/* ============================================================
   深圳市中科领峰科技有限公司 官网样式
   主色：品牌蓝 #2F318B / 强调红 #E62129（取自公司 logo）
   ============================================================ */

:root {
  --brand: #2f318b;
  --brand-dark: #232466;
  --brand-deep: #1b1c4e;
  --brand-soft: #eceefb;
  --accent: #e62129;
  --accent-dark: #c8171f;
  --ink: #23263d;
  --ink-soft: #5c617e;
  --line: #e6e8f2;
  --bg: #ffffff;
  --bg-alt: #f6f7fc;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(35, 36, 102, 0.08);
  --shadow-lg: 0 18px 50px rgba(35, 36, 102, 0.16);
  --container: 1180px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "微软雅黑", "Hiragino Sans GB",
    "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

.container {
  width: min(var(--container), 92%);
  margin: 0 auto;
}

/* ---------------- 顶部导航 ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand img { height: 44px; width: auto; }

.brand-text { line-height: 1.25; }
.brand-text .cn {
  display: block;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--brand-dark);
  white-space: nowrap;
}
.brand-text .en {
  display: block;
  font-size: 10.5px;
  color: var(--ink-soft);
  letter-spacing: 0.4px;
  white-space: nowrap;
}

.main-nav { display: flex; align-items: center; gap: 34px; }

.main-nav a {
  font-size: 16px;
  color: var(--ink);
  padding: 6px 2px;
  position: relative;
  transition: color 0.2s;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -2px;
  height: 3px;
  border-radius: 2px;
  background: var(--accent);
  transition: right 0.25s ease;
}

.main-nav a:hover { color: var(--brand); }
.main-nav a.active { color: var(--brand); font-weight: 600; }
.main-nav a.active::after,
.main-nav a:hover::after { right: 0; }

.header-phone {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: 999px;
  white-space: nowrap;
  transition: background 0.2s, transform 0.2s;
}
.header-phone:hover { background: var(--accent-dark); transform: translateY(-1px); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
  padding: 10px 9px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--brand-dark);
  transition: transform 0.25s, opacity 0.25s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 32px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s, color 0.2s;
}
.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 20px rgba(230, 33, 41, 0.3);
}
.btn-primary:hover { background: var(--accent-dark); }

.btn-ghost {
  border-color: rgba(255, 255, 255, 0.55);
  color: #fff;
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.12); }

.btn-outline {
  border-color: var(--brand);
  color: var(--brand);
}
.btn-outline:hover { background: var(--brand); color: #fff; }

/* ---------------- 首页 Hero ---------------- */
.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(230, 33, 41, 0.35), transparent 60%),
    radial-gradient(700px 500px at -10% 110%, rgba(98, 128, 255, 0.35), transparent 60%),
    linear-gradient(135deg, #232466 0%, #2f318b 55%, #3a3ca6 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 46px 46px;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 48px;
  padding: 88px 0 96px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  letter-spacing: 3px;
  color: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 999px;
  padding: 6px 18px;
  margin-bottom: 26px;
}

.hero h1 {
  font-size: clamp(34px, 4.6vw, 52px);
  line-height: 1.28;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 20px;
}

.hero h1 em {
  font-style: normal;
  color: #ffb3b6;
}

.hero-desc {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.86);
  max-width: 520px;
  margin-bottom: 36px;
}

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

.hero-visual { position: relative; }

.hero-card {
  position: relative;
  background: rgba(255, 255, 255, 0.97);
  border-radius: 20px;
  padding: 34px 34px 26px;
  box-shadow: 0 30px 70px rgba(10, 12, 50, 0.45);
  transform: rotate(1.5deg);
}

.hero-card img { width: 100%; border-radius: 12px; }

.hero-card figcaption {
  margin-top: 14px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 14px;
}

.hero-badge {
  position: absolute;
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: #fff;
  color: var(--brand-dark);
  border-radius: 14px;
  padding: 12px 18px;
  box-shadow: var(--shadow-lg);
  font-size: 13px;
}
.hero-badge strong { font-size: 16px; color: var(--accent); }

.hero-badge.b1 { top: -18px; left: -26px; transform: rotate(-3deg); }
.hero-badge.b2 { bottom: 22px; right: -20px; transform: rotate(2deg); }

/* ---------------- 数据条 ---------------- */
.stats-band {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 34px 0;
  gap: 20px;
  text-align: center;
}

.stat .num {
  font-size: 38px;
  font-weight: 700;
  color: var(--brand);
  line-height: 1.2;
}
.stat .num small { font-size: 17px; font-weight: 600; margin-left: 2px; }
.stat .label { margin-top: 4px; font-size: 14.5px; color: var(--ink-soft); }

/* ---------------- 通用区块 ---------------- */
.section { padding: 88px 0; }
.section.alt { background: var(--bg-alt); }

.section-head { text-align: center; max-width: 680px; margin: 0 auto 52px; }

.section-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 4px;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 700;
  color: var(--brand-dark);
  letter-spacing: 1px;
  line-height: 1.35;
}

.section-desc { margin-top: 14px; color: var(--ink-soft); font-size: 16px; }

/* ---------------- 关于我们 ---------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.about-text h3 {
  font-size: 24px;
  color: var(--brand-dark);
  margin-bottom: 18px;
  letter-spacing: 1px;
}

.about-text p { color: var(--ink-soft); margin-bottom: 16px; font-size: 15.5px; }

.about-values {
  display: flex;
  gap: 14px;
  margin-top: 26px;
  flex-wrap: wrap;
}

.value-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 9px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--brand-dark);
}

.value-chip i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
}

.tech-cards { display: grid; gap: 22px; }

.tech-card {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand);
  border-radius: var(--radius);
  padding: 26px 28px;
  box-shadow: var(--shadow);
}

.tech-card h4 {
  font-size: 18px;
  color: var(--brand-dark);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.tech-card h4 .ico {
  width: 36px;
  height: 36px;
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 18px;
}

.tech-card p { font-size: 14.5px; color: var(--ink-soft); }

/* ---------------- 产品卡片 ---------------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.product-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s, box-shadow 0.25s;
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.product-card .thumb {
  position: relative;
  background: var(--bg-alt);
  overflow: hidden;
}

.product-card .thumb img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.product-card:hover .thumb img { transform: scale(1.05); }

.product-card .tag {
  position: absolute;
  top: 14px;
  left: 14px;
  background: var(--accent);
  color: #fff;
  font-size: 12.5px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 999px;
  letter-spacing: 1px;
}
.product-card .tag.blue { background: var(--brand); }

.product-card .body { padding: 24px 24px 26px; display: flex; flex-direction: column; flex: 1; }

.product-card h3 {
  font-size: 20px;
  color: var(--brand-dark);
  margin-bottom: 10px;
}

.product-card p { font-size: 14.5px; color: var(--ink-soft); flex: 1; }

.product-card .more {
  margin-top: 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--brand);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.product-card .more:hover { color: var(--accent); }

/* ---------------- 理念 ---------------- */
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.value-card {
  text-align: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 42px 30px;
  transition: transform 0.25s, box-shadow 0.25s;
}
.value-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }

.value-card .ico {
  width: 66px;
  height: 66px;
  margin: 0 auto 20px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), #4b4dc0);
}
.value-card:nth-child(2) .ico { background: linear-gradient(135deg, var(--accent), #f0565c); }

.value-card h3 { font-size: 21px; color: var(--brand-dark); margin-bottom: 10px; letter-spacing: 2px; }
.value-card p { font-size: 14.5px; color: var(--ink-soft); }

/* ---------------- CTA 横幅 ---------------- */
.cta-band {
  background:
    radial-gradient(600px 300px at 90% 0%, rgba(230, 33, 41, 0.35), transparent 60%),
    linear-gradient(120deg, var(--brand-dark), var(--brand));
  color: #fff;
  border-radius: 22px;
  padding: 56px 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.cta-band h2 { font-size: clamp(22px, 2.6vw, 30px); letter-spacing: 1px; margin-bottom: 10px; }
.cta-band p { color: rgba(255, 255, 255, 0.82); font-size: 15.5px; }

.cta-phone {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 1px;
}

/* ---------------- 内页头部 ---------------- */
.page-hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(700px 360px at 90% -20%, rgba(230, 33, 41, 0.32), transparent 60%),
    linear-gradient(120deg, #232466, #2f318b 70%, #3a3ca6);
  padding: 74px 0 66px;
}

.page-hero h1 {
  font-size: clamp(30px, 3.6vw, 40px);
  letter-spacing: 3px;
  margin-bottom: 12px;
}

.page-hero .crumbs {
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.75);
}

.page-hero .crumbs a:hover { color: #fff; }

/* ---------------- 产品详情（产品页） ---------------- */
.product-detail {
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  gap: 56px;
  align-items: center;
}

.product-detail.reverse .pd-media { order: 2; }

.pd-media .frame {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 26px;
  box-shadow: var(--shadow);
}

.pd-media .frame.multi { display: grid; gap: 16px; }

.pd-media .frame img { border-radius: 12px; width: 100%; }

.pd-media figcaption {
  text-align: center;
  margin-top: 12px;
  font-size: 14px;
  color: var(--ink-soft);
}

/* 配套软件界面展示 */
.ui-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 54px;
}

.ui-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px 16px 20px;
  box-shadow: var(--shadow);
  transition: transform 0.25s, box-shadow 0.25s;
}
.ui-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }

.ui-card img {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--line);
}

.ui-card figcaption {
  margin-top: 14px;
  text-align: center;
  font-size: 15px;
  font-weight: 600;
  color: var(--brand-dark);
}
.ui-card figcaption small {
  display: block;
  font-weight: 400;
  font-size: 13px;
  color: var(--ink-soft);
  margin-top: 2px;
}

/* 配色大图 */
.color-hero {
  max-width: 880px;
  margin: 0 auto 38px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px;
  box-shadow: var(--shadow);
}
.color-hero img { width: 100%; border-radius: 10px; }

/* 关于我们场景图 */
.about-scene {
  margin-top: 30px;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.about-scene img { width: 100%; }

.pd-info .pd-tag {
  display: inline-block;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  border-radius: 999px;
  padding: 5px 16px;
  margin-bottom: 16px;
}

.pd-info h2 {
  font-size: clamp(26px, 3vw, 34px);
  color: var(--brand-dark);
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.pd-info .pd-sub { color: var(--accent); font-weight: 600; font-size: 16px; margin-bottom: 16px; }

.pd-info .pd-desc { color: var(--ink-soft); font-size: 15.5px; margin-bottom: 24px; }

.pd-points { display: grid; gap: 12px; margin-bottom: 28px; }

.pd-points li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 15px;
  color: var(--ink);
}

.pd-points li::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  transform: translateY(-2px);
}

/* 功能网格 */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 54px;
}

.feature-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 26px;
  transition: transform 0.25s, box-shadow 0.25s;
}
.feature-item:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }

.feature-item .ico {
  width: 48px;
  height: 48px;
  border-radius: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 23px;
  background: var(--brand-soft);
  color: var(--brand);
  margin-bottom: 16px;
}

.feature-item h3 { font-size: 17.5px; color: var(--brand-dark); margin-bottom: 8px; }
.feature-item p { font-size: 14px; color: var(--ink-soft); }

/* 兼容性条 */
.compat-band {
  margin-top: 46px;
  background: #fff;
  border: 1px dashed #c9cdf0;
  border-radius: var(--radius);
  padding: 22px 30px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px 34px;
  color: var(--ink-soft);
  font-size: 15px;
}

.compat-band strong { color: var(--brand-dark); }
.compat-band .sep { width: 1px; height: 18px; background: var(--line); }
.compat-band .note { font-size: 13px; color: #9aa0bf; }

/* 颜色定制 */
.color-row {
  display: flex;
  flex-wrap: wrap;
  gap: 26px;
  justify-content: center;
  margin-top: 40px;
}

.color-item { text-align: center; width: 86px; }

.color-item .dot {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  margin: 0 auto 10px;
  border: 3px solid #fff;
  box-shadow: 0 4px 14px rgba(35, 36, 102, 0.22);
}

.color-item span { font-size: 13.5px; color: var(--ink-soft); }

/* ---------------- 联系页 ---------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: stretch;
}

.contact-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 44px 46px;
  box-shadow: var(--shadow);
}

.contact-card h3 {
  font-size: 22px;
  color: var(--brand-dark);
  margin-bottom: 26px;
  letter-spacing: 1px;
}

.contact-list { display: grid; gap: 24px; }

.contact-item { display: flex; gap: 16px; align-items: flex-start; }

.contact-item .ico {
  flex: none;
  width: 46px;
  height: 46px;
  border-radius: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 21px;
  background: var(--brand-soft);
  color: var(--brand);
}

.contact-item .label { font-size: 13.5px; color: var(--ink-soft); }
.contact-item .val { font-size: 16.5px; font-weight: 600; color: var(--ink); margin-top: 2px; }
.contact-item .val.phone { color: var(--accent); font-size: 22px; letter-spacing: 1px; }
.contact-item .val a:hover { color: var(--accent-dark); }

.contact-aside {
  display: grid;
  gap: 24px;
}

.quote-card {
  border-radius: 20px;
  padding: 36px 34px;
  color: #fff;
  background: linear-gradient(135deg, var(--brand-dark), var(--brand));
  box-shadow: var(--shadow-lg);
}

.quote-card h3 { font-size: 20px; margin-bottom: 14px; letter-spacing: 1px; }
.quote-card p { font-size: 14.5px; color: rgba(255, 255, 255, 0.85); margin-bottom: 12px; }

.mini-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 30px 34px;
  box-shadow: var(--shadow);
}

.mini-card h4 { font-size: 17px; color: var(--brand-dark); margin-bottom: 10px; }
.mini-card p { font-size: 14.5px; color: var(--ink-soft); }

.big-call {
  margin-top: 8px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  padding: 14px 34px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 1px;
  transition: background 0.2s, transform 0.2s;
}
.big-call:hover { background: var(--accent-dark); transform: translateY(-2px); }

/* ---------------- 页脚 ---------------- */
.site-footer {
  background: var(--brand-deep);
  color: rgba(255, 255, 255, 0.78);
  padding: 64px 0 0;
  margin-top: 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}

.footer-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.footer-brand img { height: 46px; }
.footer-brand .name { color: #fff; font-size: 18px; font-weight: 700; letter-spacing: 1px; }
.footer-brand .en { display: block; font-size: 11px; color: rgba(255,255,255,.55); font-weight: 400; letter-spacing: .3px; }

.site-footer p { font-size: 14px; line-height: 1.8; }

.footer-col h4 {
  color: #fff;
  font-size: 16px;
  letter-spacing: 2px;
  margin-bottom: 18px;
}

.footer-col ul { display: grid; gap: 10px; }
.footer-col a { font-size: 14.5px; transition: color 0.2s; }
.footer-col a:hover { color: #fff; }

.footer-contact li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 14.5px;
}
.footer-contact .k { flex: none; color: rgba(255, 255, 255, 0.5); }

.footer-bar {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

/* ---------------- 回到顶部 ---------------- */
.back-top {
  position: fixed;
  right: 26px;
  bottom: 30px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: none;
  background: var(--brand);
  color: #fff;
  font-size: 19px;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.25s, transform 0.25s, visibility 0.25s, background 0.2s;
  z-index: 90;
}
.back-top.show { opacity: 1; visibility: visible; transform: none; }
.back-top:hover { background: var(--accent); }

/* ---------------- 入场动画 ---------------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.reveal.in { opacity: 1; transform: none; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1020px) {
  .hero-inner { grid-template-columns: 1fr; padding: 60px 0 70px; }
  .hero-visual { max-width: 480px; margin: 0 auto; }
  .about-grid, .product-detail { grid-template-columns: 1fr; gap: 40px; }
  .product-detail.reverse .pd-media { order: 0; }
  .feature-grid, .product-grid, .value-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
}

@media (max-width: 720px) {
  .header-inner { height: 62px; }
  .brand-text .en { display: none; }
  .brand-text .cn { font-size: 16.5px; }
  .brand img { height: 38px; }

  .nav-toggle { display: flex; }
  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-lg);
    padding: 8px 0 14px;
    display: none;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 13px 24px; font-size: 16px; }
  .main-nav a::after { display: none; }
  .header-phone span.txt { display: none; }
  .header-phone { padding: 9px 13px; }

  .hero-inner { padding: 46px 0 58px; }
  .hero-desc { font-size: 15.5px; }
  .hero-badge.b1 { left: -6px; top: -14px; }
  .hero-badge.b2 { right: -6px; }

  .section { padding: 64px 0; }
  .product-grid, .feature-grid, .value-grid { grid-template-columns: 1fr; }
  .ui-grid { grid-template-columns: 1fr; }
  .cta-band { padding: 40px 28px; }
  .contact-card { padding: 34px 26px; }
  .footer-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}