/* ===== 挚飞科技 zhifeitech.com — 新版站点样式 =====
   零依赖、移动端适配、浅色主题 */

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --ink: #0f172a;
  --ink-2: #334155;
  --muted: #64748b;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-alt: #f1f5f9;
  --bg-soft: #f8fafc;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .06), 0 8px 24px rgba(15, 23, 42, .06);
  --shadow-lg: 0 4px 12px rgba(37, 99, 235, .10), 0 16px 40px rgba(15, 23, 42, .10);
}

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

html { scroll-behavior: smooth; }

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

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 860px; }
.mt40 { margin-top: 40px; }
.muted { color: var(--muted); font-size: .95em; }

/* ===== 顶栏 ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }

.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-img { height: 40px; width: auto; display: block; }
.brand-logo {
  width: 36px; height: 36px; border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  color: #fff; font-weight: 800; font-size: 19px;
  display: flex; align-items: center; justify-content: center;
}
.brand-text { font-weight: 700; color: var(--ink); font-size: 17px; display: flex; flex-direction: column; line-height: 1.15; }
.brand-text small { font-weight: 500; color: var(--muted); font-size: 11px; }

.site-nav { display: flex; align-items: center; gap: 22px; }
.site-nav > a { color: var(--ink-2); text-decoration: none; font-size: 15px; font-weight: 500; padding: 6px 0; }
.site-nav > a:hover, .site-nav > a.active { color: var(--primary); }
.nav-toggle {
  display: none; border: 1px solid var(--line); background: #fff;
  font-size: 20px; border-radius: 8px; padding: 4px 12px; cursor: pointer; color: var(--ink-2);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-block; text-decoration: none; font-weight: 600;
  border-radius: 10px; transition: all .18s ease; cursor: pointer; border: none;
}
.btn-primary { background: var(--primary); color: #fff; padding: 10px 22px; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-primary.active { background: var(--primary-dark); }
.btn-ghost { border: 1.5px solid var(--line); color: var(--ink); padding: 10px 22px; background: #fff; }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-light { background: #fff; color: var(--primary); padding: 12px 30px; }
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-lg { padding: 13px 30px; font-size: 16px; }
.btn-sm { padding: 7px 16px; font-size: 14px; }

/* ===== Hero ===== */
.hero {
  padding: 96px 0 72px; text-align: center;
  background:
    radial-gradient(800px 400px at 20% -10%, rgba(37,99,235,.10), transparent),
    radial-gradient(700px 350px at 85% 0%, rgba(124,58,237,.10), transparent),
    var(--bg);
}
.hero-badge {
  display: inline-block; font-size: 13px; font-weight: 600; color: var(--primary);
  background: rgba(37,99,235,.08); border: 1px solid rgba(37,99,235,.18);
  padding: 5px 14px; border-radius: 999px; margin-bottom: 22px;
}
.hero h1 { font-size: clamp(34px, 5.4vw, 56px); line-height: 1.22; letter-spacing: -.5px; }
.hero .grad {
  background: linear-gradient(120deg, var(--primary), #7c3aed);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { max-width: 640px; margin: 22px auto 0; color: var(--ink-2); font-size: 17px; }
.hero-actions { margin-top: 34px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-stats {
  margin: 60px auto 0; display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 16px; max-width: 760px;
}
.hero-stats div {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 8px; box-shadow: var(--shadow);
}
.hero-stats b { display: block; font-size: 26px; color: var(--primary); }
.hero-stats span { font-size: 13px; color: var(--muted); }

/* ===== 区块 ===== */
.section { padding: 76px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head h2 { font-size: clamp(26px, 3.4vw, 34px); letter-spacing: -.3px; }
.section-head .lead { color: var(--muted); margin-top: 8px; font-size: 16px; }

.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

/* ===== 卡片 ===== */
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow); transition: transform .18s ease, box-shadow .18s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.card h3 { font-size: 18px; margin: 12px 0 8px; }
.card p { color: var(--ink-2); font-size: 14.5px; }
.card-icon { font-size: 34px; line-height: 1; }
.card-icon.sm { font-size: 26px; }

/* 通栏高亮卡片（海外独立站） */
.card-wide {
  margin-top: 22px;
  background: linear-gradient(120deg, rgba(37,99,235,.05), rgba(124,58,237,.05)), #fff;
  border: 1px solid rgba(37,99,235,.25);
}
.card-wide-inner { display: flex; gap: 18px; align-items: flex-start; }
.card-wide h3 { margin-top: 0; }
.ticks-inline { display: flex; flex-wrap: wrap; gap: 4px 22px; margin-top: 10px; }
.ticks-inline li { margin: 0; }

.ticks { list-style: none; margin-top: 14px; }
.ticks li {
  padding-left: 24px; position: relative; margin: 7px 0;
  color: var(--ink-2); font-size: 14px;
}
.ticks li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  color: var(--primary); font-weight: 700;
}

/* ===== FDE ===== */
.fde-grid { display: grid; grid-template-columns: 1.6fr 1fr; gap: 26px; align-items: start; }
.fde-copy > p { color: var(--ink-2); font-size: 16px; margin-bottom: 26px; }
.fde-steps { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 30px; }
.step {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; box-shadow: var(--shadow);
}
.step b { display: block; color: var(--primary); font-size: 14px; margin-bottom: 4px; }
.step span { font-size: 13.5px; color: var(--ink-2); }

.fde-side { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.fde-side h3 { font-size: 16px; margin-bottom: 14px; }
.pill-list { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }
.pill-list.wide { margin-top: 14px; }
.pill-list li {
  background: rgba(37,99,235,.07); color: var(--primary);
  border: 1px solid rgba(37,99,235,.15);
  font-size: 13px; font-weight: 500; padding: 5px 13px; border-radius: 999px;
}
.note {
  margin-top: 20px; background: var(--bg-soft); border: 1px dashed var(--line);
  border-radius: 10px; padding: 14px 16px;
}
.note b { font-size: 14px; }
.note p { font-size: 13px; color: var(--ink-2); margin-top: 4px; }

/* ===== 案例 ===== */
.case { position: relative; }
.case h3 { margin-top: 14px; }
.tag {
  display: inline-block; font-size: 12px; font-weight: 600;
  padding: 3px 12px; border-radius: 999px;
}
.tag-ai { background: rgba(124,58,237,.10); color: #7c3aed; }
.tag-data { background: rgba(37,99,235,.10); color: var(--primary); }
.tag-sys { background: rgba(5,150,105,.10); color: #059669; }

/* ===== 页面头 ===== */
.page-hero {
  padding: 64px 0; text-align: center;
  background: radial-gradient(600px 300px at 50% -20%, rgba(37,99,235,.10), transparent), var(--bg-alt);
}
.page-hero h1 { font-size: clamp(28px, 4vw, 40px); }
.page-hero p { color: var(--muted); margin-top: 8px; }

/* ===== 公司介绍 ===== */
.narrow h2 { font-size: 22px; margin: 34px 0 14px; }
.narrow h2:first-child { margin-top: 0; }
.narrow > p { color: var(--ink-2); margin-bottom: 14px; }
.timeline { list-style: none; border-left: 2px solid var(--line); margin: 18px 0 0 6px; }
.timeline li { position: relative; padding: 0 0 22px 24px; }
.timeline li::before {
  content: ""; position: absolute; left: -7px; top: 7px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--primary); border: 2.5px solid #fff; box-shadow: 0 0 0 1.5px var(--primary);
}
.timeline b { color: var(--primary); margin-right: 12px; font-size: 15px; }
.timeline span { color: var(--ink-2); font-size: 14.5px; }

/* ===== 联系页 ===== */
.contact-card { text-align: center; }
.contact-card .big { font-size: 26px; font-weight: 700; color: var(--primary); margin: 6px 0; }
.contact-card h3 { margin-top: 8px; }

/* ===== CTA ===== */
.cta {
  padding: 72px 0; text-align: center; color: #fff;
  background: linear-gradient(120deg, var(--primary), #7c3aed);
}
.cta h2 { font-size: clamp(24px, 3.4vw, 34px); }
.cta p { opacity: .9; margin: 10px 0 28px; }

/* ===== 页脚 ===== */
.site-footer { background: var(--ink); color: #cbd5e1; padding: 56px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 32px; }
.site-footer .brand-text { color: #fff; }
.site-footer h4 { color: #fff; font-size: 14px; margin-bottom: 12px; }
.site-footer a { display: block; color: #94a3b8; text-decoration: none; font-size: 14px; padding: 3px 0; }
.site-footer a:hover { color: #fff; }
.site-footer .muted { color: #94a3b8; }
.footer-legal {
  margin-top: 40px; padding-top: 20px; border-top: 1px solid rgba(148,163,184,.2);
  font-size: 12.5px; color: #94a3b8; text-align: center;
}
.footer-legal .beian-ga { margin-bottom: 6px; }
.footer-legal a {
  display: inline; color: #94a3b8; text-decoration: none; padding: 0;
}
.footer-legal a:hover { color: #fff; }
.footer-legal .beian-ga a { display: inline-block; }
.footer-legal .beian-ga img { float: left; height: 20px; width: auto; }

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .fde-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .fde-steps { grid-template-columns: 1fr; }
  .hero { padding: 64px 0 48px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .nav-toggle { display: block; }
  .site-nav {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: stretch; padding: 14px 24px 20px; gap: 4px;
    box-shadow: var(--shadow-lg);
  }
  .site-nav.open { display: flex; }
  .site-nav > a { padding: 10px 4px; }
  .site-nav > a.btn { text-align: center; margin-top: 8px; }
  .footer-grid { grid-template-columns: 1fr; }
}