/* www.beijingsaichepk10.com.cn — 北京赛车PK10 白蓝学院风
   参考mj168vip.com 骨架风格，蓝/白/金配色
*/
/* Fonts loaded in HTML head inline */
/* FA icons loaded in HTML head */

:root{
  --deep:#0f172a;--blue:#1565c0;--blue2:#0d47a1;--gold:#ffc107;--gold2:#f59e0b;
  --bg:#f8fafc;--card:#fff;--text:#1e293b;--muted:#64748b;--border:#e2e8f0;
  --font:'Inter','Noto Sans SC',sans-serif;--font2:'Bebas Neue',sans-serif;
  --radius:16px;--shadow:0 4px 24px rgba(15,23,42,0.08);--shadow-lg:0 12px 48px rgba(15,23,42,0.12);--trans:0.3s ease
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.7;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* ─── Nav ─── */
nav{position:fixed;top:0;left:0;right:0;z-index:999;background:rgba(255,255,255,0.95);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);transition:var(--trans)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;max-width:1200px;margin:0 auto;padding:14px 20px}
.logo{font-family:var(--font2);font-size:1.6rem;color:var(--blue);letter-spacing:2px}
.logo span{color:var(--deep)}
.nav-links{display:flex;gap:4px;list-style:none}
.nav-links a{padding:8px 16px;font-size:0.85rem;font-weight:500;color:var(--muted);border-radius:8px;transition:var(--trans)}
.nav-links a:hover,.nav-links a.active{color:var(--blue);background:#eef2ff}
.nav-btn{display:inline-flex;align-items:center;gap:6px;padding:10px 22px;background:var(--blue);color:#fff!important;font-size:0.8rem;font-weight:600;border-radius:50px;transition:var(--trans)}
.nav-btn:hover{background:var(--blue2);transform:translateY(-1px)}
.menu-toggle{display:none;font-size:1.5rem;background:none;border:none;cursor:pointer;color:var(--deep)}
@media(max-width:768px){
  .nav-links{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;padding:12px;border-bottom:1px solid var(--border)}
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 16px}
  .nav-btn{display:none}
  .menu-toggle{display:block}
}

/* ─── Hero ─── */
.hero{background:linear-gradient(135deg,#0f172a 0%,#0d47a1 45%,#1565c0 100%);padding:140px 0 80px;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;inset:0;background:url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='30' cy='30' r='1' fill='%23ffffff10'/%3E%3C/svg%3E") repeat;opacity:0.3}
.hero-wave{position:absolute;bottom:-2px;left:0;right:0;height:60px;background:var(--bg);mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 60'%3E%3Cpath d='M0,30 C360,60 720,0 1440,30 L1440,60 L0,60 Z' fill='%23fff'/%3E%3C/svg%3E")no-repeat bottom;mask-size:cover;-webkit-mask-size:cover}
.hero .container{position:relative;z-index:2;display:flex;align-items:center;gap:40px}
.hero-text{flex:1}
.hero-sub{font-size:0.85rem;color:#93c5fd;letter-spacing:3px;text-transform:uppercase;margin-bottom:12px;font-weight:500}
.hero h1{font-size:clamp(2rem,4vw,3.4rem);font-weight:900;color:#fff;line-height:1.15;margin-bottom:16px}
.hero h1 span{color:var(--gold)}
.hero p{font-size:1rem;color:#bfdbfe;max-width:600px;margin-bottom:28px;line-height:1.8}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-split{display:flex;align-items:center;gap:40px}
.hero-text{flex:1}
.hero-visual{flex:1;display:flex;justify-content:center;align-items:center}
.hero-img{max-width:100%;height:auto;border-radius:16px;box-shadow:0 20px 60px rgba(0,0,0,0.3)}
@media(max-width:768px){.hero-split{flex-direction:column}.hero-visual{order:-1}}

.btn-primary{display:inline-flex;align-items:center;gap:8px;padding:14px 32px;background:var(--gold);color:var(--deep)!important;font-weight:700;font-size:0.95rem;border:none;border-radius:50px;cursor:pointer;transition:var(--trans);text-decoration:none}
.btn-primary:hover{background:#e6ab09;transform:translateY(-2px);box-shadow:0 8px 24px rgba(255,193,7,0.3)}
.btn-outline{display:inline-flex;align-items:center;gap:8px;padding:14px 32px;background:rgba(255,255,255,0.1);color:#fff!important;font-weight:600;font-size:0.95rem;border:1.5px solid rgba(255,255,255,0.25);border-radius:50px;cursor:pointer;transition:var(--trans);text-decoration:none}
.btn-outline:hover{background:rgba(255,255,255,0.2);transform:translateY(-2px)}

/* ─── Section ─── */
.section{padding:70px 0}
.section-alt{background:#fff}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:clamp(1.5rem,3vw,2.2rem);font-weight:800;color:var(--deep);margin-bottom:8px}
.section-title h2 span{color:var(--blue)}
.section-title p{color:var(--muted);font-size:0.95rem;max-width:600px;margin:0 auto}

/* ─── Grids ─── */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
@media(max-width:768px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

.card{background:var(--card);border-radius:var(--radius);padding:28px;border:1px solid var(--border);transition:var(--trans)}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--blue)}
.card-icon{font-size:2rem;color:var(--blue);margin-bottom:12px;display:block}
.card h3{font-size:1.05rem;font-weight:700;margin-bottom:8px;color:var(--deep)}
.card p{font-size:0.88rem;color:var(--muted);line-height:1.6}
.card-featured{border-color:var(--gold);background:linear-gradient(135deg,#fffbeb,#fff)}
.card-featured .card-icon{color:var(--gold2)}

/* ─── Stats ─── */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:40px;background:var(--blue);border-radius:var(--radius);color:#fff;text-align:center}
.stat-num{font-family:var(--font2);font-size:2.2rem;font-weight:900;letter-spacing:2px}
.stat-label{font-size:0.85rem;opacity:0.8;margin-top:4px}
@media(max-width:768px){.stats{grid-template-columns:repeat(2,1fr)}}

/* ─── Split ─── */
.split{display:flex;align-items:center;gap:40px}
.split-visual{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px;background:linear-gradient(135deg,#eef2ff,#fff);border-radius:var(--radius);border:1px solid var(--border);min-height:240px}
.split-visual .big-icon{font-size:4rem}
.split-text{flex:1.2}
.split-text h3{font-size:1.3rem;font-weight:700;margin-bottom:12px;color:var(--deep)}
.split-text p{font-size:0.92rem;color:var(--muted);line-height:1.7}
@media(max-width:768px){.split{flex-direction:column}}

/* ─── Info panels ─── */
.info-row{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.info-item{text-align:center;padding:24px;background:var(--card);border-radius:var(--radius);border:1px solid var(--border)}
.info-item h4{font-size:1rem;font-weight:700;color:var(--deep);margin-bottom:6px}
.info-item p{font-size:0.85rem;color:var(--muted)}
@media(max-width:768px){.info-row{grid-template-columns:1fr}}

/* ─── Timeline ─── */
.timeline{max-width:700px;margin:0 auto;position:relative;padding-left:30px}
.timeline::before{content:'';position:absolute;left:8px;top:0;bottom:0;width:2px;background:linear-gradient(to bottom,var(--blue),var(--gold))}
.tl-item{position:relative;padding:16px 0 16px 20px;border-left:2px solid transparent}
.tl-item::before{content:'';position:absolute;left:-24px;top:24px;width:12px;height:12px;border-radius:50%;background:var(--blue);border:3px solid #fff;box-shadow:0 0 0 2px var(--blue)}
.tl-item h3{font-size:1rem;font-weight:700;color:var(--deep)}
.tl-item p{font-size:0.85rem;color:var(--muted);margin-top:4px}

/* ─── Testimonials ─── */
.testi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.testi-card{padding:24px;background:var(--card);border-radius:var(--radius);border:1px solid var(--border)}
.testi-stars{color:var(--gold);font-size:0.9rem;margin-bottom:8px}
.testi-card p{font-size:0.85rem;color:var(--muted);font-style:italic;margin-bottom:12px}
.testi-author{font-size:0.82rem;font-weight:600;color:var(--deep)}
.testi-author small{font-weight:400;color:var(--muted);margin-left:6px}
@media(max-width:768px){.testi-grid{grid-template-columns:1fr}}

/* ─── CTA Box ─── */
.cta-box{text-align:center;padding:50px 30px;background:linear-gradient(135deg,var(--blue),#1e40af);border-radius:var(--radius);color:#fff}
.cta-box h2{font-size:1.8rem;font-weight:800;margin-bottom:8px}
.cta-box p{font-size:0.95rem;opacity:0.9;margin-bottom:24px}
.cta-box .btn-primary{background:#fff;color:var(--blue)!important;font-size:1rem}
.cta-box .btn-primary:hover{background:var(--gold);color:var(--deep)!important}

/* ─── Gallery strip ─── */
.gallery-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.gallery-cell{padding:40px 20px;text-align:center;background:linear-gradient(135deg,#eef2ff,#fff);border-radius:var(--radius);border:1px solid var(--border);font-size:1rem;font-weight:600;color:var(--muted);transition:var(--trans)}
.gallery-cell:hover{transform:translateY(-3px);border-color:var(--blue);box-shadow:0 8px 24px rgba(21,101,192,0.1)}
@media(max-width:768px){.gallery-strip{grid-template-columns:repeat(2,1fr)}}

/* ─── Award badges ─── */
.award-list{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.award-badge{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;background:var(--card);border:1px solid var(--border);border-radius:50px;font-size:0.8rem;color:var(--muted);font-weight:500}

/* ─── FAQ ─── */
.faq-list{max-width:750px;margin:0 auto}
details{background:var(--card);border:1px solid var(--border);border-radius:12px;margin-bottom:10px;overflow:hidden;transition:var(--trans)}
details[open]{border-color:var(--blue);box-shadow:0 4px 16px rgba(21,101,192,0.1)}
summary{padding:16px 20px;font-weight:600;font-size:0.95rem;color:var(--deep);cursor:pointer;display:flex;align-items:center;justify-content:space-between;list-style:none}
summary::-webkit-details-marker{display:none}
summary::after{content:'+';font-size:1.2rem;color:var(--blue);transition:var(--trans);font-weight:700}
details[open] summary::after{content:'−'}
details[open] summary{border-bottom:1px solid var(--border)}
details[open] div{padding:16px 20px;font-size:0.88rem;color:var(--muted);line-height:1.7}

/* ─── Footer ─── */
.footer{background:var(--deep);color:#94a3b8;padding:60px 0 30px}
.footer-inner{max-width:1200px;margin:0 auto;padding:0 20px;display:grid;grid-template-columns:2fr 1fr 1fr 1.5fr;gap:30px}
.footer-brand .logo{font-family:var(--font2);font-size:1.8rem;color:#fff}
.footer-brand p{font-size:0.8rem;margin-top:6px}
.footer-links h4{font-size:0.85rem;color:#fff;font-weight:700;margin-bottom:12px;text-transform:uppercase}
.footer-links a{display:block;font-size:0.82rem;color:#94a3b8;padding:4px 0;transition:var(--trans)}
.footer-links a:hover{color:var(--gold)}
.footer-contact h4{font-size:0.85rem;color:#fff;font-weight:700;margin-bottom:12px}
.footer-contact a{display:block;font-size:0.85rem;padding:6px 0;color:#94a3b8;transition:var(--trans)}
.footer-contact a:hover{color:var(--gold)}
.tg-link{color:var(--gold)!important;font-weight:600}
.footer-bottom{text-align:center;padding-top:30px;margin-top:30px;border-top:1px solid #1e293b;font-size:0.8rem;color:#64748b}
@media(max-width:768px){.footer-inner{grid-template-columns:1fr 1fr}}

/* ─── Back to top ─── */
.back-top{position:fixed;bottom:24px;right:24px;width:42px;height:42px;border-radius:50%;border:1px solid var(--border);background:var(--card);color:var(--blue);display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;transition:all 0.3s;z-index:99;font-size:1rem;box-shadow:var(--shadow)}
.back-top.show{opacity:1}
.back-top:hover{background:var(--blue);color:#fff;transform:translateY(-3px)}