/* summaverick design system
   Apple HIG: semantic color, SF-style type scale, 8pt grid, liquid-glass
   chrome (nav + tab bar only), light + dark, 44pt targets, reduced motion. */

:root {
  color-scheme: light dark;

  --bg: #f5f5f7;
  --bg-elevated: #ffffff;
  --bg-grouped: #f2f2f7;
  --fill: rgba(120, 120, 128, 0.12);
  --fill-2: rgba(120, 120, 128, 0.2);
  --label: #1d1d1f;
  --label-2: #6e6e73;
  --label-3: #8e8e93;
  --separator: rgba(60, 60, 67, 0.12);
  --accent: #0071e3;
  --accent-press: #0077ed;
  --on-accent: #ffffff;
  --ok: #248a3d;
  --ok-bg: rgba(52, 199, 89, 0.14);
  --bad: #d70015;
  --bad-bg: rgba(255, 59, 48, 0.14);
  --warn: #c93400;
  --link: var(--accent);
  --glass: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.5);
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 18px 50px rgba(0, 0, 0, 0.1);
  --hero-a: #d6e6ff;
  --hero-b: #f3e7ff;
  --hero-c: #e8f8ef;

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Segoe UI", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --large-title: 600 40px/1.1 var(--font);
  --title-1: 600 28px/1.2 var(--font);
  --title-2: 600 22px/1.25 var(--font);
  --title-3: 600 20px/1.25 var(--font);
  --headline: 600 17px/1.3 var(--font);
  --body: 400 17px/1.47 var(--font);
  --callout: 400 16px/1.4 var(--font);
  --subhead: 400 15px/1.35 var(--font);
  --footnote: 400 13px/1.35 var(--font);
  --caption: 400 12px/1.3 var(--font);

  --r: 18px;
  --r-sm: 12px;
  --r-pill: 999px;
  --space: 8px;
  --pad: 20px;
  --max: 1080px;
  --narrow: 720px;
  --nav-h: 52px;
  --tab-h: 56px;
  --target: 44px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-elevated: #1c1c1e;
    --bg-grouped: #1c1c1e;
    --fill: rgba(120, 120, 128, 0.24);
    --fill-2: rgba(120, 120, 128, 0.36);
    --label: #f5f5f7;
    --label-2: #98989d;
    --label-3: #636366;
    --separator: rgba(84, 84, 88, 0.48);
    --accent: #0a84ff;
    --accent-press: #409cff;
    --on-accent: #ffffff;
    --ok: #30d158;
    --ok-bg: rgba(48, 209, 88, 0.16);
    --bad: #ff453a;
    --bad-bg: rgba(255, 69, 58, 0.16);
    --warn: #ff9f0a;
    --glass: rgba(22, 22, 24, 0.72);
    --glass-border: rgba(255, 255, 255, 0.08);
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 18px 50px rgba(0, 0, 0, 0.55);
    --hero-a: #0b1f3a;
    --hero-b: #1a1030;
    --hero-c: #0d2418;
  }
}

@media (prefers-contrast: more) {
  :root {
    --separator: #1d1d1f;
    --label-2: #3a3a3c;
    --glass: #ffffff;
  }
  @media (prefers-color-scheme: dark) {
    :root {
      --separator: #f5f5f7;
      --label-2: #d1d1d6;
      --glass: #000000;
    }
  }
}

*,
*::before,
*::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
html, body { margin: 0; min-height: 100%; }
html { overflow-x: clip; }
body {
  font: var(--body);
  font-family: var(--font);
  background: var(--bg);
  color: var(--label);
  letter-spacing: -0.011em;
}
img { max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  z-index: 100;
  background: var(--accent);
  color: var(--on-accent);
  padding: 8px 14px;
  border-radius: 8px;
}
.skip:focus { top: 12px; }

/* ---- liquid glass chrome (functional layer only) ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  background: var(--glass);
  -webkit-backdrop-filter: saturate(1.4) blur(28px);
  backdrop-filter: saturate(1.4) blur(28px);
  border-bottom: 1px solid var(--separator);
}
.nav .brand {
  font: var(--headline);
  color: var(--label);
  letter-spacing: -0.03em;
  text-decoration: none;
  min-height: var(--target);
  display: inline-flex;
  align-items: center;
  padding-right: 8px;
}
.nav .brand:hover { text-decoration: none; opacity: 0.72; }
.nav-links {
  display: none;
  align-items: center;
  gap: 2px;
  margin-left: 8px;
}
.nav-links a {
  color: var(--label);
  font: var(--subhead);
  min-height: 32px;
  padding: 6px 10px;
  border-radius: 8px;
  text-decoration: none;
}
.nav-links a:hover { background: var(--fill); text-decoration: none; }
.nav-links a[aria-current="page"] { color: var(--accent); font-weight: 600; }
.nav-end {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-search {
  display: none;
  align-items: center;
  gap: 8px;
  background: var(--fill);
  border: 0;
  border-radius: var(--r-pill);
  padding: 0 12px;
  min-height: 32px;
  min-width: 180px;
  color: var(--label-2);
  cursor: pointer;
}
.nav-search svg,
.icon-btn svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}
.nav-search-m.icon-btn { display: none; }
.icon-btn {
  width: var(--target);
  height: var(--target);
  display: inline-grid;
  place-items: center;
  border: 0;
  background: transparent;
  color: var(--label);
  border-radius: 50%;
  cursor: pointer;
  text-decoration: none;
}
.icon-btn:hover { background: var(--fill); text-decoration: none; }

.tabbar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 40;
  display: flex;
  justify-content: space-around;
  padding: 4px 8px calc(4px + env(safe-area-inset-bottom));
  min-height: var(--tab-h);
  background: var(--glass);
  -webkit-backdrop-filter: saturate(1.4) blur(28px);
  backdrop-filter: saturate(1.4) blur(28px);
  border-top: 1px solid var(--separator);
}
.tabbar a {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-height: var(--target);
  color: var(--label-2);
  font: var(--caption);
  text-decoration: none;
}
.tabbar a[aria-current="page"] { color: var(--accent); }
.tabbar svg { width: 22px; height: 22px; }

@media (min-width: 860px) {
  .nav-links, .nav-search { display: flex; }
  .tabbar { display: none; }
  body { padding-bottom: 0; }
}
@media (max-width: 859px) {
  body { padding-bottom: calc(var(--tab-h) + env(safe-area-inset-bottom)); }
  .nav-search-m.icon-btn { display: grid; }
}

.site-foot {
  max-width: var(--max);
  margin: 0 auto;
  padding: 48px 20px 80px;
  color: var(--label-2);
  font: var(--footnote);
  border-top: 1px solid var(--separator);
}
.site-foot nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-bottom: 16px;
}
.site-foot a { color: var(--label-2); }
.site-foot .copy { margin: 0; }

/* ---- layout ---- */
.page {
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 20px 64px;
}
.page.narrow { max-width: var(--narrow); }
.hero {
  text-align: center;
  padding: 56px 16px 40px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -80px -30% -20px;
  height: 520px;
  background:
    radial-gradient(42% 70% at 18% 35%, var(--hero-a), transparent 72%),
    radial-gradient(46% 70% at 82% 28%, var(--hero-b), transparent 72%),
    radial-gradient(40% 55% at 50% 90%, var(--hero-c), transparent 72%);
  pointer-events: none;
  z-index: -1;
}
.eyebrow {
  font: var(--subhead);
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0 0 10px;
}
h1, .large-title {
  font: var(--large-title);
  letter-spacing: -0.022em;
  margin: 0 0 12px;
}
h2 { font: var(--title-2); letter-spacing: -0.02em; margin: 0 0 8px; }
h3 { font: var(--title-3); margin: 0 0 8px; }
.lede {
  font: var(--title-3);
  font-weight: 400;
  color: var(--label-2);
  max-width: 34em;
  margin: 0 auto 24px;
}
.muted { color: var(--label-2); }
.tag { color: var(--label-2); margin: 0 0 20px; }

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

/* ---- controls ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: var(--target);
  padding: 10px 18px;
  border-radius: var(--r-pill);
  border: 0;
  background: var(--fill);
  color: var(--label);
  font: var(--headline);
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { background: var(--fill-2); text-decoration: none; }
.btn.primary {
  background: var(--accent);
  color: var(--on-accent);
}
.btn.primary:hover { background: var(--accent-press); }
.btn.primary:disabled,
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn.ghost {
  background: transparent;
  border: 1px solid var(--separator);
}
button.back { margin-bottom: 12px; }

.field, .ask textarea, select, input[type="text"], input[type="email"],
input[type="date"], input[type="number"], input[type="search"] {
  width: 100%;
  min-height: var(--target);
  padding: 10px 14px;
  border-radius: var(--r-sm);
  border: 1px solid var(--separator);
  background: var(--bg-elevated);
  color: var(--label);
}
textarea.field { min-height: 96px; resize: vertical; }
.field:focus, textarea:focus, select:focus, input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: transparent;
}
label.lbl {
  display: grid;
  gap: 6px;
  font: var(--subhead);
  color: var(--label-2);
}
.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
@media (min-width: 640px) {
  .form-grid.cols-2 { grid-template-columns: 1fr 1fr; }
  .form-grid.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
}

/* ---- cards / grids ---- */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
@media (min-width: 640px) {
  .grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
  .grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
  .grid.auto { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
}
.card, .tile {
  background: var(--bg-elevated);
  border: 1px solid var(--separator);
  border-radius: var(--r);
  padding: 20px;
  box-shadow: var(--shadow);
}
.tile {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 160px;
  color: var(--label);
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.tile:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.tile .kicker {
  font: var(--footnote);
  color: var(--accent);
  font-weight: 600;
}
.tile h3 { margin: 0; }
.tile p { margin: 0; color: var(--label-2); font: var(--subhead); }
.tile .meta { margin-top: auto; font: var(--caption); color: var(--label-3); }

.section { margin: 48px 0 0; }
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.chip, .badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 10px;
  border-radius: var(--r-pill);
  background: var(--fill);
  font: var(--caption);
  color: var(--label-2);
}
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.badge.on { background: var(--ok-bg); color: var(--ok); }
.badge.off { color: var(--label-3); }
.badge.warn { background: var(--bad-bg); color: var(--bad); }

.empty, .loading, .error, .banner {
  border-radius: var(--r);
  padding: 16px 18px;
  margin: 16px 0;
}
.empty, .loading {
  background: var(--fill);
  color: var(--label-2);
}
.error {
  background: var(--bad-bg);
  color: var(--label);
  border: 1px solid color-mix(in srgb, var(--bad) 40%, transparent);
}
.banner.show, .banner.ok {
  display: block;
  background: var(--ok-bg);
  border: 1px solid color-mix(in srgb, var(--ok) 40%, transparent);
}
.banner { display: none; }

/* ---- article prose (first-party HTML from R2) ---- */
.prose { font: var(--body); max-width: 40em; }
.prose h2 { margin: 1.6em 0 0.5em; }
.prose h3, .prose h4 { margin: 1.3em 0 0.4em; }
.prose p, .prose ul, .prose ol { margin: 0 0 1em; }
.prose pre, .prose code {
  font-family: var(--mono);
  font-size: 0.88em;
}
.prose pre {
  background: var(--bg-grouped);
  border: 1px solid var(--separator);
  border-radius: var(--r-sm);
  padding: 14px 16px;
  overflow-x: auto;
  white-space: pre-wrap;
}
.prose table { width: 100%; border-collapse: collapse; font: var(--subhead); }
.prose th, .prose td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--separator);
  vertical-align: top;
}
.prose .tip-box, .prose .warn-box {
  border-radius: var(--r-sm);
  padding: 14px 16px;
  margin: 16px 0;
}
.prose .tip-box { background: var(--ok-bg); }
.prose .warn-box { background: var(--bad-bg); }
.prose a { text-decoration: underline; }

/* ---- quiz / research leftovers ---- */
.modes { display: grid; gap: 12px; }
.cat, .mode, .opt {
  text-align: left;
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--separator);
  border-radius: var(--r);
  padding: 16px 18px;
  cursor: pointer;
  color: var(--label);
  min-height: var(--target);
}
.cat:hover, .mode:hover, .opt:hover { border-color: var(--accent); }
.opt.sel {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, var(--bg-elevated));
}
.opt.correct { border-color: var(--ok); background: var(--ok-bg); }
.opt.wrong { border-color: var(--bad); background: var(--bad-bg); }
.opt[disabled] { cursor: default; }
.cat .icon { font-size: 1.5rem; }
.cat .name, .mode .name, .stem { font: var(--headline); margin: 6px 0 2px; }
.cat .meta, .mode .meta { color: var(--label-2); font: var(--footnote); }
.quiz-head {
  display: flex;
  justify-content: space-between;
  color: var(--label-2);
  margin-bottom: 12px;
  font: var(--footnote);
  font-variant-numeric: tabular-nums;
}
.actions { display: flex; gap: 12px; margin-top: 18px; flex-wrap: wrap; }
.feedback { margin-top: 16px; padding: 14px 16px; border-radius: var(--r-sm); }
.feedback.ok { background: var(--ok-bg); }
.feedback.bad { background: var(--bad-bg); }
.scorebox { font: var(--large-title); margin: 12px 0 24px; }
.review .item { margin: 10px 0; }

.ask { display: flex; gap: 10px; margin: 18px 0 6px; flex-wrap: wrap; }
.ask textarea { flex: 1 1 420px; min-height: 72px; }
.examples { color: var(--label-2); font: var(--footnote); }
.examples button {
  background: none; border: 0; color: var(--accent); cursor: pointer;
  padding: 4px; min-height: var(--target);
}

.kv { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; }
.kv dt { color: var(--label-2); }
.kv dd { margin: 0; }
.tbl { width: 100%; border-collapse: collapse; font: var(--subhead); }
.tbl th, .tbl td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--separator); }
.scroll-x { overflow-x: auto; }

.layer-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.layer {
  display: flex; align-items: center; gap: 12px; padding: 12px 14px;
  background: var(--bg); border: 1px solid var(--separator); border-radius: var(--r-sm);
}
.layer.dim { opacity: 0.5; }
.layer .num {
  width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center;
  background: var(--fill); font-weight: 700; font-size: 0.85rem;
}
.layer.hit .num { background: var(--accent); color: var(--on-accent); }
.layer .body small { color: var(--label-2); }
.gate, .claim { padding: 10px 0; border-bottom: 1px solid var(--separator); }
.gate { display: flex; gap: 12px; align-items: flex-start; }
.gate .g-name { flex: 0 0 210px; font-weight: 600; }
.meters { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
.meter { text-align: center; padding: 14px; background: var(--bg); border-radius: var(--r-sm); }
.meter .m-val { font: var(--title-1); }
.meter .m-lbl { color: var(--label-2); font: var(--caption); }

/* ---- advocate chat ---- */
.timeline { display: flex; gap: 8px; flex-wrap: wrap; margin: 16px 0; }
.stage {
  padding: 6px 12px;
  border: 1px solid var(--separator);
  border-radius: var(--r-pill);
  font: var(--caption);
  color: var(--label-2);
}
.stage.active { border-color: var(--accent); color: var(--label); }
.stage.done { background: var(--ok); border-color: var(--ok); color: #fff; }
.chat {
  border: 1px solid var(--separator);
  border-radius: var(--r);
  background: var(--bg-elevated);
  padding: 14px;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.msg {
  max-width: 82%;
  padding: 10px 12px;
  border-radius: 16px;
  font: var(--callout);
  white-space: pre-wrap;
}
.msg.agent { align-self: flex-end; background: var(--accent); color: var(--on-accent); }
.msg.bot { align-self: flex-start; background: var(--fill); }
.msg.system { align-self: center; color: var(--label-2); font: var(--footnote); font-style: italic; max-width: 100%; }
.who { font: var(--caption); opacity: 0.8; margin-bottom: 3px; }

.price {
  font: var(--title-1);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
}
.spark { width: 100%; height: 72px; display: block; }

.flight {
  display: grid;
  gap: 6px;
}
.flight .fare { font: var(--title-3); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
  .tile:hover { transform: none; }
}

/* ---- Classic Studio library ------------------------------------------ */
.library-page {
  color-scheme: light;
  --bg: #ffffff;
  --bg-elevated: #ffffff;
  --bg-grouped: #f5f5f7;
  --fill: rgba(29, 29, 31, .055);
  --fill-2: rgba(29, 29, 31, .10);
  --label: #1d1d1f;
  --label-2: #6e6e73;
  --label-3: #86868b;
  --separator: rgba(29, 29, 31, .13);
  --glass: rgba(255, 255, 255, .84);
  --glass-border: rgba(255, 255, 255, .72);
  --shadow: none;
  --shadow-lg: 0 12px 30px rgba(29, 29, 31, .08);
}
.library-page .nav { background: var(--glass); }
.library-page .nav .brand { gap: 8px; text-transform: none; }
.library-page .nav .brand img { width: 24px; height: 24px; flex: 0 0 auto; }
.library-page .page { max-width: 1160px; padding-top: 0; }
.library-intro {
  max-width: 760px;
  padding: clamp(4.5rem, 9vw, 8rem) 0 clamp(3rem, 6vw, 5rem);
}
.library-intro h1 {
  max-width: 14ch;
  margin: 0;
  font-size: clamp(2.8rem, 6vw, 5.25rem);
  font-weight: 620;
  line-height: .98;
  letter-spacing: -.06em;
}
.library-intro .tag { max-width: 48ch; margin: 24px 0 0; font-size: 18px; }
.library-intro .btn { margin-top: 22px; }
.library-kicker {
  margin: 0 0 14px;
  color: var(--label-2);
  font: var(--footnote);
  font-weight: 600;
  letter-spacing: -.01em;
}
.library-page #list {
  gap: 0;
  border-top: 1px solid var(--separator);
}
.library-page .tile {
  min-height: 0;
  padding: 24px;
  border: 0;
  border-bottom: 1px solid var(--separator);
  border-radius: 0;
  box-shadow: none;
}
.library-page .tile:hover {
  transform: none;
  background: #f5f5f7;
  box-shadow: none;
}
.library-page .tile .kicker { color: var(--label-2); }
.library-page .tile h3 { letter-spacing: -.02em; }
.library-page .tile .meta { color: var(--label-3); }
.library-page .loading { border-radius: 12px; }
.library-page .site-foot { max-width: 1160px; }
@media (min-width: 640px) {
  .library-page #list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .library-page .tile:nth-child(odd) { border-right: 1px solid var(--separator); }
}
@media (max-width: 639px) {
  .library-intro { padding-top: 4rem; }
  .library-intro h1 { font-size: clamp(2.7rem, 13vw, 4rem); }
}