/* ===== COURSE DETAIL PAGE — Shared Styles ===== */
.crs-hero{padding:60px 24px;background:linear-gradient(180deg,#F4F8FD 0%,#EBF2FA 100%);position:relative;overflow:hidden}
.crs-hero-inner{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1.1fr 1fr;gap:50px;align-items:center}
@media(max-width:900px){.crs-hero-inner{grid-template-columns:1fr}}
.crs-bread{display:flex;gap:8px;font-size:13px;color:var(--ink-3);margin-bottom:18px}
.crs-bread a{color:#3B82F6}
.crs-hero h1{font-family:'Poppins',sans-serif;font-size:clamp(34px,4.5vw,52px);font-weight:800;color:#1E3A8A;line-height:1.1;margin-bottom:16px;letter-spacing:-.02em}
.crs-hero .lead{font-size:17px;color:var(--ink-2);line-height:1.65;margin-bottom:24px}
.crs-meta-row{display:flex;gap:20px;flex-wrap:wrap;margin-bottom:28px;font-size:14px;color:var(--ink-2)}
.crs-meta-row span{display:inline-flex;align-items:center;gap:6px}
.crs-meta-row strong{color:var(--navy)}
.crs-cta-row{display:flex;gap:12px;flex-wrap:wrap}
.crs-hero-thumb{aspect-ratio:16/10;border-radius:18px;background-size:cover;background-position:center;box-shadow:0 20px 50px rgba(30,58,138,.2);border:1px solid var(--line)}

.crs-section{padding:60px 24px}
.crs-container{max-width:900px;margin:0 auto;display:block}
@media(max-width:900px){.crs-container{grid-template-columns:1fr}}

.crs-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px;margin-bottom:24px;box-shadow:var(--shadow-sm)}
.crs-card h2{font-size:24px;color:var(--navy);margin-bottom:14px;font-weight:800}
.crs-card h3{font-size:18px;color:var(--navy);margin-bottom:10px;font-weight:700}
.crs-card p{color:var(--ink-2);line-height:1.7;margin-bottom:12px}

.learn-list{display:grid;grid-template-columns:1fr 1fr;gap:14px;list-style:none}
@media(max-width:600px){.learn-list{grid-template-columns:1fr}}
.learn-list li{display:flex;gap:10px;align-items:flex-start;color:var(--ink-2);font-size:14px;line-height:1.5}
.learn-list li::before{content:"✓";color:#10B981;font-weight:700;flex-shrink:0;margin-top:2px}

.module{border:1px solid var(--line);border-radius:12px;margin-bottom:10px;overflow:hidden;background:#fff}
.module summary{padding:16px 20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:var(--navy);list-style:none}
.module summary::-webkit-details-marker{display:none}
.module summary::after{content:"+";font-size:22px;color:#3B82F6;transition:transform .2s}
.module[open] summary::after{transform:rotate(45deg)}
.module-num{display:inline-block;width:28px;height:28px;border-radius:8px;background:#EFF6FF;color:#3B82F6;font-size:12px;font-weight:700;text-align:center;line-height:28px;margin-right:10px}
.module ul{list-style:none;padding:0 20px 16px}
.module ul li{padding:8px 0;color:var(--ink-2);font-size:14px;border-top:1px solid var(--line-soft);display:flex;justify-content:space-between;align-items:center}
.module ul li:first-child{border-top:none}
.module ul li::before{content:"▶";color:#3B82F6;margin-right:8px;font-size:10px}

/* Sidebar */
.crs-side{position:sticky;top:90px}
.crs-price-card{background:linear-gradient(135deg,#1E3A8A,#3B82F6);color:#fff;border-radius:18px;padding:28px;box-shadow:0 20px 50px rgba(30,58,138,.25);position:relative;overflow:hidden;margin-bottom:20px}
.crs-price-card::before{content:"";position:absolute;top:-30%;right:-10%;width:200px;height:200px;border-radius:50%;background:radial-gradient(circle,rgba(96,165,250,.3),transparent 70%)}
.crs-price-card .badge{background:rgba(255,255,255,.15);color:#fff;padding:6px 14px;border-radius:999px;font-size:11px;font-weight:700;letter-spacing:.1em;margin-bottom:14px;display:inline-block;position:relative}
.crs-price-card h3{color:#fff;font-size:22px;margin-bottom:8px;position:relative}
.crs-price-card p{color:rgba(255,255,255,.85);font-size:14px;margin-bottom:18px;position:relative}
.crs-price-card .btn{width:100%;background:#FCD34D;color:var(--navy);font-weight:700;padding:14px;border-radius:10px;text-align:center;display:block;transition:all .25s;position:relative}
.crs-price-card .btn:hover{background:#FBBF24;transform:translateY(-2px)}
.crs-price-card .perks{margin-top:18px;padding-top:18px;border-top:1px solid rgba(255,255,255,.2);position:relative}
.crs-price-card .perks li{padding:6px 0;font-size:13px;color:rgba(255,255,255,.9);list-style:none;display:flex;gap:8px}
.crs-price-card .perks li::before{content:"✓";color:#FCD34D;font-weight:700}

.crs-teacher{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;text-align:center;margin-bottom:20px}
.crs-teacher-avatar{width:80px;height:80px;border-radius:50%;background:linear-gradient(135deg,#1E3A8A,#3B82F6);color:#fff;display:flex;align-items:center;justify-content:center;font-size:28px;font-weight:800;margin:0 auto 14px}
.crs-teacher h4{font-size:17px;color:var(--navy);margin-bottom:4px}
.crs-teacher p{color:var(--ink-3);font-size:13px;margin-bottom:14px}
.crs-teacher .stats{display:flex;justify-content:space-around;font-size:12px;color:var(--ink-3);padding-top:14px;border-top:1px solid var(--line)}
.crs-teacher .stats strong{display:block;color:var(--navy);font-size:18px}

/* Related courses */
.related{padding:60px 24px;background:var(--bg-2)}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;max-width:1100px;margin:30px auto 0}
@media(max-width:900px){.related-grid{grid-template-columns:1fr}}
.related-card{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:all .3s;text-decoration:none;color:inherit;display:block}
.related-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.related-card .thumb{aspect-ratio:16/10;background-size:cover;background-position:center;background-color:#1E3A8A}
.related-card .body{padding:18px}
.related-card h4{color:var(--navy);font-size:15px;margin-bottom:6px}
.related-card p{color:var(--ink-3);font-size:12px}