/* ==========================================
   QuickFire Trivia - VIP Edition Styles
   Sophisticated Dark Theme with Premium Accents
   ========================================== */

/* CSS Variables */
:root {
    --primary-dark: #0a0e27;
    --secondary-dark: #151933;
    --accent-gold: #d4af37;
    --accent-silver: #c0c0c0;
    --accent-blue: #4a90e2;
    --text-primary: #ffffff;
    --text-secondary: #b0b8c8;
    --text-muted: #6c7a8c;
    --success: #2ecc71;
    --error: #e74c3c;
    --warning: #f39c12;
    --card-bg: rgba(21, 25, 51, 0.8);
    --card-border: rgba(212, 175, 55, 0.2);
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--primary-dark);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* Background Effects */
.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at top, rgba(74, 144, 226, 0.1), transparent),
                radial-gradient(ellipse at bottom, rgba(212, 175, 55, 0.05), transparent);
    pointer-events: none;
    z-index: 0;
}

.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}

/* Main Container */
.game-container {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    z-index: 1;
}

/* Screen Management */
.screen {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==========================================
   WELCOME SCREEN
   ========================================== */

.logo-section {
    text-align: center;
    margin: 3rem 0 4rem;
}

.game-title {
    font-size: 4rem;
    font-weight: 700;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-silver), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    text-shadow: 0 0 30px rgba(212, 175, 55, 0.3);
}

.title-accent {
    display: inline-block;
    margin-left: 0.5rem;
}

.tagline {
    font-size: 1.2rem;
    color: var(--text-secondary);
    letter-spacing: 3px;
    text-transform: uppercase;
    font-weight: 300;
}

/* Mode Selection */
.mode-selection {
    max-width: 1000px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--accent-gold);
    font-weight: 300;
    letter-spacing: 1px;
}

.mode-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.mode-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 2rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.mode-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.1), transparent);
    transition: left 0.5s;
}

.mode-card:hover::before {
    left: 100%;
}

.mode-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-gold);
    box-shadow: 0 10px 40px rgba(212, 175, 55, 0.2);
}

.mode-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    filter: grayscale(0.3);
}

.mode-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.mode-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.mode-time {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(74, 144, 226, 0.2);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--accent-blue);
}

/* Stats Preview */
.stats-preview {
    display: flex;
    justify-content: center;
    gap: 3rem;
    padding: 2rem;
    background: rgba(10, 14, 39, 0.5);
    border-radius: 16px;
    border: 1px solid rgba(74, 144, 226, 0.2);
}

.stat-item {
    text-align: center;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Back To Home Button */
.back-home-container {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(74, 144, 226, 0.2);
}

.btn-back-home {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: rgba(21, 25, 51, 0.6);
    border: 2px solid var(--accent-gold);
    border-radius: 8px;
    color: var(--accent-gold);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.1);
}

.btn-back-home:hover {
    background: var(--accent-gold);
    color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(212, 175, 55, 0.3);
    border-color: var(--accent-gold);
}

.btn-back-home:active {
    transform: translateY(-1px);
}

/* ==========================================
   CATEGORY SCREEN
   ========================================== */

.screen-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.screen-header h2 {
    font-size: 2rem;
    color: var(--accent-gold);
    font-weight: 300;
}

.btn-back {
    background: rgba(21, 25, 51, 0.8);
    border: 1px solid var(--card-border);
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition-smooth);
}

.btn-back:hover {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    transform: translateX(-5px);
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.category-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 2.5rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.category-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-blue);
    box-shadow: 0 10px 40px rgba(74, 144, 226, 0.2);
}

.category-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.category-card h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
}

/* ==========================================
   GAME SCREEN
   ========================================== */

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--card-border);
    margin-bottom: 1.5rem;
}

.game-info {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.info-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.25rem;
}

.info-value {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
}

.score-display {
    color: var(--accent-gold);
    font-size: 1.5rem;
}

/* Timer and Streak */
.game-stats {
    display: flex;
    gap: 2rem;
    align-items: center;
    margin-bottom: 2rem;
}

.timer-container {
    flex: 1;
    position: relative;
    height: 60px;
    background: rgba(10, 14, 39, 0.5);
    border-radius: 30px;
    border: 1px solid var(--card-border);
    overflow: hidden;
}

.timer-bar {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-gold));
    transition: width 0.1s linear;
    border-radius: 30px;
}

.timer-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    z-index: 1;
}

.streak-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    background: rgba(46, 204, 113, 0.1);
    border-radius: 30px;
    border: 1px solid rgba(46, 204, 113, 0.3);
}

.streak-icon {
    font-size: 1.5rem;
}

.streak-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--success);
}

/* Question Card */
.question-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 3rem 2rem;
    margin-bottom: 2rem;
    position: relative;
}

.category-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-gold));
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.question-text {
    font-size: 1.8rem;
    line-height: 1.6;
    font-weight: 400;
    text-align: center;
    color: var(--text-primary);
}

/* Answer Options */
.answers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.answer-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--card-bg);
    border: 2px solid var(--card-border);
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition-smooth);
    text-align: left;
    font-size: 1rem;
}

.answer-btn:hover:not(.correct):not(.incorrect):not(:disabled) {
    border-color: var(--accent-blue);
    transform: translateX(8px);
    box-shadow: 0 5px 20px rgba(74, 144, 226, 0.2);
}

.answer-letter {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-blue));
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.answer-text {
    flex: 1;
    color: var(--text-primary);
}

.answer-btn.correct {
    border-color: var(--success);
    background: rgba(46, 204, 113, 0.1);
    animation: correctPulse 0.6s ease-in-out;
}

.answer-btn.incorrect {
    border-color: var(--error);
    background: rgba(231, 76, 60, 0.1);
    animation: incorrectShake 0.5s ease-in-out;
}

.answer-btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

@keyframes correctPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes incorrectShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

/* Explanation Panel */
.explanation-panel {
    display: none;
    padding: 1.5rem;
    background: rgba(74, 144, 226, 0.1);
    border: 1px solid rgba(74, 144, 226, 0.3);
    border-radius: 12px;
    margin-bottom: 2rem;
}

.explanation-panel.show {
    display: block;
    animation: slideDown 0.4s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.explanation-text {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.6;
}

/* ==========================================
   RESULTS SCREEN
   ========================================== */

.results-container {
    max-width: 700px;
    margin: 3rem auto;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 3rem;
    text-align: center;
}

.results-header {
    margin-bottom: 2rem;
}

.results-title {
    font-size: 2.5rem;
    color: var(--accent-gold);
    font-weight: 300;
    margin-bottom: 1rem;
}

.results-badge {
    font-size: 4rem;
    animation: bounceIn 0.8s ease-out;
}

@keyframes bounceIn {
    0% { transform: scale(0); opacity: 0; }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); opacity: 1; }
}

.final-score {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 2rem 0;
    padding: 2rem;
    background: rgba(10, 14, 39, 0.5);
    border-radius: 16px;
}

.score-label {
    font-size: 1rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
}

.score-value {
    font-size: 4rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin: 2rem 0;
}

.result-stat {
    padding: 1.5rem;
    background: rgba(10, 14, 39, 0.3);
    border-radius: 12px;
    border: 1px solid rgba(74, 144, 226, 0.2);
}

.result-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.result-value {
    display: block;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-blue);
}

.high-score-notification {
    display: none;
    padding: 1rem;
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-blue));
    border-radius: 12px;
    font-size: 1.2rem;
    font-weight: 600;
    margin: 2rem 0;
    animation: pulse 2s infinite;
}

.high-score-notification.show {
    display: block;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

/* Results Actions */
.results-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.btn-primary,
.btn-secondary {
    flex: 1;
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-blue));
    color: var(--primary-dark);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(212, 175, 55, 0.4);
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--accent-blue);
    color: var(--accent-blue);
}

.btn-secondary:hover {
    background: var(--accent-blue);
    color: var(--primary-dark);
    transform: translateY(-3px);
}

/* ==========================================
   LOADING OVERLAY
   ========================================== */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 14, 39, 0.95);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 1rem;
    z-index: 1000;
}

.loading-overlay.show {
    display: flex;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(212, 175, 55, 0.2);
    border-top: 4px solid var(--accent-gold);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-overlay p {
    color: var(--text-secondary);
    font-size: 1.2rem;
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */

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

    .game-title {
        font-size: 2.5rem;
    }

    .tagline {
        font-size: 0.9rem;
    }

    .mode-cards {
        grid-template-columns: 1fr;
    }

    .stats-preview {
        flex-direction: column;
        gap: 1.5rem;
    }

    .game-header {
        flex-direction: column;
        gap: 1rem;
    }

    .game-stats {
        flex-direction: column;
    }

    .answers-grid {
        grid-template-columns: 1fr;
    }

    .results-stats {
        grid-template-columns: 1fr;
    }

    .results-actions {
        flex-direction: column;
    }

    .question-text {
        font-size: 1.3rem;
    }
}

@media (max-width: 480px) {
    .game-title {
        font-size: 2rem;
    }

    .question-text {
        font-size: 1.1rem;
    }

    .answer-btn {
        padding: 1rem;
    }
}