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

:root {
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--bg-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    min-height: calc(100vh - 40px);
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 1rem;
    opacity: 0.9;
    font-weight: 400;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 40px 30px;
}

/* Upload Section */
.upload-section {
    margin-bottom: 40px;
}

.drop-zone {
    background: var(--card-bg);
    border: 3px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 60px 40px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.upload-icon {
    color: var(--primary-color);
    margin-bottom: 20px;
}

.drop-zone h2 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-weight: 600;
}

.drop-zone p {
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.file-size-hint {
    font-size: 0.85rem;
    opacity: 0.7;
}

/* Buttons */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border: none;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 20px;
    box-shadow: var(--shadow-md);
}

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

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

/* Upload Progress */
.upload-progress {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 30px;
    box-shadow: var(--shadow-md);
    margin-top: 30px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.progress-header span {
    font-weight: 600;
    color: var(--text-primary);
}

#progressPercent {
    color: var(--primary-color);
    font-size: 1.25rem;
}

.progress-bar {
    height: 12px;
    background: var(--border-color);
    border-radius: 20px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 20px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-status {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: center;
}

/* Files List */
.files-list {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow-md);
}

.files-list h3 {
    font-size: 1.5rem;
    margin-bottom: 25px;
    color: var(--text-primary);
    font-weight: 600;
}

.files-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

/* File Card */
.file-card {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all 0.3s ease;
    cursor: pointer;
}

.file-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.file-thumbnail {
    width: 100%;
    height: 180px;
    object-fit: cover;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.file-thumbnail img,
.file-thumbnail video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.file-icon {
    color: var(--primary-color);
    opacity: 0.5;
}

.file-info {
    padding: 15px;
}

.file-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.file-status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 500;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.status-badge.processing {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.status-badge.completed {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.status-badge.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
}

.status-dot-small {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

.status-badge.processing .status-dot-small {
    background: var(--warning-color);
}

.status-badge.completed .status-dot-small {
    background: var(--success-color);
    animation: none;
}

.status-badge.error .status-dot-small {
    background: var(--error-color);
    animation: none;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal-content {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    max-width: 90%;
    max-height: 90%;
    overflow: auto;
    position: relative;
    padding: 20px;
    box-shadow: var(--shadow-xl);
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: rgba(0, 0, 0, 0.5);
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 10;
}

.modal-close:hover {
    background: rgba(0, 0, 0, 0.7);
    transform: rotate(90deg);
}

.preview-content img,
.preview-content video {
    max-width: 100%;
    max-height: 80vh;
    border-radius: var(--radius-md);
}

/* Notifications */
.notifications {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.notification {
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    box-shadow: var(--shadow-xl);
    min-width: 300px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideIn 0.3s ease;
    border-left: 4px solid;
}

.notification.success {
    border-color: var(--success-color);
}

.notification.error {
    border-color: var(--error-color);
}

.notification.info {
    border-color: var(--primary-color);
}

.notification-icon {
    flex-shrink: 0;
}

.notification-content {
    flex: 1;
}

.notification-title {
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.notification-message {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Footer */
.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 25px 30px;
    text-align: center;
    color: var(--text-secondary);
}

.footer p {
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.status-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.85rem;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-secondary);
}

.status-dot.connected {
    background: var(--success-color);
    animation: pulse 2s ease-in-out infinite;
}

.status-dot.disconnected {
    background: var(--error-color);
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .container {
        border-radius: var(--radius-md);
        min-height: calc(100vh - 20px);
    }

    .header {
        padding: 30px 20px;
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    .main-content {
        padding: 30px 20px;
    }

    .drop-zone {
        padding: 40px 20px;
    }

    .drop-zone h2 {
        font-size: 1.25rem;
    }

    .files-container {
        grid-template-columns: 1fr;
    }

    .notifications {
        left: 10px;
        right: 10px;
    }

    .notification {
        min-width: auto;
    }

    .modal-content {
        max-width: 95%;
    }
}

/* Loading Animation */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}