/* ============ 基础 ============ */
:root {
  --navy: #16385f;
  --blue: #1d4e89;
  --blue-2: #2f6cb3;
  --ink: #26313d;
  --muted: #5c6b7a;
  --line: #e3e9f0;
  --bg-alt: #f4f7fb;
  --gold: #c8a24b;
  --radius: 8px;
  --shadow: 0 6px 24px rgba(22, 56, 95, .08);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.75;
  font-size: 16px;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* ============ 顶部导航 ============ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--navy); font-size: 17px; }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 6px;
  background: var(--blue); color: #fff; font-size: 14px; font-weight: 700; letter-spacing: .5px;
}
.main-nav { display: flex; align-items: center; gap: 28px; font-size: 15px; color: var(--muted); }
.main-nav a:hover { color: var(--blue); }
.main-nav .nav-cta {
  color: var(--blue); font-weight: 600;
  border: 1px solid var(--blue); border-radius: 4px; padding: 5px 14px;
}
.main-nav .nav-cta:hover { background: var(--blue); color: #fff; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--navy); margin: 4px 0; }

/* ============ 首屏 ============ */
.hero {
  background:
    radial-gradient(1000px 420px at 82% -10%, rgba(47,108,179,.35), transparent 60%),
    linear-gradient(135deg, #122c4c 0%, #16385f 55%, #1d4e89 100%);
  color: #fff;
  padding: 84px 0 92px;
}
.hero-inner { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.hero-eyebrow {
  display: inline-block; font-size: 13px; letter-spacing: 4px;
  color: #bcd2ec; border: 1px solid rgba(255,255,255,.25);
  padding: 4px 14px; border-radius: 20px; margin-bottom: 22px;
}
.hero h1 { font-size: 42px; letter-spacing: 2px; margin-bottom: 18px; }
.hero-sub { font-size: 16.5px; color: #cddcf0; max-width: 34em; margin-bottom: 30px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 38px; }
.btn { display: inline-block; padding: 11px 26px; border-radius: 4px; font-size: 15px; transition: all .2s; }
.btn-primary { background: var(--gold); color: #1d2430; font-weight: 600; }
.btn-primary:hover { background: #d7b360; }
.btn-ghost { border: 1px solid rgba(255,255,255,.4); color: #fff; }
.btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,.08); }
.hero-stats { display: flex; gap: 40px; flex-wrap: wrap; }
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 26px; font-weight: 700; color: #fff; }
.hero-stats strong i { font-style: normal; font-size: 15px; margin-left: 2px; color: #bcd2ec; }
.hero-stats span { font-size: 13px; color: #9fb8d8; }

.hero-visual { filter: drop-shadow(0 24px 48px rgba(0,0,0,.35)); }
.browser-frame {
  background: #fff; border-radius: 8px; overflow: hidden;
  border: 1px solid rgba(255,255,255,.2);
}
.browser-bar { display: flex; gap: 6px; padding: 9px 12px; background: #e8edf3; }
.browser-bar i { width: 9px; height: 9px; border-radius: 50%; background: #c4cfdb; }
.browser-bar i:first-child { background: #e08a8a; }
.browser-bar i:nth-child(2) { background: #e2c48a; }
.browser-bar i:nth-child(3) { background: #8fca9b; }
.browser-frame svg { display: block; }

/* ============ 通用段落 ============ */
.section { padding: 88px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { max-width: 860px; margin-bottom: 52px; }
.section-eyebrow {
  font-size: 13px; letter-spacing: 3px; color: var(--blue-2);
  font-weight: 600; margin-bottom: 10px;
}
.section-head h2 { font-size: 30px; color: var(--navy); margin-bottom: 16px; letter-spacing: 1px; }
.section-desc { color: var(--muted); font-size: 16px; }

/* ============ 痛点卡片 ============ */
.pain-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.pain-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 24px; transition: box-shadow .2s, transform .2s;
}
.pain-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.pain-card h3 {
  font-size: 17px; color: var(--navy); margin-bottom: 10px;
  padding-left: 12px; border-left: 3px solid var(--blue);
}
.pain-card p { font-size: 14.5px; color: var(--muted); }

/* ============ 架构分层 ============ */
.arch-stack { display: flex; flex-direction: column; gap: 14px; }
.arch-layer {
  display: grid; grid-template-columns: 150px 1fr; align-items: stretch;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
}
.arch-label {
  display: flex; align-items: center; justify-content: center;
  background: var(--navy); color: #fff; font-size: 15px; font-weight: 600; letter-spacing: 1px;
  padding: 12px;
}
.arch-items { display: flex; flex-wrap: wrap; gap: 10px; padding: 16px 18px; align-items: center; }
.arch-items span {
  background: #edf3fa; color: var(--navy); border: 1px solid #d5e2f0;
  font-size: 14px; padding: 6px 16px; border-radius: 4px;
}

/* ============ 功能展示 ============ */
.feature-row {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 52px; align-items: center;
  padding: 44px 0;
}
.feature-row + .feature-row { border-top: 1px solid var(--line); }
.feature-row-reverse .feature-media { order: 2; }
.feature-row-reverse .feature-body { order: 1; }
.feature-body h3 { font-size: 24px; color: var(--navy); margin-bottom: 14px; }
.feature-body > p { color: var(--muted); font-size: 15.5px; margin-bottom: 18px; }
.feature-list li {
  position: relative; padding-left: 22px; margin-bottom: 9px;
  font-size: 15px; color: var(--ink);
}
.feature-list li::before {
  content: ""; position: absolute; left: 0; top: 11px;
  width: 8px; height: 8px; border-radius: 2px; background: var(--blue-2);
}
.media-frame {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
}
.media-frame img { width: 100%; height: auto; }
.media-group { display: flex; flex-direction: column; gap: 18px; }
.media-group .media-frame { box-shadow: none; }
.media-group .media-frame:first-child { box-shadow: var(--shadow); }

/* 更多功能 */
.sub-features { margin-top: 30px; border-top: 1px solid var(--line); padding-top: 44px; }
.sub-features-title { font-size: 21px; color: var(--navy); margin-bottom: 26px; }
.sub-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.sub-card {
  background: var(--bg-alt); border-radius: var(--radius); padding: 24px 22px;
  border: 1px solid transparent; transition: all .2s;
}
.sub-card:hover { background: #fff; border-color: var(--line); box-shadow: var(--shadow); }
.sub-card h4 { font-size: 16.5px; color: var(--navy); margin-bottom: 8px; }
.sub-card p { font-size: 14px; color: var(--muted); }

/* ============ 安全 ============ */
.section-dark { background: linear-gradient(160deg, #122c4c, #16385f); color: #fff; }
.section-dark .section-eyebrow { color: #9fc0e8; }
.section-dark .section-head h2 { color: #fff; }
.section-dark .section-desc { color: #b9cde6; }
.sec-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.sec-card {
  background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.14);
  border-radius: var(--radius); padding: 28px 24px;
}
.sec-card h3 {
  font-size: 18px; margin-bottom: 16px; padding-bottom: 12px;
  border-bottom: 1px solid rgba(255,255,255,.15);
}
.sec-card li {
  position: relative; padding-left: 18px; margin-bottom: 10px;
  font-size: 14px; color: #c8d8ec;
}
.sec-card li::before {
  content: ""; position: absolute; left: 0; top: 9px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--gold);
}

/* ============ 信创 ============ */
.xinchuang-row { display: grid; grid-template-columns: 1fr 1fr; gap: 52px; align-items: center; }
.media-frame-tall { align-self: start; }
.xc-item {
  border-left: 3px solid var(--blue); padding: 4px 0 4px 18px; margin-bottom: 24px;
}
.xc-item h4 { font-size: 17px; color: var(--navy); margin-bottom: 4px; }
.xc-item p { color: var(--muted); font-size: 15px; }
.xc-note { font-size: 13px; color: #8a97a5; margin-top: 8px; }

/* ============ 案例 ============ */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.case-card {
  background: #fff; border: 1px solid var(--line); border-top: 3px solid var(--blue);
  border-radius: var(--radius); padding: 28px 24px; transition: box-shadow .2s;
}
.case-card:hover { box-shadow: var(--shadow); }
.case-tag {
  display: inline-block; font-size: 12.5px; color: var(--blue-2);
  background: #edf3fa; padding: 3px 12px; border-radius: 12px; margin-bottom: 14px;
}
.case-card h3 { font-size: 18px; color: var(--navy); margin-bottom: 12px; }
.case-card > p:last-child { font-size: 14.5px; color: var(--muted); }

/* ============ 页脚 ============ */
.site-footer { background: #10233c; color: #a8bcd4; }
.footer-inner {
  display: grid; grid-template-columns: 1.2fr 1fr .7fr; gap: 44px;
  padding: 56px 24px 44px;
}
.footer-intro h3 { color: #fff; font-size: 19px; margin-bottom: 12px; }
.footer-intro p { font-size: 14px; }
.footer-col h4 { color: #fff; font-size: 15.5px; margin-bottom: 14px; letter-spacing: 1px; }
.contact-list li { display: flex; gap: 12px; font-size: 14px; margin-bottom: 10px; }
.contact-list span { color: #6f88a6; flex-shrink: 0; }
.footer-nav li { margin-bottom: 8px; font-size: 14px; }
.footer-nav a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 16px 0; font-size: 13px; color: #6f88a6; }

/* ============ 响应式 ============ */
@media (max-width: 980px) {
  .hero-inner, .feature-row, .xinchuang-row { grid-template-columns: 1fr; gap: 36px; }
  .feature-row-reverse .feature-media { order: 0; }
  .pain-grid, .sub-grid, .sec-grid, .case-grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 34px; }
  .footer-inner { grid-template-columns: 1fr; gap: 30px; }
}
@media (max-width: 640px) {
  .pain-grid, .sub-grid, .sec-grid, .case-grid { grid-template-columns: 1fr; }
  .arch-layer { grid-template-columns: 1fr; }
  .arch-label { padding: 8px 12px; }
  .section { padding: 60px 0; }
  .main-nav {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: #fff; flex-direction: column; gap: 0;
    border-bottom: 1px solid var(--line); padding: 8px 0;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 24px; width: 100%; }
  .nav-toggle { display: block; }
}