frontend/css/styles.css

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --secondary: #8b5cf6;
    --accent: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    --bg-dark: #0f172a;
    --bg-medium: #1e293b;
    --bg-light: #334155;
    
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Background Animation */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    overflow: hidden;
}

.background-animation::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15), transparent 70%);
    border-radius: 50%;
    top: -250px;
    right: -250px;
    animation: float 20s ease-in-out infinite;
}

.background-animation::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.15), transparent 70%);
    border-radius: 50%;
    bottom: -200px;
    left: -200px;
    animation: float 15s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.header {
    padding: 2rem 0;
    border-bottom: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15, 23, 42, 0.8);
}

.header-content {
    text-align: center;
}

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
    margin-bottom: 0.5rem;
}

.icon {
    font-size: 2rem;
    display: inline-block;
    animation: dance 2s ease-in-out infinite;
}

@keyframes dance {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(-10deg); }
    75% { transform: rotate(10deg); }
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Main Content */
.main-content {
    padding: 3rem 0;
    min-height: calc(100vh - 200px);
}

/* Glass Card */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 1.5rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.card-header {
    margin-bottom: 1.5rem;
    text-align: center;
}

.card-header h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.card-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--glass-border);
    border-radius: 1rem;
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.upload-zone:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.upload-zone.drag-over {
    border-color: var(--accent);
    background: rgba(236, 72, 153, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.upload-text {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.upload-subtext {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.upload-specs {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* File Info */
.file-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 0.75rem;
    margin-top: 1rem;
}

.file-details {
    flex: 1;
}

.file-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.file-meta {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary);
}

.btn-download {
    background: linear-gradient(135deg, var(--success), #059669);
    color: white;
    margin-top: 1rem;
    width: 100%;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

/* Progress */
.progress-container {
    margin: 2rem 0;
}

.progress-bar {
    height: 1rem;
    background: var(--bg-light);
    border-radius: 0.5rem;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 0.5rem;
    width: 0%;
    transition: width 0.3s ease;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-text {
    text-align: center;
    margin-top: 0.5rem;
    font-weight: 600;
    color: var(--primary);
}

.processing-stats {
    display: flex;
    justify-content: space-around;
    margin-top: 1.5rem;
}

.stat-item {
    text-align: center;
}

.stat-label {
    display: block;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

.stat-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.video-container {
    text-align: center;
}

.video-container h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.video-container video {
    width: 100%;
    border-radius: 0.75rem;
    background: var(--bg-medium);
    box-shadow: var(--shadow-md);
}

/* Metrics Grid */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.metric-card {
    padding: 1.5rem;
    text-align: center;
}

.metric-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.metric-icon {
    font-size: 2rem;
}

.metric-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.metric-value {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.metric-subvalue {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Intensity Bar */
.intensity-bar {
    height: 0.5rem;
    background: var(--bg-light);
    border-radius: 0.25rem;
    overflow: hidden;
    margin-top: 0.75rem;
}

.intensity-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--success), var(--warning), var(--error));
    border-radius: 0.25rem;
    width: 0%;
    transition: width 0.6s ease;
}

/* Body Parts */
.body-parts {
    display: grid;
    gap: 1rem;
}

.body-part-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.body-part-name {
    min-width: 120px;
    font-weight: 600;
    text-transform: capitalize;
}

.body-part-bar {
    flex: 1;
    height: 2rem;
    background: var(--bg-light);
    border-radius: 0.5rem;
    overflow: hidden;
    position: relative;
}

.body-part-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 0.75rem;
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    transition: width 0.6s ease;
}

/* Rhythm Info */
.rhythm-info {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 2rem;
}

.rhythm-item {
    text-align: center;
}

.rhythm-label {
    display: block;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.rhythm-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

/* Footer */
.footer {
    border-top: 1px solid var(--glass-border);
    padding: 2rem 0;
    text-align: center;
    backdrop-filter: blur(10px);
    background: rgba(15, 23, 42, 0.8);
}

.footer p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--accent);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 0.75rem;
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(200%);
    transition: transform 0.3s ease;
    z-index: 1000;
    max-width: 400px;
}

.toast.show {
    transform: translateY(0);
}

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left: 4px solid var(--error);
}

.toast.info {
    border-left: 4px solid var(--primary);
}

/* Responsive */
@media (max-width: 768px) {
    .logo {
        font-size: 1.75rem;
    }
    
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    .metrics-grid {
        grid-template-columns: 1fr;
    }
    
    .file-info {
        flex-direction: column;
        gap: 1rem;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

/* Loading Animation */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading {
    animation: pulse 2s ease-in-out infinite;
}