/* OpenBoard site — palette lifted from the TUI theme (src/theme.ts):
   logo #C17F53, border #8B7355, subtitle #DCDCDC. */

:root {
  --bg:        #0b0b0d;
  --bg-elev:   #131316;
  --bg-term:   #0e0e11;
  --line:      #23211d;
  --line-soft: #1a1916;
  --accent:    #c17f53;
  --accent-2:  #8b7355;
  --text:      #e7e4df;
  --muted:     #948d82;
  --faint:     #6a6359;
  --ok:        #7fae6e;
  --j:         #b6905f;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --maxw: 1040px;
  --shellw: 1200px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; overflow-x: clip; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  /* faint grid, the kind you'd doodle on graph paper */
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 48px 48px;
  background-position: center top;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

code { font-family: var(--mono); font-size: 0.92em; }

.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--accent); color: #1a1206; padding: 8px 14px; z-index: 50;
}
.skip:focus { left: 12px; top: 12px; }

/* ── nav ───────────────────────────────────────────────── */
.nav {
  max-width: var(--shellw); margin: 0 auto;
  padding: 22px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { display: inline-flex; align-items: baseline; gap: 9px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand-mark { font-family: var(--mono); color: var(--accent); font-weight: 700; letter-spacing: -1px; }
.brand-name { font-family: var(--mono); font-weight: 600; letter-spacing: -0.3px; }
.nav-links { display: flex; align-items: center; gap: 26px; font-size: 0.92rem; }
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-repo { color: var(--accent) !important; font-family: var(--mono); }

/* ── shell: left rail + content ────────────────────────── */
.shell {
  max-width: var(--shellw); margin: 0 auto;
  padding: 4px 24px 0;
  display: flex; align-items: flex-start; gap: 44px;
}
.content { flex: 1 1 auto; min-width: 0; }

.rail {
  flex: 0 0 148px; position: sticky; top: 26px;
  display: flex; flex-direction: column; gap: 4px;
  padding-top: 56px;
}
.rail-label {
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--faint); padding: 0 12px 10px;
}
.rail-tab {
  display: flex; flex-direction: column; gap: 2px; text-align: left;
  background: transparent; border: 0; border-left: 2px solid var(--line);
  padding: 9px 14px; cursor: pointer; color: var(--muted);
  font-family: var(--mono); transition: border-color .12s, color .12s, background .12s;
}
.rail-tab .rail-key { font-size: 0.96rem; font-weight: 600; }
.rail-tab .rail-sub { font-size: 0.7rem; color: var(--faint); letter-spacing: 0.3px; }
.rail-tab:hover { color: var(--text); border-color: var(--accent-2); }
.rail-tab[aria-selected="true"] {
  color: var(--text); border-left-color: var(--accent);
  background: linear-gradient(90deg, rgba(193,127,83,0.07), transparent);
}
.rail-tab[aria-selected="true"] .rail-key { color: var(--accent); }
.rail-tab:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 2px; }
.rail-note {
  margin: 18px 12px 0; font-size: 0.72rem; line-height: 1.5; color: var(--faint);
}
.rail-note a { color: var(--accent-2); }

[role="tabpanel"]:focus { outline: none; }
[role="tabpanel"][hidden] { display: none; }

/* ── hero ──────────────────────────────────────────────── */
.hero {
  padding: 52px 0 40px;
}
.eyebrow {
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 1px;
  text-transform: uppercase; color: var(--accent-2); margin: 0 0 20px;
}
h1 {
  font-size: clamp(2.1rem, 5.2vw, 3.6rem);
  line-height: 1.08; letter-spacing: -1.4px; font-weight: 680;
  margin: 0 0 22px; max-width: 16ch;
}
.lede {
  max-width: 60ch; color: var(--muted); font-size: 1.08rem; margin: 0 0 34px;
}
.lede + .cta-row { margin-bottom: 8px; }

.cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; margin-bottom: 48px; }

.cmd {
  display: flex; align-items: center; gap: 12px; max-width: 100%; min-width: 0;
  background: var(--bg-elev); border: 1px solid var(--line);
  padding: 12px 12px 12px 16px; border-radius: 6px;
  font-family: var(--mono); font-size: 0.9rem;
}
.cmd-prompt { color: var(--accent); flex: 0 0 auto; }
.cmd code { color: var(--text); white-space: nowrap; min-width: 0; overflow-x: auto; }
.cmd-copy, .block-copy {
  font-family: var(--mono); font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.5px;
  background: transparent; color: var(--muted);
  border: 1px solid var(--line); border-radius: 4px; padding: 5px 9px;
  cursor: pointer; transition: color .12s, border-color .12s, background .12s;
}
.cmd-copy:hover, .block-copy:hover { color: var(--accent); border-color: var(--accent-2); }
.cmd-copy.done, .block-copy.done { color: var(--ok); border-color: var(--ok); }

.btn-ghost {
  font-size: 0.92rem; color: var(--muted);
  border-bottom: 1px solid transparent; padding-bottom: 1px;
}
.btn-ghost:hover { color: var(--text); text-decoration: none; border-color: var(--accent-2); }

/* terminal mock */
.term {
  background: var(--bg-term); border: 1px solid var(--line);
  border-radius: 8px; overflow: hidden; max-width: 760px;
  box-shadow: 0 24px 60px -30px rgba(0,0,0,0.8);
}
.term-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 11px 14px; border-bottom: 1px solid var(--line); background: #0c0c0f;
}
.dot { width: 10px; height: 10px; border-radius: 50%; background: #2c2a26; }
.dot:nth-child(1) { background: var(--accent); opacity: .85; }
.term-title { font-family: var(--mono); font-size: 0.76rem; color: var(--faint); margin-left: 8px; }
.term-body {
  margin: 0; padding: 20px 18px; font-family: var(--mono);
  font-size: 0.86rem; line-height: 1.85; color: var(--muted);
  overflow-x: auto;
}
.term-body .l { color: var(--text); }
.term-body .p { color: var(--accent); }
.term-body .o { color: var(--muted); }
.term-body .ok { color: var(--ok); }
.term-body .cur { color: var(--text); }
.blink { color: var(--accent); animation: blink 1.05s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* real TUI screenshot (2x asset; capped so it never upscales) */
.shot { margin: 0; max-width: 460px; }
.tui-shot {
  display: block; width: 100%; height: auto; max-width: 100%;
  filter: drop-shadow(0 22px 44px rgba(0,0,0,0.55));
}
.shot figcaption {
  margin-top: 14px; font-family: var(--mono); font-size: 0.78rem; color: var(--faint);
}
.shot figcaption code { color: var(--accent-2); }

/* ── bands ─────────────────────────────────────────────── */
.band {
  padding: 52px 0;
  border-top: 1px solid var(--line-soft);
}
h2 {
  font-family: var(--mono); font-size: 1.05rem; font-weight: 600;
  letter-spacing: 0.2px; color: var(--text); margin: 0 0 32px;
}
h2 .hash { color: var(--accent); margin-right: 8px; }

/* pipeline */
.pipe { list-style: none; margin: 0; padding: 0; display: grid; gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); border-radius: 8px; overflow: hidden; }
.pipe li { background: var(--bg); padding: 22px 24px; display: grid; grid-template-columns: 54px 1fr; grid-template-rows: auto auto; column-gap: 8px; }
.pipe .step { grid-row: 1 / 3; font-family: var(--mono); font-size: 1.1rem; color: var(--accent); padding-top: 2px; }
.pipe b { font-family: var(--mono); font-weight: 600; font-size: 0.98rem; }
.pipe p { margin: 6px 0 0; color: var(--muted); font-size: 0.95rem; }
@media (min-width: 720px) { .pipe { grid-template-columns: repeat(4, 1fr); } .pipe li { grid-template-columns: 1fr; grid-template-rows: auto auto auto; } .pipe .step { grid-row: auto; } }

/* feature grid */
.grid { display: grid; gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); border-radius: 8px; overflow: hidden; grid-template-columns: 1fr; }
@media (min-width: 620px) { .grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 920px) { .grid { grid-template-columns: 1fr 1fr 1fr; } }
.card { background: var(--bg); padding: 26px 24px; }
.card h3 { font-family: var(--mono); font-size: 0.98rem; font-weight: 600; margin: 0 0 10px; color: var(--text); }
.card h3::before { content: "› "; color: var(--accent); }
.card p { margin: 0; color: var(--muted); font-size: 0.94rem; }
.card code { color: var(--accent); background: rgba(193,127,83,0.08); padding: 1px 5px; border-radius: 3px; }

/* code block */
.note { color: var(--faint); font-family: var(--mono); font-size: 0.82rem; margin: -16px 0 18px; }
.code-block { position: relative; background: var(--bg-term); border: 1px solid var(--line); border-radius: 8px; }
.code-block pre { margin: 0; padding: 22px 20px; overflow-x: auto; font-family: var(--mono); font-size: 0.88rem; line-height: 1.8; color: var(--text); }
.code-block .c { color: var(--faint); }
.block-copy { position: absolute; top: 12px; right: 12px; }
.stack { margin: 26px 0 0; color: var(--muted); font-size: 0.95rem; }
.stack b { color: var(--text); font-weight: 600; }

/* ── footer ────────────────────────────────────────────── */
.foot { max-width: var(--shellw); margin: 0 auto; padding: 40px 24px 64px; border-top: 1px solid var(--line-soft); }
.foot-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; }
.foot-row .brand-name { color: var(--text); }
.foot-row nav { display: flex; gap: 22px; font-family: var(--mono); font-size: 0.86rem; }
.foot-row nav a { color: var(--muted); }
.foot-row nav a:hover { color: var(--accent); text-decoration: none; }
.foot-meta { margin: 22px 0 0; color: var(--faint); font-size: 0.84rem; }
.foot-count { margin: 8px 0 0; font-family: var(--mono); font-size: 0.8rem; color: var(--muted); }

/* ── agent view ────────────────────────────────────────── */
h3.sub {
  font-family: var(--mono); font-size: 0.9rem; font-weight: 600;
  color: var(--text); margin: 28px 0 12px;
}
h3.sub::before { content: "› "; color: var(--accent); }
.band > h3.sub:first-of-type { margin-top: 0; }

.term-body .j { color: var(--j); }
.term-body .l { white-space: pre; }

.flow {
  margin: 0 0 18px; padding: 20px; overflow-x: auto;
  background: var(--bg-term); border: 1px solid var(--line); border-radius: 8px;
  font-family: var(--mono); font-size: 0.86rem; line-height: 1.9; color: var(--text);
}
.flow .o { color: var(--muted); }
.flow .ar { color: var(--accent); }

.grid.two { grid-template-columns: 1fr; }
@media (min-width: 720px) { .grid.two { grid-template-columns: 1fr 1fr; } }
.json-card { padding: 0; }
.json-card h3 {
  margin: 0; padding: 14px 18px; border-bottom: 1px solid var(--line-soft);
  font-family: var(--mono); font-size: 0.82rem; color: var(--muted);
}
.json-card h3::before { content: ""; }
.json-card pre { margin: 0; padding: 16px 18px; overflow-x: auto; font-size: 0.82rem; line-height: 1.7; }
.json-card .j { color: var(--j); }

.inline-tab {
  font: inherit; color: var(--accent); background: rgba(193,127,83,0.08);
  border: 1px solid var(--line); border-radius: 3px; padding: 0 6px; cursor: pointer;
}
.inline-tab:hover { border-color: var(--accent-2); }

/* ── responsive: rail → top segmented control ──────────── */
@media (max-width: 820px) {
  .shell { flex-direction: column; align-items: stretch; gap: 0; padding-top: 0; }
  .rail {
    position: sticky; top: 0; z-index: 20; flex-basis: auto; width: 100%;
    flex-direction: row; align-items: stretch; gap: 0; padding: 0;
    background: rgba(11,11,13,0.92); backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line); margin: 0 -24px 8px; padding: 0 24px;
  }
  .rail-label, .rail-note { display: none; }
  .rail-tab {
    flex: 1 1 50%; flex-direction: row; align-items: baseline; gap: 8px;
    border-left: 0; border-bottom: 2px solid transparent; padding: 13px 6px; justify-content: center;
  }
  .rail-tab[aria-selected="true"] { border-bottom-color: var(--accent); background: none; }
  .rail-tab .rail-sub { display: none; }
  .hero { padding-top: 32px; }
}

/* ── phones ────────────────────────────────────────────── */
@media (max-width: 540px) {
  .nav { padding: 18px 18px; }
  .nav-links { gap: 14px; font-size: 0.82rem; }

  .shell { padding-left: 18px; padding-right: 18px; }
  .rail { margin-left: -18px; margin-right: -18px; padding-left: 18px; padding-right: 18px; }
  .foot { padding-left: 18px; padding-right: 18px; }

  h1 { font-size: clamp(1.8rem, 8.5vw, 2.7rem); letter-spacing: -0.6px; }
  .lede { font-size: 1rem; }
  .hero { padding-top: 24px; padding-bottom: 28px; }
  .band { padding: 40px 0; }

  /* hero command wraps instead of forcing the page wide */
  .cmd { flex-wrap: wrap; gap: 8px 10px; width: 100%; }
  .cmd code { white-space: normal; overflow-wrap: anywhere; overflow-x: visible; }
  .cmd-copy { margin-left: auto; }

  .eyebrow { font-size: 0.72rem; }
  .term-body, .flow, .code-block pre, .json-card pre { font-size: 0.76rem; }
  .foot-row nav { gap: 16px; row-gap: 8px; flex-wrap: wrap; }
}

/* very small / older phones */
@media (max-width: 360px) {
  .nav-links a:not(.nav-repo) { display: none; }
  h1 { font-size: clamp(1.6rem, 9vw, 2.2rem); }
}

/* guards: media never widens the layout */
.term, .flow, .code-block, pre { max-width: 100%; }

@media (prefers-reduced-motion: reduce) { .blink { animation: none; } html { scroll-behavior: auto; } }