:root {
    --bg-color: #0f172a;
    --panel-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --border-color: #334155;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #10b981;
    --success-hover: #059669;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem;
}

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

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.settings-panel {
    background: var(--panel-bg);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
}

.setting-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.setting-group label {
    font-size: 0.9rem;
    font-weight: 500;
}

select {
    padding: 0.75rem;
    border-radius: 8px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

select:focus {
    border-color: var(--primary);
}

input[type="range"] {
    width: 100%;
    margin-top: 0.5rem;
}

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    padding: 4rem 2rem;
    text-align: center;
    background: rgba(30, 41, 59, 0.5);
    transition: all 0.3s ease;
    margin-bottom: 2rem;
}

.drop-zone.dragover {
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.1);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.drop-zone-content svg {
    color: var(--primary);
    margin-bottom: 1rem;
}

.or-text {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 1rem;
}

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

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

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

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

.danger-btn {
    background: var(--danger);
    color: white;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.danger-btn:hover {
    background: var(--danger-hover);
}

.action-bar {
    display: flex;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.hidden {
    display: none !important;
}

.file-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.file-item {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.file-name {
    font-weight: 500;
}

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

.file-actions {
    display: flex;
    gap: 0.5rem;
}

.download-btn {
    background: var(--success);
    color: white;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    font-size: 0.875rem;
}

.download-btn:hover {
    background: var(--success-hover);
}

footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.875rem;
}