:root {
    /* Light Mode Colors */
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-inverse: #ffffff;
    --border-color: #dee2e6;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-lg: rgba(0, 0, 0, 0.15);
    
    /* Game Colors */
    --tile-bg: #ffffff;
    --tile-border: #d3d6da;
    --tile-filled: #878a8c;
    --correct: #6aaa64;
    --present: #c9b458;
    --absent: #787c7e;
    
    /* Accent Colors */
    --accent-primary: #5865f2;
    --accent-secondary: #7289da;
    --accent-hover: #4752c4;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    /* Dark Mode Colors */
    --bg-primary: #1a1d29;
    --bg-secondary: #25293a;
    --bg-tertiary: #2f3446;
    --text-primary: #e4e6eb;
    --text-secondary: #b0b3b8;
    --text-inverse: #1a1d29;
    --border-color: #3a3f52;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-lg: rgba(0, 0, 0, 0.5);
    
    /* Game Colors - Darker */
    --tile-bg: #25293a;
    --tile-border: #3a3f52;
    --tile-filled: #565a6e;
    --correct: #538d4e;
    --present: #b59f3b;
    --absent: #3a3a3c;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    transition: var(--transition);
}

.container {
    max-width: 600px;
    width: 100%;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
}

.header-top {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    margin-bottom: 20px;
    gap: 10px;
}

.settings-group {
    display: flex;
    gap: 10px;
    align-items: center;
}

.icon-btn {
    width: 44px;
    height: 44px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    transition: var(--transition);
    color: var(--text-primary);
}

.icon-btn:hover {
    background: var(--bg-tertiary);
    transform: scale(1.05);
}

.icon-btn:active {
    transform: scale(0.95);
}

.theme-icon {
    transition: var(--transition);
}

[data-theme="light"] .sun-icon {
    display: none;
}

[data-theme="light"] .moon-icon {
    display: block;
}

[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

.language-select {
    padding: 10px 15px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    outline: none;
}

.language-select:hover {
    background: var(--bg-tertiary);
}

.language-select:focus {
    border-color: var(--accent-primary);
}

header h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: 10px;
    font-weight: 700;
    letter-spacing: -0.02em;
    animation: fadeInDown 0.6s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: clamp(40px, 8vw, 56px);
    height: clamp(40px, 8vw, 56px);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 12px;
    color: white;
    font-weight: 900;
    font-size: clamp(1.5rem, 4vw, 2rem);
    box-shadow: 0 4px 12px var(--shadow);
}

.subtitle {
    font-size: clamp(0.9rem, 2vw, 1.1rem);
    color: var(--text-secondary);
    font-weight: 500;
}

/* Game Container */
.game-container {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: clamp(20px, 4vw, 40px);
    box-shadow: 0 4px 20px var(--shadow);
    animation: fadeIn 0.8s ease;
}

.message {
    text-align: center;
    min-height: 32px;
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 20px;
    color: var(--accent-primary);
    transition: var(--transition);
    border-radius: 8px;
    padding: 8px;
}

.message.error {
    color: #e74c3c;
    background: rgba(231, 76, 60, 0.1);
}

.message.success {
    color: #27ae60;
    background: rgba(39, 174, 96, 0.1);
}

.message.success::before {
    content: '✓';
    display: inline-block;
    margin-right: 8px;
    font-weight: 900;
    font-size: 1.2em;
}

.message.error::before {
    content: '✕';
    display: inline-block;
    margin-right: 8px;
    font-weight: 900;
    font-size: 1.2em;
}

/* Board */
.board {
    display: grid;
    gap: 6px;
    margin: 0 auto 30px;
    max-width: 350px;
}

.row {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
}

.tile {
    width: 100%;
    aspect-ratio: 1;
    border: 2px solid var(--tile-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    text-transform: uppercase;
    border-radius: 8px;
    transition: var(--transition);
    background: var(--tile-bg);
    color: var(--text-primary);
}

.tile.filled {
    border-color: var(--tile-filled);
    animation: pop 0.1s ease;
}

.tile.correct {
    background: var(--correct);
    border-color: var(--correct);
    color: var(--text-inverse);
    animation: flip 0.5s ease;
}

.tile.present {
    background: var(--present);
    border-color: var(--present);
    color: var(--text-inverse);
    animation: flip 0.5s ease;
}

.tile.absent {
    background: var(--absent);
    border-color: var(--absent);
    color: var(--text-inverse);
    animation: flip 0.5s ease;
}

/* Keyboard */
.keyboard {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 20px;
}

.keyboard-row {
    display: flex;
    gap: 4px;
    justify-content: center;
}

.key {
    padding: clamp(12px, 2vw, 16px);
    min-width: clamp(28px, 5vw, 44px);
    border: none;
    border-radius: 8px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: clamp(0.75rem, 2vw, 1rem);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    user-select: none;
}

.key:hover {
    background: var(--border-color);
    transform: scale(1.05);
}

.key:active {
    transform: scale(0.95);
}

.key.wide {
    padding: clamp(12px, 2vw, 16px) clamp(15px, 3vw, 25px);
    font-size: clamp(0.7rem, 1.8vw, 0.85rem);
}

.key.correct {
    background: var(--correct);
    color: var(--text-inverse);
}

.key.present {
    background: var(--present);
    color: var(--text-inverse);
}

.key.absent {
    background: var(--absent);
    color: var(--text-inverse);
}

/* Controls */
.controls {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 14px 28px;
    border: none;
    border-radius: 12px;
    color: white;
    font-size: clamp(0.9rem, 2vw, 1rem);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 2px 8px var(--shadow);
    min-width: 140px;
    justify-content: center;
}

.btn-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.btn-primary {
    background: var(--accent-primary);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-lg);
}

.btn-secondary {
    background: var(--accent-secondary);
}

.btn-secondary:hover {
    background: #5f73bc;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-lg);
}

.btn:active {
    transform: translateY(0);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: var(--bg-secondary);
    margin: 10% auto;
    padding: clamp(25px, 5vw, 40px);
    border-radius: 20px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 20px 60px var(--shadow-lg);
    animation: slideIn 0.3s ease;
    color: var(--text-primary);
}

.close {
    color: var(--text-secondary);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 20px;
    transition: var(--transition);
}

.close:hover {
    color: var(--text-primary);
}

.modal-content h2 {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-top: 30px;
}

.stat-item {
    text-align: center;
    padding: clamp(15px, 3vw, 25px);
    background: var(--bg-tertiary);
    border-radius: 12px;
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.stat-value {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--accent-primary);
}

.stat-label {
    font-size: clamp(0.75rem, 2vw, 0.9rem);
    color: var(--text-secondary);
    font-weight: 500;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 30px;
    color: var(--text-secondary);
    font-size: clamp(0.8rem, 2vw, 0.9rem);
}

footer a:hover {
    color: var(--accent-primary) !important;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

@keyframes pop {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

@keyframes flip {
    0% {
        transform: rotateX(0);
    }
    50% {
        transform: rotateX(90deg);
    }
    100% {
        transform: rotateX(0);
    }
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Mobile Optimizations */
@media (max-width: 640px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 0;
    }
    
    header {
        margin-bottom: 20px;
    }
    
    .header-top {
        margin-bottom: 15px;
    }
    
    .game-container {
        padding: 20px 15px;
    }
    
    .board {
        max-width: 300px;
        gap: 4px;
    }
    
    .row {
        gap: 4px;
    }
    
    .tile {
        font-size: 1.4rem;
        border-width: 1.5px;
    }
    
    .keyboard-row {
        gap: 3px;
    }
    
    .controls {
        flex-direction: column;
        gap: 10px;
    }
    
    .btn {
        width: 100%;
    }
    
    .modal-content {
        margin: 20% auto;
        width: 95%;
    }
    
    .stats-grid {
        gap: 10px;
    }
}

@media (max-width: 380px) {
    .tile {
        font-size: 1.2rem;
    }
    
    .key {
        min-width: 24px;
        padding: 10px;
        font-size: 0.7rem;
    }
    
    .key.wide {
        padding: 10px 12px;
        font-size: 0.65rem;
    }
}

/* Landscape mode for mobile */
@media (max-height: 600px) and (orientation: landscape) {
    body {
        align-items: flex-start;
        padding-top: 10px;
    }
    
    header h1 {
        font-size: 1.5rem;
        margin-bottom: 5px;
    }
    
    .subtitle {
        font-size: 0.8rem;
    }
    
    .game-container {
        padding: 15px;
    }
    
    .board {
        margin-bottom: 15px;
    }
    
    .keyboard {
        margin-bottom: 10px;
    }
}

/* Print styles */
@media print {
    .header-top,
    .controls,
    .keyboard,
    footer {
        display: none;
    }
}