:root {
    --bg-color: #1a1a2e;
    --card-bg: #16213e;
    --accent: #e94560;
    --accent-glow: rgba(233, 69, 96, 0.4);
    --text-primary: #eaeaea;
    --text-secondary: #a0a0a0;
    --slider-track: #0f3460;
    --pendulum-color: #e94560;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-color) 0%, #0f0f23 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-primary);
}

.container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.metronome {
    background: var(--card-bg);
    border-radius: 24px;
    padding: 40px 30px;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 255, 255, 0.05);
    text-align: center;
}

h1 {
    font-size: 1.8rem;
    margin-bottom: 30px;
    font-weight: 300;
    letter-spacing: 2px;
}

.display {
    margin-bottom: 25px;
}

#bpm-display {
    font-size: 5rem;
    font-weight: 200;
    line-height: 1;
    color: var(--accent);
    text-shadow: 0 0 30px var(--accent-glow);
}

.bpm-label {
    display: block;
    font-size: 1rem;
    color: var(--text-secondary);
    letter-spacing: 4px;
    margin-top: 5px;
}

.slider-container {
    margin-bottom: 30px;
}

#bpm-slider {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--slider-track);
    border-radius: 4px;
    outline: none;
    cursor: pointer;
}

#bpm-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 15px var(--accent-glow);
    transition: transform 0.2s, box-shadow 0.2s;
}

#bpm-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 0 25px var(--accent-glow);
}

#bpm-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 0 15px var(--accent-glow);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 8px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.pendulum-container {
    margin-bottom: 30px;
}

.pendulum-track {
    width: 100%;
    height: 4px;
    background: var(--slider-track);
    border-radius: 2px;
    position: relative;
    margin-bottom: 20px;
}

.pendulum {
    width: 20px;
    height: 20px;
    background: var(--pendulum-color);
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 20px var(--accent-glow);
    transition: left 0.1s linear;
}

.beat-indicator {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.beat-dot {
    width: 16px;
    height: 16px;
    background: var(--slider-track);
    border-radius: 50%;
    transition: all 0.1s;
}

.beat-dot.active {
    background: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow);
    transform: scale(1.3);
}

.controls {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-bottom: 20px;
}

.btn {
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary {
    width: 70px;
    height: 70px;
    background: var(--accent);
    color: white;
    font-size: 1.5rem;
    border-radius: 50%;
    box-shadow: 0 5px 20px var(--accent-glow);
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 30px var(--accent-glow);
}

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

.btn-primary.playing {
    background: #ff6b6b;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 5px 20px var(--accent-glow); }
    50% { box-shadow: 0 5px 40px var(--accent-glow); }
}

.btn-secondary {
    padding: 20px 30px;
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--slider-track);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-secondary:active {
    background: rgba(233, 69, 96, 0.1);
}

.tempo-markings {
    font-size: 0.9rem;
    color: var(--text-secondary);
    letter-spacing: 2px;
}

#tempo-name {
    font-style: italic;
}

@media (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    .metronome {
        padding: 30px 20px;
    }
    
    #bpm-display {
        font-size: 4rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
}