/* 上海百析生物医药科技有限公司 - 企业官网样式
   设计基调：科学 · 精密 · 可信赖
   品牌色：深蓝（logo 主色）主导 + 荧光绿（logo 点睛色）克制点缀
   2026-07-23 专业化重构：统一配色、字体与图标系统，去 emoji，加化学视觉元素 */

/* ========== CSS Variables ========== */
:root {
  /* 品牌蓝 */
  --primary: #0b4a97;
  --primary-dark: #093a78;
  --primary-deep: #082c58;
  --primary-ink: #06234a;
  --primary-light: #e9f1fb;
  --primary-softer: #f4f8fc;
  /* 荧光绿（logo 点睛色，仅小面积使用） */
  --accent: #d4ed00;
  --accent-deep: #9db000;
  /* 中性墨蓝（标题/正文） */
  --ink: #10233f;
  --ink-soft: #2c3e57;
  /* 灰色阶 */
  --gray-900: #1c2434;
  --gray-800: #2b3547;
  --gray-700: #46536a;
  --gray-600: #5f6c85;
  --gray-500: #8d99ae;
  --gray-400: #b7c0d1;
  --gray-300: #dbe1ea;
  --gray-200: #e9edf3;
  --gray-100: #f4f6fa;
  --white: #ffffff;
  --bg-app: #f5f8fc;  /* 蓝调浅底，替代纯白，营造纵深 */
  /* 阴影（蓝调、克制、精密，去棉软感） */
  --shadow-xs: 0 1px 2px rgba(11,74,151,.04);
  --shadow-sm: 0 2px 6px rgba(11,74,151,.05);
  --shadow-md: 0 6px 20px rgba(11,74,151,.08);
  --shadow-lg: 0 14px 40px rgba(11,74,151,.12);
  --shadow-primary: 0 8px 20px rgba(11,74,151,.30);
  /* 交互亮蓝（科技感电光蓝，用于 hover / 链接 / 强调线） */
  --primary-bright: #2f80ed;
  --primary-bright-soft: #e6f0ff;
  /* 圆角（锐利精密，去卡通感） */
  --radius: 6px;
  --radius-lg: 10px;
  --radius-xl: 12px;
  --transition: all .28s cubic-bezier(.4,0,.2,1);
  --font-cn: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", "Segoe UI", sans-serif;
  --font-num: "Helvetica Neue", "Segoe UI", system-ui, -apple-system, sans-serif;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-cn);
  color: var(--ink-soft);
  line-height: 1.75;
  background: var(--bg-app);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* 全站极淡光晕，营造科技纵深（不压内容、固定层置于内容之下） */
body::before {
  content: ''; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(1100px 560px at 82% -8%, rgba(47,128,237,.06), transparent 60%),
    radial-gradient(820px 460px at 0% 18%, rgba(11,74,151,.05), transparent 55%);
}

a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; }
html, body { overflow-x: hidden; max-width: 100%; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 28px; }
.section { padding: 96px 0; }

.section-header { text-align: center; margin-bottom: 60px; }

.section-tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; font-weight: 700; color: var(--primary);
  letter-spacing: 3px; text-transform: uppercase; margin-bottom: 14px;
}
.section-tag::before, .section-tag::after {
  content: ''; width: 26px; height: 2px; background: var(--primary); opacity: .55;
}

.section-title {
  font-size: 34px; font-weight: 800; color: var(--ink);
  line-height: 1.3; letter-spacing: -0.02em;
}

.section-desc {
  font-size: 16px; color: var(--gray-600); margin-top: 16px;
  max-width: 620px; margin-left: auto; margin-right: auto;
}

/* ========== 图标系统（SVG sprite） ========== */
.ico {
  display: inline-block; vertical-align: middle;
  width: 1.25em; height: 1.25em; flex-shrink: 0;
  fill: none; stroke: currentColor;
}
.ico-xl { width: 2.2em; height: 2.2em; }
.ico-lg { width: 1.7em; height: 1.7em; }
.ico-sm { width: 1em; height: 1em; }

/* 图标徽章（浅蓝实底 + 细蓝边 + 蓝色线性图标，精密去渐变） */
.icon-badge {
  display: inline-flex; align-items: center; justify-content: center;
  width: 52px; height: 52px; border-radius: 12px;
  background: var(--primary-bright-soft); color: var(--primary);
  border: 1px solid rgba(47,128,237,.18);
}
.icon-badge .ico { width: 25px; height: 25px; stroke-width: 1.6; }

/* ========== 化学装饰元素 ========== */
.chem-decor { position: absolute; pointer-events: none; color: var(--primary); }
.chem-decor .ico, .chem-decor svg { width: 100%; height: 100%; stroke-width: 1; }

/* ========== Navigation ========== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(18px) saturate(1.4);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
  border-bottom: 1px solid var(--gray-200);
  transition: var(--transition);
}
.navbar.scrolled { background: rgba(255,255,255,.96); box-shadow: var(--shadow-sm); }
.navbar .container { display: flex; align-items: center; justify-content: space-between; height: 72px; }

.nav-logo { display: flex; align-items: center; gap: 12px; }
.nav-logo .logo-img { height: 66px; width: auto; display: block; }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  display: inline-flex; align-items: center; min-height: 44px;
  padding: 8px 16px; font-size: 15px; font-weight: 500;
  color: var(--gray-700); border-radius: var(--radius); position: relative;
}
.nav-links a:not(.nav-cta)::after {
  content: ''; position: absolute; left: 16px; right: 16px; bottom: 4px;
  height: 2px; background: var(--primary); border-radius: 2px;
  transform: scaleX(0); transform-origin: left; transition: transform .3s ease;
}
.nav-links a:not(.nav-cta):hover, .nav-links a:not(.nav-cta).active { color: var(--primary); }
.nav-links a:not(.nav-cta):hover::after, .nav-links a:not(.nav-cta).active::after { transform: scaleX(1); }

.nav-cta {
  margin-left: 14px; padding: 10px 22px !important;
  background: var(--primary) !important; color: #fff !important;
  border-radius: var(--radius) !important; font-weight: 600 !important;
  box-shadow: var(--shadow-primary);
}
.nav-cta:hover { background: var(--primary-dark) !important; transform: translateY(-1px); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; background: none; border: none; }
.nav-toggle span { width: 24px; height: 2px; background: var(--ink); border-radius: 2px; transition: var(--transition); }

/* ========== Hero Section ========== */
.hero {
  min-height: 100vh; display: flex; align-items: center; position: relative;
  background:
    linear-gradient(rgba(11,74,151,.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11,74,151,.055) 1px, transparent 1px),
    radial-gradient(1100px 560px at 78% 12%, rgba(47,128,237,.18), transparent 60%),
    radial-gradient(900px 520px at 6% 100%, rgba(11,74,151,.16), transparent 55%),
    linear-gradient(155deg, #f4f8fe 0%, #e9f1fb 48%, #f6fafe 100%);
  background-size: 46px 46px, 46px 46px, 100% 100%, 100% 100%, 100% 100%;
  padding: 96px 0 40px; padding-top: 72px; overflow: hidden;
}
/* 化学分子点阵背景（右上角，半透明苯环群） */
.hero-molecules {
  position: absolute; top: 0; right: -4%; width: 46%; height: 100%;
  pointer-events: none; z-index: 0; opacity: .5;
}
.hero-molecules .mol {
  position: absolute; color: rgba(11,74,151,.16);
}
.hero::before {
  content: ''; position: absolute; width: 620px; height: 620px; border-radius: 50%;
  background: radial-gradient(circle, rgba(47,128,237,.18) 0%, transparent 70%);
  top: -220px; right: -180px;
}
.hero::after {
  content: ''; position: absolute; width: 420px; height: 420px; border-radius: 50%;
  background: radial-gradient(circle, rgba(47,128,237,.14) 0%, transparent 70%);
  bottom: -120px; left: -120px;
}
.hero .container {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 72px;
  align-items: center; position: relative; z-index: 1;
}

.hero-content { animation: fadeInUp .8s ease; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 16px; background: rgba(11,74,151,.06); border: 1px solid rgba(11,74,151,.16);
  border-radius: 6px; font-size: 12px; font-weight: 600; color: var(--primary);
  margin-bottom: 26px; letter-spacing: 1.2px; text-transform: uppercase;
}
.hero-badge .dot {
  width: 8px; height: 8px; background: var(--accent); border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(212,237,0,.25); animation: pulse 2s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .35; } }

.hero h1 {
  font-size: 54px; font-weight: 800; color: #0d2440;
  line-height: 1.16; margin-bottom: 22px; letter-spacing: -0.02em;
}
.hero h1 .hl {
  position: relative; color: var(--primary-bright); white-space: nowrap;
}
.hero h1 .hl::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: 2px; height: 3px;
  background: linear-gradient(90deg, var(--accent), rgba(212,237,0,0));
  border-radius: 2px;
}

.hero p {
  font-size: 17px; color: #45566c; line-height: 1.85;
  margin-bottom: 38px; max-width: 92%;
}

.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 15px 34px; font-size: 15px; font-weight: 600;
  border-radius: var(--radius); border: none; cursor: pointer;
  transition: var(--transition); font-family: var(--font-cn);
  letter-spacing: .01em;
}
.btn .ico { width: 17px; height: 17px; }

.btn-primary { background: var(--primary); color: #fff; box-shadow: var(--shadow-primary); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 12px 28px rgba(11,74,151,.36); }

.btn-outline { background: var(--white); color: var(--ink); border: 1.5px solid var(--gray-300); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow-sm); }

.hero-trust {
  display: flex; flex-wrap: wrap; gap: 12px 26px; margin-top: 34px;
  font-size: 14px; color: var(--gray-600); font-weight: 500;
}
.hero-trust span { display: inline-flex; align-items: center; gap: 7px; }
.hero-trust .ico { width: 15px; height: 15px; color: var(--primary); }

/* Hero 右侧：化学视觉卡片 */
.hero-visual { position: relative; animation: fadeInRight .8s ease; }

.hero-card {
  background: rgba(255,255,255,.72); border-radius: var(--radius-lg);
  box-shadow: 0 24px 60px rgba(11,74,151,.14); padding: 34px; position: relative; overflow: hidden;
  border: 1px solid rgba(11,74,151,.14);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.hero-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary-bright), var(--accent));
}
.hero-card-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.hero-stat {
  padding: 22px 16px; background: rgba(255,255,255,.6); border-radius: var(--radius);
  text-align: center; border: 1px solid rgba(11,74,151,.12);
  transition: var(--transition);
}
.hero-stat:hover { border-color: var(--primary-bright); background: rgba(47,128,237,.08); }
.hero-stat .number {
  font-family: var(--font-num); font-size: 34px; font-weight: 800;
  color: var(--primary-bright); letter-spacing: -0.02em; font-variant-numeric: tabular-nums;
}
.hero-stat .label { font-size: 13px; color: var(--gray-600); margin-top: 4px; }

/* ========== Features ========== */
.features { background: var(--white); }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }

.feature-card {
  padding: 36px 30px; border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200); transition: var(--transition);
  position: relative; overflow: hidden; display: flex; flex-direction: column;
  background: var(--white);
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary-bright), var(--primary));
  transform: scaleX(0); transform-origin: left; transition: transform .35s ease;
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover { border-color: var(--primary-bright); transform: translateY(-2px); box-shadow: var(--shadow-md); }

.feature-header { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.feature-icon { display: flex; align-items: center; justify-content: center; }
.feature-icon .icon-badge { width: 1.7em; height: 1.7em; border-radius: 6px; }
.feature-icon .icon-badge .ico { width: 1.05em; height: 1.05em; }
.feature-card h3 { font-size: 19px; font-weight: 700; color: var(--ink); margin-bottom: 0; letter-spacing: -0.01em; }
.feature-card p { font-size: 15px; color: var(--gray-600); line-height: 1.75; flex: 1; }

/* ========== Page Hero（子页头 · 深色科技版，与首页统一） ========== */
.page-hero {
  padding: 152px 0 86px; position: relative; overflow: hidden; text-align: center;
  background:
    linear-gradient(rgba(11,74,151,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11,74,151,.045) 1px, transparent 1px),
    radial-gradient(900px 480px at 82% 0%, rgba(47,128,237,.14), transparent 60%),
    radial-gradient(820px 480px at 0% 100%, rgba(11,74,151,.12), transparent 55%),
    linear-gradient(155deg, #f4f8fe 0%, #e9f1fb 48%, #f6fafe 100%);
  background-size: 46px 46px, 46px 46px, 100% 100%, 100% 100%, 100% 100%;
}
.page-hero::before {
  content: ''; position: absolute; width: 540px; height: 540px; border-radius: 50%;
  background: radial-gradient(circle, rgba(47,128,237,.12) 0%, transparent 70%);
  top: -190px; right: -140px; animation: heroFloat 15s ease-in-out infinite;
}
.page-hero::after {
  content: ''; position: absolute; width: 440px; height: 440px; border-radius: 50%;
  background: radial-gradient(circle, rgba(47,128,237,.08) 0%, transparent 70%);
  bottom: -170px; left: -130px; animation: heroFloat 19s ease-in-out infinite reverse;
}
@keyframes heroFloat { 0%,100% { transform: translate(0,0); } 50% { transform: translate(34px,-26px); } }
.page-hero h1 { font-size: 42px; font-weight: 800; color: var(--ink); margin-bottom: 16px; letter-spacing: -0.01em; position: relative; }
.page-hero p { font-size: 17px; color: var(--gray-600); max-width: 640px; margin: 0 auto; position: relative; }
.page-hero .section-tag { justify-content: center; }

/* ========== CTA Band ========== */
.cta-band {
  margin-top: 100px;
  background: linear-gradient(135deg, #0b4a97 0%, #0d56ad 55%, #1170d6 100%);
  border-radius: var(--radius-lg);
  padding: 64px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 24px 48px -24px rgba(11,74,151,.5);
}
.cta-band h2 { color: #fff; font-size: 30px; font-weight: 800; margin-bottom: 14px; letter-spacing: -0.01em; }
.cta-band p { color: rgba(255,255,255,.82); font-size: 16px; max-width: 620px; margin: 0 auto 32px; line-height: 1.75; }
.cta-band .cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.cta-band .btn-primary { background: #fff; color: #0b4a97; border-color: #fff; }
.cta-band .btn-primary:hover { background: #eaf2ff; }
.cta-band .btn-outline { color: #fff; border-color: rgba(255,255,255,.55); }
.cta-band .btn-outline:hover { background: rgba(255,255,255,.12); border-color: #fff; }

/* ========== Products Grid ========== */
.products-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.product-card {
  border-radius: var(--radius-lg); border: 1px solid var(--gray-200);
  overflow: hidden; transition: var(--transition); background: var(--white);
  display: flex; flex-direction: column;
}
.product-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--primary-bright); }

.product-img {
  height: 190px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--primary-softer), #eaf1fa);
  color: var(--primary); position: relative; overflow: hidden;
}
.product-img .ico { width: 84px; height: 84px; stroke-width: 1; opacity: .9; }

.product-body { padding: 26px; display: flex; flex-direction: column; flex: 1; }
.product-body h3 { font-size: 19px; font-weight: 700; color: var(--ink); margin-bottom: 0; }
.product-header { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; flex-wrap: wrap; }
.product-body .product-tag {
  display: inline-block; padding: 5px 12px; background: var(--primary-bright-soft);
  color: var(--primary); font-size: 12px; font-weight: 600; border-radius: var(--radius); margin-bottom: 0;
  width: fit-content; border: 1px solid rgba(47,128,237,.16); letter-spacing: .3px;
}
.product-body p { font-size: 15.5px; color: var(--gray-600); line-height: 1.75; margin-bottom: 20px; flex: 1; }
.product-body .btn { padding: 10px 20px; font-size: 14px; align-self: flex-start; min-height: 44px; }

/* 产品详情交替布局（products.html） */
.product-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; margin-bottom: 84px; }
.product-detail:last-child { margin-bottom: 0; }
.pd-visual {
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-lg); min-height: 260px; position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--primary-softer), #e8f0fa);
  border: 1px solid var(--gray-200); color: var(--primary);
}
.pd-visual img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block;
}
.pd-visual .ico { width: 110px; height: 110px; stroke-width: 0.9; }
.pd-visual::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(circle at 72% 22%, rgba(47,128,237,.10), transparent 60%);
}
.pd-text { display: flex; flex-direction: column; }
.pd-header { display: flex; align-items: center; gap: 14px; margin-bottom: 16px; flex-wrap: wrap; }
.pd-header .product-tag {
  margin-bottom: 0; display: inline-block; padding: 5px 12px;
  background: var(--primary-bright-soft); color: var(--primary); font-size: 12px; font-weight: 600;
  border-radius: var(--radius); border: 1px solid rgba(47,128,237,.16); letter-spacing: .3px;
}
.pd-header h2 { margin-bottom: 0; }
.product-detail:nth-child(even) .pd-visual { order: 2; }

/* ========== About Page ========== */
.about-story { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.about-image { border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-lg); position: relative; }
.about-image .img-placeholder {
  width: 100%; height: 400px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--primary-softer), #e8f0fa);
  color: var(--primary); position: relative;
}
.about-image .img-placeholder .ico { width: 120px; height: 120px; stroke-width: .9; }
.about-text h2 { font-size: 32px; font-weight: 800; color: var(--ink); margin-bottom: 20px; letter-spacing: -0.01em; }
.about-text p { font-size: 15px; color: var(--gray-600); line-height: 1.85; margin-bottom: 16px; }

.about-values { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; margin-top: 48px; }
.value-item {
  text-align: center; padding: 34px 18px; border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200); transition: var(--transition); background: var(--white);
}
.value-item:hover { border-color: var(--primary-bright); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.value-item .value-header { display: flex; align-items: center; justify-content: center; gap: 10px; margin-bottom: 8px; }
.value-item .value-header .icon-badge { width: 1.7em; height: 1.7em; }
.value-item .value-header .icon-badge .ico { width: 1.05em; height: 1.05em; }
.value-item h4 { font-size: 16px; font-weight: 700; color: var(--ink); margin-bottom: 8px; }
.value-item p { font-size: 14px; color: var(--gray-600); line-height: 1.6; }

/* ========== Contact Page ========== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 64px; align-items: start; }
.contact-info h2 { font-size: 30px; font-weight: 800; color: var(--ink); margin-bottom: 16px; letter-spacing: -0.01em; }
.contact-info > p { font-size: 15px; color: var(--gray-600); margin-bottom: 40px; line-height: 1.85; }

.contact-item { display: flex; gap: 18px; margin-bottom: 30px; align-items: flex-start; }
.contact-item .icon {
  width: 50px; height: 50px; min-width: 50px; background: var(--primary-bright-soft);
  border-radius: var(--radius); display: flex; align-items: center; justify-content: center;
  color: var(--primary); border: 1px solid rgba(47,128,237,.16);
}
.contact-item .icon .ico { width: 22px; height: 22px; }
.contact-item h4 { font-size: 15px; font-weight: 700; color: var(--ink); margin-bottom: 5px; }
.contact-item p { font-size: 14px; color: var(--gray-600); line-height: 1.7; }
.contact-item strong { color: var(--primary); font-family: var(--font-num); font-variant-numeric: tabular-nums; }

.contact-form {
  background: var(--white); border: 1px solid var(--gray-200);
  border-radius: var(--radius-xl); padding: 42px; box-shadow: var(--shadow-md);
}
.contact-form h3 { font-size: 24px; font-weight: 800; color: var(--ink); margin-bottom: 28px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; color: var(--gray-700); margin-bottom: 8px; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 13px 16px; font-size: 14px;
  border: 1.5px solid var(--gray-300); border-radius: var(--radius);
  font-family: var(--font-cn); transition: var(--transition);
  background: var(--white); color: var(--ink);
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px rgba(11,74,151,.1);
}

/* 键盘可达性：清晰的焦点轮廓 */
a:focus-visible, button:focus-visible, .btn:focus-visible, .chip-link:focus-visible, summary:focus-visible {
  outline: 2px solid var(--primary-bright);
  outline-offset: 2px;
  border-radius: 4px;
}
.form-group textarea { min-height: 120px; resize: vertical; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ========== Footer ========== */
.footer { background: var(--primary-ink); color: rgba(255,255,255,.65); padding: 76px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 48px; padding-bottom: 48px; border-bottom: 1px solid rgba(255,255,255,.1); }
.footer-brand .logo { display: inline-flex; align-items: center; gap: 10px; margin-bottom: 18px; background: transparent; border-radius: 0; padding: 0; box-shadow: none; }
.footer-brand .logo .logo-img { height: 52px; width: auto; display: block; }
.footer-brand p { font-size: 14px; line-height: 1.85; margin-bottom: 24px; }
.footer h4 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 20px; letter-spacing: .02em; }
.footer-links a { display: flex; align-items: center; gap: 8px; font-size: 14px; padding: 6px 0; color: rgba(255,255,255,.6); transition: var(--transition); }
.footer-links a .ico { width: 15px; height: 15px; color: var(--accent); opacity: .9; }
.footer-links a:hover { color: #fff; padding-left: 4px; }
.footer-bottom { padding: 24px 0; text-align: center; font-size: 13px; color: rgba(255,255,255,.4); }
.footer-bottom .icp { white-space: nowrap; }

/* ========== Animations ========== */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInRight { from { opacity: 0; transform: translateX(30px); } to { opacity: 1; transform: translateX(0); } }
.animate-in { opacity: 0; transform: translateY(28px); transition: all .65s cubic-bezier(.4,0,.2,1); }
.animate-in.visible { opacity: 1; transform: translateY(0); }

/* ========== Quality System ========== */
.quality-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.quality-card {
  padding: 36px 26px; border-radius: var(--radius-lg); background: var(--white);
  border: 1px solid var(--gray-200); text-align: center; transition: var(--transition);
}
.quality-card:hover { border-color: var(--primary-bright); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.quality-header { display: flex; align-items: center; justify-content: center; gap: 10px; margin-bottom: 12px; }
.quality-card .qc-icon { margin: 0; display: flex; align-items: center; justify-content: center; }
.quality-card .qc-icon.icon-badge { width: 1.7em; height: 1.7em; border-radius: 6px; }
.quality-card .qc-icon.icon-badge .ico { width: 1.05em; height: 1.05em; }
.quality-card h3 { font-size: 18px; font-weight: 700; color: var(--ink); margin-bottom: 0; }
.quality-card p { font-size: 14px; color: var(--gray-600); line-height: 1.75; }

/* ========== Structure Quick Browse ========== */
.struct-browse { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 36px; }
.struct-browse a {
  padding: 10px 22px; background: var(--white); border: 1px solid var(--gray-300);
  border-radius: 8px; font-size: 14px; color: var(--gray-700); transition: var(--transition);
}
.struct-browse a:hover { background: var(--primary); color: #fff; border-color: var(--primary); transform: translateY(-2px); }

/* ========== Partner / Chip Tags ========== */
.partner-tag {
  display: inline-block; padding: 7px 17px; background: var(--primary-light);
  color: var(--gray-700); font-size: 14px; font-weight: 500; border-radius: 8px; transition: var(--transition);
}
.partner-tag:hover { background: var(--primary); color: #fff; }

.chip-link {
  display: inline-flex; align-items: center; gap: 6px; padding: 7px 15px;
  background: var(--primary-softer); border: 1px solid var(--gray-200); border-radius: 8px;
  font-size: 13px; color: var(--gray-700); transition: var(--transition);
}
.chip-link:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.chip-link .ico { width: 13px; height: 13px; }

/* ========== Stats Band（数据统计条） ========== */
.stats-band {
  border-radius: var(--radius-xl); padding: 60px 48px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-deep) 100%);
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px;
  text-align: center; color: #fff; position: relative; overflow: hidden;
}
.stats-band::before {
  content: ''; position: absolute; top: -60px; right: -60px; width: 240px; height: 240px;
  border-radius: 50%; background: radial-gradient(circle, rgba(255,255,255,.12), transparent 70%);
}
.stats-band .stat-num { font-family: var(--font-num); font-size: 46px; font-weight: 800; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.stats-band .stat-label { font-size: 15px; opacity: .82; margin-top: 8px; }

/* ========== 移动端直达搜索（手机端直接搜 CAS 号） ========== */
/* 导航栏搜索按钮：桌面隐藏，移动端显示在汉堡菜单左侧 */
.nav-search-btn {
  display: none;
  align-items: center; justify-content: center;
  width: 44px; height: 44px; margin-right: 8px; flex: none;
  border-radius: var(--radius); color: var(--primary);
  background: var(--primary-softer); border: 1px solid var(--gray-200);
  text-decoration: none; transition: var(--transition);
}
.nav-search-btn:hover { border-color: var(--primary-bright); background: rgba(47,128,237,.10); }
.nav-search-btn svg { width: 22px; height: 22px; }
/* 首页 hero 内搜索条：桌面端常驻显示，与导航「产品搜索」入口并存 */
.hero-search-top { width: 100%; max-width: 680px; margin: 18px 0 0; }
.hero-search-hint { font-size: 13px; color: var(--gray-500); margin-top: 8px; margin-bottom: 0; line-height: 1.4; white-space: nowrap; }
.hero-search {
  display: flex; align-items: center; gap: 0; width: 100%;
  background: #fff; border: 2px solid var(--primary); border-radius: 999px;
  padding: 4px 4px 4px 20px; box-shadow: var(--shadow-sm);
  transition: border-color .2s, box-shadow .2s;
}
.hero-search:focus-within { border-color: var(--primary-bright); box-shadow: 0 0 0 4px rgba(47,128,237,.12); }
.hero-search input {
  flex: 1; min-width: 0; border: none; outline: none; background: transparent;
  font-size: 16px; padding: 13px 12px; color: var(--ink); font-family: var(--font-cn);
}
.hero-search input::placeholder { color: var(--gray-400); font-size: 15px; }
.hero-search .hs-submit {
  flex: none; display: flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border: none; border-radius: 50%;
  background: transparent; color: var(--primary); cursor: pointer;
  transition: background .2s, color .2s; padding: 0;
}
.hero-search .hs-submit:hover { background: rgba(11,74,151,.08); color: var(--primary-dark); }
.hero-search .hs-ico { width: 22px; height: 22px; flex: none; }

/* ========== Responsive ========== */
@media (max-width: 968px) {
  .hero .container { grid-template-columns: 1fr; text-align: center; gap: 48px; }
  .hero h1 { font-size: 40px; }
  .hero p { margin-left: auto; margin-right: auto; }
  .hero-buttons, .hero-trust { justify-content: center; }
  .hero { min-height: auto; overflow: hidden; padding: 110px 0 48px; }
  .hero-molecules { display: none; }
  .hero-struct { display: none; }
  .hero-content { position: relative; z-index: 2; }
  .features-grid, .products-grid { grid-template-columns: 1fr 1fr; }
  .about-story, .contact-grid { grid-template-columns: 1fr; }
  .about-values, .quality-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-band { grid-template-columns: 1fr 1fr; gap: 36px 16px; padding: 48px 28px; }
  .nav-links {
    display: none; position: absolute; top: 72px; left: 0; right: 0;
    background: var(--white); flex-direction: column; padding: 24px;
    box-shadow: var(--shadow-lg); border-top: 1px solid var(--gray-200); gap: 4px;
  }
  .nav-links.open { display: flex; }
  .nav-links a:not(.nav-cta)::after { display: none; }
  .nav-toggle { display: flex; }
  .nav-search-btn { display: flex; margin-left: auto; }
  .nav-links a { padding: 13px 16px; font-size: 16px; }
  .hero-search-top { max-width: 680px; margin: 18px auto 0; }
  .hero-search-hint { text-align: center; }
  .hero-search { padding: 4px 4px 4px 18px; }
  .hero-search input { padding: 13px 10px; }
  .hero-search .hs-submit { width: 42px; height: 42px; }
}

@media (max-width: 640px) {
  .section { padding: 64px 0; }
  .section-title { font-size: 27px; }
  .container { padding: 0 20px; }
  .hero-search-top { margin: 16px auto 0; }
  .hero-search-hint { white-space: normal; font-size: 12px; }
  .hero-search { padding: 3px 3px 3px 16px; }
  .hero-search input { padding: 12px 10px; font-size: 15px; }
  .hero-search .hs-submit { width: 40px; height: 40px; }
  .hero h1 { font-size: 34px; }
  .nav-logo .logo-img { height: 54px; }
  .features-grid, .products-grid, .about-values, .quality-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .stats-band { grid-template-columns: 1fr 1fr; }
  .stats-band .stat-num { font-size: 36px; }
  .product-detail { grid-template-columns: 1fr; gap: 26px; margin-bottom: 56px; }
  .product-detail:nth-child(even) .pd-visual { order: 0; }
  .pd-visual { min-height: 200px; }
  .pd-visual .ico { width: 84px; height: 84px; }
  .pd-text { text-align: center; align-items: center; }
  .pd-text > div[style*="display:flex"] { justify-content: center !important; }
  .page-hero { padding: 120px 0 60px; }
  .page-hero h1 { font-size: 29px; }
  .contact-form { padding: 30px 22px; }
  .contact-item { flex-direction: column; gap: 10px; }
  .form-row { grid-template-columns: 1fr; }
}

/* ========== 产品分类卡片实物图 ========== */
.product-img img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* ========== Hero 结构式装饰 ========== */
.hero-struct { position: absolute; top: 9%; right: 4%; width: 300px; height: 220px; opacity: .24; z-index: 0; pointer-events: none; }

/* ========== Trust Bar（信任背书条） ========== */
.trust-bar { background: var(--primary-ink); position: relative; z-index: 2; }
.trust-bar-inner { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; padding: 22px 28px; }
.tb-item { display: flex; align-items: center; gap: 14px; color: #fff; padding: 6px 20px; border-left: 1px solid rgba(255,255,255,.1); }
.tb-item:first-child { border-left: none; padding-left: 0; }
.tb-item .ico { width: 30px; height: 30px; color: var(--accent); flex-shrink: 0; }
.tb-item b { display: block; font-size: 15px; font-weight: 700; letter-spacing: .01em; }
.tb-item span { font-size: 12.5px; color: rgba(255,255,255,.6); }

/* ========== 精选热销砌块 ========== */
.featured-blocks { background: var(--white); }
.featured-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.fb-card { display: flex; flex-direction: column; border: 1px solid var(--gray-200); border-radius: var(--radius-lg); overflow: hidden; transition: var(--transition); background: var(--white); }
.fb-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--primary-bright); }
.fb-struct { height: 172px; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--primary-softer), #eaf1fa); border-bottom: 1px solid var(--gray-200); padding: 8px; }
.fb-canvas { width: 100%; height: 100%; }
.fb-nostruct { font-family: var(--font-num); font-size: 14px; color: var(--gray-500); text-align: center; padding: 0 12px; }
.fb-body { padding: 16px 18px 18px; display: flex; flex-direction: column; flex: 1; }
.fb-name { font-size: 13.5px; font-weight: 600; color: var(--ink); line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; min-height: 38px; }
.fb-cas { font-size: 12px; color: var(--gray-500); font-family: var(--font-num); margin-top: 6px; }
.fb-meta { display: flex; justify-content: space-between; align-items: center; font-size: 12px; margin-top: 8px; }
.fb-sku { color: var(--gray-600); font-family: var(--font-num); }
.fb-stock { display: inline-flex; align-items: center; font-size: 12px; font-weight: 600; padding: 2px 9px; border-radius: 999px; }
.fb-stock.in { color: #147a3f; background: rgba(20,122,63,.10); }
.fb-stock.pre { color: #b07a00; background: rgba(176,122,0,.12); }
.fb-price { margin-top: 10px; font-family: var(--font-num); font-size: 19px; font-weight: 800; color: var(--primary); letter-spacing: -0.01em; }
.fb-price.inquiry { font-size: 15px; color: var(--gray-600); font-weight: 700; }
.featured-more { text-align: center; margin-top: 40px; }

/* ===== 技术资源板块（对标 GBW「专业知识」，百析原创内容） ===== */
.techres { background: linear-gradient(180deg, var(--primary-softer), #eef4fb); border-top: 1px solid var(--gray-200); border-bottom: 1px solid var(--gray-200); }
.techres .feature-card { background: var(--white); }

/* ========== 新增板块响应式 ========== */
@media (max-width: 968px) {
  .featured-grid { grid-template-columns: repeat(2, 1fr); }
  .trust-bar-inner { grid-template-columns: 1fr 1fr; }
  .tb-item { padding: 12px 16px; border-left: none; }
  .tb-item:first-child { padding-left: 16px; }
}
@media (max-width: 640px) {
  .featured-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .hero-struct { display: none; }
  .trust-bar-inner { grid-template-columns: 1fr; }
}

/* ========== 科技感：卡片悬停辉光 + 渐变描边 ========== */
.feature-card, .product-card, .quality-card, .value-item, .fb-card { position: relative; }
.feature-card::after, .product-card::after, .quality-card::after, .value-item::after, .fb-card::after {
  content: ''; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  box-shadow: 0 0 0 1px rgba(47,128,237,0); transition: var(--transition);
}
.feature-card:hover, .product-card:hover, .quality-card:hover, .value-item:hover, .fb-card:hover {
  box-shadow: 0 18px 50px rgba(11,74,151,.18), 0 0 0 1px rgba(47,128,237,.42);
}
.icon-badge { transition: var(--transition); }
.value-item:hover .icon-badge, .feature-card:hover .icon-badge { box-shadow: 0 0 18px rgba(47,128,237,.38); transform: translateY(-1px); }

/* ========== about 实景图与画廊 ========== */
.about-image img { width: 100%; height: 100%; object-fit: cover; display: block; min-height: 400px; }
.about-gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 30px; }
.about-gallery figure { position: relative; border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); margin: 0; }
.about-gallery img { width: 100%; height: 220px; object-fit: cover; display: block; transition: var(--transition); }
.about-gallery figure:hover img { transform: scale(1.06); }
.about-figure-cap { position: absolute; left: 0; right: 0; bottom: 0; padding: 14px 16px; font-size: 13.5px; font-weight: 600; color: #fff; background: linear-gradient(0deg, rgba(6,24,47,.82), transparent); letter-spacing: .3px; }

/* ========== 统计数字 count-up ========== */
.stat-num.counting { color: #8fc1ff; }

@media (max-width: 968px) {
  .about-gallery { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .about-image img { min-height: 280px; }
  .about-gallery { grid-template-columns: 1fr; }
  .about-gallery img { height: 180px; }
}

/* ========== 无障碍：尊重「减少动效」系统偏好 ========== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .animate-in { opacity: 1 !important; transform: none !important; }
}

/* ========== 企业微信二维码 ========== */
.wechat-qr-link { display: inline-block; line-height: 0; border-radius: var(--radius); }
.qr-thumb {
  width: 92px; height: 92px; object-fit: cover;
  border: 1px solid var(--gray-300); border-radius: var(--radius);
  background: #fff; display: block;
  transition: transform .15s ease, box-shadow .15s ease;
}
.qr-thumb:hover { transform: scale(1.03); box-shadow: 0 6px 16px rgba(11,74,151,.15); }
.footer-qr { margin-top: 14px; }
.footer-qr img {
  width: 100px; height: 100px; object-fit: cover;
  border: 1px solid var(--gray-300); border-radius: var(--radius);
  background: #fff; display: block;
}
.footer-qr span {
  display: block; margin-top: 6px; font-size: 12px; color: var(--gray-400); line-height: 1.4;
}
@media (max-width: 768px) {
  .qr-thumb { width: 84px; height: 84px; }
  .footer-qr img { width: 92px; height: 92px; }
}

/* ========== AI 合成评估页 ========== */
.ai-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }
@media (max-width: 820px) { .ai-wrap { grid-template-columns: 1fr; } }
.ai-card {
  background: var(--white); border: 1px solid var(--gray-300);
  border-radius: var(--radius-lg); padding: 26px 26px;
}
.ai-card h3 { font-size: 18px; font-weight: 700; color: var(--dark); margin-bottom: 6px; }
.ai-card .ai-sub { font-size: 13px; color: var(--gray-500); margin-bottom: 18px; line-height: 1.6; }
.ai-input {
  width: 100%; min-height: 84px; resize: vertical; padding: 12px 14px;
  border: 1px solid var(--gray-300); border-radius: var(--radius);
  font-family: var(--font-num); font-size: 14px; color: var(--dark); line-height: 1.6;
  outline: none; transition: border-color .15s ease, box-shadow .15s ease;
}
.ai-input:focus { border-color: var(--primary-bright); box-shadow: 0 0 0 3px rgba(47,128,237,.12); }
.ai-examples { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 18px; }
.ai-chip {
  border: 1px solid var(--gray-300); background: var(--gray-100); color: var(--gray-600);
  border-radius: 999px; padding: 6px 13px; font-size: 12.5px; cursor: pointer;
  transition: all .15s ease;
}
.ai-chip:hover { border-color: var(--primary-bright); color: var(--primary-bright); background: #f4f9ff; }
.ai-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--primary); color: #fff; border: none; border-radius: var(--radius);
  padding: 12px 22px; font-size: 15px; font-weight: 600; cursor: pointer;
  transition: background .15s ease, transform .12s ease;
}
.ai-btn:hover { background: var(--primary-dark, #093d7e); }
.ai-btn:active { transform: translateY(1px); }
.ai-btn-ghost { background: transparent; color: var(--primary); border: 1px solid var(--primary); }
.ai-btn-ghost:hover { background: #f4f9ff; }
.ai-hint { font-size: 12px; color: var(--gray-400); margin-top: 12px; line-height: 1.6; }

/* 结果区 */
.ai-result { text-align: center; }
.ai-canvas-box {
  background: linear-gradient(180deg, #fbfdff, #f2f7fc); border: 1px solid var(--gray-200);
  border-radius: var(--radius); padding: 18px; margin-bottom: 18px;
  display: flex; align-items: center; justify-content: center; min-height: 220px;
}
.ai-canvas-box canvas { max-width: 100%; height: auto; }
.ai-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 16px; }
.ai-metric { background: var(--gray-100); border: 1px solid var(--gray-200); border-radius: var(--radius); padding: 12px 8px; }
.ai-metric .m-val { font-size: 17px; font-weight: 700; color: var(--primary); font-family: var(--font-num); }
.ai-metric .m-label { font-size: 11.5px; color: var(--gray-500); margin-top: 3px; }
.ai-level { display: inline-block; padding: 3px 12px; border-radius: 999px; font-size: 13px; font-weight: 700; margin-bottom: 14px; }
.ai-level.l-low { background: #e6f6ec; color: #1b7a3d; }
.ai-level.l-mid { background: #fff5e0; color: #b9791a; }
.ai-level.l-high { background: #fdecec; color: #c0392b; }
.ai-notes { font-size: 13px; color: var(--gray-600); background: #fffaf0; border: 1px solid #f3e6c8; border-radius: var(--radius); padding: 12px 14px; line-height: 1.7; text-align: left; margin-bottom: 18px; }
.ai-notes b { color: #b9791a; }
.ai-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.ai-empty { color: var(--gray-400); font-size: 14px; padding: 60px 0; }
.ai-err { color: #c0392b; font-size: 13px; margin-top: 10px; }

/* ---- AI 逆合成路线 ---- */
.ai-retro-head { margin-bottom: 22px; }
.ai-retro-head h2 { font-size: 24px; margin: 8px 0 8px; }
.ai-retro-head p { color: var(--gray-500); font-size: 15px; max-width: 760px; }
.ai-loading { padding: 26px 0; color: var(--primary); font-weight: 600; }
.retro-target { font-size: 14px; color: var(--gray-600); margin-bottom: 10px; }
.retro-target code, .retro-reactants code { background: #eef3fb; padding: 1px 6px; border-radius: 4px; font-size: 12px; }
.retro-summary { background: #f1f6fe; border-left: 3px solid var(--primary); padding: 12px 14px; border-radius: 6px; font-size: 14px; margin-bottom: 18px; }
.retro-warn { background: #fff5e0; color: #b9791a; padding: 8px 12px; border-radius: 6px; font-size: 13px; margin-bottom: 14px; }
.retro-timeline { list-style: none; padding: 0; margin: 0 0 8px; }
.retro-step { position: relative; padding: 14px 16px 14px 22px; border-left: 2px solid var(--primary); margin-bottom: 12px; background: #fff; border-radius: 0 8px 8px 0; box-shadow: 0 1px 4px rgba(11,74,151,.06); }
.retro-step::before { content: ""; position: absolute; left: -7px; top: 18px; width: 12px; height: 12px; background: var(--primary); border-radius: 50%; border: 2px solid #fff; }
.retro-step-h { font-weight: 700; font-size: 15px; margin-bottom: 6px; color: var(--primary); }
.retro-reactants, .retro-line { font-size: 13.5px; color: var(--gray-600); margin: 4px 0; line-height: 1.7; }
.retro-note { color: var(--gray-400); font-style: italic; }
.retro-matches { margin-top: 8px; font-size: 13.5px; }
.retro-chip { display: inline-block; background: #e6f6ec; color: #1b7a3d; border: 1px solid #bfe6cd; padding: 3px 10px; border-radius: 999px; font-size: 12.5px; margin: 3px 4px 3px 0; text-decoration: none; }
.retro-chip:hover { background: #d3f0de; }
.retro-price { color: #b9791a; font-weight: 600; }
.retro-mtype { font-size: 11px; color: var(--primary); background: #eaf1fc; padding: 1px 6px; border-radius: 4px; margin-left: 2px; }
.retro-disclaimer { background: #fdecec; color: #c0392b; padding: 10px 14px; border-radius: 6px; font-size: 13px; margin: 14px 0; line-height: 1.6; }

/* 详情页：无 SMILES 时的结构式占位 */
.struct-pending { display:flex; flex-direction:column; align-items:center; justify-content:center; gap:8px; width:100%; height:100%; min-height:160px; color:#6b7280; font-size:13px; text-align:center; }
.struct-pending svg { color:#9ca3af; }
.struct-pending small { color:#374151; font-family:var(--font-num); letter-spacing:.3px; }
.pd-thumb--fallback { display:flex; align-items:center; justify-content:center; }