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

:root {
    --primary-color: #ff3366;
    --secondary-color: #6c5ce7;
    --accent-color: #00d4ff;
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-card: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #b8b8b8;
    --border-color: #404040;
    --success-color: #00ff88;
    --warning-color: #ffaa00;
    --error-color: #ff4757;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    background-image: 
        radial-gradient(circle at 20% 20%, rgba(255, 51, 102, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(108, 92, 231, 0.1) 0%, transparent 50%);
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px 0;
}

.logo {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo-icon {
    font-size: 3.5rem;
    -webkit-text-fill-color: var(--accent-color);
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 300;
}

.mixer-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 40px;
    margin-bottom: 40px;
}

.current-track {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 30px;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    text-align: center;
    min-width: 400px;
}

.current-track h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--text-primary);
    font-weight: 600;
}

.key-selection {
    display: flex;
    justify-content: center;
}

.key-select {
    padding: 15px 20px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1.1rem;
    min-width: 200px;
    transition: all 0.3s ease;
}

.key-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 51, 102, 0.1);
}

.deck {
    display: none;
}

.track-input {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.track-name {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.track-name:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 51, 102, 0.1);
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-group label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.bpm-input {
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.bpm-input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.1);
}

.compatible-keys-section {
    margin-bottom: 40px;
}

.compatible-keys-display {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 30px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: flex-start;
    gap: 20px;
    transition: all 0.3s ease;
}

.compatible-keys-display.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 30px rgba(255, 51, 102, 0.1);
}

.keys-icon {
    font-size: 3rem;
    opacity: 0.7;
    flex-shrink: 0;
}

.keys-text {
    flex: 1;
}

.keys-text h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.key-groups {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.key-group {
    background: var(--bg-secondary);
    padding: 15px;
    border-radius: 10px;
    border-left: 4px solid var(--border-color);
}

.key-group.perfect {
    border-left-color: var(--success-color);
}

.key-group.good {
    border-left-color: var(--warning-color);
}

.key-group.acceptable {
    border-left-color: var(--accent-color);
}

.key-group h4 {
    font-size: 1rem;
    margin-bottom: 5px;
    color: var(--text-primary);
}

.key-group p {
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

.compatibility-section {
    margin-bottom: 40px;
}

.compatibility-result {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 30px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: all 0.3s ease;
}

.result-icon {
    font-size: 3rem;
    opacity: 0.7;
}

.result-text h3 {
    font-size: 1.3rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.result-text p {
    color: var(--text-secondary);
    line-height: 1.5;
}

.compatibility-result.perfect {
    border-color: var(--success-color);
    background: linear-gradient(135deg, var(--bg-card), rgba(0, 255, 136, 0.05));
}

.compatibility-result.good {
    border-color: var(--warning-color);
    background: linear-gradient(135deg, var(--bg-card), rgba(255, 170, 0, 0.05));
}

.compatibility-result.poor {
    border-color: var(--error-color);
    background: linear-gradient(135deg, var(--bg-card), rgba(255, 71, 87, 0.05));
}

.mixing-tips {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 30px;
    border: 1px solid var(--border-color);
}

.mixing-tips h3 {
    font-size: 1.5rem;
    margin-bottom: 25px;
    color: var(--text-primary);
    text-align: center;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.tip {
    background: var(--bg-secondary);
    border-radius: 15px;
    padding: 20px;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: transform 0.3s ease;
}

.tip:hover {
    transform: translateY(-5px);
}

.tip-icon {
    font-size: 2rem;
    margin-bottom: 10px;
}

.tip h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.tip p {
    color: var(--text-secondary);
    line-height: 1.5;
    font-size: 0.95rem;
}

@media (max-width: 1024px) {
    .mixer-section {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .app-container {
        padding: 20px;
    }
    
    .logo {
        font-size: 2.5rem;
    }
    
    .current-track {
        min-width: auto;
        padding: 20px;
    }
}

@media (max-width: 768px) {
    .app-container {
        padding: 15px;
    }
    
    .logo {
        font-size: 2.5rem;
    }
    
    .current-track {
        min-width: auto;
        padding: 20px;
    }
}