/* ============================================================
   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; }