:root {
    --bg: #f3f6fb;
    --sidebar: #111827;
    --sidebar-soft: #1f2937;
    --primary: #2563eb;
    --text: #1f2937;
    --muted: #6b7280;
    --card: #ffffff;
    --border: #e5e7eb;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

.sidebar {
    width: 280px;
    background: var(--sidebar);
    color: white;
    padding: 24px;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
}

.brand {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 32px;
}

.brand-icon {
    width: 46px;
    height: 46px;
    border-radius: 14px;
    background: var(--primary);
    display: grid;
    place-items: center;
    font-size: 24px;
}

.brand small {
    display: block;
    color: #cbd5e1;
}

.menu {
    display: grid;
    gap: 8px;
}

.menu a {
    color: #e5e7eb;
    text-decoration: none;
    padding: 12px 14px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.menu a:hover {
    background: var(--sidebar-soft);
}

.content {
    margin-left: 280px;
    width: calc(100% - 280px);
    padding: 28px;
}

.topbar {
    margin-bottom: 24px;
}

.topbar h1 {
    font-size: 30px;
    margin: 0;
    font-weight: 800;
}

.topbar p {
    color: var(--muted);
    margin: 4px 0 0;
}

.grid-cards {
    display: grid;
    grid-template-columns: repeat(6, minmax(130px, 1fr));
    gap: 16px;
}

.stat-card {
    background: var(--card);
    padding: 20px;
    border-radius: 18px;
    border: 1px solid var(--border);
    box-shadow: 0 10px 25px rgba(15, 23, 42, .04);
    position: relative;
    overflow: hidden;
}

.stat-card span {
    color: var(--muted);
    font-size: 14px;
}

.stat-card strong {
    display: block;
    font-size: 32px;
    margin-top: 4px;
}

.stat-card i {
    position: absolute;
    right: 18px;
    bottom: 16px;
    font-size: 32px;
    color: rgba(37, 99, 235, .15);
}

.panel {
    background: var(--card);
    padding: 22px;
    border-radius: 18px;
    border: 1px solid var(--border);
    box-shadow: 0 10px 25px rgba(15, 23, 42, .04);
}

.panel h2 {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 16px;
}

.panel h3 {
    font-size: 17px;
    font-weight: 800;
    margin-top: 20px;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.category-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.source-item,
.tool-card,
.timeline-item {
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 14px;
    margin-bottom: 12px;
    background: #fafafa;
}

.tool-card h3 {
    margin-top: 0;
}

.progress {
    height: 20px;
    border-radius: 12px;
}

@media (max-width: 992px) {
    .sidebar {
        position: static;
        width: 100%;
    }

    .app-layout {
        display: block;
    }

    .content {
        margin-left: 0;
        width: 100%;
    }

    .grid-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}