:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --accent: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.3);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --border: rgba(255, 255, 255, 0.08);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
}

.container {
    width: 100%;
    max-width: 800px;
}

header {
    text-align: center;
    margin-bottom: 2.5rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent) 0%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

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

.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.input-field,
.select-field,
.textarea-field {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: all 0.2s ease;
}

.input-field:focus,
.select-field:focus,
.textarea-field:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.select-field {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1rem;
    padding-right: 2.5rem;
}

.select-field option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.textarea-field {
    resize: vertical;
    min-height: 80px;
}

.model-row {
    margin-top: 1rem;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.settings-grid label span,
.instruction-section label span {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.instruction-section {
    margin-top: 1rem;
}

.drop-zone {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-tertiary);
}

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

.drop-zone svg {
    width: 48px;
    height: 48px;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

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

.drop-zone .filename {
    color: var(--accent);
    font-weight: 600;
}

.hidden {
    display: none !important;
}

.btn {
    width: 100%;
    padding: 1rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, #8b5cf6 100%);
    color: white;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, #16a34a 100%);
    color: white;
    margin-top: 1.5rem;
}

.btn-success:hover {
    transform: translateY(-2px);
}

.progress-section {
    margin-top: 1.5rem;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

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

.progress-percentage {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent);
}

.progress-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent) 0%, #a855f7 100%);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

.chunks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
    gap: 0.5rem;
    margin-top: 1rem;
}

.chunk-indicator {
    aspect-ratio: 1;
    border-radius: 6px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.chunk-indicator.pending {
    background: var(--bg-tertiary);
}

.chunk-indicator.processing {
    background: rgba(245, 158, 11, 0.2);
    border-color: var(--warning);
    color: var(--warning);
    animation: pulse 1.5s infinite;
}

.chunk-indicator.done {
    background: rgba(34, 197, 94, 0.2);
    border-color: var(--success);
    color: var(--success);
}

.chunk-indicator.error {
    background: rgba(239, 68, 68, 0.2);
    border-color: var(--error);
    color: var(--error);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 1rem;
}

.stat {
    background: var(--bg-tertiary);
    padding: 1rem;
    border-radius: 10px;
    text-align: center;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.25rem;
}

.log-container {
    max-height: 200px;
    overflow-y: auto;
    background: var(--bg-tertiary);
    border-radius: 10px;
    padding: 1rem;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.8rem;
    margin-top: 1rem;
}

.log-entry {
    padding: 0.25rem 0;
    border-bottom: 1px solid var(--border);
}

.log-entry:last-child {
    border-bottom: none;
}

.log-time {
    color: var(--text-secondary);
    margin-right: 0.5rem;
}

.log-success { color: var(--success); }
.log-error { color: var(--error); }
.log-info { color: var(--accent); }

/* Responsive */
@media (max-width: 640px) {
    body {
        padding: 1rem;
    }

    h1 {
        font-size: 1.75rem;
    }

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

    .stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.5rem;
    }

    .stat {
        padding: 0.75rem 0.5rem;
    }

    .stat-value {
        font-size: 1.25rem;
    }
}