/* Need-to-Know: minimal and editorial. White paper, graphite ink, one cobalt accent for
   everything that moves or that you can read. Red only for leaks. */
:root {
  --bg: #FAFAF9; --card: #FFFFFF; --soft: #F3F4F6; --edge: #E6E7EA; --edge-2: #D5D8DE;
  --ink: #111318; --muted: #626875; --faint: #9AA0AB;
  --accent: #2F54EB; --accent-ink: #FFFFFF; --accent-soft: #EEF2FF; --accent-line: rgba(47, 84, 235, 0.35);
  --lock: #6B7280; --lock-bg: #F4F5F7; --bad: #D93F3F; --bad-soft: #FDEEEE; --ok: #1E8E5A; --ok-soft: #EAF6EF; --warn: #A86507; --warn-soft: #FCF3E3;
  --display: "Sora", "Geist", system-ui, sans-serif;
  --sans: "Geist", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Geist Mono", ui-monospace, Consolas, monospace;
  --r: 14px;
  color-scheme: light;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; min-height: 100%; }
body { background: var(--bg); color: var(--ink); font: 15px/1.6 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
h1, h2, h3, h4 { margin: 0; line-height: 1.15; font-family: var(--display); font-weight: 600; letter-spacing: -0.02em; text-wrap: balance; }
h1 { font-size: clamp(28px, 3.4vw, 42px); }
h2 { font-size: 15px; font-family: var(--sans); letter-spacing: 0; }
h3 { font-size: 16px; letter-spacing: -0.01em; }
h4 { font-size: 11px; font-family: var(--mono); font-weight: 500; letter-spacing: .08em; text-transform: uppercase; color: var(--faint); }
p { margin: 0; }
a { color: var(--accent); }
button, select, input { font: inherit; color: inherit; }
button { cursor: pointer; }
select { background: var(--card); border: 1px solid var(--edge); border-radius: 10px; padding: 7px 10px; color: var(--ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
svg { width: 18px; height: 18px; flex: none; }
.muted { color: var(--muted); }
.tiny { font-size: 12px; }
.row { display: flex; align-items: center; flex-wrap: wrap; }
.gap { gap: 10px; }
code { font-family: var(--mono); font-size: 12px; background: var(--soft); padding: 1px 6px; border-radius: 6px; }

/* background: a quiet dot grid and one faint blue haze at the top */
.aurora { position: fixed; inset: 0; z-index: 0; pointer-events: none; background: radial-gradient(60% 40% at 55% -5%, rgba(47,84,235,.07), transparent 70%); }
.aurora i { display: none; }
.grid-bg { position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image: radial-gradient(rgba(17,19,24,.09) 1px, transparent 1px); background-size: 24px 24px;
  mask-image: linear-gradient(to bottom, #000, transparent 70%); -webkit-mask-image: linear-gradient(to bottom, #000, transparent 70%); }

/* layout */
.app { position: relative; z-index: 1; display: grid; grid-template-columns: 232px minmax(0, 1fr); min-height: 100vh; background: linear-gradient(to right, rgba(255,255,255,.7) 0 231px, var(--edge) 231px 232px, transparent 232px); }
.side { padding: 22px 14px; display: flex; flex-direction: column; gap: 26px; position: sticky; top: 0; height: 100vh; }
.logo { display: flex; align-items: center; gap: 10px; padding: 0 8px; font: 600 16px var(--display); letter-spacing: -0.01em; }
.mark { display: grid; gap: 3px; width: 18px; }
.mark i { display: block; height: 3.5px; border-radius: 2px; background: var(--ink); }
.mark i:nth-child(2) { width: 60%; background: var(--accent); }
.mark i:nth-child(3) { width: 80%; }
.nav { display: flex; flex-direction: column; gap: 2px; }
.nav button { display: flex; align-items: center; gap: 11px; border: 0; background: none; padding: 9px 12px; border-radius: 10px; color: var(--muted); font-weight: 500; text-align: left; transition: background .15s, color .15s; }
.nav button:hover { background: var(--soft); color: var(--ink); }
.nav button.on { background: var(--ink); color: #fff; }
.side-foot { margin-top: auto; display: flex; flex-direction: column; gap: 10px; padding: 0 8px; }
.field { display: flex; flex-direction: column; gap: 5px; font-size: 12px; color: var(--muted); }
.text-btn { border: 0; background: none; padding: 0; color: var(--faint); text-align: left; text-decoration: underline; text-underline-offset: 3px; }
#status::before { content: ""; display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--ok); margin-right: 7px; vertical-align: 1px; }
.main { min-width: 0; display: flex; flex-direction: column; }
.bar { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 14px 32px; position: sticky; top: 0; z-index: 6; background: rgba(250,250,249,.82); border-bottom: 1px solid var(--edge); backdrop-filter: blur(10px); }
.viewer { display: flex; align-items: center; gap: 10px; position: relative; }
.who { display: flex; align-items: center; gap: 9px; border: 1px solid var(--edge); background: var(--card); border-radius: 999px; padding: 4px 14px 4px 4px; transition: border-color .15s; }
.who:hover { border-color: var(--ink); }
.who b { font-weight: 600; font-size: 14px; }
.who small { color: var(--muted); font-size: 12px; }
.av { width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; font-size: 11px; font-weight: 600; flex: none; background: var(--ink); color: #fff; }
.av.bot { border-radius: 8px; background: var(--card); color: var(--ink); border: 1.5px solid var(--ink); }
.menu { position: absolute; right: 0; top: calc(100% + 8px); width: 300px; max-height: 440px; overflow: auto; z-index: 20; padding: 6px; background: var(--card); border: 1px solid var(--edge); border-radius: var(--r); box-shadow: 0 18px 50px rgba(17,19,24,.12); }
.menu button { display: flex; gap: 10px; align-items: center; width: 100%; border: 0; background: none; padding: 9px; border-radius: 10px; text-align: left; }
.menu button:hover, .menu button.on { background: var(--soft); }
.menu span { display: flex; flex-direction: column; line-height: 1.3; }
.menu small { color: var(--muted); font-size: 12px; }
.view { padding: 28px 32px 56px; display: flex; flex-direction: column; gap: 18px; }
.view.narrow, .col-narrow { max-width: 860px; width: 100%; margin: 0 auto; }
.col-narrow { display: flex; flex-direction: column; gap: 16px; }
#notice { padding: 0 32px; }
.notice { margin: 16px auto 0; max-width: 1100px; border: 1px solid var(--edge); background: var(--card); border-radius: 12px; padding: 10px 14px; font-size: 13px; color: var(--muted); }

/* the brain stage */
.ask-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; flex-wrap: wrap; }
.stage-copy { max-width: 620px; display: flex; flex-direction: column; gap: 10px; }
.stage-copy p { color: var(--muted); }
.kicker { display: inline-flex; align-items: center; gap: 8px; font: 500 11px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.kicker .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
@media (prefers-reduced-motion: no-preference) { .kicker .dot { animation: beat 1.8s ease-in-out infinite; } @keyframes beat { 50% { transform: scale(1.7); opacity: .4; } } }
#hero-title { color: var(--ink); }
.pills { display: flex; flex-wrap: wrap; gap: 6px; justify-content: flex-end; max-width: 440px; }
.pills span { font-size: 12px; border: 1px solid var(--edge); background: var(--card); border-radius: 999px; padding: 3px 10px; color: var(--muted); }
.pills b { color: var(--ink); font-weight: 600; }
.stage { position: relative; border: 1px solid var(--edge); border-radius: 22px; overflow: hidden; min-height: 600px; background: var(--card); box-shadow: 0 1px 0 rgba(17,19,24,.03), 0 24px 60px -30px rgba(17,19,24,.18); }
.brain { position: absolute; inset: 0; }
.brain canvas { display: block; }
.brain-tip { position: absolute; z-index: 3; pointer-events: none; font-size: 12px; padding: 5px 9px; border-radius: 8px; background: var(--ink); color: #fff; white-space: nowrap; }
.legend { position: absolute; left: 0; right: 0; bottom: 16px; z-index: 2; display: flex; flex-wrap: wrap; justify-content: center; gap: 18px; font-size: 12px; color: var(--muted); pointer-events: none; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 8px; height: 8px; border-radius: 50%; }

/* ask */
.hero { display: flex; flex-direction: column; gap: 8px; }
.hero.left p { max-width: 64ch; }
.ask { display: flex; gap: 8px; border: 1px solid var(--edge-2); border-radius: 16px; padding: 7px 7px 7px 18px; background: var(--card); box-shadow: 0 10px 30px -18px rgba(17,19,24,.25); transition: border-color .2s, box-shadow .2s; position: relative; z-index: 3; }
.ask:focus-within { border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.ask input { flex: 1; min-width: 0; border: 0; outline: 0; background: none; padding: 10px 0; font-size: 16px; }
.ask input::placeholder { color: var(--faint); }
.ask button { border: 0; border-radius: 11px; padding: 0 18px; display: flex; align-items: center; gap: 8px; font-weight: 600; background: var(--ink); color: #fff; transition: background .15s; }
.ask button:hover { background: var(--accent); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.chip { border: 1px solid var(--edge); background: var(--card); border-radius: 999px; padding: 6px 13px; font-size: 13px; color: var(--muted); transition: all .15s; }
.chip:hover { color: var(--accent); border-color: var(--accent-line); }
#thread { display: flex; flex-direction: column; gap: 22px; padding-top: 4px; }
.qline { align-self: flex-end; border-radius: 16px 16px 4px 16px; padding: 10px 15px; max-width: 80%; background: var(--ink); color: #fff; }
.answer { border: 1px solid var(--edge); border-radius: var(--r); background: var(--card); padding: 22px 24px; display: flex; flex-direction: column; gap: 16px; box-shadow: 0 1px 0 rgba(17,19,24,.03); }
.thinking { display: flex; align-items: center; gap: 10px; color: var(--muted); }
.thinking i { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
@media (prefers-reduced-motion: no-preference) { .thinking i { animation: beat 1s ease-in-out infinite; } .thinking i:nth-child(2) { animation-delay: .15s; } .thinking i:nth-child(3) { animation-delay: .3s; } }
.a-head { display: flex; align-items: center; gap: 9px; font-size: 13px; color: var(--muted); }
.a-head b { color: var(--ink); }
.a-text { font-size: 17px; line-height: 1.65; }
.block { display: flex; flex-direction: column; gap: 8px; }
.src { display: flex; gap: 11px; align-items: flex-start; border: 1px solid var(--edge); border-radius: 12px; padding: 12px 14px; transition: border-color .15s; }
.src:hover { border-color: var(--accent-line); }
.src svg { color: var(--accent); margin-top: 3px; }
.src .t { font-weight: 600; }
.src .m { font-size: 12px; color: var(--faint); }
.src.leak { border-color: var(--bad); background: var(--bad-soft); }
.src.leak svg { color: var(--bad); }
.locked { display: flex; gap: 11px; align-items: flex-start; border-radius: 12px; padding: 12px 14px; font-size: 14px; color: var(--lock); background: var(--lock-bg); }
.locked b { color: var(--ink); font-weight: 600; }
.locked svg { margin-top: 2px; }
.people { display: flex; flex-wrap: wrap; gap: 7px; }
.person { display: inline-flex; align-items: center; gap: 7px; border: 1px solid var(--edge); border-radius: 999px; padding: 3px 11px 3px 3px; font-size: 13px; }
.person .av { width: 22px; height: 22px; font-size: 9px; }
.note-line { font-size: 13px; color: var(--muted); border-left: 2px solid var(--edge-2); padding: 2px 0 2px 11px; }
details.why summary { cursor: pointer; font-size: 13px; color: var(--accent); list-style: none; font-weight: 500; }
details.why summary::-webkit-details-marker { display: none; }
details.why[open] summary { margin-bottom: 10px; }
.chain { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: 13px; margin-bottom: 6px; }
.chain span { border: 1px solid var(--edge); border-radius: 7px; padding: 2px 9px; }
.chain span:first-child { background: var(--ink); color: #fff; border-color: var(--ink); }
.chain span.end { border-color: var(--accent-line); color: var(--accent); background: var(--accent-soft); }
.chain i { font-style: normal; color: var(--faint); }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.split .answer { padding: 16px; gap: 12px; }
.split .a-text { font-size: 14px; }
.badge { display: inline-flex; align-items: center; gap: 5px; border-radius: 999px; padding: 3px 10px; font-size: 12px; font-weight: 500; }
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.bad { background: var(--bad-soft); color: var(--bad); }
.badge.warn { background: var(--warn-soft); color: var(--warn); }
.badge.lock { background: var(--lock-bg); color: var(--lock); }

/* panels, buttons, lists */
.btn { border: 1px solid var(--edge-2); background: var(--card); border-radius: 11px; padding: 10px 18px; font-weight: 500; transition: all .15s; }
.btn:hover { border-color: var(--ink); }
.btn.primary { border-color: var(--ink); background: var(--ink); color: #fff; font-weight: 600; }
.btn.primary:hover { background: var(--accent); border-color: var(--accent); }
.btn.good { border-color: var(--ok); background: var(--ok); color: #fff; font-weight: 600; }
.card { border: 1px solid var(--edge); border-radius: var(--r); background: var(--card); padding: 22px 24px; display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }
.stats { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
.stat { border: 1px solid var(--edge); border-radius: 14px; padding: 14px 16px; background: var(--card); }
.stat b { display: block; font: 600 30px var(--display); letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.stat:first-child b { color: var(--accent); }
.stat span { font-size: 12px; color: var(--muted); }
.list { display: flex; flex-direction: column; }
.list > div { display: flex; justify-content: space-between; gap: 12px; padding: 9px 0; border-bottom: 1px solid var(--edge); font-size: 14px; }
.list > div:last-child { border-bottom: 0; }
.list .r { color: var(--muted); text-align: right; flex: none; max-width: 48%; font-size: 13px; }
.steps { display: grid; gap: 14px; }
.step { display: grid; grid-template-columns: 32px minmax(0, 1fr); gap: 14px; }
.num { width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; font: 600 13px var(--display); color: #fff; background: var(--ink); }
.checks { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 7px; }
.note { border: 1px solid var(--edge); border-radius: 12px; padding: 12px 14px; font-size: 14px; display: flex; flex-direction: column; gap: 4px; }
.note .who-line { font-size: 12px; color: var(--faint); }
.note.leak { border-color: var(--bad); background: var(--bad-soft); }
.reply { border-radius: 12px; padding: 16px; font-size: 14px; background: var(--soft); }
.reply.leak { background: var(--bad-soft); outline: 1px solid var(--bad); }
.meter { display: grid; grid-template-columns: 120px minmax(0, 1fr) 44px; gap: 10px; align-items: center; font-size: 13px; }
.track { height: 6px; background: var(--soft); border-radius: 3px; overflow: hidden; }
.fill { display: block; height: 100%; border-radius: 3px; background: var(--bad); }
.fill.ok { background: var(--ink); }
@media (prefers-reduced-motion: no-preference) { .fill { animation: grow .9s cubic-bezier(.2,.8,.2,1) both; } @keyframes grow { from { width: 0 !important; } } }
.meter b { text-align: right; font-variant-numeric: tabular-nums; }
.result { border-radius: 12px; padding: 13px 15px; font-size: 14px; display: flex; flex-direction: column; gap: 6px; }
.result.pass { background: var(--ok-soft); }
.result.fail { background: var(--bad-soft); }
table.t { width: 100%; border-collapse: collapse; font-size: 14px; }
.t th, .t td { text-align: left; padding: 11px 8px; border-bottom: 1px solid var(--edge); }
.t th { font: 500 11px var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--faint); }
.t td.n { font-variant-numeric: tabular-nums; font-weight: 600; }
.tbl { overflow-x: auto; }
.spin { opacity: .55; pointer-events: none; transition: opacity .2s; }
@media (prefers-reduced-motion: no-preference) {
  .answer, .card, .step, .stat { animation: rise .4s cubic-bezier(.2,.8,.2,1) both; }
  .grid > *:nth-child(2), .stats > *:nth-child(2) { animation-delay: .04s; }
  .grid > *:nth-child(3), .stats > *:nth-child(3) { animation-delay: .08s; }
  .grid > *:nth-child(4), .stats > *:nth-child(4) { animation-delay: .12s; }
  .stats > *:nth-child(5) { animation-delay: .16s; } .stats > *:nth-child(6) { animation-delay: .2s; }
  @keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
}

@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; background: none; }
  .side { position: static; height: auto; flex-direction: row; flex-wrap: wrap; align-items: center; gap: 10px; padding: 12px 16px; background: rgba(255,255,255,.7); border-bottom: 1px solid var(--edge); }
  .nav { flex-direction: row; overflow-x: auto; width: 100%; order: 3; }
  .nav button { white-space: nowrap; padding: 8px 11px; }
  .side-foot { margin: 0 0 0 auto; flex-direction: row; align-items: center; padding: 0; }
  .side-foot #status, .side-foot .text-btn { display: none; }
  .bar { padding: 10px 16px; position: static; }
  .bar h2 { display: none; }
  .viewer { width: 100%; justify-content: space-between; }
  .view { padding: 16px 16px 40px; }
  #notice { padding: 0 16px; }
  .stage { min-height: 360px; }
  .pills { justify-content: flex-start; }
  .split { grid-template-columns: 1fr; }
  .menu { width: min(300px, calc(100vw - 32px)); }
}