/* ==========================================================================
   常州希辰曦生物科技有限公司 — 官网样式
   纯 CSS，无外部依赖。多页面共用。
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  --ink:        #0b1f2f;
  --ink-2:      #3d566e;
  --ink-3:      #6d8399;
  --brand:      #0b6bcb;
  --brand-dark: #08508f;
  --teal:       #0e8f8f;
  --mint:       #35c4a3;
  --mint-soft:  #bff3e7;
  --deep:       #062a45;
  --deep-2:     #04182a;

  --bg:         #ffffff;
  --bg-soft:    #f3f8fb;
  --bg-softer:  #fafcfe;
  --line:       #e2ebf2;
  --line-soft:  #eef4f8;

  --danger:     #d64545;

  --radius:     14px;
  --radius-lg:  20px;
  --shadow-sm:  0 1px 2px rgba(11, 31, 47, .06), 0 2px 8px rgba(11, 31, 47, .05);
  --shadow:     0 4px 12px rgba(11, 31, 47, .07), 0 12px 32px rgba(11, 31, 47, .07);
  --shadow-lg:  0 18px 48px rgba(11, 31, 47, .13);

  --maxw:       1180px;
  --header-h:   72px;

  --ease:       cubic-bezier(.22, .61, .36, 1);

  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC",
          "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-2);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  color: var(--ink);
  line-height: 1.3;
  margin: 0 0 .6em;
  font-weight: 700;
  letter-spacing: -.01em;
}

p { margin: 0 0 1.1em; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg { max-width: 100%; }
a { color: var(--brand); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--brand-dark); }
strong { color: var(--ink); font-weight: 600; }
em { font-style: normal; color: var(--danger); }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 999;
  padding: 10px 18px;
  background: var(--deep);
  color: #fff;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; color: #fff; }

/* ---------- 布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 96px 0; }
.section-soft { background: var(--bg-soft); }
.section-tight { padding: 68px 0; }
.section-dark {
  background:
    radial-gradient(900px 420px at 82% -10%, rgba(53, 196, 163, .20), transparent 62%),
    linear-gradient(160deg, var(--deep) 0%, var(--deep-2) 100%);
  color: rgba(255, 255, 255, .78);
}
.section-dark h2, .section-dark h3 { color: #fff; }

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--teal);
  background: rgba(14, 143, 143, .09);
  border: 1px solid rgba(14, 143, 143, .18);
  padding: 5px 13px;
  border-radius: 999px;
  margin: 0 0 18px;
}
.eyebrow-light {
  color: var(--mint);
  background: rgba(53, 196, 163, .14);
  border-color: rgba(53, 196, 163, .3);
}

.section-title { font-size: clamp(26px, 3.4vw, 40px); margin-bottom: 16px; }
.section-title.light { color: #fff; }
.section-title-sm { font-size: clamp(22px, 2.6vw, 30px); margin-bottom: 14px; }

.section-sub {
  font-size: 17px;
  color: var(--ink-3);
  max-width: 62ch;
  margin-bottom: 0;
}
.section-head { max-width: 760px; margin-bottom: 52px; }
.section-head-center { margin-left: auto; margin-right: auto; text-align: center; }

.grad {
  background: linear-gradient(100deg, var(--mint), #6fe3f5);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.note { font-size: 13.5px; color: var(--ink-3); margin: 0; }

/* 仅供屏幕阅读器，视觉上隐藏 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* 两栏分割布局 */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: 64px;
  align-items: start;
}
.split-even {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 56px;
  align-items: start;
}
.split > * { min-width: 0; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: inherit;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  transition: transform .22s var(--ease), box-shadow .22s var(--ease),
              background-color .22s var(--ease), color .22s var(--ease),
              border-color .22s var(--ease);
}
.btn:active { transform: translateY(1px) scale(.99); }
.btn[disabled], .btn[aria-disabled="true"] {
  opacity: .6;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: linear-gradient(120deg, var(--teal), var(--brand));
  color: #fff;
  box-shadow: 0 8px 22px rgba(11, 107, 203, .28);
}
.btn-primary:hover {
  color: #fff;
  box-shadow: 0 12px 30px rgba(11, 107, 203, .38);
  transform: translateY(-2px);
}

.btn-ghost {
  background: rgba(255, 255, 255, .06);
  border-color: rgba(255, 255, 255, .42);
  color: #fff;
  backdrop-filter: blur(4px);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, .16);
  color: #fff;
  transform: translateY(-2px);
}

.btn-outline {
  background: #fff;
  border-color: var(--line);
  color: var(--ink);
}
.btn-outline:hover {
  border-color: var(--teal);
  color: var(--teal);
  transform: translateY(-2px);
}

.btn-block { width: 100%; }

/* ==========================================================================
   顶部导航
   ========================================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: transparent;
  transition: background-color .3s var(--ease), box-shadow .3s var(--ease);
}

/* 页面顶部为深色，导航文字用浅色 */
.site-header .brand-text strong,
.site-header .nav a { color: rgba(255, 255, 255, .92); }
.site-header .brand-text small { color: rgba(255, 255, 255, .6); }
.site-header .nav-toggle span { background: #fff; }

.site-header.is-scrolled {
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(14px);
  box-shadow: 0 1px 0 var(--line), 0 6px 24px rgba(11, 31, 47, .06);
}
.site-header.is-scrolled .brand-text strong { color: var(--ink); }
.site-header.is-scrolled .brand-text small { color: var(--ink-3); }
.site-header.is-scrolled .nav a { color: var(--ink-2); }
.site-header.is-scrolled .nav a:hover { color: var(--brand); }
.site-header.is-scrolled .nav a.nav-cta { color: #fff; }
.site-header.is-scrolled .nav-toggle span { background: var(--ink); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.brand-mark { display: block; line-height: 0; }
.brand-mark svg {
  border-radius: 12px;
  box-shadow: 0 6px 16px rgba(4, 24, 42, .28);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 17px; letter-spacing: .02em; }
.brand-text small { font-size: 10px; letter-spacing: .18em; font-weight: 600; }

.nav { display: flex; align-items: center; gap: 6px; }

.nav a {
  position: relative;
  padding: 9px 14px;
  font-size: 15px;
  font-weight: 500;
  border-radius: 8px;
  white-space: nowrap;
  transition: color .2s var(--ease), background-color .2s var(--ease);
}
.nav a::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 3px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .26s var(--ease);
}
.nav a:not(.nav-cta):hover::after,
.nav a[aria-current="page"]:not(.nav-cta)::after { transform: scaleX(1); }

.nav a[aria-current="page"]:not(.nav-cta) { color: var(--brand); font-weight: 600; }
.site-header:not(.is-scrolled) .nav a[aria-current="page"]:not(.nav-cta) { color: #fff; }

.nav a.nav-cta {
  margin-left: 10px;
  padding: 10px 22px;
  background: linear-gradient(120deg, var(--teal), var(--brand));
  color: #fff;
  border-radius: 999px;
  font-weight: 600;
  box-shadow: 0 6px 18px rgba(11, 107, 203, .3);
}
.nav a.nav-cta::after { display: none; }
.nav a.nav-cta:hover { color: #fff; transform: translateY(-1px); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  background: transparent;
  border: 0;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  border-radius: 2px;
  transition: transform .28s var(--ease), opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   首屏（首页）
   ========================================================================== */
.hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 96px) 0 110px;
  background:
    radial-gradient(760px 460px at 88% 6%, rgba(53, 196, 163, .30), transparent 62%),
    radial-gradient(680px 520px at 6% 92%, rgba(11, 107, 203, .34), transparent 66%),
    linear-gradient(158deg, #07304f 0%, var(--deep) 44%, #04182a 100%);
  color: rgba(255, 255, 255, .8);
  isolation: isolate;
}

.hero-bg { position: absolute; inset: 0; z-index: -1; }
.hero-molecule {
  position: absolute;
  top: -8%;
  right: -12%;
  width: min(720px, 78vw);
  height: min(720px, 78vw);
  opacity: .75;
  animation: floaty 26s ease-in-out infinite;
}
@keyframes floaty {
  0%, 100% { transform: translate3d(0, 0, 0) rotate(0deg); }
  50%      { transform: translate3d(-22px, 26px, 0) rotate(4deg); }
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 56px;
  align-items: center;
}

.hero-copy h1 {
  font-size: clamp(32px, 4.6vw, 56px);
  line-height: 1.16;
  color: #fff;
  margin-bottom: 22px;
  letter-spacing: -.02em;
}

.hero .lead {
  font-size: 17.5px;
  max-width: 58ch;
  color: rgba(255, 255, 255, .78);
  margin-bottom: 32px;
}
.hero .lead strong { color: #d7fff5; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 34px;
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  font-size: 14.5px;
  color: rgba(255, 255, 255, .72);
}
.hero-points li { position: relative; padding-left: 20px; }
.hero-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(53, 196, 163, .16);
}

.hero-card {
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .16);
  border-radius: var(--radius-lg);
  padding: 30px 28px;
  backdrop-filter: blur(14px) saturate(150%);
  box-shadow: 0 24px 60px rgba(2, 14, 26, .4);
}
.hero-card h2 {
  font-size: 17px;
  color: #fff;
  letter-spacing: .04em;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, .14);
}

.mini-list { display: grid; gap: 18px; margin-bottom: 22px; }
.mini-list li { display: flex; gap: 13px; align-items: flex-start; }
.mini-list strong { display: block; color: #fff; font-size: 15.5px; margin-bottom: 2px; }
.mini-list small { display: block; font-size: 13px; line-height: 1.6; color: rgba(255, 255, 255, .63); }

.dot { flex: 0 0 auto; width: 11px; height: 11px; margin-top: 8px; border-radius: 50%; }
.dot-a { background: var(--mint); box-shadow: 0 0 0 4px rgba(53, 196, 163, .18); }
.dot-b { background: #6fe3f5; box-shadow: 0 0 0 4px rgba(111, 227, 245, .18); }
.dot-c { background: #9eb6ff; box-shadow: 0 0 0 4px rgba(158, 182, 255, .18); }

.card-link { display: inline-block; font-size: 14.5px; font-weight: 600; color: var(--mint); }
.card-link:hover { color: #fff; }

/* 白色卡片内的链接需要更深的颜色保证对比度 */
.card .card-link { color: var(--teal); }
.card .card-link:hover { color: var(--brand); }

/* ==========================================================================
   子页横幅
   ========================================================================== */
.page-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 76px) 0 78px;
  background:
    radial-gradient(700px 400px at 84% 0%, rgba(53, 196, 163, .26), transparent 60%),
    radial-gradient(620px 460px at 4% 100%, rgba(11, 107, 203, .32), transparent 64%),
    linear-gradient(158deg, #07304f 0%, var(--deep) 48%, #04182a 100%);
  color: rgba(255, 255, 255, .78);
  isolation: isolate;
}
.page-hero::after {
  content: "";
  position: absolute;
  right: -140px;
  top: -120px;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, .07);
  box-shadow:
    0 0 0 60px rgba(255, 255, 255, .028),
    0 0 0 130px rgba(255, 255, 255, .018);
  pointer-events: none;
}
.page-hero h1 {
  font-size: clamp(28px, 4vw, 46px);
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: -.02em;
}
.page-hero .lead {
  font-size: 17px;
  max-width: 66ch;
  margin: 0;
  color: rgba(255, 255, 255, .72);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin-bottom: 18px;
  font-size: 13.5px;
  color: rgba(255, 255, 255, .55);
}
.breadcrumb a { color: rgba(255, 255, 255, .72); }
.breadcrumb a:hover { color: #fff; }
.breadcrumb > * + *::before {
  content: "/";
  margin: 0 10px;
  opacity: .45;
}

/* ==========================================================================
   数据条
   ========================================================================== */
.stats {
  background: var(--deep-2);
  border-top: 1px solid rgba(255, 255, 255, .08);
  padding: 44px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat strong {
  display: block;
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.02em;
  background: linear-gradient(120deg, var(--mint), #7fe6ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat span { display: block; margin-top: 8px; font-size: 13.5px; color: rgba(255, 255, 255, .58); }

/* ==========================================================================
   关于我们
   ========================================================================== */
.about-copy p { font-size: 16.5px; }

.about-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.about-tags span {
  padding: 7px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--teal);
  background: rgba(14, 143, 143, .08);
  border: 1px solid rgba(14, 143, 143, .18);
  border-radius: 999px;
}

.about-panel {
  background: var(--bg-softer);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px 30px;
  box-shadow: var(--shadow-sm);
}
.about-panel h3 {
  font-size: 18px;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.check-list { display: grid; gap: 20px; margin-bottom: 22px; }
.check-list li { position: relative; padding-left: 30px; font-size: 15px; line-height: 1.6; }
.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: rgba(53, 196, 163, .16);
}
.check-list li::after {
  content: "";
  position: absolute;
  left: 5.5px;
  top: 10px;
  width: 5px;
  height: 8px;
  border: solid var(--teal);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.check-list strong { display: block; }
.check-list small { color: var(--ink-3); font-size: 13.5px; }
.check-list li:last-child { margin-bottom: 0; }

/* ==========================================================================
   产品卡片
   ========================================================================== */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
  gap: 24px;
}

.card {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px 30px;
  overflow: hidden;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease),
              border-color .3s var(--ease);
}
.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--teal), var(--brand));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .38s var(--ease);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.card:hover::before { transform: scaleX(1); }

.card-icon {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  margin-bottom: 22px;
  color: var(--teal);
  background: linear-gradient(140deg, rgba(53, 196, 163, .16), rgba(11, 107, 203, .12));
  transition: transform .3s var(--ease), color .3s var(--ease);
}
.card-icon svg { width: 26px; height: 26px; }
.card:hover .card-icon { transform: scale(1.06) rotate(-4deg); color: var(--brand); }

.card h3 { font-size: 19px; margin-bottom: 12px; }
.card p { font-size: 15px; margin-bottom: 20px; }
.card p:last-child { margin-bottom: 0; }

.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-list li {
  font-size: 12.8px;
  padding: 5px 12px;
  border-radius: 8px;
  color: var(--ink-2);
  background: var(--bg-soft);
  border: 1px solid var(--line-soft);
}

.disclaimer {
  margin-top: 36px;
  padding: 18px 22px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-3);
  background: #fff;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
}
.section-soft .disclaimer { background: var(--bg-softer); }

/* ==========================================================================
   服务优势
   ========================================================================== */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.feature { background: #fff; padding: 36px 32px; transition: background-color .3s var(--ease); }
.feature:hover { background: var(--bg-softer); }

.feature-no {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--teal);
  background: rgba(14, 143, 143, .09);
  padding: 3px 11px;
  border-radius: 6px;
  margin-bottom: 18px;
}
.feature h3 { font-size: 18px; margin-bottom: 10px; }
.feature p { font-size: 15px; margin: 0; }

/* ==========================================================================
   质量控制
   ========================================================================== */
.quality-lead {
  font-size: 16.5px;
  color: rgba(255, 255, 255, .74);
  margin-bottom: 32px;
  max-width: 58ch;
}

.quality-list { display: grid; gap: 16px; }
.quality-list li {
  display: grid;
  gap: 3px;
  padding: 15px 20px;
  background: rgba(255, 255, 255, .05);
  border: 1px solid rgba(255, 255, 255, .1);
  border-left: 3px solid var(--mint);
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: background-color .25s var(--ease), transform .25s var(--ease);
}
.quality-list li:hover { background: rgba(255, 255, 255, .09); transform: translateX(4px); }
.quality-list strong { color: #fff; font-size: 15.5px; }
.quality-list span { font-size: 14px; color: rgba(255, 255, 255, .66); }

.quality-panel {
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: var(--radius-lg);
  padding: 32px 30px;
  backdrop-filter: blur(10px);
}
.quality-panel h3 {
  font-size: 17px;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, .14);
}

.spec-table { display: grid; gap: 1px; }
.spec-row {
  display: grid;
  grid-template-columns: 1.1fr 1fr .95fr;
  gap: 12px;
  padding: 12px 6px;
  font-size: 14px;
  color: rgba(255, 255, 255, .74);
  border-bottom: 1px solid rgba(255, 255, 255, .09);
}
.spec-row span:first-child { color: #fff; font-weight: 500; }
.spec-head {
  font-size: 12.5px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .5);
  border-bottom-color: rgba(255, 255, 255, .2);
}
.spec-head span:first-child { color: rgba(255, 255, 255, .5); font-weight: 600; }
.panel-note { margin: 20px 0 0; font-size: 13px; line-height: 1.7; color: rgba(255, 255, 255, .5); }

/* 浅色规格表 */
.table-wrap {
  overflow-x: auto;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.data-table { width: 100%; border-collapse: collapse; font-size: 15px; min-width: 520px; }
.data-table th, .data-table td {
  padding: 15px 20px;
  text-align: left;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}
.data-table thead th {
  font-size: 13px;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--ink-3);
  background: var(--bg-softer);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.data-table tbody tr:last-child td { border-bottom: 0; }
.data-table tbody tr:hover { background: var(--bg-softer); }
.data-table td:first-child { color: var(--ink); font-weight: 500; }

/* ==========================================================================
   合作流程
   ========================================================================== */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
}
.steps li {
  position: relative;
  padding: 30px 24px 26px;
  background: var(--bg-softer);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease),
              background-color .3s var(--ease);
}
.steps li:hover { transform: translateY(-5px); background: #fff; box-shadow: var(--shadow); }
.steps li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -17px;
  width: 10px;
  height: 10px;
  border-top: 2px solid var(--mint);
  border-right: 2px solid var(--mint);
  transform: translateY(-50%) rotate(45deg);
  opacity: .8;
}
.step-no {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  margin-bottom: 18px;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--teal), var(--brand));
  border-radius: 12px;
  box-shadow: 0 6px 16px rgba(11, 107, 203, .24);
}
.steps h3 { font-size: 17px; margin-bottom: 8px; }
.steps p { font-size: 14.5px; margin: 0; }

/* ==========================================================================
   常见问题（details）
   ========================================================================== */
.faq { display: grid; gap: 12px; }
.faq details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}
.faq details[open] { border-color: rgba(14, 143, 143, .35); box-shadow: var(--shadow-sm); }
.faq summary {
  position: relative;
  padding: 18px 54px 18px 22px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "";
  position: absolute;
  right: 24px;
  top: 50%;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--teal);
  border-bottom: 2px solid var(--teal);
  transform: translateY(-70%) rotate(45deg);
  transition: transform .28s var(--ease);
}
.faq details[open] summary::after { transform: translateY(-20%) rotate(-135deg); }
.faq summary:hover { color: var(--teal); }
.faq .faq-body { padding: 0 22px 20px; font-size: 15px; }
.faq .faq-body p:last-child { margin-bottom: 0; }

/* ==========================================================================
   联系我们
   ========================================================================== */
.contact-list { display: grid; gap: 22px; margin: 34px 0 28px; }
.contact-list li { display: flex; gap: 16px; align-items: flex-start; }
.ci {
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: var(--teal);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}
.ci svg { width: 21px; height: 21px; }
.contact-list small { display: block; font-size: 12.5px; color: var(--ink-3); letter-spacing: .04em; }
.contact-list a, .contact-list span:not(.ci) {
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
  word-break: break-all;
}
.contact-list a:hover { color: var(--brand); }

.contact-form {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 34px 32px;
  box-shadow: var(--shadow);
}
.contact-form h3 { font-size: 19px; margin-bottom: 24px; }

.field { margin-bottom: 19px; }
.field label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 7px;
}
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 12px 15px;
  font-family: inherit;
  font-size: 15px;
  color: var(--ink);
  background: var(--bg-softer);
  border: 1px solid var(--line);
  border-radius: 10px;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease),
              background-color .2s var(--ease);
}
.field textarea { resize: vertical; min-height: 104px; line-height: 1.6; }
.field input::placeholder, .field textarea::placeholder { color: #a8bacb; }

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  background: #fff;
  border-color: var(--teal);
  box-shadow: 0 0 0 4px rgba(14, 143, 143, .12);
}

.field.has-error input,
.field.has-error textarea { border-color: var(--danger); background: #fff7f7; }
.field.has-error input:focus,
.field.has-error textarea:focus { box-shadow: 0 0 0 4px rgba(214, 69, 69, .12); }

.err { margin: 6px 0 0; font-size: 13px; color: var(--danger); }

/* 联系方式旁的"复制"小按钮 */
.copy-btn {
  margin-left: 10px;
  padding: 3px 11px;
  font-family: inherit;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--teal);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 7px;
  cursor: pointer;
  vertical-align: middle;
  transition: color .2s var(--ease), background-color .2s var(--ease),
              border-color .2s var(--ease);
}
.copy-btn:hover { border-color: var(--teal); background: var(--bg-soft); }
.copy-btn.is-done {
  color: #fff;
  background: var(--teal);
  border-color: var(--teal);
}
.copy-btn:disabled { cursor: default; }

.form-hint {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-3);
  text-align: center;
}
.form-hint.is-ok { color: var(--teal); font-weight: 500; }
.form-hint.is-bad { color: var(--danger); font-weight: 500; }
.form-hint a { text-decoration: underline; }

/* ==========================================================================
   底部行动条
   ========================================================================== */
.cta-band {
  background:
    radial-gradient(600px 320px at 88% 10%, rgba(53, 196, 163, .26), transparent 62%),
    linear-gradient(140deg, var(--deep) 0%, var(--deep-2) 100%);
  color: rgba(255, 255, 255, .76);
  padding: 62px 0;
}
.cta-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}
.cta-inner h2 { color: #fff; font-size: clamp(22px, 2.6vw, 30px); margin-bottom: 8px; }
.cta-inner p { margin: 0; max-width: 56ch; }
.cta-actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  background: var(--deep-2);
  color: rgba(255, 255, 255, .62);
  padding: 64px 0 28px;
  font-size: 14.5px;
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 44px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}
.footer-brand strong { display: block; font-size: 17px; color: #fff; margin-bottom: 4px; }
.footer-brand small {
  display: block;
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(255, 255, 255, .42);
  margin-bottom: 14px;
}
.footer-brand p { margin: 0; max-width: 46ch; }

.footer-nav, .footer-contact { display: flex; flex-direction: column; gap: 10px; }
.footer-nav strong, .footer-contact strong { font-size: 15px; color: #fff; margin-bottom: 6px; }
.footer-nav a, .footer-contact a { color: rgba(255, 255, 255, .62); }
.footer-nav a:hover, .footer-contact a:hover { color: var(--mint); }

.footer-bottom {
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 32px;
  justify-content: space-between;
  align-items: flex-start;
  font-size: 13px;
  color: rgba(255, 255, 255, .42);
}
.footer-bottom p { margin: 0; }
.footer-disclaimer { max-width: 66ch; line-height: 1.6; }

/* ==========================================================================
   返回顶部
   ========================================================================== */
.to-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 90;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, var(--teal), var(--brand));
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 10px 26px rgba(11, 107, 203, .34);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .3s var(--ease), transform .3s var(--ease);
}
.to-top svg { width: 22px; height: 22px; }
.to-top.is-visible { opacity: 1; transform: translateY(0); }
.to-top:hover { transform: translateY(-3px); }

/* ==========================================================================
   滚动入场动画
   用 animation 而非 transition，避免覆盖卡片自身的 hover 过渡与 transform。
   backwards 填充保证动画结束后交还给常规样式。
   ========================================================================== */
.reveal { opacity: 0; }

.reveal.is-in {
  opacity: 1;
  animation: revealIn .75s var(--ease) backwards;
}

@keyframes revealIn {
  from { opacity: 0; transform: translateY(22px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1024px) {
  .section { padding: 78px 0; }
  .section-tight { padding: 58px 0; }

  .hero-inner { grid-template-columns: 1fr; gap: 44px; }
  .hero-card { max-width: 520px; }

  .split, .split-even { grid-template-columns: 1fr; gap: 44px; }

  .steps { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
  .steps li:not(:last-child)::after { display: none; }

  .footer-grid { grid-template-columns: 1fr 1fr; gap: 34px; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .nav-toggle { display: flex; }

  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 18px 22px;
    background: rgba(255, 255, 255, .98);
    backdrop-filter: blur(16px);
    border-top: 1px solid var(--line);
    box-shadow: 0 18px 40px rgba(11, 31, 47, .14);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .26s var(--ease), transform .26s var(--ease), visibility .26s;
  }
  .nav.is-open { opacity: 1; transform: none; visibility: visible; pointer-events: auto; }

  .nav a,
  .site-header:not(.is-scrolled) .nav a {
    color: var(--ink-2);
    padding: 15px 12px;
    border-bottom: 1px solid var(--line-soft);
    border-radius: 0;
    font-size: 16px;
  }
  .nav a::after { display: none; }
  .nav a[aria-current="page"]:not(.nav-cta),
  .site-header:not(.is-scrolled) .nav a[aria-current="page"]:not(.nav-cta) { color: var(--brand); }

  .nav a.nav-cta,
  .site-header:not(.is-scrolled) .nav a.nav-cta {
    margin: 16px 0 0;
    justify-content: center;
    text-align: center;
    color: #fff;
    border-bottom: 0;
    border-radius: 999px;
  }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 28px 18px; }
  .hero { padding: calc(var(--header-h) + 64px) 0 80px; }
  .hero-molecule { opacity: .45; }
  .features { grid-template-columns: 1fr; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .container { padding: 0 18px; }
  .section { padding: 62px 0; }

  .brand-text strong { font-size: 15.5px; }
  .brand-text small { font-size: 9px; letter-spacing: .12em; }

  .cards { grid-template-columns: 1fr; }
  .card { padding: 26px 22px; }

  .hero-actions .btn { width: 100%; }
  .hero-actions { flex-direction: column; }
  .hero-points { gap: 8px 18px; font-size: 13.5px; }

  .about-panel, .quality-panel, .contact-form { padding: 26px 22px; }

  .spec-row { grid-template-columns: 1fr; gap: 2px; padding: 12px 4px; }
  .spec-head { display: none; }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
  .to-top { right: 16px; bottom: 16px; }

  .cta-actions { width: 100%; }
  .cta-actions .btn { width: 100%; }
}

/* ==========================================================================
   打印 & 动效偏好
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .reveal { opacity: 1; }
  .reveal.is-in { animation: none; }
}

@media print {
  .site-header, .to-top, .hero-bg, .hero-actions, .contact-form, .cta-band { display: none !important; }
  body { color: #000; background: #fff; }
  .hero, .page-hero, .section-dark, .stats, .site-footer { background: #fff !important; color: #000 !important; }
  .hero h1, .page-hero h1, .section-dark h2, .section-dark h3,
  .stat strong, .quality-list strong { color: #000 !important; -webkit-text-fill-color: #000; }
  .reveal { opacity: 1 !important; transform: none !important; }
}