/* PepVeri Biotech — 白+海军蓝（#1F3B73）生物科技简洁风 */
:root {
  --blue-900: #142c58;
  --blue-700: #1f3b73;
  --blue-600: #2a4f96;
  --blue-500: #5a7ab8;
  --blue-100: #e3eaf7;
  --blue-50: #f2f5fb;
  --ink: #14213d;
  --ink-soft: #4a5a76;
  --line: #dfe6f2;
  --bg: #ffffff;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(31, 59, 115, 0.10);
  --max: 1160px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }
a { color: var(--blue-700); text-decoration: none; }
a:hover { color: var(--blue-900); }

/* 页面底层柔光背景：让毛玻璃卡片有可模糊的底色 */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -1;
  background:
    radial-gradient(560px 420px at 8% 12%, rgba(31, 59, 115, 0.14), transparent 65%),
    radial-gradient(640px 480px at 92% 28%, rgba(90, 122, 184, 0.12), transparent 65%),
    radial-gradient(520px 420px at 22% 82%, rgba(31, 59, 115, 0.08), transparent 65%),
    radial-gradient(600px 460px at 85% 88%, rgba(79, 174, 179, 0.10), transparent 65%);
}

.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ===== 顶栏 ===== */
.topbar {
  background: var(--blue-900);
  color: #cdd9ef;
  font-size: 13px;
}
.topbar .container {
  display: flex; justify-content: space-between; align-items: center;
  height: 36px;
}
.topbar a { color: #fff; font-weight: 600; }

header.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; color: var(--blue-900); letter-spacing: 0.5px; }
.logo svg { width: 30px; height: 30px; }
.logo span em { color: var(--blue-600); font-style: normal; }

nav.main-nav { display: flex; gap: 28px; align-items: center; }
nav.main-nav a {
  color: var(--ink); font-weight: 600; font-size: 15px;
  padding: 6px 2px; border-bottom: 2px solid transparent;
}
nav.main-nav a:hover, nav.main-nav a.active { color: var(--blue-700); border-bottom-color: var(--blue-600); }

.btn {
  display: inline-block; border: none; cursor: pointer;
  background: var(--blue-700); color: #fff !important;
  font-weight: 700; font-size: 15px;
  padding: 12px 26px; border-radius: 999px;
  transition: background 0.2s, transform 0.15s, color 0.2s;
}
.btn:hover { background: var(--blue-900); color: #fff !important; transform: translateY(-1px); }
.btn-outline {
  background: transparent; color: var(--blue-700) !important;
  border: 2px solid var(--blue-700);
}
.btn-outline:hover { background: var(--blue-100); }
.btn-sm { padding: 8px 18px; font-size: 13.5px; }

/* ===== Hero（视频背景） ===== */
.hero {
  position: relative;
  background: linear-gradient(135deg, #ffffff 0%, var(--blue-50) 55%, var(--blue-100) 100%);
  overflow: hidden;
}
.hero-video {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  z-index: 0;
}
.hero-overlay {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(90deg,
    rgba(255, 255, 255, 0.97) 0%,
    rgba(255, 255, 255, 0.90) 40%,
    rgba(242, 245, 251, 0.55) 100%);
}
.hero-inner {
  position: relative; z-index: 2;
  padding: 84px 0 72px;
}
.hero-inner > div { max-width: 620px; }
.kicker {
  display: inline-flex; align-items: center; gap: 8px;
  background: #fff; border: 1px solid var(--line);
  color: var(--blue-700); font-weight: 700; font-size: 13px;
  letter-spacing: 1.5px; text-transform: uppercase;
  padding: 7px 16px; border-radius: 999px; margin-bottom: 22px;
}
.kicker::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--blue-600); }
.hero h1 {
  font-size: 44px; line-height: 1.18; font-weight: 800;
  color: var(--blue-900); letter-spacing: -0.5px;
}
.hero h1 em { color: var(--blue-600); font-style: normal; }
.hero p.lead {
  margin: 20px 0 30px; font-size: 17.5px; color: var(--ink-soft); max-width: 560px;
}
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }

.cas-jump { margin-top: 34px; }
.cas-jump .label { font-size: 13px; font-weight: 700; color: var(--ink-soft); letter-spacing: 1px; text-transform: uppercase; margin-bottom: 10px; }
.cas-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.cas-chips a {
  font-size: 12.5px; font-weight: 600;
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(10px) saturate(1.4);
  -webkit-backdrop-filter: blur(10px) saturate(1.4);
  border: 1px solid rgba(255, 255, 255, 0.75);
  color: var(--ink); padding: 6px 12px; border-radius: 8px;
  transition: all 0.15s;
}
.cas-chips a:hover { border-color: var(--blue-600); color: var(--blue-700); background: var(--blue-50); }

.stat-card {
  background: rgba(255, 255, 255, 0.60);
  backdrop-filter: blur(16px) saturate(1.5);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  border: 1px solid rgba(255, 255, 255, 0.75);
  box-shadow: 0 8px 24px rgba(20, 44, 88, 0.08);
  border-radius: var(--radius);
  padding: 20px 18px;
}
.stat-card b { display: block; font-size: 26px; color: var(--blue-700); font-weight: 800; }
.stat-card span { font-size: 13px; color: var(--ink-soft); font-weight: 600; }
/* ===== 工厂视频（三列并排） ===== */
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.video-card {
  border: 1px solid rgba(255, 255, 255, 0.75); border-radius: var(--radius);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.60);
  backdrop-filter: blur(16px) saturate(1.5);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  box-shadow: 0 8px 24px rgba(20, 44, 88, 0.08);
  transition: transform 0.2s, box-shadow 0.2s;
}
.video-card:hover { transform: translateY(-3px); box-shadow: 0 14px 36px rgba(31, 59, 115, 0.18); }
.video-card video {
  width: 100%; aspect-ratio: 16 / 9; object-fit: cover;
  display: block; background: var(--blue-900);
}
.vc-caption { padding: 18px 22px 20px; }
.vc-caption h3 { color: var(--blue-900); font-size: 17px; margin-bottom: 4px; }
.vc-caption p { font-size: 13.5px; color: var(--ink-soft); }
@media (max-width: 900px) {
  .video-grid { grid-template-columns: 1fr; }
}

/* ===== 设施图片卡（About） ===== */
.photo-stack { display: flex; flex-direction: column; gap: 18px; }
.photo-card {
  margin: 0; border: 1px solid rgba(255, 255, 255, 0.75); border-radius: var(--radius);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.60);
  backdrop-filter: blur(16px) saturate(1.5);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  box-shadow: 0 8px 24px rgba(20, 44, 88, 0.08);
  transition: transform 0.2s, box-shadow 0.2s;
}
.photo-card:hover { transform: translateY(-3px); box-shadow: 0 14px 36px rgba(31, 59, 115, 0.18); }
.photo-card img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; display: block; }

/* ===== 通用区块 ===== */
section.block { padding: 78px 0; }
section.block.alt { background: var(--blue-50); }
.section-head { max-width: 720px; margin-bottom: 44px; }
.section-head .eyebrow {
  color: var(--blue-600); font-weight: 800; font-size: 13px;
  letter-spacing: 2px; text-transform: uppercase; margin-bottom: 10px;
}
.section-head h2 { font-size: 32px; font-weight: 800; color: var(--blue-900); letter-spacing: -0.3px; }
.section-head p { margin-top: 12px; color: var(--ink-soft); font-size: 16px; }
.center { margin-left: auto; margin-right: auto; text-align: center; }

/* ===== 视频背景区块（Featured） ===== */
.video-bg-section {
  position: relative; overflow: hidden;
  background: var(--blue-900); /* 视频加载前的兜底 */
}
.video-bg-section .section-video {
  position: absolute; inset: 0;
  width: 100%; height: 100%; object-fit: cover;
  z-index: 0;
}
.video-bg-section .video-overlay {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(180deg,
    rgba(255, 255, 255, 0.86) 0%,
    rgba(255, 255, 255, 0.72) 45%,
    rgba(255, 255, 255, 0.82) 100%);
}
.video-bg-section .video-bg-content { position: relative; z-index: 2; }

/* ===== 卡片网格 ===== */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }

.card {
  background: rgba(255, 255, 255, 0.60);
  backdrop-filter: blur(16px) saturate(1.5);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  border: 1px solid rgba(255, 255, 255, 0.75); border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(20, 44, 88, 0.08);
  padding: 28px 26px; transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover { box-shadow: 0 14px 36px rgba(31, 59, 115, 0.18); transform: translateY(-3px); }
.card .icon {
  width: 46px; height: 46px; border-radius: 12px;
  background: var(--blue-100); color: var(--blue-700);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px; font-size: 22px; font-weight: 800;
}
.card h3 { font-size: 18px; color: var(--blue-900); margin-bottom: 10px; }
.card p { font-size: 14.5px; color: var(--ink-soft); }
.card .meta { margin-top: 14px; font-size: 12.5px; font-weight: 700; color: var(--blue-600); letter-spacing: 0.5px; }

/* ===== 特色产品卡 ===== */
.feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feat-card { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; transition: box-shadow 0.2s, transform 0.2s; display: flex; flex-direction: column; }
.feat-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.feat-top {
  background: linear-gradient(135deg, var(--blue-700), var(--blue-500));
  color: #fff; padding: 22px 24px;
}
.feat-top .tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.feat-top .tag {
  font-size: 11px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
  background: rgba(255,255,255,0.18); padding: 4px 10px; border-radius: 999px;
}
.feat-top h3 { font-size: 21px; font-weight: 800; }
.feat-top .purity { margin-top: 8px; font-size: 13px; opacity: 0.92; font-weight: 600; }
.feat-body { padding: 20px 24px 24px; flex: 1; display: flex; flex-direction: column; }
.spec-row { display: flex; justify-content: space-between; gap: 12px; font-size: 13.5px; padding: 7px 0; border-bottom: 1px dashed var(--line); }
.spec-row span:first-child { color: var(--ink-soft); font-weight: 600; }
.spec-row span:last-child { font-weight: 700; color: var(--ink); text-align: right; }
.feat-body .btn { margin-top: 18px; text-align: center; }

/* ===== 产品目录 ===== */
.catalog-toolbar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }
.filter-btn {
  border: 1px solid var(--line); background: #fff; color: var(--ink);
  font-weight: 700; font-size: 13.5px; padding: 9px 18px; border-radius: 999px;
  cursor: pointer; transition: all 0.15s;
}
.filter-btn:hover { border-color: var(--blue-600); color: var(--blue-700); }
.filter-btn.active { background: var(--blue-700); border-color: var(--blue-700); color: #fff; }

.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.product-card {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: #fff; padding: 22px; display: flex; flex-direction: column;
  transition: box-shadow 0.2s, transform 0.2s;
}
.product-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.product-card .cat {
  font-size: 11px; font-weight: 800; letter-spacing: 1.2px; text-transform: uppercase;
  color: var(--blue-600); margin-bottom: 8px;
}
.product-card h3 { font-size: 18px; color: var(--blue-900); }
.product-card .alias { font-size: 12.5px; color: var(--ink-soft); margin-top: 2px; }
.product-card .purity-badge {
  display: inline-block; margin-top: 10px;
  background: var(--blue-100); color: var(--blue-700);
  font-size: 12px; font-weight: 800; padding: 4px 10px; border-radius: 6px;
}
.product-card .specs { margin-top: 14px; flex: 1; }
.product-card .desc { font-size: 13px; color: var(--ink-soft); margin-top: 12px; }
.product-card .foot { display: flex; gap: 10px; margin-top: 16px; align-items: center; justify-content: space-between; }
.lead-time { font-size: 12px; color: var(--ink-soft); font-weight: 600; }

.notice {
  background: var(--blue-50); border: 1px solid var(--line); border-left: 4px solid var(--blue-600);
  border-radius: 10px; padding: 16px 20px; font-size: 14px; color: var(--ink-soft);
  margin-bottom: 34px;
}
.notice b { color: var(--blue-900); }

/* ===== 质检流程（时间线） ===== */
.qa-steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; counter-reset: qa; }
.qa-step {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 18px; position: relative;
}
.qa-step .num {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--blue-700); color: #fff; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 14px; font-size: 15px;
}
.qa-step h4 { font-size: 15px; color: var(--blue-900); margin-bottom: 8px; }
.qa-step p { font-size: 12.5px; color: var(--ink-soft); }
.qa-step .check { margin-top: 12px; font-size: 11.5px; font-weight: 800; color: var(--blue-600); letter-spacing: 1px; }

/* ===== 阶梯询价 ===== */
.tier-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.tier-card {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: #fff; padding: 28px 26px; display: flex; flex-direction: column;
  position: relative;
}
.tier-card.hot { border: 2px solid var(--blue-600); box-shadow: var(--shadow); }
.tier-card .flag {
  position: absolute; top: -13px; left: 26px;
  background: var(--blue-600); color: #fff; font-size: 11px; font-weight: 800;
  letter-spacing: 1px; padding: 5px 14px; border-radius: 999px; text-transform: uppercase;
}
.tier-card .tier-label { font-size: 12px; font-weight: 800; letter-spacing: 1.5px; text-transform: uppercase; color: var(--blue-600); }
.tier-card .range { font-size: 26px; font-weight: 800; color: var(--blue-900); margin: 8px 0 4px; }
.tier-card .use { font-size: 14px; color: var(--ink-soft); margin-bottom: 16px; }
.tier-card ul { list-style: none; margin-bottom: 22px; flex: 1; }
.tier-card ul li { font-size: 13.5px; color: var(--ink-soft); padding: 7px 0 7px 24px; position: relative; }
.tier-card ul li::before {
  content: "✓"; position: absolute; left: 0; top: 6px;
  color: var(--blue-600); font-weight: 800;
}
.tier-card .btn { text-align: center; }

/* ===== 联系页 ===== */
.contact-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 30px; align-items: start; }
.form-card {
  background: rgba(255, 255, 255, 0.66);
  backdrop-filter: blur(16px) saturate(1.5);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  border: 1px solid rgba(255, 255, 255, 0.75); border-radius: var(--radius);
  padding: 32px; box-shadow: 0 8px 24px rgba(20, 44, 88, 0.08);
}
.form-card h3 { color: var(--blue-900); font-size: 20px; margin-bottom: 6px; }
.form-card .sub { font-size: 13.5px; color: var(--ink-soft); margin-bottom: 24px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 700; color: var(--ink); margin-bottom: 6px; }
.field label i { color: #d64545; font-style: normal; }
.field input, .field select, .field textarea {
  width: 100%; border: 1px solid var(--line); border-radius: 10px;
  padding: 11px 14px; font-size: 14px; font-family: inherit; color: var(--ink);
  background: var(--blue-50); outline: none; transition: border 0.15s, background 0.15s;
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--blue-600); background: #fff; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-ok {
  display: none; background: var(--blue-50); border: 1px solid var(--blue-600);
  color: var(--blue-900); font-weight: 700; padding: 14px 18px; border-radius: 10px; margin-top: 14px;
}
.form-err {
  display: none; background: #fef2f2; border: 1px solid #ef4444;
  color: #b91c1c; font-weight: 600; padding: 14px 18px; border-radius: 10px; margin-top: 14px;
}
.channel-card {
  background: rgba(20, 44, 88, 0.82);
  backdrop-filter: blur(16px) saturate(1.5);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #fff; border-radius: var(--radius); padding: 30px; margin-bottom: 22px;
  box-shadow: 0 8px 24px rgba(20, 44, 88, 0.18);
}
.channel-card h3 { font-size: 18px; margin-bottom: 14px; }
.channel-card a { display: block; color: #cdd9ef; font-size: 14.5px; padding: 6px 0; }
.channel-card a b { color: #fff; }
.guar-list { list-style: none; }
.guar-list li { padding: 9px 0 9px 26px; position: relative; font-size: 14px; color: var(--ink-soft); border-bottom: 1px dashed var(--line); }
.guar-list li::before { content: "✓"; position: absolute; left: 0; color: var(--blue-600); font-weight: 800; }

/* ===== 页脚 ===== */
footer.site-footer { background: var(--blue-900); color: #b9ccef; margin-top: 40px; }
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 30px;
  padding: 56px 0 40px;
}
.site-footer h4 { color: #fff; font-size: 15px; margin-bottom: 14px; }
.site-footer a { color: #b9ccef; display: block; padding: 4px 0; font-size: 13.5px; }
.site-footer a:hover { color: #fff; }
.site-footer p { font-size: 13.5px; max-width: 320px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.12); padding: 18px 0; font-size: 12.5px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* ===== 页头横幅（内页） ===== */
.page-hero {
  background: linear-gradient(135deg, var(--blue-50), var(--blue-100));
  padding: 56px 0; border-bottom: 1px solid var(--line);
}
.page-hero h1 { font-size: 34px; font-weight: 800; color: var(--blue-900); }
.page-hero p { margin-top: 10px; color: var(--ink-soft); max-width: 680px; font-size: 16px; }

/* ===== 响应式 ===== */
@media (max-width: 980px) {
  .hero-inner { padding: 56px 0; }
  .hero h1 { font-size: 34px; }
  .grid-3, .grid-4, .feat-grid, .product-grid, .tier-grid { grid-template-columns: repeat(2, 1fr); }
  .qa-steps { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  nav.main-nav { display: none; }
}
@media (max-width: 620px) {
  .grid-2, .grid-3, .grid-4, .feat-grid, .product-grid, .tier-grid, .qa-steps, .field-row { grid-template-columns: 1fr; }
  section.block { padding: 54px 0; }
}