/* ─────────────────────────────────────────
   MCQ Practice Hub — mcq.css
   ───────────────────────────────────────── */

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

:root {
  /* Dark Theme (JavaScript) */
  --bg:         #0a0a0f;
  --bg2:        #0f0f1a;
  --bg3:        #13131f;
  --border:     rgba(255,255,255,0.08);
  --yellow:     #f7df1e;
  --yellow-dim: rgba(247,223,30,0.12);
  --green:      #22c55e;
  --green-dim:  rgba(34,197,94,0.12);
  --purple:     #a78bfa;
  --purple-dim: rgba(167,139,250,0.12);
  --text:       #e2e8f0;
  --text-2:     #94a3b8;
  --text-3:     #64748b;
}

/* Light Theme */
:root.light-theme {
  --bg:         #ffffff;
  --bg2:        #f8fafc;
  --bg3:        #f0f4f8;
  --border:     rgba(0,0,0,0.08);
  --yellow:     #f39c12;
  --yellow-dim: rgba(243,156,18,0.15);
  --green:      #27ae60;
  --green-dim:  rgba(39,174,96,0.15);
  --purple:     #8e44ad;
  --purple-dim: rgba(142,68,173,0.15);
  --text:       #1a1a1a;
  --text-2:     #4a5568;
  --text-3:     #718096;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background 0.4s, color 0.4s;
}

body::before {
  content: '';
  position: fixed; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse 55% 45% at 15% 15%, rgba(247,223,30,0.06) 0%, transparent 70%),
    radial-gradient(ellipse 45% 55% at 85% 85%, rgba(167,139,250,0.06) 0%, transparent 70%);
  pointer-events: none;
  animation: bg-pulse 8s ease-in-out infinite alternate;
}

:root.light-theme body::before {
  background:
    radial-gradient(ellipse 55% 45% at 15% 15%, rgba(243,156,18,0.08) 0%, transparent 70%),
    radial-gradient(ellipse 45% 55% at 85% 85%, rgba(142,68,173,0.08) 0%, transparent 70%);
}

@keyframes bg-pulse {
  from { opacity: 0.8; }
  to   { opacity: 1.2; }
}

a { text-decoration: none; color: inherit; }

/* ── PARTICLES ── */
.particles {
  position: fixed; inset: 0;
  pointer-events: none; z-index: 0; overflow: hidden;
}

.particle {
  position: absolute;
  font-family: 'Fira Code', monospace;
  font-size: 1.2rem;
  font-weight: 700;
  opacity: 0;
  animation: float-up linear infinite;
  will-change: transform, opacity;
}

.p1 { left: 4%;  animation-duration: 14s; animation-delay: 0s;   color: var(--yellow); }
.p2 { left: 14%; animation-duration: 18s; animation-delay: 2s;   color: var(--green);  }
.p3 { left: 26%; animation-duration: 11s; animation-delay: 1s;   color: var(--yellow); }
.p4 { left: 40%; animation-duration: 16s; animation-delay: 4s;   color: var(--purple); }
.p5 { left: 55%; animation-duration: 13s; animation-delay: 0.5s; color: var(--yellow); }
.p6 { left: 68%; animation-duration: 10s; animation-delay: 3s;   color: var(--green);  }
.p7 { left: 80%; animation-duration: 17s; animation-delay: 1.5s; color: var(--purple); }
.p8 { left: 91%; animation-duration: 12s; animation-delay: 5s;   color: var(--yellow); }

@keyframes float-up {
  0%   { transform: translateY(110vh) rotate(0deg);   opacity: 0; }
  8%   { opacity: 0.07; }
  50%  { transform: translateY(50vh)  rotate(180deg); }
  92%  { opacity: 0.07; }
  100% { transform: translateY(-10vh) rotate(360deg); opacity: 0; }
}

/* ── NAVBAR ── */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,10,15,0.85);
  -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  animation: slideDown 0.5s ease;
  transition: background 0.3s, border-color 0.3s;
}

:root.light-theme .navbar {
  background: rgba(255,255,255,0.9);
}

@keyframes slideDown {
  from { transform: translateY(-100%); opacity: 0; }
  to   { transform: translateY(0);     opacity: 1; }
}

.nav-inner {
  max-width: 960px; margin: 0 auto;
  display: flex; align-items: center; height: 60px; gap: 14px;
}

.logo {
  font-family: 'Fira Code', monospace;
  background: var(--yellow); color: #111;
  padding: 3px 8px; border-radius: 6px;
  font-size: 0.85rem; font-weight: 700;
  flex-shrink: 0;
  transition: transform 0.2s, box-shadow 0.2s;
}
.logo:hover {
  transform: rotate(-5deg) scale(1.1);
  box-shadow: 0 0 16px rgba(247,223,30,0.5);
}

.nav-title { font-weight: 700; font-size: 0.95rem; }

.back-link {
  margin-left: auto;
  display: flex; align-items: center; gap: 6px;
  color: var(--text-2); font-size: 0.875rem; font-weight: 500;
  padding: 6px 14px;
  border: 1px solid var(--border); border-radius: 8px;
  transition: all 0.25s;
  white-space: nowrap;
  position: relative; overflow: hidden;
}
.back-link::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.04), transparent);
  transform: translateX(-100%);
  transition: transform 0.4s;
}
.back-link:hover::before { transform: translateX(100%); }
.back-link:hover {
  color: var(--text);
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.18);
  transform: translateX(-3px);
}
.back-link svg { transition: transform 0.25s; }
.back-link:hover svg { transform: translateX(-3px); }

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-2);
  transition: all 0.3s;
  margin-left: 12px;
  position: relative;
}

.theme-toggle:hover {
  color: var(--text);
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.18);
  transform: rotate(20deg);
}

.theme-toggle svg {
  position: absolute;
  transition: all 0.3s;
  opacity: 1;
}

.theme-icon-light {
  opacity: 0;
  transform: rotate(180deg) scale(0.8);
}

:root.light-theme .theme-icon-dark {
  opacity: 0;
  transform: rotate(180deg) scale(0.8);
}

:root.light-theme .theme-icon-light {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* ── PAGE HEADER ── */
.page-header {
  position: relative; z-index: 1;
  padding: 56px 24px 36px;
  animation: fadeUp 0.6s ease 0.1s both;
}

.header-inner { max-width: 960px; margin: 0 auto; }

.page-tag {
  display: inline-block;
  background: var(--yellow-dim); color: var(--yellow);
  border: 1px solid rgba(247,223,30,0.25);
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; padding: 4px 12px; border-radius: 999px;
  margin-bottom: 16px;
  animation: fadeUp 0.5s ease 0.2s both;
}

.page-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800; letter-spacing: -0.02em;
  margin-bottom: 10px;
  animation: fadeUp 0.5s ease 0.3s both;
}

.highlight {
  color: var(--yellow);
  position: relative;
}
.highlight::after {
  content: '';
  position: absolute; bottom: 0; left: 0;
  width: 100%; height: 2px;
  background: var(--yellow);
  transform: scaleX(0); transform-origin: left;
  animation: underline-in 0.6s ease 0.9s forwards;
}
@keyframes underline-in {
  to { transform: scaleX(1); }
}

.page-header p {
  color: var(--text-2); font-size: 1rem;
  max-width: 500px; line-height: 1.6;
  animation: fadeUp 0.5s ease 0.4s both;
}

/* ── STATS BAR ── */
.stats-bar {
  position: relative; z-index: 1;
  padding: 0 24px 40px;
  animation: fadeUp 0.5s ease 0.5s both;
}

.stats-inner {
  max-width: 960px; margin: 0 auto;
  display: flex; align-items: stretch;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.stats-inner:hover {
  border-color: rgba(247,223,30,0.15);
  box-shadow: 0 4px 24px rgba(0,0,0,0.25);
}

.stat-item {
  flex: 1;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 20px 28px; gap: 4px;
  cursor: default;
  position: relative;
  transition: background 0.25s, box-shadow 0.25s;
}
.stat-item::after {
  content: '';
  position: absolute; inset: 0;
  border: 1px solid transparent;
  border-radius: 10px;
  transition: border-color 0.25s, box-shadow 0.25s;
  pointer-events: none;
}
.stat-item:hover {
  background: rgba(247,223,30,0.06);
}
.stat-item:hover::after {
  border-color: rgba(247,223,30,0.25);
  box-shadow: inset 0 0 16px rgba(247,223,30,0.04);
}
.stat-item:hover .stat-num {
  transform: scale(1.12) translateY(-1px);
  text-shadow: 0 0 18px rgba(247,223,30,0.5);
}
.stat-item:hover .stat-label { color: var(--text-2); }

.stat-num {
  font-family: 'Fira Code', monospace;
  font-size: 1.6rem; font-weight: 700;
  color: var(--yellow);
  transition: transform 0.25s, text-shadow 0.25s;
}

.stat-label {
  font-size: 0.72rem; color: var(--text-3);
  text-transform: uppercase; letter-spacing: 0.08em;
  transition: color 0.25s;
}

.stat-divider {
  width: 1px;
  background: var(--border);
  align-self: stretch;
  margin: 12px 0;
}

/* ── MAIN CONTENT ── */
.mcq-main {
  position: relative; z-index: 1;
  max-width: 960px; margin: 0 auto;
  padding: 0 24px 80px;
  display: flex; flex-direction: column; gap: 56px;
}

/* ── SECTION ── */
.section-label {
  display: flex; align-items: flex-start; gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.section-icon {
  font-size: 2rem; flex-shrink: 0;
  margin-top: 2px;
  transition: transform 0.3s;
  display: inline-block;
}
.mcq-section:hover .section-icon { transform: scale(1.15) rotate(-5deg); }

.section-title {
  font-size: 1.3rem; font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.section-desc {
  font-size: 0.875rem; color: var(--text-2);
  line-height: 1.5;
}

.section-badge {
  margin-left: auto; flex-shrink: 0;
  font-size: 0.7rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase;
  padding: 4px 10px; border-radius: 999px;
  align-self: flex-start;
}

.section-badge.coming {
  background: rgba(100,116,139,0.15);
  color: var(--text-3);
  border: 1px solid rgba(100,116,139,0.25);
}

.section-badge.live {
  background: var(--green-dim);
  color: var(--green);
  border: 1px solid rgba(34,197,94,0.3);
  animation: pulse-live 2s ease-in-out infinite;
}
@keyframes pulse-live {
  0%, 100% { box-shadow: 0 0 0 0 rgba(34,197,94,0.3); }
  50%       { box-shadow: 0 0 0 6px rgba(34,197,94,0); }
}

/* ── CARD GRID ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 16px;
}
.mock-grid      { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.important-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

/* ── MCQ CARD ── */
.mcq-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 20px;
  display: flex; flex-direction: column; gap: 10px;
  cursor: default;
  position: relative; overflow: hidden;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s, background 0.3s;
  opacity: 0;
  animation: cardFadeIn 0.5s ease forwards;
}

/* Staggered entrance per card */
.card-grid .mcq-card:nth-child(1) { animation-delay: 0.05s; }
.card-grid .mcq-card:nth-child(2) { animation-delay: 0.12s; }
.card-grid .mcq-card:nth-child(3) { animation-delay: 0.19s; }
.card-grid .mcq-card:nth-child(4) { animation-delay: 0.26s; }
.card-grid .mcq-card:nth-child(5) { animation-delay: 0.33s; }

@keyframes cardFadeIn {
  from { opacity: 0; transform: translateY(24px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0)    scale(1);    }
}

/* Shine sweep on hover */
.mcq-card::before {
  content: '';
  position: absolute; top: 0; left: -100%;
  width: 60%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.04), transparent);
  transition: left 0.5s ease;
  pointer-events: none;
}
.mcq-card:hover::before { left: 150%; }

/* Top glow accent line */
.mcq-card::after {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--yellow), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}
.mcq-card:not(.placeholder):hover::after { opacity: 1; }

.mcq-card:not(.placeholder):hover {
  border-color: rgba(247,223,30,0.3);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.4), 0 0 0 1px rgba(247,223,30,0.08);
  background: #111120;
}

:root.light-theme .mcq-card:not(.placeholder):hover {
  border-color: rgba(243,156,18,0.3);
  box-shadow: 0 12px 32px rgba(0,0,0,0.08), 0 0 0 1px rgba(243,156,18,0.1);
  background: #fafbfc;
}

.mcq-card.placeholder { opacity: 0.55; }
.mcq-card.placeholder.visible { animation: cardFadeIn 0.5s ease forwards; }

.mock-card      { border-color: rgba(167,139,250,0.15); }
.important-card { border-color: rgba(247,223,30,0.15); }

.mock-card:hover {
  border-color: rgba(167,139,250,0.35) !important;
  box-shadow: 0 12px 32px rgba(0,0,0,0.4), 0 0 0 1px rgba(167,139,250,0.1) !important;
}
.mock-card::after {
  background: linear-gradient(90deg, transparent, var(--purple), transparent) !important;
}

.important-card:hover {
  border-color: rgba(247,223,30,0.35) !important;
}

/* SET Cards - Different Hover Colors */
.set1-card { border-color: rgba(34,197,94,0.15); }
.set1-card:hover {
  border-color: rgba(34,197,94,0.35) !important;
  box-shadow: 0 12px 32px rgba(0,0,0,0.4), 0 0 0 1px rgba(34,197,94,0.1) !important;
}
.set1-card:hover::after {
  background: linear-gradient(90deg, transparent, var(--green), transparent) !important;
}
.set1-card:hover .card-title { color: var(--green) !important; }
.set1-card:hover .card-num {
  color: var(--green) !important;
  background: var(--green-dim) !important;
}
.set1-card:hover .card-btn:not(:disabled) {
  background: var(--green-dim) !important;
  border-color: rgba(34,197,94,0.4) !important;
  color: var(--green) !important;
  box-shadow: 0 4px 16px rgba(34,197,94,0.12) !important;
}

.set2-card { border-color: rgba(59,130,246,0.15); }
.set2-card:hover {
  border-color: rgba(59,130,246,0.35) !important;
  box-shadow: 0 12px 32px rgba(0,0,0,0.4), 0 0 0 1px rgba(59,130,246,0.1) !important;
}
.set2-card:hover::after {
  background: linear-gradient(90deg, transparent, #3b82f6, transparent) !important;
}
.set2-card:hover .card-title { color: #3b82f6 !important; }
.set2-card:hover .card-num {
  color: #3b82f6 !important;
  background: rgba(59,130,246,0.12) !important;
}
.set2-card:hover .card-btn:not(:disabled) {
  background: rgba(59,130,246,0.12) !important;
  border-color: rgba(59,130,246,0.4) !important;
  color: #3b82f6 !important;
  box-shadow: 0 4px 16px rgba(59,130,246,0.12) !important;
}

.set3-card { border-color: rgba(239,68,68,0.15); }
.set3-card:hover {
  border-color: rgba(239,68,68,0.35) !important;
  box-shadow: 0 12px 32px rgba(0,0,0,0.4), 0 0 0 1px rgba(239,68,68,0.1) !important;
}
.set3-card:hover::after {
  background: linear-gradient(90deg, transparent, #ef4444, transparent) !important;
}
.set3-card:hover .card-title { color: #ef4444 !important; }
.set3-card:hover .card-num {
  color: #ef4444 !important;
  background: rgba(239,68,68,0.12) !important;
}
.set3-card:hover .card-btn:not(:disabled) {
  background: rgba(239,68,68,0.12) !important;
  border-color: rgba(239,68,68,0.4) !important;
  color: #ef4444 !important;
  box-shadow: 0 4px 16px rgba(239,68,68,0.12) !important;
}

/* ── CARD TOP ── */
.card-top {
  display: flex; align-items: center; justify-content: space-between;
}

.card-num {
  font-family: 'Fira Code', monospace;
  font-size: 0.75rem; font-weight: 700;
  color: var(--text-3);
  background: var(--bg3);
  padding: 3px 8px; border-radius: 6px;
  transition: color 0.2s, background 0.2s;
}
.mcq-card:hover .card-num {
  color: var(--yellow);
  background: var(--yellow-dim);
}
.mock-card:hover .card-num {
  color: var(--purple) !important;
  background: var(--purple-dim) !important;
}

.mock-num { color: var(--purple); }
.imp-num  { color: var(--yellow); font-size: 1rem; background: transparent; padding: 0; }

.card-status { font-size: 0.85rem; }

/* ── CARD BODY ── */
.card-title {
  font-size: 0.95rem; font-weight: 700;
  line-height: 1.3;
  transition: color 0.2s;
}
.mcq-card:not(.placeholder):hover .card-title { color: var(--yellow); }
.mock-card:hover .card-title                  { color: var(--purple) !important; }

.card-sub {
  font-size: 0.78rem; color: var(--text-3);
  line-height: 1.5;
}

/* ── CARD META ── */
.card-meta {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-top: 2px;
}

.meta-tag {
  font-size: 0.68rem; font-weight: 600;
  color: var(--text-3);
  background: var(--bg3);
  border: 1px solid var(--border);
  padding: 2px 8px; border-radius: 999px;
  letter-spacing: 0.04em;
  transition: all 0.2s;
}
.mcq-card:hover .meta-tag {
  border-color: rgba(247,223,30,0.2);
  color: var(--text-2);
}
.mock-card:hover .meta-tag { border-color: rgba(167,139,250,0.2) !important; }

/* ── CARD BUTTON ── */
.card-btn {
  margin-top: auto;
  padding: 9px 16px;
  border-radius: 8px;
  font-size: 0.82rem; font-weight: 600;
  cursor: pointer;
  transition: all 0.25s;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  position: relative; overflow: hidden;
  display: flex; align-items: center; justify-content: center; gap: 6px;
}
.card-btn::after {
  content: '→';
  position: absolute; right: -20px;
  transition: right 0.25s, opacity 0.25s;
  opacity: 0;
}
.card-btn:not(:disabled):hover::after {
  right: 12px; opacity: 1;
}
.card-btn:not(:disabled):hover {
  background: var(--yellow-dim);
  border-color: rgba(247,223,30,0.4);
  color: var(--yellow);
  padding-right: 28px;
  box-shadow: 0 4px 16px rgba(247,223,30,0.12);
  transform: translateY(-1px);
}

.card-btn:disabled {
  cursor: not-allowed;
  opacity: 0.4;
}
.card-btn:disabled::after { display: none; }

.card-btn:not(:disabled):active { transform: scale(0.97); }

.mock-btn:not(:disabled):hover {
  background: var(--purple-dim) !important;
  border-color: rgba(167,139,250,0.4) !important;
  color: var(--purple) !important;
  box-shadow: 0 4px 16px rgba(167,139,250,0.12) !important;
}

.imp-btn:not(:disabled):hover {
  background: var(--yellow-dim);
  border-color: rgba(247,223,30,0.4);
  color: var(--yellow);
}

:root.light-theme .card-btn:not(:disabled):hover {
  background: var(--yellow-dim);
  border-color: rgba(243,156,18,0.4);
  color: var(--yellow);
  box-shadow: 0 4px 16px rgba(243,156,18,0.15);
}

:root.light-theme .mock-btn:not(:disabled):hover {
  background: var(--purple-dim) !important;
  border-color: rgba(142,68,173,0.4) !important;
  color: var(--purple) !important;
  box-shadow: 0 4px 16px rgba(142,68,173,0.15) !important;
}

/* ── FOOTER ── */
.page-footer {
  position: relative; z-index: 1;
  border-top: 1px solid var(--border);
  padding: 24px;
}

.footer-inner {
  max-width: 960px; margin: 0 auto;
  display: flex; align-items: center; gap: 12px;
  font-size: 0.85rem; color: var(--text-3);
  flex-wrap: wrap;
}

.footer-link {
  margin-left: auto;
  color: var(--text-2); font-size: 0.82rem; font-weight: 500;
  padding: 5px 12px;
  border: 1px solid var(--border); border-radius: 8px;
  transition: all 0.25s;
}
.footer-link:hover {
  color: var(--text);
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.15);
  transform: translateX(-3px);
}

/* ── SHARED FADE-UP ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── SCROLL REVEAL ── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── RESPONSIVE ── */
@media (max-width: 600px) {
  .page-header  { padding: 36px 16px 24px; }
  .stats-bar    { padding: 0 16px 32px; }
  .mcq-main     { padding: 0 16px 60px; }
  .stat-item    { padding: 12px 18px; }
  .stat-num     { font-size: 1.2rem; }
  .card-grid,
  .mock-grid,
  .important-grid { grid-template-columns: 1fr; }
  .section-badge  { margin-left: 0; }
}