/* ========================================
   探索化工 Tansochem - 企业官网样式
   主色调: 科技蓝 + 洁净白 + 环保绿
   响应式: 桌面 / 平板 / 手机
   ======================================== */

/* ==================== CSS Variables ==================== */
:root {
  --primary: #1a3a5c;
  --primary-dark: #0d2137;
  --primary-light: #26547c;
  --accent: #27ae60;
  --accent-dark: #1e8449;
  --accent-light: #2ecc71;
  --white: #ffffff;
  --gray-50: #f8fafb;
  --gray-100: #f0f4f5;
  --gray-200: #e2e8ea;
  --gray-300: #cbd5d8;
  --gray-400: #94a3a8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --text: #334155;
  --text-light: #64748b;
  --text-white: #f8fafb;
  --gradient: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  --gradient-accent: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1), 0 4px 10px rgba(0,0,0,0.05);
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --nav-height: 72px;
  --transition: 0.3s ease;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--white);
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-light); }
ul, ol { list-style: none; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ==================== Typography ==================== */
h1, h2, h3, h4, h5, h6 {
  color: var(--gray-900);
  line-height: 1.3;
  font-weight: 700;
}
h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

.section-title {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 12px;
  color: var(--gray-900);
}
.section-subtitle {
  font-size: 1.05rem;
  text-align: center;
  color: var(--text-light);
  margin-bottom: 48px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ==================== Buttons ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: var(--white);
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(39,174,96,0.3);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-1px);
}
.btn-outline-white {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.5);
}
.btn-outline-white:hover {
  background: var(--white);
  color: var(--primary);
}
.btn-sm { padding: 8px 18px; font-size: 0.85rem; }
.btn-lg { padding: 16px 36px; font-size: 1.05rem; }

/* ==================== Header / Navigation ==================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-200);
  z-index: 1000;
  transition: box-shadow var(--transition);
}
.header.scrolled { box-shadow: var(--shadow); }

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.logo-icon {
  width: 42px;
  height: 42px;
  background: var(--gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.25rem;
  font-weight: 800;
  flex-shrink: 0;
}
.logo-text {
  display: flex;
  flex-direction: column;
}
.logo-cn {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}
.logo-en {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-light);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav-menu { display: flex; align-items: center; gap: 2px; }
.nav-menu > li { position: relative; }
.nav-menu > li > a {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 10px 16px;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 6px;
  transition: all var(--transition);
}
.nav-menu > li > a:hover,
.nav-menu > li > a.active {
  color: var(--primary);
  background: var(--gray-100);
}

.nav-arrow { font-size: 0.6rem; margin-left: 2px; transition: transform var(--transition); }
.nav-menu > li:hover .nav-arrow { transform: rotate(180deg); }

/* Dropdown */
.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition);
  border: 1px solid var(--gray-200);
}
.nav-menu > li:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(4px);
}
.dropdown li a {
  display: block;
  padding: 10px 20px;
  font-size: 0.88rem;
  color: var(--text);
  transition: all var(--transition);
}
.dropdown li a:hover {
  background: var(--gray-50);
  color: var(--primary);
  padding-left: 24px;
}

.nav-phone {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.95rem;
}
.nav-phone-icon {
  width: 36px;
  height: 36px;
  background: var(--gray-100);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: all var(--transition);
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ==================== Hero Section ==================== */
.hero {
  margin-top: var(--nav-height);
  background: var(--gradient);
  background-image: url('/images/hero-bg.svg');
  background-size: cover;
  background-position: center;
  padding: 80px 0;
  position: relative;
  overflow: hidden;
  color: var(--text-white);
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: rgba(255,255,255,0.03);
  border-radius: 50%;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: rgba(255,255,255,0.02);
  border-radius: 50%;
}
.hero .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-content h1 {
  font-size: 3rem;
  color: var(--white);
  margin-bottom: 20px;
  line-height: 1.25;
}
.hero-content h1 span { color: var(--accent-light); }
.hero-content p {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.8);
  margin-bottom: 36px;
  line-height: 1.8;
  max-width: 520px;
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.hero-feature-card {
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
}
.hero-feature-card:hover {
  background: rgba(255,255,255,0.14);
  transform: translateY(-2px);
}
.hero-feature-card .feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(39,174,96,0.2);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}
.hero-feature-card h3 {
  font-size: 1.1rem;
  color: var(--white);
  margin-bottom: 8px;
}
.hero-feature-card p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
  line-height: 1.6;
}

/* ==================== Section Common ==================== */
.section { padding: 80px 0; }
.section-light { background: var(--gray-50); }
.section-dark { background: var(--primary); color: var(--text-white); }
.section-dark .section-title { color: var(--white); }
.section-dark .section-subtitle { color: rgba(255,255,255,0.7); }

/* ==================== Product Cards ==================== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
}
.product-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  border: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.product-card-image {
  height: 200px;
  background: var(--gray-50);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.product-card-image .placeholder-icon {
  font-size: 4rem;
  color: var(--gray-300);
}
.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.product-card-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  background: var(--accent);
  color: var(--white);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}
.product-card-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.product-card-body h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
  color: var(--gray-900);
}
.product-card-body .product-category {
  display: inline-block;
  background: var(--gray-100);
  color: var(--primary);
  padding: 2px 10px;
  border-radius: 4px;
  font-size: 0.8rem;
  margin-bottom: 12px;
}
.product-card-body p { font-size: 0.9rem; color: var(--text-light); line-height: 1.6; margin-bottom: 16px; }
.product-card-body .btn { margin-top: auto; align-self: flex-start; }

/* ==================== Solution Cards ==================== */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.solution-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  transition: all var(--transition);
}
.solution-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}
.solution-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: var(--gray-100);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  overflow: hidden;
  line-height: 1;
}
.solution-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.solution-card p { font-size: 0.9rem; color: var(--text-light); line-height: 1.6; }

/* ==================== Value Propositions ==================== */
.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.value-card {
  text-align: center;
  padding: 40px 28px;
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  transition: all var(--transition);
}
.value-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.value-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  background: var(--gradient);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--white);
}
.value-card h3 { font-size: 1.2rem; margin-bottom: 12px; }
.value-card p { font-size: 0.92rem; color: var(--text-light); line-height: 1.65; }

/* ==================== News Cards ==================== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
}
.news-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  transition: all var(--transition);
}
.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.news-card-image {
  height: 180px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
}
.news-card-image .placeholder-icon {
  font-size: 3rem;
  color: rgba(255,255,255,0.3);
}
.news-card-body { padding: 20px 24px; }
.news-card-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 10px;
  font-size: 0.8rem;
  color: var(--text-light);
}
.news-card-category {
  background: var(--accent);
  color: var(--white);
  padding: 2px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 500;
}
.news-card-body h3 { font-size: 1.05rem; margin-bottom: 8px; line-height: 1.5; }
.news-card-body p { font-size: 0.9rem; color: var(--text-light); line-height: 1.6; }
.news-card-body .read-more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 12px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary);
}

/* ==================== About Section ==================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-image {
  border-radius: var(--radius-lg);
  height: 400px;
  overflow: hidden;
}
.about-content h2 { margin-bottom: 20px; }
.about-content p { color: var(--text-light); line-height: 1.8; margin-bottom: 16px; }
.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 32px;
}
.about-stat { text-align: center; }
.about-stat .number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
}
.about-stat .label {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 4px;
}

/* ==================== FAQ Section ==================== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  color: var(--gray-800);
  transition: background var(--transition);
}
.faq-question:hover { background: var(--gray-50); }
.faq-question .faq-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  background: var(--gray-100);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  transition: all var(--transition);
}
.faq-item.active .faq-icon {
  background: var(--accent);
  color: var(--white);
  transform: rotate(45deg);
}
.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: all var(--transition);
  color: var(--text-light);
  line-height: 1.7;
}
.faq-item.active .faq-answer {
  padding: 0 24px 20px;
  max-height: 300px;
}

/* FAQ Search & Filter */
.faq-search {
  position: relative;
}
.faq-filter-btn {
  padding: 8px 18px;
  border: 1px solid var(--gray-300);
  border-radius: 20px;
  background: var(--white);
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}
.faq-filter-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.faq-filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--white);
}
.faq-item.hidden {
  display: none;
}

/* ==================== CTA Section ==================== */
.cta-section {
  background: var(--gradient-accent);
  padding: 60px 0;
  text-align: center;
  color: var(--white);
}
.cta-section h2 {
  color: var(--white);
  font-size: 2rem;
  margin-bottom: 12px;
}
.cta-section p {
  color: rgba(255,255,255,0.85);
  font-size: 1.05rem;
  margin-bottom: 28px;
}
.cta-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ==================== Contact Page ==================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
}
.contact-info-card {
  background: var(--primary);
  color: var(--text-white);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
}
.contact-info-card h3 {
  color: var(--white);
  margin-bottom: 28px;
  font-size: 1.3rem;
}
.contact-info-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  align-items: flex-start;
}
.contact-info-icon {
  width: 44px;
  height: 44px;
  background: rgba(255,255,255,0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}
.contact-info-text h4 {
  color: var(--accent-light);
  font-size: 0.85rem;
  margin-bottom: 4px;
}
.contact-info-text p { color: rgba(255,255,255,0.8); font-size: 0.92rem; }

.contact-form {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
}
.contact-form h3 { font-size: 1.3rem; margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 6px;
}
.form-group label .required { color: #e74c3c; }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 0.92rem;
  color: var(--text);
  transition: border-color var(--transition);
  background: var(--gray-50);
  font-family: inherit;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-light);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(26,58,92,0.08);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-success {
  display: none;
  text-align: center;
  padding: 40px;
}
.form-success.show { display: block; }
.form-success-icon {
  width: 64px;
  height: 64px;
  background: var(--accent);
  border-radius: 50%;
  color: var(--white);
  font-size: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

/* ==================== Table Styles (Specs) ==================== */
.specs-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--gray-200);
}
.specs-table th,
.specs-table td {
  padding: 14px 20px;
  text-align: left;
  font-size: 0.92rem;
}
.specs-table thead th {
  background: var(--primary);
  color: var(--white);
  font-weight: 600;
}
.specs-table tbody tr:nth-child(even) { background: var(--gray-50); }
.specs-table tbody tr:hover { background: var(--gray-100); }
.specs-table tbody td:first-child {
  font-weight: 600;
  color: var(--gray-700);
  width: 30%;
}

/* ==================== Breadcrumb ==================== */
.breadcrumb {
  padding: 12px 0;
  font-size: 0.85rem;
  color: var(--text-light);
}
.breadcrumb a { color: var(--text-light); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .separator { margin: 0 8px; color: var(--gray-400); }
.breadcrumb .current { color: var(--primary); font-weight: 500; }

/* ==================== Page Header ==================== */
.page-header {
  margin-top: var(--nav-height);
  background: var(--gradient);
  background-image: url('/images/hero-bg.svg');
  background-size: cover;
  background-position: center;
  padding: 72px 0;
  color: var(--white);
  text-align: center;
  position: relative;
}
.page-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-accent);
}
.page-header h1 { color: var(--white); font-size: 2rem; }
.page-header p { color: rgba(255,255,255,0.75); margin-top: 12px; font-size: 1rem; max-width: 600px; margin-left: auto; margin-right: auto; }

/* ==================== Product Detail ==================== */
.product-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.product-detail-image {
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 8rem;
  color: var(--gray-300);
  border: 1px solid var(--gray-200);
}
.product-detail-info h2 { font-size: 1.6rem; margin-bottom: 8px; }
.product-detail-info .product-category-badge {
  display: inline-block;
  background: var(--gray-100);
  color: var(--primary);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 500;
  margin-bottom: 16px;
}
.product-detail-info .product-desc { color: var(--text-light); line-height: 1.8; margin-bottom: 24px; }

.product-features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}
.product-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px;
  background: var(--gray-50);
  border-radius: var(--radius);
}
.product-feature-item .pf-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}
.product-feature-item .pf-text h4 { font-size: 0.88rem; margin-bottom: 2px; }
.product-feature-item .pf-text p { font-size: 0.8rem; color: var(--text-light); }

/* ==================== Tags / Badges ==================== */
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  display: inline-block;
  padding: 6px 14px;
  background: var(--gray-100);
  color: var(--primary);
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 500;
}
.tag-accent { background: rgba(39,174,96,0.1); color: var(--accent-dark); }

/* ==================== Certifications ==================== */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}
.cert-card {
  text-align: center;
  padding: 24px 16px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  transition: all var(--transition);
}
.cert-card:hover { border-color: var(--primary-light); box-shadow: var(--shadow); }
.cert-icon { font-size: 2.5rem; margin-bottom: 10px; }
.cert-card h4 { font-size: 0.9rem; color: var(--gray-700); }

/* ==================== Pagination ==================== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 40px;
}
.pagination a,
.pagination span {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--text);
  transition: all var(--transition);
}
.pagination a:hover { background: var(--primary); color: var(--white); border-color: var(--primary); }
.pagination .active { background: var(--primary); color: var(--white); border-color: var(--primary); }
.pagination .disabled { color: var(--gray-400); pointer-events: none; }

/* ==================== Footer ==================== */
.footer {
  background: var(--primary-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-about .logo { margin-bottom: 16px; }
.footer-about .logo-cn { color: var(--white); }
.footer-about .logo-en { color: rgba(255,255,255,0.5); }
.footer-about p { font-size: 0.88rem; line-height: 1.7; margin-bottom: 20px; }
.footer h4 {
  color: var(--white);
  font-size: 1rem;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 12px;
}
.footer h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--accent);
}
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  color: rgba(255,255,255,0.6);
  font-size: 0.88rem;
  transition: all var(--transition);
}
.footer-links a:hover { color: var(--accent-light); padding-left: 4px; }

.footer-contact-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 14px;
  font-size: 0.88rem;
}
.footer-contact-item .fc-icon { color: var(--accent-light); flex-shrink: 0; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 20px 0;
  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(255,255,255,0.5); }

/* ==================== Article Detail ==================== */
.article-content {
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.9;
  color: var(--text);
}
.article-content h2,
.article-content h3 { margin: 32px 0 16px; color: var(--gray-900); }
.article-content p { margin-bottom: 16px; }
.article-content ul,
.article-content ol { margin-bottom: 16px; padding-left: 24px; }
.article-content li { margin-bottom: 8px; list-style: disc; }
.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-light);
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--gray-200);
}

/* ==================== Mobile Nav Overlay ==================== */
.mobile-nav-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  z-index: 999;
}
.mobile-nav-overlay.active { display: block; }

.mobile-nav {
  position: fixed;
  top: 0;
  right: -320px;
  width: 300px;
  height: 100vh;
  background: var(--white);
  z-index: 1001;
  padding: 80px 20px 40px;
  overflow-y: auto;
  transition: right var(--transition);
}
.mobile-nav.active { right: 0; }
.mobile-nav a {
  display: block;
  padding: 14px 16px;
  font-size: 1rem;
  color: var(--text);
  border-bottom: 1px solid var(--gray-100);
  font-weight: 500;
}
.mobile-nav a:hover { color: var(--primary); background: var(--gray-50); }
.mobile-nav .sub-link { padding-left: 32px; font-size: 0.9rem; font-weight: 400; }
.mobile-nav-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
  border: none;
  background: var(--gray-100);
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ==================== Back to Top ==================== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.25rem;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition);
  opacity: 0;
  visibility: hidden;
  z-index: 99;
  display: flex;
  align-items: center;
  justify-content: center;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--accent); transform: translateY(-2px); }

/* ==================== 404 / 500 Pages ==================== */
.error-page {
  text-align: center;
  padding: 120px 0;
}
.error-page .error-code {
  font-size: 8rem;
  font-weight: 800;
  color: var(--gray-200);
  line-height: 1;
}
.error-page h2 { margin: 16px 0; }
.error-page p { color: var(--text-light); margin-bottom: 32px; }

/* ==================== Responsive: Tablet (≤1024px) ==================== */
@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; gap: 40px; }
  .hero-content h1 { font-size: 2.25rem; }
  .values-grid { grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .product-detail-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-image { height: 300px; }
}

/* ==================== Responsive: Tablet (≤768px) ==================== */
@media (max-width: 768px) {
  :root { --nav-height: 60px; }

  h1 { font-size: 2rem; }
  h2 { font-size: 1.6rem; }
  .section { padding: 56px 0; }
  .section-title { font-size: 1.6rem; }

  /* Navigation */
  .nav-menu, .nav-phone { display: none; }
  .hamburger { display: flex; }

  /* Hero */
  .hero { padding: 48px 0; }
  .hero-content h1 { font-size: 1.75rem; }
  .hero-content p { font-size: 0.95rem; }

  /* Grids */
  .values-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
  .product-grid { grid-template-columns: 1fr; max-width: 500px; margin: 0 auto; }
  .news-grid { grid-template-columns: 1fr; max-width: 500px; margin: 0 auto; }
  .solution-grid { grid-template-columns: 1fr 1fr; }
  .product-features-grid { grid-template-columns: 1fr; }

  /* About */
  .about-stats { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .about-stat .number { font-size: 1.5rem; }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }

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

  /* CTA */
  .cta-section h2 { font-size: 1.5rem; }

  /* Page header */
  .page-header h1 { font-size: 1.6rem; }
}

/* ==================== Responsive: Mobile (≤480px) ==================== */
@media (max-width: 480px) {
  .container { padding: 0 16px; }

  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.35rem; }
  h3 { font-size: 1.1rem; }

  .hero { padding: 36px 0; }
  .hero-content h1 { font-size: 1.4rem; }
  .hero-content p { font-size: 0.88rem; }
  .hero-btns { flex-direction: column; }
  .hero-btns .btn { width: 100%; text-align: center; }

  .solution-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .about-stats { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .about-stat .number { font-size: 1.25rem; }
  .about-stat .label { font-size: 0.72rem; }

  .btn-lg { padding: 14px 24px; font-size: 0.95rem; }
  .section-title { font-size: 1.35rem; }

  .product-card-body { padding: 16px; }
  .news-card-body { padding: 16px; }
  .contact-form { padding: 24px 16px; }
  .contact-info-card { padding: 28px 20px; }

  .page-header { padding: 32px 0; }
  .page-header h1 { font-size: 1.35rem; }

  .product-detail-image { height: 220px; font-size: 5rem; }
  .specs-table th, .specs-table td { padding: 10px 12px; font-size: 0.8rem; }
}

/* ==================== Utility Classes ==================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-5 { margin-top: 48px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-5 { margin-bottom: 48px; }
.hidden { display: none; }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); }

/* ==================== Print Styles ==================== */
@media print {
  .header, .footer, .back-to-top, .cta-section, .mobile-nav, .mobile-nav-overlay, .hamburger { display: none; }
  .hero, .page-header { margin-top: 0; background: none; color: var(--text); }
  .hero-content h1, .hero-content p { color: var(--text); }
  .hero-feature-card { background: var(--white); border-color: var(--gray-300); }
}