/* Base */
:root {
    --ink: #1f2937;
    --brand: #2c7da0;
    --brand-accent: #90e0ef;

    --pill-inner-bg: #e0fbfc;
    --pill-inner-bd: #90e0ef;
    --pill-left-bg: #f0f9ff;
    --pill-left-bd: #93c5fd;
    --pill-under-bg: #ecfdf5;
    --pill-under-bd: #86efac;
    --pill-ex-bg: #fff7ed;
    --pill-ex-bd: #fdba74;

    --panel-inner-bg: #f0f9ff;
    --panel-inner-bd: #90e0ef;
    --panel-left-bg: #eff6ff;
    --panel-left-bd: #93c5fd;
    --panel-under-bg: #ecfdf5;
    --panel-under-bd: #86efac;
    --panel-ex-bg: #fff7ed;
    --panel-ex-bd: #fdba74;

    --code-bg: #0b1020;
    --code-fg: #e5e7eb;
    --result-bg: #111827;
    --result-fg: #f9fafb;

    --border: #e5e7eb;
}

html,
body {
    margin: 0;
    padding: 0;
}

.page {
    font-family: Arial, sans-serif;
    line-height: 1.55;
    color: var(--ink);
    padding: 0 16px 24px;
}

/* Header */
.header {
    background: var(--brand);
    color: #fff;
    padding: 18px;
    border-radius: 10px;
    border: 2px solid var(--brand-accent);
    text-align: center;
}

.header__title {
    margin: 0;
    font-size: 24px;
}

.header__subtitle {
    margin: 6px 0 0;
}

/* Sticky nav */
.sticky-nav {
    position: sticky;
    top: 0;
    z-index: 10;
    background: #fff;
    padding: 8px 0;
    margin: 10px 0 16px;
    border-bottom: 1px solid var(--border);
}

.pill {
    display: inline-block;
    margin-right: 12px;
    text-decoration: none;
    padding: 6px 10px;
    border-radius: 16px;
    color: #0f172a;
    border: 1px solid transparent;
}

.pill--inner {
    background: var(--pill-inner-bg);
    border-color: var(--pill-inner-bd);
}

.pill--left {
    background: var(--pill-left-bg);
    border-color: var(--pill-left-bd);
}

.pill--underhood {
    background: var(--pill-under-bg);
    border-color: var(--pill-under-bd);
}

.pill--examples {
    background: var(--pill-ex-bg);
    border-color: var(--pill-ex-bd);
}

/* Sections */
.section {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px;
    margin-bottom: 14px;
}

.section--inner {
    background: var(--panel-inner-bg);
    border-color: var(--panel-inner-bd);
}

.section--left {
    background: var(--panel-left-bg);
    border-color: var(--panel-left-bd);
}

.section--underhood {
    background: var(--panel-under-bg);
    border-color: var(--panel-under-bd);
}

.section--examples {
    background: var(--panel-ex-bg);
    border-color: var(--panel-ex-bd);
}

.section__title {
    margin-top: 0;
    color: #0f172a;
}

.section__title--underhood {
    color: #065f46;
}

.section__title--examples {
    color: #7c2d12;
}

/* Code blocks */
.code {
    white-space: pre-wrap;
    background: var(--code-bg);
    color: var(--code-fg);
    padding: 12px;
    border-radius: 8px;
    overflow: auto;
}

.code--tight {
    padding: 10px;
}

/* Back to top */
.to-top {
    margin: 10px 0 0;
    text-align: right;
}

.to-top__link {
    font-size: 12px;
    text-decoration: none;
    color: #2563eb;
}

/* Under the hood lists */
.subhead {
    margin: 10px 0 6px;
}

.list {
    margin: 6px 0 10px 18px;
}

/* Examples grid */
.examples {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

@media (max-width: 800px) {
    .examples {
        grid-template-columns: 1fr;
    }
}

.card {
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 10px;
}

.card__title {
    margin: 6px 0;
}

/* Tables */
.tbl {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    margin-bottom: 8px;
}

.tbl thead tr {
    background: #e2e8f0;
}

.tbl th {
    text-align: left;
    padding: 6px;
    border-bottom: 1px solid #cbd5e1;
}

.tbl td {
    vertical-align: top;
    padding: 6px;
}

/* Results */
.result {
    white-space: pre-wrap;
    background: var(--result-bg);
    color: var(--result-fg);
    padding: 8px;
    border-radius: 6px;
}

/* Notes */
.note {
    margin: 6px 0;
    font-size: 12px;
    color: #374151;
}

/* Footer tip */
.tip {
    border: 1px dashed #cbd5e1;
    border-radius: 8px;
    padding: 12px;
    background: #f8fafc;
}