:root {
    --bg-color: #0f172a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Dynamic background gradients */
.background-anim {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.15), transparent 25%),
                radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.15), transparent 25%);
    z-index: -1;
    animation: pulseBg 10s infinite alternate;
}

@keyframes pulseBg {
    0% { transform: scale(1); }
    100% { transform: scale(1.1); }
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 0.5rem;
}

.highlight {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--card-shadow);
}

/* Upload Section */
.upload-section {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 2px dashed var(--glass-border);
    border-radius: 16px;
    padding: 4rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    margin-bottom: 3rem;
}

.upload-section:hover, .upload-section.dragover {
    border-color: var(--accent-color);
    background: rgba(59, 130, 246, 0.05);
}

.upload-content svg {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.upload-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.upload-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.btn.primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.hidden {
    display: none !important;
}

/* Loader */
.loader-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255,255,255,0.1);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    100% { transform: rotate(360deg); }
}

/* Results Section */
.section-title {
    margin: 3rem 0 1.5rem;
    font-size: 1.8rem;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 0.5rem;
}

.global-card h2 {
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    color: var(--accent-color);
}

.stats-row {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.stat-box {
    flex: 1;
    min-width: 120px;
    background: rgba(0,0,0,0.2);
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--glass-border);
    transition: transform 0.3s ease;
}

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

.stat-box .label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.stat-box .value {
    display: block;
    font-size: 2rem;
    font-weight: 800;
}

.audio-player {
    background: rgba(0,0,0,0.2);
    padding: 1rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
}

.audio-player p {
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-secondary);
}

audio {
    width: 100%;
    height: 40px;
    outline: none;
    border-radius: 8px;
}

/* Parts Grid */
.parts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.part-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
}

.part-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow);
    border-color: rgba(255,255,255,0.2);
}

.part-card h4 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.part-badge {
    background: var(--accent-color);
    color: white;
    font-size: 0.8rem;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
}

.part-stats {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.part-stats span {
    background: rgba(0,0,0,0.2);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    border: 1px solid var(--glass-border);
}

/* Instrument Tags */
.instruments-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.instrument-tag {
    background: rgba(139, 92, 246, 0.2);
    color: #c4b5fd;
    border: 1px solid rgba(139, 92, 246, 0.4);
    font-size: 0.8rem;
    padding: 0.2rem 0.6rem;
    border-radius: 16px;
    font-weight: 600;
}

@media (max-width: 768px) {
    .stats-row {
        flex-direction: column;
    }
    header h1 {
        font-size: 2.5rem;
    }
}