:root{
  --primary:#0f2557;
  --primary-light:#1a3a7a;
  --accent:#c8a45c;
  --accent-light:#e4c88a;
  --bg:#f8f9fb;
  --card:#fff;
  --text:#1f2937;
  --muted:#6b7280;
  --border:#e5e7eb;
  --shadow:0 4px 20px rgba(15,37,87,.08);
  --radius:12px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);background:#fff;line-height:1.6}
a{color:var(--primary);text-decoration:none}
img{max-width:100%;height:auto;display:block}
.container{width:min(1160px,92vw);margin:0 auto;padding:0 16px}

/* Header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:70px}
.logo{display:flex;align-items:center;gap:10px}
.logo img{height:46px;width:auto;border-radius:6px}
.logo span{font-size:18px;font-weight:700;color:var(--primary);line-height:1.2}
.main-nav ul{display:flex;gap:28px;list-style:none;margin:0;padding:0}
.main-nav a{font-size:15px;font-weight:500;color:var(--text);position:relative}
.main-nav a:hover,.main-nav a.active{color:var(--primary)}
.main-nav a.active::after{content:"";position:absolute;bottom:-22px;left:0;width:100%;height:3px;background:var(--accent)}
.header-contact{display:flex;align-items:center;gap:12px}
.phone-block{display:flex;align-items:center;gap:8px}
.phone-label{font-size:11px;color:var(--muted);background:var(--bg);padding:3px 7px;border:1px solid var(--border);border-radius:4px;line-height:1;white-space:nowrap}
.phone-number{font-size:16px;font-weight:700;color:var(--primary);white-space:nowrap;letter-spacing:.5px}
.phone-number:hover{color:var(--primary-light)}
.btn{padding:10px 20px;border-radius:6px;font-size:14px;font-weight:600;display:inline-block;transition:.2s}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-light)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:#b08d4b}
.btn-outline{border:2px solid var(--primary);color:var(--primary);background:transparent}
.btn-outline:hover{background:var(--primary);color:#fff}

/* Hero */
.hero{position:relative;min-height:520px;display:flex;align-items:center;color:#fff;background:var(--primary);overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.35}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(90deg,rgba(15,37,87,.92) 0%,rgba(15,37,87,.65) 60%,transparent 100%);z-index:1}
.hero .container{position:relative;z-index:2}
.hero h1{font-size:42px;font-weight:700;line-height:1.25;margin:0 0 16px;max-width:720px}
.hero p{font-size:18px;color:rgba(255,255,255,.9);max-width:620px;margin:0 0 28px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}

/* Section */
.section{padding:72px 0}
.section-title{text-align:center;margin-bottom:42px}
.section-title h2{font-size:30px;color:var(--primary);margin:0 0 10px}
.section-title p{color:var(--muted);font-size:16px;margin:0}

/* Stats */
.stats-bar{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:28px}
.stat-card{background:rgba(255,255,255,.1);backdrop-filter:blur(4px);border:1px solid rgba(255,255,255,.2);border-radius:var(--radius);padding:20px;text-align:center;color:#fff}
.stat-number{font-size:32px;font-weight:700;color:var(--accent)}
.stat-label{font-size:13px;margin-top:4px;opacity:.9}

/* Split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split h3{font-size:26px;color:var(--primary);margin:0 0 16px}
.split p{color:var(--muted);margin:0 0 16px}
.split img{border-radius:var(--radius);box-shadow:var(--shadow)}
/* 师资卡片（多位老师） */
.teacher-card{padding:36px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:32px}
.teacher-card .teacher-photo img{width:100%;max-width:420px;margin:0 auto}
.teacher-card-reverse .teacher-photo{order:2}
.teacher-card-reverse .teacher-info{order:1}
.teacher-tags{display:flex;flex-wrap:wrap;gap:8px}
.teacher-tags .course-tag{margin-bottom:0}

/* Services */
.services-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.service-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:28px 22px;transition:.2s}
.service-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--accent-light)}
.service-icon{color:var(--accent);margin-bottom:14px}
.service-card h3{font-size:18px;color:var(--primary);margin:0 0 10px}
.service-card p{font-size:14px;color:var(--muted);margin:0 0 16px;min-height:88px}
.btn-link{font-size:14px;font-weight:600;color:var(--accent)}

/* Why */
.why-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.why-card{background:var(--bg);border-radius:var(--radius);padding:24px;border-left:4px solid var(--accent)}
.why-card h4{font-size:18px;color:var(--primary);margin:0 0 8px}
.why-card p{font-size:14px;color:var(--muted);margin:0}

/* Cases */
.cases-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.case-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.case-image{aspect-ratio:16/10;overflow:hidden}
.case-image img{width:100%;height:100%;object-fit:cover}
.case-card h4{font-size:17px;color:var(--primary);padding:16px 16px 8px;margin:0}
.case-card p{font-size:14px;color:var(--muted);padding:0 16px 16px;margin:0}

/* CTA */
.cta{position:relative;color:#fff;padding:90px 0;text-align:center;background:var(--primary);overflow:hidden}
.cta-bg{position:absolute;inset:0;z-index:0}
.cta-bg img{width:100%;height:100%;object-fit:cover;opacity:.25}
.cta-overlay{position:absolute;inset:0;background:rgba(15,37,87,.88);z-index:1}
.cta .container{position:relative;z-index:2}
.cta h2{font-size:30px;margin:0 0 12px}
.cta p{font-size:17px;margin:0 0 22px;opacity:.9}

/* Footer */
.site-footer{background:var(--primary);color:rgba(255,255,255,.8);padding:56px 0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px}
.footer-brand h3{color:#fff;margin:0 0 12px;font-size:20px}
.footer-brand p{font-size:14px;line-height:1.7;opacity:.85;margin:0}
.footer-col h4{color:#fff;margin:0 0 14px;font-size:16px}
.footer-col a{display:block;color:rgba(255,255,255,.75);font-size:14px;margin-bottom:8px}
.footer-col a:hover{color:var(--accent-light)}
.footer-qr img{max-width:120px;border-radius:8px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.15);margin-top:36px;padding-top:20px;display:flex;justify-content:space-between;align-items:center;font-size:13px;opacity:.8}
.footer-bottom a{color:rgba(255,255,255,.8);text-decoration:none}
.footer-bottom a:hover{color:#fff;text-decoration:underline}

/* Page hero */
.page-hero{position:relative;min-height:280px;display:flex;align-items:center;color:#fff;background:var(--primary)}
.page-hero-bg{position:absolute;inset:0;z-index:0}
.page-hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.3}
.page-hero-overlay{position:absolute;inset:0;background:rgba(15,37,87,.82);z-index:1}
.page-hero .container{position:relative;z-index:2}
.page-hero h1{font-size:34px;margin:0 0 8px}
.page-hero p{font-size:16px;opacity:.9;margin:0}
.breadcrumbs{list-style:none;display:flex;gap:8px;padding:0;margin:0 0 12px;font-size:13px;opacity:.8}
.breadcrumbs a{color:#fff}

/* About */
.mission-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:36px}
.mission-card{background:var(--bg);border-radius:var(--radius);padding:24px;text-align:center}
.mission-card h4{font-size:18px;color:var(--primary);margin:0 0 8px}
.history-list{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-top:28px}
.history-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px}
.history-item h4{color:var(--primary);margin:0 0 6px}

/* Courses */
.course-detail-card{display:grid;grid-template-columns:340px 1fr;gap:32px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;margin-bottom:28px}
.course-image{min-height:260px;background:var(--bg)}
.course-image img{width:100%;height:100%;object-fit:cover}
.course-info{padding:28px}
.course-tag{display:inline-block;background:var(--accent-light);color:var(--primary);font-size:12px;font-weight:600;padding:4px 10px;border-radius:4px;margin-bottom:10px}
.course-info h2{font-size:22px;color:var(--primary);margin:0 0 12px}
.course-meta{display:flex;gap:18px;flex-wrap:wrap;font-size:14px;color:var(--muted);margin-bottom:14px}
.course-price{color:var(--accent);font-weight:700}
.course-highlight{background:#f0f7ff;border-left:4px solid var(--primary);padding:12px 16px;border-radius:6px;margin-bottom:14px}

/* Cases detail */
.case-detail-card{display:grid;grid-template-columns:1fr 1.3fr;gap:32px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;margin-bottom:28px}
.case-detail-image{min-height:280px;background:var(--bg)}
.case-detail-image img{width:100%;height:100%;object-fit:cover}
.case-detail-content{padding:28px}
.case-tag{display:inline-block;background:var(--accent-light);color:var(--primary);font-size:12px;font-weight:600;padding:4px 10px;border-radius:4px;margin-bottom:10px}
.case-detail-content h2{font-size:22px;color:var(--primary);margin:0 0 14px}
.case-detail-content p{margin:0 0 10px;color:var(--muted)}
.case-result{background:#f6fbf4;border-left:4px solid #4a9b4a;padding:14px 16px;border-radius:6px;margin-top:14px;color:var(--text)}

/* Articles */
.articles-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.article-card{display:flex;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:.2s}
.article-card:hover{box-shadow:var(--shadow)}
.article-image{width:180px;min-height:160px;flex-shrink:0;background:var(--bg)}
.article-image img{width:100%;height:100%;object-fit:cover}
.article-content{padding:20px;display:flex;flex-direction:column}
.article-category{font-size:12px;color:var(--accent);font-weight:700}
.article-content h3{font-size:17px;margin:8px 0 10px}
.article-content p{font-size:14px;color:var(--muted);margin:0 0 12px;flex:1}
.article-date{font-size:13px;color:var(--muted)}

/* Article detail */
.article-body{max-width:820px;margin:0 auto;background:var(--card);padding:40px;border-radius:var(--radius);border:1px solid var(--border)}
.article-body h3{color:var(--primary);margin:28px 0 12px}
.article-body p{color:var(--text);margin:0 0 16px;line-height:1.8}
.article-meta{display:flex;gap:16px;color:var(--muted);font-size:14px;margin-bottom:24px}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.info-item{display:flex;justify-content:space-between;border-bottom:1px solid var(--border);padding:14px 0;font-size:15px}
.info-label{font-weight:600;color:var(--primary)}
.info-value{color:var(--muted);text-align:right;max-width:60%}

/* FAQ */
.faq-section{background:var(--bg)}
.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;padding:18px 20px}
.faq-item h4{font-size:16px;color:var(--primary);margin:0 0 8px}
.faq-item p{margin:0;color:var(--muted);font-size:14px}

/* Responsive */
@media(max-width:980px){
  .main-nav{display:none}
  .services-grid,.why-grid,.cases-grid{grid-template-columns:repeat(2,1fr)}
  .stats-bar{grid-template-columns:repeat(2,1fr)}
  .split,.course-detail-card,.case-detail-card,.contact-grid{grid-template-columns:1fr}
  .articles-grid{grid-template-columns:1fr}
  .article-card{flex-direction:column}
  .article-image{width:100%;height:180px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .hero h1{font-size:30px}
}
@media(max-width:600px){
  .services-grid,.why-grid,.cases-grid,.stats-bar{grid-template-columns:1fr}
  .hero{min-height:420px}
  .mission-grid,.history-list{grid-template-columns:1fr}
  .section{padding:48px 0}
  .footer-bottom{flex-direction:column;gap:8px;text-align:center}
}