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

:root {
  --titanium: #8A9099;
  --titanium-dark: #003366;
  --titanium-light: #C0C0C0;
  --accent: #003366;
  --accent-hover: #002244;
  --accent-light: #E6EEF5;
  --bg: #FAFAFA;
  --bg-white: #FFFFFF;
  --bg-dark: #1A1F26;
  --text-primary: #1A1F26;
  --text-secondary: #5A6270;
  --text-muted: #8B95A2;
  --border: #E8ECF0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.08);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --header-h: 64px;
}

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

body {
  font-family: 'Noto Sans SC', 'Inter', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden; /* 修复横滑 */
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; font-family: inherit; }
ul { list-style: none; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== HEADER ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-sm);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--titanium-dark);
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #003366 0%, #004488 100%);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 900;
  font-size: 14px;
  letter-spacing: -1px;
}

.nav { display: flex; align-items: center; gap: 2px; }

.nav a {
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
}

.nav a:hover,
.nav a.active {
  color: var(--text-primary);
  background: rgba(0,0,0,0.03);
}

.nav a.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.nav-cta {
  margin-left: 12px;
  padding: 8px 20px !important;
  background: var(--accent) !important;
  color: white !important;
  border-radius: var(--radius-sm) !important;
  font-weight: 600 !important;
  transition: var(--transition);
}

.nav-cta:hover {
  background: var(--accent-hover) !important;
  transform: translateY(-1px);
}

.mobile-toggle {
  display: none;
  width: 40px;
  height: 40px;
  background: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.mobile-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: var(--transition);
}

/* ========== HERO ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(160deg, #F5F7FA 0%, #FFFFFF 40%, #F0F2F5 100%);
  padding-top: var(--header-h);
}

.hero::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 60%;
  height: 120%;
  background: radial-gradient(ellipse, rgba(139,149,162,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(to top, var(--bg), transparent);
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px 6px 8px;
  background: var(--accent-light);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 24px;
  border: 1px solid rgba(0,51,102,0.12);
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

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

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--titanium-dark);
  margin-bottom: 20px;
}

.hero h1 span {
  background: linear-gradient(135deg, var(--accent), #0055A5);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--accent);
  color: white;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(0,51,102,0.25);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0,51,102,0.3);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--bg-white);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.btn-secondary:hover {
  border-color: var(--titanium-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.hero-stat-num {
  font-size: 2rem;
  font-weight: 900;
  color: var(--titanium-dark);
  line-height: 1;
  letter-spacing: -0.02em;
}

.hero-stat-num span { color: var(--accent); }

.hero-stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-card {
  width: 100%;
  max-width: 480px;
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, #C0C0C0 0%, #A8AEB5 50%, #8A9099 100%);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.hero-card-inner {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 32px;
  background: linear-gradient(to top, rgba(26,31,38,0.7), transparent 60%);
}

.hero-card-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.6);
  margin-bottom: 8px;
}

.hero-card-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  letter-spacing: -0.02em;
}

.hero-card-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  padding: 6px 12px;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(10px);
  border-radius: 100px;
  font-size: 0.7rem;
  color: white;
  font-weight: 500;
}

.hero-float-card {
  position: absolute;
  background: white;
  border-radius: var(--radius-md);
  padding: 16px 20px;
  box-shadow: var(--shadow-lg);
  animation: float 6s ease-in-out infinite;
}

.hero-float-card:nth-child(2) {
  top: 10%;
  left: -40px;
  animation-delay: -2s;
}

.hero-float-card:nth-child(3) {
  bottom: 20%;
  right: -30px;
  animation-delay: -4s;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.float-card-icon {
  width: 32px;
  height: 32px;
  background: var(--accent-light);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 8px;
  font-size: 16px;
}

.float-card-text {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
}

.float-card-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* ========== SECTIONS COMMON ========== */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--titanium-dark);
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* ========== HISTORY TIMELINE ========== */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: 48px;
  position: relative;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.timeline-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.timeline-item:nth-child(odd) {
  flex-direction: row;
}

.timeline-item:nth-child(even) {
  flex-direction: row-reverse;
}

.timeline-dot {
  position: absolute;
  left: 50%;
  top: 8px;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border: 3px solid var(--bg-white);
  border-radius: 50%;
  transform: translateX(-50%);
  box-shadow: 0 0 0 4px rgba(0,51,102,0.15);
  z-index: 1;
}

.timeline-content {
  width: calc(50% - 40px);
  background: var(--bg);
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.timeline-content:hover {
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.timeline-year {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
}

.timeline-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--titanium-dark);
  margin-bottom: 8px;
}

.timeline-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========== PRODUCTS ========== */
.product-cats {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.product-cat {
  padding: 10px 24px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.product-cat:hover {
  border-color: var(--titanium-light);
  color: var(--text-primary);
}

.product-cat.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
  font-weight: 600;
}

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

.product-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}

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

.product-card.hidden { display: none; }

.product-img {
  width: 100%;
  aspect-ratio: 16/10;
  position: relative;
  overflow: hidden;
}

.product-img-bg {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.product-bottle {
  width: 56px;
  height: 80px;
  background: linear-gradient(180deg, rgba(255,255,255,0.25), rgba(255,255,255,0.08));
  border-radius: 8px 8px 4px 4px;
  border: 1px solid rgba(255,255,255,0.15);
  position: relative;
}

.product-bottle::before {
  content: '';
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 12px;
  background: rgba(255,255,255,0.2);
  border-radius: 3px 3px 0 0;
}

.product-bottle::after {
  content: attr(data-model);
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.55rem;
  color: rgba(255,255,255,0.5);
  white-space: nowrap;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.product-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 10px;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(8px);
  border-radius: 100px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
}

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

.product-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--titanium-dark);
  margin-bottom: 6px;
}

.product-model {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 10px;
  font-family: 'Inter', monospace;
  letter-spacing: 0.03em;
}

.product-desc {
  font-size: 0.825rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.product-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.product-spec {
  padding: 4px 10px;
  background: var(--bg);
  border-radius: 100px;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ========== HOT PRODUCTS ========== */
.hot-products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.hot-product-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}

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

.hot-product-card .product-img {
  aspect-ratio: 16/10;
}

.hot-product-card .product-body {
  padding: 16px 20px 20px;
}

.hot-product-card .product-name {
  font-size: 0.95rem;
}

.hot-product-card .product-desc {
  font-size: 0.775rem;
  -webkit-line-clamp: 2;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.hot-products-more {
  text-align: center;
  margin-top: 40px;
}

.hot-products-more a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 32px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
  transition: var(--transition);
}

.hot-products-more a:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ========== NEWS ========== */
.news-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.news-featured {
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  cursor: pointer;
  aspect-ratio: 4/3;
  transition: var(--transition);
}

.news-featured:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }

.news-featured-bg {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  position: relative;
}

.news-featured-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(26,31,38,0.85) 0%, rgba(26,31,38,0.2) 50%, transparent 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 28px;
}

.news-featured-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--accent);
  border-radius: 100px;
  font-size: 0.7rem;
  font-weight: 600;
  color: white;
  width: fit-content;
  margin-bottom: 12px;
}

.news-featured-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: white;
  margin-bottom: 8px;
  line-height: 1.4;
}

.news-featured-excerpt {
  font-size: 0.825rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.news-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}

.news-tab {
  padding: 10px 20px;
  font-size: 0.825rem;
  font-weight: 500;
  color: var(--text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
}

.news-tab:hover { color: var(--text-primary); }

.news-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

.news-items {
  display: flex;
  flex-direction: column;
}

.news-item {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: var(--transition);
}

.news-item:last-child { border-bottom: none; }

.news-item:hover .news-item-title { color: var(--accent); }

.news-item-date {
  flex-shrink: 0;
  width: 52px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.news-item-day {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--titanium-dark);
  line-height: 1;
}

.news-item-month {
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-top: 2px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.news-item-body {
  flex: 1;
  min-width: 0;
}

.news-item-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 100px;
  font-size: 0.65rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.news-item-tag.company { background: #EDE9FE; color: #7C3AED; }
.news-item-tag.product { background: #DBEAFE; color: #2563EB; }
.news-item-tag.industry { background: #D1FAE5; color: #059669; }
.news-item-tag.event { background: var(--accent-light); color: var(--accent); }

.news-item-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
  transition: var(--transition);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.news-item-excerpt {
  font-size: 0.775rem;
  color: var(--text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-more {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 24px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  cursor: pointer;
  transition: var(--transition);
}

.news-more:hover { gap: 10px; }

/* ========== SMART SELECTOR ========== */
.selector-wrapper {
  max-width: 720px;
  margin: 0 auto;
}

.selector-progress {
  display: flex;
  gap: 8px;
  margin-bottom: 40px;
}

.selector-progress-step {
  flex: 1;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  transition: var(--transition);
}

.selector-progress-step.active {
  background: var(--accent);
}

.selector-progress-step.done {
  background: var(--titanium);
}

.selector-question {
  text-align: center;
  margin-bottom: 32px;
}

.selector-question h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--titanium-dark);
  margin-bottom: 8px;
}

.selector-question p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.selector-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 32px;
}

.selector-option {
  padding: 20px;
  background: var(--bg);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.selector-option:hover {
  border-color: var(--titanium-light);
  background: var(--bg-white);
}

.selector-option.selected {
  border-color: var(--accent);
  background: var(--accent-light);
}

.selector-option-icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.selector-option-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.selector-option-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.selector-nav {
  display: flex;
  justify-content: space-between;
}

.selector-btn {
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
}

.selector-btn-prev {
  background: var(--bg);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.selector-btn-prev:hover { background: var(--border); }

.selector-btn-next {
  background: var(--accent);
  color: white;
}

.selector-btn-next:hover { background: var(--accent-hover); }

.selector-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Result */
.selector-result {
  text-align: center;
  padding: 48px 32px;
  background: linear-gradient(135deg, var(--accent-light), #EFF4FA);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(0,51,102,0.15);
}

.selector-result-icon {
  font-size: 3rem;
  margin-bottom: 16px;
}

.selector-result h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--titanium-dark);
  margin-bottom: 8px;
}

.selector-result-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.8;
}

.selector-result-features {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 32px;
}

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

.result-feature-val {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--accent);
}

.result-feature-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.selector-restart {
  padding: 10px 24px;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  cursor: pointer;
}

.selector-restart:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ========== CONTACT ========== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.contact-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--border);
  text-align: center;
  transition: var(--transition);
}

.contact-card:hover {
  box-shadow: var(--shadow-md);
  border-color: transparent;
  transform: translateY(-2px);
}

.contact-card-icon {
  width: 56px;
  height: 56px;
  background: var(--accent-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.5rem;
}

.contact-card-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--titanium-dark);
  margin-bottom: 8px;
}

.contact-card-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.contact-card-text a {
  color: var(--accent);
  font-weight: 500;
}

.contact-map {
  width: 100%;
  min-height: 450px;
  background: linear-gradient(135deg, #E6EEF5, #C0C0C0);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 20px;
  position: relative;
  overflow: hidden;
}

.amap-container {
  width: 100%;
  height: 100%;
  min-height: 400px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  margin-top: 16px;
}

.map-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 400px;
  background: linear-gradient(135deg, #E6EEF5, #F5F7FA);
  border-radius: var(--radius-lg);
  font-size: 0.9rem;
  color: var(--text-muted);
  gap: 12px;
}

.contact-map-icon {
  font-size: 2.5rem;
  opacity: 0.5;
}

/* ========== PAGE HERO ========== */
.page-hero {
  padding-top: calc(var(--header-h) + 60px);
  padding-bottom: 60px;
  background: linear-gradient(160deg, #F5F7FA 0%, #FFFFFF 40%, #F0F2F5 100%);
  text-align: center;
}

.page-hero .section-tag {
  margin-bottom: 12px;
}

.page-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--titanium-dark);
  margin-bottom: 16px;
}

.page-hero p {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

.page-hero-breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 20px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.page-hero-breadcrumb a {
  color: var(--accent);
  font-weight: 500;
}

.page-hero-breadcrumb span {
  color: var(--border);
}

/* ========== FOOTER ========== */
.footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.5);
  padding: 48px 0 24px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 24px;
}

.footer-brand .logo { color: rgba(255,255,255,0.9); }
.footer-brand .logo-icon { background: linear-gradient(135deg, #004488, #003366); }

.footer-brand-desc {
  font-size: 0.8rem;
  margin-top: 8px;
  max-width: 280px;
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 48px;
}

.footer-col-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: rgba(255,255,255,0.7);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
  padding: 4px 0;
  transition: var(--transition);
}

.footer-col a:hover { color: rgba(255,255,255,0.8); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
}

/* ========== SCROLL ANIMATIONS ========== */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== PRODUCT MODAL (DESKTOP - GLOBAL) ========== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  background: var(--bg-white);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 780px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.2);
  transform: translateY(20px) scale(0.97);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.modal-overlay.open .modal-dialog {
  transform: translateY(0) scale(1);
}

.modal-header {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 28px 0;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--border);
  font-size: 1.1rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  cursor: pointer;
  z-index: 10;
}

.modal-close:hover {
  background: var(--border);
  color: var(--text-primary);
}

.modal-body {
  padding: 20px 28px 28px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

/* Left: product visual + basic info */
.modal-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/3;
  position: relative;
}

.modal-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.modal-visual .product-tag {
  top: 12px;
  left: 12px;
}

.modal-info {
  display: flex;
  flex-direction: column;
}

.modal-category {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 8px;
}

.modal-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--titanium-dark);
  line-height: 1.3;
  margin-bottom: 4px;
}

.modal-model {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: 'Inter', monospace;
  letter-spacing: 0.03em;
  margin-bottom: 12px;
}

.modal-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.modal-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

/* Params table */
.modal-params {
  margin-bottom: 20px;
}

.modal-section-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--titanium-dark);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.modal-param-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 0.825rem;
}

.modal-param-row:not(:last-child) {
  border-bottom: 1px solid var(--bg);
}

.modal-param-label {
  color: var(--text-muted);
}

.modal-param-value {
  font-weight: 600;
  color: var(--text-primary);
}

/* Reports / downloads */
.modal-reports {
  margin-top: auto;
}

.report-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  text-decoration: none;
  color: var(--text-primary);
  transition: var(--transition);
  font-size: 0.85rem;
}

.report-link:hover {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent);
}

.report-icon {
  width: 32px;
  height: 32px;
  background: #FEE2E2;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 800;
  color: #DC2626;
  flex-shrink: 0;
  letter-spacing: -0.5px;
}

.report-name {
  flex: 1;
  font-weight: 500;
}

.report-download {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
}

.report-link:hover .report-download {
  color: var(--accent);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  .nav { display: none; }
  .mobile-toggle { display: flex; }

  .nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: white;
    padding: 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
  }

  .nav.open a { padding: 12px 16px; }
  .nav.open .nav-cta { margin: 8px 0 0; text-align: center; }

  .hero .container {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
    padding-top: 60px;
    padding-bottom: 60px;
  }

  .hero-desc { margin: 0 auto 36px; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-visual { display: none; }

  /* 修复浮动卡片溢出 */
  .hero-float-card:nth-child(2) { left: 10px !important; }
  .hero-float-card:nth-child(3) { right: 10px !important; }
  .hero::before { right: 0 !important; }

  .timeline::before { left: 20px; }
  .timeline-item,
  .timeline-item:nth-child(even) {
    flex-direction: row;
    padding-left: 48px;
  }
  .timeline-dot { left: 20px; }
  .timeline-content { width: 100%; }

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

  .hot-products-grid {
    grid-template-columns: 1fr; /* 一行一个 */
  }

  .selector-options {
    grid-template-columns: 1fr;
  }

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

  .footer-top {
    flex-direction: column;
    gap: 32px;
  }

  .footer-links { flex-direction: column; gap: 24px; }

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

  .news-layout {
    grid-template-columns: 1fr;
  }

  /* ========== PRODUCT MODAL - MOBILE OPTIMIZED ========== */
  .modal-overlay {
    padding: 0;
    align-items: flex-end; /* 底部弹出 */
  }

  .modal-dialog {
    width: 100%;
    max-width: 100%;
    max-height: 92vh;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    transform: translateY(100%); /* 初始在屏幕外 */
    margin: 0;
  }

  .modal-overlay.open .modal-dialog {
    transform: translateY(0); /* 滑入 */
  }

  .modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    background: rgba(255,255,255,0.9);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  }

  /* 使用 display: contents 重排 DOM 顺序 */
  .modal-body {
    display: flex;
    flex-direction: column;
    padding: 0;
    gap: 0;
  }

  .modal-body > div:first-child {
    display: contents; /* 解除左侧容器包裹 */
  }

  .modal-info {
    display: contents; /* 解除右侧容器包裹 */
  }

  /* 重新定义移动端显示顺序 */
  .modal-visual { order: 1; width: 100%; aspect-ratio: 16/9; border-radius: 0; }
  .modal-category { order: 2; padding: 16px 16px 0; margin-bottom: 4px; }
  .modal-title { order: 3; padding: 0 16px; font-size: 1.2rem; margin-bottom: 4px; }
  .modal-model { order: 4; padding: 0 16px; margin-bottom: 12px; }
  .modal-desc { order: 5; padding: 0 16px; margin-bottom: 0; }
  .modal-specs { order: 6; padding: 0 16px; margin-top: 12px; margin-bottom: 0; }
  .modal-params { order: 7; padding: 16px; border-top: 1px solid var(--border); margin-top: 16px; margin-bottom: 0; }
  .modal-reports { order: 8; padding: 16px; border-top: 1px solid var(--border); margin-top: 0; }
}

/* 二维码样式 */
.qrcode-container {
  width: 140px;
  height: 140px;
  margin: 8px auto 12px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.qrcode-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.qrcode-tip {
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-top: 4px;
  text-align: center;
}

/* 移动端适配 */
@media (max-width: 768px) {
  .qrcode-container {
    width: 120px;
    height: 120px;
  }
}