/* ============================================================
   吉瓦科技 GWGrid Technology - 主样式表
   品牌橙色系设计系统 · 响应式 · 现代简洁风格
   ============================================================ */

/* ---- CSS 设计令牌 (Design Tokens) ---- */
:root {
  /* 品牌主色系 — 橙色渐变 */
  --orange-900: #BF360C;
  --orange-800: #E65100;
  --orange-700: #F4511E;
  --orange-600: #FF6D00;
  --orange-500: #FF7043;
  --orange-400: #FF8A65;
  --orange-300: #FFAB91;
  --orange-200: #FFCC80;
  --orange-100: #FFE0B2;
  --orange-50:  #FFF3E0;
  --orange-25:  #FFFAF5;
  --orange-10:  #FFFDF9;

  /* 深色辅助色 */
  --navy-900: #1A1A2E;
  --navy-800: #16213E;
  --navy-700: #0F3460;
  --brown-900: #3E2723;
  --brown-800: #4E342E;
  --brown-700: #5D4037;
  --brown-500: #795548;
  --brown-300: #A1887F;

  /* 中性色 */
  --white:     #FFFFFF;
  --off-white: #FFFBF7;
  --gray-100:  #F5F6FA;
  --gray-200:  #E8EAED;
  --gray-300:  #BDC1C6;
  --gray-500:  #9AA0A6;
  --gray-700:  #5F6368;
  --gray-900:  #202124;

  /* 阴影层级 */
  --shadow-sm: 0 2px 8px rgba(191, 54, 12, 0.08);
  --shadow-md: 0 4px 16px rgba(191, 54, 12, 0.10);
  --shadow-lg: 0 8px 32px rgba(191, 54, 12, 0.12);
  --shadow-xl: 0 16px 48px rgba(191, 54, 12, 0.15);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* 间距标尺 */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* 布局 */
  --max-width: 1200px;
  --header-height: 72px;
  --header-height-scrolled: 64px;

  /* 字体 */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', Consolas, monospace;

  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family-base);
  color: var(--brown-800);
  background: var(--orange-10);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  text-decoration: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

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

/* ---- Skip Link (无障碍) ---- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--orange-800);
  color: var(--white);
  padding: 8px 16px;
  z-index: 9999;
  font-size: 14px;
}
.skip-link:focus {
  top: 0;
}

/* ==================== HEADER ==================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--orange-100);
  height: var(--header-height);
  transition: height var(--transition-base), box-shadow var(--transition-base);
}
.header.scrolled {
  box-shadow: var(--shadow-sm);
  height: var(--header-height-scrolled);
}

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

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-img {
  height: 38px;
  width: auto;
}
.logo-text {
  display: none;
}

/* 主导航 */
.nav {
  display: flex;
  gap: 4px;
  align-items: center;
}
.nav-link {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--brown-700);
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.nav-link:hover,
.nav-link.active {
  background: var(--orange-50);
  color: var(--orange-700);
}

/* 语言切换 */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: var(--space-md);
  padding: 4px;
  background: var(--gray-100);
  border-radius: var(--radius-sm);
}
.lang-switch a {
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-500);
  transition: all var(--transition-fast);
}
.lang-switch a.active {
  background: var(--white);
  color: var(--orange-700);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.lang-switch a:hover:not(.active) {
  color: var(--brown-700);
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--brown-800);
  border-radius: 2px;
  transition: all var(--transition-base);
}
.menu-toggle.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.menu-toggle.open span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ==================== HERO ==================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--navy-900) 0%, var(--orange-800) 50%, var(--orange-700) 100%);
  overflow: hidden;
  padding-top: var(--header-height);
}

/* Hero 背景装饰 */
.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}
.hero-circle {
  position: absolute;
  border-radius: 50%;
  background: var(--orange-300);
  opacity: 0.12;
}
.hero-circle.c1 { width: 600px; height: 600px; top: -200px; left: -150px; }
.hero-circle.c2 { width: 450px; height: 450px; top: 35%; right: -100px; }
.hero-circle.c3 { width: 350px; height: 350px; bottom: -80px; left: 35%; }
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* Hero 内容 */
.hero-content {
  position: relative;
  z-index: 2;
  padding: 80px var(--space-lg);
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}
.hero-subtitle {
  font-size: clamp(14px, 2vw, 16px);
  color: var(--orange-200);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: var(--space-lg);
}
.hero-title {
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 800;
  color: var(--white);
  line-height: 1.15;
  margin-bottom: var(--space-lg);
  letter-spacing: -1px;
}
.hero-desc {
  font-size: clamp(16px, 2.5vw, 18px);
  color: var(--orange-100);
  max-width: 640px;
  margin: 0 auto var(--space-2xl);
  line-height: 1.8;
}

/* Hero 数据指标 */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: clamp(24px, 5vw, 56px);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}
.stat-item {
  text-align: center;
}
.stat-num {
  display: block;
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 800;
  color: var(--white);
  line-height: 1.2;
}
.stat-label {
  display: block;
  font-size: 13px;
  color: var(--orange-200);
  margin-top: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Hero 按钮 */
.hero-btns {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ==================== BUTTONS ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  font-family: inherit;
  gap: 8px;
}
.btn-primary {
  background: var(--white);
  color: var(--orange-800);
  border-color: var(--white);
}
.btn-primary:hover {
  background: var(--orange-25);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.4);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--white);
  transform: translateY(-2px);
}
.btn-orange {
  background: var(--orange-700);
  color: var(--white);
  border-color: var(--orange-700);
}
.btn-orange:hover {
  background: var(--orange-800);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-block {
  width: 100%;
}

/* ==================== SECTIONS ==================== */
.section {
  padding: clamp(60px, 8vw, 100px) 0;
}
.section-alt {
  background: var(--white);
}
.section-dark {
  background: linear-gradient(135deg, var(--navy-800), var(--orange-800));
  color: var(--white);
}
.section-header {
  text-align: center;
  margin-bottom: clamp(40px, 6vw, 64px);
}
.section-header.light .section-title,
.section-header.light .section-desc {
  color: var(--white);
}
.section-header.light .section-tag {
  background: rgba(255,255,255,0.15);
  color: var(--orange-200);
}
.section-tag {
  display: inline-block;
  padding: 6px 18px;
  border-radius: 20px;
  background: var(--orange-50);
  color: var(--orange-700);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: var(--space-md);
}
.section-title {
  font-size: clamp(28px, 4.5vw, 40px);
  font-weight: 800;
  color: var(--brown-900);
  margin-bottom: 12px;
  letter-spacing: -0.5px;
  line-height: 1.2;
}
.section-desc {
  font-size: clamp(15px, 2vw, 17px);
  color: var(--brown-300);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
}

/* 子标题 */
.subsection-title {
  font-size: clamp(20px, 3vw, 24px);
  font-weight: 700;
  color: var(--orange-700);
  margin: var(--space-2xl) 0 var(--space-lg);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--orange-100);
}

/* ==================== ABOUT ==================== */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-2xl);
  align-items: center;
}
.about-text p {
  margin-bottom: var(--space-md);
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.9;
  color: var(--brown-700);
}
.about-list {
  margin-top: var(--space-lg);
  display: grid;
  gap: 10px;
}
.about-list li {
  padding: 14px 18px;
  background: var(--white);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--orange-500);
  font-size: 14px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast);
}
.about-list li:hover {
  transform: translateX(4px);
}
.about-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.about-card img {
  width: 100%;
  height: 380px;
  object-fit: cover;
}
.about-card-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-lg);
  background: linear-gradient(transparent, rgba(26, 26, 46, 0.85));
  color: var(--white);
}
.about-card-overlay span {
  font-size: 13px;
  opacity: 0.8;
}
.about-card-overlay strong {
  display: block;
  font-size: 20px;
  margin-top: 4px;
}

/* 企业文化卡片 */
.culture-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
}
.culture-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border-top: 4px solid var(--orange-500);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.culture-card:nth-child(2) { border-top-color: var(--orange-400); }
.culture-card:nth-child(3) { border-top-color: var(--orange-600); }
.culture-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.culture-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
}
.culture-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.culture-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--brown-900);
  margin-bottom: var(--space-sm);
}
.culture-card p {
  font-size: 14px;
  color: var(--brown-500);
  line-height: 1.7;
}

/* ==================== PRODUCTS ==================== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}
.product-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  border-top: 3px solid var(--orange-300);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}
.product-card.featured {
  border-top-color: var(--orange-700);
  border-top-width: 4px;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.product-img {
  width: 100%;
  height: 180px;
  background: linear-gradient(180deg, var(--orange-25) 0%, var(--white) 100%);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}
.product-img::after {
  content: "";
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 6px;
  background: rgba(0,0,0,0.04);
  border-radius: 50%;
}
.product-img img {
  max-width: 90%;
  max-height: 150px;
  object-fit: contain;
  position: relative;
  z-index: 1;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.06));
}
.product-card h4 {
  font-size: 18px;
  font-weight: 700;
  color: var(--orange-800);
  margin-bottom: 4px;
}
.product-tag {
  font-size: 12px;
  color: var(--brown-300);
  margin-bottom: 12px;
  font-weight: 500;
}
.product-card ul {
  margin-bottom: var(--space-md);
}
.product-card li {
  font-size: 13px;
  color: var(--brown-700);
  padding: 3px 0;
  line-height: 1.6;
}
.product-card li::before {
  content: "• ";
  color: var(--orange-500);
}
.product-scene {
  display: inline-block;
  margin-top: var(--space-sm);
  padding: 4px 12px;
  background: var(--orange-50);
  color: var(--orange-700);
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
}

/* ==================== SOFTWARE ==================== */
.software-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}
.software-card {
  background: var(--orange-10);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  border: 1px solid var(--orange-100);
  transition: all var(--transition-base);
}
.software-card:hover {
  border-color: var(--orange-300);
  box-shadow: var(--shadow-md);
}
.software-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.software-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.software-img-large {
  margin: calc(-1 * var(--space-xl));
  margin-bottom: var(--space-md);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  overflow: hidden;
}
.software-img-large img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.software-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--brown-900);
  margin-bottom: 4px;
}
.software-card .soft-subtitle {
  font-size: 14px;
  color: var(--orange-600);
  font-weight: 500;
  margin-bottom: 14px;
}
.software-card li {
  font-size: 14px;
  color: var(--brown-700);
  padding: 4px 0;
  line-height: 1.7;
}
.software-card li::before {
  content: "✓  ";
  color: var(--orange-500);
  font-weight: bold;
}

/* ==================== SOLUTIONS ==================== */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}
.solution-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}
.solution-card.featured {
  border: 2px solid var(--orange-400);
}
.solution-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.solution-img {
  width: 100%;
  height: 200px;
  overflow: hidden;
}
.solution-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.solution-card:hover .solution-img img {
  transform: scale(1.05);
}
.solution-content {
  padding: var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}
.solution-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--brown-900);
  margin-bottom: var(--space-sm);
}
.solution-card p {
  font-size: 14px;
  color: var(--brown-700);
  line-height: 1.7;
  margin-bottom: var(--space-md);
  flex: 1;
}
.solution-tag {
  display: inline-block;
  padding: 6px 14px;
  background: var(--orange-50);
  color: var(--orange-700);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  width: fit-content;
}

/* ==================== NEWS ==================== */
.news-grid {
  column-count: 3;
  column-gap: var(--space-lg);
}
.news-card {
  display: inline-block;
  width: 100%;
  margin-bottom: var(--space-lg);
  break-inside: avoid;
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}
.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.news-card-image {
  display: none;
}
.news-card-body {
  padding: var(--space-lg);
}
.news-card-date {
  font-size: 13px;
  color: var(--brown-400);
  margin-bottom: 8px;
}
.news-card h2, .news-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--brown-900);
  margin-bottom: var(--space-sm);
  line-height: 1.3;
}
.news-card p {
  font-size: 13px;
  color: var(--brown-500);
  line-height: 1.7;
}
.news-read-more {
  display: inline-block;
  margin-top: var(--space-md);
  font-size: 13px;
  font-weight: 600;
  color: var(--orange-700);
  transition: color var(--transition-fast);
}
.news-read-more:hover {
  color: var(--orange-900);
}
.news-read-more::after {
  content: " →";
}

/* ==================== 新闻详情页 ==================== */
.news-detail {
  padding-top: calc(var(--header-height) + 60px);
  padding-bottom: var(--space-4xl);
  min-height: 80vh;
}
.news-detail-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}
.news-detail-header .date {
  font-size: 14px;
  color: var(--brown-300);
  margin-bottom: var(--space-md);
}
.news-detail-header h1 {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 800;
  color: var(--brown-900);
  line-height: 1.3;
  max-width: 800px;
  margin: 0 auto;
}
.news-detail-body {
  max-width: 780px;
  margin: 0 auto;
  font-size: 16px;
  line-height: 2;
  color: var(--brown-700);
}
.news-detail-body p {
  margin-bottom: var(--space-lg);
}
.news-detail-body strong {
  color: var(--brown-900);
}
.news-detail-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: var(--space-2xl);
  padding: 10px 20px;
  background: var(--white);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--orange-700);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}
.news-detail-back:hover {
  box-shadow: var(--shadow-md);
  color: var(--orange-800);
}

/* ==================== TIMELINE (发展历程) ==================== */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding-left: 40px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--orange-500), var(--orange-200));
}
.timeline-item {
  position: relative;
  margin-bottom: var(--space-xl);
  padding-left: var(--space-lg);
}
.timeline-item::before {
  content: "";
  position: absolute;
  left: -40px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--orange-700);
  border: 3px solid var(--white);
  box-shadow: 0 0 0 3px var(--orange-300);
}
.timeline-year {
  font-size: 13px;
  font-weight: 700;
  color: var(--orange-600);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
}
.timeline-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--brown-900);
  margin-bottom: 6px;
}
.timeline-desc {
  font-size: 14px;
  color: var(--brown-500);
  line-height: 1.7;
}

/* ==================== CERTIFICATIONS ==================== */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}
.cert-card {
  background: var(--white);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border-top: 3px solid var(--orange-400);
  transition: transform var(--transition-fast);
}
.cert-card:hover {
  transform: translateY(-2px);
}
.cert-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cert-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.cert-card h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--brown-800);
}

/* ==================== SELECTION TABLE ==================== */
.table-responsive {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  -webkit-overflow-scrolling: touch;
}
.selection-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 700px;
}
.selection-table thead {
  background: var(--orange-700);
}
.selection-table th {
  padding: 16px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--white);
  text-align: left;
}
.selection-table td {
  padding: 14px 20px;
  font-size: 14px;
  color: var(--brown-700);
  border-bottom: 1px solid var(--orange-50);
}
.selection-table tr:nth-child(even) td { background: var(--orange-25); }
.selection-table tr:nth-child(odd) td { background: var(--white); }
.selection-table tr:hover td { background: var(--orange-50); }

/* 性能指标表 */
.perf-table {
  width: 100%;
  border-collapse: collapse;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.perf-table thead {
  background: var(--orange-700);
}
.perf-table th {
  padding: 14px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--white);
  text-align: left;
}
.perf-table td {
  padding: 12px 20px;
  font-size: 14px;
  color: var(--brown-700);
  border-bottom: 1px solid var(--orange-50);
}
.perf-table tr:nth-child(even) td { background: var(--orange-25); }
.perf-table tr:nth-child(odd) td { background: var(--white); }

/* ==================== CONTACT ==================== */
.contact-grid {
  max-width: 800px;
  margin: var(--space-xl) auto 0;
}
.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}
.contact-info-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}
.contact-info-item {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}
.contact-icon-box {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.12);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.contact-icon-box img {
  width: 28px;
  height: 28px;
  object-fit: contain;
}

/* Platform icon (English single page) */
.platform-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.platform-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.contact-info-item h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}
.contact-info-item p {
  font-size: 14px;
  opacity: 0.85;
  line-height: 1.7;
}

/* ==================== BREADCRUMB ==================== */
.breadcrumb {
  display: none;
}
.breadcrumb .container {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--brown-300);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--orange-50);
  margin-bottom: 24px;
}
.breadcrumb a {
  color: var(--orange-600);
  transition: color var(--transition-fast);
}
.breadcrumb a:hover {
  color: var(--orange-800);
}
.breadcrumb .sep {
  color: var(--gray-300);
}

/* ==================== PAGE BANNER ==================== */
.page-banner {
  display: none;
}

/* ==================== FOOTER ==================== */
.footer {
  background: var(--navy-900);
  color: var(--orange-100);
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand p {
  font-size: 14px;
  opacity: 0.7;
  margin-top: 12px;
  line-height: 1.7;
}
.footer-logo-img {
  height: 32px;
  width: auto;
  margin-bottom: 8px;
}
.footer-links h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--white);
}
.footer-links a {
  display: block;
  font-size: 14px;
  opacity: 0.7;
  padding: 4px 0;
  transition: opacity var(--transition-fast), color var(--transition-fast);
}
.footer-links a:hover {
  opacity: 1;
  color: var(--orange-300);
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  opacity: 0.5;
}

/* ==================== BACK TO TOP ==================== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--orange-700);
  color: var(--white);
  border: none;
  cursor: pointer;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: 999;
  pointer-events: none;
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.back-to-top:hover {
  background: var(--orange-800);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ==================== ANIMATIONS (JS触发) ==================== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==================== 无障碍: prefers-reduced-motion ==================== */
@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;
  }
}

/* ==================== RESPONSIVE ==================== */
/* 桌面大屏 ≥1280px — 使用默认样式 */

/* 平板 1024-1279px */
@media (max-width: 1279px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .software-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { column-count: 2; }
  .culture-grid { grid-template-columns: repeat(3, 1fr); }
  .hero-title { font-size: clamp(28px, 5vw, 44px); }
}

/* 小平板 768-1023px */
@media (max-width: 1023px) {
  .about-grid { grid-template-columns: 1fr; }
  .solution-grid { grid-template-columns: 1fr; }
  .perf-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .software-grid { grid-template-columns: 1fr; }
  .culture-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { column-count: 2; }
}

/* 移动端 <768px */
@media (max-width: 767px) {
  /* 汉堡菜单 */
  .menu-toggle { display: flex; }
  .nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255,255,255,0.98);
    flex-direction: column;
    padding: var(--space-lg);
    overflow-y: auto;
    z-index: 999;
  }
  .nav.open { display: flex; }
  .nav-link { font-size: 16px; padding: 12px 16px; }

  /* 语言切换移动端适配 */
  .lang-switch {
    margin-left: auto;
    margin-right: 12px;
  }

  /* 布局适配 */
  .about-grid,
  .contact-grid { max-width: 100%; }
  .contact-info-row { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: 1fr; }
  .software-grid { grid-template-columns: 1fr; }
  .news-grid { column-count: 1; }
  .culture-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }

  /* Hero 移动端 */
  .hero { min-height: auto; padding: var(--header-height) 0 60px; }
  .hero-content { padding: 60px var(--space-md); }
  .hero-stats { gap: 20px; }
  .stat-num { font-size: 24px; }
  .hero-btns { flex-direction: column; align-items: center; }
  .hero-btns .btn { width: 100%; max-width: 280px; }

  /* 通用 */
  .section { padding: 50px 0; }
  .section-title { font-size: 24px; }
  .container { padding: 0 var(--space-md); }

  /* 面包屑 */
  .breadcrumb .container { font-size: 12px; }
}

/* 最小屏 <480px */
@media (max-width: 479px) {
  .hero-circle { display: none; }
  .hero-title { font-size: 26px; }
  .hero-desc { font-size: 14px; }
  .product-img { height: 120px; }
  .solution-img { height: 150px; }
}