/* ===== WEBON PVC-O Export Website - Premium UI v2 ===== */

/* --- Design System Variables --- */
:root {
  /* Primary: Navy blue palette for industrial trust */
  --primary: #003F7D;
  --primary-dark: #002D5C;
  --primary-light: #1A5C9E;
  --primary-tint: #E6F0FA;
  /* Accent: Single restrained teal for CTAs */
  --accent: #0E7C6B;
  --accent-dark: #096053;
  --accent-light: #E0F0ED;
  /* Neutrals */
  --ink: #001A33;
  --gray-900: #1F2937;
  --gray-700: #374151;
  --gray-500: #6B7280;
  --gray-400: #9CA3AF;
  --gray-300: #D1D5DB;
  --gray-200: #E5E7EB;
  --gray-100: #F3F4F6;
  --gray-50: #F9FAFB;
  --gray-25: #FCFCFD;
  --white: #ffffff;
  /* Status */
  --green: #059669;
  /* Lines & surfaces */
  --border: #E5E7EB;
  --border-light: #F0F1F3;
  /* Radius */
  --r-sm: 4px;
  --r: 6px;
  --r-md: 8px;
  --r-lg: 12px;
  --r-xl: 16px;
  /* Shadows — subtle, layered */
  --shadow-xs: 0 1px 2px rgba(16,24,40,0.04);
  --shadow-sm: 0 1px 3px rgba(16,24,40,0.06), 0 1px 2px rgba(16,24,40,0.04);
  --shadow: 0 2px 8px rgba(16,24,40,0.06), 0 1px 3px rgba(16,24,40,0.04);
  --shadow-md: 0 4px 16px rgba(16,24,40,0.08), 0 2px 6px rgba(16,24,40,0.04);
  --shadow-lg: 0 12px 32px rgba(16,24,40,0.10), 0 4px 12px rgba(16,24,40,0.06);
  /* Layout */
  --max-width: 1200px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  /* Typography */
  --font-sans: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

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

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

body {
  font-family: var(--font-sans);
  line-height: 1.65;
  color: var(--gray-900);
  background: var(--white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

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

a:hover {
  color: var(--primary-dark);
}

ul {
  list-style: none;
}

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

/* --- Header / Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  transition: all var(--transition);
}

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

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  padding: 0 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

/* --- Logo --- */
.logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary-dark);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

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

.nav-menu li {
  position: relative;
}

.nav-menu a {
  display: block;
  padding: 8px 14px;
  color: var(--gray-700);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--r-sm);
  transition: all var(--transition);
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--primary);
  background: var(--primary-tint);
  font-weight: 600;
}

.nav-menu a:hover {
  transform: translateY(-1px);
}

.nav-menu .has-dropdown > a::after {
  content: '\25BE';
  margin-left: 4px;
  font-size: 0.7rem;
  color: var(--gray-400);
}

.dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  min-width: 220px;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-md);
  padding: 6px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: all var(--transition);
}

.nav-menu li:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown a {
  padding: 8px 14px;
  font-size: 0.88rem;
  border-radius: var(--r-sm);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px !important;
  background: var(--accent) !important;
  color: white !important;
  border-radius: var(--r-sm);
  font-weight: 600;
  font-size: 0.88rem;
  transition: all var(--transition);
}

.nav-cta:hover {
  background: var(--accent-dark) !important;
  color: white !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(14,124,107,0.35);
}

/* --- Mobile Hamburger --- */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.hamburger span {
  width: 22px;
  height: 2px;
  background: var(--gray-700);
  transition: all var(--transition);
  border-radius: 1px;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
}
.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  border-radius: var(--r-sm);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  text-decoration: none;
  letter-spacing: 0.01em;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-dark);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,63,125,0.30);
}

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

.btn-accent:hover {
  background: var(--accent-dark);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(14,124,107,0.30);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--gray-300);
}

.btn-outline:hover {
  border-color: var(--primary);
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,63,125,0.20);
}

.btn-ghost-light {
  background: transparent;
  color: white;
  border: 1px solid rgba(255,255,255,0.3);
}

.btn-ghost-light:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.7);
  color: white;
  transform: translateY(-2px);
}

/* Solid white button for dark backgrounds */
.btn-light-solid {
  background: white;
  color: var(--primary-dark);
  border: 1px solid white;
}

.btn-light-solid:hover {
  background: var(--gray-100);
  border-color: var(--gray-200);
  color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

/* Hero-specific button sizing & weight */
.hero-buttons .btn {
  padding: 13px 32px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 14px rgba(0,0,0,0.15);
}

.hero-buttons .btn-accent {
  box-shadow: 0 4px 18px rgba(14,124,107,0.40);
}

.hero-buttons .btn-accent:hover {
  box-shadow: 0 8px 28px rgba(14,124,107,0.50);
}

.hero-buttons .btn-light-solid:hover {
  box-shadow: 0 6px 24px rgba(0,0,0,0.20);
}

.btn-lg {
  padding: 13px 32px;
  font-size: 1rem;
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 680px;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  background: linear-gradient(135deg, #0B72E0 0%, #2A8AEE 50%, #0B72E0 100%);
  color: white;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse 70% 50% at 70% 45%, rgba(255,255,255,0.20) 0%, transparent 55%),
    linear-gradient(180deg, #0B72E0 0%, #2A8AEE 100%);
}

.hero-bg-grid {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
  flex: 0 1 760px;
  transform: translateX(-20%);
}

/* --- Hero Image with Gradient Mask --- */
.hero-image-wrap {
  position: absolute;
  top: 0;
  right: 0;
  width: 55%;
  height: 100%;
  z-index: 1;
  overflow: hidden;
}

.hero-product-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-image-mask {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    to right,
    #0B72E0 0%,
    rgba(11,114,224,0.85) 8%,
    rgba(11,114,224,0.68) 20%,
    rgba(11,114,224,0.48) 38%,
    rgba(11,114,224,0.30) 55%,
    rgba(11,114,224,0.16) 72%,
    rgba(11,114,224,0.06) 88%,
    rgba(11,114,224,0.02) 96%,
    rgba(11,114,224,0) 100%
  );
}

.hero-image-mask::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    180deg,
    rgba(11,114,224,0.55) 0%,
    rgba(11,114,224,0.10) 18%,
    transparent 30%,
    transparent 70%,
    rgba(11,114,224,0.10) 82%,
    rgba(11,114,224,0.40) 100%
  );
}

.hero-badge {
  display: inline-block;
  padding: 5px 14px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 30px;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 24px;
  font-weight: 500;
  letter-spacing: 0.03em;
}

.hero h1 {
  font-size: 2.75rem;
  line-height: 1.2;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero h1 .highlight {
  color: #fff;
  text-shadow: 0 2px 14px rgba(0,45,92,0.25);
}

.hero-subtitle {
  font-size: 1.08rem;
  color: rgba(255,255,255,0.72);
  margin-bottom: 36px;
  line-height: 1.65;
  max-width: 620px;
}

.hero-buttons {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-image {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 44%;
  max-width: 500px;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-right: 24px;
}

.hero-image::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(11,114,224,0.28) 0%, transparent 40%, transparent 70%, rgba(11,114,224,0.18) 100%);
  border-radius: var(--r-lg);
  pointer-events: none;
  z-index: 2;
}

.hero-image-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--r-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.hero-image-placeholder svg {
  width: 60%;
  height: 60%;
  opacity: 0.7;
}

/* Real hero image */
.hero-img {
  width: 100%;
  height: auto;
  max-height: 500px;
  object-fit: cover;
  border-radius: var(--r-lg);
  box-shadow: 0 16px 48px rgba(0,0,0,0.35);
  display: block;
  position: relative;
  z-index: 1;
}

/* --- Stats Section --- */
.stats {
  padding: 48px 0;
  background: var(--gray-50);
  border-bottom: 1px solid var(--border-light);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  padding: 16px;
  position: relative;
}

.stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -12px;
  top: 25%;
  bottom: 25%;
  width: 1px;
  background: var(--border);
}

.stat-number {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--gray-500);
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* --- Section Common --- */
.section {
  padding: 72px 0;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 48px;
}

.section-title {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 14px;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--gray-500);
  line-height: 1.65;
}

/* --- Solutions Section --- */
.solutions {
  background: var(--white);
}

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

.solution-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 36px 32px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.solution-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.solution-card:hover {
  box-shadow: 0 8px 28px rgba(16,24,40,0.12), 0 4px 12px rgba(16,24,40,0.06);
  transform: translateY(-4px);
  border-color: var(--primary-light);
}

.solution-card:hover::before {
  transform: scaleX(1);
}

.solution-card:hover .solution-icon {
  transform: scale(1.08);
}

.solution-card:hover h3 {
  color: var(--primary);
}

.solution-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--r-sm);
  background: var(--primary-tint);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 24px;
  transition: all var(--transition);
}

.solution-icon.green {
  background: var(--accent-light);
  color: var(--accent);
}

.solution-icon.orange {
  background: #FEF3E2;
  color: #B45309;
}

.solution-image {
  margin: -36px -32px 24px;
  border-radius: var(--r-lg) var(--r-lg) 0 0;
  overflow: hidden;
  background: var(--gray-100);
}

.solution-image img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.solution-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--ink);
  letter-spacing: -0.01em;
  transition: color var(--transition);
}

.solution-card .subtitle {
  font-size: 0.88rem;
  color: var(--gray-500);
  margin-bottom: 20px;
  line-height: 1.5;
}

.solution-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

.solution-tag {
  padding: 3px 10px;
  background: var(--gray-100);
  border-radius: var(--r-sm);
  font-size: 0.78rem;
  color: var(--gray-700);
  font-weight: 500;
}

.solution-card p {
  color: var(--gray-700);
  margin-bottom: 24px;
  line-height: 1.6;
  font-size: 0.92rem;
  flex: 1;
}

/* --- Technology Principle Section --- */
.tech-principle {
  background: var(--gray-50);
}

.tech-flow {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 40px;
}

.tech-step {
  text-align: center;
  flex: 1;
  min-width: 180px;
  max-width: 220px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.tech-step-circle {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: white;
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  position: relative;
  transition: all var(--transition);
}

.tech-step:hover .tech-step-circle {
  border-color: var(--primary);
  background: var(--primary);
  color: white;
  box-shadow: 0 6px 20px rgba(0,63,125,0.25);
  transform: scale(1.08);
}

.tech-step:hover h4 {
  color: var(--primary);
}

.tech-step-circle::after {
  content: '';
  position: absolute;
  top: 50%;
  right: -32px;
  width: 32px;
  height: 1px;
  background: var(--gray-300);
}

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

.tech-step h4 {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
  transition: color var(--transition);
}

.tech-step p {
  font-size: 0.83rem;
  color: var(--gray-500);
}

/* --- Comparison Table --- */
.comparison-table-wrap {
  overflow-x: auto;
  border-radius: var(--r-lg);
  box-shadow: 0 2px 12px rgba(16,24,40,0.06), 0 1px 4px rgba(16,24,40,0.04);
  border: 1px solid var(--border);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  background: white;
  min-width: 720px;
}

.comparison-table thead {
  background: var(--primary);
}

.comparison-table thead th {
  color: white;
  font-weight: 700;
  padding: 16px 14px;
  text-align: left;
  letter-spacing: -0.01em;
  font-size: 0.9rem;
  border-bottom: 2px solid var(--primary-dark);
}

.comparison-table thead th.col-pvco {
  background: var(--accent);
  color: white;
}

.comparison-table thead th.col-indicator {
  width: 38%;
}

.comparison-table tbody tr {
  border-bottom: 1px solid var(--border-light);
  transition: background var(--transition);
}

.comparison-table tbody tr:hover {
  background: var(--gray-50);
}

.comparison-table td {
  padding: 12px 14px;
  color: var(--gray-700);
  vertical-align: middle;
}

.comparison-table td:first-child {
  color: var(--ink);
  font-weight: 500;
  font-size: 0.86rem;
}

.comparison-table td.best {
  font-weight: 700;
  color: var(--accent-dark);
  background: var(--accent-light);
}

.comparison-table tr.group-row {
  background: var(--primary-tint);
}

.comparison-table tr.group-row td {
  font-weight: 700;
  font-size: 0.82rem;
  color: var(--primary-dark);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 10px 14px;
  border-bottom: 2px solid var(--primary-light);
}

.comparison-note {
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--gray-500);
  text-align: center;
  line-height: 1.5;
}

/* --- Why Choose Us --- */
.why-choose {
  background: var(--primary-dark);
  color: white;
}

.why-choose .section-title {
  color: white;
}

.why-choose .section-subtitle {
  color: rgba(255,255,255,0.6);
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  text-align: center;
}

.why-item {
  padding: 28px 16px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--r-md);
  transition: all var(--transition);
}

.why-item:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.25);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.20);
}

.why-item:hover .icon {
  transform: scale(1.12);
}

.why-item:hover h4 {
  color: white;
}

.why-item .icon {
  margin-bottom: 14px;
  display: flex;
  justify-content: center;
  transition: transform var(--transition);
}

.why-item h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  letter-spacing: 0.01em;
  transition: color var(--transition);
}

/* --- Case Study / Testimonials --- */
.case-study {
  background: var(--white);
}

.testimonial-card {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  padding: 48px 40px;
  background: var(--gray-50);
  border: 1px solid var(--border-light);
  border-radius: var(--r-lg);
  position: relative;
}

.testimonial-quote {
  font-size: 3.5rem;
  color: var(--primary);
  opacity: 0.12;
  line-height: 1;
  margin-bottom: 8px;
  font-family: Georgia, serif;
}

.testimonial-text {
  font-size: 1.05rem;
  color: var(--gray-700);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: italic;
}

.testimonial-author {
  font-weight: 700;
  color: var(--ink);
  font-size: 0.95rem;
}

.testimonial-role {
  font-size: 0.85rem;
  color: var(--gray-500);
  margin-top: 2px;
}

.case-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 32px;
}

.case-tag {
  padding: 5px 14px;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  font-size: 0.82rem;
  color: var(--gray-700);
  font-weight: 500;
  transition: all var(--transition);
}

.case-tag:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-tint);
}

/* --- FAQ Section --- */
.faq-section {
  background: var(--gray-50);
}

.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  max-width: 960px;
  margin: 0 auto;
}

.faq-category h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--primary);
  letter-spacing: -0.01em;
}

.faq-item {
  margin-bottom: 12px;
  background: white;
  border: 1px solid var(--border-light);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: all var(--transition);
}

.faq-item:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-sm);
}

.faq-item.open {
  box-shadow: 0 4px 16px rgba(16,24,40,0.08), 0 2px 6px rgba(16,24,40,0.04);
  border-color: var(--primary-light);
}

.faq-question {
  padding: 14px 18px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background var(--transition);
}

.faq-question:hover {
  background: var(--primary-tint);
  color: var(--primary);
}

.faq-question .toggle {
  color: var(--primary);
  font-size: 1.1rem;
  transition: transform var(--transition);
  flex-shrink: 0;
  margin-left: 8px;
}

.faq-item.open .faq-question .toggle {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 18px;
}

.faq-item.open .faq-answer {
  max-height: 200px;
  padding: 0 18px 14px;
}

.faq-answer p {
  font-size: 0.88rem;
  color: var(--gray-700);
  line-height: 1.6;
}

/* --- CTA Section --- */
.cta-section {
  padding: 56px 0;
  background: var(--primary);
  color: white;
  text-align: center;
}

.cta-section h2 {
  font-size: 1.85rem;
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.cta-section p {
  font-size: 1rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 28px;
}

/* --- Footer --- */
.footer {
  background: var(--ink);
  color: rgba(255,255,255,0.65);
  padding: 56px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 36px;
}

.footer-brand h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: white;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.footer-brand p {
  font-size: 0.86rem;
  line-height: 1.7;
  margin-bottom: 18px;
  color: rgba(255,255,255,0.5);
}

.footer-social {
  display: flex;
  gap: 10px;
}

.footer-social a,
.footer-social .footer-wechat {
  height: 34px;
  border-radius: var(--r-sm);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.5);
  font-size: 0.82rem;
  font-weight: 600;
  transition: all var(--transition);
}

.footer-social a { width: 34px; }

.footer-social a:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
  transform: translateY(-2px);
}

/* WeChat 联系方式胶囊（无外链，仅展示号码，基础样式与 WA/EM 徽章共用同一规则） */
.footer-social .footer-wechat {
  padding: 0 12px;
  white-space: nowrap;
  cursor: default;
}
.footer-social .footer-wechat:hover {
  color: white;
  background: rgba(255,255,255,0.12);
}

.footer-col h4 {
  font-size: 0.92rem;
  font-weight: 600;
  color: white;
  margin-bottom: 14px;
  letter-spacing: 0.01em;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col a {
  color: rgba(255,255,255,0.5);
  font-size: 0.86rem;
  transition: all var(--transition);
}

.footer-col a:hover {
  color: white;
  padding-left: 4px;
}

.footer-contact-item {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  margin-bottom: 10px;
  font-size: 0.86rem;
  color: rgba(255,255,255,0.5);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
}

.footer-bottom a {
  color: rgba(255,255,255,0.4);
}

/* --- Page Hero (for inner pages) --- */
.page-hero {
  padding: 120px 0 48px;
  background: var(--primary-dark);
  color: white;
  text-align: center;
}

.page-hero h1 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.page-hero p {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.65);
  max-width: 580px;
  margin: 0 auto;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 8px;
  font-size: 0.85rem;
  margin-top: 16px;
  color: rgba(255,255,255,0.4);
}

.breadcrumb a {
  color: rgba(255,255,255,0.6);
}

/* --- Product Detail Page --- */
.product-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 48px;
}

.product-image-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  border-radius: var(--r-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
  background: linear-gradient(135deg, #F8FAFE 0%, #EEF4FA 50%, #F8FAFE 100%);
  box-shadow: 0 4px 24px rgba(0,63,125,0.08), 0 1px 6px rgba(0,63,125,0.04);
}

.product-image-placeholder svg {
  width: 50%;
  height: 50%;
  opacity: 0.4;
}

.product-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}

.product-image-placeholder::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.25) 0%, transparent 30%, transparent 70%, rgba(230,240,250,0.15) 100%);
  pointer-events: none;
  z-index: 1;
}

.product-image-warm {
  background: linear-gradient(135deg, #F5F6F2 0%, #EAEDE6 50%, #F5F6F2 100%);
}

.product-image-warm::after {
  background: linear-gradient(135deg, rgba(245,246,242,0.35) 0%, transparent 25%, transparent 75%, rgba(234,237,230,0.25) 100%);
}

.product-image-warm::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  box-shadow: inset 0 0 60px rgba(245,246,242,0.3);
  pointer-events: none;
  z-index: 1;
  border-radius: var(--r-lg);
}

.product-info h2 {
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.product-info .product-desc {
  font-size: 0.98rem;
  color: var(--gray-700);
  margin-bottom: 24px;
  line-height: 1.7;
}

.product-features {
  margin-bottom: 28px;
}

.product-features li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 10px;
  font-size: 0.93rem;
  color: var(--gray-700);
}

.product-features li::before {
  content: '\2713';
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
}

/* --- Fittings Cards --- */
.fittings-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 36px;
}

.fitting-card {
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: #fff;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.fitting-card-img {
  width: 100%;
  height: 180px;
  object-fit: contain;
  object-position: center;
  display: block;
  background: #fff;
  padding: 16px;
  box-sizing: border-box;
}

.fitting-card:hover {
  border-color: var(--primary-light);
  box-shadow: 0 6px 28px rgba(0,63,125,0.10);
}

.fitting-card-header {
  padding: 24px 24px 0;
}

.fitting-card-header h4 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
}

.fitting-card-header p {
  font-size: 0.88rem;
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: 16px;
}

.fitting-card-body {
  padding: 0 24px 24px;
}

.fitting-spec-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.87rem;
}

.fitting-spec-row:last-child {
  border-bottom: none;
}

.fitting-spec-row .spec-label {
  color: var(--gray-600);
  font-weight: 500;
}

.fitting-spec-row .spec-value {
  color: var(--ink);
  font-weight: 600;
  text-align: right;
}

.fitting-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.fitting-tag {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 20px;
  background: var(--primary-tint);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 600;
}

.fitting-note {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 20px 24px;
  background: var(--primary-tint);
  border-radius: var(--r-md);
  margin-top: 8px;
}

.fitting-note svg {
  flex-shrink: 0;
  color: var(--primary);
}

.fitting-note p {
  font-size: 0.9rem;
  color: var(--gray-700);
  line-height: 1.7;
  margin: 0;
}

@media (max-width: 1024px) {
  .fittings-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .fittings-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

/* --- Advantage Cards (Horizontal) --- */
.advantages-grid {
  display: flex;
  gap: 24px;
  margin-bottom: 20px;
}

.advantage-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 28px 20px;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: #fff;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.advantage-item:hover {
  border-color: var(--primary-light);
  box-shadow: 0 6px 28px rgba(0,63,125,0.10);
}

.advantage-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary-tint);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--primary);
  flex-shrink: 0;
}

.advantage-item h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
}

.advantage-item p {
  font-size: 0.85rem;
  color: var(--gray-600);
  line-height: 1.6;
  margin: 0;
}

@media (max-width: 1024px) {
  .advantages-grid {
    flex-wrap: wrap;
  }
  .advantage-item {
    flex: 1 1 calc(50% - 12px);
  }
}

@media (max-width: 768px) {
  .advantages-grid {
    flex-direction: column;
    gap: 16px;
  }
  .advantage-item {
    flex: 1 1 100%;
  }
}

/* --- Spec Table --- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 30px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
}

.spec-table th,
.spec-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.88rem;
}

.spec-table th {
  background: var(--gray-50);
  font-weight: 600;
  color: var(--ink);
}

.spec-table tr {
  transition: background var(--transition);
}

.spec-table tbody tr:hover td {
  background: var(--primary-tint);
}

.spec-table tr:last-child td {
  border-bottom: none;
}

.spec-table tr:nth-child(even) td {
  background: var(--gray-25);
}

/* --- Application Cards --- */
.applications-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.application-card {
  padding: 28px 24px;
  background: var(--gray-50);
  border: 1px solid var(--border-light);
  border-radius: var(--r-md);
  text-align: center;
  transition: all var(--transition);
}

.application-card:hover {
  background: white;
  border-color: var(--primary-light);
  box-shadow: 0 6px 20px rgba(16,24,40,0.08), 0 2px 6px rgba(16,24,40,0.04);
  transform: translateY(-3px);
}

.application-card:hover .app-icon {
  background: var(--primary);
  color: white;
  transform: scale(1.1);
}

.application-card:hover h4 {
  color: var(--primary);
}

.application-card .app-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  border-radius: var(--r-sm);
  background: var(--primary-tint);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  transition: all var(--transition);
}

.application-card h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
  transition: color var(--transition);
}

.application-card p {
  font-size: 0.86rem;
  color: var(--gray-500);
  line-height: 1.55;
}

/* --- Blog Page --- */
.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.blog-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.blog-card > a {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  width: 100%;
  height: 100%;
  text-decoration: none;
  color: inherit;
}

.blog-card:hover {
  box-shadow: 0 8px 28px rgba(16,24,40,0.12), 0 4px 12px rgba(16,24,40,0.06);
  transform: translateY(-4px);
  border-color: var(--primary-light);
}

.blog-card:hover h3 {
  color: var(--primary);
}

.blog-card:hover .read-more {
  color: var(--accent);
}

.blog-card:hover .blog-card-image {
  filter: brightness(1.08);
}

.blog-card-image {
  width: 240px;
  flex-shrink: 0;
  aspect-ratio: auto;
  min-height: 180px;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.8rem;
  transition: filter var(--transition);
}

.blog-card-content {
  padding: 22px 26px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.blog-card-date {
  font-size: 0.78rem;
  color: var(--gray-400);
  margin-bottom: 8px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.blog-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  transition: color var(--transition);
}

.blog-card p {
  font-size: 0.88rem;
  color: var(--gray-500);
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
}

.blog-card .read-more {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 0.01em;
  transition: color var(--transition);
}

.blog-card .read-more:hover {
  color: var(--primary-dark);
}

/* --- Blog Article Document List --- */
.doc-list {
  list-style: none;
  padding: 0;
  margin: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.doc-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: #fff;
  transition: all var(--transition);
  text-decoration: none;
  color: inherit;
}

.doc-item:hover {
  border-color: var(--primary);
  background: var(--primary-light);
  box-shadow: 0 4px 14px rgba(0,63,125,0.08);
}

.doc-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.doc-info {
  flex: 1;
  min-width: 0;
}

.doc-name {
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
  word-break: break-word;
}

.doc-meta {
  font-size: 0.78rem;
  color: var(--gray-400);
  margin-top: 2px;
  letter-spacing: 0.02em;
}

.doc-type {
  display: inline-block;
  padding: 3px 10px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: 999px;
  background: var(--gray-100);
  color: var(--gray-600);
  flex-shrink: 0;
}

.doc-type.pdf {
  background: #fee2e2;
  color: #b91c1c;
}

.doc-type.sheets {
  background: #dcfce7;
  color: #166534;
}

.doc-type.doc {
  background: #dbeafe;
  color: #1e40af;
}

.doc-external {
  color: var(--gray-400);
  flex-shrink: 0;
  font-size: 1.1rem;
  line-height: 1;
}

.doc-item:hover .doc-external {
  color: var(--primary);
}

/* --- Blog Pagination --- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.pagination a,
.pagination span {
  min-width: 42px;
  height: 42px;
  padding: 0 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: #fff;
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
}

.pagination a:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.pagination .active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  cursor: default;
}

.pagination .disabled {
  color: var(--gray-300);
  background: var(--gray-50);
  cursor: not-allowed;
  opacity: 0.7;
}

.pagination .page-ellipsis {
  border: none;
  background: transparent;
  cursor: default;
  min-width: auto;
  padding: 0 4px;
}

/* --- Blog Article --- */
.blog-article {
  max-width: 780px;
  margin: 0 auto;
}

.blog-article-header {
  text-align: center;
  margin-bottom: 40px;
}

.blog-article-header h1,
.blog-article-header h2.article-title {
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 14px;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

/* article header heading demoted from h1 to h2 for single-h1 SEO structure */
.blog-article-header h2 {
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 14px;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.blog-meta {
  display: flex;
  justify-content: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--gray-400);
}

.blog-article-body {
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--gray-700);
}

.blog-article-body h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink);
  margin: 32px 0 16px;
  letter-spacing: -0.01em;
}

.blog-article-body h3 {
  font-size: 1.12rem;
  font-weight: 600;
  color: var(--ink);
  margin: 24px 0 12px;
}

.blog-article-body p {
  margin-bottom: 16px;
}

.blog-article-body ul {
  margin-bottom: 16px;
  padding-left: 24px;
}

.blog-article-body ul li {
  list-style: disc;
  margin-bottom: 8px;
}

.blog-article-body img {
  margin: 24px 0;
  border-radius: var(--r-lg);
}

/* --- Contact Page --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 40px;
}

.contact-info-card {
  background: var(--primary);
  color: white;
  padding: 40px;
  border-radius: var(--r-lg);
}

.contact-info-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

.contact-info-item {
  display: flex;
  gap: 14px;
  margin-bottom: 24px;
  align-items: flex-start;
}

.contact-info-item .icon {
  width: 36px;
  height: 36px;
  border-radius: var(--r-sm);
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-info-item .label {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.5);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.contact-info-item .value {
  font-size: 0.95rem;
  font-weight: 500;
}

.contact-form {
  background: var(--gray-50);
  padding: 40px;
  border: 1px solid var(--border-light);
  border-radius: var(--r-lg);
}

.contact-form h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

.form-group {
  margin-bottom: 22px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
  letter-spacing: 0.01em;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--gray-300);
  border-radius: var(--r-sm);
  font-size: 0.92rem;
  font-family: inherit;
  transition: all var(--transition);
  background: white;
  color: var(--gray-900);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0,63,125,0.08);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* --- Map Section --- */
.map-section {
  margin-top: 40px;
}

.map-placeholder {
  width: 100%;
  height: 320px;
  background: var(--gray-100);
  border: 1px solid var(--border-light);
  border-radius: var(--r-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

/* --- About Page --- */
.about-hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 48px;
}

.about-image-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--gray-100);
  border: 1px solid var(--border-light);
  border-radius: var(--r-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-text h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.about-text p {
  color: var(--gray-700);
  margin-bottom: 16px;
  line-height: 1.7;
}

.timeline {
  position: relative;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 32px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -34px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid white;
  box-shadow: 0 0 0 2px var(--primary);
}

.timeline-item .year {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 4px;
}

.timeline-item h4 {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}

.timeline-item p {
  font-size: 0.86rem;
  color: var(--gray-500);
  line-height: 1.55;
}

/* --- Responsive Design --- */
@media (max-width: 1024px) {
  .hero h1 { font-size: 2.25rem; }
  .hero-image-wrap { width: 50%; }
  .solutions-grid { grid-template-columns: 1fr 1fr; }
  .why-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .blog-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    gap: 0;
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    max-height: calc(100vh - 68px);
    overflow-y: auto;
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-menu a {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-light);
    border-radius: 0;
  }

  .nav-menu .has-dropdown > a::after {
    float: right;
  }

  .dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding: 0 0 0 16px;
    display: none;
  }

  .nav-menu .has-dropdown.open .dropdown {
    display: block;
  }

  .hamburger {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding: 110px 0 56px;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
    padding-right: 0;
    transform: none;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 1rem;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-image-wrap {
    display: none;
  }

  .hero-buttons {
    justify-content: center;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .stat-item::after {
    display: none !important;
  }

  .stat-number {
    font-size: 1.75rem;
  }

  .section {
    padding: 48px 0;
  }

  .section-title {
    font-size: 1.4rem;
  }

  .solutions-grid,
  .applications-grid,
  .blog-grid {
    grid-template-columns: 1fr;
  }

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

  /* tech-flow: mobile 2×2 grid instead of vertical stack */
  .tech-flow {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 28px 12px;
    margin-top: 32px;
  }

  .tech-step {
    flex: 0 0 calc(50% - 6px);
    min-width: 0;
    max-width: none;
  }

  .tech-step-circle {
    width: 52px;
    height: 52px;
    font-size: 1.3rem;
    margin-bottom: 12px;
  }

  .tech-step-circle::after {
    display: none;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  .page-hero h1 {
    font-size: 1.7rem;
  }

  .product-hero,
  .contact-grid,
  .about-hero-grid {
    grid-template-columns: 1fr;
  }

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

  .product-info .product-features {
    display: inline-block;
    text-align: left;
  }

  .product-info .btn-lg {
    margin-top: 8px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .contact-info-card,
  .contact-form {
    padding: 28px;
  }

  .btn-lg {
    padding: 12px 24px;
    font-size: 0.92rem;
  }

  .testimonial-card {
    padding: 32px 24px;
  }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.45rem; }
  .stat-number { font-size: 1.4rem; }
  .section-title { font-size: 1.25rem; }
  .why-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .container { padding: 0 16px; }
  .nav { padding: 0 16px; }
  .hero-badge { font-size: 0.78rem; }
  .cta-section h2 { font-size: 1.5rem; }
  .blog-article-header h1, .blog-article-header h2 { font-size: 1.5rem; }
  .page-hero h1 { font-size: 1.45rem; }

  /* Blog 列表模式：窄屏回退为图上文下 */
  .blog-card > a { flex-direction: column; }
  .blog-card-image { width: 100%; aspect-ratio: 16/9; min-height: 0; }
  .blog-card-content { padding: 18px 20px; }
}

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* --- Scroll Progress Bar --- */
.scroll-progress {
  position: fixed;
  top: 68px;
  left: 0;
  height: 2px;
  background: var(--accent);
  z-index: 999;
  transition: width 0.1s ease;
}

/* --- Selection --- */
::selection {
  background: var(--primary-tint);
  color: var(--primary-dark);
}

/* --- Focus Visible --- */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

/* ===== Language Switcher (dropdown) ===== */
.lang-switch {
  position: relative;
  display: inline-block;
  margin-left: 12px;
  vertical-align: middle;
}
.lang-switch select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  display: block;
  background: #ffffff;
  color: #003F7D;
  border: 1.5px solid #003F7D;
  border-radius: 8px;
  padding: 6px 30px 6px 12px;
  font-size: 0.8rem;
  font-weight: 700;
  font-family: inherit;
  line-height: 1.4;
  cursor: pointer;
  outline: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23003F7D' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");
  background-repeat: no-repeat;
  background-position: right 8px center;
  background-size: 11px;
  transition: border-color .15s, box-shadow .15s;
}
.lang-switch select:hover,
.lang-switch select:focus {
  border-color: #0E7C6B;
  box-shadow: 0 0 0 3px rgba(0,63,125,0.12);
}
/* 下拉选项：白底深字 */
.lang-switch select option {
  color: #0f172a;
  background: #fff;
}
/* 地球图标（select 左侧伪元素不可用于 select，故用背景叠加） */
@media (max-width: 900px) {
  .lang-switch { margin-left: 0; margin-top: 10px; }
}