:root {
    --bg-main: #0f172a;
    --bg-panel: #1e293b;
    --bg-hover: #334155;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #334155;
    
    --radius-lg: 12px;
    --radius-md: 8px;
    --radius-sm: 4px;
    
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.6;
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
}

/* SIDEBAR */
.sidebar {
    width: 380px;
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: -0.025em;
}

.filters-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 12px;
}

.filter-select {
    width: 100%;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    outline: none;
    cursor: pointer;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.btn {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.2s;
    color: #fff;
}

.btn-block {
    display: block;
    width: 100%;
    margin-top: 16px;
}

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

.btn-secondary {
    background-color: var(--border);
    border-color: var(--border);
    color: var(--text-main);
}
.btn-secondary:hover:not(:disabled) {
    background-color: var(--bg-hover);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--border) !important;
    border-color: var(--border) !important;
}

.btn-success {
    background-color: #10b981;
    border-color: #10b981;
}
.btn-success:hover {
    background-color: #059669;
}
.btn-success.active {
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.4);
}

.btn-danger {
    background-color: #ef4444;
    border-color: #ef4444;
}
.btn-danger:hover {
    background-color: #dc2626;
}
.btn-danger.active {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.4);
}

.search-box {
    position: relative;
    width: 100%;
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.9rem;
}

#searchInput {
    width: 100%;
    padding: 10px 10px 10px 36px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}

#searchInput:focus {
    border-color: var(--accent);
}

.article-list-container {
    flex-grow: 1;
    overflow-y: auto;
    padding: 16px;
}

/* Scrollbar styles */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #475569;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #64748b;
}

.result-count {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    padding-left: 8px;
}

.article-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.article-item {
    padding: 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    position: relative;
}

.article-item:hover {
    background-color: var(--bg-hover);
}

.article-item.active {
    background-color: var(--bg-hover);
    border-color: var(--accent);
}

.indicator {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
}
.indicator.keep {
    background-color: #10b981;
}
.indicator.ignore {
    background-color: #ef4444;
}
.indicator.unreviewed {
    background-color: var(--text-muted);
}

.item-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
    padding-right: 16px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.item-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* MAIN CONTENT */
.content-area {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow-y: auto;
    padding: 40px;
}

.state-message {
    margin: auto;
    text-align: center;
    color: var(--text-muted);
}

.state-message .icon, 
.state-message .spinner {
    font-size: 3rem;
    margin-bottom: 16px;
}

.state-message h3 {
    margin-bottom: 8px;
    color: var(--text-main);
}

.hidden {
    display: none !important;
}

/* Article Viewer */
.article-viewer {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.article-header {
    margin-bottom: 32px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

#articleTitle {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 16px;
    line-height: 1.2;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.article-actions {
    display: flex;
    gap: 12px;
    margin-top: 8px;
}

.tag {
    font-size: 0.75rem;
    background-color: var(--bg-panel);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.external-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
}

.external-link:hover {
    text-decoration: underline;
}

.article-description {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 32px;
    font-style: italic;
    border-left: 4px solid var(--accent);
    padding-left: 16px;
}

.article-content {
    font-size: 1.05rem;
    color: #e2e8f0;
}

.article-content p {
    margin-bottom: 24px;
    line-height: 1.8;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: 50vh;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    .content-area {
        height: 50vh;
        padding: 20px;
    }
    #articleTitle {
        font-size: 1.5rem;
    }
}