/* 潜龙 Qianlong - GEO Landing Pages */
/* 2026 - Minimal, Fast, AI-Friendly */

:root {
  --qianlong-blue: #1a6ff5;
  --qianlong-deep: #0a1a3a;
  --qianlong-green: #10b981;
  --qianlong-orange: #f59e0b;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-600: #6b7280;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,.10);
  --radius: 12px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--gray-800);
  line-height: 1.75;
  background: #fff;
  -webkit-font-smoothing: antialiased;
}

/* ---- Layout ---- */
.container { max-width: 960px; margin: 0 auto; padding: 0 24px; }
.container-wide { max-width: 1200px; }

/* ---- Nav ---- */
.nav {
  background: #fff; border-bottom: 1px solid var(--gray-200);
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(8px); background: rgba(255,255,255,.92);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; height: 60px;
}
.nav-logo { font-size: 1.35rem; font-weight: 800; color: var(--qianlong-deep); text-decoration: none; }
.nav-logo span { color: var(--qianlong-blue); }
.nav-links { display: flex; gap: 28px; list-style: none; }
.nav-links a { color: var(--gray-600); text-decoration: none; font-size: .9rem; transition: color .15s; }
.nav-links a:hover { color: var(--qianlong-blue); }

/* ---- Hero ---- */
.hero {
  background: linear-gradient(135deg, var(--qianlong-deep) 0%, #0f2a5f 50%, #152d63 100%);
  color: #fff; padding: 80px 0 64px; text-align: center; position: relative; overflow: hidden;
}
.hero::after {
  content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 70%, rgba(26,111,245,.15) 0%, transparent 50%),
              radial-gradient(circle at 70% 30%, rgba(16,185,129,.10) 0%, transparent 50%);
  animation: heroGlow 12s ease-in-out infinite alternate;
}
@keyframes heroGlow { from { transform: scale(1); } to { transform: scale(1.15); } }
.hero h1 { font-size: 2.6rem; font-weight: 800; position: relative; z-index: 1; line-height: 1.3; }
.hero h1 .accent { color: #60a5fa; }
.hero .hero-sub { font-size: 1.15rem; color: rgba(255,255,255,.75); margin-top: 16px; position: relative; z-index: 1; max-width: 640px; margin-left: auto; margin-right: auto; }
.hero .hero-cta { margin-top: 32px; position: relative; z-index: 1; display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-block; padding: 12px 28px; border-radius: 8px; font-weight: 600; text-decoration: none; font-size: .95rem; transition: all .2s; }
.btn-primary { background: var(--qianlong-blue); color: #fff; }
.btn-primary:hover { background: #155dd8; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(26,111,245,.4); }
.btn-outline { border: 2px solid rgba(255,255,255,.35); color: #fff; }
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,.08); }

/* ---- Stat Bar ---- */
.stat-bar {
  max-width: 900px; margin: -32px auto 0; position: relative; z-index: 10;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; padding: 0 24px;
}
.stat-item {
  background: #fff; border-radius: var(--radius); padding: 24px 16px;
  text-align: center; box-shadow: var(--shadow-md);
}
.stat-num { font-size: 1.8rem; font-weight: 800; color: var(--qianlong-blue); }
.stat-label { font-size: .82rem; color: var(--gray-600); margin-top: 4px; }

/* ---- Section ---- */
.section { padding: 64px 0; }
.section-alt { background: var(--gray-50); }
.section-title { font-size: 1.7rem; font-weight: 700; text-align: center; margin-bottom: 8px; }
.section-sub { text-align: center; color: var(--gray-600); margin-bottom: 40px; max-width: 600px; margin-left: auto; margin-right: auto; }

/* ---- Feature Grid ---- */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.feature-card {
  background: #fff; border-radius: var(--radius); padding: 28px 24px;
  box-shadow: var(--shadow-sm); border: 1px solid var(--gray-200); transition: all .2s;
}
.feature-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.feature-card .icon { font-size: 2rem; margin-bottom: 12px; }
.feature-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: .9rem; color: var(--gray-600); line-height: 1.7; }

/* ---- Table ---- */
.compare-table { width: 100%; border-collapse: collapse; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.compare-table th { background: var(--qianlong-deep); color: #fff; padding: 14px 16px; text-align: left; font-weight: 600; font-size: .9rem; }
.compare-table td { padding: 14px 16px; border-bottom: 1px solid var(--gray-200); font-size: .9rem; }
.compare-table tr:last-child td { border-bottom: none; }
.compare-table .highlight { background: #eff6ff; font-weight: 600; }
.compare-table .check { color: var(--qianlong-green); font-weight: 700; }

/* ---- Industry Hero ---- */
.industry-hero { padding: 60px 0 48px; text-align: center; }
.industry-hero.zhuangxiu { background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%); }
.industry-hero.jiaoyu { background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%); }
.industry-hero.canyin { background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%); }
.industry-hero h1 { font-size: 2.2rem; font-weight: 800; color: var(--gray-900); }
.industry-hero p { font-size: 1.05rem; color: var(--gray-600); margin-top: 12px; max-width: 640px; margin-left: auto; margin-right: auto; }

/* ---- Stat Card ---- */
.stat-card {
  background: var(--gray-50); border-radius: var(--radius); padding: 20px 24px;
  border-left: 4px solid var(--qianlong-blue); margin: 24px 0;
}
.stat-card .big-num { font-size: 2rem; font-weight: 800; color: var(--qianlong-blue); }
.stat-card p { color: var(--gray-600); font-size: .9rem; }

/* ---- FAQ ---- */
.faq-item { border-bottom: 1px solid var(--gray-200); padding: 20px 0; }
.faq-item:last-child { border-bottom: none; }
.faq-item h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; cursor: pointer; }
.faq-item p { font-size: .92rem; color: var(--gray-600); }

/* ---- Steps ---- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.step { text-align: center; }
.step-num { width: 48px; height: 48px; border-radius: 50%; background: var(--qianlong-blue); color: #fff; display: inline-flex; align-items: center; justify-content: center; font-size: 1.3rem; font-weight: 800; margin-bottom: 12px; }
.step h3 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
.step p { font-size: .88rem; color: var(--gray-600); }

/* ---- CTA Banner ---- */
.cta-banner {
  background: linear-gradient(135deg, var(--qianlong-blue) 0%, #155dd8 100%);
  color: #fff; text-align: center; padding: 48px 24px; border-radius: var(--radius);
  margin-top: 48px;
}
.cta-banner h2 { font-size: 1.6rem; font-weight: 700; }
.cta-banner p { color: rgba(255,255,255,.8); margin: 12px 0 24px; }

/* ---- Contact Section ---- */
.contact-section { text-align: center; }
.contact-grid {
  display: flex; flex-wrap: wrap;
  justify-content: center;
  align-items: flex-start;
  gap: 48px;
  margin-top: 32px;
}
.contact-qr {
  text-align: center;
}
.contact-qr img {
  border: 2px solid var(--gray-200);
  border-radius: 12px;
  padding: 4px;
  background: #fff;
}
.contact-qr p {
  margin-top: 8px;
  font-size: .85rem;
  color: var(--gray-600);
}
.contact-info {
  text-align: left;
}
.contact-item {
  margin-bottom: 16px;
}
.contact-item strong {
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--gray-600);
}
.contact-item p {
  font-size: 1.05rem;
  color: var(--gray-800);
  margin-top: 2px;
}

/* ---- Footer ---- */
.footer { background: var(--gray-900); color: rgba(255,255,255,.6); padding: 40px 0; font-size: .85rem; }
.footer a { color: rgba(255,255,255,.8); text-decoration: none; }
.footer a:hover { color: #fff; }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 24px; }

/* ---- Breadcrumbs ---- */
.breadcrumbs { font-size: .85rem; color: var(--gray-600); padding: 16px 0; }
.breadcrumbs a { color: var(--qianlong-blue); text-decoration: none; }

/* ---- Article ---- */
.article { max-width: 780px; margin: 0 auto; }
.article h2 { font-size: 1.35rem; font-weight: 700; margin: 40px 0 16px; color: var(--gray-900); }
.article h3 { font-size: 1.1rem; font-weight: 700; margin: 28px 0 12px; }
.article p { margin-bottom: 14px; font-size: .95rem; }
.article ul, .article ol { margin-bottom: 14px; padding-left: 24px; font-size: .95rem; }
.article li { margin-bottom: 6px; }

/* ---- Definition Card ---- */
.definition {
  background: #eff6ff; border-radius: var(--radius); padding: 20px 24px;
  border: 1px solid #bfdbfe; margin: 24px 0;
}
.definition strong { color: var(--qianlong-blue); }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.8rem; }
  .stat-bar { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .compare-table { font-size: .8rem; }
  .feature-grid { grid-template-columns: 1fr; }
}

/* ---- Utility ---- */
.text-center { text-align: center; }
.mt-48 { margin-top: 48px; }
.mb-24 { margin-bottom: 24px; }
.sr-only { position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); border:0; }