/* go.longervision.ca — ported from the longervision.ca design system
   (assets/css/main.css). Tokens, typography, buttons, header and footer
   are kept 1:1 so the two sites read as one product.

   Palette: engineering notebook on paper, PCB green + copper traces.
   Display: Space Grotesk · Body: system stack · Mono: JetBrains Mono */

:root {
  --ink: #15241f;
  --ink-soft: #44544d;
  --paper: #fafaf7;
  --surface: #ffffff;
  --mist: #eceee7;
  --line: #d8dcd2;
  --pcb: #0b6b4f;
  --pcb-deep: #07523c;
  --pcb-tint: #e3f1ea;
  --copper: #b06a2c;
  --copper-tint: #f6e9da;
  --term-bg: #102019;
  --term-fg: #9fe0c3;
  --danger: #a02218;
  --radius: 10px;
  --radius-lg: 16px;
  --font-display: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e7ece8;
    --ink-soft: #a8b4ad;
    --paper: #121a16;
    --surface: #18231e;
    --mist: #1d2a24;
    --line: #2c3a33;
    --pcb: #3fbf93;
    --pcb-deep: #5cd1a8;
    --pcb-tint: #173228;
    --copper: #d99553;
    --copper-tint: #33271a;
    --term-bg: #0c1511;
    --term-fg: #8fd8ba;
    --danger: #e0685c;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
}
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.15; margin: 0 0 .5em; letter-spacing: -0.01em; }
h1 { font-size: 1.55rem; font-weight: 700; }
p { margin: 0 0 1em; }
a { color: var(--pcb); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
code, pre, kbd { font-family: var(--font-mono); }
:focus-visible { outline: 3px solid var(--copper); outline-offset: 2px; border-radius: 4px; }
img { max-width: 100%; height: auto; }
button, input, select { font: inherit; }

/* ---------- Eyebrow (the "// section" kicker) ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--copper);
  letter-spacing: .02em;
  margin: 0 0 .7rem;
}
.muted { color: var(--ink-soft); }
.tiny { font-size: .78rem; }

/* ---------- Buttons (from .ca) ---------- */
.btn {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: .95rem;
  padding: .7rem 1.4rem;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .12s ease, background .15s ease, border-color .15s ease, color .15s ease, opacity .15s ease;
  background: none;
  color: var(--ink);
}
.btn:hover:not(:disabled) { text-decoration: none; transform: translateY(-1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: var(--pcb); color: #f3faf6; }
.btn-primary:hover:not(:disabled) { background: var(--pcb-deep); }
.btn-ghost { border-color: var(--line); color: var(--ink); background: transparent; }
.btn-ghost:hover:not(:disabled) { border-color: var(--pcb); color: var(--pcb); }
.btn-danger { border-color: var(--line); color: var(--danger); background: transparent; }
.btn-danger:hover:not(:disabled) { border-color: var(--danger); }
.btn-sm { padding: .45rem .85rem; font-size: .85rem; }
.btn-block { width: 100%; margin-top: 14px; }
.btn-compact { margin-top: 10px; padding: .55rem 1rem; width: 100%; }

/* ---------- Header / nav (from .ca .site-header) ---------- */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap {
  display: flex; align-items: center; gap: 1.2rem;
  min-height: 64px;
  max-width: 1360px; margin: 0 auto; padding: 0 24px;
}
.brand {
  display: flex; align-items: center; gap: .55rem;
  font-family: var(--font-display); font-weight: 700; font-size: 1.05rem;
  color: var(--ink); white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand em { font-style: normal; color: var(--pcb); }
.brand-mark { width: 32px; height: 32px; display: block; }
.site-nav { display: flex; align-items: center; gap: .15rem; }
.nav-link {
  display: inline-flex; align-items: center; gap: .35rem;
  font-family: var(--font-display); font-size: .92rem; font-weight: 500;
  color: var(--ink); background: none; border: 0; cursor: pointer;
  padding: .5rem .7rem; border-radius: 8px;
}
.nav-link:hover { background: var(--mist); text-decoration: none; }
.nav-right { display: flex; align-items: center; gap: .7rem; margin-left: auto; }

/* Engine status pill — styled like a terminal chip */
.badge {
  font: 500 .72rem var(--font-mono);
  color: var(--term-fg);
  background: var(--term-bg);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .34rem .75rem;
  max-width: 300px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.badge.ok::before { content: "●"; margin-right: .45rem; color: #3fbf93; }

.user-chip {
  display: inline-flex; align-items: center; gap: .55rem;
  font-family: var(--font-display); font-size: .85rem;
  padding: .32rem .4rem .32rem .8rem;
  border: 1px solid var(--line); border-radius: 999px; background: var(--surface);
}
.user-chip .pts {
  font: 500 .7rem var(--font-mono);
  color: var(--pcb-deep); background: var(--pcb-tint);
  border-radius: 999px; padding: .15rem .55rem;
}

/* ---------- Layout ---------- */
.layout {
  width: min(1360px, calc(100% - 32px));
  margin: 26px auto;
  display: grid;
  grid-template-columns: minmax(500px, 1fr) 360px;
  gap: 26px;
  align-items: start;
  flex: 1;
}
.board-panel { position: relative; min-width: 0; display: grid; place-items: center; }
#board {
  display: block;
  width: min(100%, calc(100vh - 130px));
  aspect-ratio: 1;
  border-radius: var(--radius);
  box-shadow: 0 24px 50px rgba(10, 30, 22, .18), inset 0 0 0 1px rgba(0, 0, 0, .2);
  cursor: crosshair;
  touch-action: manipulation;
}
.thinking {
  position: absolute; left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  padding: .75rem 1.15rem;
  border-radius: 999px;
  font: 500 .82rem var(--font-mono);
  color: var(--term-fg);
  background: color-mix(in srgb, var(--term-bg) 92%, transparent);
  backdrop-filter: blur(8px);
  box-shadow: 0 10px 30px rgba(10, 30, 22, .3);
}
.hidden { display: none !important; }

/* ---------- Cards (from .ca .course-card family) ---------- */
.sidebar { display: grid; gap: 14px; }
.card {
  padding: 1.15rem 1.3rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: border-color .15s ease;
}
.card > p { margin: 0 0 1rem; font-size: .9rem; }
.card > p.eyebrow { margin-bottom: .7rem; }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-stack { display: grid; gap: 12px; padding: 1.3rem; }
label {
  display: grid; gap: .35rem;
  font-family: var(--font-display); font-weight: 500; font-size: .8rem;
  color: var(--ink-soft);
}
select, input {
  width: 100%;
  font-family: var(--font-body); font-weight: 400;
  color: var(--ink); background: var(--paper);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: .6rem .7rem;
}
select:focus-visible, input:focus-visible { outline: 2px solid var(--pcb); outline-offset: 1px; }

.actions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.actions .btn { padding: .6rem .4rem; font-size: .85rem; text-align: center; }

.status-card { display: grid; gap: .45rem; }
.status-row { display: flex; justify-content: space-between; gap: 16px; font-size: .88rem; }
.status-row span { color: var(--ink-soft); }
.status-row strong { font-variant-numeric: tabular-nums; font-family: var(--font-display); font-weight: 500; }
.message {
  margin: .4rem 0 0 !important;
  padding-top: .7rem;
  border-top: 1px solid var(--line);
  min-height: 2.2rem;
  font-size: .86rem;
}
.message.error { color: var(--danger); }

#hints { margin: 0; padding-left: 1.4rem; display: grid; gap: .5rem; font-variant-numeric: tabular-nums; font-size: .9rem; }
#hints strong { font-family: var(--font-mono); font-weight: 500; color: var(--pcb-deep); }
#hints li span { color: var(--ink-soft); font-size: .78rem; margin-left: .4rem; }

/* ---------- Review ---------- */
.review-controls { display: flex; align-items: center; gap: 8px; margin-bottom: .8rem; }
.review-controls input[type="range"] { flex: 1; padding: 0; accent-color: var(--pcb); }
.review-controls .btn { padding: .35rem .6rem; }

/* ---------- History ---------- */
.history { margin: 0; padding: 0; list-style: none; display: grid; gap: 6px; max-height: 260px; overflow-y: auto; }
.history li { font-size: .84rem; }
.history .btn {
  width: 100%;
  display: flex; justify-content: space-between; gap: 10px;
  padding: .5rem .7rem; font-size: .8rem;
  font-family: var(--font-body); font-weight: 400;
  border: 1px solid var(--line); border-radius: var(--radius);
  text-align: left; background: var(--surface);
}
.history .btn:hover { border-color: var(--pcb); transform: none; }
.history .h-result { font: 500 .72rem var(--font-mono); color: var(--pcb-deep); white-space: nowrap; }
.history .h-result.open { color: var(--copper); }

/* ---------- Modal ---------- */
.modal {
  position: fixed; inset: 0; z-index: 80;
  display: grid; place-items: center; padding: 20px;
  background: rgba(16, 32, 25, .5);
  backdrop-filter: blur(4px);
}
.modal-card {
  width: min(400px, 100%);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 50px rgba(10, 30, 22, .25);
  overflow: hidden;
}
.modal-tabs { display: flex; align-items: center; border-bottom: 1px solid var(--line); background: var(--mist); }
.tab {
  border: 0; border-radius: 0; background: transparent; cursor: pointer;
  padding: .85rem 1.1rem;
  font-family: var(--font-display); font-weight: 500; color: var(--ink-soft);
}
.tab.active { color: var(--pcb-deep); box-shadow: inset 0 -2px 0 var(--pcb); }
.modal-close {
  margin-left: auto; border: 0; background: transparent; cursor: pointer;
  font-size: 1.3rem; line-height: 1; padding: .5rem .9rem; color: var(--ink-soft);
}

/* ---------- Footer (from .ca .site-footer) ---------- */
.site-footer { background: var(--ink); color: #c9d4ce; margin-top: 3rem; }
@media (prefers-color-scheme: dark) { .site-footer { background: #0c1310; } }
.site-footer a { color: #c9d4ce; }
.site-footer a:hover { color: #5cd1a8; }
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 2rem;
  max-width: 1120px; margin: 0 auto; padding: 3rem 24px 2rem;
}
.footer-logo { display: flex; align-items: center; gap: .6rem; font: 700 1.1rem var(--font-display); color: #f0f5f2; margin: 0 0 .3rem; }
.footer-logo img { display: block; }
.footer-logo em { font-style: normal; color: #5cd1a8; }
.footer-tag { font-family: var(--font-mono); font-size: .82rem; color: #7d918a; margin: 0 0 .4em; }
.footer-meta { font-size: .85rem; color: #7d918a; margin: 0; }
.footer-head { font: 500 .8rem var(--font-mono); color: #7d918a; letter-spacing: .06em; margin: 0 0 .7rem; }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: .45rem; }
.footer-col a { font-size: .92rem; }
.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
  border-top: 1px solid rgba(255, 255, 255, .1);
  max-width: 1120px; margin: 0 auto;
  padding: 1.2rem 24px 1.6rem;
  font-size: .82rem; color: #7d918a;
}
.footer-bottom p { margin: 0; }
.footer-bottom a { color: #a8bbb2; }
.footer-support a { margin-left: 1.2rem; }
.footer-support a:first-child { margin-left: 0; }
.footer-license { flex-basis: 100%; font-family: var(--font-mono); font-size: .72rem; color: #5d6f68; }

/* ---------- Responsive ---------- */
@media (max-width: 1020px) {
  .layout { grid-template-columns: 1fr; width: min(760px, calc(100% - 24px)); }
  #board { width: 100%; }
  .site-nav { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav-wrap { padding: 0 14px; gap: .6rem; }
  .badge { max-width: 130px; }
  .layout { margin-top: 12px; gap: 14px; }
  .footer-grid { grid-template-columns: 1fr; gap: 1.4rem; }
  .footer-bottom { flex-direction: column; }
  .footer-support a { margin-left: 0; margin-right: 1.2rem; }
}