:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --accent-primary: #3b82f6;
    --accent-secondary: #ef4444;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: rgba(0, 0, 0, 0.08);
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-blur: 12px;
    --success: #10b981;
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

/* --- Animated Background --- */
.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #f0f9ff 0%, #fef2f2 100%);
    z-index: -2;
}

.bg-orbs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    filter: blur(80px);
}

.orb {
    position: absolute;
    border-radius: 50%;
    opacity: 0.3;
    animation: orbMove 20s infinite alternate ease-in-out;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    top: -100px;
    left: -100px;
}

.orb-2 {
    width: 350px;
    height: 350px;
    background: linear-gradient(135deg, #f97316 0%, #ef4444 100%);
    bottom: -50px;
    right: -50px;
    animation-delay: -5s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #06b6d4 0%, #ec4899 100%);
    top: 40%;
    left: 60%;
    animation-delay: -10s;
}

@keyframes orbMove {
    0% {
        transform: translate(0, 0) scale(1);
    }

    100% {
        transform: translate(100px, 50px) scale(1.2);
    }
}

/* --- Layout --- */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 4rem 1.5rem;
    position: relative;
    z-index: 1;
}

.header {
    text-align: center;
    margin-bottom: 4rem;
    animation: fadeInUp 0.8s ease-out;
}

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

.logo-icon {
    width: 48px;
    height: 48px;
    color: var(--accent-primary);
    filter: drop-shadow(0 0 10px var(--accent-primary));
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #3b82f6 0%, #ef4444 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* --- Upload Section --- */
.upload-section {
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.upload-zone {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    border: 2px dashed var(--border-color);
    border-radius: 24px;
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(239, 68, 68, 0.1) 100%);
    opacity: 0;
    transition: var(--transition-smooth);
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.upload-zone:hover::before,
.upload-zone.drag-over::before {
    opacity: 1;
}

.upload-content {
    position: relative;
    z-index: 2;
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    color: var(--accent-primary);
    transition: var(--transition-smooth);
}

.upload-zone:hover .upload-icon {
    transform: translateY(-8px) scale(1.1);
}

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

.upload-highlight {
    color: var(--accent-primary);
}

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

/* --- Preview Section --- */
.preview-section {
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s ease-out;
}

.preview-section[hidden],
.metadata-section[hidden] {
    display: none !important;
}

.preview-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2rem;
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 2rem;
    align-items: center;
}

@media (max-width: 768px) {
    .preview-card {
        grid-template-columns: 1fr;
    }
}

.preview-media img,
.preview-media video {
    width: 100%;
    height: 200px;
    object-fit: contain;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.03);
}

.preview-filename {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    word-break: break-all;
}

.preview-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.meta-badge {
    background: rgba(59, 130, 246, 0.1);
    padding: 0.4rem 1rem;
    border-radius: 100px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

/* --- Metadata Tables --- */
.metadata-section {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.metadata-group {
    animation: fadeInUp 0.8s ease-out;
}

.group-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.group-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.group-icon {
    width: 24px;
    height: 24px;
    color: var(--accent-primary);
    flex-shrink: 0;
}

.table-wrapper {
    background: var(--bg-secondary);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.metadata-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.metadata-table th,
.metadata-table td {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.metadata-table th {
    background: rgba(59, 130, 246, 0.05);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    width: 35%;
}

.metadata-table tr:hover {
    background: rgba(59, 130, 246, 0.05);
}

.metadata-table tr:last-child th,
.metadata-table tr:last-child td {
    border-bottom: none;
}

.important-table td {
    color: var(--text-primary);
    font-weight: 500;
    position: relative;
}

.important-table td {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}

.metadata-value {
    flex: 1;
}

.copy-btn {
    background: rgba(59, 130, 246, 0.08);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.4rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.copy-btn svg {
    width: 16px;
    height: 16px;
}

.copy-btn:hover {
    background: rgba(59, 130, 246, 0.15);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: scale(1.1);
}

.copy-btn.copied {
    background: rgba(16, 185, 129, 0.2);
    border-color: var(--success);
    color: var(--success);
}

.important-table tr {
    transition: var(--transition-smooth);
}

.important-table tr:hover {
    transform: scale(1.005);
    background: linear-gradient(90deg, rgba(59, 130, 246, 0.08) 0%, rgba(239, 68, 68, 0.08) 100%);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast-error {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

/* --- Collapsible Support --- */
.collapsible {
    max-height: 10000px;
    transition: max-height 0.5s ease;
}

.collapsible.collapsed {
    max-height: 0;
}

.toggle-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 5px;
    display: flex;
    align-items: center;
    transition: var(--transition-smooth);
}

.toggle-btn svg {
    width: 24px;
    height: 24px;
}

.toggle-btn.collapsed {
    transform: rotate(-90deg);
}

/* --- Loading Overlay --- */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
}

.loading-overlay[hidden] {
    display: none;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* --- Footer --- */
.footer {
    margin-top: 6rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-privacy {
    margin-top: 0.5rem;
    color: var(--success);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.privacy-icon {
    width: 18px;
    height: 18px;
    color: var(--success);
}

/* --- Animations --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Overrides */
@media (max-width: 640px) {
    h1 {
        font-size: 1.8rem;
    }

    .container {
        padding-top: 2rem;
    }

    .upload-zone {
        padding: 3rem 1rem;
    }

    .metadata-table th,
    .metadata-table td {
        padding: 0.75rem 1rem;
    }
}