/* ===== QUIZ APP — Neon Arcade Theme ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box
}

:root {
    --bg: #0f0e17;
    --bg2: #1a1a2e;
    --bg3: #16213e;
    --surface: rgba(255, 255, 255, .04);
    --surface2: rgba(255, 255, 255, .07);
    --surface3: rgba(255, 255, 255, .12);
    --border: rgba(255, 255, 255, .08);
    --border2: rgba(255, 255, 255, .15);
    --violet: #a855f7;
    --violet-dim: rgba(168, 85, 247, .15);
    --violet-glow: rgba(168, 85, 247, .4);
    --cyan: #06b6d4;
    --cyan-dim: rgba(6, 182, 212, .15);
    --cyan-glow: rgba(6, 182, 212, .4);
    --magenta: #ec4899;
    --magenta-dim: rgba(236, 72, 153, .15);
    --green: #22c55e;
    --green-dim: rgba(34, 197, 94, .15);
    --red: #ef4444;
    --red-dim: rgba(239, 68, 68, .15);
    --amber: #f59e0b;
    --amber-dim: rgba(245, 158, 11, .15);
    --text: #f0f0ff;
    --text2: #a0a0c0;
    --text3: #6b6b8a;
    --r: 12px;
    --r-lg: 20px;
    --r-xl: 28px;
    --r-full: 9999px;
    --t: .3s ease;
    --t-fast: .15s ease;
    --glow-v: 0 0 20px var(--violet-glow);
    --glow-c: 0 0 20px var(--cyan-glow);
}

html {
    scroll-behavior: smooth
}

body {
    font-family: 'Space Grotesk', 'Inter', system-ui, sans-serif;
    background: var(--bg);
    min-height: 100vh;
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    position: relative;
    overflow-x: hidden;
}

/* Animated mesh gradient background */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(600px circle at 20% 30%, var(--violet-dim), transparent 50%),
        radial-gradient(500px circle at 80% 70%, var(--cyan-dim), transparent 50%),
        radial-gradient(400px circle at 60% 20%, var(--magenta-dim), transparent 50%);
    animation: meshPulse 15s ease-in-out infinite alternate;
}

@keyframes meshPulse {
    0% {
        opacity: .6
    }

    50% {
        opacity: 1
    }

    100% {
        opacity: .7
    }
}

/* Grid lines overlay */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    background-image:
        linear-gradient(var(--border) 1px, transparent 1px),
        linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: .3;
}

/* ===== CONTAINER ===== */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem 1.25rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column
}

/* ===== HEADER ===== */
.header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0
}

.header-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, var(--violet), var(--cyan));
    border-radius: var(--r-lg);
    margin-bottom: 1.25rem;
    box-shadow: var(--glow-v);
    animation: iconFloat 3s ease-in-out infinite;
}

@keyframes iconFloat {

    0%,
    100% {
        transform: translateY(0)
    }

    50% {
        transform: translateY(-6px)
    }
}

.header-icon svg {
    color: white
}

.title {
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 800;
    background: linear-gradient(135deg, var(--violet), var(--cyan), var(--magenta));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: .5rem;
    letter-spacing: -.03em;
}

.subtitle {
    font-size: clamp(1rem, 2.5vw, 1.15rem);
    color: var(--text2);
    max-width: 650px;
    margin: 0 auto;
    font-weight: 400;
    line-height: 1.6;
}

/* ===== SCREEN MANAGEMENT ===== */
.screen {
    display: none;
    flex: 1
}

.screen.active {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center
}

/* ===== CARD ===== */
.card {
    background: var(--surface2);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--r-xl);
    box-shadow: 0 8px 32px rgba(0, 0, 0, .3);
    padding: 2.5rem;
    max-width: 1000px;
    width: 100%;
    margin: 0 auto;
    border: 1px solid var(--border2);
    position: relative;
    overflow: hidden;
    animation: slideInUp .7s cubic-bezier(.16, 1, .3, 1);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--violet), var(--cyan), var(--magenta));
}

.card h2 {
    font-size: clamp(1.5rem, 3.5vw, 2rem);
    font-weight: 700;
    color: var(--text);
    text-align: center;
    margin-bottom: .5rem;
    letter-spacing: -.01em;
}

.card-subtitle {
    text-align: center;
    color: var(--text2);
    font-size: 1rem;
    margin-bottom: 2.5rem;
    font-weight: 400;
}

/* Section Icons */
.section-icon {
    color: var(--violet);
    margin-right: .5rem;
    vertical-align: middle
}

/* ===== SETUP SCREEN ===== */
.setup-content {
    display: flex;
    flex-direction: column;
    gap: 2.5rem
}

.setup-section {
    position: relative
}

.setup-section h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
}

.difficulty-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem
}

.difficulty-btn {
    padding: 1.5rem 1rem;
    border: 2px solid var(--border2);
    border-radius: var(--r-lg);
    background: var(--surface);
    cursor: pointer;
    transition: all var(--t);
    text-align: center;
    position: relative;
    overflow: hidden;
    color: var(--text);
    font-family: inherit;
}

.difficulty-btn:hover {
    border-color: var(--violet);
    background: var(--violet-dim);
    transform: translateY(-3px);
    box-shadow: var(--glow-v);
}

.difficulty-btn.active {
    border-color: var(--violet);
    background: var(--violet-dim);
    box-shadow: var(--glow-v);
}

.difficulty-icon {
    width: 44px;
    height: 44px;
    margin: 0 auto .5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--r-full);
    transition: all var(--t);
}

.difficulty-icon.easy {
    background: var(--green-dim);
    color: var(--green)
}

.difficulty-icon.medium {
    background: var(--amber-dim);
    color: var(--amber)
}

.difficulty-icon.hard {
    background: var(--red-dim);
    color: var(--red)
}

.difficulty-icon.mixed {
    background: var(--cyan-dim);
    color: var(--cyan)
}

.difficulty-btn.active .difficulty-icon {
    background: var(--violet-dim);
    color: var(--violet)
}

.difficulty-label {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: .15rem;
    display: block;
    color: var(--text)
}

.difficulty-desc {
    font-size: .8rem;
    color: var(--text3);
    font-weight: 400
}

/* Category */
.category-select {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border2);
    border-radius: var(--r);
    font-size: 1rem;
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    transition: all var(--t);
    font-weight: 500;
    font-family: inherit;
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%23a855f7' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 1rem center;
    background-repeat: no-repeat;
    background-size: 1.5em;
    padding-right: 3rem;
}

.category-select:focus {
    outline: none;
    border-color: var(--violet);
    box-shadow: 0 0 0 3px var(--violet-dim)
}

.category-select option {
    background: var(--bg2);
    color: var(--text)
}

/* Question Count */
.question-count-container {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: .5rem
}

.question-slider {
    flex: 1;
    height: 6px;
    background: var(--surface3);
    border-radius: var(--r-full);
    outline: none;
    cursor: pointer;
    appearance: none;
}

.question-slider::-webkit-slider-thumb {
    appearance: none;
    width: 22px;
    height: 22px;
    background: linear-gradient(135deg, var(--violet), var(--cyan));
    border-radius: var(--r-full);
    cursor: pointer;
    border: 3px solid var(--bg);
    box-shadow: var(--glow-v);
    transition: all var(--t);
}

.question-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15)
}

.question-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    background: linear-gradient(135deg, var(--violet), var(--cyan));
    border-radius: var(--r-full);
    cursor: pointer;
    border: 3px solid var(--bg);
}

.question-count-display {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--violet);
    min-width: 3.5rem;
    text-align: center;
    background: var(--violet-dim);
    padding: .35rem .75rem;
    border-radius: var(--r);
}

.question-count-labels {
    display: flex;
    justify-content: space-between;
    font-size: .8rem;
    color: var(--text3)
}

/* Error */
.error-message {
    background: var(--red-dim);
    border: 1px solid rgba(239, 68, 68, .25);
    color: var(--red);
    padding: 1rem;
    border-radius: var(--r);
    text-align: center;
    font-weight: 500;
}

.error-message.hidden {
    display: none
}

/* ===== BUTTONS ===== */
.start-btn {
    background: linear-gradient(135deg, var(--violet), var(--cyan));
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--r);
    font-size: 1.05rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--t);
    box-shadow: var(--glow-v);
    min-width: 220px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

.start-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .15), transparent);
    transform: translateX(-100%);
    transition: transform .5s;
}

.start-btn:hover::before {
    transform: translateX(100%)
}

.start-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 30px var(--violet-glow)
}

.start-btn:active {
    transform: translateY(-1px)
}

.start-btn:disabled {
    opacity: .5;
    cursor: not-allowed;
    transform: none
}

.btn-icon {
    flex-shrink: 0
}

.start-button-container {
    text-align: center;
    margin-top: 1.5rem
}

/* Spinner */
.loading-spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid transparent;
    border-top: 2px solid white;
    border-radius: var(--r-full);
    animation: spin 1s linear infinite;
}

.loading-spinner.hidden {
    display: none
}

/* ===== GAME SCREEN ===== */
.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem
}

.game-info {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    flex-wrap: wrap
}

.difficulty-badge {
    padding: .4rem .85rem;
    border-radius: var(--r-full);
    font-size: .8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--violet), var(--magenta));
    color: white;
    text-transform: uppercase;
    letter-spacing: .06em;
    box-shadow: var(--glow-v);
}

.question-counter {
    color: var(--text2);
    font-size: .95rem;
    font-weight: 500
}

.timer-container {
    display: flex;
    align-items: center;
    gap: .4rem;
    background: var(--surface2);
    padding: .4rem .85rem;
    border-radius: var(--r-full);
    border: 1px solid var(--border);
}

.timer-icon {
    color: var(--cyan)
}

.timer {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--cyan);
    min-width: 2.25rem;
    text-align: center
}

.timer.warning {
    color: var(--red);
    animation: pulse 1s infinite
}

/* Progress */
.progress-container {
    width: 100%;
    background: var(--surface3);
    border-radius: var(--r-full);
    height: 8px;
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--violet), var(--cyan));
    border-radius: var(--r-full);
    transition: width var(--t);
    width: 0%;
    position: relative;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .25), transparent);
    animation: shimmer 2s infinite;
}

/* Score */
.score-display {
    text-align: center;
    margin-bottom: 1.5rem;
    background: var(--surface);
    padding: 1rem;
    border-radius: var(--r);
    border: 1px solid var(--border);
}

.score-label {
    color: var(--text2);
    font-weight: 600;
    margin-right: .4rem;
    font-size: 1rem
}

.score-value {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--violet)
}

/* Question */
.question-container {
    text-align: center;
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: var(--surface);
    border-radius: var(--r-lg);
    border: 1px solid var(--border);
}

.question-text {
    font-size: clamp(1.05rem, 2.5vw, 1.35rem);
    font-weight: 600;
    color: var(--text);
    line-height: 1.6
}

/* Answers */
.answers-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem
}

.answer-btn {
    padding: 1.25rem;
    border: 2px solid var(--border2);
    border-radius: var(--r);
    background: var(--surface);
    cursor: pointer;
    transition: all var(--t);
    text-align: left;
    display: flex;
    align-items: center;
    gap: 1rem;
    position: relative;
    overflow: hidden;
    color: var(--text);
    font-family: inherit;
}

.answer-btn:hover {
    border-color: var(--violet);
    background: var(--violet-dim);
    transform: translateY(-2px);
    box-shadow: var(--glow-v);
}

.answer-btn.selected {
    border-color: var(--violet);
    background: var(--violet-dim);
    box-shadow: var(--glow-v)
}

.answer-btn.correct {
    border-color: var(--green);
    background: var(--green-dim);
    color: var(--green);
    box-shadow: 0 0 20px rgba(34, 197, 94, .3)
}

.answer-btn.incorrect {
    border-color: var(--red);
    background: var(--red-dim);
    color: var(--red);
    box-shadow: 0 0 20px rgba(239, 68, 68, .3)
}

.answer-btn.disabled {
    border-color: var(--border);
    background: var(--surface);
    color: var(--text3);
    cursor: not-allowed;
    opacity: .5
}

.answer-letter {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: var(--r-full);
    background: var(--violet);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
}

.answer-btn.correct .answer-letter {
    background: var(--green)
}

.answer-btn.incorrect .answer-letter {
    background: var(--red)
}

.answer-text {
    font-weight: 500;
    flex: 1;
    font-size: .95rem;
    line-height: 1.4
}

/* Result */
.answer-result {
    text-align: center;
    margin-top: 1.5rem
}

.result-content {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: 1rem 1.5rem;
    border-radius: var(--r);
    font-weight: 700;
    font-size: 1rem;
}

.result-content.correct {
    background: var(--green-dim);
    color: var(--green);
    border: 1px solid rgba(34, 197, 94, .25)
}

.result-content.incorrect {
    background: var(--red-dim);
    color: var(--red);
    border: 1px solid rgba(239, 68, 68, .25)
}

/* ===== RESULTS SCREEN ===== */
.results-header {
    text-align: center;
    margin-bottom: 2.5rem
}

.performance-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--violet), var(--cyan));
    border-radius: var(--r-full);
    color: white;
    box-shadow: var(--glow-v);
    animation: bounce 2s infinite;
}

.performance-message {
    font-size: clamp(1.5rem, 3.5vw, 2rem);
    font-weight: 800;
    margin-bottom: .35rem;
    background: linear-gradient(135deg, var(--violet), var(--cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.results-subtitle {
    font-size: 1.1rem;
    color: var(--text2);
    font-weight: 400
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem
}

.stat-card {
    background: var(--surface2);
    padding: 1.75rem;
    border-radius: var(--r-lg);
    text-align: center;
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border);
    transition: all var(--t);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--glow-v)
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--violet), var(--cyan))
}

.stat-card:nth-child(2)::before {
    background: linear-gradient(90deg, var(--cyan), var(--magenta))
}

.stat-card:nth-child(3)::before {
    background: linear-gradient(90deg, var(--green), var(--cyan))
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: .35rem;
    color: var(--violet)
}

.stat-card:nth-child(2) .stat-value {
    color: var(--cyan)
}

.stat-card:nth-child(3) .stat-value {
    color: var(--green)
}

.stat-label {
    font-weight: 600;
    color: var(--text);
    margin-bottom: .15rem;
    font-size: 1rem
}

.stat-sublabel {
    font-size: .8rem;
    color: var(--text3);
    font-weight: 400
}

/* Difficulty Breakdown */
.difficulty-breakdown {
    margin-bottom: 2.5rem
}

.difficulty-breakdown h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center
}

.difficulty-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem
}

.difficulty-stat {
    background: var(--surface);
    padding: 1.25rem;
    border-radius: var(--r);
    text-align: center;
    border: 1px solid var(--border);
    transition: all var(--t);
}

.difficulty-stat:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow-v)
}

.difficulty-stat-icon {
    width: 40px;
    height: 40px;
    margin: 0 auto .5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--r-full);
    background: var(--violet-dim);
    color: var(--violet);
}

.difficulty-stat-label {
    font-weight: 600;
    color: var(--text);
    margin-bottom: .15rem;
    font-size: .95rem
}

.difficulty-stat-count {
    font-size: .8rem;
    color: var(--text3);
    font-weight: 400
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap
}

.action-btn {
    padding: 1rem 1.5rem;
    border: none;
    border-radius: var(--r);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--t);
    min-width: 180px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    font-family: inherit;
}

.action-btn.primary {
    background: linear-gradient(135deg, var(--violet), var(--cyan));
    color: white;
    box-shadow: var(--glow-v);
}

.action-btn.secondary {
    background: var(--surface2);
    color: var(--text);
    border: 2px solid var(--border2);
}

.action-btn:hover {
    transform: translateY(-3px)
}

.action-btn.primary:hover {
    box-shadow: 0 0 30px var(--violet-glow)
}

.action-btn.secondary:hover {
    border-color: var(--cyan);
    color: var(--cyan)
}

/* ===== LEADERBOARD ===== */
.leaderboard-header {
    text-align: center;
    margin-bottom: 2.5rem
}

.leaderboard-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--amber), var(--magenta));
    border-radius: var(--r-full);
    color: white;
    box-shadow: 0 0 20px rgba(245, 158, 11, .4);
    animation: bounce 2s infinite;
}

.leaderboard-title {
    font-size: clamp(1.5rem, 3.5vw, 2rem);
    font-weight: 800;
    color: var(--text);
    margin-bottom: .35rem;
}

.leaderboard-subtitle {
    font-size: 1.05rem;
    color: var(--text2);
    font-weight: 400
}

.leaderboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem
}

.leaderboard-stat {
    background: var(--surface2);
    padding: 1.75rem;
    border-radius: var(--r-lg);
    text-align: center;
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border);
    transition: all var(--t);
}

.leaderboard-stat:hover {
    transform: translateY(-4px);
    box-shadow: var(--glow-v)
}

.leaderboard-stat::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--amber), var(--magenta))
}

.leaderboard-stat:nth-child(2)::before {
    background: linear-gradient(90deg, var(--violet), var(--cyan))
}

.leaderboard-stat:nth-child(3)::before {
    background: linear-gradient(90deg, var(--green), var(--cyan))
}

.leaderboard-stat-value {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: .35rem;
    color: var(--amber)
}

.leaderboard-stat:nth-child(2) .leaderboard-stat-value {
    color: var(--violet)
}

.leaderboard-stat:nth-child(3) .leaderboard-stat-value {
    color: var(--green)
}

.leaderboard-stat-label {
    font-weight: 600;
    color: var(--text);
    margin-bottom: .15rem;
    font-size: 1rem
}

.leaderboard-stat-sublabel {
    font-size: .8rem;
    color: var(--text3);
    font-weight: 400
}

.leaderboard-list {
    margin-bottom: 2.5rem
}

.leaderboard-entry {
    padding: 1.25rem;
    border-radius: var(--r);
    margin-bottom: .75rem;
    transition: all var(--t);
    border: 2px solid transparent;
    background: var(--surface);
}

.leaderboard-entry.top-3 {
    border-color: var(--amber);
    background: var(--amber-dim);
    box-shadow: 0 0 15px rgba(245, 158, 11, .2)
}

.leaderboard-entry:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow-v)
}

.leaderboard-entry-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem
}

.leaderboard-entry-left {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    flex: 1;
    min-width: 280px
}

.leaderboard-rank {
    font-size: 1.5rem;
    font-weight: 800;
    min-width: 2.5rem;
    text-align: center;
    color: var(--violet)
}

.leaderboard-entry.top-3 .leaderboard-rank {
    color: var(--amber)
}

.leaderboard-entry-info {
    flex: 1
}

.leaderboard-name {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: .35rem;
    display: flex;
    align-items: center;
    gap: .4rem;
    flex-wrap: wrap
}

.leaderboard-details {
    display: flex;
    gap: 1.25rem;
    font-size: .8rem;
    color: var(--text3);
    flex-wrap: wrap
}

.leaderboard-detail {
    display: flex;
    align-items: center;
    gap: .2rem;
    font-weight: 500
}

.leaderboard-entry-right {
    text-align: right
}

.leaderboard-score {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--violet)
}

.leaderboard-score-label {
    font-size: .8rem;
    color: var(--text3);
    font-weight: 400
}

.difficulty-tag {
    padding: .2rem .5rem;
    border-radius: var(--r-full);
    font-size: .7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .05em;
}

.difficulty-tag.easy {
    background: var(--green-dim);
    color: var(--green)
}

.difficulty-tag.medium {
    background: var(--amber-dim);
    color: var(--amber)
}

.difficulty-tag.hard {
    background: var(--red-dim);
    color: var(--red)
}

.empty-leaderboard {
    text-align: center;
    padding: 3rem;
    background: var(--surface);
    border-radius: var(--r-lg);
    border: 1px solid var(--border)
}

.empty-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface3);
    border-radius: var(--r-full);
    color: var(--text3);
}

.empty-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text2);
    margin-bottom: .35rem
}

.empty-subtitle {
    color: var(--text3);
    font-weight: 400
}

.back-button-container {
    text-align: center
}

.back-btn {
    background: linear-gradient(135deg, var(--violet), var(--cyan));
    color: white;
    border: none;
    padding: 1rem 1.5rem;
    border-radius: var(--r);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--t);
    box-shadow: var(--glow-v);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    font-family: inherit;
}

.back-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--violet-glow)
}

/* ===== UTILITY ===== */
.hidden {
    display: none !important
}

/* ===== ANIMATIONS ===== */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(40px)
    }

    to {
        opacity: 1;
        transform: translateY(0)
    }
}

@keyframes spin {
    from {
        transform: rotate(0deg)
    }

    to {
        transform: rotate(360deg)
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1
    }

    50% {
        opacity: .5
    }
}

@keyframes bounce {

    0%,
    20%,
    53%,
    80%,
    100% {
        transform: translate3d(0, 0, 0)
    }

    40%,
    43% {
        transform: translate3d(0, -20px, 0)
    }

    70% {
        transform: translate3d(0, -10px, 0)
    }

    90% {
        transform: translate3d(0, -3px, 0)
    }
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%)
    }

    100% {
        transform: translateX(100%)
    }
}

/* ===== RESPONSIVE ===== */
@media(max-width:1200px) {
    .container {
        padding: 1.5rem 1rem
    }

    .card {
        padding: 2rem
    }
}

@media(max-width:768px) {
    .container {
        padding: 1rem .75rem
    }

    .header {
        margin-bottom: 2rem;
        padding: 1.25rem 0
    }

    .card {
        padding: 1.5rem;
        margin: 0 .25rem
    }

    .card h2 {
        font-size: 1.35rem
    }

    .difficulty-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: .75rem
    }

    .game-header {
        flex-direction: column;
        gap: .75rem;
        align-items: stretch
    }

    .game-info {
        justify-content: space-between
    }

    .answers-container {
        grid-template-columns: 1fr;
        gap: .75rem
    }

    .stats-grid,
    .leaderboard-stats {
        grid-template-columns: 1fr;
        gap: 1rem
    }

    .action-buttons {
        flex-direction: column
    }

    .action-btn {
        min-width: auto
    }

    .leaderboard-entry-content {
        flex-direction: column;
        text-align: center
    }

    .leaderboard-entry-left {
        flex-direction: column;
        text-align: center;
        min-width: auto
    }

    .leaderboard-details {
        justify-content: center
    }

    .leaderboard-entry-right {
        text-align: center
    }
}

@media(max-width:480px) {
    .container {
        padding: .75rem
    }

    .card {
        padding: 1.25rem;
        margin: 0
    }

    .difficulty-grid {
        grid-template-columns: 1fr
    }

    .question-text {
        font-size: 1rem
    }

    .performance-message {
        font-size: 1.25rem
    }

    .leaderboard-title {
        font-size: 1.25rem
    }

    .timer {
        font-size: 1.25rem
    }

    .score-value,
    .stat-value,
    .leaderboard-stat-value {
        font-size: 1.5rem
    }

    .leaderboard-score {
        font-size: 1.25rem
    }
}

@media(prefers-reduced-motion:reduce) {

    *,
    *::before,
    *::after {
        animation-duration: .01ms !important;
        transition-duration: .01ms !important
    }
}