/* ============================================================
   北京享元科技有限公司 - 官网样式
   纯静态, 零外部依赖, SEO 友好
   ============================================================ */

:root {
  --primary: #0b1f3a;        /* 深空蓝 - 主色 */
  --primary-light: #16345c;
  --accent: #00c2a8;         /* 青绿 - 强调色 */
  --accent-dark: #00a08a;
  --bg: #ffffff;
  --bg-soft: #f4f7fb;
  --text: #1f2937;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --radius: 10px;
  --shadow: 0 4px 20px rgba(11, 31, 58, 0.08);
  --container: 1140px;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* ---------- 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(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; color: var(--primary); }
.brand:hover { text-decoration: none; }
.brand-logo {
  width: 36px; height: 36px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 18px; font-weight: 800;
}
.brand small { display: block; font-size: 11px; font-weight: 400; color: var(--text-muted); line-height: 1.2; }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a { color: var(--text); font-size: 15px; }
.nav-links a:hover, .nav-links a.active { color: var(--accent-dark); text-decoration: none; font-weight: 600; }
.nav-cta {
  background: var(--accent); color: #fff !important;
  padding: 8px 18px; border-radius: 999px; font-weight: 600;
}
.nav-cta:hover { background: var(--accent-dark); text-decoration: none; }

/* 移动端菜单按钮 */
.nav-toggle { display: none; background: none; border: none; font-size: 26px; cursor: pointer; color: var(--primary); }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 60%, #0f4c5c 100%);
  color: #fff;
  padding: 96px 0 88px;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute; right: -120px; top: -120px;
  width: 420px; height: 420px; border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 194, 168, 0.25), transparent 70%);
}
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; position: relative; z-index: 1; }
.hero h1 { font-size: 44px; line-height: 1.25; font-weight: 800; margin-bottom: 20px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p.lead { font-size: 18px; opacity: 0.92; margin-bottom: 32px; max-width: 520px; }
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 13px 30px; border-radius: 999px;
  font-weight: 600; font-size: 15px; transition: all 0.2s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); text-decoration: none; transform: translateY(-1px); }
.btn-outline { border: 1.5px solid rgba(255, 255, 255, 0.7); color: #fff; }
.btn-outline:hover { background: rgba(255, 255, 255, 0.12); text-decoration: none; }

/* Hero 右侧模拟监控面板 */
.monitor-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 14px;
  padding: 22px;
  backdrop-filter: blur(4px);
}
.monitor-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.monitor-head span { font-size: 13px; opacity: 0.85; }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; }
.dot.green { background: #34d399; }
.dot.yellow { background: #fbbf24; }
.dot.red { background: #f87171; }
.metric-row { display: flex; gap: 12px; margin-bottom: 14px; }
.metric {
  flex: 1; background: rgba(255, 255, 255, 0.07); border-radius: 10px;
  padding: 12px; text-align: center;
}
.metric b { display: block; font-size: 22px; color: var(--accent); }
.metric small { font-size: 12px; opacity: 0.8; }
.bar { height: 8px; background: rgba(255, 255, 255, 0.12); border-radius: 4px; overflow: hidden; margin-bottom: 10px; }
.bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), #4dd0c4); border-radius: 4px; }
.monitor-list li { list-style: none; font-size: 13px; padding: 7px 0; border-bottom: 1px dashed rgba(255,255,255,0.12); display: flex; justify-content: space-between; }
.monitor-list li:last-child { border-bottom: none; }
.monitor-list .ok { color: #34d399; }
.monitor-list .warn { color: #fbbf24; }

/* ---------- 通用区块 ---------- */
.section { padding: 80px 0; }
.section.alt { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-head h2 { font-size: 32px; color: var(--primary); font-weight: 800; margin-bottom: 14px; }
.section-head p { color: var(--text-muted); font-size: 16px; }
.tag {
  display: inline-block; background: rgba(0, 194, 168, 0.12); color: var(--accent-dark);
  font-size: 13px; font-weight: 600; padding: 4px 14px; border-radius: 999px; margin-bottom: 14px;
}

/* 能力卡片 */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow); transition: transform 0.2s;
}
.card:hover { transform: translateY(-4px); }
.card .icon {
  width: 48px; height: 48px; border-radius: 12px; margin-bottom: 16px;
  background: linear-gradient(135deg, rgba(0,194,168,0.15), rgba(11,31,58,0.08));
  display: flex; align-items: center; justify-content: center; font-size: 22px;
}
.card h3 { font-size: 18px; color: var(--primary); margin-bottom: 10px; }
.card p { color: var(--text-muted); font-size: 14.5px; }

/* 数据统计条 */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat b { display: block; font-size: 38px; color: var(--accent-dark); font-weight: 800; }
.stat span { color: var(--text-muted); font-size: 14px; }

/* 双栏特性 */
.feature { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; margin-bottom: 72px; }
.feature:last-child { margin-bottom: 0; }
.feature.reverse .feature-text { order: 2; }
.feature h3 { font-size: 26px; color: var(--primary); margin-bottom: 16px; font-weight: 800; }
.feature p { color: var(--text-muted); margin-bottom: 14px; }
.feature ul { list-style: none; }
.feature ul li { padding: 8px 0 8px 28px; position: relative; color: var(--text); }
.feature ul li::before {
  content: "✓"; position: absolute; left: 0; top: 8px;
  color: var(--accent-dark); font-weight: 700;
}
.feature-visual {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 14px; padding: 32px; color: #fff; min-height: 260px;
  display: flex; align-items: center; justify-content: center; text-align: center;
}
.feature-visual .code-sample {
  font-family: "SF Mono", Menlo, Consolas, monospace; font-size: 13px;
  text-align: left; line-height: 1.9; opacity: 0.95;
}
.feature-visual .code-sample .c { color: #6ee7b7; }
.feature-visual .code-sample .w { color: #fbbf24; }

/* 流程步骤 */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: step; }
.step { position: relative; padding: 24px; background: #fff; border-radius: var(--radius); border: 1px solid var(--border); }
.step::before {
  counter-increment: step; content: "0" counter(step);
  font-size: 30px; font-weight: 800; color: rgba(0, 194, 168, 0.25);
}
.step h4 { margin: 10px 0 8px; color: var(--primary); font-size: 17px; }
.step p { color: var(--text-muted); font-size: 14px; }

/* CTA 横幅 */
.cta-band {
  background: linear-gradient(135deg, var(--accent-dark), var(--accent));
  color: #fff; padding: 56px 0; text-align: center;
}
.cta-band h2 { font-size: 30px; margin-bottom: 12px; }
.cta-band p { opacity: 0.95; margin-bottom: 26px; }
.cta-band .btn-outline { border-color: #fff; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--primary); color: rgba(255,255,255,0.75); padding: 56px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.4fr; gap: 40px; margin-bottom: 40px; }
.footer-grid h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer-grid a { display: block; color: rgba(255,255,255,0.7); font-size: 14px; padding: 4px 0; }
.footer-grid a:hover { color: var(--accent); text-decoration: none; }
.footer-brand p { font-size: 14px; margin-top: 12px; max-width: 300px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12); padding-top: 22px;
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  font-size: 13px; color: rgba(255,255,255,0.5);
}
.footer-bottom a { color: rgba(255,255,255,0.6); }

/* ---------- 页面标题区 ---------- */
.page-hero {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff; padding: 64px 0;
}
.page-hero h1 { font-size: 36px; font-weight: 800; margin-bottom: 10px; }
.page-hero p { opacity: 0.9; max-width: 640px; }
.breadcrumb { font-size: 13px; opacity: 0.75; margin-bottom: 10px; }
.breadcrumb a { color: var(--accent); }

/* ---------- 联系我们 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info h3 { color: var(--primary); font-size: 20px; margin-bottom: 20px; }
.contact-item { display: flex; gap: 14px; margin-bottom: 22px; }
.contact-item .icon { font-size: 22px; }
.contact-item b { display: block; color: var(--primary); }
.contact-item span { color: var(--text-muted); font-size: 15px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; color: var(--primary); }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 14px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 15px; font-family: inherit; background: #fff;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(0,194,168,0.15);
}
.form-group textarea { min-height: 120px; resize: vertical; }
.form-note { font-size: 13px; color: var(--text-muted); margin-top: 10px; }

/* 关于我们 - 团队/价值观 */
.values { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.value {
  text-align: center; padding: 32px 24px; background: #fff;
  border-radius: var(--radius); border: 1px solid var(--border);
}
.value .icon { font-size: 34px; margin-bottom: 14px; }
.value h3 { color: var(--primary); margin-bottom: 8px; font-size: 18px; }
.value p { color: var(--text-muted); font-size: 14px; }

/* 产品价格/版本 */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.plan { background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 32px; text-align: center; }
.plan.featured { border: 2px solid var(--accent); box-shadow: var(--shadow); position: relative; }
.plan.featured .badge {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: var(--accent); color: #fff; font-size: 12px; padding: 3px 14px; border-radius: 999px; font-weight: 600;
}
.plan h3 { color: var(--primary); font-size: 20px; margin-bottom: 8px; }
.plan .price { font-size: 32px; font-weight: 800; color: var(--primary); margin-bottom: 16px; }
.plan .price small { font-size: 14px; color: var(--text-muted); font-weight: 400; }
.plan ul { list-style: none; text-align: left; margin: 20px 0 24px; }
.plan ul li { padding: 7px 0 7px 24px; position: relative; font-size: 14.5px; color: var(--text); }
.plan ul li::before { content: "✓"; position: absolute; left: 0; color: var(--accent-dark); font-weight: 700; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero-grid, .feature, .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .cards, .values, .plans { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links {
    display: none; position: absolute; top: 68px; left: 0; right: 0;
    background: #fff; flex-direction: column; padding: 20px 24px;
    border-bottom: 1px solid var(--border); gap: 18px; align-items: flex-start;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .hero h1 { font-size: 32px; }
  .section-head h2 { font-size: 26px; }
  .feature.reverse .feature-text { order: 0; }
}

@media (max-width: 560px) {
  .steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero { padding: 64px 0; }
}

/* 打印/无障碍 */
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}
.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--primary); color: #fff;
  padding: 8px 16px; z-index: 999;
}
.skip-link:focus { left: 0; }