/* ============================================
   瀚腾塑料包装 - 主样式表
   ============================================ */
@import url('./variables.css');

/* === 基础重置 === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { font-family: var(--font-body); color: var(--color-text); line-height: var(--leading-normal); background: var(--color-bg); overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: color var(--transition-base); }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
ul, ol { list-style: none; }
h1,h2,h3,h4,h5,h6 { font-family: var(--font-display); line-height: var(--leading-tight); font-weight: var(--font-bold); }

/* === 工具类 === */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--container-padding); }
.container-wide { max-width: var(--container-wide); margin: 0 auto; padding: 0 var(--container-padding); }
.container-narrow { max-width: var(--container-narrow); margin: 0 auto; padding: 0 var(--container-padding); }

.section { padding: var(--space-section) 0; position: relative; }
.section-dark { background: var(--color-bg-dark); color: var(--color-text-white); }
.section-gray { background: var(--color-bg-section); }

.section-header { text-align: center; margin-bottom: var(--space-16); }
.section-header .label { display: inline-block; font-size: var(--text-sm); font-weight: var(--font-semibold); color: var(--color-accent); text-transform: uppercase; letter-spacing: 3px; margin-bottom: var(--space-4); }
.section-header h2 { font-size: var(--text-4xl); margin-bottom: var(--space-4); }
.section-header p { font-size: var(--text-lg); color: var(--color-text-light); max-width: 600px; margin: 0 auto; }
.section-dark .section-header p { color: var(--color-gray-400); }
.section-header .line { width: 60px; height: 3px; background: var(--gradient-accent); margin: var(--space-6) auto 0; border-radius: 2px; }

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

.btn { display: inline-flex; align-items: center; gap: var(--space-2); padding: var(--space-3) var(--space-8); border-radius: var(--radius-full); font-weight: var(--font-semibold); font-size: var(--text-base); transition: all var(--transition-base); position: relative; overflow: hidden; }
.btn-primary { background: var(--gradient-accent); color: var(--color-primary); box-shadow: var(--shadow-glow); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-glow-lg); }
.btn-outline { border: 2px solid var(--color-accent); color: var(--color-accent); background: transparent; }
.btn-outline:hover { background: var(--color-accent); color: var(--color-primary); }
.btn-white { background: var(--color-white); color: var(--color-primary); box-shadow: var(--shadow-lg); }
.btn-white:hover { transform: translateY(-2px); box-shadow: var(--shadow-xl); }
.btn-lg { padding: var(--space-4) var(--space-10); font-size: var(--text-lg); }
.btn-sm { padding: var(--space-2) var(--space-6); font-size: var(--text-sm); }

.grid { display: grid; gap: var(--space-8); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1024px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* === 导航栏 === */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: var(--z-sticky); padding: var(--space-4) 0; transition: all var(--transition-base); }
.navbar.scrolled { background: rgba(10, 22, 40, 0.95); backdrop-filter: var(--glass-blur); padding: var(--space-3) 0; box-shadow: 0 4px 30px rgba(0,0,0,0.2); }
.navbar .container { display: flex; align-items: center; justify-content: space-between; }
.navbar-brand { display: flex; align-items: center; gap: var(--space-3); }
.navbar-brand .logo-icon { width: 44px; height: 44px; background: var(--gradient-accent); border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; font-weight: var(--font-black); font-size: var(--text-xl); color: var(--color-primary); }
.navbar-brand .brand-text { display: flex; flex-direction: column; }
.navbar-brand .brand-name { font-size: var(--text-lg); font-weight: var(--font-bold); color: var(--color-white); letter-spacing: 1px; }
.navbar-brand .brand-sub { font-size: var(--text-xs); color: var(--color-gray-400); letter-spacing: 2px; }
.navbar-menu { display: flex; align-items: center; gap: var(--space-1); }
.navbar-menu a { padding: var(--space-2) var(--space-4); color: var(--color-gray-300); font-size: var(--text-sm); font-weight: var(--font-medium); border-radius: var(--radius-md); transition: all var(--transition-base); position: relative; }
.navbar-menu a:hover, .navbar-menu a.active { color: var(--color-white); }
.navbar-menu a::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 0; height: 2px; background: var(--color-accent); transition: width var(--transition-base); border-radius: 1px; }
.navbar-menu a:hover::after, .navbar-menu a.active::after { width: 60%; }
.navbar-cta .btn { font-size: var(--text-sm); }
.navbar-toggle { display: none; flex-direction: column; gap: 5px; padding: var(--space-2); }
.navbar-toggle span { display: block; width: 24px; height: 2px; background: var(--color-white); border-radius: 1px; transition: all var(--transition-base); }
@media (max-width: 1024px) {
  .navbar-toggle { display: flex; }
  .navbar-menu { position: fixed; top: 0; right: -100%; width: 300px; height: 100vh; background: rgba(10, 22, 40, 0.98); backdrop-filter: var(--glass-blur); flex-direction: column; padding: var(--space-20) var(--space-8); gap: var(--space-2); transition: right var(--transition-slow); box-shadow: -10px 0 30px rgba(0,0,0,0.3); }
  .navbar-menu.open { right: 0; }
  .navbar-menu a { font-size: var(--text-lg); padding: var(--space-3) var(--space-4); width: 100%; }
  .navbar-cta { display: none; }
}

/* === Hero 区域 === */
.hero { min-height: 100vh; display: flex; align-items: center; position: relative; background: var(--gradient-hero); overflow: hidden; }
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-bg canvas { width: 100%; height: 100%; }
.hero-bg .overlay { position: absolute; inset: 0; background: radial-gradient(ellipse at 30% 50%, rgba(200, 164, 92, 0.08) 0%, transparent 60%); }
.hero-content { position: relative; z-index: 2; max-width: 800px; }
.hero-label { display: inline-flex; align-items: center; gap: var(--space-2); background: var(--glass-bg); border: 1px solid var(--glass-border); backdrop-filter: var(--glass-blur); padding: var(--space-2) var(--space-5); border-radius: var(--radius-full); font-size: var(--text-sm); color: var(--color-accent-light); margin-bottom: var(--space-8); }
.hero-label .dot { width: 8px; height: 8px; background: var(--color-accent); border-radius: 50%; animation: pulse 2s infinite; }
.hero h1 { font-size: var(--text-7xl); font-weight: var(--font-black); color: var(--color-white); margin-bottom: var(--space-6); line-height: 1.15; }
.hero h1 .highlight { position: relative; display: inline-block; }
.hero h1 .highlight::after { content: ''; position: absolute; bottom: 4px; left: 0; right: 0; height: 12px; background: var(--color-accent); opacity: 0.3; z-index: -1; border-radius: 2px; }
.hero-description { font-size: var(--text-xl); color: var(--color-gray-400); margin-bottom: var(--space-10); max-width: 600px; line-height: var(--leading-relaxed); }
.hero-buttons { display: flex; gap: var(--space-4); flex-wrap: wrap; }
.hero-stats { display: flex; gap: var(--space-12); margin-top: var(--space-16); padding-top: var(--space-8); border-top: 1px solid rgba(255,255,255,0.1); }
.hero-stat .number { font-size: var(--text-4xl); font-weight: var(--font-black); color: var(--color-accent); }
.hero-stat .number span { font-size: var(--text-lg); font-weight: var(--font-normal); }
.hero-stat .label { font-size: var(--text-sm); color: var(--color-gray-400); margin-top: var(--space-1); }
.hero-visual { position: absolute; right: -5%; top: 50%; transform: translateY(-50%); width: 50%; height: 80%; z-index: 1; pointer-events: none; }
.hero-visual .floating-card { position: absolute; background: var(--glass-bg); border: 1px solid var(--glass-border); backdrop-filter: var(--glass-blur); border-radius: var(--radius-xl); padding: var(--space-6); animation: float 6s ease-in-out infinite; }
.hero-visual .card-1 { top: 10%; right: 10%; width: 200px; animation-delay: 0s; }
.hero-visual .card-2 { bottom: 20%; right: 25%; width: 180px; animation-delay: 2s; }
.hero-visual .card-3 { top: 40%; right: 5%; width: 160px; animation-delay: 4s; }
.hero-scroll { position: absolute; bottom: var(--space-8); left: 50%; transform: translateX(-50%); z-index: 2; display: flex; flex-direction: column; align-items: center; gap: var(--space-2); color: var(--color-gray-400); font-size: var(--text-sm); }
.hero-scroll .mouse { width: 24px; height: 36px; border: 2px solid var(--color-gray-500); border-radius: 12px; position: relative; }
.hero-scroll .mouse::after { content: ''; position: absolute; top: 6px; left: 50%; transform: translateX(-50%); width: 3px; height: 8px; background: var(--color-accent); border-radius: 2px; animation: scrollDown 2s infinite; }

/* === 优势模块 === */
.advantages { background: var(--color-bg-dark); position: relative; }
.advantages::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px; background: linear-gradient(90deg, transparent, var(--color-accent), transparent); }
.advantage-card { background: var(--gradient-glass); border: 1px solid var(--glass-border); border-radius: var(--radius-xl); padding: var(--space-8); transition: all var(--transition-base); position: relative; overflow: hidden; }
.advantage-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--gradient-accent); transform: scaleX(0); transition: transform var(--transition-base); }
.advantage-card:hover { transform: translateY(-4px); border-color: var(--color-accent); }
.advantage-card:hover::before { transform: scaleX(1); }
.advantage-icon { width: 56px; height: 56px; background: rgba(200, 164, 92, 0.1); border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; margin-bottom: var(--space-5); font-size: var(--text-2xl); }
.advantage-card h3 { font-size: var(--text-xl); color: var(--color-white); margin-bottom: var(--space-3); }
.advantage-card p { font-size: var(--text-sm); color: var(--color-gray-400); line-height: var(--leading-relaxed); }

/* === 产品卡片 === */
.product-card { background: var(--color-white); border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-card); transition: all var(--transition-base); border: 1px solid var(--color-gray-100); }
.product-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-card-hover); }
.product-card .image { position: relative; height: 240px; overflow: hidden; background: var(--color-gray-100); }
.product-card .image img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition-slow); }
.product-card:hover .image img { transform: scale(1.08); }
.product-card .image .badge { position: absolute; top: var(--space-3); left: var(--space-3); background: var(--color-accent); color: var(--color-primary); font-size: var(--text-xs); font-weight: var(--font-bold); padding: var(--space-1) var(--space-3); border-radius: var(--radius-full); }
.product-card .body { padding: var(--space-6); }
.product-card .category { font-size: var(--text-xs); color: var(--color-accent); font-weight: var(--font-semibold); text-transform: uppercase; letter-spacing: 1px; margin-bottom: var(--space-2); }
.product-card h3 { font-size: var(--text-lg); margin-bottom: var(--space-2); color: var(--color-gray-800); }
.product-card .desc { font-size: var(--text-sm); color: var(--color-text-light); line-height: var(--leading-relaxed); margin-bottom: var(--space-4); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.product-card .tags { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-4); }
.product-card .tag { font-size: var(--text-xs); padding: var(--space-1) var(--space-3); background: var(--color-gray-100); color: var(--color-gray-600); border-radius: var(--radius-full); }
.product-card .link { display: inline-flex; align-items: center; gap: var(--space-2); font-size: var(--text-sm); font-weight: var(--font-semibold); color: var(--color-accent); }
.product-card .link svg { transition: transform var(--transition-base); }
.product-card:hover .link svg { transform: translateX(4px); }

/* === 案例卡片 === */
.case-card { position: relative; border-radius: var(--radius-xl); overflow: hidden; height: 360px; cursor: pointer; }
.case-card .image { position: absolute; inset: 0; }
.case-card .image img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition-slow); }
.case-card:hover .image img { transform: scale(1.08); }
.case-card .overlay { position: absolute; inset: 0; background: linear-gradient(180deg, transparent 30%, rgba(10, 22, 40, 0.9) 100%); transition: background var(--transition-base); }
.case-card:hover .overlay { background: linear-gradient(180deg, transparent 10%, rgba(10, 22, 40, 0.95) 100%); }
.case-card .content { position: absolute; bottom: 0; left: 0; right: 0; padding: var(--space-8); transform: translateY(20px); transition: transform var(--transition-base); }
.case-card:hover .content { transform: translateY(0); }
.case-card .tag { display: inline-block; font-size: var(--text-xs); color: var(--color-accent); font-weight: var(--font-semibold); margin-bottom: var(--space-2); letter-spacing: 1px; }
.case-card h3 { font-size: var(--text-xl); color: var(--color-white); margin-bottom: var(--space-2); }
.case-card p { font-size: var(--text-sm); color: var(--color-gray-300); opacity: 0; transition: opacity var(--transition-base); }
.case-card:hover p { opacity: 1; }

/* === 新闻卡片 === */
.news-card { background: var(--color-white); border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-card); transition: all var(--transition-base); border: 1px solid var(--color-gray-100); }
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card-hover); }
.news-card .image { height: 200px; overflow: hidden; background: var(--color-gray-100); }
.news-card .image img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition-slow); }
.news-card:hover .image img { transform: scale(1.06); }
.news-card .body { padding: var(--space-6); }
.news-card .meta { display: flex; align-items: center; gap: var(--space-4); font-size: var(--text-xs); color: var(--color-text-light); margin-bottom: var(--space-3); }
.news-card .meta .category { color: var(--color-accent); font-weight: var(--font-semibold); }
.news-card h3 { font-size: var(--text-lg); margin-bottom: var(--space-3); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card p { font-size: var(--text-sm); color: var(--color-text-light); line-height: var(--leading-relaxed); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

/* === 合作伙伴 === */
.partners-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-8); }
.partner-item { width: 160px; height: 80px; background: var(--color-white); border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; padding: var(--space-4); box-shadow: var(--shadow-sm); transition: all var(--transition-base); filter: grayscale(100%); opacity: 0.6; }
.partner-item:hover { filter: grayscale(0%); opacity: 1; box-shadow: var(--shadow-md); transform: translateY(-2px); }
.partner-item img { max-height: 40px; max-width: 120px; object-fit: contain; }

/* === 数据统计 === */
.stats-section { background: var(--gradient-hero); position: relative; overflow: hidden; }
.stats-section::before { content: ''; position: absolute; inset: 0; background: url('data:image/svg+xml,<svg width="60" height="60" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="g" width="60" height="60" patternUnits="userSpaceOnUse"><circle cx="30" cy="30" r="1" fill="rgba(200,164,92,0.1)"/></pattern></defs><rect fill="url(%23g)" width="60" height="60"/></svg>'); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-8); position: relative; z-index: 1; }
.stat-item { text-align: center; }
.stat-item .number { font-size: var(--text-5xl); font-weight: var(--font-black); color: var(--color-accent); margin-bottom: var(--space-2); }
.stat-item .number span { font-size: var(--text-2xl); }
.stat-item .label { font-size: var(--text-base); color: var(--color-gray-400); }
@media (max-width: 768px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }

/* === 时间线 === */
.timeline { position: relative; padding-left: var(--space-12); }
.timeline::before { content: ''; position: absolute; left: 24px; top: 0; bottom: 0; width: 2px; background: var(--gradient-accent); }
.timeline-item { position: relative; margin-bottom: var(--space-10); }
.timeline-item .dot { position: absolute; left: calc(-1 * var(--space-12) + 16px); top: 4px; width: 18px; height: 18px; background: var(--color-accent); border-radius: 50%; border: 3px solid var(--color-bg-dark); box-shadow: 0 0 0 3px var(--color-accent); }
.timeline-item .year { font-size: var(--text-sm); font-weight: var(--font-bold); color: var(--color-accent); margin-bottom: var(--space-2); }
.timeline-item h3 { font-size: var(--text-xl); color: var(--color-white); margin-bottom: var(--space-2); }
.timeline-item p { font-size: var(--text-sm); color: var(--color-gray-400); line-height: var(--leading-relaxed); }

/* === 表单 === */
.form-group { margin-bottom: var(--space-6); }
.form-group label { display: block; font-size: var(--text-sm); font-weight: var(--font-semibold); color: var(--color-gray-700); margin-bottom: var(--space-2); }
.form-control { width: 100%; padding: var(--space-3) var(--space-4); border: 2px solid var(--color-gray-200); border-radius: var(--radius-lg); font-size: var(--text-base); font-family: inherit; transition: all var(--transition-base); background: var(--color-white); }
.form-control:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 3px var(--color-accent-glow); }
textarea.form-control { min-height: 120px; resize: vertical; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-6); }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }

/* === 页脚 === */
.footer { background: var(--color-gray-900); color: var(--color-gray-400); padding: var(--space-20) 0 var(--space-8); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--space-12); margin-bottom: var(--space-12); }
.footer-brand .brand-name { font-size: var(--text-xl); font-weight: var(--font-bold); color: var(--color-white); margin-bottom: var(--space-4); }
.footer-brand p { font-size: var(--text-sm); line-height: var(--leading-relaxed); margin-bottom: var(--space-6); }
.footer-social { display: flex; gap: var(--space-3); }
.footer-social a { width: 40px; height: 40px; background: rgba(255,255,255,0.05); border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; transition: all var(--transition-base); }
.footer-social a:hover { background: var(--color-accent); color: var(--color-primary); }
.footer h4 { font-size: var(--text-base); color: var(--color-white); margin-bottom: var(--space-6); }
.footer ul li { margin-bottom: var(--space-3); }
.footer ul a { font-size: var(--text-sm); transition: color var(--transition-base); }
.footer ul a:hover { color: var(--color-accent); }
.footer-contact li { display: flex; align-items: flex-start; gap: var(--space-3); font-size: var(--text-sm); margin-bottom: var(--space-4); }
.footer-contact .icon { color: var(--color-accent); flex-shrink: 0; margin-top: 2px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.05); padding-top: var(--space-8); display: flex; justify-content: space-between; align-items: center; font-size: var(--text-sm); flex-wrap: wrap; gap: var(--space-4); }
.footer-bottom a:hover { color: var(--color-accent); }
@media (max-width: 1024px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .footer-grid { grid-template-columns: 1fr; } .footer-bottom { flex-direction: column; text-align: center; } }

/* === 页面横幅 === */
.page-banner { padding: var(--space-40) 0 var(--space-20); background: var(--gradient-hero); position: relative; overflow: hidden; }
.page-banner::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at 70% 50%, rgba(200, 164, 92, 0.06) 0%, transparent 60%); }
.page-banner .container { position: relative; z-index: 1; }
.page-banner h1 { font-size: var(--text-5xl); color: var(--color-white); margin-bottom: var(--space-4); }
.page-banner .breadcrumb { display: flex; align-items: center; gap: var(--space-2); font-size: var(--text-sm); color: var(--color-gray-400); }
.page-banner .breadcrumb a { color: var(--color-gray-400); transition: color var(--transition-base); }
.page-banner .breadcrumb a:hover { color: var(--color-accent); }
.page-banner .breadcrumb .sep { color: var(--color-gray-600); }

/* === 动画 === */
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-20px); } }
@keyframes scrollDown { 0% { opacity: 1; transform: translate(-50%, 0); } 100% { opacity: 0; transform: translate(-50%, 12px); } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideInLeft { from { opacity: 0; transform: translateX(-30px); } to { opacity: 1; transform: translateX(0); } }
@keyframes slideInRight { from { opacity: 0; transform: translateX(30px); } to { opacity: 1; transform: translateX(0); } }
@keyframes scaleIn { from { opacity: 0; transform: scale(0.9); } to { opacity: 1; transform: scale(1); } }
@keyframes shimmer { 0% { background-position: -200% center; } 100% { background-position: 200% center; } }
@keyframes rotate { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

/* 滚动动画 */
.reveal { opacity: 0; transform: translateY(30px); transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1); }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-left { opacity: 0; transform: translateX(-30px); transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1); }
.reveal-left.visible { opacity: 1; transform: translateX(0); }
.reveal-right { opacity: 0; transform: translateX(30px); transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1); }
.reveal-right.visible { opacity: 1; transform: translateX(0); }
.reveal-scale { opacity: 0; transform: scale(0.9); transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1); }
.reveal-scale.visible { opacity: 1; transform: scale(1); }

/* 延迟动画 */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }
.delay-6 { transition-delay: 0.6s; }

/* === 回到顶部 === */
.back-to-top { position: fixed; bottom: var(--space-8); right: var(--space-8); width: 48px; height: 48px; background: var(--color-accent); color: var(--color-primary); border-radius: var(--radius-full); display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-lg); opacity: 0; visibility: hidden; transform: translateY(20px); transition: all var(--transition-base); z-index: var(--z-sticky); }
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-4px); box-shadow: var(--shadow-glow-lg); }

/* === 加载动画 === */
.page-loader { position: fixed; inset: 0; background: var(--color-bg-dark); z-index: 9999; display: flex; align-items: center; justify-content: center; transition: opacity 0.5s, visibility 0.5s; }
.page-loader.hidden { opacity: 0; visibility: hidden; }
.page-loader .spinner { width: 48px; height: 48px; border: 3px solid rgba(200, 164, 92, 0.2); border-top-color: var(--color-accent); border-radius: 50%; animation: rotate 0.8s linear infinite; }

/* === 产品筛选 === */
.filter-bar { display: flex; flex-wrap: wrap; gap: var(--space-2); justify-content: center; margin-bottom: var(--space-12); }
.filter-btn { padding: var(--space-2) var(--space-5); border-radius: var(--radius-full); font-size: var(--text-sm); font-weight: var(--font-medium); color: var(--color-gray-600); background: var(--color-gray-100); transition: all var(--transition-base); }
.filter-btn:hover, .filter-btn.active { background: var(--color-accent); color: var(--color-primary); }

/* === 侧边栏 === */
.sidebar { position: sticky; top: 100px; }
.sidebar-widget { background: var(--color-white); border-radius: var(--radius-xl); padding: var(--space-6); margin-bottom: var(--space-6); box-shadow: var(--shadow-card); border: 1px solid var(--color-gray-100); }
.sidebar-widget h3 { font-size: var(--text-lg); margin-bottom: var(--space-4); padding-bottom: var(--space-3); border-bottom: 2px solid var(--color-gray-100); }
.sidebar-widget .cat-list li { padding: var(--space-2) 0; border-bottom: 1px solid var(--color-gray-100); }
.sidebar-widget .cat-list li:last-child { border-bottom: none; }
.sidebar-widget .cat-list a { display: flex; justify-content: space-between; font-size: var(--text-sm); color: var(--color-gray-600); }
.sidebar-widget .cat-list a:hover { color: var(--color-accent); }
.sidebar-widget .cat-list .count { background: var(--color-gray-100); padding: 0 var(--space-2); border-radius: var(--radius-sm); font-size: var(--text-xs); }

/* === 联系信息 === */
.contact-info-card { background: var(--gradient-hero); border-radius: var(--radius-xl); padding: var(--space-10); color: var(--color-white); }
.contact-info-card h3 { font-size: var(--text-2xl); margin-bottom: var(--space-6); }
.contact-item { display: flex; align-items: flex-start; gap: var(--space-4); margin-bottom: var(--space-6); }
.contact-item .icon { width: 48px; height: 48px; background: rgba(200, 164, 92, 0.15); border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; flex-shrink: 0; color: var(--color-accent); }
.contact-item .info .label { font-size: var(--text-sm); color: var(--color-gray-400); margin-bottom: var(--space-1); }
.contact-item .info .value { font-size: var(--text-base); font-weight: var(--font-medium); }

/* === FAQ === */
.faq-item { border: 1px solid var(--color-gray-200); border-radius: var(--radius-lg); margin-bottom: var(--space-3); overflow: hidden; transition: all var(--transition-base); }
.faq-item:hover { border-color: var(--color-accent); }
.faq-question { padding: var(--space-5) var(--space-6); display: flex; justify-content: space-between; align-items: center; cursor: pointer; font-weight: var(--font-semibold); }
.faq-question .icon { transition: transform var(--transition-base); color: var(--color-accent); }
.faq-item.open .faq-question .icon { transform: rotate(45deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height var(--transition-slow); }
.faq-answer .content { padding: 0 var(--space-6) var(--space-5); font-size: var(--text-sm); color: var(--color-text-light); line-height: var(--leading-relaxed); }
.faq-item.open .faq-answer { max-height: 500px; }

/* === 招聘 === */
.job-card { background: var(--color-white); border-radius: var(--radius-xl); padding: var(--space-8); box-shadow: var(--shadow-card); border: 1px solid var(--color-gray-100); transition: all var(--transition-base); }
.job-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card-hover); border-color: var(--color-accent); }
.job-card .header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: var(--space-4); }
.job-card h3 { font-size: var(--text-xl); }
.job-card .salary { font-size: var(--text-lg); font-weight: var(--font-bold); color: var(--color-accent); }
.job-card .tags { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-4); }
.job-card .tag { font-size: var(--text-xs); padding: var(--space-1) var(--space-3); background: var(--color-gray-100); color: var(--color-gray-600); border-radius: var(--radius-full); }
.job-card .requirements { margin-bottom: var(--space-4); }
.job-card .requirements h4 { font-size: var(--text-sm); color: var(--color-gray-700); margin-bottom: var(--space-2); }
.job-card .requirements li { font-size: var(--text-sm); color: var(--color-text-light); padding: var(--space-1) 0; padding-left: var(--space-4); position: relative; }
.job-card .requirements li::before { content: ''; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; background: var(--color-accent); border-radius: 50%; }

/* === 解决方案 === */
.solution-card { background: var(--color-white); border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-card); transition: all var(--transition-base); }
.solution-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-card-hover); }
.solution-card .icon-area { height: 200px; background: var(--gradient-hero); display: flex; align-items: center; justify-content: center; font-size: 4rem; }
.solution-card .body { padding: var(--space-6); }
.solution-card h3 { font-size: var(--text-xl); margin-bottom: var(--space-3); }
.solution-card p { font-size: var(--text-sm); color: var(--color-text-light); line-height: var(--leading-relaxed); margin-bottom: var(--space-4); }
.solution-card .features { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.solution-card .feature { font-size: var(--text-xs); padding: var(--space-1) var(--space-3); background: var(--color-gray-100); border-radius: var(--radius-full); color: var(--color-gray-600); }

/* === 自定义滚动条 === */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--color-gray-100); }
::-webkit-scrollbar-thumb { background: var(--color-gray-300); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-gray-400); }

/* === 选中样式 === */
::selection { background: var(--color-accent); color: var(--color-primary); }

/* === 打印样式 === */
@media print {
  .navbar, .footer, .back-to-top, .page-loader { display: none !important; }
  .hero { min-height: auto; padding: var(--space-8) 0; }
  body { color: #000; background: #fff; }
}