/* ============================================================
   AIBE Mock Test Series — Modern Design System
   ============================================================ */
:root{
  --primary:#4f46e5;
  --primary-dark:#3730a3;
  --accent:#d4a017;
  --ink:#0f172a;
  --muted:#64748b;
  --bg:#f7f8fc;
  --surface:#ffffff;
  --border:#e5e7eb;
  --success:#16a34a;
  --danger:#dc2626;
  --radius:14px;
  --shadow:0 10px 30px rgba(15,23,42,.06);
  --shadow-lg:0 20px 45px rgba(15,23,42,.12);
}
*{box-sizing:border-box}
body{
  font-family:'Poppins',Inter,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  margin:0;background:var(--bg);color:var(--ink);line-height:1.65;
}
.wrap{max-width:1080px;margin:0 auto;padding:20px}

/* Header */
.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50;backdrop-filter:blur(6px)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between}
.brand{font-weight:700;color:var(--ink);text-decoration:none;font-size:20px}
.nav a{margin-left:14px;color:#374151;text-decoration:none}
.btn{
  display:inline-block;background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;padding:11px 22px;border-radius:999px;text-decoration:none;font-weight:600;
  box-shadow:0 8px 20px rgba(79,70,229,.28);border:none;cursor:pointer;transition:transform .15s ease, box-shadow .15s ease;
}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(79,70,229,.35)}
.btn-outline{background:#fff;color:var(--primary);border:2px solid var(--primary);box-shadow:none}

.site-footer{background:var(--surface);border-top:1px solid var(--border);margin-top:20px}

/* Hero */
.hero{
  background:linear-gradient(135deg,#1e1b4b 0%,#4f46e5 55%,#6d28d9 100%);
  color:#fff;border-radius:24px;padding:48px 32px;margin:24px 0;
  box-shadow:var(--shadow-lg);position:relative;overflow:hidden;
}
.hero::after{
  content:"";position:absolute;inset:0;
  background:radial-gradient(600px circle at 85% 0%,rgba(255,255,255,.12),transparent 60%);
}
.hero h1{font-size:34px;line-height:1.25;margin:0 0 14px;position:relative}
.hero p{font-size:16px;opacity:.92;max-width:620px;position:relative}
.hero .pill{
  display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,.14);
  border:1px solid rgba(255,255,255,.25);color:#fff;padding:6px 14px;border-radius:999px;
  font-size:13px;font-weight:600;margin:4px 6px 4px 0;position:relative;
}

/* Cards */
.card{background:var(--surface);padding:24px;border-radius:var(--radius);box-shadow:var(--shadow);margin:20px 0;border:1px solid var(--border)}
.grid{display:grid;gap:18px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
@media(max-width:768px){.grid-3,.grid-2{grid-template-columns:1fr}}

.feature{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px;transition:transform .15s ease, box-shadow .15s ease}
.feature:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.feature .icon{font-size:26px;margin-bottom:10px}
.feature h3{margin:0 0 8px;font-size:17px}
.feature p{margin:0;color:var(--muted);font-size:14px}

/* Pricing */
.premium-box{
  background:linear-gradient(135deg,var(--primary),#7c3aed);
  color:#fff;padding:30px;border-radius:20px;text-align:center;box-shadow:var(--shadow-lg);
}
.premium-box .price{font-size:38px;font-weight:800;margin:14px 0}
.premium-box .btn{background:#fff;color:var(--primary-dark);box-shadow:none}

/* Subject chips */
.subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px;margin-top:16px}
.subject-chip{
  background:#fff;border:1px solid var(--border);border-left:4px solid var(--accent);
  border-radius:10px;padding:12px 14px;font-size:14px;font-weight:500;color:var(--ink);
}

/* Tables */
.table-wrapper{overflow-x:auto;border-radius:12px;border:1px solid var(--border)}
table{width:100%;border-collapse:collapse;min-width:480px}
table th{background:var(--ink);color:#fff;padding:12px;text-align:left;font-weight:600;font-size:14px}
table td{padding:12px;border-bottom:1px solid var(--border);font-size:14px}
table tr:nth-child(even) td{background:#f9fafb}

/* Forms */
input[type=text],input[type=email],input[type=password],select,textarea{
  width:100%;padding:11px 12px;border:1px solid var(--border);border-radius:10px;margin:6px 0;font-family:inherit;
}
input:focus,select:focus,textarea:focus{outline:2px solid var(--primary);outline-offset:1px}

.question{padding:16px;border-radius:12px;border:1px solid var(--border);margin:14px 0;background:#fff}
.option{display:block;margin:8px 0;padding:10px 12px;border-radius:10px;border:1px solid var(--border);cursor:pointer;transition:.15s}
.option:hover{border-color:var(--primary);background:#f5f5ff}
.timer{font-weight:700;color:var(--primary)}
.progress{height:10px;background:#e6eefc;border-radius:999px;overflow:hidden}
.progress > span{display:block;height:10px;background:linear-gradient(90deg,var(--primary),var(--accent));width:0}

.leaderboard li{padding:10px 0;border-bottom:1px dashed var(--border)}
.small-muted{color:var(--muted);font-size:13px}

.faq h3{cursor:pointer;margin:0;padding:14px 0;border-bottom:1px solid var(--border);font-size:15px}

hr{border:none;border-top:1px solid var(--border);margin:28px 0}

@media(max-width:640px){
  .wrap{padding:14px}
  .site-header .wrap{flex-direction:column;align-items:flex-start;gap:8px}
  .hero{padding:30px 20px;border-radius:16px}
  .hero h1{font-size:26px}
}