/* ============================================================
   CODEQUIZ — PREMIUM DESIGN SYSTEM
   Dark Developer Aesthetic · VS Code Inspired · Glassmorphism
============================================================ */

/* ── CSS Variables ── */
:root {
  --blue:        #3B82F6;
  --blue-light:  #60A5FA;
  --blue-dark:   #1D4ED8;
  --purple:      #8B5CF6;
  --purple-light:#A78BFA;
  --bg:          #0F172A;
  --bg-2:        #111827;
  --card:        #1E293B;
  --card-2:      #243044;
  --text:        #F8FAFC;
  --text-2:      #CBD5E1;
  --text-3:      #94A3B8;
  --text-4:      #64748B;
  --green:       #22C55E;
  --green-dim:   #16A34A;
  --red:         #EF4444;
  --red-dim:     #DC2626;
  --yellow:      #F59E0B;
  --cyan:        #06B6D4;
  --border:      rgba(255,255,255,0.07);
  --border-2:    rgba(255,255,255,0.12);
  --glow-blue:   rgba(59,130,246,0.25);
  --glow-purple: rgba(139,92,246,0.25);
  --radius-sm:   8px;
  --radius:      14px;
  --radius-lg:   20px;
  --radius-xl:   28px;
  --shadow:      0 4px 24px rgba(0,0,0,0.4);
  --shadow-lg:   0 8px 48px rgba(0,0,0,0.6);
  --font-display:'Syne', sans-serif;
  --font-body:   'Plus Jakarta Sans', sans-serif;
  --font-mono:   'JetBrains Mono', monospace;
  --nav-h:       68px;
  --transition:  0.22s cubic-bezier(0.4,0,0.2,1);
}

[data-theme="light"] {
  --bg:    #F1F5F9;
  --bg-2:  #E2E8F0;
  --card:  #FFFFFF;
  --card-2:#F8FAFC;
  --text:  #0F172A;
  --text-2:#1E293B;
  --text-3:#475569;
  --text-4:#94A3B8;
  --border:rgba(0,0,0,0.08);
  --border-2:rgba(0,0,0,0.14);
  --shadow:0 4px 24px rgba(0,0,0,0.1);
  --shadow-lg:0 8px 48px rgba(0,0,0,0.15);
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, select { font-family: inherit; }
img { max-width: 100%; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--card-2); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-4); }

/* ── Utility Classes ── */
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.text-gradient {
  background: linear-gradient(135deg, var(--blue), var(--purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.glass-card {
  background: rgba(30,41,59,0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-lg);
}
[data-theme="light"] .glass-card {
  background: rgba(255,255,255,0.85);
}
.hide-mobile { display: inline; }
.page { display: none; min-height: 100vh; }
.page.active { display: block; }

/* ── Buttons ── */
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  color: #fff;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  position: relative; overflow: hidden;
}
.btn-primary::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--purple), var(--blue));
  opacity: 0; transition: opacity var(--transition);
}
.btn-primary:hover::before { opacity: 1; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px var(--glow-blue); }
.btn-primary:active { transform: translateY(0); }
.btn-primary svg { width: 18px; height: 18px; position: relative; z-index: 1; }
.btn-primary span, .btn-primary > * { position: relative; z-index: 1; }

.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px;
  background: rgba(59,130,246,0.12);
  color: var(--blue-light);
  border: 1px solid rgba(59,130,246,0.3);
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
}
.btn-secondary:hover {
  background: rgba(59,130,246,0.2);
  border-color: var(--blue);
  transform: translateY(-2px);
}
.btn-secondary svg { width: 18px; height: 18px; }

.btn-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px;
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
}
.btn-ghost:hover {
  background: var(--card);
  color: var(--text);
  border-color: var(--border-2);
  transform: translateY(-2px);
}
.btn-ghost svg { width: 18px; height: 18px; }

.btn-danger {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px;
  background: linear-gradient(135deg, var(--red), #B91C1C);
  color: #fff;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
}
.btn-danger:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(239,68,68,0.3); }

.btn-lg { padding: 16px 32px; font-size: 1.05rem; }
.btn-full { width: 100%; justify-content: center; }
.btn-glow { box-shadow: 0 0 32px var(--glow-blue); }

.btn-back {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px;
  background: var(--card);
  color: var(--text-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
}
.btn-back:hover { color: var(--text); border-color: var(--border-2); }
.btn-back svg { width: 16px; height: 16px; }

/* ============================================================
   NAVBAR
============================================================ */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-h);
  background: rgba(15,23,42,0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
  transition: all var(--transition);
}
[data-theme="light"] .navbar {
  background: rgba(241,245,249,0.9);
}
.navbar.scrolled {
  background: rgba(15,23,42,0.97);
  box-shadow: 0 4px 32px rgba(0,0,0,0.3);
}
.nav-container {
  max-width: 1280px; margin: 0 auto; padding: 0 24px;
  height: 100%;
  display: flex; align-items: center; gap: 32px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  flex-shrink: 0;
}
.logo-icon { font-size: 1.5rem; }
.logo-text {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}
.logo-accent { color: var(--blue); }

.nav-links {
  display: flex; align-items: center; gap: 4px;
  flex: 1;
}
.nav-link {
  padding: 8px 14px;
  color: var(--text-3);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  position: relative;
}
.nav-link:hover, .nav-link.active {
  color: var(--text);
  background: rgba(255,255,255,0.06);
}
.nav-link.active::after {
  content: '';
  position: absolute; bottom: 4px; left: 50%; transform: translateX(-50%);
  width: 4px; height: 4px;
  background: var(--blue);
  border-radius: 50%;
}

.nav-actions {
  display: flex; align-items: center; gap: 12px;
  flex-shrink: 0;
}

.search-wrapper {
  position: relative;
}
.search-icon {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  width: 16px; height: 16px;
  color: var(--text-4);
  pointer-events: none;
}
.nav-search {
  width: 220px;
  padding: 9px 12px 9px 36px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.875rem;
  transition: all var(--transition);
  outline: none;
}
.nav-search:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
  width: 260px;
}
.nav-search::placeholder { color: var(--text-4); }

.search-dropdown {
  position: absolute; top: calc(100% + 8px); left: 0; right: 0;
  background: var(--card);
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  display: none;
  z-index: 100;
}
.search-dropdown.open { display: block; }
.search-item {
  padding: 12px 16px;
  display: flex; align-items: center; gap: 12px;
  cursor: pointer;
  transition: background var(--transition);
  font-size: 0.875rem;
}
.search-item:hover { background: var(--card-2); }
.search-item-icon { font-size: 1.1rem; }
.search-item-name { color: var(--text); font-weight: 500; }
.search-item-sub { color: var(--text-4); font-size: 0.8rem; }

.theme-toggle {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  transition: all var(--transition);
}
.theme-toggle:hover { border-color: var(--border-2); transform: rotate(20deg); }

.btn-start-nav {
  display: flex; align-items: center; gap: 8px;
  padding: 9px 20px;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  color: #fff;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.875rem;
  transition: all var(--transition);
}
.btn-start-nav:hover { transform: translateY(-1px); box-shadow: 0 4px 20px var(--glow-blue); }
.btn-start-nav svg { width: 15px; height: 15px; }

.hamburger {
  display: none;
  flex-direction: column; gap: 5px;
  width: 36px; height: 36px;
  align-items: center; justify-content: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.hamburger span {
  display: block; width: 18px; height: 2px;
  background: var(--text-2);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============================================================
   HERO SECTION
============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  padding: calc(var(--nav-h) + 60px) 24px 80px;
  overflow: hidden;
}

#particleCanvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}
.hero-glow-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(59,130,246,0.18) 0%, transparent 70%);
  top: -100px; left: -100px;
  animation: glowPulse 6s ease-in-out infinite;
}
.hero-glow-2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(139,92,246,0.15) 0%, transparent 70%);
  bottom: -50px; right: -50px;
  animation: glowPulse 8s ease-in-out infinite reverse;
}
.hero-glow-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(6,182,212,0.1) 0%, transparent 70%);
  top: 50%; left: 50%; transform: translate(-50%,-50%);
  animation: glowPulse 10s ease-in-out infinite;
}
@keyframes glowPulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.1); }
}

.hero-content {
  position: relative; z-index: 2;
  text-align: center;
  max-width: 860px;
  animation: heroFadeIn 0.8s ease-out;
}
@keyframes heroFadeIn {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 18px;
  background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.25);
  border-radius: 99px;
  font-size: 0.85rem;
  color: var(--blue-light);
  font-weight: 500;
  margin-bottom: 28px;
  animation: heroFadeIn 0.8s ease-out 0.1s both;
}
.badge-dot {
  width: 8px; height: 8px;
  background: var(--green);
  border-radius: 50%;
  animation: blink 2s ease-in-out infinite;
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 24px;
  animation: heroFadeIn 0.8s ease-out 0.2s both;
}
.hero-title-gradient {
  background: linear-gradient(135deg, var(--blue-light), var(--purple-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-3);
  line-height: 1.7;
  margin-bottom: 40px;
  animation: heroFadeIn 0.8s ease-out 0.3s both;
}

.hero-actions {
  display: flex; align-items: center; justify-content: center; gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
  animation: heroFadeIn 0.8s ease-out 0.4s both;
}

.hero-stats {
  display: flex; align-items: center; justify-content: center; gap: 0;
  background: rgba(30,41,59,0.6);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-xl);
  padding: 20px 40px;
  flex-wrap: wrap;
  gap: 0;
  animation: heroFadeIn 0.8s ease-out 0.5s both;
}
.hero-stat {
  display: flex; flex-direction: column; align-items: center;
  padding: 0 32px;
}
.stat-num {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}
.stat-label {
  font-size: 0.8rem;
  color: var(--text-4);
  font-weight: 500;
  margin-top: 2px;
}
.stat-divider {
  width: 1px; height: 40px;
  background: var(--border-2);
}

/* Floating code snippets */
.floating-code {
  position: absolute;
  background: rgba(30,41,59,0.85);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  padding: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 1;
  box-shadow: var(--shadow);
}
.floating-code pre { margin: 0; }
.floating-code code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 16px 20px !important;
  display: block;
}
.fc-1 {
  top: 18%; right: 4%;
  animation: floatCode 8s ease-in-out infinite;
  opacity: 0.75;
}
.fc-2 {
  bottom: 22%; left: 3%;
  animation: floatCode 10s ease-in-out infinite reverse;
  opacity: 0.65;
}
.fc-3 {
  top: 60%; right: 6%;
  animation: floatCode 12s ease-in-out infinite 2s;
  opacity: 0.55;
}
@keyframes floatCode {
  0%, 100% { transform: translateY(0) rotate(-1deg); }
  50% { transform: translateY(-16px) rotate(1deg); }
}

/* ============================================================
   SECTIONS COMMON
============================================================ */
.section {
  padding: 100px 0;
}
.section-header {
  text-align: center;
  margin-bottom: 60px;
}
.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.2);
  border-radius: 99px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--blue-light);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 16px;
}
.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-3);
  max-width: 560px;
  margin: 0 auto;
}

/* ============================================================
   CATEGORIES GRID
============================================================ */
.categories-section { background: var(--bg-2); }

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}

.category-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  position: relative;
  overflow: hidden;
  group: true;
}
.category-card::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--cat-color-a, #3B82F6), var(--cat-color-b, #8B5CF6));
  opacity: 0;
  transition: opacity 0.3s;
}
.category-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-2);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 40px var(--cat-glow, rgba(59,130,246,0.2));
}
.category-card:hover::before { opacity: 0.06; }

.cat-icon-wrap {
  width: 64px; height: 64px;
  margin: 0 auto 16px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem;
  background: linear-gradient(135deg, var(--cat-color-a, #3B82F6), var(--cat-color-b, #8B5CF6));
  box-shadow: 0 8px 24px var(--cat-glow, rgba(59,130,246,0.3));
  transition: all 0.3s;
  position: relative; z-index: 1;
}
.category-card:hover .cat-icon-wrap {
  transform: scale(1.1) rotate(-5deg);
  box-shadow: 0 12px 32px var(--cat-glow, rgba(59,130,246,0.4));
}

.cat-name {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
  position: relative; z-index: 1;
}
.cat-count {
  font-size: 0.8rem;
  color: var(--text-4);
  margin-bottom: 12px;
  position: relative; z-index: 1;
}
.cat-diff-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 99px;
  font-size: 0.72rem;
  font-weight: 600;
  margin-bottom: 16px;
  position: relative; z-index: 1;
}
.diff-beginner { background: rgba(34,197,94,0.15); color: var(--green); }
.diff-intermediate { background: rgba(245,158,11,0.15); color: var(--yellow); }
.diff-advanced { background: rgba(239,68,68,0.15); color: var(--red); }

.cat-start-btn {
  display: flex; align-items: center; justify-content: center; gap: 6px;
  width: 100%;
  padding: 9px 16px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition);
  position: relative; z-index: 1;
}
.category-card:hover .cat-start-btn {
  background: linear-gradient(135deg, var(--cat-color-a, #3B82F6), var(--cat-color-b, #8B5CF6));
  border-color: transparent;
  color: #fff;
}
.cat-start-btn svg { width: 14px; height: 14px; }

/* ============================================================
   POPULAR QUIZZES
============================================================ */
.popular-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.popular-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  cursor: pointer;
  transition: all var(--transition);
  display: flex; flex-direction: column; gap: 16px;
}
.popular-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-2);
  box-shadow: var(--shadow);
}
.popular-card-header {
  display: flex; align-items: center; justify-content: space-between;
}
.popular-cat-badge {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-2);
}
.popular-cat-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.popular-attempts {
  font-size: 0.8rem;
  color: var(--text-4);
}
.popular-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
}
.popular-meta {
  display: flex; align-items: center; gap: 12px;
  flex-wrap: wrap;
}
.popular-tag {
  padding: 4px 10px;
  background: var(--card-2);
  border-radius: 99px;
  font-size: 0.78rem;
  color: var(--text-3);
}
.popular-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.popular-rating {
  display: flex; align-items: center; gap: 4px;
  font-size: 0.85rem;
  color: var(--yellow);
  font-weight: 600;
}
.popular-start {
  display: flex; align-items: center; gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--blue-light);
  transition: gap var(--transition);
}
.popular-card:hover .popular-start { gap: 10px; }
.popular-start svg { width: 14px; height: 14px; }

/* ============================================================
   DAILY CHALLENGE
============================================================ */
.daily-section { background: var(--bg-2); }

.daily-challenge-card {
  background: var(--card);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-xl);
  padding: 48px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  position: relative;
  overflow: hidden;
}
.daily-challenge-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--purple), var(--cyan));
}

.daily-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px;
  background: rgba(245,158,11,0.12);
  border: 1px solid rgba(245,158,11,0.25);
  border-radius: 99px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--yellow);
  margin-bottom: 20px;
}
.daily-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}
.daily-desc {
  color: var(--text-3);
  margin-bottom: 20px;
  line-height: 1.6;
}
.daily-meta {
  display: flex; gap: 8px; flex-wrap: wrap;
  margin-bottom: 20px;
}
.daily-tag {
  padding: 5px 12px;
  background: var(--card-2);
  border-radius: 99px;
  font-size: 0.8rem;
  color: var(--text-3);
  font-weight: 500;
}
.daily-timer {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.9rem;
  color: var(--text-3);
  margin-bottom: 24px;
}
.daily-timer svg { width: 16px; height: 16px; color: var(--blue); }
.countdown-text {
  font-family: var(--font-mono);
  color: var(--blue-light);
  font-weight: 600;
}

.daily-code-preview {
  background: #1a1f2e;
  border: 1px solid var(--border-2);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.code-header {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px;
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid var(--border);
}
.code-dots { display: flex; gap: 6px; }
.code-dots span {
  width: 12px; height: 12px; border-radius: 50%;
}
.code-dots span:nth-child(1) { background: #FF5F57; }
.code-dots span:nth-child(2) { background: #FFBD2E; }
.code-dots span:nth-child(3) { background: #28CA41; }
.code-filename {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-4);
}

/* ============================================================
   LEADERBOARD
============================================================ */
.leaderboard-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: start;
}

.leaderboard-table-wrap {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
}
.leaderboard-table th {
  padding: 14px 20px;
  text-align: left;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-4);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
}
.leaderboard-table td {
  padding: 14px 20px;
  font-size: 0.9rem;
  color: var(--text-2);
  border-bottom: 1px solid var(--border);
}
.leaderboard-table tr:last-child td { border-bottom: none; }
.leaderboard-table tr:hover td { background: rgba(255,255,255,0.02); }

.rank-badge {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.85rem;
}
.rank-1 { background: linear-gradient(135deg, #F59E0B, #D97706); color: #fff; }
.rank-2 { background: linear-gradient(135deg, #94A3B8, #64748B); color: #fff; }
.rank-3 { background: linear-gradient(135deg, #CD7F32, #A0522D); color: #fff; }
.rank-other { background: var(--card-2); color: var(--text-3); }

.dev-name {
  display: flex; align-items: center; gap: 10px;
  font-weight: 600;
  color: var(--text);
}
.dev-avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem;
}

.score-pill {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 99px;
  font-size: 0.8rem;
  font-weight: 700;
  background: rgba(34,197,94,0.12);
  color: var(--green);
}

.leaderboard-podium {
  display: flex; align-items: flex-end; gap: 12px;
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  min-width: 280px;
}
.podium-card {
  flex: 1;
  display: flex; flex-direction: column; align-items: center;
  padding: 16px 12px;
  border-radius: var(--radius);
  background: var(--card-2);
  border: 1px solid var(--border);
  text-align: center;
  transition: all var(--transition);
}
.podium-1 {
  background: linear-gradient(135deg, rgba(245,158,11,0.15), rgba(217,119,6,0.1));
  border-color: rgba(245,158,11,0.3);
  transform: translateY(-16px);
}
.podium-crown { font-size: 1.4rem; margin-bottom: 4px; }
.podium-avatar { font-size: 2rem; margin-bottom: 8px; }
.podium-name { font-size: 0.82rem; font-weight: 600; color: var(--text); margin-bottom: 4px; }
.podium-score { font-family: var(--font-display); font-size: 1.1rem; font-weight: 800; color: var(--green); }
.podium-rank { font-size: 0.75rem; color: var(--text-4); margin-top: 4px; }

/* ============================================================
   FEATURES GRID
============================================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition);
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-2);
  box-shadow: var(--shadow);
}
.feature-icon {
  width: 52px; height: 52px;
  border-radius: var(--radius);
  background: rgba(var(--icon-color), 0.1);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
  color: var(--icon-color);
  border: 1px solid rgba(255,255,255,0.08);
}
.feature-icon svg { width: 24px; height: 24px; }
.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}
.feature-card p {
  font-size: 0.9rem;
  color: var(--text-3);
  line-height: 1.6;
}

/* ============================================================
   FOOTER
============================================================ */
.footer {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-tagline {
  color: var(--text-3);
  font-size: 0.9rem;
  margin: 16px 0 24px;
  line-height: 1.6;
}
.social-links { display: flex; gap: 12px; }
.social-link {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-3);
  transition: all var(--transition);
}
.social-link:hover {
  color: var(--text);
  border-color: var(--border-2);
  transform: translateY(-2px);
}
.social-link svg { width: 16px; height: 16px; }

.footer-col h4 {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a {
  font-size: 0.875rem;
  color: var(--text-3);
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--text); }

.footer-bottom {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap; gap: 16px;
}
.footer-bottom p { font-size: 0.875rem; color: var(--text-4); }
.footer-bottom-links { display: flex; gap: 24px; }
.footer-bottom-links a { font-size: 0.875rem; color: var(--text-4); transition: color var(--transition); }
.footer-bottom-links a:hover { color: var(--text-3); }

/* ============================================================
   QUIZ SETUP PAGE
============================================================ */
.setup-page {
  padding: calc(var(--nav-h) + 40px) 0 80px;
  min-height: 100vh;
}
.setup-header {
  display: flex; align-items: flex-start; gap: 24px;
  margin-bottom: 48px;
}
.setup-title-wrap { flex: 1; }
.setup-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 8px;
}
.setup-subtitle { color: var(--text-3); font-size: 1rem; }

.setup-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 32px;
  align-items: start;
}

.setup-form { display: flex; flex-direction: column; gap: 32px; }

.setup-section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.setup-section-title {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 20px;
}
.setup-step {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--blue);
  background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.2);
  padding: 3px 8px;
  border-radius: 6px;
}

/* Category Picker */
.category-picker {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 10px;
}
.cat-pick-item {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  padding: 14px 10px;
  background: var(--card-2);
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}
.cat-pick-item:hover {
  border-color: var(--border-2);
  transform: translateY(-2px);
}
.cat-pick-item.selected {
  border-color: var(--blue);
  background: rgba(59,130,246,0.1);
  box-shadow: 0 0 20px rgba(59,130,246,0.15);
}
.cat-pick-icon { font-size: 1.6rem; }
.cat-pick-name { font-size: 0.78rem; font-weight: 600; color: var(--text-2); }

/* Difficulty Picker */
.difficulty-picker {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.diff-option input { display: none; }
.diff-card {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  padding: 20px 16px;
  background: var(--card-2);
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}
.diff-option input:checked + .diff-card {
  border-color: var(--blue);
  background: rgba(59,130,246,0.1);
}
.diff-card:hover { border-color: var(--border-2); }
.diff-icon { font-size: 1.8rem; }
.diff-name { font-weight: 700; color: var(--text); font-size: 0.95rem; }
.diff-desc { font-size: 0.78rem; color: var(--text-4); }

/* Count Picker */
.count-picker {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.count-option input { display: none; }
.count-card {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 20px;
  background: var(--card-2);
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}
.count-option input:checked + .count-card {
  border-color: var(--purple);
  background: rgba(139,92,246,0.1);
}
.count-card:hover { border-color: var(--border-2); }
.count-num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--text);
}
.count-label { font-size: 0.8rem; color: var(--text-4); font-weight: 500; }

/* Mode Picker */
.mode-picker { display: flex; flex-direction: column; gap: 12px; }
.mode-option input { display: none; }
.mode-card {
  display: flex; align-items: center; gap: 16px;
  padding: 18px 20px;
  background: var(--card-2);
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}
.mode-option input:checked + .mode-card {
  border-color: var(--blue);
  background: rgba(59,130,246,0.08);
}
.mode-card:hover { border-color: var(--border-2); }
.mode-icon { font-size: 1.8rem; flex-shrink: 0; }
.mode-name { font-weight: 700; color: var(--text); font-size: 0.95rem; }
.mode-desc { font-size: 0.82rem; color: var(--text-4); margin-top: 2px; }

/* Timer Picker */
.timer-picker {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.timer-option input { display: none; }
.timer-card {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 16px;
  background: var(--card-2);
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}
.timer-option input:checked + .timer-card {
  border-color: var(--cyan);
  background: rgba(6,182,212,0.1);
}
.timer-card:hover { border-color: var(--border-2); }
.timer-num {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text);
}
.timer-unit { font-size: 0.78rem; color: var(--text-4); }

/* Setup Preview */
.setup-preview { display: flex; flex-direction: column; gap: 16px; position: sticky; top: calc(var(--nav-h) + 20px); }

.preview-card { padding: 28px; }
.preview-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px;
}
.preview-label { font-size: 0.8rem; font-weight: 600; color: var(--text-4); text-transform: uppercase; letter-spacing: 0.06em; }
.preview-ready { font-size: 0.8rem; color: var(--text-4); }

.preview-category {
  display: flex; align-items: center; gap: 14px;
  padding: 16px;
  background: var(--card-2);
  border-radius: var(--radius);
  margin-bottom: 20px;
}
.preview-cat-icon { font-size: 2rem; }
.preview-cat-name { font-weight: 700; color: var(--text); font-size: 1rem; }
.preview-cat-sub { font-size: 0.8rem; color: var(--text-4); }

.preview-stats {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}
.preview-stat {
  display: flex; flex-direction: column; gap: 4px;
  padding: 12px;
  background: var(--card-2);
  border-radius: var(--radius-sm);
}
.ps-label { font-size: 0.75rem; color: var(--text-4); font-weight: 500; }
.ps-value { font-weight: 700; color: var(--text); font-size: 0.95rem; }

.preview-xp {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 16px;
  background: rgba(245,158,11,0.08);
  border: 1px solid rgba(245,158,11,0.2);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-3);
  margin-bottom: 20px;
}
.preview-xp svg { width: 16px; height: 16px; color: var(--yellow); flex-shrink: 0; }
.preview-xp strong { color: var(--yellow); }

.xp-card { padding: 20px; }
.xp-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 12px;
  font-size: 0.875rem;
  color: var(--text-2);
  font-weight: 600;
}
.xp-level {
  padding: 3px 10px;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  border-radius: 99px;
  font-size: 0.75rem;
  color: #fff;
  font-weight: 700;
}
.xp-bar-wrap { margin-bottom: 16px; }
.xp-bar {
  height: 8px;
  background: var(--card-2);
  border-radius: 99px;
  overflow: hidden;
  margin-bottom: 6px;
}
.xp-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--purple));
  border-radius: 99px;
  transition: width 1s ease;
}
.xp-text { font-size: 0.78rem; color: var(--text-4); }

.xp-badges { display: flex; gap: 8px; flex-wrap: wrap; }
.badge-chip {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  opacity: 0.35;
  transition: all var(--transition);
  cursor: default;
}
.badge-chip.earned {
  opacity: 1;
  border-color: rgba(245,158,11,0.3);
  background: rgba(245,158,11,0.08);
}

/* ============================================================
   QUIZ PAGE
============================================================ */
.quiz-page { min-height: 100vh; display: flex; flex-direction: column; }

.quiz-topbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15,23,42,0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.quiz-topbar-inner {
  max-width: 1400px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; gap: 24px;
}
.quiz-meta-left { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.quiz-meta-right { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }

.btn-quit {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 14px;
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.2);
  border-radius: var(--radius-sm);
  color: var(--red);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition);
}
.btn-quit:hover { background: rgba(239,68,68,0.2); }
.btn-quit svg { width: 14px; height: 14px; }

.quiz-category-badge {
  padding: 6px 14px;
  background: rgba(59,130,246,0.12);
  border: 1px solid rgba(59,130,246,0.25);
  border-radius: 99px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--blue-light);
}
.quiz-difficulty-badge {
  padding: 6px 14px;
  background: rgba(245,158,11,0.1);
  border: 1px solid rgba(245,158,11,0.2);
  border-radius: 99px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--yellow);
}

.quiz-progress-center {
  flex: 1;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
}
.quiz-progress-bar {
  width: 100%; max-width: 400px;
  height: 6px;
  background: var(--card-2);
  border-radius: 99px;
  overflow: hidden;
}
.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--purple));
  border-radius: 99px;
  transition: width 0.4s ease;
}
.quiz-progress-text { font-size: 0.8rem; color: var(--text-4); font-weight: 500; }

.quiz-score-display {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 14px;
  background: rgba(245,158,11,0.1);
  border: 1px solid rgba(245,158,11,0.2);
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--yellow);
}
.quiz-score-display svg { width: 16px; height: 16px; }

/* Timer Ring */
.timer-display { position: relative; }
.timer-ring-wrap {
  position: relative;
  width: 52px; height: 52px;
  display: flex; align-items: center; justify-content: center;
}
.timer-ring {
  position: absolute; inset: 0;
  transform: rotate(-90deg);
}
.timer-ring-bg {
  fill: none;
  stroke: var(--card-2);
  stroke-width: 3;
}
.timer-ring-fill {
  fill: none;
  stroke: var(--blue);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 113;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 1s linear, stroke 0.5s;
}
.timer-ring-fill.warning { stroke: var(--yellow); }
.timer-ring-fill.danger { stroke: var(--red); animation: timerPulse 0.5s ease-in-out infinite; }
@keyframes timerPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
.timer-text {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text);
  position: relative; z-index: 1;
}

.btn-fullscreen {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-3);
  transition: all var(--transition);
}
.btn-fullscreen:hover { color: var(--text); border-color: var(--border-2); }
.btn-fullscreen svg { width: 16px; height: 16px; }

/* Quiz Body */
.quiz-body {
  flex: 1;
  display: grid;
  grid-template-columns: 240px 1fr;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  padding: 24px;
  gap: 24px;
  align-items: start;
}

/* Sidebar */
.quiz-sidebar {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: sticky;
  top: 80px;
}
.sidebar-header {
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-3);
}
.sidebar-legend {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.75rem;
  color: var(--text-4);
  font-weight: 400;
}
.legend-dot {
  width: 8px; height: 8px; border-radius: 50%;
}
.legend-dot.answered { background: var(--green); }
.legend-dot.skipped { background: var(--red); }
.legend-dot.current { background: var(--blue); }

.question-navigator {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  padding: 14px;
  max-height: 320px;
  overflow-y: auto;
}
.q-nav-btn {
  aspect-ratio: 1;
  display: flex; align-items: center; justify-content: center;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-3);
  cursor: pointer;
  transition: all var(--transition);
}
.q-nav-btn:hover { border-color: var(--border-2); color: var(--text); }
.q-nav-btn.current { background: rgba(59,130,246,0.2); border-color: var(--blue); color: var(--blue-light); }
.q-nav-btn.answered { background: rgba(34,197,94,0.15); border-color: rgba(34,197,94,0.3); color: var(--green); }
.q-nav-btn.skipped { background: rgba(239,68,68,0.12); border-color: rgba(239,68,68,0.25); color: var(--red); }

.sidebar-footer {
  padding: 14px;
  border-top: 1px solid var(--border);
}
.btn-submit-quiz {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%;
  padding: 11px;
  background: linear-gradient(135deg, var(--green-dim), var(--green));
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.875rem;
  transition: all var(--transition);
}
.btn-submit-quiz:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(34,197,94,0.3); }
.btn-submit-quiz svg { width: 16px; height: 16px; }

/* Question Card */
.quiz-main { flex: 1; }

.question-card {
  padding: 36px;
  animation: questionSlide 0.3s ease-out;
}
@keyframes questionSlide {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

.question-header {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 24px;
}
.question-number-badge {
  padding: 6px 14px;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  border-radius: 99px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: #fff;
}
.question-tags { display: flex; gap: 8px; }
.q-tag {
  padding: 5px 12px;
  background: var(--card-2);
  border-radius: 99px;
  font-size: 0.78rem;
  color: var(--text-3);
  font-weight: 500;
}
.q-tag-diff { background: rgba(245,158,11,0.1); color: var(--yellow); }

.question-body { margin-bottom: 28px; }
.question-text {
  font-size: 1.15rem;
  color: var(--text);
  line-height: 1.7;
  font-weight: 500;
  margin-bottom: 20px;
}

.question-code {
  background: #1a1f2e;
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 8px;
}
.copy-btn {
  display: flex; align-items: center; gap: 6px;
  margin-left: auto;
  padding: 4px 10px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.75rem;
  color: var(--text-4);
  transition: all var(--transition);
}
.copy-btn:hover { color: var(--text-2); background: rgba(255,255,255,0.1); }
.copy-btn svg { width: 12px; height: 12px; }

/* Options */
.options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 28px;
}

.option-btn {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 18px 20px;
  background: var(--card-2);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
  width: 100%;
}
.option-btn:hover:not(.disabled) {
  border-color: rgba(59,130,246,0.4);
  background: rgba(59,130,246,0.06);
  transform: translateY(-2px);
}
.option-btn.selected {
  border-color: var(--blue);
  background: rgba(59,130,246,0.1);
  box-shadow: 0 0 20px rgba(59,130,246,0.15);
}
.option-btn.correct {
  border-color: var(--green);
  background: rgba(34,197,94,0.1);
}
.option-btn.wrong {
  border-color: var(--red);
  background: rgba(239,68,68,0.1);
}
.option-btn.disabled { cursor: default; }

.option-letter {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--card);
  border: 1px solid var(--border-2);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-3);
  flex-shrink: 0;
  transition: all 0.2s;
}
.option-btn.selected .option-letter {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}
.option-btn.correct .option-letter {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}
.option-btn.wrong .option-letter {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
}

.option-text {
  font-size: 0.92rem;
  color: var(--text-2);
  line-height: 1.5;
  font-weight: 500;
  padding-top: 4px;
}
.option-code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text);
}

/* Question Footer */
.question-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.btn-nav {
  display: flex; align-items: center; gap: 8px;
  padding: 11px 22px;
  background: var(--card-2);
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  color: var(--text-2);
  font-weight: 600;
  font-size: 0.9rem;
  transition: all var(--transition);
}
.btn-nav:hover { background: var(--card); color: var(--text); }
.btn-nav:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-nav svg { width: 16px; height: 16px; }
.btn-next {
  background: linear-gradient(135deg, var(--blue), var(--purple));
  border-color: transparent;
  color: #fff;
}
.btn-next:hover { transform: translateX(2px); box-shadow: 0 4px 16px var(--glow-blue); }

.question-dots {
  display: flex; gap: 6px;
}
.q-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--card-2);
  transition: all var(--transition);
}
.q-dot.active { background: var(--blue); transform: scale(1.3); }
.q-dot.done { background: var(--green); }

/* ============================================================
   RESULT PAGE
============================================================ */
.result-page {
  padding: calc(var(--nav-h) + 40px) 0 80px;
  min-height: 100vh;
}
.result-layout {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 32px;
  align-items: start;
}

.result-hero {
  display: flex; flex-direction: column; align-items: center;
  text-align: center;
}
.result-rank-badge {
  display: inline-block;
  padding: 8px 20px;
  background: linear-gradient(135deg, rgba(245,158,11,0.2), rgba(217,119,6,0.1));
  border: 1px solid rgba(245,158,11,0.3);
  border-radius: 99px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--yellow);
  margin-bottom: 28px;
  font-family: var(--font-display);
}

.score-circle-wrap {
  position: relative;
  width: 220px; height: 220px;
  margin-bottom: 32px;
}
.score-circle-svg {
  width: 100%; height: 100%;
  transform: rotate(-90deg);
}
.score-circle-bg {
  fill: none;
  stroke: var(--card-2);
  stroke-width: 10;
}
.score-circle-fill {
  fill: none;
  stroke: url(#scoreGrad);
  stroke-width: 10;
  stroke-linecap: round;
  transition: stroke-dashoffset 1.5s cubic-bezier(0.4,0,0.2,1);
}
.score-circle-inner {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.score-big {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
  letter-spacing: -0.04em;
}
.score-total { font-size: 1.2rem; color: var(--text-3); font-weight: 600; }
.score-label { font-size: 0.8rem; color: var(--text-4); margin-top: 4px; }

.result-stats-row {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  width: 100%;
  margin-bottom: 24px;
}
.result-stat-card {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 16px 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.rsc-icon { font-size: 1.2rem; font-weight: 700; }
.rsc-num {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text);
}
.rsc-label { font-size: 0.75rem; color: var(--text-4); }

.result-accuracy-bar {
  width: 100%;
  margin-bottom: 28px;
}
.rab-header {
  display: flex; justify-content: space-between;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-2);
  margin-bottom: 8px;
}
.rab-track {
  height: 10px;
  background: var(--card-2);
  border-radius: 99px;
  overflow: hidden;
}
.rab-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--green));
  border-radius: 99px;
  transition: width 1.5s ease;
}

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

/* Result Details */
.result-details { display: flex; flex-direction: column; gap: 20px; }
.result-chart-card { padding: 24px; }
.result-chart-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
}

.result-xp-earned { padding: 24px; }
.xp-earned-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 12px;
  font-weight: 600;
  color: var(--text-2);
}
.xp-earned-amount {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--yellow);
}
.badges-earned { margin-top: 16px; }
.badge-earned-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px;
  background: rgba(245,158,11,0.08);
  border: 1px solid rgba(245,158,11,0.2);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--text-2);
}
.badge-earned-item span { font-size: 1.2rem; }

/* ============================================================
   REVIEW PAGE
============================================================ */
.review-page {
  padding: calc(var(--nav-h) + 40px) 0 80px;
  min-height: 100vh;
}
.review-header {
  display: flex; align-items: flex-start; gap: 24px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.review-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 6px;
}
.review-subtitle { color: var(--text-3); font-size: 0.95rem; }
.review-filter {
  display: flex; gap: 8px;
  margin-left: auto;
  flex-wrap: wrap;
}
.filter-btn {
  padding: 8px 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 99px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-3);
  transition: all var(--transition);
}
.filter-btn:hover { color: var(--text); border-color: var(--border-2); }
.filter-btn.active {
  background: linear-gradient(135deg, var(--blue), var(--purple));
  border-color: transparent;
  color: #fff;
}

.review-list { display: flex; flex-direction: column; gap: 16px; }

.review-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}
.review-item.correct { border-left: 3px solid var(--green); }
.review-item.wrong { border-left: 3px solid var(--red); }
.review-item.skipped { border-left: 3px solid var(--text-4); }

.review-item-header {
  display: flex; align-items: center; gap: 16px;
  padding: 20px 24px;
  cursor: pointer;
  transition: background var(--transition);
}
.review-item-header:hover { background: rgba(255,255,255,0.02); }

.review-status-icon {
  width: 36px; height: 36px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.status-correct { background: rgba(34,197,94,0.15); color: var(--green); }
.status-wrong { background: rgba(239,68,68,0.12); color: var(--red); }
.status-skipped { background: rgba(148,163,184,0.1); color: var(--text-4); }

.review-q-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-4);
  flex-shrink: 0;
}
.review-q-text {
  flex: 1;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-2);
  line-height: 1.4;
}
.review-expand-icon {
  width: 24px; height: 24px;
  color: var(--text-4);
  transition: transform var(--transition);
  flex-shrink: 0;
}
.review-item.open .review-expand-icon { transform: rotate(180deg); }

.review-item-body {
  display: none;
  padding: 0 24px 24px;
  border-top: 1px solid var(--border);
}
.review-item.open .review-item-body { display: block; }

.review-answers {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 20px 0;
}
.review-answer-box {
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.review-answer-box.user-wrong {
  background: rgba(239,68,68,0.08);
  border-color: rgba(239,68,68,0.25);
}
.review-answer-box.correct-ans {
  background: rgba(34,197,94,0.08);
  border-color: rgba(34,197,94,0.25);
}
.rab-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.user-wrong .rab-label { color: var(--red); }
.correct-ans .rab-label { color: var(--green); }
.rab-value {
  font-size: 0.9rem;
  color: var(--text-2);
  font-weight: 500;
}

.review-explanation {
  padding: 16px;
  background: rgba(59,130,246,0.06);
  border: 1px solid rgba(59,130,246,0.15);
  border-radius: var(--radius);
}
.review-explanation h4 {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--blue-light);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}
.review-explanation p {
  font-size: 0.9rem;
  color: var(--text-3);
  line-height: 1.6;
}

/* ============================================================
   HISTORY PAGE
============================================================ */
.history-page {
  padding: calc(var(--nav-h) + 40px) 0 80px;
  min-height: 100vh;
}
.history-header {
  display: flex; align-items: flex-start; justify-content: space-between;
  margin-bottom: 40px;
  flex-wrap: wrap; gap: 20px;
}
.history-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 8px;
}
.history-subtitle { color: var(--text-3); font-size: 1rem; }

.history-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}
.history-stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex; flex-direction: column; gap: 8px;
  transition: all var(--transition);
}
.history-stat-card:hover { transform: translateY(-3px); border-color: var(--border-2); }
.hsc-icon { font-size: 1.5rem; }
.hsc-num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.03em;
}
.hsc-label { font-size: 0.85rem; color: var(--text-3); font-weight: 500; }
.hsc-trend {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 99px;
  display: inline-block;
  width: fit-content;
}
.trend-up { background: rgba(34,197,94,0.12); color: var(--green); }
.trend-down { background: rgba(239,68,68,0.12); color: var(--red); }

.history-charts-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}
.history-chart-card { padding: 24px; }
.history-chart-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
}

.topics-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
}
.topics-card { padding: 24px; }
.topics-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
}
.topics-list { display: flex; flex-direction: column; gap: 10px; }
.topic-item {
  display: flex; align-items: center; gap: 12px;
}
.topic-name { font-size: 0.875rem; font-weight: 600; color: var(--text-2); min-width: 80px; }
.topic-bar-wrap { flex: 1; height: 8px; background: var(--card-2); border-radius: 99px; overflow: hidden; }
.topic-bar-fill { height: 100%; border-radius: 99px; transition: width 1s ease; }
.strong-fill { background: linear-gradient(90deg, var(--green-dim), var(--green)); }
.weak-fill { background: linear-gradient(90deg, var(--red-dim), var(--red)); }
.topic-pct { font-size: 0.78rem; font-weight: 700; min-width: 36px; text-align: right; }

/* History Table */
.history-table-card { padding: 24px; }
.table-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap; gap: 12px;
}
.table-header h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}
.table-actions { display: flex; gap: 10px; }
.table-search {
  padding: 9px 14px;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.875rem;
  outline: none;
  transition: border-color var(--transition);
  width: 200px;
}
.table-search:focus { border-color: var(--blue); }
.table-filter {
  padding: 9px 14px;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.875rem;
  outline: none;
  cursor: pointer;
}

.table-wrap { overflow-x: auto; }
.history-table {
  width: 100%;
  border-collapse: collapse;
}
.history-table th {
  padding: 12px 16px;
  text-align: left;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-4);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.history-table td {
  padding: 14px 16px;
  font-size: 0.875rem;
  color: var(--text-2);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.history-table tr:last-child td { border-bottom: none; }
.history-table tr:hover td { background: rgba(255,255,255,0.02); }

.score-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 99px;
  font-size: 0.8rem;
  font-weight: 700;
}
.score-high { background: rgba(34,197,94,0.12); color: var(--green); }
.score-mid { background: rgba(245,158,11,0.12); color: var(--yellow); }
.score-low { background: rgba(239,68,68,0.12); color: var(--red); }

.cat-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px;
  background: var(--card-2);
  border-radius: 99px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-2);
}
.btn-review-small {
  padding: 6px 14px;
  background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.2);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--blue-light);
  transition: all var(--transition);
}
.btn-review-small:hover { background: rgba(59,130,246,0.2); }

/* ============================================================
   MODALS
============================================================ */
.modal-overlay {
  position: fixed; inset: 0; z-index: 2000;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  opacity: 0; pointer-events: none;
  transition: opacity var(--transition);
}
.modal-overlay.open { opacity: 1; pointer-events: all; }

.modal {
  max-width: 420px; width: 100%;
  padding: 36px;
  text-align: center;
  animation: modalIn 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
@keyframes modalIn {
  from { transform: scale(0.85) translateY(20px); opacity: 0; }
  to { transform: scale(1) translateY(0); opacity: 1; }
}
.modal-icon { font-size: 3rem; margin-bottom: 16px; }
.modal h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 10px;
}
.modal p { color: var(--text-3); font-size: 0.95rem; margin-bottom: 28px; }
.modal-actions { display: flex; gap: 12px; justify-content: center; }

/* ============================================================
   TOAST
============================================================ */
.toast {
  position: fixed; bottom: 24px; right: 24px; z-index: 3000;
  display: flex; align-items: center; gap: 10px;
  padding: 14px 20px;
  background: var(--card);
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  transform: translateY(80px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast-icon { font-size: 1.1rem; }

/* ============================================================
   LOADING OVERLAY
============================================================ */
.loading-overlay {
  position: fixed; inset: 0; z-index: 4000;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 20px;
  opacity: 0; pointer-events: none;
  transition: opacity 0.3s;
}
.loading-overlay.show { opacity: 1; pointer-events: all; }
.loading-spinner {
  width: 48px; height: 48px;
  border: 3px solid var(--card-2);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { color: var(--text-3); font-size: 0.95rem; }

/* ============================================================
   ANIMATIONS
============================================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

.animate-in { animation: fadeInUp 0.5s ease-out both; }
.animate-in-delay-1 { animation-delay: 0.1s; }
.animate-in-delay-2 { animation-delay: 0.2s; }
.animate-in-delay-3 { animation-delay: 0.3s; }

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   RESPONSIVE — TABLET
============================================================ */
@media (max-width: 1024px) {
  .leaderboard-grid { grid-template-columns: 1fr; }
  .leaderboard-podium { display: none; }
  .result-layout { grid-template-columns: 1fr; }
  .history-charts-row { grid-template-columns: 1fr 1fr; }
  .setup-layout { grid-template-columns: 1fr; }
  .setup-preview { position: static; }
  .daily-challenge-card { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* ============================================================
   RESPONSIVE — MOBILE
============================================================ */
@media (max-width: 768px) {
  :root { --nav-h: 60px; }
  .hide-mobile { display: none; }

  .nav-links { display: none; position: fixed; top: var(--nav-h); left: 0; right: 0; bottom: 0; background: var(--bg); flex-direction: column; padding: 24px; gap: 8px; z-index: 999; overflow-y: auto; }
  .nav-links.open { display: flex; }
  .nav-link { padding: 14px 16px; font-size: 1rem; border-radius: var(--radius); }
  .hamburger { display: flex; }
  .nav-search { display: none; }
  .search-wrapper { display: none; }
  .btn-start-nav span { display: none; }

  .hero { padding: calc(var(--nav-h) + 40px) 20px 60px; }
  .hero-stats { padding: 16px 20px; gap: 0; }
  .hero-stat { padding: 0 16px; }
  .stat-num { font-size: 1.4rem; }
  .floating-code { display: none; }

  .categories-grid { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .category-card { padding: 20px 12px; }
  .cat-icon-wrap { width: 48px; height: 48px; font-size: 1.5rem; }

  .popular-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }

  .setup-header { flex-direction: column; }
  .difficulty-picker { grid-template-columns: 1fr; }
  .timer-picker { grid-template-columns: repeat(2, 1fr); }
  .category-picker { grid-template-columns: repeat(3, 1fr); }

  .quiz-body { grid-template-columns: 1fr; padding: 16px; }
  .quiz-sidebar { position: static; }
  .question-navigator { max-height: 120px; }
  .options-grid { grid-template-columns: 1fr; }
  .question-card { padding: 20px; }
  .quiz-topbar-inner { flex-wrap: wrap; gap: 10px; }
  .quiz-meta-left { order: 1; }
  .quiz-progress-center { order: 3; width: 100%; }
  .quiz-meta-right { order: 2; margin-left: auto; }

  .result-stats-row { grid-template-columns: repeat(2, 1fr); }
  .review-answers { grid-template-columns: 1fr; }
  .review-header { flex-direction: column; }
  .review-filter { margin-left: 0; }

  .history-charts-row { grid-template-columns: 1fr; }
  .topics-row { grid-template-columns: 1fr; }
  .history-header { flex-direction: column; }

  .section { padding: 60px 0; }
  .daily-challenge-card { padding: 28px 20px; }
}

@media (max-width: 480px) {
  .categories-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { flex-direction: column; gap: 16px; }
  .stat-divider { display: none; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn-primary, .hero-actions .btn-ghost { justify-content: center; }
  .result-actions { flex-direction: column; }
  .result-actions button { width: 100%; justify-content: center; }
}

/* ============================================================
   LIGHT THEME OVERRIDES
============================================================ */
[data-theme="light"] .navbar { border-bottom-color: rgba(0,0,0,0.08); }
[data-theme="light"] .hero { background: linear-gradient(180deg, #EFF6FF 0%, #F1F5F9 100%); }
[data-theme="light"] .hero-glow-1 { background: radial-gradient(circle, rgba(59,130,246,0.12) 0%, transparent 70%); }
[data-theme="light"] .floating-code { background: rgba(255,255,255,0.9); border-color: rgba(0,0,0,0.1); }
[data-theme="light"] .categories-section { background: #E2E8F0; }
[data-theme="light"] .daily-section { background: #E2E8F0; }
[data-theme="light"] .footer { background: #E2E8F0; }
[data-theme="light"] .quiz-topbar { background: rgba(241,245,249,0.95); }
[data-theme="light"] .daily-code-preview { background: #1e293b; }
[data-theme="light"] .question-code { background: #1e293b; }
[data-theme="light"] .loading-overlay { background: #F1F5F9; }