/* ==========================================================================
   SSAT Practice Test Platform — Core Design System (index.css)
   Ultra-Premium Dark Mode | Glassmorphism | HSL Vibrant Accents
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=Syne:wght@600;700;800&display=swap');

:root {
  --bg-dark: #09090e;
  --bg-card: rgba(18, 18, 28, 0.7);
  --bg-card-hover: rgba(26, 26, 42, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(124, 58, 237, 0.4);
  
  --primary: #7c3aed;
  --primary-light: #9f67ff;
  --primary-dark: #5b21b6;
  --secondary: #06b6d4;
  --accent: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --font-brand: 'Syne', sans-serif;
  --font-body: 'Outfit', sans-serif;
  
  --shadow-lg: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px rgba(124, 58, 237, 0.25);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background: var(--bg-dark);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Background Glowing Blobs */
body::before, body::after {
  content: '';
  position: fixed;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  filter: blur(120px);
  z-index: -1;
  pointer-events: none;
  opacity: 0.15;
}
body::before {
  top: -100px;
  left: -100px;
  background: var(--primary);
}
body::after {
  bottom: -150px;
  right: -100px;
  background: var(--secondary);
}

/* ── Header / Navbar ────────────────────────────────── */
.hdr {
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  background: rgba(9, 9, 14, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.brand {
  font-family: var(--font-brand);
  font-size: 1.35rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  text-decoration: none;
  letter-spacing: -0.5px;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
}

.brand-pill {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.2), rgba(6, 182, 212, 0.2));
  color: var(--primary-light);
  border: 1px solid rgba(124, 58, 237, 0.3);
  padding: 3px 10px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.auth-section {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.95rem;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s, transform 0.2s;
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-link:hover {
  color: #fff;
  transform: translateY(-1px);
}

.btn-auth {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  padding: 8px 18px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.25);
  cursor: pointer;
}
.btn-auth:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(124, 58, 237, 0.4);
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
}

.btn-logout {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-logout:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.05);
}

/* ── Hero Section ───────────────────────────────────── */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 24px 40px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(124, 58, 237, 0.12);
  border: 1px solid rgba(124, 58, 237, 0.3);
  color: var(--primary-light);
  padding: 6px 16px;
  border-radius: 30px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(124, 58, 237, 0.15);
}

.hero h1 {
  font-family: var(--font-brand);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero h1 span {
  background: linear-gradient(135deg, #fff 20%, var(--primary-light) 60%, var(--secondary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  color: var(--text-muted);
  font-size: 1.15rem;
  max-width: 650px;
  margin: 0 auto 40px;
  font-weight: 400;
}

/* ── Primary Level Tabs ─────────────────────────────── */
.level-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.level-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 14px 28px;
  border-radius: 14px;
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  align-items: center;
  gap: 10px;
  position: relative;
  overflow: hidden;
}

.level-btn::before {
  content: '';
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.15), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.level-btn:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}
.level-btn:hover::before {
  opacity: 1;
}

.level-btn.active {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.25), rgba(91, 33, 182, 0.15));
  border-color: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.level-badge {
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 500;
}
.level-btn.active .level-badge {
  background: var(--primary);
  color: #fff;
}

/* ── Secondary Sub-Tabs (Diagnostic / Topic) ────────── */
.sub-tabs-wrapper {
  background: rgba(18, 18, 28, 0.5);
  border: 1px solid var(--border-color);
  padding: 8px;
  border-radius: 16px;
  display: inline-flex;
  gap: 8px;
  margin-bottom: 40px;
  backdrop-filter: blur(10px);
}

.sub-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 10px 24px;
  border-radius: 10px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sub-btn:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
}

.sub-btn.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 15px rgba(124, 58, 237, 0.35);
}

/* ── Exam Cards Grid ────────────────────────────────── */
.tab-content {
  display: none;
  animation: fadeIn 0.4s ease forwards;
}
.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
  padding: 10px 0 60px;
}

.exam-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  backdrop-filter: blur(12px);
  overflow: hidden;
  text-align: left;
}

.exam-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: 0;
  transition: opacity 0.3s;
}

.exam-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(124, 58, 237, 0.4);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}
.exam-card:hover::before {
  opacity: 1;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 18px;
}

.card-icon {
  width: 52px;
  height: 52px;
  background: rgba(124, 58, 237, 0.15);
  border: 1px solid rgba(124, 58, 237, 0.25);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: transform 0.3s;
}
.exam-card:hover .card-icon {
  transform: scale(1.08) rotate(5deg);
}

.card-tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.tag-avail {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}
.tag-lock {
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.3);
}
.tag-prem {
  background: rgba(124, 58, 237, 0.2);
  color: var(--primary-light);
  border: 1px solid rgba(124, 58, 237, 0.4);
}

.card-num {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.card-title {
  font-family: var(--font-brand);
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
  line-height: 1.3;
}

.card-sub {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 24px;
  flex-grow: 1;
  display: flex;
  align-items: center;
  gap: 12px;
}
.card-sub-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.card-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.3s;
  cursor: pointer;
}

.exam-card:hover .card-btn {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-color: transparent;
  box-shadow: 0 4px 15px rgba(124, 58, 237, 0.35);
}

/* ── Distinct Card Themes (Unique visual identity per card) ──── */
/* 1. Royal Gold & Amber Theme */
.exam-card.theme-gold { background: linear-gradient(145deg, rgba(255, 215, 0, 0.05), rgba(20, 15, 35, 0.85)); border-color: rgba(255, 215, 0, 0.25); }
.exam-card.theme-gold::before { background: linear-gradient(90deg, #ffd700, #ff8c00); opacity: 1; height: 3px; }
.exam-card.theme-gold .card-icon { background: rgba(255, 215, 0, 0.15); border-color: rgba(255, 215, 0, 0.35); color: #ffd700; box-shadow: 0 0 15px rgba(255,215,0,0.2); }
.exam-card.theme-gold:hover { border-color: #ffd700; box-shadow: 0 12px 30px rgba(255, 215, 0, 0.25), 0 0 20px rgba(255, 140, 0, 0.2); transform: translateY(-6px); }
.exam-card.theme-gold:hover .card-btn { background: linear-gradient(135deg, #ffd700, #ff8c00); color: #000; font-weight: 700; box-shadow: 0 4px 15px rgba(255, 215, 0, 0.4); }

/* 2. Cyber Cyan & Blue Theme */
.exam-card.theme-cyan { background: linear-gradient(145deg, rgba(6, 182, 212, 0.05), rgba(15, 23, 42, 0.85)); border-color: rgba(6, 182, 212, 0.25); }
.exam-card.theme-cyan::before { background: linear-gradient(90deg, #06b6d4, #3b82f6); opacity: 1; height: 3px; }
.exam-card.theme-cyan .card-icon { background: rgba(6, 182, 212, 0.15); border-color: rgba(6, 182, 212, 0.35); color: #06b6d4; }
.exam-card.theme-cyan:hover { border-color: #06b6d4; box-shadow: 0 12px 30px rgba(6, 182, 212, 0.25), 0 0 20px rgba(59, 130, 246, 0.2); transform: translateY(-6px); }
.exam-card.theme-cyan:hover .card-btn { background: linear-gradient(135deg, #06b6d4, #3b82f6); color: #fff; box-shadow: 0 4px 15px rgba(6, 182, 212, 0.4); }

/* 3. Sunset Rose & Magenta Theme */
.exam-card.theme-magenta { background: linear-gradient(145deg, rgba(236, 72, 153, 0.05), rgba(15, 23, 42, 0.85)); border-color: rgba(236, 72, 153, 0.25); }
.exam-card.theme-magenta::before { background: linear-gradient(90deg, #ec4899, #f43f5e); opacity: 1; height: 3px; }
.exam-card.theme-magenta .card-icon { background: rgba(236, 72, 153, 0.15); border-color: rgba(236, 72, 153, 0.35); color: #ec4899; }
.exam-card.theme-magenta:hover { border-color: #ec4899; box-shadow: 0 12px 30px rgba(236, 72, 153, 0.25), 0 0 20px rgba(244, 63, 94, 0.2); transform: translateY(-6px); }
.exam-card.theme-magenta:hover .card-btn { background: linear-gradient(135deg, #ec4899, #f43f5e); color: #fff; box-shadow: 0 4px 15px rgba(236, 72, 153, 0.4); }

/* 4. Emerald Mint & Teal Theme */
.exam-card.theme-emerald { background: linear-gradient(145deg, rgba(16, 185, 129, 0.05), rgba(15, 23, 42, 0.85)); border-color: rgba(16, 185, 129, 0.25); }
.exam-card.theme-emerald::before { background: linear-gradient(90deg, #10b981, #14b8a6); opacity: 1; height: 3px; }
.exam-card.theme-emerald .card-icon { background: rgba(16, 185, 129, 0.15); border-color: rgba(16, 185, 129, 0.35); color: #10b981; }
.exam-card.theme-emerald:hover { border-color: #10b981; box-shadow: 0 12px 30px rgba(16, 185, 129, 0.25), 0 0 20px rgba(20, 184, 166, 0.2); transform: translateY(-6px); }
.exam-card.theme-emerald:hover .card-btn { background: linear-gradient(135deg, #10b981, #059669); color: #fff; box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4); }

/* 5. Solar Orange & Amber Theme */
.exam-card.theme-amber { background: linear-gradient(145deg, rgba(249, 115, 22, 0.05), rgba(15, 23, 42, 0.85)); border-color: rgba(249, 115, 22, 0.25); }
.exam-card.theme-amber::before { background: linear-gradient(90deg, #f97316, #eab308); opacity: 1; height: 3px; }
.exam-card.theme-amber .card-icon { background: rgba(249, 115, 22, 0.15); border-color: rgba(249, 115, 22, 0.35); color: #f97316; }
.exam-card.theme-amber:hover { border-color: #f97316; box-shadow: 0 12px 30px rgba(249, 115, 22, 0.25), 0 0 20px rgba(234, 179, 8, 0.2); transform: translateY(-6px); }
.exam-card.theme-amber:hover .card-btn { background: linear-gradient(135deg, #f97316, #d97706); color: #fff; box-shadow: 0 4px 15px rgba(249, 115, 22, 0.4); }

/* 6. Electric Violet & Indigo Theme */
.exam-card.theme-violet { background: linear-gradient(145deg, rgba(139, 92, 246, 0.05), rgba(15, 23, 42, 0.85)); border-color: rgba(139, 92, 246, 0.25); }
.exam-card.theme-violet::before { background: linear-gradient(90deg, #8b5cf6, #6366f1); opacity: 1; height: 3px; }
.exam-card.theme-violet .card-icon { background: rgba(139, 92, 246, 0.15); border-color: rgba(139, 92, 246, 0.35); color: #8b5cf6; }
.exam-card.theme-violet:hover { border-color: #8b5cf6; box-shadow: 0 12px 30px rgba(139, 92, 246, 0.25), 0 0 20px rgba(99, 102, 241, 0.2); transform: translateY(-6px); }
.exam-card.theme-violet:hover .card-btn { background: linear-gradient(135deg, #8b5cf6, #6366f1); color: #fff; box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4); }

/* 7. Ruby Red & Pink Theme */
.exam-card.theme-rose { background: linear-gradient(145deg, rgba(244, 63, 94, 0.05), rgba(15, 23, 42, 0.85)); border-color: rgba(244, 63, 94, 0.25); }
.exam-card.theme-rose::before { background: linear-gradient(90deg, #f43f5e, #fb7185); opacity: 1; height: 3px; }
.exam-card.theme-rose .card-icon { background: rgba(244, 63, 94, 0.15); border-color: rgba(244, 63, 94, 0.35); color: #f43f5e; }
.exam-card.theme-rose:hover { border-color: #f43f5e; box-shadow: 0 12px 30px rgba(244, 63, 94, 0.25), 0 0 20px rgba(251, 113, 133, 0.2); transform: translateY(-6px); }
.exam-card.theme-rose:hover .card-btn { background: linear-gradient(135deg, #f43f5e, #e11d48); color: #fff; box-shadow: 0 4px 15px rgba(244, 63, 94, 0.4); }

/* 8. Ocean Teal & Cyan Theme */
.exam-card.theme-teal { background: linear-gradient(145deg, rgba(20, 184, 166, 0.05), rgba(15, 23, 42, 0.85)); border-color: rgba(20, 184, 166, 0.25); }
.exam-card.theme-teal::before { background: linear-gradient(90deg, #14b8a6, #06b6d4); opacity: 1; height: 3px; }
.exam-card.theme-teal .card-icon { background: rgba(20, 184, 166, 0.15); border-color: rgba(20, 184, 166, 0.35); color: #14b8a6; }
.exam-card.theme-teal:hover { border-color: #14b8a6; box-shadow: 0 12px 30px rgba(20, 184, 166, 0.25), 0 0 20px rgba(6, 182, 212, 0.2); transform: translateY(-6px); }
.exam-card.theme-teal:hover .card-btn { background: linear-gradient(135deg, #14b8a6, #0d9488); color: #fff; box-shadow: 0 4px 15px rgba(20, 184, 166, 0.4); }


/* ── Modal / Alert Overlay ──────────────────────────── */
.modal-bg {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.modal-bg.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: #13131f;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 24px;
  padding: 36px;
  max-width: 440px;
  width: 90%;
  text-align: center;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7), var(--shadow-glow);
  transform: scale(0.95);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.modal-bg.open .modal-box {
  transform: scale(1);
}

.modal-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  display: inline-block;
}

.modal-title {
  font-family: var(--font-brand);
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}

.modal-msg {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 28px;
  line-height: 1.6;
}

.modal-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.btn-modal-sec {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: #fff;
  padding: 10px 20px;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  flex: 1;
}
.btn-modal-sec:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn-modal-pri {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border: none;
  color: #fff;
  padding: 10px 20px;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  flex: 1;
  box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
}
.btn-modal-pri:hover {
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  box-shadow: 0 6px 20px rgba(124, 58, 237, 0.45);
}

/* ── Footer ─────────────────────────────────────────── */
.ftr {
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--border-color);
  color: var(--text-dim);
  font-size: 0.9rem;
  background: rgba(9, 9, 14, 0.5);
}

/* ── Responsive Breakpoints ─────────────────────────── */
@media (max-width: 768px) {
  .hdr {
    padding: 0 20px;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .level-btn {
    padding: 10px 18px;
    font-size: 0.95rem;
  }
  .cards-grid {
    grid-template-columns: 1fr;
  }
}