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

:root {
    --primary: #667eea;
    --primary-dark: #5568d3;
    --success: #48bb78;
    --danger: #f56565;
    --warning: #ed8936;
    --light: #f7fafc;
    --dark: #2d3748;
    --border: #e2e8f0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--dark);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 900px;
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px 20px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

header .subtitle {
    font-size: 1.1em;
    opacity: 0.9;
}

/* Screen Management */
.screen {
    display: none;
    animation: fadeIn 0.3s ease-in;
}

.screen.active {
    display: block;
}

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

/* Start Screen */
.start-content {
    padding: 40px;
    text-align: center;
}

.start-content h2 {
    font-size: 2em;
    margin-bottom: 20px;
    color: var(--primary);
}

.start-content p {
    font-size: 1.1em;
    color: #718096;
    margin-bottom: 30px;
}

.game-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
    padding: 20px;
    background: var(--light);
    border-radius: 8px;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.info-label {
    font-weight: 600;
    color: var(--dark);
}

.info-value {
    font-size: 1.2em;
    color: var(--primary);
    font-weight: bold;
}

/* Game Screen */
.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: var(--light);
    border-bottom: 2px solid var(--border);
    flex-wrap: wrap;
    gap: 15px;
}

.score-box,
.streak-box {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
}

.score-label,
.streak-label {
    color: #718096;
}

.score-value,
.streak-value {
    font-size: 1.5em;
    color: var(--primary);
    font-weight: bold;
}

.round-info {
    color: var(--dark);
    font-weight: 600;
    font-size: 1.1em;
}

/* Progress Bar */
.progress-container {
    width: 100%;
    height: 8px;
    background: var(--border);
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--success));
    width: 0%;
    transition: width 0.3s ease;
}

/* Game Content */
.game-content {
    padding: 40px;
}

.category {
    display: inline-block;
    padding: 6px 12px;
    background: var(--primary);
    color: white;
    border-radius: 20px;
    font-size: 0.85em;
    font-weight: 600;
    margin-bottom: 15px;
}

.description {
    font-size: 1.1em;
    color: #718096;
    margin-bottom: 30px;
    font-style: italic;
}

.sequence-box {
    background: var(--light);
    border: 2px solid var(--primary);
    border-radius: 8px;
    padding: 30px;
    margin-bottom: 30px;
    text-align: center;
}

.sequence {
    font-size: 1.8em;
    font-family: 'Courier New', monospace;
    font-weight: bold;
    color: var(--dark);
    letter-spacing: 2px;
    word-break: break-all;
}

/* Input Group */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.input-group label {
    font-weight: 600;
    color: var(--dark);
}

.answer-input {
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1.1em;
    font-family: 'Courier New', monospace;
    transition: all 0.3s ease;
}

.answer-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

.btn-submit {
    background: var(--success);
    color: white;
    width: 100%;
}

.btn-submit:hover {
    background: #38a169;
    transform: translateY(-2px);
}

.btn-submit:disabled {
    background: #cbd5e0;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--warning);
    color: white;
    width: 100%;
    margin-top: 10px;
}

.btn-secondary:hover {
    background: #dd6b20;
    transform: translateY(-2px);
}

/* Feedback */
.feedback {
    min-height: 40px;
    padding: 15px;
    border-radius: 8px;
    font-weight: 600;
    margin-bottom: 20px;
    display: none;
    text-align: center;
}

.feedback.correct {
    display: block;
    background: #c6f6d5;
    color: #22543d;
    border: 2px solid var(--success);
}

.feedback.incorrect {
    display: block;
    background: #fed7d7;
    color: #742a2a;
    border: 2px solid var(--danger);
}

.feedback.skipped {
    display: block;
    background: #fef3c7;
    color: #78350f;
    border: 2px solid var(--warning);
}

/* Game Over Screen */
.game-over-content {
    padding: 40px;
    text-align: center;
}

.game-over-content h2 {
    font-size: 2.5em;
    margin-bottom: 30px;
    color: var(--primary);
}

.final-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat {
    background: var(--light);
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid var(--primary);
}

.stat-label {
    display: block;
    color: #718096;
    font-size: 0.9em;
    margin-bottom: 8px;
}

.stat-value {
    display: block;
    font-size: 2em;
    font-weight: bold;
    color: var(--primary);
}

.score-message {
    font-size: 1.3em;
    margin-bottom: 30px;
    padding: 15px;
    border-radius: 8px;
    font-weight: 600;
}

.score-message.excellent {
    background: #c6f6d5;
    color: #22543d;
}

.score-message.good {
    background: #bee3f8;
    color: #2c5282;
}

.score-message.decent {
    background: #feebc8;
    color: #7c2d12;
}

.score-message.needs-work {
    background: #fed7d7;
    color: #742a2a;
}

.results-breakdown {
    text-align: left;
    background: var(--light);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
}

.results-breakdown h3 {
    margin-bottom: 15px;
    color: var(--dark);
}

.category-results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 10px;
}

.category-result {
    background: white;
    padding: 10px;
    border-radius: 6px;
    border-left: 3px solid var(--border);
}

.category-result.success {
    border-left-color: var(--success);
}

.category-result.partial {
    border-left-color: var(--warning);
}

.category-result.poor {
    border-left-color: var(--danger);
}

.category-result-name {
    font-weight: 600;
    font-size: 0.9em;
    color: var(--dark);
}

.category-result-score {
    font-size: 1.2em;
    margin-top: 5px;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8em;
    }

    .start-content,
    .game-content,
    .game-over-content {
        padding: 20px;
    }

    .sequence {
        font-size: 1.4em;
    }

    .game-header {
        flex-direction: column;
        text-align: center;
    }

    .final-stats,
    .game-info {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        border-radius: 0;
    }

    header {
        padding: 20px;
    }

    header h1 {
        font-size: 1.5em;
    }

    .sequence-box {
        padding: 15px;
    }

    .sequence {
        font-size: 1.2em;
    }

    .start-content,
    .game-content,
    .game-over-content {
        padding: 15px;
    }

    .final-stats,
    .game-info {
        grid-template-columns: 1fr;
    }
}