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

body {
    font-family: 'Inter', sans-serif;
    background-color: #1E1E1E;
    color: #F0F0F0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

#app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    width: 100%;
}

header {
    background-color: #2B2B2B;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

h1 {
    font-size: 28px;
    font-weight: 700;
    color: #F0D9B5;
}

.header-stats {
    display: flex;
    gap: 20px;
    font-size: 16px;
    color: #A0A0A0;
}

main {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 30px;
    align-items: start;
}

.puzzle-info {
    background-color: #2B2B2B;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    grid-column: 1 / -1;
}

.objective {
    font-size: 24px;
    font-weight: 700;
    color: #769656;
    margin-bottom: 10px;
}

.meta-info {
    display: flex;
    gap: 30px;
    font-size: 16px;
    color: #A0A0A0;
}

.timer {
    font-family: 'Fira Code', monospace;
    color: #F0F0F0;
    font-size: 18px;
}

.board-container {
    grid-column: 1;
}

.board-wrapper {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.rank-labels {
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    font-size: 14px;
    color: #A0A0A0;
    padding: 10px 0;
}

#chessboard {
    border: 3px solid #2B2B2B;
    border-radius: 4px;
    cursor: pointer;
    max-width: 100%;
    height: auto;
}

.file-labels {
    display: flex;
    justify-content: space-around;
    font-size: 14px;
    color: #A0A0A0;
    padding: 10px 0;
}

.controls {
    display: flex;
    gap: 15px;
    margin: 20px 0;
    flex-wrap: wrap;
    grid-column: 1 / -1;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-family: 'Inter', sans-serif;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

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

.btn-hint {
    background-color: transparent;
    border: 2px solid #769656;
    color: #769656;
}

.btn-hint:hover {
    background-color: rgba(118, 150, 86, 0.1);
}

.btn-secondary {
    background-color: #3A3A3A;
    color: #F0F0F0;
}

.btn-secondary:hover {
    background-color: #4A4A4A;
}

.btn-primary {
    background-color: #769656;
    color: #FFFFFF;
}

.btn-primary:hover {
    background-color: #648547;
}

.btn-danger {
    background-color: transparent;
    border: 2px solid #CC3333;
    color: #CC3333;
}

.btn-danger:hover {
    background-color: rgba(204, 51, 51, 0.1);
}

.feedback {
    padding: 15px;
    border-radius: 6px;
    font-weight: 600;
    margin: 15px 0;
    display: none;
    grid-column: 1 / -1;
}

.feedback.success {
    background-color: rgba(129, 182, 76, 0.2);
    color: #81B64C;
    border: 2px solid #81B64C;
}

.feedback.error {
    background-color: rgba(204, 51, 51, 0.2);
    color: #CC3333;
    border: 2px solid #CC3333;
}

.feedback.hint {
    background-color: rgba(255, 193, 7, 0.2);
    color: #FFC107;
    border: 2px solid #FFC107;
}

.pattern-name {
    font-size: 18px;
    font-style: italic;
    color: #769656;
    margin: 10px 0;
    grid-column: 1 / -1;
}

.stats-card {
    background-color: #2B2B2B;
    padding: 20px;
    border-radius: 8px;
    grid-column: 2;
    grid-row: 2 / 5;
    min-width: 250px;
}

.stats-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #F0D9B5;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid #3A3A3A;
    font-size: 16px;
}

.stat-row.highlight {
    color: #769656;
    font-weight: 600;
}

footer {
    text-align: center;
    padding: 30px 20px;
    color: #A0A0A0;
    margin-top: auto;
    grid-column: 1 / -1;
}

footer a {
    color: #769656;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }
    
    .stats-card {
        grid-column: 1;
        grid-row: auto;
    }
    
    h1 {
        font-size: 22px;
    }
    
    .objective {
        font-size: 20px;
    }
    
    .controls {
        justify-content: center;
    }
    
    .btn {
        flex: 1;
        min-width: 120px;
    }
}

@media (max-width: 480px) {
    #app-container {
        padding: 10px;
    }
    
    h1 {
        font-size: 18px;
    }
    
    .header-stats {
        flex-direction: column;
        gap: 5px;
    }
    
    .objective {
        font-size: 18px;
    }
    
    .meta-info {
        flex-direction: column;
        gap: 5px;
    }
}