/* hypgraph.com — one stylesheet. Dark by default, light via prefers-color-scheme or the toggle (html[data-theme]). */

:root {
  --bg: #06080d; --bg2: #0b0f17; --panel: #0f1520; --panel2: #131b29;
  --ink: #e8eef7; --ink2: #a3b0c2; --ink3: #64748b; --line: #1c2533; --line2: #2a3648;
  --accent: #7cf3ff; --violet: #b18cff; --green: #4ee08a; --red: #ff4d5e; --amber: #ffb547;
  --glow: 0 0 0 1px rgba(124, 243, 255, .18), 0 10px 40px rgba(124, 243, 255, .08);
  --mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --r: 14px; --max: 1160px;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f7f8fb; --bg2: #eef1f6; --panel: #ffffff; --panel2: #f3f5f9;
    --ink: #0d1321; --ink2: #475569; --ink3: #8a96a8; --line: #dbe1ea; --line2: #c7d0dd;
    --accent: #0b6bcb; --violet: #6d4bd8; --green: #0a7a3c; --red: #c4182a; --amber: #a35f00;
    --glow: 0 0 0 1px rgba(11, 107, 203, .12), 0 10px 30px rgba(13, 19, 33, .06);
    color-scheme: light;
  }
}
:root[data-theme="light"] {
  --bg: #f7f8fb; --bg2: #eef1f6; --panel: #ffffff; --panel2: #f3f5f9;
  --ink: #0d1321; --ink2: #475569; --ink3: #8a96a8; --line: #dbe1ea; --line2: #c7d0dd;
  --accent: #0b6bcb; --violet: #6d4bd8; --green: #0a7a3c; --red: #c4182a; --amber: #a35f00;
  --glow: 0 0 0 1px rgba(11, 107, 203, .12), 0 10px 30px rgba(13, 19, 33, .06);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--sans); }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
code, pre, kbd { font-family: var(--mono); }
code { font-size: .9em; background: var(--panel2); border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; }
pre { margin: 0; }
img, svg { max-width: 100%; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.skip { position: absolute; left: -9999px; } .skip:focus { left: 16px; top: 16px; z-index: 99; background: var(--panel); padding: 8px 12px; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 28px; } }

/* ── nav ── */
.nav { position: sticky; top: 0; z-index: 50; backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 78%, transparent); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; gap: 18px; height: 58px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700;
  letter-spacing: -.01em; font-size: 17px; }
.brand img { width: 28px; height: 28px; }
.brand b { font-family: var(--mono); font-weight: 600; color: var(--accent); }
.nav nav { display: flex; gap: 4px; margin-left: auto; align-items: center; }
.nav nav a { color: var(--ink2); text-decoration: none; padding: 6px 10px; border-radius: 8px; font-size: 14px; }
.nav nav a:hover, .nav nav a[aria-current="page"] { color: var(--ink); background: var(--panel2); }
.iconbtn { background: none; border: 1px solid var(--line2); color: var(--ink2); width: 34px; height: 34px;
  border-radius: 9px; cursor: pointer; display: inline-grid; place-items: center; font-size: 15px; }
.iconbtn:hover { color: var(--ink); border-color: var(--accent); }
@media (max-width: 760px) { .nav nav a.hide-sm { display: none; } }
@media (max-width: 420px) { .nav nav a { padding: 6px 6px; font-size: 13px; } .brand span { display: none; } }

/* ── hero ── */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); }
.hero canvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: .9; }
.hero::after { content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse 70% 60% at 50% 40%, transparent 0%, var(--bg) 85%); }
.hero .wrap { position: relative; z-index: 2; padding-top: 88px; padding-bottom: 72px; text-align: center; }
.eyebrow { display: inline-flex; gap: 8px; align-items: center; font-family: var(--mono); font-size: 12px;
  letter-spacing: .14em; text-transform: uppercase; color: var(--ink2); border: 1px solid var(--line2);
  background: color-mix(in srgb, var(--panel) 70%, transparent); padding: 5px 12px; border-radius: 999px; }
.eyebrow i { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px var(--green); }
h1.title { font-size: clamp(38px, 7.4vw, 86px); line-height: 1.02; letter-spacing: -.035em; margin: 22px 0 18px;
  font-weight: 800; }
h1.title .l2 { display: block; background: linear-gradient(92deg, var(--accent), var(--violet) 55%, var(--green));
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.lede { font-size: clamp(17px, 2.1vw, 21px); color: var(--ink2); max-width: 760px; margin: 0 auto; }

/* ── the door ── */
.door { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 920px; margin: 40px auto 0; text-align: left; }
@media (max-width: 720px) { .door { grid-template-columns: 1fr; } }
.portal { position: relative; display: block; text-decoration: none; color: var(--ink); background: var(--panel);
  border: 1px solid var(--line2); border-radius: var(--r); padding: 22px 22px 20px; box-shadow: var(--glow);
  transition: transform .18s ease, border-color .18s ease; overflow: hidden; }
.portal:hover { transform: translateY(-2px); border-color: var(--accent); }
@media (prefers-reduced-motion: reduce) { .portal { transition: none; } .portal:hover { transform: none; } }
.portal .who { font-family: var(--mono); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.portal.agent .who { color: var(--violet); }
.portal h2 { margin: 6px 0 6px; font-size: 26px; letter-spacing: -.02em; }
.portal p { margin: 0 0 14px; color: var(--ink2); font-size: 15px; }
.portal .go { font-family: var(--mono); font-size: 14px; color: var(--ink); }
.portal .go::after { content: " →"; color: var(--accent); }
.portal pre { font-size: 12.5px; background: var(--bg2); border: 1px solid var(--line); border-radius: 9px; padding: 9px 11px;
  overflow-x: auto; color: var(--ink2); margin-bottom: 12px; }

/* ── sections ── */
section.block { padding: 72px 0; border-bottom: 1px solid var(--line); }
.kicker { font-family: var(--mono); font-size: 12px; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); }
h2.h { font-size: clamp(28px, 4vw, 42px); letter-spacing: -.025em; line-height: 1.12; margin: 8px 0 12px; }
.sub { color: var(--ink2); max-width: 760px; font-size: 17px; margin: 0 0 28px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.grid2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.grid2 > *, .grid3 > *, .grid4 > *, .door > *, .play > *, .doc > * { min-width: 0; }
@media (max-width: 960px) { .grid3, .grid4 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 620px) { .grid3, .grid2, .grid4 { grid-template-columns: 1fr; } }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); padding: 18px 18px 16px; }
.card h3 { margin: 4px 0 6px; font-size: 17px; letter-spacing: -.01em; }
.card p { margin: 0; color: var(--ink2); font-size: 15px; }
.card .n { font-family: var(--mono); font-size: 12px; color: var(--ink3); }
.card.rule h3::before { content: "◆ "; color: var(--accent); font-size: 12px; vertical-align: 2px; }

/* terminal */
.term { background: #05070b; color: #d7e2f0; border: 1px solid var(--line2); border-radius: var(--r); overflow: hidden;
  box-shadow: var(--glow); }
:root[data-theme="light"] .term { background: #0d1321; }
.term .bar { display: flex; gap: 6px; align-items: center; padding: 10px 12px; border-bottom: 1px solid #1c2533; }
.term .bar i { width: 10px; height: 10px; border-radius: 50%; background: #2a3648; }
.term .bar span { margin-left: 8px; font: 12px var(--mono); color: #64748b; }
.term pre { padding: 16px 18px; font-size: 13.5px; line-height: 1.6; white-space: pre-wrap; word-break: break-word; min-height: 320px; }
.term .p { color: #7cf3ff; } .term .x { color: #ff6b7a; } .term .ok { color: #4ee08a; } .term .dim { color: #64748b; }
.term .caret { display: inline-block; width: 8px; height: 1.1em; background: #7cf3ff; vertical-align: -2px; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .term .caret { animation: none; } }

/* code blocks with copy */
.code { position: relative; background: var(--bg2); border: 1px solid var(--line); border-radius: 11px; }
.code pre { padding: 13px 15px; overflow-x: auto; font-size: 13.5px; line-height: 1.55; color: var(--ink); }
.code .copy { position: absolute; top: 7px; right: 7px; font: 12px var(--mono); background: var(--panel); color: var(--ink2);
  border: 1px solid var(--line2); border-radius: 7px; padding: 3px 8px; cursor: pointer; }
.code .copy:hover { color: var(--ink); border-color: var(--accent); }
.code .lbl { position: absolute; top: -9px; left: 12px; font: 11px var(--mono); background: var(--bg); color: var(--ink3);
  padding: 0 6px; letter-spacing: .08em; text-transform: uppercase; }
.stack > * + * { margin-top: 14px; }

/* atlas frame */
.atlas-frame { height: 640px; border: 1px solid var(--line2); border-radius: var(--r); overflow: hidden; box-shadow: var(--glow); }
@media (max-width: 900px) { .atlas-frame { height: 82vh; } }
.atlas-frame .atlas { --hg-bg: var(--bg2); --hg-bg1: var(--panel); --hg-bg2: var(--panel2); --hg-panel: var(--panel);
  --hg-ink: var(--ink); --hg-ink2: var(--ink2); --hg-ink3: var(--ink3); --hg-line: var(--line); --hg-line2: var(--line2);
  --hg-accent: var(--accent); --hg-light-bg: var(--bg2); --hg-light-bg1: var(--panel); --hg-light-bg2: var(--panel2);
  --hg-light-panel: var(--panel); --hg-light-ink: var(--ink); --hg-light-ink2: var(--ink2); --hg-light-ink3: var(--ink3);
  --hg-light-line: var(--line); --hg-light-line2: var(--line2); --hg-light-accent: var(--accent); }
.note { font-size: 14px; color: var(--ink3); margin-top: 10px; }

/* buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; font: 600 15px var(--sans); text-decoration: none; cursor: pointer;
  padding: 10px 16px; border-radius: 10px; border: 1px solid var(--line2); color: var(--ink); background: var(--panel); }
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: #031016; border-color: transparent; }
:root[data-theme="light"] .btn.primary { color: #fff; }
@media (prefers-color-scheme: light) { :root:not([data-theme="dark"]) .btn.primary { color: #fff; } }
.btn:disabled { opacity: .5; cursor: default; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* page header for inner pages */
.phead { padding: 56px 0 28px; border-bottom: 1px solid var(--line); }
.phead h1 { font-size: clamp(32px, 5vw, 52px); letter-spacing: -.03em; line-height: 1.06; margin: 10px 0 10px; }
.phead p { color: var(--ink2); font-size: 18px; max-width: 780px; margin: 0; }
.doc { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 40px; padding: 36px 0 80px; }
@media (max-width: 900px) { .doc { grid-template-columns: 1fr; gap: 0; } .toc { display: none; } }
.toc { position: sticky; top: 76px; align-self: start; font-size: 14px; }
.toc a { display: block; color: var(--ink2); text-decoration: none; padding: 4px 0 4px 10px; border-left: 2px solid var(--line); }
.toc a:hover { color: var(--ink); border-left-color: var(--accent); }
.prose h2 { font-size: 26px; letter-spacing: -.02em; margin: 44px 0 10px; scroll-margin-top: 80px; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 18px; margin: 26px 0 8px; scroll-margin-top: 80px; }
.prose p, .prose li { color: var(--ink); max-width: 76ch; }
.prose ul, .prose ol { padding-left: 22px; }
.prose table { border-collapse: collapse; width: 100%; font-size: 14px; display: block; overflow-x: auto; }
.prose th, .prose td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { font: 12px var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink2); }
.prose blockquote { margin: 14px 0; padding: 10px 14px; border-left: 3px solid var(--accent); background: var(--panel); color: var(--ink2); }
.callout { border: 1px solid var(--line2); border-left: 3px solid var(--violet); background: var(--panel); border-radius: 10px;
  padding: 14px 16px; margin: 18px 0; }
.callout b { color: var(--violet); }

/* verify */
.drop { border: 2px dashed var(--line2); border-radius: var(--r); padding: 40px 20px; text-align: center; background: var(--panel);
  cursor: pointer; transition: border-color .15s; }
.drop.over, .drop:hover { border-color: var(--accent); }
.vres { margin-top: 18px; }
.vres .big { font-size: 22px; font-weight: 700; }
.vres .good { color: var(--green); } .vres .bad { color: var(--red); } .vres .warn { color: var(--amber); }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; font-size: 14px; margin-top: 10px; }
.kv dt { font-family: var(--mono); color: var(--ink3); } .kv dd { margin: 0; font-family: var(--mono); word-break: break-all; }

/* playground */
.play { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 900px) { .play { grid-template-columns: 1fr; } }
.field { display: flex; flex-direction: column; gap: 5px; margin-bottom: 12px; }
.field label { font: 12px var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink2); }
.field textarea, .field input, .field select { font: 14px var(--sans); color: var(--ink); background: var(--bg2);
  border: 1px solid var(--line2); border-radius: 9px; padding: 9px 11px; width: 100%; }
.field textarea.mono { font-family: var(--mono); font-size: 13px; }
.out { background: var(--bg2); border: 1px solid var(--line); border-radius: 11px; padding: 14px 16px; min-height: 120px;
  font: 13.5px/1.55 var(--mono); white-space: pre-wrap; word-break: break-word; }
.out .x { color: var(--red); } .out .ok { color: var(--green); } .out .dim { color: var(--ink3); }
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.chip { font: 13px var(--sans); background: var(--panel2); border: 1px solid var(--line2); color: var(--ink2); border-radius: 999px;
  padding: 5px 11px; cursor: pointer; }
.chip:hover { color: var(--ink); border-color: var(--accent); }

/* footer */
footer { padding: 40px 0 56px; color: var(--ink3); font-size: 14px; }
footer .wrap { display: flex; gap: 24px; flex-wrap: wrap; justify-content: space-between; }
footer a { color: var(--ink2); }
footer .slogan { font-family: var(--mono); color: var(--ink2); }