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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: #121213;
    color: #ffffff;
    min-height: 100vh;
}

header {
    background-color: #1a1a1b;
    padding: 1rem 0;
    border-bottom: 1px solid #3a3a3c;
}

h1 {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #ffffff;
}

nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.nav-btn {
    background: none;
    border: 2px solid #3a3a3c;
    color: #ffffff;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.nav-btn:hover {
    border-color: #565758;
}

.nav-btn.active {
    background-color: #538d4e;
    border-color: #538d4e;
}

.nav-btn.game-action-nav {
    background-color: #565758;
    border-color: #565758;
}

.nav-btn.game-action-nav:hover {
    background-color: #818384;
    border-color: #818384;
}

.nav-btn.game-action-nav:disabled {
    background-color: #3a3a3c;
    border-color: #3a3a3c;
    opacity: 0.6;
    cursor: not-allowed;
}

main {
    max-width: 500px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.section {
    display: none;
}

.section.active {
    display: block;
}

/* Game Section */
.game-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.word-set-selector {
    width: 100%;
    text-align: center;
}

#word-set-select {
    background-color: #1a1a1b;
    color: #ffffff;
    border: 2px solid #3a3a3c;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-size: 1rem;
    width: 100%;
    max-width: 300px;
}

.game-info {
    margin-top: 0.5rem;
    color: #818384;
    font-size: 0.9rem;
}

.game-board {
    display: grid;
    gap: 0.25rem;
    margin: 1rem 0;
    width: 100%;
}

.game-row {
    display: flex;
    gap: 0.25rem;
    justify-content: center;
    width: 100%;
}

.game-cell {
    flex: 1;
    aspect-ratio: 1;
    border: 2px solid #3a3a3c;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    text-transform: uppercase;
    background-color: #121213;
    color: #ffffff;
    max-width: 4rem;
}

.game-cell.filled {
    border-color: #565758;
}

.game-cell.correct {
    background-color: #538d4e;
    border-color: #538d4e;
}

.game-cell.present {
    background-color: #b59f3b;
    border-color: #b59f3b;
}

.game-cell.absent {
    background-color: #3a3a3c;
    border-color: #3a3a3c;
}

.game-cell.hint {
    background-color: #b59f3b;
    border-color: #b59f3b;
}

.no-game-message {
    color: #818384;
    font-size: 1.2rem;
    text-align: center;
    padding: 2rem;
    grid-column: 1 / -1;
}

/* Keyboard */
.keyboard {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    width: 100%;
}

.keyboard-row {
    display: flex;
    gap: 0.25rem;
    justify-content: center;
}

.key {
    min-width: 2.5rem;
    height: 3rem;
    border: none;
    border-radius: 4px;
    background-color: #818384;
    color: #ffffff;
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.key:hover {
    background-color: #565758;
}

.key-large {
    min-width: 4rem;
    font-size: 0.7rem;
}

.key.correct {
    background-color: #538d4e;
}

.key.present {
    background-color: #b59f3b;
}

.key.absent {
    background-color: #3a3a3c;
}

.game-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin: 1rem 0;
}

.action-btn {
    background-color: #565758;
    color: #ffffff;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.action-btn:hover {
    background-color: #818384;
}

.action-btn:disabled {
    background-color: #3a3a3c;
    cursor: not-allowed;
    opacity: 0.6;
}

.game-message {
    text-align: center;
    font-size: 1.1rem;
    font-weight: 600;
    min-height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.game-message.win {
    color: #538d4e;
}

.game-message.lose {
    color: #f5793a;
}

.game-message.hint {
    color: #b59f3b;
}

/* Create Section */
.create-container {
    max-width: 400px;
    margin: 0 auto;
}

.create-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: #ffffff;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #ffffff;
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #3a3a3c;
    border-radius: 4px;
    background-color: #1a1a1b;
    color: #ffffff;
    font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #565758;
}

.submit-btn {
    width: 100%;
    padding: 1rem;
    background-color: #538d4e;
    color: #ffffff;
    border: none;
    border-radius: 4px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.submit-btn:hover {
    background-color: #4a7c59;
}

/* Browse Section */
.browse-container {
    max-width: 600px;
    margin: 0 auto;
}

.browse-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: #ffffff;
}

.word-sets-list {
    display: grid;
    gap: 1rem;
}

.word-set-item {
    background-color: #1a1a1b;
    border: 2px solid #3a3a3c;
    border-radius: 8px;
    padding: 1.5rem;
    cursor: pointer;
    transition: border-color 0.2s ease;
}

.word-set-item:hover {
    border-color: #565758;
}

.word-set-name {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #ffffff;
}

.word-set-details {
    color: #818384;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    main {
        padding: 1rem 0.5rem;
    }
    
    .game-cell {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1.2rem;
    }
    
    .key {
        min-width: 2rem;
        height: 2.5rem;
        font-size: 0.8rem;
    }
    
    .key-large {
        min-width: 3rem;
        font-size: 0.6rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    nav {
        flex-direction: column;
        align-items: center;
    }
    
    .nav-btn {
        width: 200px;
    }
    
    .nav-btn.game-action-nav {
        width: 150px;
    }
}

@media (max-width: 480px) {
    .game-cell {
        width: 2rem;
        height: 2rem;
        font-size: 1rem;
    }
    
    .key {
        min-width: 1.8rem;
        height: 2.2rem;
        font-size: 0.7rem;
    }
    
    .key-large {
        min-width: 2.5rem;
        font-size: 0.5rem;
    }
    
    .game-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .action-btn {
        width: 120px;
        font-size: 0.8rem;
    }
}