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

:root {
    --bg: #0f1117;
    --sidebar-bg: #161822;
    --card-bg: #1c1f2e;
    --border: #2a2d3e;
    --text: #e1e4ed;
    --text-dim: #8b8fa3;
    --accent: #6c8cff;
    --accent-hover: #8ba4ff;
    --danger: #ff6b6b;
    --success: #51cf66;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    height: 100vh;
    overflow: hidden;
}

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

/* Sidebar */
.sidebar {
    width: 280px;
    min-width: 280px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.logo {
    padding: 20px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent);
    border-bottom: 1px solid var(--border);
}

.add-feed {
    padding: 12px;
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--border);
}

.add-feed input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--text);
    font-size: 0.85rem;
    outline: none;
    transition: border-color 0.2s;
}

.add-feed input:focus {
    border-color: var(--accent);
}

.add-feed button {
    padding: 8px 14px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: background 0.2s;
    white-space: nowrap;
}

.add-feed button:hover {
    background: var(--accent-hover);
}

.add-feed button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.error {
    padding: 8px 12px;
    color: var(--danger);
    font-size: 0.8rem;
    border-bottom: 1px solid var(--border);
}

.hidden {
    display: none;
}

#feed-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}

.feed-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.15s;
    border-left: 3px solid transparent;
}

.feed-item:hover {
    background: rgba(108, 140, 255, 0.08);
    color: var(--text);
}

.feed-item.active {
    background: rgba(108, 140, 255, 0.12);
    color: var(--accent);
    border-left-color: var(--accent);
}

.feed-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.feed-delete {
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 1rem;
    padding: 2px 4px;
    border-radius: 4px;
    opacity: 0;
    transition: all 0.15s;
}

.feed-item:hover .feed-delete {
    opacity: 1;
}

.feed-delete:hover {
    color: var(--danger);
    background: rgba(255, 107, 107, 0.15);
}

/* Main content */
.content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
}

.toolbar h2 {
    font-size: 1.1rem;
    font-weight: 600;
}

#refresh-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--text);
    font-size: 1.2rem;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

#refresh-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

#refresh-btn.spinning {
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Articles */
.articles {
    flex: 1;
    overflow-y: auto;
    padding: 16px 24px;
}

.loading {
    text-align: center;
    color: var(--text-dim);
    padding: 48px 0;
    font-size: 0.95rem;
}

.empty {
    text-align: center;
    color: var(--text-dim);
    padding: 48px 0;
}

.empty p:first-child {
    font-size: 2rem;
    margin-bottom: 8px;
}

.article-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 18px 20px;
    margin-bottom: 12px;
    transition: all 0.2s;
    cursor: pointer;
}

.article-card:hover {
    border-color: var(--accent);
    transform: translateY(-1px);
}

.article-card.read {
    opacity: 0.55;
}

.article-card.read:hover {
    opacity: 0.8;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
    font-size: 0.78rem;
    color: var(--text-dim);
}

.article-feed-badge {
    background: rgba(108, 140, 255, 0.15);
    color: var(--accent);
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 500;
}

.article-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
}

.article-title a {
    color: var(--text);
    text-decoration: none;
}

.article-title a:hover {
    color: var(--accent);
}

.article-summary {
    font-size: 0.85rem;
    color: var(--text-dim);
    line-height: 1.6;
    max-height: 3.2em;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.article-actions {
    margin-top: 10px;
    display: flex;
    gap: 8px;
}

.read-toggle {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-dim);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.15s;
}

.read-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

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

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

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

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

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        min-width: 100%;
        position: fixed;
        z-index: 10;
        transform: translateX(-100%);
        transition: transform 0.3s;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .articles {
        padding: 12px;
    }
}