:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e1b4b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent-1: #8b5cf6;
    --accent-2: #ec4899;
    --accent-3: #10b981;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --font-main: 'Outfit', sans-serif;
    --font-display: 'Space Grotesk', sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
    -webkit-user-select: none;
    touch-action: manipulation;
}

body {
    background: var(--bg-primary);
    background: radial-gradient(circle at 50% 0%, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    color: var(--text-main);
    font-family: var(--font-main);
    height: 100vh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

#app {
    width: 100%;
    max-width: 500px;
    height: 100%;
    position: relative;
    overflow: hidden;
}

.screen {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0; min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 24px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    transform: scale(0.95);
    z-index: 1;
}

.screen.active {
    opacity: 1;
    pointer-events: auto; overflow-y: auto;
    transform: scale(1);
    z-index: 10;
}

.glow-text {
    font-family: var(--font-display);
    background: linear-gradient(to right, var(--accent-1), var(--accent-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 20px rgba(139, 92, 246, 0.5);
}

.text-center { text-align: center; }
.mt-4 { margin-top: 1rem; }

/* Menu Styles */
.logo-container { flex-shrink: 0;
    text-align: center;
    margin-top: 4vh;
    margin-bottom: 20px;
}
.logo { font-size: 3rem; font-weight: 800; letter-spacing: 2px; }
.tagline { font-size: 0.9rem; color: var(--text-muted); letter-spacing: 3px; margin-top: 8px;}

.glass-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 24px;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.profile-panel { flex-shrink: 0;
    text-align: center;
    margin-bottom: 20px;
}
.rank-badge {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--accent-1);
    margin-bottom: 12px;
}
.xp-bar-container {
    height: 8px;
    background: rgba(0,0,0,0.3);
    border-radius: 4px;
    overflow: hidden;
}
.xp-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
    transition: width 0.5s ease;
}

.menu-buttons { flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: auto;
    margin-bottom: 4vh;
}

.cyber-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    padding: 16px;
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    letter-spacing: 1px;
}
.cyber-btn:hover, .cyber-btn:active {
    transform: translateY(-2px);
    background: rgba(255,255,255,0.1);
}
.cyber-btn.primary {
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    border: none;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
}
.cyber-btn.primary:hover, .cyber-btn.primary:active {
    box-shadow: 0 6px 20px rgba(236, 72, 153, 0.6);
}

/* Game Header */
.game-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}
.icon-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    width: 44px; height: 44px;
    border-radius: 12px;
    display: flex; justify-content: center; align-items: center;
    cursor: pointer;
}
.hud-stats {
    display: flex;
    gap: 20px;
}
.stat-box {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.stat-box .label { font-size: 0.7rem; color: var(--text-muted); font-weight: 600; letter-spacing: 1px;}
.stat-box .val { font-size: 1.2rem; font-family: var(--font-display); font-weight: 700; }
.combo-badge {
    background: var(--accent-2);
    color: #fff;
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 800;
    font-family: var(--font-display);
    opacity: 0;
    transition: all 0.2s ease;
}

/* Game Area */
.game-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.word-preview-container {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin-bottom: 20px;
}
.word-preview {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: 4px;
    color: var(--text-muted);
    transition: all 0.2s ease;
}
.word-preview.valid {
    color: var(--accent-3);
    text-shadow: 0 0 15px rgba(16, 185, 129, 0.5);
    transform: scale(1.05);
}
.word-preview.invalid {
    color: #ef4444;
}

.board-container {
    position: relative;
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1;
}

.letter-grid {
    width: 100%;
    height: 100%;
    display: grid;
    gap: 12px;
    padding: 12px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: inset 0 0 20px rgba(0,0,0,0.2);
}

.letter-cell {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-main);
    transition: transform 0.1s ease, background 0.2s ease;
    cursor: pointer;
    position: relative;
}
.letter-cell.selected {
    background: rgba(139, 92, 246, 0.2);
    border-color: var(--accent-1);
    transform: scale(0.95);
    color: #fff;
    text-shadow: 0 0 10px var(--accent-1);
}

#swipe-canvas {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 5;
}

.powerups {
    margin-top: 24px;
    display: flex;
    gap: 16px;
}
.power-btn {
    background: var(--glass-bg);
    border: 1px solid var(--accent-1);
    color: var(--accent-1);
    width: 50px; height: 50px;
    border-radius: 25px;
    display: flex; justify-content: center; align-items: center;
    cursor: pointer;
}

.found-words-container {
    margin-top: 20px;
    flex: 1;
    width: 100%;
    overflow-y: auto;
}
.found-words {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}
.word-pill {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--accent-3);
    padding: 6px 12px;
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: 600;
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes popIn {
    0% { transform: scale(0); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.floating-score {
    position: absolute;
    top: -20px;
    color: var(--accent-3);
    font-weight: 800;
    animation: floatUp 1s ease-out forwards;
    pointer-events: none;
    z-index: 10;
}
@keyframes floatUp {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(-30px); opacity: 0; }
}

/* Result / Stats */
.result-panel {
    margin: auto 0;
    text-align: center;
}
.result-stats {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin: 30px 0;
}
.res-item span { font-size: 0.8rem; color: var(--text-muted); }
.res-item h3 { font-size: 1.5rem; font-family: var(--font-display); }
.highlight { color: var(--accent-2); }

.stats-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 30px;
}
.st-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 8px;
}
.st-item span { color: var(--text-muted); font-size: 0.9rem; }
.st-item strong { font-family: var(--font-display); font-size: 1.1rem; }

.letter-cell.hinted {
    background: rgba(236, 72, 153, 0.4);
    border-color: var(--accent-2);
    box-shadow: 0 0 15px var(--accent-2);
    animation: pulseHint 1s infinite alternate;
}
@keyframes pulseHint {
    0% { transform: scale(1); }
    100% { transform: scale(1.1); }
}

.diff-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 16px;
    flex-shrink: 0;
}
.diff-btn {
    padding: 10px;
    font-size: 0.9rem;
    background: rgba(0,0,0,0.4);
    color: var(--text-muted);
}
.diff-btn.active {
    background: var(--accent-1);
    color: #fff;
    border-color: var(--accent-2);
    box-shadow: 0 0 10px rgba(236, 72, 153, 0.4);
}

.target-words-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 16px;
    width: 100%;
    max-width: 400px;
    min-height: 40px;
}
.target-word {
    background: rgba(0,0,0,0.3);
    border: 1px solid rgba(255,255,255,0.1);
    padding: 6px 12px;
    border-radius: 8px;
    font-family: var(--font-display);
    font-size: 0.9rem;
    color: var(--text-muted);
    letter-spacing: 1px;
    transition: all 0.3s ease;
}
.target-word.found {
    background: rgba(16, 185, 129, 0.2);
    border-color: rgba(16, 185, 129, 0.5);
    color: var(--accent-3);
    text-decoration: line-through;
    transform: scale(0.95);
}