:root{
    --bg:#f8fafc;
    --card:#ffffff;
    --text:#0f172a;
    --muted:#64748b;
    --orange:#f97316;
    --orange-dark:#ea580c;
    --orange-soft:#fff7ed;
    --blue:#2563eb;
    --blue-dark:#1d4ed8;
    --blue-soft:#eff6ff;
    --border:#e2e8f0;
    --shadow:0 20px 40px rgba(15,23,42,.08);
}
*{box-sizing:border-box}
body{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:var(--text);background:linear-gradient(180deg,#fff7ed 0%,#f8fafc 22%,#f8fafc 100%)}
a{text-decoration:none}
.site-header{background:rgba(255,255,255,.85);backdrop-filter:blur(14px);border-bottom:1px solid rgba(226,232,240,.9)}
.navbar-brand .brand-text{font-weight:800;letter-spacing:.2px;color:var(--text)}
.btn-primary{background:linear-gradient(135deg,var(--orange),#fb923c 55%,var(--blue));border:none;box-shadow:0 12px 24px rgba(249,115,22,.25)}
.btn-primary:hover{background:linear-gradient(135deg,var(--orange-dark),var(--orange),var(--blue-dark))}
.btn-outline-primary{color:var(--blue);border-color:rgba(37,99,235,.35)}
.btn-outline-primary:hover{background:var(--blue);border-color:var(--blue);color:#fff}
.hero-card,.glass-card,.auth-card,.course-card,.page-banner,.admin-stat-card{background:rgba(255,255,255,.9);border:1px solid rgba(255,255,255,.8);box-shadow:var(--shadow);border-radius:28px}
.hero-card{padding:2.25rem;background:
    radial-gradient(circle at top right, rgba(37,99,235,.14), transparent 30%),
    radial-gradient(circle at left center, rgba(249,115,22,.16), transparent 35%),
    linear-gradient(135deg,#ffffff,#fff7ed 55%,#eff6ff)}
.hero-art{max-height:430px}
.section-heading{display:flex;justify-content:space-between;align-items:end;gap:1rem}
.section-heading h2,.page-banner h2{font-weight:800}
.glass-card,.auth-card,.page-banner{padding:1.5rem}
.course-card{overflow:hidden;border:1px solid rgba(37,99,235,.08)}
.course-thumb{width:100%;height:180px;object-fit:cover;background:linear-gradient(135deg,#fff7ed,#eff6ff)}
.chip{display:inline-flex;align-items:center;padding:.4rem .75rem;border-radius:999px;font-size:.8rem;font-weight:700}
.chip-orange{background:var(--orange-soft);color:var(--orange-dark)}
.chip-blue{background:var(--blue-soft);color:var(--blue-dark)}
.chip-light{background:#f8fafc;color:#475569}
.stat-card,.admin-stat-card{padding:1.15rem 1.2rem}
.stat-card strong,.admin-stat-value{display:block;font-size:1.8rem;font-weight:800;line-height:1}
.stat-card span,.admin-stat-label{display:block;color:var(--muted);margin-top:.35rem}
.progress{height:12px;background:#e2e8f0}
.progress-bar{background:linear-gradient(90deg,var(--orange),var(--blue))}
.auth-card{padding:2rem}
.mobile-bottom-nav{position:fixed;left:0;right:0;bottom:0;background:#fff;border-top:1px solid var(--border);display:flex;justify-content:space-around;padding:.75rem 1rem;z-index:1040}
.mobile-bottom-nav a{font-size:.92rem;color:#334155;font-weight:600}
.page-banner{display:flex;justify-content:space-between;align-items:center;background:
 linear-gradient(135deg,rgba(249,115,22,.12),rgba(37,99,235,.08))}
.mini-row{display:flex;justify-content:space-between;align-items:center;gap:1rem;padding:.75rem 0;border-bottom:1px dashed #e2e8f0}
.mini-row:last-child{border-bottom:none}
.admin-body{background:#f8fafc}
.admin-shell{display:flex;min-height:100vh}
.admin-sidebar{width:292px;padding:1.25rem;background:linear-gradient(180deg,#0f172a,#1e293b);color:#fff;position:sticky;top:0;height:100vh}
.admin-brand{display:flex;align-items:center;gap:1rem;padding:1rem;border-radius:24px;background:linear-gradient(135deg,rgba(249,115,22,.22),rgba(37,99,235,.28))}
.admin-brand-title{font-weight:800;font-size:1.15rem}
.admin-brand-sub{opacity:.8;font-size:.86rem}
.admin-nav{display:flex;flex-direction:column;gap:.35rem;margin-top:1rem}
.admin-nav a{color:#e2e8f0;padding:.9rem 1rem;border-radius:18px;transition:.2s;background:transparent}
.admin-nav a:hover{background:rgba(255,255,255,.08);color:#fff}
.admin-main{flex:1;padding:1.5rem 1.25rem 2rem}
.admin-topbar{display:flex;justify-content:space-between;align-items:start;gap:1rem;margin-bottom:1.25rem}
.admin-page-title{font-size:1.8rem;font-weight:800}
.admin-user-chip{background:#fff;border:1px solid var(--border);border-radius:999px;padding:.75rem 1rem;font-weight:700}
.admin-table th{font-size:.82rem;text-transform:uppercase;letter-spacing:.03em;color:#475569}
.admin-table td{font-size:.95rem}
.form-control,.form-select{border:1px solid #cbd5e1;min-height:48px}
.form-control:focus,.form-select:focus{border-color:#fdba74;box-shadow:0 0 0 .25rem rgba(249,115,22,.12)}
.table>:not(caption)>*>*{padding:.95rem .85rem}
@media (max-width: 991px){
    .admin-shell{flex-direction:column}
    .admin-sidebar{width:100%;height:auto;position:relative}
    .admin-main{padding-bottom:6rem}
    .section-heading{flex-direction:column;align-items:start}
}
@media (min-width: 992px){
    .mobile-bottom-nav{display:none}
}