/* ============================================
   KSL 科赛乐科技 企业官网 样式系统
   Version: 1.0 | Phase 1
   ============================================ */

/* --- Reset & Variables --- */
:root {
  --color-primary: #007A38;
  --color-primary-dark: #005C2A;
  --color-primary-light: #E8F5EE;
  --color-accent: #00A86B;
  --color-accent-dark: #008055;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F5FAF7;
  --color-bg-dark: #0D2818;
  --color-text: #1A1A2E;
  --color-text-secondary: #5A6377;
  --color-text-light: #8892A4;
  --color-border: #E2E8F0;
  --color-border-light: #F0F3F7;
  --color-white: #FFFFFF;
  --color-red: #DC3545;
  --color-warning: #F0AD4E;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Consolas", monospace;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);

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

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.15s ease;

  --max-width: 1200px;
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}

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

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

ul, ol { list-style: none; }

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

h1 { font-size: 2.75rem; letter-spacing: -0.02em; }
h2 { font-size: 2.25rem; letter-spacing: -0.01em; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.2rem; }

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

.section {
  padding: 80px 0;
}
.section-sm { padding: 48px 0; }
.section-lg { padding: 120px 0; }

/* --- Header / Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  z-index: 1000;
  transition: box-shadow 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-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.01em;
}
.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary), #009A45);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
  font-weight: 800;
}

.nav { display: flex; gap: 4px; align-items: center; }
.nav a {
  display: block;
  padding: 8px 16px;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}
.nav a:hover, .nav a.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* --- Hero Section --- */
.hero {
  padding: 160px 0 100px;
  background: linear-gradient(160deg, #F0FAF4 0%, #D4EDDA 30%, #FFFFFF 70%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0,122,56,0.06) 0%, transparent 70%);
  border-radius: 50%;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -80px;
  left: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0,168,107,0.05) 0%, transparent 70%);
  border-radius: 50%;
}

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

.hero-content {
  max-width: 640px;
}
.hero-tag {
  display: inline-block;
  padding: 6px 16px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 20px;
  margin-bottom: 20px;
}
.hero h1 {
  margin-bottom: 20px;
  color: var(--color-text);
}
.hero h1 span { color: var(--color-primary); }
.hero p {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-family);
  line-height: 1;
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0,122,56,0.3);
}
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary-light);
  transform: translateY(-1px);
}
.btn-accent {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}
.btn-accent:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0,168,107,0.3);
}
.btn-sm {
  padding: 10px 20px;
  font-size: 0.9rem;
}

/* --- Section Headers --- */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-header h2 {
  margin-bottom: 12px;
}
.section-header p {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}
.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 20px;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --- Product Grid --- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.product-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}
.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: opacity var(--transition);
}
.product-card:hover::before { opacity: 1; }

.product-card .product-icon {
  width: 100%;
  aspect-ratio: 3/2;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 16px;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}
.product-card .product-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.product-card h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
  color: var(--color-text);
}
.product-card .product-model {
  font-size: 0.85rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}
.product-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}
.product-card .product-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.product-card .tag {
  display: inline-block;
  padding: 3px 10px;
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  border-radius: 12px;
  font-weight: 500;
}
.product-card .btn-sm {
  margin-top: auto;
}

/* --- Category Filter --- */
.category-filter {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.category-filter button {
  padding: 10px 24px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 24px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-family);
}
.category-filter button:hover,
.category-filter button.active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* --- Feature Section --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.feature-card {
  text-align: center;
  padding: 40px 24px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.feature-card .feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  box-shadow: var(--shadow-sm);
}
.feature-card h4 {
  margin-bottom: 8px;
  font-size: 1.05rem;
}
.feature-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --- Stats Section --- */
.stats-section {
  background: linear-gradient(135deg, var(--color-bg-dark), #0A2E1A);
  color: var(--color-white);
  padding: 80px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  text-align: center;
}
.stat-item .stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, #4DD98B, var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}
.stat-item .stat-label {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.7);
  font-weight: 500;
}

/* --- About Page --- */
.about-hero {
  padding: 160px 0 80px;
  background: linear-gradient(160deg, #F0FAF4, #FFFFFF);
  text-align: center;
}
.about-hero p {
  max-width: 720px;
  margin: 20px auto 0;
  font-size: 1.1rem;
  color: var(--color-text-secondary);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
.about-text h3 { margin-top: 32px; margin-bottom: 12px; }
.about-text h3:first-child { margin-top: 0; }
.about-text p { color: var(--color-text-secondary); margin-bottom: 16px; line-height: 1.8; }
.about-list { margin-bottom: 24px; }
.about-list li {
  padding: 8px 0;
  padding-left: 28px;
  position: relative;
  color: var(--color-text-secondary);
}
.about-list li::before {
  content: '◆';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-size: 0.7rem;
  top: 11px;
}

.about-sidebar {
  position: sticky;
  top: 100px;
}
.about-card {
  background: var(--color-primary-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
}
.about-card h4 { margin-bottom: 16px; color: var(--color-primary); }
.about-card p { font-size: 0.95rem; color: var(--color-text-secondary); margin-bottom: 8px; }

/* --- Product Detail --- */
.product-hero {
  padding: 160px 0 60px;
  background: linear-gradient(160deg, #F0FAF4, #FFFFFF);
}
.product-hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.product-hero-content h1 { margin-bottom: 16px; }
.product-hero-content .product-model-hero {
  font-size: 1.1rem;
  color: var(--color-primary);
  font-weight: 600;
  font-family: var(--font-mono);
  margin-bottom: 16px;
}
.product-hero-content p {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 28px;
}
.product-hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.product-hero-visual .product-placeholder {
  width: 100%;
  max-width: 400px;
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--color-bg-alt), #D4E8DC);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  color: var(--color-primary);
  opacity: 0.6;
}
.product-hero-visual .product-hero-img {
  width: 100%;
  max-width: 400px;
  height: auto;
  aspect-ratio: 4/3;
  object-fit: contain;
  border-radius: var(--radius-lg);
  background: var(--color-white);
  box-shadow: 0 4px 24px rgba(0,0,0,.08);
}

.specs-section { background: var(--color-bg-alt); }
.specs-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.specs-table tr { border-bottom: 1px solid var(--color-border); }
.specs-table tr:last-child { border-bottom: none; }
.specs-table td {
  padding: 16px 24px;
  font-size: 0.95rem;
}
.specs-table td:first-child {
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-bg-alt);
  width: 200px;
  white-space: nowrap;
}
.specs-table td:last-child {
  color: var(--color-text-secondary);
}

.feature-list-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.feature-list-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}
.feature-list-item:hover {
  background: var(--color-primary-light);
  transform: translateX(4px);
}
.feature-list-item .feature-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
  margin-top: 6px;
}
.feature-list-item h4 { font-size: 1rem; margin-bottom: 4px; }
.feature-list-item p { font-size: 0.9rem; color: var(--color-text-secondary); }

/* --- Solutions Page --- */
.solution-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 80px;
}
.solution-block:last-child { margin-bottom: 0; }
.solution-block:nth-child(even) { direction: rtl; }
.solution-block:nth-child(even) .solution-text { direction: ltr; }

.solution-text h3 { margin-bottom: 16px; color: var(--color-primary); }
.solution-text p { color: var(--color-text-secondary); margin-bottom: 12px; line-height: 1.8; }
.solution-text ul { margin-top: 16px; }
.solution-text ul li {
  padding: 6px 0;
  padding-left: 24px;
  position: relative;
  color: var(--color-text-secondary);
}
.solution-text ul li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}
.solution-visual {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--color-primary);
  opacity: 0.4;
}

/* --- Contact Page --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
}
.contact-info h3 { margin-bottom: 20px; }
.contact-info-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}
.contact-info-item:last-child { border-bottom: none; }
.contact-icon {
  width: 44px;
  height: 44px;
  background: var(--color-primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.contact-info-item h4 { font-size: 0.95rem; margin-bottom: 4px; }
.contact-info-item p { font-size: 0.9rem; color: var(--color-text-secondary); }

.contact-form {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: 40px;
}
.contact-form h3 { margin-bottom: 28px; }
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font-family);
  background: var(--color-white);
  transition: border-color var(--transition-fast);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0,122,56,0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* --- Knowledge / Blog --- */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.knowledge-card {
  display: block;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}
.knowledge-card h4 {
  transition: color var(--transition);
}
.knowledge-card:hover h4 {
  color: var(--color-primary);
}
.knowledge-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.knowledge-card .knowledge-thumb {
  width: 100%;
  aspect-ratio: 16/10;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: var(--color-primary);
  opacity: 0.6;
}
.knowledge-card .knowledge-body {
  padding: 24px;
}
.knowledge-card .knowledge-date {
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-bottom: 8px;
}
.knowledge-card h4 {
  font-size: 1.05rem;
  line-height: 1.5;
  margin-bottom: 8px;
}
.knowledge-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --- Breadcrumb --- */
.breadcrumb {
  padding: 100px 0 20px;
  font-size: 0.85rem;
  color: var(--color-text-light);
}
.breadcrumb a { color: var(--color-text-light); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb span { color: var(--color-text); font-weight: 500; }

/* --- Footer --- */
.footer {
  background: var(--color-bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 30px;
}
.footer-brand .logo { color: var(--color-white); margin-bottom: 16px; }
.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: 20px;
}
.footer h4 {
  color: var(--color-white);
  font-size: 0.95rem;
  margin-bottom: 16px;
}
.footer-links a, .footer-links p {
  display: block;
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  padding: 4px 0;
  transition: color var(--transition-fast);
}
.footer-links a:hover { color: var(--color-white); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 12px;
}

/* --- Page Header (for sub pages) --- */
.page-header {
  padding: 160px 0 60px;
  background: linear-gradient(160deg, #F0FAF4, #FFFFFF);
  text-align: center;
}
.page-header h1 { margin-bottom: 12px; }
.page-header p {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* --- CTA Banner --- */
.cta-banner {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-white);
  padding: 80px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.cta-banner h2 {
  color: var(--color-white);
  margin-bottom: 16px;
  position: relative;
}
.cta-banner p {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 32px;
  position: relative;
}
.cta-banner .btn-outline {
  color: var(--color-white);
  border-color: rgba(255,255,255,0.5);
  position: relative;
}
.cta-banner .btn-outline:hover {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
}

/* ============ Academy / 网络学院 ============ */
.academy-hero {
  padding: 160px 0 80px;
  background: linear-gradient(160deg, #F0FAF4, #FFFFFF);
}
.academy-hero .container {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.academy-hero-content {
  max-width: 680px;
}
.academy-hero-content h1 { margin-bottom: 16px; }
.academy-hero-content h1 span { color: var(--color-primary); }
.academy-hero-content p {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 32px;
}
.academy-hero-content .hero-actions {
  justify-content: center;
}

/* Filter Tabs */
.academy-filter {
  padding: 0 0 24px;
}
.filter-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}
.filter-tab {
  padding: 8px 20px;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  background: var(--color-white);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.filter-tab:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.filter-tab.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

/* Video Grid */
.academy-videos {
  padding: 0 0 80px;
}
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.video-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition);
}
.video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.1);
  border-color: var(--color-primary);
}
.video-card.hidden {
  display: none;
}

/* Video Thumbnail */
.video-thumb {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--color-bg-alt);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.video-thumb-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  background: linear-gradient(135deg, var(--color-primary-light), #D4E8DC);
}
.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  background: rgba(0, 122, 56, 0.85);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  z-index: 2;
}
.video-play-btn::after {
  content: '';
  width: 0;
  height: 0;
  border-left: 16px solid white;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  margin-left: 4px;
}
.video-card:hover .video-play-btn {
  background: var(--color-primary);
  transform: translate(-50%, -50%) scale(1.1);
  box-shadow: 0 4px 20px rgba(0,122,56,0.3);
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.7);
  color: var(--color-white);
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 500;
}

/* Video Info */
.video-info {
  padding: 16px 20px 20px;
}
.video-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 2px 10px;
  border-radius: 100px;
  margin-bottom: 10px;
}
.video-info h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-info p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Video Modal */
.video-modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: none;
}
.video-modal.open {
  display: block;
}
.video-modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.75);
  animation: fadeIn 0.3s ease;
}
.video-modal-content {
  position: relative;
  z-index: 1;
  width: 90%;
  max-width: 960px;
  margin: 60px auto 0;
  animation: fadeInUp 0.4s ease;
}
.video-modal-close {
  position: absolute;
  top: -44px;
  right: 0;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 2px solid rgba(255,255,255,0.5);
  border-radius: 50%;
  color: var(--color-white);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}
.video-modal-close:hover {
  background: var(--color-white);
  color: var(--color-text);
  border-color: var(--color-white);
}
.video-modal-player {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.video-modal-player iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}
.video-modal-info {
  margin-top: 12px;
  padding: 0 4px;
}
.video-modal-info h3 {
  color: var(--color-white);
  font-size: 1.1rem;
  margin-bottom: 4px;
}
.video-modal-tag {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
}

/* Academy Guide */
.academy-guide {
  padding: 0 0 80px;
}
.guide-card {
  background: var(--color-primary-light);
  border-radius: var(--radius-xl);
  padding: 40px;
  text-align: center;
}
.guide-card h3 {
  margin-bottom: 8px;
  color: var(--color-primary);
}
.guide-card > p {
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  font-size: 1rem;
}
.guide-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.guide-step {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: left;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.step-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}
.guide-step strong {
  display: block;
  color: var(--color-text);
  margin-bottom: 4px;
}
.guide-step p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.85rem; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .about-content { grid-template-columns: 1fr; }
  .solution-block { grid-template-columns: 1fr; }
  .solution-block:nth-child(even) { direction: ltr; }
  .contact-grid { grid-template-columns: 1fr; }
  .product-hero .container { grid-template-columns: 1fr; }
  .feature-list-grid { grid-template-columns: 1fr; }
  .knowledge-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .guide-steps { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .header .nav {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: 24px;
    gap: 8px;
    display: none;
    overflow-y: auto;
  }
  .header .nav.open { display: flex; }
  .header .nav a {
    font-size: 1.1rem;
    padding: 12px 16px;
    width: 100%;
  }
  .nav-toggle { display: flex; }

  h1 { font-size: 1.85rem; }
  h2 { font-size: 1.55rem; }
  .section { padding: 56px 0; }
  .hero { padding: 120px 0 60px; }
  .hero p { font-size: 1rem; }

  .product-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .knowledge-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: 1fr; }
  .video-modal-content { width: 95%; margin-top: 40px; }
  .guide-steps { grid-template-columns: 1fr; }
  .specs-table td:first-child { width: 120px; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .category-filter { gap: 8px; }
  .category-filter button { padding: 8px 16px; font-size: 0.8rem; }
  .contact-form { padding: 24px; }
}


/* --- FAQ Page Styles --- */
.faq-intro {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 48px;
  padding: 24px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  line-height: 1.8;
}
.faq-intro strong { color: var(--color-primary); }

.faq-cluster-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.faq-cluster-icon { font-size: 2rem; line-height: 1; }
.faq-cluster-header h2 { margin: 0; font-size: 1.5rem; color: var(--color-primary-dark); }
.faq-cluster-keywords { color: var(--color-text-secondary); font-size: 0.9rem; margin: 4px 0 0; }

.faq-list { margin-bottom: 16px; }
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: var(--color-primary-light); }
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 16px 20px;
  background: var(--color-white);
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  font-family: inherit;
  transition: var(--transition);
}
.faq-question:hover { color: var(--color-primary); }
.faq-question.active { color: var(--color-primary); background: var(--color-primary-light); }
.faq-toggle-icon {
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--color-text-secondary);
  transition: var(--transition);
  min-width: 24px;
  text-align: center;
}
.faq-question.active .faq-toggle-icon { color: var(--color-primary); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background: var(--color-bg-alt);
}
.faq-answer p { padding: 16px 20px; line-height: 1.8; color: var(--color-text-secondary); }
.faq-divider { height: 1px; background: var(--color-border-light); margin: 32px 0; }

.product-faq-section { background: var(--color-bg-alt); padding: 48px 0; }
.product-faq-section h2 { text-align: center; margin-bottom: 32px; color: var(--color-primary-dark); }

@media (max-width: 768px) {
  .faq-cluster-header { gap: 8px; }
  .faq-cluster-header h2 { font-size: 1.2rem; }
  .faq-question { padding: 12px 16px; font-size: 0.95rem; }
  .faq-answer p { padding: 12px 16px; }
}

/* --- Animations --- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
.animate-in {
  animation: fadeInUp 0.6s ease forwards;
}

/* ===== 品牌历史页 History Timeline ===== */
.hist-intro{max-width:900px;margin:0 0 34px;}
.hist-intro p{font-size:15.5px;line-height:1.95;color:var(--color-text-secondary);margin-bottom:12px;}
.hist-note{background:#FFFBF0;border-left:3px solid var(--color-warning);border-radius:var(--radius-sm);padding:12px 16px;font-size:13.5px;line-height:1.8;color:#7A5A2A;margin:0;}
.hist-h2{font-size:24px;color:var(--color-primary);border-left:4px solid var(--color-primary);padding-left:12px;margin:38px 0 18px;}
.tl{position:relative;padding-left:14px;}
.tl::before{content:"";position:absolute;left:74px;top:8px;bottom:8px;width:2px;background:linear-gradient(180deg,var(--color-primary-light),var(--color-border));}
.tl-item{position:relative;display:flex;gap:26px;margin-bottom:22px;}
.tl-year{flex:0 0 62px;text-align:right;font-size:16px;font-weight:800;color:var(--color-primary);padding-top:12px;line-height:1.3;}
.tl-body{flex:1;background:var(--color-white);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:16px 20px;box-shadow:var(--shadow-sm);position:relative;}
.tl-body::before{content:"";position:absolute;left:-31px;top:20px;width:10px;height:10px;border-radius:50%;background:var(--color-primary);border:2px solid var(--color-white);box-shadow:0 0 0 2px var(--color-primary-light);}
.tl-body h3{font-size:16.5px;margin:0 0 8px;color:var(--color-text);line-height:1.5;}
.tl-body p{font-size:14.5px;line-height:1.9;color:var(--color-text-secondary);margin:0 0 6px;}
.tl-src{font-size:12.5px!important;color:var(--color-text-light)!important;margin:8px 0 0!important;padding-top:8px;border-top:1px dashed var(--color-border-light);}
.tl-hl .tl-body{border-color:var(--color-primary);background:linear-gradient(180deg,#FBFEFC,#FFFFFF);box-shadow:var(--shadow-md);}
.tl-hl .tl-year{font-size:18px;}
.hist-panel{background:var(--color-bg-alt);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:22px 26px;}
.hist-panel p{font-size:15px;line-height:1.95;color:var(--color-text-secondary);margin:0 0 14px;}
.hist-panel p:last-child{margin-bottom:0;}
.hist-chain{margin:0 0 14px;padding-left:22px;}
.hist-chain li{font-size:14.5px;line-height:1.9;color:var(--color-text-secondary);margin-bottom:8px;}
.hist-chain b{color:var(--color-primary);}
.hist-links{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px;}
.hist-links a{display:block;padding:14px 18px;border:1px solid var(--color-border);border-radius:var(--radius-sm);font-size:14.5px;color:var(--color-text);text-decoration:none;transition:all .2s;background:var(--color-white);}
.hist-links a:hover{border-color:var(--color-primary);color:var(--color-primary);background:var(--color-primary-light);transform:translateY(-1px);}
.hist-sources{background:var(--color-bg-alt);border-radius:var(--radius-md);padding:22px 26px;}
.hist-sources h3{font-size:17px;margin:0 0 12px;color:var(--color-text);}
.hist-sources ul{margin:0;padding-left:20px;}
.hist-sources li{font-size:13.5px;line-height:1.85;color:var(--color-text-secondary);margin-bottom:6px;}
@media (max-width:768px){
  .tl::before{left:6px;}
  .tl-item{flex-direction:column;gap:8px;padding-left:26px;}
  .tl-year{text-align:left;padding-top:0;font-size:15px;}
  .tl-body::before{left:-26px;top:16px;}
}