:root {
  --easing: cubic-bezier(0.4, 0.0, 0.2, 1);
  --easing-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-fast: 0.2s var(--easing);
  --transition: 0.4s var(--easing);
  
  --bg-primary: #fbfbfd;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f5f5f7;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --text-primary: #1d1d1f;
  --text-secondary: #515154;
  --text-tertiary: #86868b;
  --border-color: rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.12);
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

[data-bs-theme="dark"] {
  --bg-primary: #000000;
  --bg-secondary: #1c1c1e;
  --bg-tertiary: #2c2c2e;
  --bg-glass: rgba(22, 22, 23, 0.72);
  --text-primary: #f5f5f7;
  --text-secondary: #a1a1a6;
  --text-tertiary: #6e6e73;
  --border-color: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.6);
  --accent: #2997ff;
}

* { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}
::selection { background: var(--accent); color: white; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--text-tertiary); border-radius: 10px; border: 2px solid var(--bg-primary); }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

.gradient-text {
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ========== Loader ========== */
.loader { position: fixed; inset: 0; background: var(--bg-primary); z-index: 9999; display: flex; align-items: center; justify-content: center; transition: opacity 0.6s var(--easing), visibility 0.6s var(--easing); }
.loader.hidden { opacity: 0; visibility: hidden; }
.loader-logo { font-family: 'Playfair Display', serif; font-size: 3rem; font-weight: 700; background: var(--gradient-1); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; animation: pulse 1.5s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.6; transform: scale(0.95); } }

/* ========== Navbar ========== */
.navbar-custom { position: fixed; top: 0; left: 0; right: 0; z-index: 1030; padding: 1rem 0; transition: all var(--transition); background: transparent; }
.navbar-custom.scrolled { background: var(--bg-glass); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px); padding: 0.6rem 0; border-bottom: 1px solid var(--border-color); }
.navbar-brand-custom { font-family: 'Playfair Display', serif; font-size: 1.4rem; font-weight: 700; color: var(--text-primary) !important; text-decoration: none; display: flex; align-items: center; gap: 0.5rem; transition: opacity var(--transition); }
.navbar-brand-custom:hover { opacity: 0.7; }
.brand-en { font-size: 0.85rem; color: var(--text-tertiary); font-weight: 400; margin-left: 0.3rem; }
.brand-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--gradient-1); animation: dotPulse 2s ease-in-out infinite; }
@keyframes dotPulse { 0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(102, 126, 234, 0.5); } 50% { transform: scale(1.1); box-shadow: 0 0 0 8px rgba(102, 126, 234, 0); } }

.nav-menu { display: flex; gap: 2rem; list-style: none; margin: 0; padding: 0; }
.nav-menu a { color: var(--text-primary); text-decoration: none; font-size: 0.9rem; font-weight: 500; position: relative; padding: 0.5rem 0; transition: color var(--transition); }
.nav-menu a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--accent); transition: width var(--transition); }
.nav-menu a:hover, .nav-menu a.active { color: var(--accent); }
.nav-menu a:hover::after, .nav-menu a.active::after { width: 100%; }

.nav-actions { display: flex; align-items: center; gap: 0.5rem; }
.nav-btn { width: 40px; height: 40px; border-radius: 50%; border: none; background: transparent; color: var(--text-primary); display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all var(--transition); font-size: 1.1rem; }
.nav-btn:hover { background: var(--bg-tertiary); transform: scale(1.05); }
.theme-toggle .bi-moon-stars-fill { display: none; }
[data-bs-theme="dark"] .theme-toggle .bi-sun-fill { display: none; }
[data-bs-theme="dark"] .theme-toggle .bi-moon-stars-fill { display: inline-block; }

/* Search & Mobile Menu */
.search-overlay { position: fixed; inset: 0; background: var(--bg-glass); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); z-index: 1050; opacity: 0; visibility: hidden; transition: opacity var(--transition), visibility var(--transition); display: flex; align-items: flex-start; justify-content: center; padding-top: 15vh; }
.search-overlay.active { opacity: 1; visibility: visible; }
.search-box { width: 90%; max-width: 600px; transform: translateY(-20px) scale(0.95); opacity: 0; transition: all var(--transition); }
.search-overlay.active .search-box { transform: translateY(0) scale(1); opacity: 1; }
.search-input { width: 100%; padding: 1.2rem 1.5rem; font-size: 1.5rem; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 20px; color: var(--text-primary); outline: none; box-shadow: var(--shadow-lg); }
.search-hint { color: var(--text-tertiary); font-size: 0.85rem; margin-top: 1rem; text-align: center; }

.mobile-menu { position: fixed; inset: 0; background: var(--bg-primary); z-index: 1040; opacity: 0; visibility: hidden; transition: opacity var(--transition), visibility var(--transition); display: flex; align-items: center; justify-content: center; }
.mobile-menu.active { opacity: 1; visibility: visible; }
.mobile-menu ul { list-style: none; padding: 0; text-align: center; }
.mobile-menu li { margin: 1.5rem 0; }
.mobile-menu a { font-family: 'Playfair Display', serif; font-size: 2rem; font-weight: 600; color: var(--text-primary); text-decoration: none; }
.mobile-menu a:hover { color: var(--accent); }

@media (max-width: 991px) {
  .nav-menu { display: none; }
  .nav-actions .hamburger { display: flex; }
}
@media (min-width: 992px) {
  .nav-actions .hamburger { display: none; }
}

/* ========== 首页 Hero ========== */
.hero-home { padding: 100px 2rem 4rem; position: relative; overflow: hidden; min-height: 100vh; display: flex; align-items: center; }
.hero-bg-grid { position: absolute; inset: 0; background-image: 
  linear-gradient(var(--border-color) 1px, transparent 1px),
  linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
  background-size: 60px 60px; opacity: 0.5; mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%); }
.hero-container { max-width: 1200px; margin: 0 auto; width: 100%; position: relative; z-index: 1; }
.hero-badge { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.5rem 1.2rem; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 30px; font-size: 0.85rem; font-weight: 500; color: var(--accent); margin-bottom: 2rem; box-shadow: var(--shadow-sm); }
.hero-title { font-family: 'Playfair Display', serif; font-size: clamp(2.5rem, 6vw, 5rem); font-weight: 700; line-height: 1.1; margin-bottom: 1.5rem; letter-spacing: -0.02em; }
.hero-desc { font-size: 1.15rem; color: var(--text-secondary); line-height: 1.7; max-width: 700px; margin-bottom: 2.5rem; }
.hero-cta { display: flex; gap: 1rem; margin-bottom: 4rem; flex-wrap: wrap; }
.btn-primary-lg { padding: 0.9rem 2rem; background: var(--text-primary); color: var(--bg-primary); border-radius: 30px; text-decoration: none; font-weight: 600; font-size: 0.95rem; display: inline-flex; align-items: center; gap: 0.5rem; transition: all var(--transition); border: none; cursor: pointer; }
.btn-primary-lg:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); color: var(--bg-primary); gap: 0.8rem; }
.btn-outline-lg { padding: 0.9rem 2rem; background: transparent; color: var(--text-primary); border: 1.5px solid var(--border-color); border-radius: 30px; text-decoration: none; font-weight: 600; font-size: 0.95rem; display: inline-flex; align-items: center; gap: 0.5rem; transition: all var(--transition); }
.btn-outline-lg:hover { border-color: var(--text-primary); background: var(--bg-tertiary); color: var(--text-primary); }
.hero-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; padding-top: 3rem; border-top: 1px solid var(--border-color); }
@media (max-width: 768px) { .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 1.5rem; } }
.stat-item { text-align: left; }
.stat-num { font-family: 'Playfair Display', serif; font-size: 2.5rem; font-weight: 700; background: var(--gradient-1); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; line-height: 1; }
.stat-label { color: var(--text-tertiary); font-size: 0.9rem; margin-top: 0.5rem; }

/* ========== Section 通用 ========== */
.section-block { padding: 6rem 2rem; max-width: 1400px; margin: 0 auto; }
.section-block.section-dark { background: var(--text-primary); color: var(--bg-primary); max-width: 100%; }
.section-header-center { text-align: center; margin-bottom: 4rem; }
.section-header-flex { display: flex; justify-content: space-between; align-items: end; margin-bottom: 3rem; flex-wrap: wrap; gap: 1rem; }
.section-label { display: inline-block; font-size: 0.8rem; font-weight: 600; letter-spacing: 2px; color: var(--accent); margin-bottom: 1rem; }
.section-title-lg { font-family: 'Playfair Display', serif; font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 1rem; }
.section-sub { color: var(--text-secondary); font-size: 1.05rem; max-width: 700px; margin: 0 auto; }
.section-link { color: var(--accent); text-decoration: none; font-weight: 500; font-size: 0.95rem; display: inline-flex; align-items: center; gap: 0.3rem; transition: gap var(--transition); }
.section-link:hover { gap: 0.6rem; color: var(--accent); }

/* ========== 优势 ========== */
.advantages-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; }
@media (max-width: 991px) { .advantages-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 576px) { .advantages-grid { grid-template-columns: 1fr; } }
.adv-card { padding: 2rem; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 24px; transition: all var(--transition); }
.adv-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.adv-icon { width: 56px; height: 56px; border-radius: 16px; display: flex; align-items: center; justify-content: center; color: white; font-size: 1.6rem; margin-bottom: 1.5rem; }
.adv-card h3 { font-family: 'Playfair Display', serif; font-size: 1.35rem; font-weight: 700; margin-bottom: 0.8rem; }
.adv-card p { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.7; margin: 0; }

/* ========== 产品矩阵 ========== */
.product-matrix { display: grid; grid-template-columns: 2fr 1fr 1fr; grid-template-rows: 1fr 1fr; gap: 1.5rem; }
@media (max-width: 991px) { .product-matrix { grid-template-columns: 1fr 1fr; grid-template-rows: auto; } }
@media (max-width: 576px) { .product-matrix { grid-template-columns: 1fr; } }
.matrix-card { padding: 2rem; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 24px; transition: all var(--transition); display: flex; flex-direction: column; }
.matrix-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--accent); }
.matrix-hero { grid-row: span 2; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; border: none; }
@media (max-width: 991px) { .matrix-hero { grid-row: span 1; grid-column: span 2; } }
@media (max-width: 576px) { .matrix-hero { grid-column: span 1; } }
.matrix-hero:hover { transform: translateY(-4px); }
.matrix-tag { display: inline-block; padding: 0.3rem 0.8rem; background: rgba(255,255,255,0.2); border-radius: 20px; font-size: 0.75rem; font-weight: 600; margin-bottom: 1rem; align-self: flex-start; }
.matrix-icon { width: 48px; height: 48px; border-radius: 12px; background: var(--bg-tertiary); display: flex; align-items: center; justify-content: center; color: var(--accent); font-size: 1.4rem; margin-bottom: 1rem; }
.matrix-card h3 { font-family: 'Playfair Display', serif; font-size: 1.4rem; font-weight: 700; margin-bottom: 0.8rem; }
.matrix-hero h3 { font-size: 2rem; }
.matrix-card p { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.6; margin-bottom: 1.5rem; flex: 1; }
.matrix-hero p { color: rgba(255,255,255,0.85); font-size: 1.05rem; }
.matrix-features { display: flex; flex-direction: column; gap: 0.5rem; margin-bottom: 1.5rem; }
.matrix-features span { font-size: 0.9rem; opacity: 0.9; }
.matrix-features i { color: #4facfe; margin-right: 0.5rem; }
.matrix-link { color: inherit; text-decoration: none; font-weight: 600; font-size: 0.9rem; transition: gap var(--transition); }
.matrix-link:hover { color: inherit; opacity: 0.8; }

/* ========== 解决方案 ========== */
.solutions-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
@media (max-width: 991px) { .solutions-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 576px) { .solutions-grid { grid-template-columns: 1fr; } }
.solution-card { padding: 2rem; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 20px; transition: all var(--transition); text-decoration: none; color: inherit; display: block; }
.solution-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); color: inherit; border-color: transparent; }
.sol-icon { width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin-bottom: 1.2rem; }
.solution-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.6rem; line-height: 1.4; }
.solution-card p { color: var(--text-secondary); font-size: 0.88rem; line-height: 1.6; margin-bottom: 1rem; min-height: 3rem; }
.sol-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.mini-tag { padding: 0.25rem 0.7rem; background: var(--bg-tertiary); border-radius: 12px; font-size: 0.72rem; color: var(--text-secondary); }
.mini-tag-sm { padding: 0.2rem 0.5rem; background: var(--bg-tertiary); border-radius: 8px; font-size: 0.68rem; color: var(--text-tertiary); }

/* ========== 数据展示 ========== */
.data-showcase { display: grid; grid-template-columns: repeat(5, 1fr); gap: 2rem; max-width: 1400px; margin: 0 auto; padding: 4rem 2rem; }
@media (max-width: 991px) { .data-showcase { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 576px) { .data-showcase { grid-template-columns: repeat(2, 1fr); } }
.data-item { text-align: center; padding: 1rem; }
.data-num { font-family: 'Playfair Display', serif; font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; background: linear-gradient(135deg, #667eea, #f093fb); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 0.5rem; }
.data-label { color: rgba(255,255,255,0.7); font-size: 0.9rem; }

/* ========== 认证 ========== */
.cert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; max-width: 1200px; margin: 0 auto; }
@media (max-width: 768px) { .cert-grid { grid-template-columns: repeat(2, 1fr); } }
.cert-item { display: flex; align-items: center; gap: 0.8rem; padding: 1.2rem 1.5rem; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 16px; transition: all var(--transition); }
.cert-item:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: var(--accent); }
.cert-item i { font-size: 1.5rem; color: var(--accent); }
.cert-item span { font-size: 0.92rem; font-weight: 500; }

/* ========== CTA ========== */
.cta-section { max-width: 1400px; margin: 4rem auto; padding: 4rem 2rem; }
.cta-inner { background: var(--gradient-1); border-radius: 32px; padding: 4rem 2rem; text-align: center; color: white; }
.cta-inner h2 { font-family: 'Playfair Display', serif; font-size: clamp(1.8rem, 4vw, 2.5rem); font-weight: 700; margin-bottom: 1rem; }
.cta-inner p { font-size: 1.1rem; opacity: 0.9; margin-bottom: 2rem; }
.cta-btns { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.cta-inner .btn-primary-lg { background: white; color: #667eea; }
.cta-inner .btn-primary-lg:hover { color: #667eea; }
.cta-inner .btn-outline-lg { border-color: rgba(255,255,255,0.4); color: white; }
.cta-inner .btn-outline-lg:hover { background: rgba(255,255,255,0.1); border-color: white; color: white; }

/* ========== Page Hero ========== */
.page-hero { padding: 130px 2rem 4rem; background: var(--bg-secondary); border-bottom: 1px solid var(--border-color); position: relative; overflow: hidden; }
.page-hero::before { content: ''; position: absolute; top: 0; right: -10%; width: 500px; height: 500px; background: var(--gradient-1); opacity: 0.06; border-radius: 50%; filter: blur(80px); }
.page-hero-inner { max-width: 1400px; margin: 0 auto; position: relative; z-index: 1; }
.breadcrumb-nav { display: flex; align-items: center; gap: 0.5rem; color: var(--text-tertiary); font-size: 0.9rem; margin-bottom: 1.5rem; }
.breadcrumb-nav a { color: var(--text-tertiary); text-decoration: none; transition: color var(--transition); }
.breadcrumb-nav a:hover { color: var(--accent); }
.page-title { font-family: 'Playfair Display', serif; font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 1rem; }
.page-desc { font-size: 1.1rem; color: var(--text-secondary); max-width: 700px; line-height: 1.7; }

/* Main Content */
.main-content { max-width: 1400px; margin: 0 auto; padding: 3rem 2rem; }

/* ========== 产品筛选 ========== */
.filter-bar { padding: 2rem; background: var(--bg-primary); border-bottom: 1px solid var(--border-color); position: sticky; top: 60px; z-index: 100; }
.filter-inner { max-width: 1400px; margin: 0 auto; display: flex; gap: 0.6rem; overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
.filter-inner::-webkit-scrollbar { display: none; }
.filter-pill { padding: 0.6rem 1.4rem; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 30px; font-size: 0.9rem; font-weight: 500; color: var(--text-secondary); cursor: pointer; transition: all var(--transition); white-space: nowrap; }
.filter-pill:hover { border-color: var(--text-primary); color: var(--text-primary); }
.filter-pill.active { background: var(--text-primary); color: var(--bg-primary); border-color: var(--text-primary); }

/* ========== 产品卡片 ========== */
.product-cat-header { display: flex; justify-content: space-between; align-items: end; margin-bottom: 3rem; gap: 2rem; flex-wrap: wrap; padding-top: 2rem; }
.cat-eyebrow { display: block; font-size: 0.8rem; font-weight: 600; letter-spacing: 2px; color: var(--accent); margin-bottom: 0.5rem; }
.cat-title { font-family: 'Playfair Display', serif; font-size: clamp(1.8rem, 3vw, 2.5rem); font-weight: 700; margin-bottom: 0.8rem; }
.cat-desc { color: var(--text-secondary); font-size: 1rem; max-width: 700px; line-height: 1.6; }
.cat-badge { padding: 0.6rem 1.2rem; background: var(--gradient-1); color: white; border-radius: 30px; font-weight: 600; font-size: 0.9rem; }

.products-grid-v2 { display: grid; grid-template-columns: 1fr; gap: 2rem; margin-bottom: 4rem; }
.product-entry-card { background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 24px; padding: 2rem; transition: all var(--transition); }
.product-entry-card:hover { box-shadow: var(--shadow-md); }
.pec-header { display: flex; gap: 1.2rem; margin-bottom: 1.2rem; align-items: flex-start; }
.pec-icon { width: 52px; height: 52px; border-radius: 14px; background: var(--gradient-1); display: flex; align-items: center; justify-content: center; color: white; font-size: 1.4rem; flex-shrink: 0; }
.pec-title { font-family: 'Playfair Display', serif; font-size: 1.5rem; font-weight: 700; margin-bottom: 0.6rem; }
.pec-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.pec-body p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; margin-bottom: 1rem; }
.pec-details { margin-top: 1rem; }
.pec-details summary { cursor: pointer; color: var(--accent); font-weight: 500; font-size: 0.9rem; display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.5rem 0; list-style: none; }
.pec-details summary::-webkit-details-marker { display: none; }
.pec-details[open] summary i { transform: rotate(180deg); }
.pec-details summary i { transition: transform var(--transition); }
.pec-full-content { padding: 1.5rem; background: var(--bg-tertiary); border-radius: 16px; margin-top: 1rem; color: var(--text-secondary); font-size: 0.9rem; line-height: 1.8; white-space: pre-wrap; }
.pec-refs { margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--border-color); }
.pec-refs h4 { font-size: 0.85rem; font-weight: 600; color: var(--text-tertiary); margin-bottom: 0.8rem; display: flex; align-items: center; gap: 0.4rem; text-transform: uppercase; letter-spacing: 1px; }
.refs-list { display: flex; flex-direction: column; gap: 0.4rem; }
.ref-link { display: flex; align-items: center; gap: 0.6rem; padding: 0.7rem 1rem; background: var(--bg-tertiary); border-radius: 10px; color: var(--text-primary); text-decoration: none; font-size: 0.88rem; transition: all var(--transition); }
.ref-link:hover { background: var(--accent); color: white; transform: translateX(4px); }
.ref-link i { color: #ff3b30; font-size: 1rem; }
.ref-link:hover i { color: white; }

/* ========== 解决方案页 ========== */
.solutions-index { margin-bottom: 4rem; }
.index-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
@media (max-width: 991px) { .index-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 576px) { .index-grid { grid-template-columns: repeat(2, 1fr); } }
.index-item { display: flex; align-items: center; gap: 0.8rem; padding: 1rem 1.2rem; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 14px; text-decoration: none; color: var(--text-primary); font-size: 0.9rem; font-weight: 500; transition: all var(--transition); }
.index-item:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); color: var(--text-primary); border-color: var(--accent); }
.index-icon { width: 36px; height: 36px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1.1rem; flex-shrink: 0; }
.index-name { flex: 1; line-height: 1.3; }

.solution-detail { background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 32px; padding: 3rem; margin-bottom: 3rem; }
.sd-header { display: flex; gap: 2rem; margin-bottom: 2rem; padding-bottom: 2rem; border-bottom: 1px solid var(--border-color); flex-wrap: wrap; }
.sd-icon-lg { width: 88px; height: 88px; border-radius: 24px; display: flex; align-items: center; justify-content: center; color: white; font-size: 2.5rem; flex-shrink: 0; }
.sd-header-text { flex: 1; }
.sd-number { display: block; font-size: 0.8rem; font-weight: 600; letter-spacing: 2px; color: var(--accent); margin-bottom: 0.5rem; }
.sd-header-text h2 { font-family: 'Playfair Display', serif; font-size: 1.8rem; font-weight: 700; margin-bottom: 0.6rem; }
.sd-tagline { color: var(--text-secondary); font-size: 1rem; margin-bottom: 1rem; }
.sd-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.sd-content { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.9; white-space: pre-wrap; }

/* ========== FAQ ========== */
.kb-stats { display: flex; gap: 2rem; margin-top: 2rem; flex-wrap: wrap; }
.kb-stat { display: flex; flex-direction: column; align-items: flex-start; }
.kb-stat .num { font-family: 'Playfair Display', serif; font-size: 2rem; font-weight: 700; background: var(--gradient-1); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.kb-stat span:last-child { color: var(--text-tertiary); font-size: 0.85rem; }

.faq-nav-section { margin-bottom: 3rem; position: sticky; top: 80px; z-index: 50; }
.faq-nav { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; background: var(--bg-glass); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); padding: 1rem; border-radius: 20px; border: 1px solid var(--border-color); }
@media (max-width: 991px) { .faq-nav { grid-template-columns: repeat(2, 1fr); } }
.faq-nav-item { display: flex; align-items: center; gap: 0.6rem; padding: 0.8rem 1rem; background: var(--bg-secondary); border-radius: 12px; text-decoration: none; color: var(--text-primary); font-size: 0.88rem; font-weight: 500; transition: all var(--transition); border: 1px solid transparent; }
.faq-nav-item:hover { color: var(--accent); border-color: var(--accent); }
.faq-nav-item i { font-size: 1.1rem; color: var(--accent); }
.faq-nav-item em { margin-left: auto; font-style: normal; padding: 0.2rem 0.6rem; background: var(--bg-tertiary); border-radius: 10px; font-size: 0.75rem; color: var(--text-tertiary); }

.faq-cat-section { margin-bottom: 4rem; scroll-margin-top: 200px; }
.faq-cat-header { display: flex; align-items: center; gap: 1.5rem; margin-bottom: 2rem; }
.faq-cat-icon { width: 60px; height: 60px; border-radius: 18px; background: var(--gradient-1); display: flex; align-items: center; justify-content: center; color: white; font-size: 1.6rem; }
.faq-cat-eyebrow { display: block; font-size: 0.75rem; font-weight: 600; letter-spacing: 2px; color: var(--accent); margin-bottom: 0.3rem; }
.faq-cat-title { font-family: 'Playfair Display', serif; font-size: 2rem; font-weight: 700; margin: 0; }

.faq-list { display: flex; flex-direction: column; gap: 0.8rem; }
.faq-item { background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 20px; overflow: hidden; transition: all var(--transition); }
.faq-item:hover { border-color: var(--accent); }
.faq-item[open] { box-shadow: var(--shadow-md); }
.faq-question { display: flex; align-items: flex-start; gap: 1rem; padding: 1.5rem 2rem; cursor: pointer; list-style: none; font-weight: 600; font-size: 1.05rem; line-height: 1.5; user-select: none; }
.faq-question::-webkit-details-marker { display: none; }
.q-marker { width: 28px; height: 28px; border-radius: 8px; background: var(--gradient-1); color: white; display: flex; align-items: center; justify-content: center; font-family: 'Playfair Display', serif; font-weight: 700; font-size: 0.9rem; flex-shrink: 0; margin-top: 0.1rem; }
.q-text { flex: 1; }
.toggle-icon { color: var(--text-tertiary); font-size: 1.2rem; transition: transform var(--transition); margin-top: 0.2rem; }
.faq-item[open] .toggle-icon { transform: rotate(45deg); color: var(--accent); }
.faq-answer { padding: 0 2rem 1.8rem 2rem; display: flex; gap: 1rem; align-items: flex-start; }
.a-marker { width: 28px; height: 28px; border-radius: 8px; background: var(--bg-tertiary); color: var(--accent); display: flex; align-items: center; justify-content: center; font-family: 'Playfair Display', serif; font-weight: 700; font-size: 0.9rem; flex-shrink: 0; }
.a-text { flex: 1; color: var(--text-secondary); line-height: 1.8; font-size: 0.95rem; padding-top: 0.2rem; }

/* ========== 资料下载 ========== */
.download-search { margin-bottom: 3rem; }
.dl-search-box { display: flex; align-items: center; gap: 1rem; padding: 1rem 1.5rem; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 20px; box-shadow: var(--shadow-sm); }
.dl-search-box i.bi-search { font-size: 1.3rem; color: var(--text-tertiary); }
.dl-search-box input { flex: 1; border: none; background: transparent; outline: none; font-size: 1rem; color: var(--text-primary); }
.dl-count { color: var(--text-tertiary); font-size: 0.85rem; white-space: nowrap; }
.dl-count span { color: var(--accent); font-weight: 700; }

.link-section { margin-bottom: 4rem; }
.link-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; margin-top: 2rem; }
@media (max-width: 768px) { .link-grid { grid-template-columns: 1fr; } }
.link-card { display: flex; align-items: flex-start; gap: 1rem; padding: 1.5rem; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 18px; text-decoration: none; color: var(--text-primary); transition: all var(--transition); position: relative; }
.link-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--accent); color: var(--text-primary); }
.link-icon { width: 44px; height: 44px; border-radius: 12px; background: var(--gradient-3); color: white; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; flex-shrink: 0; }
.link-body { flex: 1; min-width: 0; }
.link-name { font-weight: 600; font-size: 0.98rem; margin-bottom: 0.4rem; line-height: 1.4; }
.link-note { color: var(--text-secondary); font-size: 0.85rem; line-height: 1.5; margin-bottom: 0.6rem; }
.link-tags { display: flex; flex-wrap: wrap; gap: 0.3rem; }
.link-arrow { color: var(--text-tertiary); position: absolute; top: 1.5rem; right: 1.5rem; opacity: 0.5; transition: all var(--transition); }
.link-card:hover .link-arrow { opacity: 1; color: var(--accent); transform: translate(3px, -3px); }

.download-section { margin-top: 3rem; }
.dl-cat-block { margin-bottom: 3rem; }
.dl-cat-title { font-family: 'Playfair Display', serif; font-size: 1.4rem; font-weight: 700; margin-bottom: 1.5rem; display: flex; align-items: center; gap: 0.8rem; padding-bottom: 1rem; border-bottom: 1px solid var(--border-color); }
.dl-cat-title i { color: var(--accent); }
.dl-cat-count { margin-left: auto; padding: 0.3rem 0.8rem; background: var(--bg-tertiary); color: var(--text-secondary); border-radius: 12px; font-size: 0.8rem; font-weight: 500; }
.dl-file-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.8rem; }
@media (max-width: 768px) { .dl-file-grid { grid-template-columns: 1fr; } }
.dl-file-card { display: flex; align-items: center; gap: 1rem; padding: 1rem 1.2rem; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 14px; text-decoration: none; color: var(--text-primary); transition: all var(--transition); }
.dl-file-card:hover { border-color: var(--accent); background: var(--bg-tertiary); color: var(--text-primary); transform: translateX(4px); }
.dl-file-icon { width: 40px; height: 40px; border-radius: 10px; background: rgba(255, 59, 48, 0.1); color: #ff3b30; display: flex; align-items: center; justify-content: center; font-size: 1.3rem; flex-shrink: 0; }
.dl-file-body { flex: 1; min-width: 0; }
.dl-file-name { font-weight: 500; font-size: 0.9rem; line-height: 1.4; margin-bottom: 0.3rem; }
.dl-file-tags { display: flex; flex-wrap: wrap; gap: 0.25rem; }
.dl-icon { color: var(--text-tertiary); font-size: 1.1rem; transition: all var(--transition); }
.dl-file-card:hover .dl-icon { color: var(--accent); transform: translateY(2px); }

/* ========== 关于我们 ========== */
.about-block { margin-bottom: 5rem; }
.about-header { margin-bottom: 2.5rem; }
.about-eyebrow { display: block; font-size: 0.8rem; font-weight: 600; letter-spacing: 2px; color: var(--accent); margin-bottom: 0.8rem; }
.about-title { font-family: 'Playfair Display', serif; font-size: clamp(1.8rem, 3vw, 2.5rem); font-weight: 700; letter-spacing: -0.02em; }
.about-content { background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 24px; padding: 3rem; color: var(--text-secondary); font-size: 0.98rem; line-height: 1.9; white-space: pre-wrap; }
@media (max-width: 768px) { .about-content { padding: 2rem 1.5rem; } }

/* 服务卡片 */
.services-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
@media (max-width: 768px) { .services-grid { grid-template-columns: 1fr; } }
.service-card { padding: 2.5rem; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 24px; transition: all var(--transition); }
.service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.service-icon { width: 60px; height: 60px; border-radius: 16px; background: var(--gradient-1); color: white; display: flex; align-items: center; justify-content: center; font-size: 1.6rem; margin-bottom: 1.5rem; }
.service-card h3 { font-family: 'Playfair Display', serif; font-size: 1.4rem; font-weight: 700; margin-bottom: 1rem; }
.service-card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.8; margin: 0; white-space: pre-wrap; }

/* 联系卡片 */
.contact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
@media (max-width: 991px) { .contact-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 576px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-card { padding: 2rem; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 20px; text-align: center; transition: all var(--transition); }
.contact-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--accent); }
.contact-icon { width: 56px; height: 56px; border-radius: 50%; background: var(--gradient-1); color: white; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin: 0 auto 1.2rem; }
.contact-card h3 { font-family: 'Playfair Display', serif; font-size: 1.2rem; font-weight: 700; margin-bottom: 0.8rem; }
.contact-value { display: block; font-size: 1rem; font-weight: 600; color: var(--accent); margin-bottom: 0.5rem; text-decoration: none; word-break: break-all; }
.contact-value:hover { color: var(--accent-hover); }
.contact-card p { color: var(--text-tertiary); font-size: 0.85rem; margin: 0; }

/* ========== Footer ========== */
.footer { background: var(--bg-secondary); border-top: 1px solid var(--border-color); padding: 4rem 2rem 2rem; margin-top: 4rem; }
.footer-grid { max-width: 1400px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 3rem; margin-bottom: 3rem; }
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }

.footer-brand h3 { font-family: 'Playfair Display', serif; font-size: 1.8rem; font-weight: 700; margin-bottom: 0.75rem; }
.footer-brand h3 .text-muted { color: var(--text-tertiary) !important; font-size: 1.2rem; font-weight: 400; }
.footer-brand p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; max-width: 380px; margin-bottom: 1.5rem; }
.footer-badges { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.badge-item { display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.4rem 0.8rem; background: var(--bg-tertiary); color: var(--text-secondary); border-radius: 12px; font-size: 0.78rem; }
.badge-item i { color: var(--accent); }

.footer-col h4 { font-size: 0.85rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 1rem; color: var(--text-primary); }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 0.6rem; }
.footer-col a { color: var(--text-secondary); text-decoration: none; font-size: 0.9rem; transition: all var(--transition); display: inline-flex; align-items: center; }
.footer-col a:hover { color: var(--accent); padding-left: 4px; }

.footer-bottom { max-width: 1400px; margin: 0 auto; padding-top: 2rem; border-top: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
.footer-bottom p { color: var(--text-tertiary); font-size: 0.85rem; margin: 0; }

/* ========== Toast ========== */
.toast-msg { position: fixed; top: 100px; left: 50%; transform: translateX(-50%) translateY(-100px); background: var(--text-primary); color: var(--bg-primary); padding: 1rem 1.8rem; border-radius: 30px; font-weight: 500; box-shadow: var(--shadow-lg); opacity: 0; transition: all var(--transition); z-index: -1; display: flex; align-items: center; gap: 0.5rem; }
.toast-msg.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ========== 动画 ========== */
.fade-up { opacity: 0; transform: translateY(30px); transition: opacity 0.8s var(--easing), transform 0.8s var(--easing); }
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-in { opacity: 0; transition: opacity 0.8s var(--easing); }
.fade-in.visible { opacity: 1; }

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .section-block { padding: 4rem 1.5rem; }
  .main-content { padding: 2rem 1rem; }
  .page-hero { padding: 110px 1.5rem 3rem; }
  .filter-bar { padding: 1rem; top: 55px; }
  .cta-inner { padding: 3rem 1.5rem; }
  .solution-detail { padding: 2rem 1.5rem; }
  .sd-header { gap: 1rem; }
  .sd-icon-lg { width: 64px; height: 64px; font-size: 1.8rem; border-radius: 18px; }
  .faq-question { padding: 1.2rem 1.5rem; font-size: 0.98rem; }
  .faq-answer { padding: 0 1.5rem 1.5rem 1.5rem; }
  .contact-card { padding: 1.5rem; }
  .product-entry-card { padding: 1.5rem; }
  .pec-header { gap: 0.8rem; }
  .pec-icon { width: 42px; height: 42px; font-size: 1.1rem; border-radius: 12px; }
  .pec-title { font-size: 1.2rem; }
  .faq-cat-header { gap: 1rem; }
  .faq-cat-icon { width: 48px; height: 48px; font-size: 1.3rem; border-radius: 14px; }
  .faq-cat-title { font-size: 1.5rem; }
  .hero-home { padding: 100px 1.5rem 3rem; }
  .hero-cta { flex-direction: column; }
  .btn-primary-lg, .btn-outline-lg { justify-content: center; }
}

/* ========== Dark Mode Adjustments ========== */
[data-bs-theme="dark"] .dl-file-icon { background: rgba(255, 59, 48, 0.15); }
[data-bs-theme="dark"] .hero-bg-grid { opacity: 0.3; }
[data-bs-theme="dark"] .matrix-hero { background: linear-gradient(135deg, #4a3a8e 0%, #5a3e78 100%); }