/* CSS Reset & Variables */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-primary: #0a0a0a;
    --bg-card: #141414;
    --bg-card-hover: #1a1a1a;
    --border-color: #262626;
    --border-hover: #404040;
    --text-primary: #fafafa;
    --text-secondary: #a1a1a1;
    --text-muted: #737373;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-glow: rgba(59, 130, 246, 0.15);
    --success: #22c55e;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --transition: 0.2s ease;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

/* Container */
.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 0.5rem;
}

/* Bento Grid */
.bento-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto auto;
    gap: 1rem;
    flex: 1;
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    transition: border-color var(--transition), background var(--transition);
}

.card:hover {
    border-color: var(--border-hover);
}

.card-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

/* Drop Zone Card */
.card-drop {
    grid-column: 1 / -1;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.card-drop.drag-over {
    border-color: var(--accent);
    background: var(--accent-glow);
}

.drop-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    transition: transform var(--transition);
}

.card-drop:hover .drop-content {
    transform: scale(1.02);
}

.drop-icon {
    color: var(--text-muted);
    transition: color var(--transition);
}

.card-drop:hover .drop-icon {
    color: var(--accent);
}

.drop-text {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
}

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

/* Video Preview */
.video-preview {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    padding: 1rem;
}

.video-preview video {
    max-width: 100%;
    max-height: 100%;
    border-radius: var(--radius-md);
    object-fit: contain;
}

.remove-btn {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.7);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.remove-btn:hover {
    background: rgba(239, 68, 68, 0.8);
    border-color: transparent;
}

/* Settings Card */
.card-settings {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.setting-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.setting-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.setting-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.quality-options {
    display: flex;
    gap: 0.5rem;
}

.quality-btn {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

.quality-btn:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.quality-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.select-input {
    width: 100%;
    padding: 0.6rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: border-color var(--transition);
}

.select-input:hover {
    border-color: var(--border-hover);
}

.select-input:focus {
    outline: none;
    border-color: var(--accent);
}

/* Info Card */
.card-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 0.75rem;
}

.info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.info-value {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}

.info-row.highlight .info-value {
    color: var(--success);
}

/* Action Card */
.card-action {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-primary:disabled {
    background: var(--border-color);
    color: var(--text-muted);
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--success);
    color: white;
}

.btn-secondary:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

/* Progress */
.progress-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

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

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

.progress-percent {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
}

.progress-bar {
    height: 6px;
    background: var(--bg-primary);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent) 0%, #60a5fa 100%);
    border-radius: 3px;
    transition: width 0.1s ease-out;
}

/* Footer */
.footer {
    text-align: center;
    padding-top: 2rem;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.footer a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition);
}

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

/* Hidden utility */
[hidden] {
    display: none !important;
}

/* Responsive */
@media (max-width: 600px) {
    .container {
        padding: 1.5rem 1rem;
    }

    .bento-grid {
        grid-template-columns: 1fr;
    }

    .card-drop {
        min-height: 180px;
    }

    .logo {
        font-size: 1.75rem;
    }

    .quality-btn {
        padding: 0.4rem 0.5rem;
        font-size: 0.75rem;
    }
}

/* Animations */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.processing .progress-label {
    animation: pulse 1.5s ease-in-out infinite;
}