:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #f8fafc;
    --accent-color: #f59e0b;
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --border-color: #334155;
    --success-color: #10b981;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

h1, h2, h3 {
    text-align: center;
}

.subtitle {
    text-align: center;
    color: #94a3b8;
    margin-bottom: 2rem;
}

.tool-card, .ad-card, .info-section {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s;
}

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

.icon-placeholder {
    color: var(--accent-color);
    margin-bottom: 16px;
}

.hidden {
    display: none !important;
}

.btn {
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.2s;
    font-size: 1rem;
}

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

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

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

.btn-secondary:hover {
    background-color: #475569;
}

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

.btn-group {
    display: flex;
    gap: 10px;
}

.btn-toggle {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
}

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

.file-list {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.file-item {
    background-color: var(--bg-color);
    padding: 12px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.file-preview {
    width: 48px;
    height: 48px;
    object-fit: cover;
    border-radius: 4px;
    background-color: #ccc;
}

.file-details {
    display: flex;
    flex-direction: column;
}

.file-name {
    font-weight: 500;
    font-size: 0.9rem;
}

.file-size {
    font-size: 0.8rem;
    color: #94a3b8;
}

.file-status {
    font-size: 0.8rem;
    color: var(--accent-color);
}

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

.settings-panel {
    background-color: var(--bg-color);
    padding: 16px;
    border-radius: 8px;
    margin: 20px 0;
}

.setting-group {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.actions {
    margin-top: 20px;
    display: flex;
    gap: 10px;
    justify-content: center;
}

/* Header & Footer from global but scoped here if needed or just relying on global logic from memory */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background-color: var(--card-bg);
    margin-bottom: 40px;
}

footer {
    text-align: center;
    padding: 40px 0;
    color: #64748b;
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
}

@media (max-width: 600px) {
    .btn {
        width: 100%;
    }
    .actions {
        flex-direction: column;
    }
}