/* ===========================
   CSS Variables & Base Tokens
   =========================== */
:root {
    /* Color palette */
    --neon-green: #39ff14;
    --void-black: #0d0d0d;
    --amber: #ffb000;
    --alert-red: #ff0055;
    --neon-blue: #00d9ff;

    /* RGB helpers for rgba() usage */
    --accent-rgb: 57, 255, 20;
    --danger-rgb: 255, 0, 85;

    /* Button shape tokens */
    --btn-radius: 0px;
    --btn-border-style: solid;
    --btn-border-width: 2px;
    --btn-shadow: 0 0 10px var(--neon-green);
    --btn-shadow-hover: 0 0 20px var(--neon-green), 0 0 40px var(--neon-green);
    --btn-hover-transform: scale(1.05);

    /* Animation tokens */
    --transition-speed: 0.3s;
    --screen-anim: fadeIn;
    --title-shadow: 0 0 20px var(--neon-green), 0 0 40px var(--neon-green);
    --text-glow: 0 0 5px var(--neon-green);

    /* Background pattern */
    --bg-pattern: none;
    --bg-color: var(--void-black);
}

/* Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'VT323', monospace;
    background: var(--bg-color);
    color: var(--neon-green);
    overflow-x: hidden;
    min-height: 100vh;
}

/* Background pattern layer */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    background: var(--bg-pattern);
    pointer-events: none;
    z-index: 0;
}

/* CRT Scanline Effect */
.crt-overlay {
    pointer-events: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: repeating-linear-gradient(
        0deg,
        rgba(0, 0, 0, 0.15),
        rgba(0, 0, 0, 0.15) 1px,
        transparent 1px,
        transparent 2px
    );
    z-index: 9999;
}

/* Screen Management */
.screen {
    display: none;
    min-height: 100vh;
    padding: 20px;
    position: relative;
    z-index: 1;
    animation: var(--screen-anim) var(--transition-speed) ease-in;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Additional screen transition keyframes */
@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.9);
    }
    60% {
        opacity: 1;
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes fadeFromDark {
    from {
        opacity: 0;
        filter: brightness(0);
    }
    to {
        opacity: 1;
        filter: brightness(1);
    }
}

.container {
    width: 100%;
    max-width: 800px;
    text-align: center;
}

/* Typography */
.title {
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(2rem, 8vw, 4rem);
    text-shadow: var(--title-shadow);
    margin-bottom: 20px;
    line-height: 1.3;
}

.subtitle {
    font-size: clamp(1rem, 3vw, 1.5rem);
    color: var(--amber);
    margin-bottom: 40px;
    letter-spacing: 2px;
}

.screen-title {
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(1.5rem, 5vw, 2.5rem);
    margin-bottom: 30px;
    text-shadow: 0 0 10px var(--neon-green);
}

/* Stats Bar */
.stats-bar {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 40px;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--amber);
}

.stat-value {
    font-size: 2rem;
    font-family: 'Press Start 2P', monospace;
    text-shadow: 0 0 10px var(--neon-green);
}

/* Buttons */
.menu-btn, .start-btn, .back-btn, .toggle-btn, .danger-btn {
    font-family: 'Press Start 2P', monospace;
    background: transparent;
    color: var(--neon-green);
    border: var(--btn-border-width) var(--btn-border-style) var(--neon-green);
    border-radius: var(--btn-radius);
    padding: 15px 30px;
    font-size: clamp(0.8rem, 2.5vw, 1rem);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    text-shadow: var(--text-glow);
    box-shadow: var(--btn-shadow);
    margin: 10px;
    min-width: 200px;
}

.menu-btn:hover, .start-btn:hover, .back-btn:hover, .toggle-btn:hover {
    background: var(--neon-green);
    color: var(--void-black);
    box-shadow: var(--btn-shadow-hover);
    transform: var(--btn-hover-transform);
}

.danger-btn {
    border-color: var(--alert-red);
    color: var(--alert-red);
    text-shadow: 0 0 5px var(--alert-red);
    box-shadow: 0 0 10px var(--alert-red);
}

.danger-btn:hover {
    background: var(--alert-red);
    color: var(--void-black);
    box-shadow: 0 0 20px var(--alert-red);
}

.back-btn {
    position: absolute;
    top: 20px;
    left: 20px;
    min-width: auto;
    padding: 10px 20px;
    font-size: 0.8rem;
}

nav.menu {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 30px 0;
}

/* Game Header */
.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    padding: 20px;
    padding-left: 180px; /* Make room for back button */
    position: relative;
}

.timer, .score, .lives, .progress {
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(1.2rem, 4vw, 2rem);
    text-shadow: 0 0 10px var(--neon-green);
}

.timer {
    color: var(--amber);
}

/* Game Area */
.game-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
    margin: 40px 0;
}

.equation {
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(2rem, 8vw, 4rem);
    text-shadow: var(--title-shadow);
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.answer-input {
    font-family: 'VT323', monospace;
    font-size: clamp(2rem, 6vw, 3rem);
    background: rgba(var(--accent-rgb), 0.1);
    border: 3px solid var(--neon-green);
    border-radius: var(--btn-radius);
    color: var(--neon-green);
    text-align: center;
    padding: 20px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 0 20px var(--neon-green);
    outline: none;
}

.answer-input:focus {
    box-shadow: 0 0 30px var(--neon-green), 0 0 60px var(--neon-green);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% {
        border-color: var(--neon-green);
    }
    50% {
        border-color: var(--amber);
    }
}

.feedback {
    font-size: 1.5rem;
    min-height: 40px;
    font-weight: bold;
}

/* Animations */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

@keyframes flash-green {
    0%, 100% { background: var(--void-black); }
    50% { background: rgba(var(--accent-rgb), 0.2); }
}

@keyframes flash-red {
    0%, 100% { background: var(--void-black); }
    50% { background: rgba(var(--danger-rgb), 0.2); }
}

.shake {
    animation: shake 0.3s ease-in-out;
}

.flash-correct {
    animation: flash-green 0.3s ease-in-out;
}

.flash-wrong {
    animation: flash-red 0.3s ease-in-out;
}

/* Canvas */
#game-canvas {
    width: 100%;
    max-width: 600px;
    height: 400px;
    border: 2px solid var(--neon-green);
    border-radius: var(--btn-radius);
    background: rgba(0, 0, 0, 0.5);
    margin: 20px auto;
    display: block;
}

/* Custom Drill Config */
.config-section {
    margin: 25px 0;
    text-align: left;
}

.config-label {
    font-family: 'Press Start 2P', monospace;
    font-size: 0.9rem;
    color: var(--amber);
    margin-bottom: 12px;
}

.config-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
}

.config-desc {
    font-size: 1.1rem;
    color: var(--neon-green);
}

.op-toggles {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.op-toggle {
    font-family: 'Press Start 2P', monospace;
    font-size: 1.2rem;
    width: 64px;
    height: 64px;
    background: transparent;
    border: var(--btn-border-width) var(--btn-border-style) var(--neon-green);
    border-radius: var(--btn-radius);
    color: var(--neon-green);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.4;
}

.op-toggle:hover {
    transform: scale(1.1);
    opacity: 0.7;
}

.op-toggle.active {
    background: var(--neon-green);
    color: var(--void-black);
    box-shadow: 0 0 15px var(--neon-green);
    opacity: 1;
}

.toggle-btn.active {
    background: var(--neon-green);
    color: var(--void-black);
    box-shadow: 0 0 15px var(--neon-green);
}

/* Drill Stats Bar */
.drill-stats-bar {
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(0.6rem, 2vw, 0.9rem);
    display: flex;
    gap: 15px;
    align-items: center;
    color: var(--neon-green);
    text-shadow: var(--text-glow);
}

/* Intervention Mode Progress Bar */
.intervention-bar {
    border: 2px var(--btn-border-style) var(--amber);
    border-radius: var(--btn-radius);
    padding: 10px 15px;
    margin-bottom: 15px;
    background: rgba(255, 176, 0, 0.05);
}

.intervention-header {
    font-family: 'Press Start 2P', monospace;
    font-size: 0.65rem;
    color: var(--amber);
    margin-bottom: 8px;
    text-align: center;
}

.intervention-metrics {
    display: flex;
    justify-content: space-between;
    font-family: 'Press Start 2P', monospace;
    font-size: 0.55rem;
    color: var(--neon-green);
    margin-bottom: 8px;
}

.intervention-metrics b {
    color: var(--amber);
}

.intervention-fill-track {
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
}

.intervention-fill {
    height: 100%;
    background: var(--amber);
    border-radius: 3px;
    transition: width 0.3s ease;
    box-shadow: 0 0 8px var(--amber);
}

/* Financial Drill Toggles */
.fin-toggles {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.fin-toggle {
    font-family: 'Press Start 2P', monospace;
    font-size: 0.55rem;
    width: 80px;
    height: 64px;
    background: transparent;
    border: var(--btn-border-width) var(--btn-border-style) var(--neon-green);
    border-radius: var(--btn-radius);
    color: var(--neon-green);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    line-height: 1.4;
    opacity: 0.4;
    padding: 4px;
}

.fin-toggle:hover {
    transform: scale(1.05);
    opacity: 0.7;
}

.fin-toggle.active {
    background: var(--neon-green);
    color: var(--void-black);
    box-shadow: 0 0 15px var(--neon-green);
    opacity: 1;
}

/* Financial equation auto-shrink */
.equation-financial {
    font-size: clamp(0.9rem, 3.5vw, 1.8rem) !important;
    word-break: break-word;
    line-height: 1.4;
    padding: 0 10px;
}

/* Results Screen */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin: 40px 0;
}

.result-item {
    padding: 20px;
    border: var(--btn-border-width) var(--btn-border-style) var(--neon-green);
    border-radius: var(--btn-radius);
    background: rgba(var(--accent-rgb), 0.05);
}

.result-label {
    font-size: 1rem;
    color: var(--amber);
    margin-bottom: 10px;
}

.result-value {
    font-family: 'Press Start 2P', monospace;
    font-size: 1.5rem;
    text-shadow: 0 0 10px var(--neon-green);
}

.high-score-banner {
    font-family: 'Press Start 2P', monospace;
    font-size: 1.5rem;
    color: var(--amber);
    text-shadow: 0 0 20px var(--amber);
    margin: 30px 0;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50%, 100% { opacity: 1; }
    25%, 75% { opacity: 0.5; }
}

/* Settings */
.setting {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border: 1px solid var(--neon-green);
    border-radius: var(--btn-radius);
    margin: 15px 0;
    font-size: 1.2rem;
}

input[type="range"] {
    width: 200px;
    height: 30px;
}

/* Theme Selector */
.theme-selector {
    font-family: 'VT323', monospace;
    font-size: 1.3rem;
    background: rgba(var(--accent-rgb), 0.1);
    border: var(--btn-border-width) var(--btn-border-style) var(--neon-green);
    border-radius: var(--btn-radius);
    color: var(--neon-green);
    padding: 12px 20px;
    cursor: pointer;
    outline: none;
    box-shadow: var(--btn-shadow);
    transition: all var(--transition-speed) ease;
    min-width: 200px;
}

.theme-selector:hover {
    box-shadow: var(--btn-shadow-hover);
}

.theme-selector:focus {
    box-shadow: 0 0 30px var(--neon-green), 0 0 60px var(--neon-green);
}

.theme-selector option {
    background: var(--void-black);
    color: var(--neon-green);
    padding: 10px;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
}

.modal-content {
    background: var(--void-black);
    border: 3px var(--btn-border-style) var(--neon-green);
    border-radius: var(--btn-radius);
    padding: 40px;
    max-width: 500px;
    text-align: center;
    box-shadow: 0 0 40px var(--neon-green);
}

.modal-title {
    font-family: 'Press Start 2P', monospace;
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--amber);
}

.modal-message {
    font-size: 1.3rem;
    margin-bottom: 30px;
    line-height: 1.6;
}

/* Footer */
.footer {
    margin-top: 40px;
    font-size: 0.9rem;
    color: #555;
}


/* ===========================
   THEME: Neon Arcade (Default)
   Loud, classic cabinet neon
   =========================== */
[data-theme="neon-arcade"] {
    --neon-green: #39ff14;
    --void-black: #07070b;
    --amber: #ffb000;
    --alert-red: #ff0055;
    --neon-blue: #00d9ff;
    --accent-rgb: 57, 255, 20;
    --danger-rgb: 255, 0, 85;

    --btn-radius: 0px;
    --btn-border-style: solid;
    --btn-border-width: 2px;
    --btn-shadow: 0 0 10px var(--neon-green);
    --btn-shadow-hover: 0 0 20px var(--neon-green), 0 0 40px var(--neon-green);
    --btn-hover-transform: scale(1.05);

    --transition-speed: 0.3s;
    --screen-anim: fadeIn;
    --title-shadow: 0 0 20px var(--neon-green), 0 0 40px var(--neon-green);
    --text-glow: 0 0 5px var(--neon-green);

    --bg-color: var(--void-black);
    --bg-pattern:
        repeating-linear-gradient(0deg, transparent, transparent 40px, rgba(57, 255, 20, 0.03) 40px, rgba(57, 255, 20, 0.03) 41px),
        repeating-linear-gradient(90deg, transparent, transparent 40px, rgba(57, 255, 20, 0.03) 40px, rgba(57, 255, 20, 0.03) 41px);
}
[data-theme="neon-arcade"] .crt-overlay { opacity: 1; }


/* ===========================
   THEME: Sunset Racer
   Outrun gradient, warm dusk
   =========================== */
[data-theme="sunset-racer"] {
    --neon-green: #ff6ec7;
    --void-black: #1a0033;
    --amber: #ffd900;
    --alert-red: #ff2a6d;
    --neon-blue: #3a86ff;
    --accent-rgb: 255, 110, 199;
    --danger-rgb: 255, 42, 109;

    --btn-radius: 4px;
    --btn-border-style: solid;
    --btn-border-width: 2px;
    --btn-shadow: 0 0 10px #ff6ec7, 0 0 20px rgba(255, 217, 0, 0.3);
    --btn-shadow-hover: 0 0 20px #ff6ec7, 0 0 40px #ffd900;
    --btn-hover-transform: translateY(-2px);

    --transition-speed: 0.25s;
    --screen-anim: slideInLeft;
    --title-shadow: 0 0 20px #ff6ec7, 0 0 40px #ffd900;
    --text-glow: 0 0 5px #ff6ec7;

    --bg-color: #1a0033;
    --bg-pattern:
        linear-gradient(180deg, #1a0033 0%, #2d1b4e 50%, #1a0033 100%),
        repeating-linear-gradient(135deg, transparent, transparent 20px, rgba(255, 110, 199, 0.04) 20px, rgba(255, 110, 199, 0.04) 22px);
}
[data-theme="sunset-racer"] .crt-overlay { opacity: 0.65; }


/* ===========================
   THEME: Deep Space Explorer
   Cold blues, star-map UI
   =========================== */
[data-theme="deep-space"] {
    --neon-green: #00d9ff;
    --void-black: #000814;
    --amber: #4dd0e1;
    --alert-red: #ff4d6d;
    --neon-blue: #4ea8ff;
    --accent-rgb: 0, 217, 255;
    --danger-rgb: 255, 77, 109;

    --btn-radius: 2px;
    --btn-border-style: solid;
    --btn-border-width: 3px;
    --btn-shadow: 0 0 15px rgba(0, 217, 255, 0.4);
    --btn-shadow-hover: 0 0 25px rgba(0, 217, 255, 0.6), 0 0 50px rgba(0, 217, 255, 0.3);
    --btn-hover-transform: scale(1.02);

    --transition-speed: 0.35s;
    --screen-anim: fadeIn;
    --title-shadow: 0 0 15px rgba(0, 217, 255, 0.8), 0 0 30px rgba(0, 217, 255, 0.4);
    --text-glow: 0 0 4px rgba(0, 217, 255, 0.6);

    --bg-color: #000814;
    --bg-pattern:
        radial-gradient(1px 1px at 10% 20%, rgba(0, 217, 255, 0.3), transparent),
        radial-gradient(1px 1px at 30% 65%, rgba(78, 168, 255, 0.2), transparent),
        radial-gradient(1.5px 1.5px at 55% 10%, rgba(77, 208, 225, 0.3), transparent),
        radial-gradient(1px 1px at 70% 80%, rgba(0, 217, 255, 0.2), transparent),
        radial-gradient(1.5px 1.5px at 85% 40%, rgba(78, 168, 255, 0.25), transparent),
        radial-gradient(1px 1px at 95% 75%, rgba(0, 217, 255, 0.15), transparent);
}
[data-theme="deep-space"] .crt-overlay { opacity: 0.55; }


/* ===========================
   THEME: Pixel Farm
   Cozy, earthy, low-glow
   =========================== */
[data-theme="pixel-farm"] {
    --neon-green: #2f5d3a;
    --void-black: #faf3e0;
    --amber: #b7791f;
    --alert-red: #9b2226;
    --neon-blue: #2b6cb0;
    --accent-rgb: 47, 93, 58;
    --danger-rgb: 155, 34, 38;

    --btn-radius: 8px;
    --btn-border-style: solid;
    --btn-border-width: 3px;
    --btn-shadow: 3px 3px 0px #3d2817;
    --btn-shadow-hover: 5px 5px 0px #3d2817;
    --btn-hover-transform: translate(-2px, -2px);

    --transition-speed: 0.4s;
    --screen-anim: bounceIn;
    --title-shadow: none;
    --text-glow: none;

    --bg-color: #faf3e0;
    --bg-pattern:
        linear-gradient(45deg, transparent 48%, rgba(47, 93, 58, 0.06) 48%, rgba(47, 93, 58, 0.06) 52%, transparent 52%),
        linear-gradient(-45deg, transparent 48%, rgba(183, 121, 31, 0.06) 48%, rgba(183, 121, 31, 0.06) 52%, transparent 52%);
    background-size: 20px 20px;
}
[data-theme="pixel-farm"] .crt-overlay { display: none; }
[data-theme="pixel-farm"] .title,
[data-theme="pixel-farm"] .screen-title,
[data-theme="pixel-farm"] .stat-value,
[data-theme="pixel-farm"] .equation,
[data-theme="pixel-farm"] .timer,
[data-theme="pixel-farm"] .score,
[data-theme="pixel-farm"] .lives,
[data-theme="pixel-farm"] .progress,
[data-theme="pixel-farm"] .result-value,
[data-theme="pixel-farm"] .drill-stats-bar { text-shadow: none; }
[data-theme="pixel-farm"] .menu-btn:hover,
[data-theme="pixel-farm"] .start-btn:hover,
[data-theme="pixel-farm"] .back-btn:hover,
[data-theme="pixel-farm"] .toggle-btn:hover {
    background: var(--neon-green);
    color: var(--void-black);
}
[data-theme="pixel-farm"] .footer { color: #8a7a5a; }


/* ===========================
   THEME: Dungeon Crawler
   Torchlight, stone + gold
   =========================== */
[data-theme="dungeon-crawler"] {
    --neon-green: #d4af37;
    --void-black: #1c1410;
    --amber: #cd7f32;
    --alert-red: #8b0000;
    --neon-blue: #6c5ce7;
    --accent-rgb: 212, 175, 55;
    --danger-rgb: 139, 0, 0;

    --btn-radius: 0px;
    --btn-border-style: ridge;
    --btn-border-width: 4px;
    --btn-shadow: inset 2px 2px 4px rgba(0, 0, 0, 0.5), 0 0 8px rgba(212, 175, 55, 0.3);
    --btn-shadow-hover: inset 1px 1px 2px rgba(0, 0, 0, 0.3), 0 0 15px rgba(212, 175, 55, 0.5);
    --btn-hover-transform: scale(1.03);

    --transition-speed: 0.35s;
    --screen-anim: fadeIn;
    --title-shadow: 0 0 15px rgba(212, 175, 55, 0.6), 0 2px 4px rgba(0, 0, 0, 0.8);
    --text-glow: 0 0 4px rgba(212, 175, 55, 0.4);

    --bg-color: #1c1410;
    --bg-pattern:
        repeating-linear-gradient(0deg, transparent, transparent 30px, rgba(15, 10, 8, 0.6) 30px, rgba(15, 10, 8, 0.6) 32px),
        repeating-linear-gradient(90deg, transparent, transparent 50px, rgba(15, 10, 8, 0.6) 50px, rgba(15, 10, 8, 0.6) 52px);
}
[data-theme="dungeon-crawler"] .crt-overlay { opacity: 0.35; }
[data-theme="dungeon-crawler"] #game-canvas { background: rgba(0, 0, 0, 0.65); }
[data-theme="dungeon-crawler"] .menu-btn:hover,
[data-theme="dungeon-crawler"] .start-btn:hover,
[data-theme="dungeon-crawler"] .back-btn:hover,
[data-theme="dungeon-crawler"] .toggle-btn:hover {
    background: var(--neon-green);
    color: var(--void-black);
}


/* ===========================
   THEME: Bauhaus
   Flat primaries, no glow
   =========================== */
[data-theme="bauhaus"] {
    --neon-green: #111111;
    --void-black: #ffffff;
    --amber: #ffcc00;
    --alert-red: #e10600;
    --neon-blue: #0057b8;
    --accent-rgb: 17, 17, 17;
    --danger-rgb: 225, 6, 0;

    --btn-radius: 0px;
    --btn-border-style: solid;
    --btn-border-width: 4px;
    --btn-shadow: none;
    --btn-shadow-hover: 4px 4px 0px #111;
    --btn-hover-transform: translate(2px, 2px);

    --transition-speed: 0.1s;
    --screen-anim: fadeIn;
    --title-shadow: none;
    --text-glow: none;

    --bg-color: #ffffff;
    --bg-pattern:
        repeating-linear-gradient(0deg, transparent, transparent 99px, rgba(0, 0, 0, 0.08) 99px, rgba(0, 0, 0, 0.08) 100px),
        repeating-linear-gradient(90deg, transparent, transparent 99px, rgba(0, 0, 0, 0.08) 99px, rgba(0, 0, 0, 0.08) 100px);
}
[data-theme="bauhaus"] .crt-overlay { display: none; }
[data-theme="bauhaus"] .title,
[data-theme="bauhaus"] .screen-title,
[data-theme="bauhaus"] .stat-value,
[data-theme="bauhaus"] .equation,
[data-theme="bauhaus"] .timer,
[data-theme="bauhaus"] .score,
[data-theme="bauhaus"] .lives,
[data-theme="bauhaus"] .progress,
[data-theme="bauhaus"] .result-value,
[data-theme="bauhaus"] .drill-stats-bar,
[data-theme="bauhaus"] .menu-btn,
[data-theme="bauhaus"] .start-btn,
[data-theme="bauhaus"] .back-btn,
[data-theme="bauhaus"] .toggle-btn,
[data-theme="bauhaus"] .danger-btn { text-shadow: none; }
[data-theme="bauhaus"] .menu-btn:hover,
[data-theme="bauhaus"] .start-btn:hover,
[data-theme="bauhaus"] .back-btn:hover,
[data-theme="bauhaus"] .toggle-btn:hover {
    background: var(--neon-green);
    color: var(--void-black);
    box-shadow: 4px 4px 0 #111;
    transform: translate(2px, 2px);
}
[data-theme="bauhaus"] .answer-input {
    box-shadow: none;
}
[data-theme="bauhaus"] .answer-input:focus {
    box-shadow: 4px 4px 0 #111;
    animation: none;
}
[data-theme="bauhaus"] .theme-selector {
    box-shadow: none;
}
[data-theme="bauhaus"] .theme-selector:hover {
    box-shadow: 4px 4px 0 #111;
}
[data-theme="bauhaus"] .footer { color: #999; }


/* ===========================
   THEME: Fantasy
   Parchment + emerald + wax
   =========================== */
[data-theme="fantasy"] {
    --neon-green: #2a2a2a;
    --void-black: #f6f0dc;
    --amber: #2a9d8f;
    --alert-red: #b23a48;
    --neon-blue: #3a86ff;
    --accent-rgb: 42, 42, 42;
    --danger-rgb: 178, 58, 72;

    --btn-radius: 12px;
    --btn-border-style: double;
    --btn-border-width: 3px;
    --btn-shadow: 0 4px 8px rgba(42, 42, 42, 0.2);
    --btn-shadow-hover: 0 6px 16px rgba(42, 157, 143, 0.4), 0 0 20px rgba(42, 157, 143, 0.2);
    --btn-hover-transform: scale(1.05);

    --transition-speed: 0.5s;
    --screen-anim: fadeInScale;
    --title-shadow: none;
    --text-glow: none;

    --bg-color: #f6f0dc;
    --bg-pattern:
        repeating-linear-gradient(45deg, transparent, transparent 15px, rgba(42, 157, 143, 0.05) 15px, rgba(42, 157, 143, 0.05) 16px),
        repeating-linear-gradient(-45deg, transparent, transparent 15px, rgba(178, 58, 72, 0.04) 15px, rgba(178, 58, 72, 0.04) 16px);
}
[data-theme="fantasy"] .crt-overlay { opacity: 0.10; }
[data-theme="fantasy"] .title,
[data-theme="fantasy"] .screen-title,
[data-theme="fantasy"] .stat-value,
[data-theme="fantasy"] .equation,
[data-theme="fantasy"] .timer,
[data-theme="fantasy"] .score,
[data-theme="fantasy"] .lives,
[data-theme="fantasy"] .progress,
[data-theme="fantasy"] .result-value,
[data-theme="fantasy"] .drill-stats-bar { text-shadow: none; }
[data-theme="fantasy"] .menu-btn:hover,
[data-theme="fantasy"] .start-btn:hover,
[data-theme="fantasy"] .back-btn:hover,
[data-theme="fantasy"] .toggle-btn:hover {
    background: var(--amber);
    color: var(--void-black);
    border-color: var(--amber);
}
[data-theme="fantasy"] .footer { color: #8a7a5a; }


/* ===========================
   THEME: Gothic
   Black, crimson, cathedral
   =========================== */
[data-theme="gothic"] {
    --neon-green: #e7e3da;
    --void-black: #07060a;
    --amber: #7b2cbf;
    --alert-red: #c1121f;
    --neon-blue: #2ec4b6;
    --accent-rgb: 231, 227, 218;
    --danger-rgb: 193, 18, 31;

    --btn-radius: 4px 4px 12px 12px;
    --btn-border-style: solid;
    --btn-border-width: 2px;
    --btn-shadow: 0 0 12px rgba(193, 18, 31, 0.4), 0 0 4px rgba(231, 227, 218, 0.2);
    --btn-shadow-hover: 0 0 25px var(--alert-red), 0 0 50px rgba(193, 18, 31, 0.5);
    --btn-hover-transform: scale(1.08);

    --transition-speed: 0.4s;
    --screen-anim: fadeFromDark;
    --title-shadow: 0 0 20px rgba(193, 18, 31, 0.6), 0 0 40px rgba(123, 44, 191, 0.3);
    --text-glow: 0 0 5px rgba(231, 227, 218, 0.3);

    --bg-color: #07060a;
    --bg-pattern:
        radial-gradient(ellipse at 50% 0%, rgba(193, 18, 31, 0.06) 0%, transparent 50%),
        repeating-linear-gradient(0deg, transparent, transparent 40px, rgba(123, 44, 191, 0.04) 40px, rgba(123, 44, 191, 0.04) 42px),
        repeating-linear-gradient(90deg, transparent, transparent 60px, rgba(193, 18, 31, 0.03) 60px, rgba(193, 18, 31, 0.03) 62px);
}
[data-theme="gothic"] .crt-overlay { opacity: 0.40; }
[data-theme="gothic"] .menu-btn:hover,
[data-theme="gothic"] .start-btn:hover,
[data-theme="gothic"] .back-btn:hover,
[data-theme="gothic"] .toggle-btn:hover {
    background: var(--alert-red);
    color: var(--void-black);
    border-color: var(--alert-red);
    box-shadow: 0 0 25px var(--alert-red), 0 0 50px rgba(193, 18, 31, 0.5);
}


/* ===========================
   Poker Drill Styles
   =========================== */

/* Poker Config Toggles */
.poker-toggles {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.poker-toggle {
    font-family: 'Press Start 2P', monospace;
    font-size: 0.55rem;
    width: 80px;
    height: 64px;
    background: transparent;
    border: var(--btn-border-width) var(--btn-border-style) var(--neon-green);
    border-radius: var(--btn-radius);
    color: var(--neon-green);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    line-height: 1.4;
    opacity: 0.4;
    padding: 4px;
}

.poker-toggle:hover {
    transform: scale(1.05);
    opacity: 0.7;
}

.poker-toggle.active {
    background: var(--neon-green);
    color: var(--void-black);
    box-shadow: 0 0 15px var(--neon-green);
    opacity: 1;
}

/* Card Rendering */
.poker-card-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    margin: 16px 0;
}

.poker-hand-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.poker-hand-label {
    font-family: 'Press Start 2P', monospace;
    font-size: 0.5rem;
    color: var(--neon-green);
    opacity: 0.6;
    text-shadow: var(--text-glow);
}

.poker-hand-cards {
    display: flex;
    gap: 8px;
}

.poker-vs {
    font-family: 'Press Start 2P', monospace;
    font-size: 0.7rem;
    color: var(--alert-red);
    text-shadow: 0 0 8px var(--alert-red);
}

.poker-card {
    width: 52px;
    height: 72px;
    background: var(--void-black);
    border: 2px solid var(--neon-green);
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: 'Press Start 2P', monospace;
    box-shadow: 0 0 6px rgba(var(--accent-rgb), 0.3);
    position: relative;
}

.poker-card .card-rank {
    font-size: 0.9rem;
    line-height: 1;
}

.poker-card .card-suit {
    font-size: 1rem;
    line-height: 1;
    margin-top: 2px;
}

.poker-card.suit-h .card-rank,
.poker-card.suit-h .card-suit,
.poker-card.suit-d .card-rank,
.poker-card.suit-d .card-suit {
    color: var(--alert-red);
}

.poker-card.suit-s .card-rank,
.poker-card.suit-s .card-suit,
.poker-card.suit-c .card-rank,
.poker-card.suit-c .card-suit {
    color: var(--neon-green);
}

/* Equity Slider */
.equity-slider-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    width: 100%;
    max-width: 400px;
    margin: 16px auto;
}

.equity-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: rgba(var(--accent-rgb), 0.2);
    border-radius: 4px;
    outline: none;
}

.equity-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--neon-green);
    cursor: pointer;
    box-shadow: 0 0 10px var(--neon-green);
}

.equity-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--neon-green);
    cursor: pointer;
    box-shadow: 0 0 10px var(--neon-green);
    border: none;
}

.equity-slider-value {
    font-family: 'Press Start 2P', monospace;
    font-size: 1.2rem;
    color: var(--neon-green);
    text-shadow: var(--text-glow);
}

/* Range Grid */
.range-grid {
    display: grid;
    grid-template-columns: repeat(13, 1fr);
    gap: 2px;
    max-width: 520px;
    margin: 16px auto;
    user-select: none;
    -webkit-user-select: none;
}

.range-cell {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'VT323', monospace;
    font-size: clamp(0.5rem, 1.8vw, 0.75rem);
    background: transparent;
    border: 1px solid rgba(var(--accent-rgb), 0.25);
    border-radius: 2px;
    color: var(--neon-green);
    cursor: pointer;
    transition: background 0.1s ease;
    opacity: 0.6;
}

.range-cell:hover {
    opacity: 0.9;
    border-color: var(--neon-green);
}

.range-cell.selected {
    background: var(--neon-green);
    color: var(--void-black);
    opacity: 1;
    box-shadow: 0 0 4px rgba(var(--accent-rgb), 0.5);
}

.range-cell.correct-cell {
    background: var(--neon-green);
    color: var(--void-black);
    opacity: 1;
}

.range-cell.wrong-cell {
    background: var(--alert-red);
    color: var(--void-black);
    opacity: 1;
}

/* Explanation Panel (wrong answer breakdown) */
.poker-explanation {
    border: 2px var(--btn-border-style) var(--alert-red);
    border-radius: var(--btn-radius);
    padding: 16px;
    margin: 16px auto;
    max-width: 500px;
    text-align: left;
}

.explanation-answer {
    font-family: 'Press Start 2P', monospace;
    font-size: 1rem;
    color: var(--alert-red);
    margin-bottom: 12px;
    text-shadow: 0 0 5px rgba(var(--danger-rgb), 0.5);
}

.explanation-steps {
    font-family: 'VT323', monospace;
    font-size: 1.2rem;
    color: var(--neon-green);
    line-height: 1.6;
    white-space: pre-line;
}

/* Calculation Guide Cards */
.guide-card {
    border: 2px var(--btn-border-style) var(--neon-green);
    border-radius: var(--btn-radius);
    padding: 16px;
    margin-bottom: 16px;
    text-align: left;
}

.guide-title {
    font-family: 'Press Start 2P', monospace;
    font-size: 0.8rem;
    color: var(--amber);
    margin-bottom: 10px;
}

.guide-body {
    font-family: 'VT323', monospace;
    font-size: 1.1rem;
    line-height: 1.6;
    color: var(--neon-green);
}

.guide-body p {
    margin-bottom: 4px;
}

.guide-body strong {
    color: var(--amber);
}

/* Light theme poker overrides */
[data-theme="pixel-farm"] .poker-card,
[data-theme="bauhaus"] .poker-card,
[data-theme="fantasy"] .poker-card {
    text-shadow: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

[data-theme="pixel-farm"] .poker-card.suit-s .card-rank,
[data-theme="pixel-farm"] .poker-card.suit-s .card-suit,
[data-theme="pixel-farm"] .poker-card.suit-c .card-rank,
[data-theme="pixel-farm"] .poker-card.suit-c .card-suit,
[data-theme="bauhaus"] .poker-card.suit-s .card-rank,
[data-theme="bauhaus"] .poker-card.suit-s .card-suit,
[data-theme="bauhaus"] .poker-card.suit-c .card-rank,
[data-theme="bauhaus"] .poker-card.suit-c .card-suit,
[data-theme="fantasy"] .poker-card.suit-s .card-rank,
[data-theme="fantasy"] .poker-card.suit-s .card-suit,
[data-theme="fantasy"] .poker-card.suit-c .card-rank,
[data-theme="fantasy"] .poker-card.suit-c .card-suit {
    color: #1a1a1a;
}

/* ===========================
   Mobile Responsiveness
   =========================== */
@media (max-width: 768px) {
    .stats-bar {
        gap: 20px;
    }

    .game-header {
        flex-direction: column;
        gap: 15px;
    }

    .menu-btn, .start-btn {
        min-width: 150px;
        padding: 12px 20px;
    }

    .op-toggles {
        gap: 8px;
    }

    .op-toggle {
        width: 52px;
        height: 52px;
        font-size: 1rem;
    }

    .fin-toggles {
        gap: 6px;
    }

    .fin-toggle,
    .poker-toggle {
        width: 68px;
        height: 52px;
        font-size: 0.45rem;
    }

    .poker-card {
        width: 42px;
        height: 58px;
    }

    .poker-card .card-rank {
        font-size: 0.7rem;
    }

    .poker-card .card-suit {
        font-size: 0.8rem;
    }

    .range-grid {
        gap: 1px;
        max-width: 360px;
    }

    .range-cell {
        font-size: 0.4rem;
    }

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

    .setting {
        flex-direction: column;
        gap: 15px;
    }
}

/* Touch-friendly */
@media (hover: none) and (pointer: coarse) {
    .menu-btn, .start-btn, .back-btn, .toggle-btn {
        min-height: 48px;
        min-width: 48px;
    }
}