, .section-title, .section-subtitle are defined above (lines 540-563) */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s, box-shadow 0.25s;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.feature-icon {
  width: 52px;
  height: 52px;
  background: var(--brand-bg);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}
.feature-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--heading);
}
.feature-card p {
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.scene-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.scene-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}
.scene-tag {
  display: inline-block;
  padding: 4px 10px;
  background: var(--brand-bg);
  color: var(--brand);
  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: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.step-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--brand);
  color: #fff;
  border-radius: 50%;
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 16px;
}
.step-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--heading);
}
.step-card p {
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
}
.faq-q {
  font-size: 15px;
  font-weight: 700;
  color: var(--heading);
  margin-bottom: 8px;
}
.faq-a {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.result-strip {
  display: flex;
  gap: 40px;
  justify-content: center;
  flex-wrap: wrap;
}
.result-item {
  flex: 1;
  min-width: 200px;
  max-width: 320px;
  padding: 24px 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.result-item strong {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--heading);
  margin-bottom: 6px;
}
.result-item span {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.trust-banner {
  padding: 32px 0;
  text-align: center;
}
.trust-label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.trust-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}
.trust-logo {
  padding: 10px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
}

.compare-table {
  background: var(--surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.compare-table table {
  width: 100%;
  border-collapse: collapse;
}
.compare-table th,
.compare-table td {
  padding: 14px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
  font-size: 14px;
}
.compare-table th {
  background: var(--bg);
  font-weight: 700;
  color: var(--heading);
}
.compare-table td {
  color: var(--text-secondary);
}
.compare-table td.highlight {
  background: var(--brand-bg);
  color: var(--brand);
  font-weight: 600;
}
.compare-table th.highlight {
  background: var(--brand-light);
  color: var(--brand);
}
.compare-table tbody tr:hover {
  background: var(--bg);
}

.steps-extended {
  display: flex;
  align-items: flex-start;
  gap: 20px;
}
.step-item {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
}
.step-num-large {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  background: var(--brand);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 800;
}
.step-content h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--heading);
}
.step-content p {
  margin: 0 0 12px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.step-arrow {
  font-size: 24px;
  color: var(--brand-dark);
  padding-top: 80px;
  flex-shrink: 0;
}
.os-badge, .format-tag, .output-badge {
  display: inline-block;
  padding: 4px 10px;
  background: var(--brand-bg);
  color: var(--brand);
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  margin: 2px;
}
.output-badge.success {
  background: #E8F5E9;
  color: var(--success);
}
.step-features-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
}
.step-features-list span {
  padding: 4px 10px;
  background: var(--bg);
  border-radius: 6px;
  font-size: 11px;
  color: var(--text-secondary);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}
.case-logo {
  font-size: 15px;
  font-weight: 700;
  color: var(--heading);
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
}
.case-quote {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}
.case-result {
  display: flex;
  gap: 20px;
}
.case-stat {
  flex: 1;
  text-align: center;
  padding: 12px;
  background: var(--bg);
  border-radius: var(--radius);
}
.case-stat-num {
  display: block;
  font-size: 24px;
  font-weight: 800;
  color: var(--brand);
}
.case-stat-label {
  font-size: 11px;
  color: var(--text-muted);
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}
.faq-item h3 {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 700;
  color: var(--heading);
}
.faq-item p {
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.knowledge-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}
.knowledge-icon {
  font-size: 36px;
  margin-bottom: 16px;
}
.knowledge-card h3 {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 700;
  color: var(--heading);
}
.knowledge-card p {
  margin: 0;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.news-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(2, 1fr);
  gap: 24px;
}
.news-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}
.news-card.main {
  grid-row: span 2;
}
.news-date {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.news-card h3 {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 700;
  color: var(--heading);
  line-height: 1.4;
}
.news-card p {
  margin: 0 0 16px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.news-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--brand);
}

.tutorial-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.tutorial-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s, box-shadow 0.25s;
  display: block;
  text-decoration: none;
}
.tutorial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.tutorial-icon {
  font-size: 32px;
  margin-bottom: 12px;
}
.tutorial-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--heading);
}
.tutorial-card p {
  margin: 0 0 16px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.tutorial-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--brand);
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.download-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
}
.download-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, #FFFFFF, #F6FAFF);
  border: 1px solid rgba(148,163,184,0.14);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}
.download-card h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--heading);
}
.download-card p {
  margin: 0 0 16px;
  font-size: 13px;
  color: var(--text-muted);
}
.download-card .download-meta {
  display: block;
  margin: -4px 0 14px;
  font-size: 12px;
  color: var(--text-muted);
}
.download-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  margin: 0 0 16px;
}
.download-tags span {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  background: linear-gradient(180deg, #FFFFFF, #FAFCFF);
  border: 1px solid rgba(148,163,184,0.14);
  border-radius: 999px;
  font-size: 11px;
  color: var(--text-secondary);
}
.download-page-hero {
  background:
    radial-gradient(760px 360px at 0% 0%, rgba(66,133,244,0.12), transparent 60%),
    radial-gradient(540px 320px at 92% 12%, rgba(246,160,77,0.045), transparent 50%),
    linear-gradient(180deg, #FCFDFF 0%, #F4F8FD 100%);
  color: var(--heading);
  padding: 72px 0 84px;
  border-bottom: 1px solid rgba(148,163,184,0.14);
}
.download-page-hero .hero-inner {
  align-items: stretch;
  grid-template-columns: minmax(0, 1.02fr) minmax(500px, 0.98fr);
  gap: 48px;
}
.download-page-hero .hero-content {
  max-width: 560px;
}
.download-page-hero .hero-label {
  color: var(--brand);
}
.download-page-hero .hero-title {
  color: var(--heading);
}
.download-page-hero .hero-desc {
  color: var(--text-secondary);
}
.download-page-hero .hero-actions .btn-outline {
  border-color: var(--border);
  color: var(--brand);
}
.download-page-hero .hero-actions .btn-outline:hover {
  background: var(--brand-bg);
  border-color: var(--brand);
}
.download-page-hero .hero-actions .btn-primary {
  background: var(--amber);
  color: #fff;
}
.download-page-hero .hero-mockup {
  max-width: 540px;
}
.download-page-hero .mockup-content {
  padding: 28px 24px 30px;
}
.download-page-hero .download-summary-grid {
  grid-template-columns: 1fr;
  gap: 12px;
}
.download-summary-grid,
.download-spec-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.download-summary-card,
.download-spec-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}
.download-page-hero .download-summary-card {
  padding: 18px 18px 16px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  min-height: 0;
  background: linear-gradient(180deg, #FFFFFF, #FBFCFF);
  border-color: rgba(148,163,184,0.16);
}
.download-summary-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}
.download-summary-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(47,111,232,0.14), rgba(47,111,232,0.06));
  border: 1px solid rgba(47,111,232,0.12);
  color: var(--brand-dark);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.4px;
}
.download-summary-card strong,
.download-spec-card h3 {
  display: block;
  margin-bottom: 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--heading);
}
.download-page-hero .download-summary-card strong {
  margin: 0;
  line-height: 1.35;
}
.download-summary-card span,
.download-spec-card p,
.download-spec-card li {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.download-summary-copy {
  margin: 0;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.8;
}
.download-spec-card ul {
  margin: 12px 0 0;
  padding-left: 18px;
}
.download-spec-card li + li {
  margin-top: 6px;
}
.download-note {
  margin: 18px 0 0;
  text-align: center;
  font-size: 13px;
  color: var(--text-secondary);
}
.support-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 32px;
  border-radius: var(--radius-xl);
  background:
    radial-gradient(460px 240px at 0% 0%, rgba(66,133,244,0.10), transparent 58%),
    radial-gradient(320px 220px at 100% 0%, rgba(246,160,77,0.04), transparent 52%),
    linear-gradient(180deg, #FFFFFF 0%, #F5F9FF 100%);
  color: var(--heading);
  border: 1px solid rgba(148,163,184,0.16);
  box-shadow: var(--shadow);
}
.support-banner h3 {
  margin: 0 0 10px;
  font-size: 24px;
  font-weight: 800;
}
.support-banner p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}
.support-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.support-actions .btn-outline {
  border-color: rgba(47,111,232,0.18);
}

.form-select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  cursor: pointer;
}
.form-select:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(66,133,244,0.12);
}

.footer-bottom-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 12px;
}
.footer-bottom-links a {
  font-size: 12px;
  color: rgba(255,255,255,0.5);
  text-decoration: none;
}
.footer-bottom-links a:hover {
  color: #fff;
}
.footer-social {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}
.social-link {
  padding: 6px 14px;
  background: rgba(255,255,255,0.1);
  border-radius: 999px;
  font-size: 12px;
  color: rgba(255,255,255,0.7);
  text-decoration: none;
}
.social-link:hover {
  background: rgba(255,255,255,0.2);
  color: #fff;
}

.qrcode {
  width: 100px;
  height: 100px;
  background: var(--bg);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 12px;
}
.qrcode-link {
  width: auto;
  min-height: 48px;
  padding: 0 18px;
  background: var(--brand-bg);
  color: var(--brand);
  font-size: 14px;
  font-weight: 700;
}
.qrcode-link:hover {
  background: #DCE5FF;
  color: var(--brand);
}

/* ===== 增强交互动效 - 2026-04-16 ===== */

/* 1. 卡片弹性悬停效果 */
.product-card {
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
              box-shadow 0.3s ease,
              border-color 0.3s ease;
}
.product-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px -8px rgba(37, 99, 235, 0.15);
  border-color: var(--brand);
}
.product-card.featured:hover {
  transform: translateY(-2px);
  box-shadow: 0 28px 56px -14px rgba(37, 99, 235, 0.30);
  border-color: var(--brand);
}

/* 其他卡片悬停效果 */
.solution-card,
.feature-card,
.tutorial-card,
.download-card,
.case-card,
.knowledge-card,
.scene-card,
.step-card,
.faq-item,
.news-card {
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
              box-shadow 0.3s ease,
              border-color 0.3s ease;
}
.solution-card:hover,
.feature-card:hover,
.tutorial-card:hover,
.download-card:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 20px 40px -10px rgba(66, 133, 244, 0.20);
}

/* 2. 页面滚动淡入动画 */
.fade-in-section {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}
.fade-in-section.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 交错动画延迟 */
.fade-in-section:nth-child(1) { transition-delay: 0s; }
.fade-in-section:nth-child(2) { transition-delay: 0.1s; }
.fade-in-section:nth-child(3) { transition-delay: 0.2s; }
.fade-in-section:nth-child(4) { transition-delay: 0.3s; }
.fade-in-section:nth-child(5) { transition-delay: 0.4s; }
.fade-in-section:nth-child(6) { transition-delay: 0.5s; }

/* 3. 表单状态反馈 */
.form-group input,
.form-group textarea {
  transition: border-color 0.25s ease,
              box-shadow 0.25s ease,
              background-color 0.25s ease;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 4px rgba(66, 133, 244, 0.15);
  background: #fff;
}
.form-group.success input,
.form-group.success textarea {
  border-color: var(--success);
  background: #F0FDF4;
}
.form-group.success input:focus,
.form-group.success textarea:focus {
  box-shadow: 0 0 0 4px rgba(22, 163, 74, 0.15);
}
.form-group.error input,
.form-group.error textarea {
  border-color: var(--error);
  background: #FEF2F2;
}
.form-group.error input:focus,
.form-group.error textarea:focus {
  box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.15);
}
.form-group .error-message {
  font-size: 12px;
  color: var(--error);
  margin-top: 4px;
}
.form-group .success-message {
  font-size: 12px;
  color: var(--success);
  margin-top: 4px;
}

/* 4. 按钮点击涟漪效果 */
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle, rgba(255,255,255,0.4) 0%, transparent 70%);
  transform: scale(0);
  opacity: 0;
  transition: transform 0.5s, opacity 0.5s;
}
.btn:active::after {
  transform: scale(2.5);
  opacity: 1;
  transition: transform 0s, opacity 0s;
}

.btn:active {
  transform: scale(0.97);
}

.btn, .nav a, .product-card, .solution-card, .feature-card, .tutorial-card, .download-card, .nav-card, .related-link, .cert-thumbnail {
  touch-action: manipulation;
}

/* 5. 数字计数器动画 */
.hero-stat-num,
.about-stat-num,
.case-stat-num {
  transition: transform 0.3s ease;
}
.hero-stat-num:hover,
.about-stat-num:hover {
  transform: scale(1.05);
}

/* ===== 通用悬停效果工具类 ===== */

/* 链接卡片悬停（边框+颜色） */
.related-link {
  display: block;
  padding: 12px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s;
}
.related-link:hover {
  border-color: var(--brand);
  color: var(--brand);
}

/* 产品导航卡片悬停 */
.product-nav-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 20px 12px;
  background: #fff;
  border: 1px solid #E0E8F6;
  border-radius: 14px;
  box-shadow: 0 2px 10px rgba(14,31,72,0.05);
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}
.product-nav-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(14,31,72,0.1);
}

/* 软著缩略图悬停 */
.cert-thumbnail {
  display: block;
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 8px 20px -8px rgba(15,23,42,0.25);
  transition: transform 0.2s, box-shadow 0.2s;
}
.cert-thumbnail:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 30px -8px rgba(15,23,42,0.35);
}

/* 解决方案/下载卡片悬停 */
.nav-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  background: #fff;
  border: 1px solid #E0E8F6;
  border-radius: 14px;
  box-shadow: 0 2px 12px rgba(14,31,72,0.06);
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}
.nav-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(14,31,72,0.1);
}

/* nav-card 子元素响应式 */
.nav-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
}
.nav-card-body {
  flex: 1;
  min-width: 0;
}
.nav-card-title {
  font-size: 15px;
  font-weight: 700;
  color: #14213D;
  margin-bottom: 3px;
}
.nav-card-desc {
  font-size: 12px;
  color: #8B97B2;
  line-height: 1.4;
}
.nav-card-arrow {
  color: #C0CCDF;
  font-size: 18px;
  flex-shrink: 0;
}
.nav-card-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  width: 100%;
}
@media (max-width: 480px) {
  .nav-card { padding: 14px 16px; gap: 12px; }
  .nav-card-icon { width: 40px; height: 40px; font-size: 13px; }
  .nav-card-title { font-size: 14px; }
  .nav-card-desc { font-size: 11px; }
}

/* 资质横幅悬停 */
.cert-banner {
  display: flex;
  margin-top: 48px;
  padding: 24px 32px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 32px;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}
.cert-banner:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px -10px rgba(14,31,72,0.15);
}

/* 产品图标悬停缩放 */
.mockup-icon-item {
  transition: transform 0.2s !important;
}
.mockup-icon-item:hover {
  transform: scale(1.08) !important;
}

/* 页脚版权链接 */
.footer-bottom a {
  color: rgba(255, 255, 255, 0.5);
}
.footer-bottom a:hover {
  color: rgba(255, 255, 255, 0.8);
}

/* ===== 文章页 ===== */
.article-hero {
  background: linear-gradient(135deg, #0f1d36 0%, #1e3a5f 100%);
  color: #fff;
  padding: 64px 0;
  text-align: center;
}
.article-hero .hero-title {
  font-size: clamp(24px, 3vw, 36px);
  margin: 0 0 8px;
}
.article-meta {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  margin-top: 12px;
}
.article-meta a {
  color: var(--amber);
  text-decoration: none;
}
.article-meta a:hover {
  text-decoration: underline;
}

.article-body {
  max-width: 780px;
  margin: 0 auto;
  padding: 48px 0 80px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text);
}
.article-body p { margin: 0 0 16px; }
.article-body h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--heading);
  margin: 36px 0 12px;
}
.article-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--heading);
  margin: 28px 0 10px;
}
.article-body h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--heading);
  margin: 40px 0 16px;
}
.article-body h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--heading);
  margin: 32px 0 12px;
}
.article-body p {
  margin: 0 0 16px;
}
.article-body ul, .article-body ol {
  margin: 0 0 16px;
  padding-left: 24px;
}
.article-body li {
  margin-bottom: 6px;
}
.article-body img {
  border-radius: var(--radius);
  margin: 24px 0;
}

.article-cta {
  background: var(--brand-bg);
  border: 1px solid rgba(37,99,235,0.12);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  margin-top: 48px;
}
.article-cta-card .btn-amber {
  background: var(--amber);
  color: #fff;
  border: none;
}

/* ===== 可访问性优化 - 2026-04-16 ===== */

/* 1. 焦点可见性 - 键盘导航支持 */
*:focus {
  outline: none;
}

*:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

/* 链接焦点样式 */
a:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
  border-radius: 4px;
}

/* 按钮焦点样式 */
.btn:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
}

/* 表单焦点样式 */
.form-group input:focus-visible,
.form-group textarea:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 0;
}

/* 导航焦点样式 */
.nav a:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: -2px;
}

/* 2. 跳过导航链接（提升可访问性） */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--brand);
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  z-index: 9999;
  transition: top 0.3s;
}
.skip-link:focus {
  top: 10px;
}

/* 3. ARIA 相关样式 */
[aria-expanded="true"] {
  /* 展开状态样式 */
}

[aria-selected="true"] {
  /* 选中状态样式 */
}

[aria-hidden="true"] {
  display: none !important;
}

/* 4. 屏幕阅读器专用文本 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.sr-only-focusable:focus,
.sr-only-focusable:active {
  position: static;
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* 5. 减少动画（尊重用户偏好） */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .fade-in-section {
    opacity: 1;
    transform: none;
  }
  
  .btn::after {
    display: none;
  }
}

/* 6. 高对比度模式支持 */
@media (prefers-contrast: high) {
  :root {
    --border: rgba(0, 0, 0, 0.5);
    --text-secondary: #333;
    --text-muted: #666;
  }
  
  .product-card,
  .solution-card,
  .feature-card {
    border-width: 2px;
    border-color: var(--heading);
  }
}

/* ===== 行业资讯列表 ===== */
.news-filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 36px;
}
.news-filter-btn {
  padding: 9px 26px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.news-filter-btn:hover { border-color: var(--brand-light); color: var(--brand); }
.news-filter-btn.active {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.28);
}
.news-cat {
  display: inline-block;
  vertical-align: middle;
  margin-right: 8px;
  padding: 2px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.6;
}
.news-cat-company { background: #fef2f2; color: #dc2626; }
.news-cat-policy { background: #fffbeb; color: #d97706; }
.news-cat-industry { background: var(--brand-bg); color: var(--brand); }
.news-card[data-category] { align-items: flex-start; }
/* 资讯列表卡片：统一内边距，修复首条顶部无间距、内容贴边 */
.news-list .news-card { padding: 24px; }
.news-list .news-card:first-child { padding-top: 24px; }
.news-thumb {
  flex-shrink: 0;
  width: 200px;
  aspect-ratio: 16 / 9;
  margin-top: 2px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.news-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .3s; }
.news-thumb:hover img { transform: scale(1.05); }
.article-cover {
  width: 100%;
  max-width: 780px;
  border-radius: 14px;
  border: 1px solid var(--border);
  margin: 0 auto 28px;
  display: block;
}
@media (max-width: 640px) { .news-thumb { width: 100%; } }
.news-list { display: flex; flex-direction: column; gap: 0; }
.news-card {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
}
.news-card:first-child { padding-top: 0; }
.news-date {
  flex-shrink: 0;
  width: 60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 4px;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.4;
}
.news-date-day { font-size: 24px; font-weight: 800; color: var(--brand); line-height: 1.1; }
.news-date-month { font-size: 12px; color: var(--text-muted); }
.news-body { flex: 1; min-width: 0; }
.news-title { font-size: 18px; font-weight: 700; margin: 0 0 8px; line-height: 1.4; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.news-title .news-cat { margin-right: 0; }
.news-title a { color: var(--heading); text-decoration: none; }
.news-title a:hover { color: var(--brand); }
.news-summary { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin: 0 0 10px; }
.news-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.news-tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--brand-bg);
  color: var(--brand);
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}
.news-source { font-size: 12px; color: var(--text-muted); }
.news-empty { text-align: center; padding: 60px 0; color: var(--text-muted); }
.news-pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.news-page-info { font-size: 14px; color: var(--text-muted); }
.news-rss-entry { text-align: center; margin-top: 24px; }

/* ===== 文章详情 ===== */
.article-tags { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.article-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.85);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
}

/* ===== 相关文章 ===== */
.news-related {
  max-width: 780px;
  margin: 48px auto 0;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.news-related h3 { font-size: 16px; font-weight: 700; color: var(--heading); margin: 0 0 16px; }
.news-related-list { display: flex; flex-direction: column; gap: 10px; }
.news-related-item {
  display: flex;
  gap: 12px;
  align-items: baseline;
  text-decoration: none;
  color: var(--text);
  font-size: 14px;
  padding: 8px 0;
}
.news-related-item:hover { color: var(--brand); }
.news-related-date { flex-shrink: 0; font-size: 12px; color: var(--text-muted); }
.news-back { max-width: 780px; margin: 32px auto 0; text-align: center; }

@media (max-width: 768px) {
  .news-card { flex-direction: column; gap: 8px; }
  .news-date { width: auto; flex-direction: row; gap: 6px; }
  .news-date-day { font-size: 16px; }
}

/* ===== 下载页 Hero 响应式（放在 base 规则之后，确保覆盖） ===== */
@media (max-width: 1180px) {
  .download-page-hero .hero-inner { grid-template-columns: 1fr; }
  .download-page-hero .hero-content,
  .download-page-hero .hero-desc,
  .download-page-hero .hero-mockup { max-width: 100% !important; }
  .download-page-hero .hero-content { text-align: center; }
  .download-page-hero .hero-actions { justify-content: center; }
}