:root {
    --bg: #f6f7f9;
    --surface: #ffffff;
    --surface-2: #f1f3f5;
    --border: #dfe3e8;
    --text: #1a1d21;
    --text-muted: #616a75;
    --accent: #2563eb;
    --accent-soft: #dbeafe;
    --danger: #dc2626;
    --radius: 10px;
    --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 4px 12px rgba(16, 24, 40, 0.06);
    color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #14161a;
        --surface: #1c1f24;
        --surface-2: #24282e;
        --border: #333940;
        --text: #e8eaed;
        --text-muted: #9aa4b0;
        --accent: #60a5fa;
        --accent-soft: #1e3a5f;
        --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 4px 12px rgba(0, 0, 0, 0.3);
    }
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    height: 100%;
}

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    font-size: 15px;
    line-height: 1.5;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

h1 {
    font-size: 1.6rem;
    margin: 0 0 0.25rem;
    letter-spacing: -0.01em;
}

h2 {
    font-size: 1.05rem;
    margin: 1.5rem 0 0.5rem;
}

p {
    margin: 0 0 0.75rem;
}

code {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.875em;
    background: var(--surface-2);
    padding: 0.1em 0.35em;
    border-radius: 4px;
}

pre {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.85rem 1rem;
    overflow-x: auto;
    font-size: 0.85rem;
}

pre code {
    background: none;
    padding: 0;
}

a {
    color: var(--accent);
}

/* ---- Layout ---------------------------------------------------------------------------------- */

.app {
    display: grid;
    grid-template-columns: 232px 1fr;
    min-height: 100vh;
}

.sidebar {
    background: var(--surface);
    border-right: 1px solid var(--border);
    padding: 1.25rem 0.85rem;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 650;
    font-size: 1.05rem;
    padding: 0 0.5rem 1rem;
    letter-spacing: -0.01em;
    color: var(--text);
    text-decoration: none;
}

.brand-mark {
    width: 26px;
    height: 26px;
    flex: none;
}

.nav-section {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    padding: 0.9rem 0.6rem 0.35rem;
}

.nav-link {
    display: block;
    padding: 0.4rem 0.6rem;
    border-radius: 7px;
    color: var(--text);
    text-decoration: none;
    font-size: 0.9rem;
}

.nav-link:hover {
    background: var(--surface-2);
}

.nav-link.active {
    background: var(--accent-soft);
    color: var(--accent);
    font-weight: 550;
}

.main {
    padding: 1.75rem 2rem 3rem;
    max-width: 1180px;
    width: 100%;
}

.page-intro {
    color: var(--text-muted);
    max-width: 68ch;
    margin-bottom: 1.25rem;
}

/* ---- Panels and controls ---------------------------------------------------------------------- */

.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 0.6rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.toolbar-separator {
    width: 1px;
    align-self: stretch;
    background: var(--border);
    margin: 0.15rem 0.35rem;
}

.toolbar-spacer {
    flex: 1;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    min-height: 34px;
    padding: 0.3rem 0.65rem;
    border: 1px solid var(--border);
    border-radius: 7px;
    background: var(--surface);
    color: var(--text);
    font: inherit;
    font-size: 0.85rem;
    cursor: pointer;
    white-space: nowrap;
}

.btn:hover:not(:disabled) {
    background: var(--surface-2);
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}

.btn.icon {
    min-width: 34px;
    padding: 0.3rem;
}

.btn.active {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
}

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

.btn.primary:hover:not(:disabled) {
    filter: brightness(1.08);
}

.btn.danger {
    color: var(--danger);
}

.swatch {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: 2px solid var(--border);
    padding: 0;
    cursor: pointer;
}

.swatch.active {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.field {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.field input[type="range"] {
    width: 96px;
    accent-color: var(--accent);
}

select,
input[type="text"],
input[type="number"] {
    font: inherit;
    font-size: 0.85rem;
    padding: 0.3rem 0.45rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface);
    color: var(--text);
    min-height: 34px;
}

.canvas-host {
    background:
        linear-gradient(45deg, var(--surface-2) 25%, transparent 25%) 0 0 / 16px 16px,
        linear-gradient(-45deg, var(--surface-2) 25%, transparent 25%) 0 8px / 16px 16px,
        linear-gradient(45deg, transparent 75%, var(--surface-2) 75%) 8px -8px / 16px 16px,
        linear-gradient(-45deg, transparent 75%, var(--surface-2) 75%) -8px 0 / 16px 16px;
}

.statusbar {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 0.45rem 0.7rem;
    border-top: 1px solid var(--border);
    background: var(--surface);
    font-size: 0.78rem;
    color: var(--text-muted);
}

.statusbar strong {
    color: var(--text);
    font-weight: 600;
}

.badge {
    display: inline-block;
    padding: 0.05rem 0.4rem;
    border-radius: 999px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    font-size: 0.72rem;
}

.badge.on {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
}

.grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.1rem;
}

.card h3 {
    margin: 0 0 0.35rem;
    font-size: 0.95rem;
}

.card p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.87rem;
}

.card a {
    text-decoration: none;
}

.note {
    border-left: 3px solid var(--accent);
    background: var(--surface);
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 0.7rem 0.9rem;
    font-size: 0.87rem;
    color: var(--text-muted);
    margin: 1rem 0;
}

.output {
    max-height: 240px;
    overflow: auto;
    font-size: 0.75rem;
    white-space: pre-wrap;
    word-break: break-all;
}

table {
    border-collapse: collapse;
    width: 100%;
    font-size: 0.85rem;
}

th,
td {
    text-align: left;
    padding: 0.35rem 0.6rem;
    border-bottom: 1px solid var(--border);
}

th {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.split {
    display: grid;
    gap: 1rem;
    grid-template-columns: 1fr 1fr;
}

@media (max-width: 900px) {
    .app {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .main {
        padding: 1.25rem 1rem 2.5rem;
    }

    .split {
        grid-template-columns: 1fr;
    }
}

#blazor-error-ui {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: none;
    padding: 0.7rem 1.2rem;
    background: #fee2e2;
    color: #7f1d1d;
    border-top: 1px solid #fca5a5;
}

#blazor-error-ui .dismiss {
    cursor: pointer;
    float: right;
    font-weight: 700;
}

/* A keyboard user should not have to tab through eleven navigation links to reach the canvas. */
.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 100;
    padding: 0.6rem 1rem;
    background: #111827;
    color: #ffffff;
    border-radius: 0 0 6px 0;
}

.skip-link:focus {
    left: 0;
}

main:focus {
    outline: none;
}