:root {
    --bg-darker: #1a1d21;
    --bg-dark: #212529;
    --border-color: #373b3f;
    --text-muted: #8b949e;
    --accent: #58a6ff;
}

body {
    background-color: #0d1117;
    color: #e6edf3;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    min-height: 100vh;
}

.bg-darker {
    background-color: var(--bg-darker) !important;
}

.card {
    border-radius: 12px;
}

.card-header {
    border-radius: 12px 12px 0 0 !important;
}

.nav-tabs {
    border-bottom-color: var(--border-color);
}

.nav-tabs .nav-link {
    color: var(--text-muted);
    border: none;
    border-bottom: 2px solid transparent;
    padding: 0.5rem 1rem;
    border-radius: 0;
    transition: all 0.2s;
}

.nav-tabs .nav-link:hover {
    color: #e6edf3;
    border-bottom-color: var(--border-color);
}

.nav-tabs .nav-link.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    background: transparent;
}

/* Device Cards */
.device-card {
    display: block;
    cursor: pointer;
    user-select: none;
}

.device-card .device-checkbox {
    display: none;
}

.device-card-inner {
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-darker);
    transition: all 0.15s ease;
}

.device-card:hover .device-card-inner {
    border-color: var(--accent);
    background: #161b22;
}

.device-checkbox:checked ~ .device-card-inner {
    border-color: var(--accent);
    background: rgba(88, 166, 255, 0.08);
    box-shadow: 0 0 0 1px var(--accent);
}

.device-card-disabled .device-card-inner {
    opacity: 0.45;
    cursor: not-allowed;
}

.device-card-disabled:hover .device-card-inner {
    border-color: var(--border-color);
    background: var(--bg-darker);
}

.device-name {
    font-size: 0.85rem;
    font-weight: 600;
    color: #e6edf3;
    line-height: 1.2;
}

.device-specs {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Sitemap Preview */
.sitemap-url-list {
    max-height: 250px;
    overflow-y: auto;
    background: var(--bg-darker);
}

.sitemap-url-item {
    padding: 4px 8px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: #c9d1d9;
}

.sitemap-url-item:last-child {
    border-bottom: none;
}

/* Screenshot Cards */
.screenshot-card {
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    background: var(--bg-darker);
    transition: transform 0.15s, box-shadow 0.15s;
}

.screenshot-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

.screenshot-preview {
    position: relative;
    width: 100%;
    min-height: 180px;
    background: #161b22;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.screenshot-preview img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    max-height: 350px;
}

.screenshot-pending,
.screenshot-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 24px;
    text-align: center;
}

.screenshot-pending {
    color: var(--text-muted);
}

.screenshot-pending i {
    font-size: 2rem;
    opacity: 0.5;
}

.screenshot-error {
    color: #f85149;
}

.screenshot-error i {
    font-size: 2rem;
}

.screenshot-error small {
    color: var(--text-muted);
    font-size: 0.7rem;
    max-width: 160px;
    word-break: break-word;
}

.screenshot-info {
    padding: 10px 12px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
}

.screenshot-actions {
    display: flex;
    gap: 4px;
    margin-left: auto;
}

.screenshot-device {
    font-size: 0.8rem;
    font-weight: 600;
    color: #e6edf3;
    flex: 1;
}

.screenshot-specs {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Progress bar */
.progress {
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    transition: width 0.4s ease;
}

/* List group dark theme */
.list-group-item.bg-dark:hover {
    background-color: #161b22 !important;
}

/* Form elements */
.form-control:focus,
.form-select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 0.2rem rgba(88, 166, 255, 0.15);
    background-color: var(--bg-darker);
    color: #e6edf3;
}

.form-check-input:checked {
    background-color: var(--accent);
    border-color: var(--accent);
}

.btn-primary {
    background-color: #238636;
    border-color: #238636;
}

.btn-primary:hover {
    background-color: #2ea043;
    border-color: #2ea043;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .screenshot-preview {
        min-height: 140px;
    }

    .screenshot-preview img {
        max-height: 250px;
    }
}