/* WarmHub answer exchange: the Design docs site, a layout after the Cloudflare
   dashboard (sidebar, page headers, tabs, cards, tables), with the type and
   color of the Jev playground (monospace eyebrows, slate ink, blue accent). */

:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --panel-2: #fafbfc;
  --ink: #19232e;
  --ink-2: #3a4654;
  --muted: #606b78;
  --faint: #8a94a1;
  --line: #e3e7ec;
  --line-strong: #cfd6df;
  --accent: #2459cf;
  --accent-hover: #1d4bb0;
  --accent-soft: #edf2fd;
  --accent-ink: #ffffff;
  --link: #204fab;
  --brand: #e8590c;
  --ok: #17784b;
  --ok-soft: #e7f5ed;
  --warn: #965400;
  --warn-soft: #fdf3e2;
  --bad: #c0331f;
  --bad-soft: #fdecea;
  --neutral-soft: #eef1f4;
  --code: #f3f5f8;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.05);
  --shadow-lg: 0 12px 32px rgba(16, 24, 40, 0.16);
  --radius: 8px;
  --radius-sm: 5px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sidebar: 248px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116;
    --panel: #161a21;
    --panel-2: #1b2029;
    --ink: #e6e9ee;
    --ink-2: #c4cad3;
    --muted: #98a2b0;
    --faint: #6f7987;
    --line: #262c36;
    --line-strong: #353d49;
    --accent: #6d9bff;
    --accent-hover: #8db1ff;
    --accent-soft: #1b2740;
    --accent-ink: #0e1116;
    --link: #8db1ff;
    --brand: #ff7a33;
    --ok: #4cc38a;
    --ok-soft: #12291f;
    --warn: #f0b34a;
    --warn-soft: #2d230f;
    --bad: #ff7b6b;
    --bad-soft: #2f1613;
    --neutral-soft: #222833;
    --code: #1e232c;
    --shadow: none;
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.5 var(--font);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
code, .mono { font-family: var(--mono); font-size: 0.9em; }
h1, h2, h3 { margin: 0; color: var(--ink); }
svg { stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* ------------------------------------------------------------ layout */

.app { display: grid; grid-template-columns: var(--sidebar) minmax(0, 1fr); min-height: 100vh; }

.sidebar {
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
  display: flex; flex-direction: column; gap: 14px;
  padding: 16px 12px; background: var(--panel); border-right: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; padding: 4px 8px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--brand); display: grid; place-items: center; }
.brand-mark svg { stroke: none; }
.brand-text { display: grid; line-height: 1.15; }
.brand-name { font-weight: 700; letter-spacing: -0.2px; }
.brand-sub { font-size: 12px; color: var(--muted); }
.tag {
  margin-left: auto; font: 500 10px/1 var(--mono); letter-spacing: 0.8px; text-transform: uppercase;
  color: var(--muted); border: 1px solid var(--line-strong); border-radius: 999px; padding: 4px 7px;
}

.nav { display: grid; gap: 1px; }
.nav-group { margin: 12px 10px 4px; font: 500 11px/1 var(--mono); letter-spacing: 1.2px; text-transform: uppercase; color: var(--faint); }
.nav a {
  display: flex; align-items: center; gap: 10px; padding: 7px 10px; border-radius: 6px;
  color: var(--ink-2); font-weight: 500;
}
.nav a svg { width: 17px; height: 17px; flex: none; color: var(--muted); }
.nav a:hover { background: var(--neutral-soft); text-decoration: none; }
.nav a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); }
.nav a[aria-current="page"] svg { color: var(--accent); }

.sidebar-foot { margin-top: auto; padding: 10px; color: var(--faint); font-size: 12px; border-top: 1px solid var(--line); }

.main { min-width: 0; display: flex; flex-direction: column; }
.topbar {
  position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 12px;
  height: 52px; padding: 0 28px; background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(6px); border-bottom: 1px solid var(--line);
}
.crumbs { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 13px; min-width: 0; }
.crumbs a { color: var(--muted); }
.crumbs .sep { color: var(--faint); }
.crumbs .current { color: var(--ink); font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.icon-button.menu { display: none; }
.page { width: 100%; max-width: 1120px; margin: 0 auto; padding: 28px 28px 64px; }
.scrim { position: fixed; inset: 0; background: rgba(10, 14, 20, 0.4); z-index: 19; }

/* ----------------------------------------------------- page headers */

.eyebrow { font: 500 11.5px/1.2 var(--mono); letter-spacing: 1.2px; text-transform: uppercase; color: var(--muted); }
.eyebrow.accent { color: var(--accent); }
.page-header { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 20px; }
.page-header h1 { font-size: 28px; line-height: 1.15; font-weight: 650; letter-spacing: -0.8px; margin-top: 6px; }
.page-header p { margin: 6px 0 0; color: var(--muted); max-width: 680px; }
.page-header .meta { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-top: 10px; color: var(--muted); font-size: 13px; }

.section-title { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin: 28px 0 10px; }
.section-title h2 { font-size: 15px; font-weight: 600; }

/* ------------------------------------------------------------- cards */

.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.card + .card { margin-top: 12px; }
.card-body { padding: 16px 18px; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 18px; border-bottom: 1px solid var(--line); }
.card-head h2, .card-head h3 { font-size: 14px; font-weight: 600; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.grid-2 > .card + .card { margin-top: 0; }

/* ----------------------------------------------------------- buttons */

.icon-button { display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 6px; border: 0; background: transparent; color: var(--muted); cursor: pointer; }
.icon-button:hover { background: var(--neutral-soft); color: var(--ink); }

/* ------------------------------------------------------------ inputs */

select, input[type="number"], textarea {
  font: inherit; color: var(--ink); background: var(--panel);
  border: 1px solid var(--line-strong); border-radius: var(--radius-sm); padding: 7px 9px;
}
select:focus, input:focus, textarea:focus { outline: 2px solid color-mix(in srgb, var(--accent) 35%, transparent); outline-offset: 0; border-color: var(--accent); }
textarea { width: 100%; resize: vertical; }

/* ---------------------------------------------------- pills and chips */

.pill {
  display: inline-flex; align-items: center; gap: 5px; font: 600 12px/1 var(--font);
  padding: 4px 8px; border-radius: 999px; background: var(--neutral-soft); color: var(--ink-2); white-space: nowrap;
}
.pill::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; opacity: 0.8; }
.pill.ok { background: var(--ok-soft); color: var(--ok); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }
.pill.info { background: var(--accent-soft); color: var(--accent); }
.chip {
  display: inline-flex; align-items: center; gap: 4px; font-size: 12.5px; color: var(--ink-2);
  background: var(--panel-2); border: 1px solid var(--line); border-radius: 6px; padding: 3px 8px;
}
.chip .k { color: var(--muted); }

/* ------------------------------------------------------------ tables */

table.table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.table th {
  text-align: left; font: 500 11.5px/1.2 var(--mono); letter-spacing: 0.8px; text-transform: uppercase; color: var(--muted);
  padding: 10px 14px; border-bottom: 1px solid var(--line); background: var(--panel-2); white-space: nowrap;
}
.table td { padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.table tr:last-child td { border-bottom: 0; }
.table .num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }

.table-wrap { overflow-x: auto; }
.muted { color: var(--muted); }
.small { font-size: 12.5px; }

/* ---------------------------------------------------- key-value */

.kv { display: grid; grid-template-columns: minmax(140px, 220px) minmax(0, 1fr); gap: 0; font-size: 13.5px; }
.kv > div { padding: 7px 0; border-bottom: 1px solid var(--line); overflow-wrap: anywhere; }
.kv > div:nth-last-child(-n + 2) { border-bottom: 0; }
.kv .k { color: var(--muted); padding-right: 16px; }

/* ---------------------------------------------------------- callouts */

.callout { display: grid; gap: 4px; padding: 10px 12px; border-radius: var(--radius-sm); background: var(--neutral-soft); color: var(--ink-2); font-size: 13.5px; }
.callout.warn { background: var(--warn-soft); }
.callout.info { background: var(--accent-soft); }
.callout ul { margin: 4px 0 0; padding-left: 18px; }

/* ---------------------------------------------------------- legend */

.legend { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 12.5px; color: var(--muted); }
.legend i { display: inline-block; width: 9px; height: 9px; border-radius: 2px; margin-right: 5px; vertical-align: -1px; }

/* ------------------------------------------------------------- misc */

.empty { padding: 28px; text-align: center; color: var(--muted); }

/* ----------------------------------------------------------- narrow */

@media (max-width: 960px) {
  .app { grid-template-columns: minmax(0, 1fr); }
  .sidebar { position: fixed; z-index: 20; left: 0; top: 0; width: min(280px, 86vw); transform: translateX(-100%); transition: transform 0.2s; box-shadow: var(--shadow-lg); }
  .sidebar.open { transform: none; }
  .icon-button.menu { display: inline-grid; }
  .topbar { padding: 0 16px; }
  .page { padding: 20px 16px 48px; }
  .grid-2 { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 640px) {
  .page-header { flex-direction: column; align-items: stretch; }
  .page-header h1 { font-size: 24px; }
  .kv { grid-template-columns: minmax(0, 1fr); }
  .kv .k { padding-bottom: 0; border-bottom: 0 !important; font-size: 12px; }
}

/* Key-value lists stack inside narrow cards. */
.card-body { container-type: inline-size; }
@container (max-width: 460px) {
  .kv { grid-template-columns: minmax(0, 1fr); }
  .kv .k { padding: 8px 0 0; border-bottom: 0 !important; font-size: 12px; }
  .kv > div:not(.k) { padding-top: 2px; }
}

/* Design > Architecture diagram. The global svg rule strokes everything and
   fills nothing, so each part sets its own fill and stroke. */
.arch-card { padding: 12px; }
.arch-scroll { overflow-x: auto; }
.arch { display: block; width: 100%; min-width: 960px; height: auto; stroke: none; }
.arch text { fill: var(--ink); stroke: none; font-family: var(--font); font-size: 12px; }
.arch .title { font-size: 13px; font-weight: 650; }
.arch .title.small { font-size: 11px; font-family: var(--mono); }
.arch .block-title { font-size: 14px; font-weight: 700; }
.arch .sub { fill: var(--muted); font-size: 11.5px; }
.arch .num { font-size: 11px; font-weight: 700; fill: var(--accent); }
.arch .status { font-size: 10.5px; font-weight: 650; text-transform: uppercase; letter-spacing: 0.04em; }
.arch .status.running { fill: var(--ok); }
.arch .status.planned { fill: var(--warn); }
.arch .region { fill: none; stroke: var(--line-strong); stroke-width: 1; }
.arch .cf-region { fill: color-mix(in srgb, var(--brand) 5%, transparent); stroke: color-mix(in srgb, var(--brand) 55%, transparent); }
.arch .region-label { font-size: 12px; font-weight: 700; fill: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.arch .region-label.cf { fill: var(--brand); }
.arch .box { fill: var(--panel); stroke: var(--line-strong); stroke-width: 1; }
.arch .box.worker { fill: var(--panel-2); stroke: var(--line-strong); }
.arch .box.block { stroke: var(--accent); stroke-width: 1.4; }
.arch .box.ext { fill: var(--panel); }
.arch .planned { stroke-dasharray: 5 4; }
.arch .step { fill: var(--panel-2); stroke: var(--line); stroke-width: 1; }
.arch .step-num { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1; }
.arch .chip rect { fill: var(--panel); stroke-width: 1.2; }
.arch .chip text { font-size: 11px; font-weight: 600; }
.arch .chip-cf rect { stroke: var(--brand); }
.arch .chip-cf text { fill: var(--brand); }
.arch .chip-ext rect { stroke: var(--ink-2); }
.arch .chip-ext text { fill: var(--ink-2); }
.arch .arrow { fill: none; stroke: var(--accent); stroke-width: 1.6; }
.arch .arrowhead { fill: var(--accent); stroke: none; }
.arch .arrow-label { font-size: 10.5px; fill: var(--accent); font-weight: 600; }

/* ------------------------------------------------------- design pages */

.design-tools { display: grid; gap: 10px; margin: 0 0 20px; }
.filter-input { width: 100%; max-width: 420px; font: inherit; color: var(--ink); background: var(--panel); border: 1px solid var(--line-strong); border-radius: var(--radius-sm); padding: 8px 10px; }
.toc { display: flex; flex-wrap: wrap; gap: 6px; }
.toc-link { font: 500 12.5px/1 var(--font); color: var(--muted); background: var(--panel); border: 1px solid var(--line); border-radius: 999px; padding: 6px 10px; cursor: pointer; }
.toc-link:hover { color: var(--accent); border-color: var(--accent); }
.design-section { margin-top: 28px; scroll-margin-top: 64px; }
.design-section .section-title { margin-bottom: 10px; }
.design-section .section-title h2 { font-size: 17px; }
.section-note { color: var(--muted); max-width: 760px; margin: 0 0 12px; }
.boundary-rule { margin-top: 12px; }
.boundary-rule p { margin: 2px 0; }
.defs { margin: 0; }
.def { display: grid; grid-template-columns: minmax(150px, 220px) minmax(0, 1fr); gap: 4px 18px; padding: 11px 18px; border-bottom: 1px solid var(--line); }
.def:last-child { border-bottom: 0; }
.def dt { font-weight: 600; display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px; }
.def dd { margin: 0; }
.def dd .small { margin-top: 4px; }
.def-list { margin: 0; padding-left: 18px; }
.def-list li + li { margin-top: 3px; }
.service-card .role { margin: 0 0 10px; font-size: 14.5px; }
.design-table td { vertical-align: top; }
.design-table td.step-name { font-weight: 600; min-width: 150px; }
.design-table td.num { color: var(--muted); }
.seq-legend { margin: 8px 6px 2px; }
.callout p:first-of-type { margin-top: 4px; }

.seq { display: block; width: 100%; min-width: 900px; height: auto; stroke: none; }
.seq text { fill: var(--ink); stroke: none; font-family: var(--font); font-size: 11.5px; }
.seq .band { fill: var(--panel-2); }
.seq .lane-head { fill: var(--panel); stroke: var(--line-strong); stroke-width: 1; }
.seq .lane-title { font-size: 12.5px; font-weight: 650; }
.seq .lane-sub { fill: var(--muted); font-size: 10.5px; }
.seq .lifeline { stroke: var(--line-strong); stroke-width: 1; stroke-dasharray: 3 4; }
.seq .num-dot { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1; }
.seq .num { font-size: 11px; font-weight: 700; fill: var(--accent); }
.seq .msg { fill: none; stroke: var(--accent); stroke-width: 1.6; }
.seq .msg.ret { stroke: var(--muted); stroke-width: 1; }
.seq .msg.planned { stroke: var(--warn); stroke-dasharray: 5 4; }
.seq .msg-label { font-weight: 600; fill: var(--accent); }
.seq .msg-label.ret { fill: var(--muted); font-weight: 500; }
.seq .msg-label.planned { fill: var(--warn); }
.seq .arrowhead { fill: var(--accent); stroke: none; }
.seq .arrowhead.ret { fill: var(--muted); }
.seq .arrowhead.planned { fill: var(--warn); }
.seq .note { fill: var(--panel); stroke: var(--accent); stroke-width: 1; }
.seq .note.planned { stroke: var(--warn); stroke-dasharray: 4 3; }
.seq .note-text { font-size: 11.5px; }

@media (max-width: 640px) {
  .def { grid-template-columns: minmax(0, 1fr); padding: 10px 14px; }
}

/* Long-form Design pages, loaded from public/design/*.html. */
.doc { max-width: 900px; }
.doc > section { margin-top: 28px; scroll-margin-top: 64px; }
.doc > section:first-child { margin-top: 4px; }
.doc h2 { font-size: 17px; font-weight: 600; margin: 0 0 10px; }
.doc h3 { font-size: 14.5px; font-weight: 600; margin: 20px 0 6px; }
.doc p { margin: 0 0 10px; }
.doc ul, .doc ol { margin: 0 0 12px; padding-left: 22px; }
.doc li + li { margin-top: 4px; }
.doc pre { margin: 0 0 14px; padding: 12px 14px; background: var(--code); border: 1px solid var(--line); border-radius: var(--radius-sm); overflow-x: auto; font: 12.5px/1.5 var(--mono); }
.doc pre code { font-size: inherit; }
.doc .card { margin: 0 0 14px; }
.doc .table td { vertical-align: top; }
.doc .pill { margin-right: 4px; }
.doc-defs { margin: 0 0 12px; display: grid; grid-template-columns: minmax(120px, 190px) minmax(0, 1fr); gap: 6px 16px; }
.doc-defs dt { font-weight: 600; }
.doc-defs dd { margin: 0; }
@media (max-width: 640px) {
  .doc-defs { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .doc-defs dd { margin-bottom: 8px; }
}