/* ================================================
   JuvGuard 官网样式
   风格：大气高端、干细胞科技感、深蓝+金色
   ================================================ */

/* ---- 变量 ---- */
:root {
  --primary: #0A1628;      /* 深海蓝 */
  --primary-light: #112240;
  --accent: #C9A84C;       /* 科技金 */
  --accent-light: #E8C96B;
  --teal: #00B4D8;         /* 细胞蓝 */
  --teal-dark: #0077A8;
  --white: #FFFFFF;
  --off-white: #F8F9FB;
  --gray-100: #F1F3F7;
  --gray-200: #E2E6EF;
  --gray-400: #9AAABA;
  --gray-600: #5A6B7C;
  --gray-800: #2C3E50;
  --text: #1A2A3A;
  --text-light: #5A6B7C;
  --success: #28C76F;
  --warning: #FF9F43;
  --danger: #EA5455;
  --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Playfair Display', serif;
  --radius: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 8px rgba(10, 22, 40, 0.06);
  --shadow: 0 4px 20px rgba(10, 22, 40, 0.1);
  --shadow-lg: 0 10px 40px rgba(10, 22, 40, 0.15);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-body); color: var(--text); background: var(--white); line-height: 1.7; overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: var(--transition); }
ul { list-style: none; }

/* ---- 容器 ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container-wide { max-width: 1440px; margin: 0 auto; padding: 0 40px; }

/* ---- 顶部信息栏 ---- */
.topbar { background: var(--primary); color: rgba(255,255,255,0.7); font-size: 13px; padding: 8px 0; }
.topbar .container { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.topbar-left i, .topbar-right i { margin-right: 6px; color: var(--accent); }
.topbar-right { display: flex; gap: 24px; }
.topbar-right a { color: rgba(255,255,255,0.7); }
.topbar-right a:hover { color: var(--accent); }

/* ---- 导航 ---- */
.navbar { background: rgba(255,255,255,0.98); backdrop-filter: blur(20px); position: sticky; top: 0; z-index: 1000; border-bottom: 1px solid var(--gray-200); transition: var(--transition); }
.navbar.scrolled { box-shadow: var(--shadow); }
.navbar .container { display: flex; align-items: center; gap: 32px; height: 72px; }
.logo { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.logo-icon { width: 44px; height: 44px; background: linear-gradient(135deg, var(--teal), var(--primary)); border-radius: 10px; display: flex; align-items: center; justify-content: center; }
.logo-icon span { color: var(--white); font-family: var(--font-display); font-size: 22px; font-weight: 700; }
.logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-main { font-size: 20px; font-weight: 700; color: var(--primary); letter-spacing: -0.5px; }
.logo-sub { font-size: 12px; color: var(--accent); font-weight: 500; letter-spacing: 2px; }
.nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav-links > li { position: relative; }
.nav-links > li > a { display: flex; align-items: center; gap: 4px; padding: 8px 14px; font-size: 15px; font-weight: 500; color: var(--gray-800); border-radius: var(--radius); }
.nav-links > li > a:hover, .nav-links > li > a.active { color: var(--teal); background: rgba(0, 180, 216, 0.06); }
.nav-links > li > a i { font-size: 10px; transition: var(--transition); }
.nav-links > li:hover > a i { transform: rotate(180deg); }
/* 下拉菜单 —— 纯 CSS :hover 方案，::after 伪元素填充间隙防止菜单消失 */
.dropdown { position: relative; }

/* 在 li 底部创建 12px 透明区域，鼠标从链接移向菜单时不会离开 :hover 范围 */
.dropdown::after {
  content: '';
  position: absolute;
  bottom: -12px; left: 0; right: 0; height: 12px;
  /* 透明不可见，仅用于扩展鼠标热区 */
}

.dropdown-menu {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  position: absolute;
  top: calc(100% + 12px); /* 与 ::after 高度一致，紧贴桥接区底部 */
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  min-width: 180px;
  padding: 8px;
  border: 1px solid var(--gray-200);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0s linear 0.18s;
  z-index: 200;
}

/* hover 整个 li（含伪元素桥接区）时显示菜单 */
.dropdown:hover > .dropdown-menu,
.dropdown-menu:hover {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0s linear 0s;
}

.dropdown-menu li a { display: block; padding: 10px 16px; font-size: 14px; color: var(--gray-800); border-radius: var(--radius); white-space: nowrap; }
.dropdown-menu li a:hover { background: rgba(0, 180, 216, 0.06); color: var(--teal); }
.nav-cta { flex-shrink: 0; display: flex; align-items: center; gap: 10px; }
.btn-consult { background: linear-gradient(135deg, var(--teal), var(--teal-dark)); color: var(--white) !important; padding: 10px 22px; border-radius: 24px; font-size: 14px; font-weight: 600; box-shadow: 0 4px 15px rgba(0, 180, 216, 0.3); }
.btn-consult:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0, 180, 216, 0.4); }

/* ---- 语言切换器 ---- */
.lang-switcher { position: relative; }
.lang-btn {
  display: flex; align-items: center; gap: 5px;
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.15);
  color: var(--primary); border-radius: 20px;
  padding: 7px 12px; font-size: 13px; font-weight: 600;
  cursor: pointer; white-space: nowrap;
  transition: background 0.2s, border-color 0.2s;
  line-height: 1;
}
/* 导航栏滚动后背景变白时，按钮颜色保持可见 */
.navbar.scrolled .lang-btn { background: rgba(0,180,216,0.08); border-color: rgba(0,180,216,0.3); color: var(--primary); }
.lang-btn:hover { background: rgba(0,180,216,0.12); border-color: var(--teal); color: var(--teal); }
.lang-caret { font-size: 10px; margin-left: 2px; transition: transform 0.18s; }
.lang-switcher.open .lang-caret { transform: rotate(180deg); }
/* 语言菜单 */
.lang-menu { min-width: 130px; left: 50%; }
.lang-menu li a { padding: 9px 16px; font-size: 13px; }
.lang-menu li.lang-active > a { color: var(--teal); font-weight: 700; background: rgba(0,180,216,0.06); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--primary); border-radius: 2px; transition: var(--transition); }

/* ---- Hero 英雄区 ---- */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; overflow: hidden; background: var(--primary); }
.hero-bg { position: absolute; inset: 0; background: radial-gradient(ellipse at 30% 50%, rgba(0, 180, 216, 0.12) 0%, transparent 60%), radial-gradient(ellipse at 80% 20%, rgba(201, 168, 76, 0.08) 0%, transparent 50%), linear-gradient(135deg, #0A1628 0%, #112240 50%, #0A2540 100%); }
/* 粒子网格背景 */
.hero-grid { position: absolute; inset: 0; background-image: linear-gradient(rgba(0,180,216,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(0,180,216,0.03) 1px, transparent 1px); background-size: 60px 60px; }
.hero-content { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; padding: 120px 0 80px; }
.hero-text {}
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(201, 168, 76, 0.12); border: 1px solid rgba(201, 168, 76, 0.3); color: var(--accent-light); padding: 8px 18px; border-radius: 24px; font-size: 13px; font-weight: 500; margin-bottom: 24px; }
.hero-badge i { font-size: 12px; }
.hero-title { font-size: clamp(36px, 5vw, 62px); font-weight: 700; color: var(--white); line-height: 1.2; margin-bottom: 12px; }
.hero-title .highlight { color: var(--teal); display: block; }
.hero-title .gold { color: var(--accent); }
.hero-subtitle { font-size: 18px; color: rgba(255,255,255,0.65); margin-bottom: 16px; font-weight: 300; letter-spacing: 0.5px; }
.hero-nature { display: flex; align-items: center; gap: 12px; background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.12); border-radius: var(--radius-lg); padding: 16px 20px; margin-bottom: 36px; }
.hero-nature .nature-icon { width: 48px; height: 48px; background: linear-gradient(135deg, #e63946, #c1121f); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; flex-shrink: 0; font-size: 20px; font-weight: 900; color: var(--white); font-family: var(--font-display); letter-spacing: -1px; }
.hero-nature .nature-text { font-size: 13px; color: rgba(255,255,255,0.8); line-height: 1.5; }
.hero-nature .nature-text strong { color: var(--white); font-size: 14px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary { display: inline-flex; align-items: center; gap: 8px; background: linear-gradient(135deg, var(--teal), var(--teal-dark)); color: var(--white); padding: 14px 32px; border-radius: 32px; font-size: 16px; font-weight: 600; box-shadow: 0 6px 24px rgba(0, 180, 216, 0.35); border: none; cursor: pointer; }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 10px 32px rgba(0, 180, 216, 0.45); }
.btn-secondary { display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,0.08); color: var(--white); padding: 14px 32px; border-radius: 32px; font-size: 16px; font-weight: 500; border: 1px solid rgba(255,255,255,0.2); }
.btn-secondary:hover { background: rgba(255,255,255,0.15); border-color: rgba(255,255,255,0.35); }
.hero-visual { display: flex; align-items: center; justify-content: center; }
/* 产品可视化圆形 */
.product-visual { position: relative; width: 420px; height: 420px; }
.product-orb { position: absolute; inset: 0; border-radius: 50%; background: radial-gradient(circle at 40% 40%, rgba(0, 180, 216, 0.2), rgba(0, 119, 168, 0.05)); border: 1px solid rgba(0, 180, 216, 0.2); animation: orbRotate 20s linear infinite; }
.product-orb::before { content: ''; position: absolute; inset: 10%; border-radius: 50%; background: radial-gradient(circle at 40% 40%, rgba(201, 168, 76, 0.1), transparent); border: 1px dashed rgba(201, 168, 76, 0.2); animation: orbRotate 15s linear infinite reverse; }
@keyframes orbRotate { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.product-center { position: absolute; inset: 15%; background: linear-gradient(135deg, rgba(0, 180, 216, 0.15), rgba(10, 22, 40, 0.8)); border-radius: 50%; display: flex; flex-direction: column; align-items: center; justify-content: center; border: 1px solid rgba(0, 180, 216, 0.3); backdrop-filter: blur(10px); }
.product-center .product-icon { font-size: 64px; margin-bottom: 8px; }
.product-center h3 { font-size: 20px; color: var(--white); font-weight: 700; text-align: center; }
.product-center p { font-size: 12px; color: rgba(255,255,255,0.6); text-align: center; }
/* 悬浮数据卡 */
.stat-float { position: absolute; background: rgba(255,255,255,0.95); border-radius: var(--radius-lg); padding: 12px 18px; box-shadow: var(--shadow-lg); backdrop-filter: blur(20px); }
.stat-float.top-right { top: 10%; right: -5%; }
.stat-float.bottom-left { bottom: 15%; left: -5%; }
.stat-float .stat-val { font-size: 24px; font-weight: 700; color: var(--teal); line-height: 1; }
.stat-float .stat-lbl { font-size: 11px; color: var(--gray-600); margin-top: 2px; }
/* 旋转环形图 */
.orbit-ring { position: absolute; inset: -20px; border-radius: 50%; border: 1px dashed rgba(0, 180, 216, 0.15); animation: orbRotate 30s linear infinite; }
.orbit-dot { position: absolute; width: 8px; height: 8px; background: var(--teal); border-radius: 50%; top: -4px; left: 50%; margin-left: -4px; box-shadow: 0 0 12px var(--teal); }

/* ---- 统计数字 ---- */
.stats-bar { background: linear-gradient(135deg, var(--primary-light), var(--primary)); padding: 48px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 24px; }
.stat-item { text-align: center; padding: 16px 8px; border-right: 1px solid rgba(255,255,255,0.08); }
.stat-item:last-child { border-right: none; }
.stat-num { font-size: 36px; font-weight: 700; color: var(--teal); line-height: 1; font-family: var(--font-display); }
.stat-unit { font-size: 14px; color: var(--accent); font-weight: 500; }
.stat-label { font-size: 13px; color: rgba(255,255,255,0.6); margin-top: 8px; }

/* ---- 区块基础 ---- */
.section { padding: 100px 0; }
.section-sm { padding: 60px 0; }
.section-dark { background: var(--primary); color: var(--white); }
.section-gray { background: var(--gray-100); }
.section-header { text-align: center; margin-bottom: 64px; }
.section-tag { display: inline-block; background: rgba(0, 180, 216, 0.1); color: var(--teal); padding: 6px 16px; border-radius: 20px; font-size: 13px; font-weight: 500; margin-bottom: 16px; letter-spacing: 1px; }
.section-title { font-size: clamp(28px, 4vw, 44px); font-weight: 700; color: var(--text); line-height: 1.25; margin-bottom: 16px; }
.section-dark .section-title { color: var(--white); }
.section-title span { color: var(--teal); }
.section-title .gold { color: var(--accent); }
.section-desc { font-size: 16px; color: var(--text-light); max-width: 600px; margin: 0 auto; line-height: 1.8; }
.section-dark .section-desc { color: rgba(255,255,255,0.65); }

/* ---- Nature背书核心区 ---- */
.nature-highlight { background: linear-gradient(135deg, #0A1628 0%, #0A2540 100%); padding: 80px 0; overflow: hidden; position: relative; }
.nature-highlight::before { content: ''; position: absolute; top: -50%; left: -10%; width: 600px; height: 600px; background: radial-gradient(circle, rgba(0,180,216,0.08) 0%, transparent 70%); border-radius: 50%; }
.nature-highlight::after { content: ''; position: absolute; bottom: -30%; right: -5%; width: 400px; height: 400px; background: radial-gradient(circle, rgba(201,168,76,0.06) 0%, transparent 70%); border-radius: 50%; }
.nature-content { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr 1.2fr; gap: 80px; align-items: center; }
.nature-left .journal-badge { display: inline-flex; align-items: center; gap: 12px; margin-bottom: 28px; }
.journal-logo { background: linear-gradient(135deg, #c1121f, #8b0000); color: white; padding: 10px 18px; border-radius: var(--radius); font-family: var(--font-display); font-size: 22px; font-weight: 900; letter-spacing: -1px; }
.journal-info { }
.journal-info .journal-name { font-size: 14px; color: var(--accent); font-weight: 600; }
.journal-info .journal-sub { font-size: 12px; color: rgba(255,255,255,0.5); }
.nature-title { font-size: 28px; font-weight: 700; color: var(--white); line-height: 1.35; margin-bottom: 20px; }
.nature-meta { display: flex; flex-wrap: wrap; gap: 20px; }
.meta-item { display: flex; align-items: center; gap: 8px; font-size: 13px; color: rgba(255,255,255,0.6); }
.meta-item i { color: var(--teal); }
.nature-right { }
.clinical-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.clinical-card { background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius-lg); padding: 24px; transition: var(--transition); }
.clinical-card:hover { background: rgba(255,255,255,0.08); border-color: rgba(0,180,216,0.3); transform: translateY(-3px); }
.clinical-card.featured { background: linear-gradient(135deg, rgba(0, 180, 216, 0.15), rgba(0, 180, 216, 0.05)); border-color: rgba(0, 180, 216, 0.3); grid-column: span 2; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 24px; }
.clinical-num { font-size: 42px; font-weight: 700; color: var(--teal); font-family: var(--font-display); line-height: 1; }
.clinical-num .unit { font-size: 16px; font-weight: 400; }
.clinical-label { font-size: 13px; color: rgba(255,255,255,0.6); margin-top: 6px; line-height: 1.4; }
.clinical-card.featured .clinical-num { font-size: 56px; }
.safety-badge { background: rgba(40, 199, 111, 0.15); border: 1px solid rgba(40, 199, 111, 0.3); color: #28C76F; padding: 8px 16px; border-radius: 24px; font-size: 14px; font-weight: 600; text-align: center; }
.nature-cta { margin-top: 28px; text-align: center; }
.btn-gold { display: inline-flex; align-items: center; gap: 8px; background: linear-gradient(135deg, var(--accent), #A87820); color: var(--white); padding: 14px 32px; border-radius: 32px; font-size: 15px; font-weight: 600; box-shadow: 0 6px 24px rgba(201, 168, 76, 0.3); }
.btn-gold:hover { transform: translateY(-3px); box-shadow: 0 10px 32px rgba(201, 168, 76, 0.4); }

/* ---- 产品特性 ---- */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.feature-card { background: var(--white); border-radius: var(--radius-lg); padding: 36px 28px; border: 1px solid var(--gray-200); transition: var(--transition); position: relative; overflow: hidden; }
.feature-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--teal), var(--accent)); transform: scaleX(0); transform-origin: left; transition: var(--transition); }
.feature-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-6px); border-color: transparent; }
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon { width: 64px; height: 64px; background: linear-gradient(135deg, rgba(0,180,216,0.1), rgba(0,180,216,0.05)); border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; margin-bottom: 20px; font-size: 28px; }
.feature-title { font-size: 20px; font-weight: 700; color: var(--text); margin-bottom: 12px; }
.feature-desc { font-size: 15px; color: var(--text-light); line-height: 1.7; }
.feature-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.feature-tag { background: rgba(0,180,216,0.08); color: var(--teal); padding: 4px 12px; border-radius: 20px; font-size: 12px; font-weight: 500; }

/* ---- 作用机制 ---- */
.mechanism { background: var(--primary); padding: 100px 0; position: relative; overflow: hidden; }
.mechanism::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at 20% 80%, rgba(0, 180, 216, 0.1) 0%, transparent 50%), radial-gradient(ellipse at 80% 20%, rgba(201, 168, 76, 0.05) 0%, transparent 50%); }
.mechanism-content { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.mechanism-steps { display: flex; flex-direction: column; gap: 0; }
.mechanism-step { display: flex; gap: 20px; position: relative; padding-bottom: 32px; }
.mechanism-step:last-child { padding-bottom: 0; }
.mechanism-step:not(:last-child)::after { content: ''; position: absolute; left: 19px; top: 48px; bottom: 0; width: 2px; background: linear-gradient(to bottom, var(--teal), transparent); }
.step-num { width: 40px; height: 40px; background: linear-gradient(135deg, var(--teal), var(--teal-dark)); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--white); font-weight: 700; font-size: 15px; flex-shrink: 0; }
.step-content h4 { font-size: 17px; font-weight: 600; color: var(--white); margin-bottom: 6px; }
.step-content p { font-size: 14px; color: rgba(255,255,255,0.6); line-height: 1.6; }
.mechanism-visual { }
.dna-visual { position: relative; padding: 40px; }
.cell-diagram { background: rgba(0, 180, 216, 0.05); border: 1px solid rgba(0, 180, 216, 0.2); border-radius: var(--radius-lg); padding: 40px; text-align: center; position: relative; }
.cell-diagram::before { content: '🧬'; font-size: 80px; display: block; margin-bottom: 16px; filter: drop-shadow(0 0 20px rgba(0, 180, 216, 0.5)); animation: pulse 3s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { transform: scale(1); filter: drop-shadow(0 0 20px rgba(0, 180, 216, 0.5)); } 50% { transform: scale(1.05); filter: drop-shadow(0 0 30px rgba(0, 180, 216, 0.8)); } }
.cell-diagram h4 { font-size: 18px; color: var(--white); font-weight: 600; margin-bottom: 12px; }
.cell-diagram p { font-size: 14px; color: rgba(255,255,255,0.6); line-height: 1.6; }
.factor-tags { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 20px; }
.factor-tag { background: rgba(0,180,216,0.15); border: 1px solid rgba(0,180,216,0.3); color: var(--teal); padding: 5px 12px; border-radius: 20px; font-size: 12px; }

/* ---- 临床案例预览 ---- */
.cases-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.case-card { background: var(--white); border-radius: var(--radius-lg); padding: 32px; border: 1px solid var(--gray-200); transition: var(--transition); }
.case-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: var(--teal); }
.case-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 16px; }
.case-patient { }
.case-patient .patient-info { font-size: 15px; font-weight: 600; color: var(--text); }
.case-patient .condition { font-size: 13px; color: var(--text-light); margin-top: 4px; }
.case-result { text-align: right; }
.case-result .result-val { font-size: 22px; font-weight: 700; color: var(--success); }
.case-result .result-time { font-size: 12px; color: var(--text-light); }
.case-timeline { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--gray-100); }
.timeline-item { display: flex; gap: 12px; margin-bottom: 8px; }
.timeline-dot { width: 8px; height: 8px; background: var(--teal); border-radius: 50%; margin-top: 7px; flex-shrink: 0; }
.timeline-text { font-size: 14px; color: var(--text-light); line-height: 1.5; }
.timeline-text strong { color: var(--text); }

/* ---- 合作伙伴 ---- */
.partners-strip { background: var(--gray-100); padding: 60px 0; }
.partners-title { text-align: center; font-size: 14px; color: var(--gray-600); text-transform: uppercase; letter-spacing: 3px; margin-bottom: 36px; }
.partners-logos { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 40px; }
.partner-item { display: flex; align-items: center; gap: 10px; background: var(--white); border: 1px solid var(--gray-200); border-radius: var(--radius-lg); padding: 14px 24px; font-size: 14px; font-weight: 500; color: var(--gray-800); transition: var(--transition); }
.partner-item i { color: var(--teal); font-size: 18px; }
.partner-item:hover { border-color: var(--teal); color: var(--teal); box-shadow: var(--shadow-sm); }

/* ---- 文章列表 ---- */
.articles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.article-card { background: var(--white); border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--gray-200); transition: var(--transition); }
.article-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.article-cover { height: 200px; background: linear-gradient(135deg, var(--primary-light), var(--teal-dark)); display: flex; align-items: center; justify-content: center; font-size: 48px; position: relative; overflow: hidden; }
.article-cover img { width: 100%; height: 100%; object-fit: cover; }
.article-cat { position: absolute; top: 14px; left: 14px; background: var(--teal); color: var(--white); padding: 4px 12px; border-radius: 20px; font-size: 12px; font-weight: 500; }
.article-body { padding: 24px; }
.article-title { font-size: 16px; font-weight: 600; color: var(--text); margin-bottom: 10px; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.article-title:hover { color: var(--teal); }
.article-summary { font-size: 14px; color: var(--text-light); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 16px; }
.article-meta { display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--gray-400); padding-top: 16px; border-top: 1px solid var(--gray-100); }
.article-meta i { margin-right: 4px; }

/* ---- CTA 区块 ---- */
.cta-section { background: linear-gradient(135deg, var(--primary), var(--primary-light)); padding: 80px 0; text-align: center; position: relative; overflow: hidden; }
.cta-section::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at center, rgba(0,180,216,0.1) 0%, transparent 70%); }
.cta-content { position: relative; z-index: 2; }
.cta-title { font-size: clamp(28px, 4vw, 44px); font-weight: 700; color: var(--white); margin-bottom: 16px; }
.cta-desc { font-size: 17px; color: rgba(255,255,255,0.7); margin-bottom: 40px; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ---- 页脚 ---- */
.footer { background: #060E1A; }
.footer-top { padding: 70px 0 50px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 60px; }
.footer-logo { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.footer-tagline { font-size: 14px; color: var(--teal); font-weight: 500; margin-bottom: 12px; }
.footer-desc { font-size: 14px; color: rgba(255,255,255,0.45); line-height: 1.7; margin-bottom: 20px; }
.footer-badges { display: flex; flex-wrap: wrap; gap: 8px; }
.badge { background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1); color: rgba(255,255,255,0.5); padding: 6px 12px; border-radius: 20px; font-size: 12px; }
.badge i { color: var(--teal); margin-right: 4px; }
.footer-nav h4, .footer-product h4, .footer-contact h4 { font-size: 15px; font-weight: 600; color: var(--white); margin-bottom: 20px; padding-bottom: 10px; border-bottom: 1px solid rgba(255,255,255,0.08); }
.footer-nav ul li, .footer-product ul li { margin-bottom: 10px; }
.footer-nav ul li a, .footer-product ul li a { font-size: 14px; color: rgba(255,255,255,0.45); }
.footer-nav ul li a:hover, .footer-product ul li a:hover { color: var(--teal); }
.contact-list li { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; color: rgba(255,255,255,0.45); margin-bottom: 12px; }
.contact-list li i { color: var(--teal); margin-top: 3px; flex-shrink: 0; }
.btn-footer-cta { display: inline-flex; align-items: center; gap: 8px; background: linear-gradient(135deg, var(--teal), var(--teal-dark)); color: var(--white); padding: 11px 22px; border-radius: 24px; font-size: 14px; font-weight: 600; margin-top: 16px; box-shadow: 0 4px 15px rgba(0,180,216,0.25); }
.btn-footer-cta:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,180,216,0.35); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); padding: 24px 0; }
.footer-bottom-inner { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 8px; }
.copyright { font-size: 13px; color: rgba(255,255,255,0.3); }
.disclaimer { font-size: 12px; color: rgba(255,255,255,0.2); max-width: 600px; line-height: 1.5; }
.icp a { font-size: 12px; color: rgba(255,255,255,0.25); }

/* ---- 返回顶部 ---- */
.back-to-top { position: fixed; bottom: 100px; right: 24px; width: 44px; height: 44px; background: var(--teal); color: var(--white); border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; box-shadow: var(--shadow); opacity: 0; pointer-events: none; transition: var(--transition); z-index: 999; }
.back-to-top.visible { opacity: 1; pointer-events: auto; }
.back-to-top:hover { transform: translateY(-3px); }
.float-consult { position: fixed; bottom: 160px; right: 24px; z-index: 999; }
.float-btn { display: flex; flex-direction: column; align-items: center; gap: 4px; background: var(--primary); color: var(--white); width: 52px; height: 52px; border-radius: 50%; font-size: 20px; box-shadow: var(--shadow-lg); transition: var(--transition); justify-content: center; }
.float-btn span { font-size: 10px; }
.float-btn:hover { background: var(--teal); transform: scale(1.1); }

/* ---- 面包屑 ---- */
.breadcrumb-section { background: var(--gray-100); padding: 14px 0; border-bottom: 1px solid var(--gray-200); }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 13px; }
.breadcrumb a { color: var(--text-light); }
.breadcrumb a:hover { color: var(--teal); }
.breadcrumb .sep { color: var(--gray-400); }
.breadcrumb .current { color: var(--text); font-weight: 500; }

/* ---- 页面标题区 ---- */
.page-hero { background: linear-gradient(135deg, var(--primary), var(--primary-light)); padding: 80px 0; text-align: center; position: relative; overflow: hidden; }
.page-hero::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at center, rgba(0,180,216,0.1) 0%, transparent 70%); }
.page-hero-content { position: relative; z-index: 2; }
.page-hero h1 { font-size: clamp(32px, 5vw, 54px); font-weight: 700; color: var(--white); margin-bottom: 16px; }
.page-hero p { font-size: 17px; color: rgba(255,255,255,0.65); max-width: 600px; margin: 0 auto; }

/* ---- 表单 ---- */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 14px; font-weight: 500; color: var(--text); margin-bottom: 8px; }
.form-label .required { color: var(--danger); margin-left: 2px; }
.form-control { width: 100%; padding: 12px 16px; border: 1px solid var(--gray-200); border-radius: var(--radius); font-size: 15px; color: var(--text); background: var(--white); transition: var(--transition); font-family: var(--font-body); }
.form-control:focus { outline: none; border-color: var(--teal); box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.1); }
.form-control::placeholder { color: var(--gray-400); }
textarea.form-control { resize: vertical; min-height: 120px; }
.btn-submit { width: 100%; background: linear-gradient(135deg, var(--teal), var(--teal-dark)); color: var(--white); border: none; padding: 14px 32px; border-radius: 32px; font-size: 16px; font-weight: 600; cursor: pointer; transition: var(--transition); font-family: var(--font-body); }
.btn-submit:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0, 180, 216, 0.35); }
.form-success { display: none; background: rgba(40, 199, 111, 0.1); border: 1px solid rgba(40, 199, 111, 0.3); color: var(--success); padding: 16px 20px; border-radius: var(--radius); text-align: center; margin-top: 16px; }
.form-error { color: var(--danger); font-size: 12px; margin-top: 4px; }

/* ---- 分页 ---- */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 48px; }
.page-btn { width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; border-radius: var(--radius); border: 1px solid var(--gray-200); font-size: 14px; color: var(--text); transition: var(--transition); }
.page-btn:hover, .page-btn.active { background: var(--teal); border-color: var(--teal); color: var(--white); }

/* ---- 标签 ---- */
.tag { display: inline-block; background: rgba(0,180,216,0.08); color: var(--teal); padding: 3px 10px; border-radius: 12px; font-size: 12px; }
.tag-gold { background: rgba(201, 168, 76, 0.1); color: var(--accent); }
.tag-green { background: rgba(40, 199, 111, 0.1); color: var(--success); }

/* ---- Alert ---- */
.alert { padding: 14px 18px; border-radius: var(--radius); margin-bottom: 20px; font-size: 14px; }
.alert-success { background: rgba(40,199,111,0.1); border: 1px solid rgba(40,199,111,0.3); color: var(--success); }
.alert-error { background: rgba(234,84,85,0.1); border: 1px solid rgba(234,84,85,0.3); color: var(--danger); }
.alert-info { background: rgba(0,180,216,0.1); border: 1px solid rgba(0,180,216,0.3); color: var(--teal); }

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
  .nature-content { grid-template-columns: 1fr; gap: 40px; }
  .mechanism-content { grid-template-columns: 1fr; }
  .hero-content { grid-template-columns: 1fr; gap: 40px; }
  .product-visual { width: 300px; height: 300px; margin: 0 auto; }
}
@media (max-width: 768px) {
  .topbar { display: none; }
  .nav-links, .nav-cta { display: none; }
  .nav-links.active { display: flex; flex-direction: column; position: fixed; top: 72px; left: 0; right: 0; background: var(--white); padding: 20px; box-shadow: var(--shadow-lg); border-top: 1px solid var(--gray-200); z-index: 999; gap: 0; }
  .nav-links.active > li > a { padding: 14px 16px; }
  /* 移动端：下拉菜单始终展开，覆盖 PC 端的 visibility/opacity 隐藏 */
  .dropdown-menu {
    visibility: visible !important; opacity: 1 !important; pointer-events: auto !important;
    position: static !important; transform: none !important; padding: 0 !important;
    box-shadow: none; border: none; background: var(--gray-100);
    border-radius: var(--radius); margin: 4px 0 4px 16px;
    transition: none !important;
  }
  .nav-cta.active { display: flex; flex-direction: column; padding: 12px 16px; gap: 8px; }
  /* 移动端语言切换器：在 nav-cta 内显示时横向排列 */
  .lang-switcher { position: static; }
  .lang-menu {
    visibility: visible !important; opacity: 1 !important; pointer-events: auto !important;
    position: static !important; transform: none !important; padding: 0 !important;
    box-shadow: none; border: none; background: var(--gray-100);
    border-radius: var(--radius); margin: 4px 0 4px 0;
    display: flex !important; flex-direction: row; gap: 4px; flex-wrap: wrap;
    transition: none !important;
  }
  .lang-menu li a { padding: 6px 12px; font-size: 13px; }
  .nav-toggle { display: flex; }
  .section { padding: 60px 0; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr; }
  .articles-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .clinical-grid { grid-template-columns: 1fr; }
  .clinical-card.featured { grid-column: span 1; grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .partners-logos { flex-direction: column; align-items: stretch; }
  .partner-item { justify-content: center; }
  .cta-actions { flex-direction: column; align-items: center; }
}
@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .stat-num { font-size: 28px; }
}

/* ---- 动画工具类 ---- */
.fade-up { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-up-delay-1 { transition-delay: 0.1s; }
.fade-up-delay-2 { transition-delay: 0.2s; }
.fade-up-delay-3 { transition-delay: 0.3s; }
.fade-up-delay-4 { transition-delay: 0.4s; }