/* rumblr: the design system shared by every page.
   Dark by default, a warm paper theme for light. Colour tokens live on :root;
   every component reads them, so a theme is only a change of tokens. */

:root {
  color-scheme: dark;
  --bg: #07080c;
  --bg-2: #0b0d13;
  --surface: #11141c;
  --surface-2: #171b25;
  --line: rgba(236, 240, 255, 0.08);
  --line-2: rgba(236, 240, 255, 0.16);
  --ink: #eef0f7;
  --ink-2: #b3b9ca;
  --ink-3: #7a8196;
  --accent: oklch(0.74 0.17 285);
  --accent-ink: oklch(0.84 0.11 285);
  --accent-soft: oklch(0.74 0.17 285 / 0.14);
  --gold: oklch(0.83 0.14 80);
  --gold-soft: oklch(0.83 0.14 80 / 0.14);
  --good: oklch(0.8 0.15 155);
  --bad: oklch(0.7 0.18 25);
  --glow: oklch(0.74 0.17 285 / 0.35);
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 20px 60px -20px rgba(0, 0, 0, 0.7);
  --field-l: 0.76;
  --field-c: 0.14;

  --f-display: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --f-body: "Newsreader", "Iowan Old Style", Georgia, serif;
  --f-ui: "Geist", "Inter", system-ui, -apple-system, sans-serif;
  --f-mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --r-1: 8px;
  --r-2: 14px;
  --r-3: 22px;
  --gutter: clamp(16px, 4vw, 40px);
  --text-w: 42rem;
  --wide-w: 64rem;
  --ease: cubic-bezier(0.2, 0.7, 0.1, 1);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f5f1e8;
  --bg-2: #efeadf;
  --surface: #fffcf5;
  --surface-2: #f8f4ea;
  --line: rgba(30, 24, 10, 0.1);
  --line-2: rgba(30, 24, 10, 0.2);
  --ink: #17161b;
  --ink-2: #45434d;
  --ink-3: #75727c;
  --accent: oklch(0.52 0.2 285);
  --accent-ink: oklch(0.45 0.2 285);
  --accent-soft: oklch(0.52 0.2 285 / 0.1);
  --gold: oklch(0.62 0.14 70);
  --gold-soft: oklch(0.62 0.14 70 / 0.12);
  --good: oklch(0.55 0.15 155);
  --bad: oklch(0.55 0.2 25);
  --glow: oklch(0.52 0.2 285 / 0.2);
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.6) inset, 0 18px 50px -24px rgba(60, 40, 10, 0.35);
  --field-l: 0.56;
  --field-c: 0.16;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 1.125rem/1.65 var(--f-body);
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}
img, svg, canvas { display: block; max-width: 100%; }
a { color: var(--accent-ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
::selection { background: var(--accent-soft); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
button { font: inherit; color: inherit; }

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

/* ---------- type ---------- */
.kicker {
  font: 500 0.72rem/1.2 var(--f-mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.kicker b { color: var(--gold); font-weight: 500; }
.display {
  font: 400 clamp(3rem, 9vw, 7.4rem)/0.92 var(--f-display);
  letter-spacing: -0.025em;
  margin: 0;
  text-wrap: balance;
}
.display em { font-style: italic; color: var(--accent-ink); }
h2, .h2 {
  font: 400 clamp(2.1rem, 5vw, 3.4rem)/1.02 var(--f-display);
  letter-spacing: -0.015em;
  margin: 0 0 0.6em;
  text-wrap: balance;
}
h3, .h3 {
  font: 600 1.05rem/1.3 var(--f-ui);
  letter-spacing: -0.01em;
  margin: 2.2em 0 0.6em;
}
p { margin: 0 0 1.05em; }
.lede { font-size: clamp(1.2rem, 2.2vw, 1.45rem); line-height: 1.5; color: var(--ink-2); text-wrap: pretty; }
.ui { font-family: var(--f-ui); }
.mono { font-family: var(--f-mono); font-size: 0.88em; }
.muted { color: var(--ink-3); }
code { font: 0.86em var(--f-mono); background: var(--surface-2); padding: 0.1em 0.35em; border-radius: 5px; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 12px;
  height: 60px; padding: 0 var(--gutter);
  background: color-mix(in oklab, var(--bg) 78%, transparent);
  backdrop-filter: saturate(1.4) blur(18px);
  -webkit-backdrop-filter: saturate(1.4) blur(18px);
  border-bottom: 1px solid var(--line);
  font-family: var(--f-ui);
}
.wordmark {
  display: inline-flex; align-items: center; gap: 9px;
  font: 400 1.6rem/1 var(--f-display); letter-spacing: -0.02em;
  color: var(--ink); text-decoration: none;
}
.wordmark .orb {
  width: 22px; height: 22px; border-radius: 50%;
  background:
    radial-gradient(circle at 32% 30%, #fff 0 8%, transparent 9%),
    conic-gradient(from 200deg, var(--accent), var(--gold), oklch(0.75 0.15 195), var(--accent));
  box-shadow: 0 0 18px var(--glow);
}
.main-nav { display: flex; gap: 2px; margin-left: 14px; font-size: 0.9rem; }
.main-nav a { color: var(--ink-2); text-decoration: none; padding: 7px 12px; border-radius: 999px; }
.main-nav a:hover { color: var(--ink); background: var(--surface); }
.main-nav a[aria-current="page"] { color: var(--ink); background: var(--surface-2); }
/* A link that leaves rumblr says so. */
.a-body a[href^="http"]:not(.btn):not(.lin):not(.code-link):not(.nav-card)::after { content: " ↗"; font-size: 0.8em; }
.crumbs { display: flex; gap: 8px; align-items: center; min-width: 0; font-size: 0.85rem; color: var(--ink-3); }
.crumbs a { color: var(--ink-2); text-decoration: none; }
.crumbs span[aria-hidden] { opacity: 0.5; }
.crumbs .here { color: var(--ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar .spacer { flex: 1; }
.pin-btn {
  display: inline-flex; align-items: center; gap: 10px;
  height: 36px; padding: 0 10px 0 12px; min-width: 0;
  border: 1px solid var(--line-2); border-radius: 999px;
  background: var(--surface); color: var(--ink-3);
  font: 0.86rem var(--f-ui); cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.pin-btn:hover { border-color: var(--accent); color: var(--ink-2); }
.pin-btn kbd { font: 0.72rem var(--f-mono); padding: 2px 6px; border-radius: 5px; background: var(--surface-2); color: var(--ink-3); }
.icon-btn {
  width: 36px; height: 36px; border-radius: 50%;
  display: inline-grid; place-items: center;
  border: 1px solid var(--line-2); background: var(--surface); cursor: pointer; color: var(--ink-2);
}
.icon-btn:hover { border-color: var(--accent); color: var(--ink); }
.icon-btn svg { width: 17px; height: 17px; }
@media (max-width: 720px) {
  .crumbs .mid, .pin-btn .label, .pin-btn kbd { display: none; }
  .pin-btn { width: 36px; padding: 0; justify-content: center; }
}

/* ---------- buttons, chips ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  height: 46px; padding: 0 20px; border-radius: 999px;
  font: 500 0.95rem var(--f-ui); text-decoration: none; cursor: pointer;
  border: 1px solid var(--line-2); background: var(--surface); color: var(--ink);
  transition: transform 0.25s var(--ease), border-color 0.2s, background 0.2s;
}
.btn:hover { transform: translateY(-1px); border-color: var(--ink-3); text-decoration: none; }
.btn.primary {
  background: var(--ink); color: var(--bg); border-color: transparent;
  box-shadow: 0 10px 40px -10px var(--glow);
}
.btn .arrow { transition: transform 0.25s var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }
.chip {
  display: inline-flex; align-items: center; gap: 7px;
  height: 30px; padding: 0 12px; border-radius: 999px;
  font: 500 0.8rem var(--f-ui); color: var(--ink-2);
  border: 1px solid var(--line-2); background: transparent; cursor: pointer;
  transition: all 0.2s;
}
.chip .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--c, var(--accent)); }
.chip[aria-pressed="true"] { background: var(--surface-2); color: var(--ink); border-color: var(--c, var(--accent)); }
.field-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--c); display: inline-block; flex: none; }

/* A colour per field, from its hue. */
[data-hue] { --c: oklch(var(--field-l) var(--field-c) var(--h)); }

/* ---------- segmented control ---------- */
.seg {
  display: inline-flex; padding: 3px; gap: 2px;
  border: 1px solid var(--line-2); border-radius: 999px; background: var(--surface);
  font: 500 0.8rem var(--f-ui);
}
.seg button {
  border: 0; background: transparent; color: var(--ink-3);
  height: 28px; padding: 0 12px; border-radius: 999px; cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
.seg button:not([aria-pressed="true"]):hover { color: var(--ink); }

/* ---------- panels ---------- */
.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-3);
  box-shadow: var(--shadow);
}

/* ---------- Pinpointer (search) ---------- */
.pinpointer {
  position: fixed; inset: 0; z-index: 100;
  display: none; align-items: flex-start; justify-content: center;
  padding: 12vh 16px 16px;
  background: color-mix(in oklab, var(--bg) 55%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.pinpointer.open { display: flex; animation: fade 0.18s var(--ease); }
.pinpointer .box {
  width: min(640px, 100%); max-height: 70vh; display: flex; flex-direction: column; overflow: hidden;
  background: var(--surface); border: 1px solid var(--line-2); border-radius: var(--r-3);
  box-shadow: 0 40px 120px -20px rgba(0, 0, 0, 0.6);
  animation: rise 0.28s var(--ease);
}
.pinpointer .field-row { display: flex; align-items: center; gap: 12px; padding: 16px 18px; border-bottom: 1px solid var(--line); }
.pinpointer input {
  flex: 1; min-width: 0; border: 0; outline: 0; background: transparent; color: var(--ink);
  font: 400 1.35rem var(--f-display);
}
.pinpointer input::placeholder { color: var(--ink-3); }
.pinpointer ul { list-style: none; margin: 0; padding: 8px; overflow: auto; }
.pinpointer li a {
  display: grid; grid-template-columns: auto 1fr auto; gap: 12px; align-items: center;
  padding: 10px 12px; border-radius: var(--r-1); text-decoration: none; color: var(--ink);
  font-family: var(--f-ui);
}
.pinpointer li a[aria-selected="true"], .pinpointer li a:hover { background: var(--surface-2); }
.pinpointer .t { font-size: 0.95rem; line-height: 1.3; }
.pinpointer .m { font-size: 0.78rem; color: var(--ink-3); }
.pinpointer .s { font: 0.7rem var(--f-mono); color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.08em; white-space: nowrap; }
.pinpointer .s.ready { color: var(--good); }
.pinpointer .foot { padding: 10px 18px; border-top: 1px solid var(--line); font: 0.75rem var(--f-ui); color: var(--ink-3); }

/* ---------- glossary tooltip ---------- */
.term {
  text-decoration: underline dotted var(--ink-3); text-underline-offset: 4px; text-decoration-thickness: 1.5px;
  cursor: help; border-radius: 3px;
}
.term:hover, .term:focus-visible { background: var(--accent-soft); text-decoration-color: var(--accent); outline: none; }
.tip {
  position: absolute; z-index: 90; max-width: min(340px, calc(100vw - 32px));
  padding: 14px 16px; border-radius: var(--r-2);
  background: var(--surface-2); border: 1px solid var(--line-2);
  box-shadow: 0 24px 60px -18px rgba(0, 0, 0, 0.6);
  font: 0.88rem/1.5 var(--f-ui); color: var(--ink-2);
  pointer-events: none; opacity: 0; transform: translateY(4px);
  visibility: hidden;
  transition: opacity 0.15s, transform 0.15s var(--ease);
}
.tip.show { opacity: 1; transform: none; pointer-events: auto; visibility: visible; }
.tip b { display: block; color: var(--ink); font-weight: 600; margin-bottom: 4px; font-size: 0.92rem; }

/* ---------- footer ---------- */
.site-foot {
  margin-top: 120px; padding: 48px var(--gutter) 64px;
  border-top: 1px solid var(--line);
  font: 0.85rem/1.6 var(--f-ui); color: var(--ink-3);
}
.site-foot .inner { max-width: var(--wide-w); margin: 0 auto; display: grid; gap: 24px; grid-template-columns: 1fr; }
@media (min-width: 800px) { .site-foot .inner { grid-template-columns: 1.4fr 1fr 1fr; } }
.site-foot a { color: var(--ink-2); }

/* ---------- work in progress, and whose it is ---------- */
.wip {
  display: inline-flex; align-items: center; gap: 7px; flex: none; margin-left: 4px;
  padding: 5px 11px; border-radius: 999px; font-size: 0.76rem; letter-spacing: 0.01em; text-decoration: none;
  color: var(--ink-2); border: 1px solid color-mix(in oklab, var(--gold) 45%, var(--line)); background: color-mix(in oklab, var(--gold) 9%, transparent);
}
.wip:hover { color: var(--ink); border-color: var(--gold); }
.wip i { flex: none; width: 7px; height: 7px; border-radius: 50%; background: var(--gold); }
.wip .short { display: none; }
@media (max-width: 560px) {
  .wip .full { display: none; } .wip .short { display: inline; } .wip { padding: 4px 9px; margin-left: 0; }
  .topbar { gap: 5px; } .topbar .main-nav { margin-left: 0; gap: 0; } .topbar .main-nav a { padding: 6px 7px; }
  .topbar .wordmark { font-size: 1.3rem; gap: 7px; } .topbar .wordmark .orb { width: 20px; height: 20px; }
  .topbar .pin-btn, .topbar .icon-btn { flex: none; }
}
.site-by {
  max-width: var(--wide-w); margin: 36px auto 0; padding-top: 24px; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; align-items: center; gap: 14px 28px; font-size: 0.88rem;
}
.site-by .by-line { margin: 0; color: var(--ink-2); }
.site-by .by-line a { color: var(--ink); text-decoration-color: var(--line-2); text-underline-offset: 3px; }
.site-by .by-in {
  display: inline-flex; align-items: center; gap: 10px; padding: 9px 16px 9px 12px; border-radius: 999px; text-decoration: none;
  color: var(--ink); border: 1px solid var(--line-2); background: var(--surface);
}
.site-by .by-in:hover { border-color: #0a66c2; color: #fff; background: #0a66c2; }
.site-by .by-in svg { flex: none; }
.site-by .by-wip { margin-left: auto; color: var(--ink-3); }
@media (max-width: 640px) { .site-by .by-wip { margin-left: 0; flex-basis: 100%; } }

@media (max-width: 380px) { .wip .short { display: none; } .wip { padding: 9px 10px; } .topbar .wordmark .orb { display: none; } }

/* ---------- motion ---------- */
@keyframes fade { from { opacity: 0; } }
@keyframes rise { from { opacity: 0; transform: translateY(12px) scale(0.99); } }
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }