/* ============================================
   睿联信科技 — 企业官网 全局样式
   设计系统：深色渐变 Hero + 科技蓝 + 工业灰
   参考设计：现代企业官网风格
   ============================================ */

/* === CSS Variables === */
:root {
  --primary: #1a56db;
  --primary-dark: #1e429f;
  --primary-light: #e8f0fe;
  --dark: #1e293b;
  --dark-bg: #0f172a;
  --dark-bg-light: #1e293b;
  --gray: #64748b;
  --gray-light: #94a3b8;
  --light-gray: #f1f5f9;
  --bg-alt: #f8fafc;
  --border: #e2e8f0;
  --success: #16a34a;
  --success-light: #dcfce7;
  --warning: #f59e0b;
  --accent: #0ea5e9;
  --white: #ffffff;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --radius-pill: 9999px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 50px rgba(0,0,0,0.15);
  --font-cn: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-en: "Inter", system-ui, -apple-system, sans-serif;
  --max-width: 1280px;
  --header-height: 72px;
  --transition: 0.25s ease;
}

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-cn);
  color: var(--dark);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }

img { max-width: 100%; height: auto; display: block; }

ul { list-style: none; }

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

.text-center { text-align: center; }

/* === Typography === */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.3; color: var(--dark); }
h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; }

/* ============================================
   NAVBAR - 固定顶部导航栏
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--dark-bg);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  box-shadow: 0 1px 4px rgba(0,0,0,0.15);
  z-index: 1000;
  transition: box-shadow var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--white);
}
.nav-logo:hover { color: var(--white); }

.logo-img { height: 48px; width: auto; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  color: rgba(255,255,255,0.75);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
  position: relative;
}
.nav-link:hover {
  color: var(--white);
  background: rgba(255,255,255,0.08);
}
.nav-link.active {
  color: var(--white);
  border-bottom-color: var(--white);
  border-radius: 0;
}

.nav-cta {
  margin-left: 8px;
}

/* 汉堡菜单按钮 */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
  z-index: 1001;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  font-family: inherit;
  line-height: 1.4;
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
}
.btn-primary:hover {
  background: var(--primary-dark);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.4);
}
.btn-outline:hover {
  background: var(--white);
  color: var(--dark);
  border-color: var(--white);
  transform: translateY(-1px);
}

.btn-outline-dark {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline-dark:hover {
  background: var(--primary);
  color: var(--white);
}

.btn-lg { padding: 16px 36px; font-size: 1.05rem; }
.btn-sm { padding: 8px 20px; font-size: 0.85rem; }

/* ============================================
   HERO 区域
   ============================================ */
.hero {
  padding: calc(var(--header-height) + 100px) 0 100px;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 40%, #1a1a2e 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(26,86,219,0.15) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-pill);
  color: #cbd5e1;
  font-size: 0.9rem;
  margin-bottom: 28px;
  backdrop-filter: blur(4px);
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  display: inline-block;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 20px;
  line-height: 1.2;
}

.hero-title .highlight {
  color: #3b82f6;
  position: relative;
}

.hero-desc {
  font-size: 1.15rem;
  color: #94a3b8;
  max-width: 680px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  max-width: 720px;
  margin: 0 auto;
  padding-top: 48px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.hero-stat-item {
  text-align: center;
}

.hero-stat-num {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--white);
  font-family: var(--font-en);
  line-height: 1.2;
}

.hero-stat-label {
  font-size: 0.9rem;
  color: #64748b;
  margin-top: 4px;
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
  padding: 60px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-gray {
  background: var(--light-gray);
}

/* 三段式标题区域 */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
  line-height: 1.3;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--gray);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ============================================
   GRID 系统
   ============================================ */
.grid {
  display: grid;
  gap: 24px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ============================================
   FEATURE CARDS
   ============================================ */
.feature-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s ease;
  position: relative;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.feature-icon {
  font-size: 36px;
  line-height: 1;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--gray);
  line-height: 1.7;
}

/* ============================================
   STATS BAND - 数据统计带
   ============================================ */
.stats-band {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  padding: 64px 0;
  color: var(--white);
}

.stat-box {
  text-align: center;
}

.stat-box .num {
  font-size: 3rem;
  font-weight: 800;
  color: var(--white);
  font-family: var(--font-en);
  line-height: 1.2;
}

.stat-box .label {
  font-size: 0.95rem;
  color: #94a3b8;
  margin-top: 8px;
}

/* ============================================
   BRAND CARDS
   ============================================ */
.brand-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.brand-card {
  display: block;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: all 0.3s ease;
  color: inherit;
}

.brand-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
  color: inherit;
}

.brand-logo {
  height: 60px;
  width: auto;
  max-width: 100%;
  margin: 0 auto 12px;
  display: block;
  object-fit: contain;
}

.brand-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 6px;
}

.brand-card p {
  font-size: 0.9rem;
  color: var(--gray);
}

/* ============================================
   PRODUCT CARDS
   ============================================ */
.product-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s ease;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.product-header {
  padding: 28px 24px 20px;
  background: var(--bg-alt);
  text-align: center;
}

.product-header .icon {
  font-size: 36px;
  margin-bottom: 12px;
  line-height: 1;
}

.product-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 4px;
}

.product-header .desc {
  font-size: 0.85rem;
  color: var(--gray);
  font-family: var(--font-en);
}

.product-body {
  padding: 20px 24px 24px;
}

.product-features {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.product-features li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--gray);
}

.product-features li .dot {
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
  flex-shrink: 0;
}

.product-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--primary);
  transition: gap var(--transition);
}
.product-link:hover { gap: 8px; color: var(--primary-dark); }

.stock-tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--success-light);
  color: var(--success);
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
}

/* ============================================
   PROCESS FLOW - 采购流程
   ============================================ */
.process-flow {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}

.process-step {
  text-align: center;
  position: relative;
  padding: 20px 12px;
}

.process-step::after {
  content: '';
  position: absolute;
  top: 32px;
  right: -10px;
  width: 20px;
  height: 2px;
  background: var(--border);
}

.process-step:last-child::after { display: none; }

.process-num {
  font-size: 2.5rem;
  font-weight: 800;
  font-family: var(--font-en);
  color: #e2e8f0;
  line-height: 1;
  margin-bottom: 12px;
}

.process-step h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 6px;
}

.process-step p {
  font-size: 0.85rem;
  color: var(--gray);
  line-height: 1.5;
}

/* ============================================
   CTA SECTION - 行动号召
   ============================================ */
.cta-section {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  padding: 100px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 50% 50%, rgba(26,86,219,0.12) 0%, transparent 60%);
  pointer-events: none;
}

.cta-inner {
  position: relative;
  z-index: 1;
}

.cta-inner h2 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
}

.cta-inner p {
  font-size: 1.1rem;
  color: #94a3b8;
  max-width: 560px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.cta-inner .btn {
  margin: 0 8px;
}

.cta-inner .btn-primary {
  background: var(--primary);
  color: var(--white);
}
.cta-inner .btn-primary:hover {
  background: #2563eb;
}

.cta-inner .btn-outline {
  color: #94a3b8;
  border-color: rgba(255,255,255,0.2);
}
.cta-inner .btn-outline:hover {
  color: var(--dark);
  background: var(--white);
  border-color: var(--white);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 72px 0 32px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .nav-logo {
  color: var(--white);
  margin-bottom: 16px;
}
.footer-brand .nav-logo:hover { color: var(--white); }

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 20px;
  color: #64748b;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.06);
  border-radius: 50%;
  font-size: 1.1rem;
  transition: background var(--transition);
}
.footer-social a:hover {
  background: rgba(255,255,255,0.12);
}

.footer-col h4 {
  color: var(--white);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul li {
  font-size: 0.9rem;
  color: #94a3b8;
}

.footer-col a {
  color: #94a3b8;
  font-size: 0.9rem;
  transition: color var(--transition);
}
.footer-col a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: #64748b;
}

/* ============================================
   BACK TO TOP
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transform: translateY(10px);
  transition: all var(--transition);
  pointer-events: none;
  z-index: 999;
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */
.fade-up {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

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

/* ============================================
   LEGACY STYLES - 保持兼容
   ============================================ */

/* === Legacy Header (兼容 .header 选择器) === */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--white);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
  z-index: 1000;
  transition: box-shadow var(--transition);
}
.header.scrolled { box-shadow: var(--shadow-md); }

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo { display: flex; align-items: center; gap: 10px; }
.logo img { height: 40px; width: auto; }
.logo span { font-size: 1.25rem; font-weight: 700; color: var(--dark); }

.nav { display: flex; align-items: center; gap: 32px; }
.nav a {
  color: var(--gray);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.nav a:hover, .nav a.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.nav-cta {
  background: var(--primary) !important;
  color: var(--white) !important;
  padding: 10px 24px !important;
  border-radius: 50px !important;
  border: none !important;
  font-weight: 600 !important;
  transition: background var(--transition), transform var(--transition) !important;
}
.nav-cta:hover {
  background: var(--primary-dark) !important;
  transform: translateY(-1px);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--dark);
  margin: 5px 0;
  transition: var(--transition);
  border-radius: 2px;
}

/* === Legacy Section Title === */
.section-title {
  text-align: center;
  margin-bottom: 48px;
}
.section-title h2 {
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}
.section-title h2::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: var(--primary);
  margin: 12px auto 0;
  border-radius: 2px;
}
.section-title p {
  color: var(--gray);
  font-size: 1.05rem;
}

/* === Legacy Cards === */
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
}

.card-icon {
  width: 52px;
  height: 52px;
  background: var(--primary-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 1.5rem;
}

.card-grid { display: grid; gap: 24px; }

/* === Legacy Stats Bar === */
.stats-bar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 48px 0;
  color: var(--white);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}
.stat-number { font-size: 2.5rem; font-weight: 800; font-family: var(--font-en); }
.stat-label { font-size: 0.95rem; opacity: 0.85; margin-top: 4px; }

/* === Legacy Brand / Product Grid === */
.brand-grid, .product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.brand-card, .product-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: all var(--transition);
}
.brand-card:hover, .product-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.brand-card img, .product-card img {
  height: 60px;
  margin: 0 auto 12px;
  object-fit: contain;
}
.brand-card h4 { font-size: 1rem; margin-bottom: 4px; }
.brand-card .country { color: var(--gray); font-size: 0.85rem; }
.brand-card .tags { margin-top: 8px; }

.tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 0.8rem;
  margin: 2px;
}

/* === Legacy Product Card === */
.product-card { text-align: left; }
.product-card .model { color: var(--gray); font-size: 0.85rem; margin: 4px 0; }
.product-card .brand { font-weight: 600; font-size: 0.9rem; }
.product-card .delivery {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
  margin-top: 8px;
}
.delivery-stock { background: #dcfce7; color: var(--success); }
.delivery-order { background: #fef3c7; color: #b45309; }

/* === Legacy Filter Bar === */
.filter-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 32px;
  padding: 20px;
  background: var(--light-gray);
  border-radius: var(--radius);
}
.filter-bar select, .filter-bar input {
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  background: var(--white);
  min-width: 140px;
}
.filter-bar input { flex: 1; min-width: 200px; }

/* === Legacy Article Card === */
.article-card {
  display: flex;
  gap: 20px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
  margin-bottom: 16px;
}
.article-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.article-card .article-meta {
  color: var(--gray);
  font-size: 0.85rem;
  display: flex;
  gap: 16px;
}
.article-card .article-summary {
  color: var(--gray);
  margin-top: 8px;
  font-size: 0.95rem;
}

/* === Legacy Breadcrumb === */
.breadcrumb {
  padding: calc(var(--header-height) + 20px) 0 20px;
  font-size: 0.9rem;
  color: var(--gray);
}
.breadcrumb a { color: var(--gray); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 8px; }

/* === Legacy Page Header === */
.page-header {
  padding: calc(var(--header-height) + 40px) 0 40px;
  background: linear-gradient(135deg, #f0f5ff 0%, #f8fafc 100%);
  text-align: center;
}
.page-header h1 { margin-bottom: 8px; }
.page-header p { color: var(--gray); font-size: 1.05rem; }

/* === Legacy Content Section === */
.section { padding: 60px 0; }
.section-gray { background: var(--light-gray); }

/* === Legacy Contact Page === */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-info-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  padding: 16px;
  background: var(--light-gray);
  border-radius: var(--radius-sm);
}
.contact-icon {
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  font-size: 0.9rem;
}
.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color var(--transition);
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
.form-group textarea { min-height: 120px; resize: vertical; }

/* === Legacy Service Flow === */
.flow-steps {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}
.flow-step {
  text-align: center;
  position: relative;
}
.flow-step::after {
  content: '→';
  position: absolute;
  right: -12px;
  top: 20px;
  color: var(--gray);
  font-size: 1.2rem;
}
.flow-step:last-child::after { display: none; }
.flow-step .step-num {
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  font-weight: 700;
  font-family: var(--font-en);
}
.flow-step h4 { font-size: 0.9rem; }

/* === Legacy CTA === */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 64px 0;
  text-align: center;
  color: var(--white);
}
.cta-section h2 { color: var(--white); margin-bottom: 12px; }
.cta-section p { opacity: 0.9; margin-bottom: 24px; }
.cta-section .btn-primary { background: var(--white); color: var(--primary); }
.cta-section .btn-primary:hover { background: var(--light-gray); }

/* === Legacy Article Detail === */
.article-detail {
  padding: 40px 0 80px;
}
.article-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}
.article-header h1 { margin-bottom: 12px; }
.article-body { max-width: 800px; }
.article-body h2 { margin-top: 40px; margin-bottom: 16px; }
.article-body h3 { margin-top: 28px; margin-bottom: 12px; }
.article-body p { margin-bottom: 16px; }
.article-body ul, .article-body ol { margin-bottom: 16px; padding-left: 24px; }
.article-body li { margin-bottom: 8px; list-style: disc; }
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}
.article-body th, .article-body td {
  border: 1px solid var(--border);
  padding: 10px 14px;
  text-align: left;
}
.article-body th {
  background: var(--light-gray);
  font-weight: 600;
}
.article-body blockquote {
  border-left: 4px solid var(--primary);
  padding: 12px 20px;
  margin: 20px 0;
  background: var(--light-gray);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--gray);
}
.article-toc {
  background: var(--light-gray);
  padding: 20px 24px;
  border-radius: var(--radius);
  margin-bottom: 32px;
}
.article-toc h4 { margin-bottom: 12px; }
.article-toc ol { padding-left: 20px; }
.article-toc li { margin-bottom: 4px; font-size: 0.9rem; }

/* === Legacy FAQ === */
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  overflow: hidden;
}
.faq-question {
  padding: 16px 20px;
  font-weight: 600;
  cursor: pointer;
  background: var(--white);
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}
.faq-question:hover { background: var(--light-gray); }
.faq-question::after { content: '+'; font-size: 1.3rem; color: var(--gray); }
.faq-item.open .faq-question::after { content: '−'; }
.faq-answer { padding: 0 20px 16px; color: var(--gray); display: none; }
.faq-item.open .faq-answer { display: block; }

/* === Legacy Pagination === */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}
.pagination a, .pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  transition: all var(--transition);
}
.pagination a:hover { background: var(--primary-light); border-color: var(--primary); }
.pagination .active { background: var(--primary); color: var(--white); border-color: var(--primary); }

/* === Legacy Category Tabs === */
.category-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.category-tabs a {
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.9rem;
  border: 1px solid var(--border);
  color: var(--gray);
  transition: all var(--transition);
}
.category-tabs a:hover, .category-tabs a.active {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

/* ============================================
   PAGE HERO - 内页头部
   ============================================ */
.page-hero {
  padding: calc(var(--header-height) + 30px) 0 30px;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 40%, #1a1a2e 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(26,86,219,0.12) 0%, transparent 60%);
  pointer-events: none;
}
.page-hero-content {
  position: relative;
  z-index: 1;
}
.page-hero-content h1 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 12px;
}
.page-hero-content > p {
  font-size: 1.1rem;
  color: #94a3b8;
  max-width: 600px;
  margin: 0 auto;
}
.page-hero-content .breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin-top: 20px;
  padding: 0;
  font-size: 0.9rem;
  color: #64748b;
}
.page-hero-content .breadcrumb a {
  color: #94a3b8;
  transition: color var(--transition);
}
.page-hero-content .breadcrumb a:hover { color: var(--white); }
.page-hero-content .breadcrumb .sep {
  margin: 0 4px;
  color: #475569;
}

/* ============================================
   FILTER BAR (新版) - 内页筛选栏
   ============================================ */
.filter-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 32px;
  padding: 20px;
  background: var(--light-gray);
  border-radius: var(--radius);
  align-items: center;
}
.filter-bar input {
  flex: 1;
  min-width: 200px;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  background: var(--white);
  font-family: inherit;
  transition: border-color var(--transition);
}
.filter-bar input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
.filter-bar select {
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  background: var(--white);
  min-width: 140px;
  font-family: inherit;
  cursor: pointer;
  transition: border-color var(--transition);
}
.filter-bar select:focus {
  outline: none;
  border-color: var(--primary);
}

/* 筛选按钮 */
.filter-btn {
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.9rem;
  border: 1px solid var(--border);
  background: var(--white);
  color: var(--gray);
  cursor: pointer;
  font-family: inherit;
  transition: all var(--transition);
  white-space: nowrap;
}
.filter-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.filter-btn.active {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

/* ============================================
   PRODUCT FILTER - 产品页筛选
   ============================================ */
.product-filter {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  padding: 16px;
  background: var(--light-gray);
  border-radius: var(--radius);
}
.product-filter input {
  flex: 1;
  min-width: 200px;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  background: var(--white);
  font-family: inherit;
  transition: border-color var(--transition);
}
.product-filter input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
.product-filter select {
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  background: var(--white);
  min-width: 140px;
  font-family: inherit;
  cursor: pointer;
  transition: border-color var(--transition);
}
.product-filter select:focus {
  outline: none;
  border-color: var(--primary);
}

/* ============================================
   PRODUCT TABLE - 产品列表表格
   ============================================ */
.product-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.product-table thead {
  background: #0f172a;
  color: var(--white);
}
.product-table th {
  padding: 14px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
}
.product-table td {
  padding: 14px 18px;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
  color: var(--dark);
}
.product-table tbody tr {
  transition: background var(--transition);
}
.product-table tbody tr:hover {
  background: var(--light-gray);
}
.product-table tbody tr:last-child td {
  border-bottom: none;
}
.product-table .model {
  font-family: var(--font-en);
  font-size: 0.85rem;
  color: var(--gray);
  font-weight: 500;
}
.product-table .origin {
  white-space: nowrap;
}
.product-table .product-link {
  color: var(--primary);
  font-weight: 500;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition);
}
.product-table .product-link:hover {
  gap: 8px;
  color: var(--primary-dark);
}

/* ============================================
   PRODUCT DETAIL - 产品详情页
   ============================================ */
.product-detail-wrap {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: start;
}
.product-detail-image {
  width: 100%;
  aspect-ratio: 1;
  background: var(--light-gray);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 80px;
}
.product-detail-info h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
}
.product-detail-info .model {
  font-family: var(--font-en);
  font-size: 1.2rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 20px;
}
.product-detail-info .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}
.product-detail-info .meta-item {
  padding: 6px 14px;
  background: var(--light-gray);
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  color: var(--dark);
}
.product-detail-info .meta-item strong {
  color: var(--dark);
}

/* 规格参数表 */
.specs-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
}
.specs-table td {
  padding: 10px 14px;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
}
.specs-table td:first-child {
  font-weight: 600;
  color: var(--dark);
  width: 120px;
  background: var(--light-gray);
}
.specs-table tr:last-child td {
  border-bottom: none;
}

/* 产品询价框 */
.product-inquiry {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  border-radius: var(--radius);
  padding: 24px;
  color: var(--white);
}
.product-inquiry h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 8px;
}
.product-inquiry p {
  font-size: 0.9rem;
  color: #94a3b8;
  margin-bottom: 16px;
}
.product-inquiry .btn-outline {
  color: var(--white);
  border-color: rgba(255,255,255,0.3);
}
.product-inquiry .btn-outline:hover {
  background: var(--white);
  color: var(--dark);
}

/* ============================================
   ARTICLE CARD (新版) - 知识库列表
   ============================================ */
.article-card {
  display: flex;
  gap: 24px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
  margin-bottom: 0;
}
.article-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.article-image {
  width: 80px;
  height: 80px;
  min-width: 80px;
  background: var(--light-gray);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  flex-shrink: 0;
}
.article-content {
  flex: 1;
  min-width: 0;
}
.article-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 8px;
  line-height: 1.4;
}
.article-content h3 a {
  color: inherit;
  transition: color var(--transition);
}
.article-content h3 a:hover {
  color: var(--primary);
}
.article-content .summary {
  font-size: 0.9rem;
  color: var(--gray);
  line-height: 1.7;
  margin-bottom: 12px;
}

/* 文章标签 */
.article-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
.article-tag {
  display: inline-block;
  padding: 3px 10px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

/* 文章元信息行 */
.article-meta {
  color: var(--gray);
  font-size: 0.85rem;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.article-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  color: var(--gray);
  font-size: 0.9rem;
  margin-top: 12px;
}

/* 文章作者 */
.article-author {
  display: flex;
  align-items: center;
  gap: 10px;
}
.article-author .avatar {
  width: 40px;
  height: 40px;
  background: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  flex-shrink: 0;
}
.article-author .info {
  line-height: 1.4;
}

/* ============================================
   ARTICLE DETAIL - 文章详情页
   ============================================ */
.article-detail {
  max-width: 800px;
  margin: 0 auto;
}
.article-detail .article-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}
.article-detail .article-header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.3;
}
.article-detail h2 {
  font-size: 1.5rem;
  margin-top: 36px;
  margin-bottom: 16px;
  color: var(--dark);
}
.article-detail h3 {
  font-size: 1.2rem;
  margin-top: 28px;
  margin-bottom: 12px;
}
.article-detail p {
  margin-bottom: 16px;
  line-height: 1.8;
  color: var(--dark);
}
.article-detail ul, .article-detail ol {
  margin-bottom: 16px;
  padding-left: 24px;
}
.article-detail li {
  margin-bottom: 8px;
  list-style: disc;
  line-height: 1.7;
}
.article-detail table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}
.article-detail th, .article-detail td {
  border: 1px solid var(--border);
  padding: 10px 14px;
  text-align: left;
  font-size: 0.9rem;
}
.article-detail th {
  background: var(--light-gray);
  font-weight: 600;
}

/* 简短回答框 */
.answer-box {
  background: var(--primary-light);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 20px 24px;
  margin-bottom: 28px;
}
.answer-box p {
  margin-bottom: 0;
  color: var(--dark);
  line-height: 1.8;
}

/* 关键要点 */
.key-takeaways {
  background: var(--light-gray);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 28px;
}
.key-takeaways h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--dark);
}
.key-takeaways ul {
  padding-left: 20px;
  margin-bottom: 0;
}
.key-takeaways li {
  margin-bottom: 6px;
  font-size: 0.9rem;
  color: var(--dark);
  line-height: 1.6;
}

/* ============================================
   BRAND DETAIL - 品牌详情页
   ============================================ */
.brand-hero {
  background: var(--bg-alt);
  padding: 40px 0;
  border-bottom: 1px solid var(--border);
}
.brand-hero-inner {
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand-logo-lg {
  width: 80px;
  height: 80px;
  background: var(--white);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  box-shadow: var(--shadow);
  flex-shrink: 0;
}
.brand-hero-inner h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 4px;
}
.brand-hero-inner .meta {
  font-size: 0.95rem;
  color: var(--gray);
  margin-bottom: 10px;
}
.brand-hero-inner .tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.brand-tag {
  display: inline-block;
  padding: 3px 12px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

/* 品牌内容区 */
.brand-section {
  padding: 60px 0;
}
.brand-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--dark);
}
.brand-section p {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--dark);
  margin-bottom: 12px;
  max-width: 800px;
}
.brand-section.section-alt {
  background: var(--bg-alt);
}

/* ============================================
   GRID-1 - 单列网格
   ============================================ */
.grid-1 {
  display: grid;
  grid-template-columns: 1fr;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
  .footer-top { grid-template-columns: 1fr 1fr; }
  .flow-steps { grid-template-columns: repeat(3, 1fr); }
  .flow-step::after { display: none; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .process-flow { grid-template-columns: repeat(3, 1fr); }
  .process-step::after { display: none; }
  .brand-grid { grid-template-columns: repeat(3, 1fr); }
  .product-detail-wrap { grid-template-columns: 1fr; }
  .product-detail-image { max-width: 200px; }
  .brand-hero-inner { flex-direction: column; text-align: center; }
  .brand-hero-inner .tags { justify-content: center; }
}

@media (max-width: 768px) {
  /* 基础排版 */
  h1 { font-size: 2rem; }
  h2 { font-size: 1.6rem; }

  /* 导航 - 移动端汉堡菜单 */
  .nav-menu {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--dark-bg);
    padding: 24px;
    flex-direction: column;
    gap: 4px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    box-shadow: var(--shadow-lg);
    z-index: 999;
  }
  .nav-menu.open {
    display: flex;
  }
  .nav-link {
    padding: 12px 16px;
    width: 100%;
    border-radius: var(--radius-sm);
  }
  .nav-link.active {
    border-bottom-color: transparent;
    background: rgba(255,255,255,0.12);
    color: var(--white);
    border-radius: var(--radius-sm);
  }
  .nav-cta {
    margin-left: 0;
    margin-top: 8px;
    width: 100%;
  }
  .nav-cta .btn {
    width: 100%;
    justify-content: center;
  }
  .nav-toggle { display: flex; }

  /* 旧版导航兼容 */
  .nav { display: none; }
  .nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--white);
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
  }
  .mobile-toggle { display: block; }

  /* Hero */
  .hero {
    padding: calc(var(--header-height) + 60px) 0 60px;
  }
  .hero-title { font-size: 2rem; }
  .hero-desc { font-size: 1rem; }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    padding-top: 32px;
  }
  .hero-stat-num { font-size: 2rem; }
  .hero-actions { flex-direction: column; align-items: center; }

  /* Section */
  .section { padding: 40px 0; }
  .section-title { font-size: 1.75rem; }
  .section-header { margin-bottom: 40px; }

  /* Grid */
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }

  /* Brand Grid */
  .brand-grid { grid-template-columns: repeat(2, 1fr); }

  /* Process Flow */
  .process-flow { grid-template-columns: repeat(3, 1fr); }

  /* CTA */
  .cta-section { padding: 60px 0; }
  .cta-inner h2 { font-size: 1.75rem; }
  .cta-inner .btn { display: block; margin: 8px auto; max-width: 240px; }

  /* Footer */
  .footer-top { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }

  /* Stats */
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-number { font-size: 1.8rem; }

  /* Product Grid */
  .brand-grid, .product-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .filter-bar { flex-direction: column; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }

  .hero-title { font-size: 1.7rem; }
  .hero-stats { grid-template-columns: 1fr 1fr; gap: 16px; }
  .hero-stat-num { font-size: 1.8rem; }
  .hero-badge { font-size: 0.8rem; padding: 5px 14px; }

  .section-title { font-size: 1.5rem; }

  .brand-grid { grid-template-columns: 1fr 1fr; }

  .process-flow { grid-template-columns: repeat(2, 1fr); }

  .card-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .flow-steps { grid-template-columns: repeat(2, 1fr); }
  .article-card { flex-direction: column; }
  .article-image { width: 100%; height: 120px; }

  .page-hero-content h1 { font-size: 1.8rem; }
  .product-table { font-size: 0.8rem; }
  .product-table th, .product-table td { padding: 10px 12px; }
  .product-filter { flex-direction: column; }
  .product-filter select { min-width: auto; }
  .article-detail .article-header h1 { font-size: 1.5rem; }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
}