/* ============================================================
   学智通慧智能教学云平台 · 官方网站全局样式
   视觉规范：简约蓝白教育风，正式、干净、高端
   ============================================================ */

:root {
  --primary: #1a56db;
  --primary-dark: #143c9e;
  --primary-light: #e8f0fe;
  --sky: #0ea5e9;
  --sky-light: #e0f2fe;
  --ink: #0b1f3a;
  --ink-2: #334155;
  --muted: #64748b;
  --bg: #ffffff;
  --bg-soft: #f6f9fe;
  --line: #e5ebf5;
  --success: #16a34a;
  --warning: #d97706;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(11, 31, 58, 0.05), 0 4px 14px rgba(11, 31, 58, 0.05);
  --shadow-md: 0 8px 30px rgba(11, 31, 58, 0.08);
  --shadow-lg: 0 20px 50px rgba(11, 31, 58, 0.12);
  --gradient: linear-gradient(135deg, #1a56db 0%, #0ea5e9 100%);
  --gradient-soft: linear-gradient(135deg, #eef4ff 0%, #e0f2fe 100%);
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", -apple-system, "Segoe UI", Roboto, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--ink-2);
  background: var(--bg);
  line-height: 1.7;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .25s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 8px 20px rgba(26, 86, 219, 0.28);
}
.btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(26, 86, 219, 0.36);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
}
.btn-ghost {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(4px);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.22); color: #fff; }
.btn-lg { padding: 14px 36px; font-size: 16px; }
.btn-sm { padding: 8px 18px; font-size: 13px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 24px;
}
.logo { display: flex; align-items: center; gap: 12px; min-width: 0; }
.logo-img { height: 44px; width: auto; display: block; flex: 0 0 auto; }
.logo-icon {
  width: 44px; height: 44px;
  flex: 0 0 44px;
  border-radius: 12px;
  background: var(--gradient);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 6px 16px rgba(26, 86, 219, 0.3);
}
.logo-icon svg { width: 26px; height: 26px; }
.logo-text { display: flex; flex-direction: column; line-height: 1.3; min-width: 0; }
.logo-text strong {
  font-size: 17px;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: .5px;
  white-space: nowrap;
}
.logo-text small {
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.main-nav { display: flex; gap: 4px; }
.main-nav a {
  padding: 8px 18px;
  border-radius: 999px;
  color: var(--ink-2);
  font-weight: 500;
  font-size: 15px;
}
.main-nav a:hover { color: var(--primary); background: var(--primary-light); }
.main-nav a.active {
  color: var(--primary);
  background: var(--primary-light);
  font-weight: 600;
}
.header-actions { display: flex; align-items: center; gap: 14px; }
.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  color: var(--ink);
}
.nav-toggle svg { width: 22px; height: 22px; }

/* ---------- Hero 首页 ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(160deg, #0b1f3a 0%, #10377f 45%, #1660c4 100%);
  color: #fff;
  padding: 96px 0 110px;
}
.hero::before, .hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(10px);
  opacity: .45;
}
.hero::before {
  width: 520px; height: 520px;
  background: radial-gradient(circle, rgba(14, 165, 233, .55), transparent 70%);
  top: -160px; right: -120px;
}
.hero::after {
  width: 420px; height: 420px;
  background: radial-gradient(circle, rgba(56, 189, 248, .4), transparent 70%);
  bottom: -180px; left: -100px;
}
.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 60px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  font-size: 13px;
  color: #dbeafe;
  margin-bottom: 24px;
}
.hero-badge .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #38bdf8;
  box-shadow: 0 0 0 3px rgba(56, 189, 248, .3);
}
.hero-title {
  font-size: 44px;
  line-height: 1.25;
  font-weight: 800;
  color: #fff;
  letter-spacing: 1px;
  margin-bottom: 18px;
}
.hero-title .grad {
  background: linear-gradient(90deg, #7dd3fc, #ffffff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-desc { font-size: 17px; color: #dbeafe; max-width: 560px; margin-bottom: 30px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 18px; }
.hero-note {
  font-size: 12.5px;
  color: #a5c8f5;
  display: flex;
  gap: 8px;
  align-items: flex-start;
  max-width: 560px;
}
.hero-note svg { width: 15px; height: 15px; flex: 0 0 15px; margin-top: 3px; }

.hero-visual { position: relative; z-index: 2; }
.cloud-card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 20px;
  padding: 28px;
  backdrop-filter: blur(12px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.25);
}
.cloud-card-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  margin-bottom: 20px;
}
.cloud-card-head .ic {
  width: 42px; height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, #38bdf8, #2563eb);
  display: flex; align-items: center; justify-content: center;
}
.cloud-card-head .ic svg { width: 22px; height: 22px; }
.cloud-card-head h3 { color: #fff; font-size: 16px; font-weight: 600; }
.cloud-card-head p { color: #9ec3f2; font-size: 12.5px; }
.cloud-status-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.12);
  font-size: 13.5px;
  color: #dbeafe;
}
.cloud-status-row .status {
  display: inline-flex; align-items: center; gap: 6px;
  color: #6ee7b7;
}
.cloud-status-row .status i {
  width: 8px; height: 8px; border-radius: 50%;
  background: #34d399; box-shadow: 0 0 0 3px rgba(52, 211, 153, .25);
}
.cloud-metric {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 18px;
}
.cloud-metric .m {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 14px 10px;
  text-align: center;
}
.cloud-metric .m b { display: block; color: #fff; font-size: 20px; font-weight: 700; }
.cloud-metric .m span { font-size: 12px; color: #9ec3f2; }

/* ---------- 通用区块 ---------- */
.section { padding: 88px 0; }
.section.soft { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 52px; }
.section-tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  letter-spacing: 2px;
  margin-bottom: 14px;
}
.section-title { font-size: 32px; font-weight: 800; color: var(--ink); letter-spacing: 1px; margin-bottom: 14px; }
.section-desc { color: var(--muted); font-size: 14px; }

/* ---------- 能力卡片 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all .3s ease;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity .3s;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  background: var(--gradient-soft);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
}
.feature-icon svg { width: 28px; height: 28px; }
.feature-icon.blue { background: #e0f2fe; }
.feature-icon.indigo { background: #e8f0fe; }
.feature-icon.green { background: #dcfce7; }
.feature-icon.amber { background: #fef3c7; }
.feature-card h3 { font-size: 18px; color: var(--ink); font-weight: 700; margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--muted); }

/* ---------- 序号能力列表 ---------- */
.capability-list { display: grid; grid-template-columns: 1fr; gap: 18px; max-width: 940px; margin: 0 auto; }
.capability-item {
  display: flex;
  gap: 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 28px;
  box-shadow: var(--shadow-sm);
  transition: all .25s;
}
.capability-item:hover { box-shadow: var(--shadow-md); transform: translateX(4px); }
.capability-num {
  flex: 0 0 52px;
  width: 52px; height: 52px;
  border-radius: 14px;
  background: var(--gradient);
  color: #fff;
  font-size: 20px;
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 18px rgba(26, 86, 219, .3);
}
.capability-body h3 { font-size: 17px; color: var(--ink); font-weight: 700; margin-bottom: 6px; }
.capability-body p { font-size: 14.5px; color: var(--muted); }

/* ---------- 合规声明横幅 ---------- */
.legal-banner {
  background: var(--gradient-soft);
  border: 1px solid #d6e4fb;
  border-radius: var(--radius);
  padding: 30px 32px;
  display: flex;
  gap: 18px;
  align-items: flex-start;
}
.legal-banner .seal {
  flex: 0 0 46px;
  width: 46px; height: 46px;
  border-radius: 12px;
  background: var(--gradient);
  display: flex; align-items: center; justify-content: center;
}
.legal-banner .seal svg { width: 24px; height: 24px; }
.legal-banner h4 { color: var(--ink); font-size: 16px; margin-bottom: 6px; }
.legal-banner p { font-size: 13.5px; color: var(--ink-2); }

/* ---------- 内页 Hero ---------- */
.page-hero {
  background: linear-gradient(150deg, #0b1f3a 0%, #10377f 55%, #1660c4 100%);
  color: #fff;
  padding: 72px 0;
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: "";
  position: absolute;
  width: 400px; height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(56, 189, 248, .35), transparent 70%);
  top: -140px; right: -100px;
}
.page-hero .container { position: relative; z-index: 2; }
.page-hero .crumb { font-size: 13px; color: #9ec3f2; margin-bottom: 14px; letter-spacing: 1px; }
.page-hero h1 { font-size: 36px; font-weight: 800; letter-spacing: 1px; margin-bottom: 12px; }
.page-hero p { font-size: 15.5px; color: #dbeafe; max-width: 680px; }

/* ---------- 双栏说明 ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.split-media { position: relative; }
.split-media .frame {
  background: var(--gradient-soft);
  border: 1px solid #d6e4fb;
  border-radius: 20px;
  padding: 40px 32px;
  text-align: center;
  min-height: 300px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.split-media .frame svg { width: 88px; height: 88px; margin-bottom: 18px; }
.split-media .frame b { color: var(--ink); font-size: 18px; display: block; margin-bottom: 6px; }
.split-media .frame span { color: var(--muted); font-size: 13.5px; }

/* ---------- 产品卡 ---------- */
.product-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; }
.product-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all .3s;
  display: flex;
  flex-direction: column;
}
.product-card:hover { box-shadow: var(--shadow-md); transform: translateY(-6px); }
.product-top {
  padding: 28px 28px 0;
  display: flex; justify-content: space-between; align-items: flex-start;
}
.product-tag {
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--primary-light);
  color: var(--primary);
}
.product-tag.green { background: #dcfce7; color: #15803d; }
.product-tag.amber { background: #fef3c7; color: #b45309; }
.product-card .body { padding: 18px 28px 28px; }
.product-card .body h3 { font-size: 19px; color: var(--ink); font-weight: 700; margin-bottom: 10px; }
.product-card .body p { font-size: 14px; color: var(--muted); margin-bottom: 14px; }
.check-list li {
  display: flex; gap: 8px;
  font-size: 13.5px; color: var(--ink-2);
  padding: 4px 0;
}
.check-list svg { width: 17px; height: 17px; flex: 0 0 17px; color: var(--success); margin-top: 4px; }

/* ---------- 优势条 ---------- */
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.adv-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 22px;
  text-align: center;
  transition: all .3s;
}
.adv-item:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.adv-item .ic {
  width: 52px; height: 52px;
  margin: 0 auto 14px;
  border-radius: 50%;
  background: var(--gradient-soft);
  display: flex; align-items: center; justify-content: center;
}
.adv-item .ic svg { width: 26px; height: 26px; }
.adv-item b { display: block; color: var(--ink); font-size: 15.5px; margin-bottom: 6px; }
.adv-item span { font-size: 13px; color: var(--muted); }

/* ---------- 合规卡片 ---------- */
.compliance-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.compliance-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 28px;
  box-shadow: var(--shadow-sm);
  transition: all .3s;
  display: flex;
  gap: 20px;
  align-items: flex-start;
}
.compliance-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.compliance-card .ic {
  flex: 0 0 54px;
  width: 54px; height: 54px;
  border-radius: 14px;
  background: var(--gradient-soft);
  display: flex; align-items: center; justify-content: center;
}
.compliance-card .ic svg { width: 28px; height: 28px; }
.compliance-card h3 { font-size: 17px; color: var(--ink); margin-bottom: 8px; }
.compliance-card p { font-size: 13.5px; color: var(--muted); margin-bottom: 12px; }
.placeholder-cert {
  border: 2px dashed #c7d8f5;
  background: #f6f9fe;
  border-radius: 10px;
  padding: 16px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}
.doc-list { margin-top: 12px; }
.doc-list a {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 0;
  font-size: 13.5px;
  border-bottom: 1px dashed var(--line);
}
.doc-list a:last-child { border-bottom: none; }
.doc-list svg { width: 16px; height: 16px; flex: 0 0 16px; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
  overflow: hidden;
  transition: box-shadow .3s;
}
.faq-item.open { box-shadow: var(--shadow-md); }
.faq-q {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  text-align: left;
}
.faq-q .icon {
  flex: 0 0 26px;
  width: 26px; height: 26px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  transition: transform .3s;
}
.faq-item.open .faq-q .icon { transform: rotate(45deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease;
  padding: 0 22px;
  color: var(--muted);
  font-size: 14px;
}
.faq-item.open .faq-a { max-height: 400px; padding-bottom: 20px; }

/* ---------- 联系卡片 ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.contact-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 26px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.contact-card .ic {
  width: 54px; height: 54px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: var(--gradient-soft);
  display: flex; align-items: center; justify-content: center;
}
.contact-card .ic svg { width: 26px; height: 26px; }
.contact-card h3 { font-size: 16px; color: var(--ink); margin-bottom: 8px; }
.contact-card p { font-size: 13.5px; color: var(--muted); }

/* ---------- 步骤条 ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; counter-reset: step; }
.step-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 26px;
  position: relative;
  box-shadow: var(--shadow-sm);
}
.step-card .num {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  font-size: 18px;
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
}
.step-card h3 { font-size: 16px; color: var(--ink); margin-bottom: 8px; }
.step-card p { font-size: 13.5px; color: var(--muted); }

/* ---------- 表格 ---------- */
.simple-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius-sm); overflow: hidden; box-shadow: var(--shadow-sm); }
.simple-table th, .simple-table td { padding: 14px 18px; text-align: left; font-size: 14px; border-bottom: 1px solid var(--line); }
.simple-table th { background: var(--primary-light); color: var(--ink); font-weight: 600; }
.simple-table tr:last-child td { border-bottom: none; }
.simple-table td:first-child { color: var(--ink); font-weight: 600; white-space: nowrap; }

/* ---------- 文档页排版 ---------- */
.doc-page { padding: 60px 0 90px; }
.doc-shell {
  max-width: 860px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 56px 60px;
}
.doc-shell h1 { font-size: 28px; color: var(--ink); text-align: center; margin-bottom: 6px; letter-spacing: 1px; }
.doc-shell .doc-meta { text-align: center; color: var(--muted); font-size: 13.5px; margin-bottom: 34px; }
.doc-shell h2 { font-size: 19px; color: var(--ink); margin: 30px 0 14px; padding-left: 14px; border-left: 4px solid var(--primary); }
.doc-shell h3 { font-size: 16px; color: var(--ink); margin: 20px 0 10px; }
.doc-shell p { font-size: 14.5px; color: var(--ink-2); margin-bottom: 12px; text-align: justify; }
.doc-shell ol, .doc-shell ul { margin: 0 0 14px 22px; }
.doc-shell li { font-size: 14.5px; color: var(--ink-2); margin-bottom: 8px; text-align: justify; }
.doc-shell ol { list-style: decimal; }
.doc-shell ul { list-style: disc; }
.doc-sign {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 14.5px;
  color: var(--ink);
  text-align: right;
}
.doc-back { text-align: center; margin-top: 26px; }
.notice-box {
  background: #fefce8;
  border: 1px solid #fde68a;
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 13.5px;
  color: #854d0e;
  margin: 20px 0;
  display: flex; gap: 10px; align-items: flex-start;
}
.notice-box svg { width: 18px; height: 18px; flex: 0 0 18px; margin-top: 2px; }

/* ---------- CTA 条 ---------- */
.cta-band {
  background: var(--gradient);
  border-radius: 20px;
  padding: 48px 56px;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-lg);
}
.cta-band h3 { font-size: 26px; font-weight: 800; margin-bottom: 8px; letter-spacing: 1px; }
.cta-band p { color: #dbeafe; font-size: 14.5px; max-width: 620px; }
.cta-band .btn { background: #fff; color: var(--primary); }
.cta-band .btn:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18); }

/* ---------- 页脚 ---------- */
.site-footer {
  background: #0b1f3a;
  color: #9eb3d6;
  font-size: 13.5px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding: 60px 0 40px;
}
.footer-col h4 { color: #fff; font-size: 15.5px; margin-bottom: 18px; font-weight: 600; }
.footer-col p { color: #9eb3d6; line-height: 1.9; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a { color: #9eb3d6; }
.footer-col ul a:hover { color: #fff; }
.footer-logo { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.footer-logo .ic {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--gradient);
  display: flex; align-items: center; justify-content: center;
}
.footer-logo .ic svg { width: 22px; height: 22px; }
.footer-logo b { color: #fff; font-size: 16px; }
.footer-declare {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 24px 0;
  font-size: 12.5px;
  color: #7e93b8;
  line-height: 1.9;
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 0 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  align-items: center;
  justify-content: space-between;
  font-size: 12.5px;
  color: #7e93b8;
}
.footer-bottom a { color: #9eb3d6; }
.footer-bottom a:hover { color: #fff; }
.footer-bottom .icp { display: inline-flex; align-items: center; gap: 6px; }
.footer-bottom .icp img { width: 14px; height: 14px; display: block; }
.footer-bottom .icp a { line-height: 1.2; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-title { font-size: 36px; }
  .feature-grid, .product-grid, .contact-grid, .steps { grid-template-columns: 1fr 1fr; }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .compliance-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 820px) {
  .nav-toggle { display: flex; }
  .main-nav {
    position: fixed;
    top: 76px; left: 0; right: 0;
    flex-direction: column;
    background: #fff;
    padding: 16px 24px 24px;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
    gap: 4px;
    transform: translateY(-120%);
    transition: transform .3s ease;
    z-index: 99;
  }
  .main-nav.open { transform: translateY(0); }
  .main-nav a { padding: 12px 16px; }
  .header-actions .btn-sm { display: none; }
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero { padding: 64px 0 80px; }
  .hero-title { font-size: 30px; }
  .hero-visual { max-width: 440px; }
  .section { padding: 64px 0; }
  .section-title { font-size: 26px; }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .cta-band { padding: 36px 30px; }
  .doc-shell { padding: 36px 26px; }
  .capability-item { flex-direction: column; }
}
@media (max-width: 600px) {
  .feature-grid, .product-grid, .contact-grid, .steps, .adv-grid, .compliance-grid, .footer-grid { grid-template-columns: 1fr; }
  .logo-text strong { font-size: 15px; }
  .logo-text small { display: none; }
  .cloud-metric { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .doc-shell h1 { font-size: 22px; }
}

/* ---------- 动效 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- 其他 ---------- */
.text-center { text-align: center; }
.mt-40 { margin-top: 40px; }
.mt-56 { margin-top: 56px; }
.mb-24 { margin-bottom: 24px; }

/* ============================================================
 * 资质证书 · 点击全屏查看大图（Lightbox）
 * ============================================================ */
.cert-zoom {
  position: relative;
  display: block;
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
  padding: 0;
  border: none;
  background: none;
  cursor: zoom-in;
  text-align: left;
  overflow: hidden;
  border-radius: 8px;
  box-shadow: 0 6px 20px rgba(15, 60, 150, 0.14);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.cert-zoom:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(15, 60, 150, 0.22);
}
.cert-zoom img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
}
.cert-zoom-hint {
  position: absolute;
  right: 10px;
  bottom: 10px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(12, 30, 66, 0.7);
  color: #fff;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.3px;
  pointer-events: none;
  backdrop-filter: blur(2px);
}
.cert-zoom-hint svg { width: 14px; height: 14px; flex: 0 0 auto; }

/* Lightbox 遮罩 */
.lightbox-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(5, 10, 22, 0.93);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.28s ease, visibility 0.28s ease;
}
.lightbox-overlay.show { opacity: 1; visibility: visible; }
.lightbox-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  max-width: 94vw;
  max-height: 90vh;
}
.lightbox-stage img {
  display: block;
  max-width: 94vw;
  max-height: 90vh;
  width: auto;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 14px 70px rgba(0, 0, 0, 0.55);
}
.lightbox-close {
  position: absolute;
  top: 18px;
  right: 22px;
  width: 46px;
  height: 46px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 32px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}
.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.28);
  transform: rotate(90deg);
}
.lightbox-load {
  position: absolute;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  margin: 0;
  color: rgba(255, 255, 255, 0.8);
  font-size: 13px;
  letter-spacing: 0.4px;
}
body.lightbox-open { overflow: hidden; }