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

:root {
    --color-bg: #ffffff;
    --color-text: #1a1a1a;
    --color-text-muted: #6b7280;
    --color-accent: #2563eb;
    --color-border: #e5e7eb;
    --color-header-bg: #0f172a;
    --color-header-text: #f8fafc;
    --color-header-link: #94a3b8;

    --font: system-ui, -apple-system, sans-serif;
    --font-mono: ui-monospace, 'Cascadia Code', monospace;

    --max-width: 960px;
    --radius: 6px;
}

body {
    font-family: var(--font), serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.65;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ── Header ── */
.site-header {
    background: var(--color-header-bg);
    color: var(--color-header-text);
    padding: 0.875rem 1.5rem;
}

.site-header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.site-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-header-text);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.site-nav {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.site-nav a {
    color: var(--color-header-link);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.15s;
}

.site-nav a:hover,
.site-nav a.active-nav-link {
    color: var(--color-header-text);
}

/* ── Main ── */
.site-main {
    flex: 1;
    max-width: var(--max-width);
    width: 100%;
    margin: 0 auto;
    padding: 2.5rem 1.5rem;
}

/* ── Page header ── */
.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 1.875rem;
    font-weight: 700;
    letter-spacing: -0.04em;
    margin-bottom: 0.375rem;
}

.page-header p {
    color: var(--color-text-muted);
    font-size: 1rem;
}

/* ── Cards grid ── */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
}

.card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.15s, box-shadow 0.15s;
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.07);
}

.card-tag {
    font-size: 0.7rem;
    font-family: var(--font-mono), serif;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-title {
    font-weight: 600;
    font-size: 1rem;
}

.card-desc {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    flex: 1;
}

/* ── Stub notice ── */
.stub-notice {
    display: inline-flex;
    align-items: center;
    background: #fef9c3;
    color: #854d0e;
    border: 1px solid #fde68a;
    border-radius: var(--radius);
    padding: 0.25rem 0.625rem;
    font-size: 0.75rem;
    font-family: var(--font-mono), serif;
    margin-bottom: 1.5rem;
}

/* ── Footer ── */
.site-footer {
    text-align: center;
    padding: 1.5rem;
    color: var(--color-text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--color-border);
}

/* ── Blazor error UI ── */
#blazor-error-ui {
    display: none;
    background: #b32121;
    color: white;
    padding: 0.75rem 1rem;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    font-size: 0.875rem;
    z-index: 1000;
}

#blazor-error-ui .reload {
    color: #ffd;
    margin-left: 0.5rem;
}

#blazor-error-ui .dismiss {
    cursor: pointer;
    float: right;
}

/* ── Responsive ── */
@media (max-width: 640px) {
    .site-header-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .site-main {
        padding: 1.5rem 1rem;
    }

    .page-header h1 {
        font-size: 1.5rem;
    }
}