:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.1);
    --success: #22c55e;
    --error: #ef4444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.container {
    width: 100%;
    max-width: 800px;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    padding: 2.5rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

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

header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-secondary);
}

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 1rem;
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 2rem;
}

.drop-zone:hover, .drop-zone.active {
    border-color: var(--primary);
    background: rgba(79, 70, 229, 0.05);
}

.drop-zone i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.drop-zone p span {
    color: var(--primary);
    font-weight: 600;
}

.hidden {
    display: none;
}

.file-list, .results-list {
    margin-top: 1rem;
    background: rgba(15, 23, 42, 0.5);
    border-radius: 0.75rem;
    overflow: hidden;
}

.file-item, .result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.file-item:last-child, .result-item:last-child {
    border-bottom: none;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.file-info i {
    color: var(--text-secondary);
}

.bulk-actions {
    margin-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.bulk-format {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

select {
    background: #1e293b;
    color: white;
    border: 1px solid var(--border-color);
    padding: 0.5rem;
    border-radius: 0.5rem;
    outline: none;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
}

.btn-download {
    color: var(--success);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}

.status-success {
    color: var(--success);
}

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

footer {
    margin-top: 3rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

@media (max-width: 640px) {
    .bulk-actions {
        flex-direction: column;
        align-items: stretch;
    }
}