:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    
    /* Neon Cyan Default Theme */
    --accent: #06b6d4;
    --accent-glow: rgba(6, 182, 212, 0.5);
    --error: #ef4444;
    --error-glow: rgba(239, 68, 68, 0.5);
    --success: #10b981;
    
    --font-ui: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

[data-theme="cyber-pink"] {
    --bg-primary: #2e1065; --bg-secondary: #4c1d95;
    --accent: #ec4899; --accent-glow: rgba(236, 72, 153, 0.5);
}
[data-theme="matrix-green"] {
    --bg-primary: #022c22; --bg-secondary: #064e3b;
    --accent: #10b981; --accent-glow: rgba(16, 185, 129, 0.5);
}
[data-theme="midnight-purple"] {
    --bg-primary: #171717; --bg-secondary: #262626;
    --accent: #a855f7; --accent-glow: rgba(168, 85, 247, 0.5);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-ui);
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
    transition: background-color 0.5s;
}

#game-container {
    position: relative; width: 100vw; height: 100vh;
}
#particle-canvas, #falling-canvas {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; pointer-events: none;
}
#ui-layer {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 10; pointer-events: none;
}

.screen {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    opacity: 0; visibility: hidden; transition: 0.3s ease; pointer-events: auto;
    background: radial-gradient(circle at center, transparent 0%, var(--bg-primary) 100%);
}
.screen.active { opacity: 1; visibility: visible; }
#screen-game-typing, #screen-game-falling { background: transparent; }

/* Text Styles */
.logo { font-size: 5rem; font-weight: 800; letter-spacing: -2px; margin-bottom: 0.5rem; }
.highlight { color: var(--accent); text-shadow: 0 0 20px var(--accent-glow); }
.subtitle { font-size: 1.2rem; color: var(--text-secondary); letter-spacing: 4px; margin-bottom: 3rem; text-align: center; }
h2 { font-size: 2.5rem; margin-bottom: 2rem; color: var(--text-primary); letter-spacing: 2px; }

/* Buttons */
.btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-primary);
    padding: 1rem 2rem; font-size: 1.1rem; font-weight: 600;
    border-radius: 8px; cursor: pointer; transition: all 0.2s;
    display: flex; align-items: center; justify-content: center; gap: 0.5rem;
    min-width: 250px; backdrop-filter: blur(10px);
}
.btn:hover { background: rgba(255,255,255,0.1); transform: translateY(-2px); }
.btn.primary { background: var(--accent); color: #fff; border: none; box-shadow: 0 4px 20px var(--accent-glow); }
.btn.primary:hover { filter: brightness(1.2); }
.menu-buttons { display: flex; flex-direction: column; gap: 1rem; }
.menu-buttons.horizontal { flex-direction: row; }

/* Modes Grid */
.modes-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-bottom: 2rem; }
.mode-card {
    background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.1);
    padding: 2rem; border-radius: 12px; cursor: pointer; text-align: center;
    transition: all 0.2s; min-width: 200px;
}
.mode-card:hover { border-color: var(--accent); background: rgba(255,255,255,0.08); box-shadow: 0 0 20px var(--accent-glow); transform: scale(1.05); }
.mode-card .material-icons { font-size: 3rem; color: var(--accent); margin-bottom: 1rem; }
.mode-card h3 { font-size: 1.2rem; margin-bottom: 0.5rem; }
.mode-card p { color: var(--text-secondary); font-size: 0.9rem; }

/* Typing Interface */
.hud {
    position: absolute; top: 2rem; width: 100%; max-width: 1000px; padding: 0 2rem;
    display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: 1.5rem; font-weight: 700;
}
.hud-item { display: flex; align-items: center; gap: 0.5rem; color: var(--text-secondary); }
.hud-item span:not(.material-icons) { color: var(--text-primary); }
.text-red { color: var(--error) !important; } .text-green { color: var(--success) !important; }

.typing-container {
    width: 90%; max-width: 1000px; font-family: var(--font-mono); font-size: 2rem;
    line-height: 1.6; color: var(--text-secondary); position: relative;
    height: 150px; overflow: hidden;
}
#words-wrapper { transition: transform 0.2s ease-out; }
.word { margin-right: 0.8rem; display: inline-block; position: relative; }
.letter { transition: color 0.1s; }
.letter.correct { color: var(--text-primary); }
.letter.incorrect { color: var(--error); text-shadow: 0 0 10px var(--error-glow); border-bottom: 2px solid var(--error); }
.word.active .letter.active-letter { border-left: 2px solid var(--accent); animation: blink 1s infinite; margin-left: -2px; }

@keyframes blink { 50% { border-color: transparent; } }

.controls-hint { position: absolute; bottom: 2rem; color: var(--text-secondary); font-size: 0.9rem; }
kbd { background: rgba(255,255,255,0.1); padding: 0.2rem 0.5rem; border-radius: 4px; font-family: var(--font-mono); }

/* Falling Words */
.falling-input-display {
    position: absolute; bottom: 20%; font-family: var(--font-mono); font-size: 2.5rem;
    color: var(--text-primary); text-shadow: 0 0 15px var(--accent-glow); letter-spacing: 2px;
}

/* Stats */
.stats-card { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.1); border-radius: 12px; padding: 2rem; width: 90%; max-width: 600px; margin-bottom: 2rem; }
.rank-display { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.5rem; }
.rank-icon { font-size: 4rem; color: var(--accent); text-shadow: 0 0 15px var(--accent-glow); }
.xp-bar-container { width: 100%; height: 12px; background: rgba(255,255,255,0.1); border-radius: 6px; overflow: hidden; margin-bottom: 0.5rem; }
.xp-bar { height: 100%; background: var(--accent); width: 0%; transition: width 0.5s ease-out; box-shadow: 0 0 10px var(--accent-glow); }
.xp-text { text-align: right; color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 2rem; }
.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.stat-box { background: rgba(0,0,0,0.2); padding: 1.5rem; border-radius: 8px; text-align: center; }
.stat-box h4 { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 0.5rem; }
.stat-box p { font-size: 2rem; font-weight: 700; font-family: var(--font-mono); }

/* Themes */
.theme-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 2rem; }
.theme-card { cursor: pointer; text-align: center; opacity: 0.6; transition: 0.2s; }
.theme-card:hover, .theme-card.active { opacity: 1; transform: scale(1.05); }
.theme-preview { width: 150px; height: 80px; border-radius: 8px; border: 2px solid transparent; margin-bottom: 0.5rem; box-shadow: 0 4px 15px rgba(0,0,0,0.3); }
.theme-card.active .theme-preview { box-shadow: 0 0 20px rgba(255,255,255,0.2); }

/* Result Screen */
.result-stats { display: flex; flex-wrap: wrap; justify-content: center; gap: 1.5rem; margin-bottom: 3rem; }
.result-box { background: rgba(255,255,255,0.05); padding: 1.5rem 2rem; border-radius: 12px; text-align: center; min-width: 150px; border: 1px solid rgba(255,255,255,0.1); }
.result-box.main-box { border-color: var(--accent); box-shadow: 0 0 20px rgba(0,0,0,0.5), inset 0 0 20px var(--accent-glow); }
.result-box.main-box .result-value { font-size: 4rem; text-shadow: 0 0 20px var(--accent-glow); }
.result-label { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 0.5rem; font-weight: 600; }
.result-value { font-size: 2.5rem; font-weight: 700; font-family: var(--font-mono); }

@media (max-width: 768px) {
    .modes-grid { grid-template-columns: 1fr; }
    .typing-container { font-size: 1.5rem; }
    .logo { font-size: 3.5rem; }
    .menu-buttons.horizontal { flex-direction: column; }
}