/* OpenGate: a light "sheet" inside a dark frame lit by a warm gradient glow. */
:root {
  --frame: #121014;
  --sheet: #ffffff;
  --surface: #f7f5f2;
  --surface-2: #efece7;
  --line: #e7e3dd;
  --text: #141216;
  --muted: #6e6a72;
  --ink: #141216;
  --grad: linear-gradient(135deg, #ffb347 0%, #ff5e62 48%, #b44cff 100%);
  --on: #ff7a45;
  --off: #3b3442;
  --ok: #1f9d63;
  --bad: #d64545;
  --radius: 22px;
  --radius-sm: 14px;
  --serif: 'Instrument Serif', 'Times New Roman', serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
  --sans: 'Inter', system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: #0b0a0c;
  color: var(--text);
  font: 15px/1.55 var(--sans);
  min-height: 100vh;
  padding: 18px;
}
a { color: inherit; }
code, pre, .mono { font-family: var(--mono); }
code { background: var(--surface-2); padding: 1px 6px; border-radius: 6px; font-size: .88em; }

/* ---------------------------------------------------------------- frame */
.frame {
  position: relative;
  max-width: 1240px;
  margin: 0 auto;
  border-radius: 32px;
  padding: 0 18px 18px;
  background:
    radial-gradient(60% 50% at 12% 0%, rgba(180, 76, 255, .55), transparent 70%),
    radial-gradient(55% 60% at 95% 8%, rgba(255, 122, 69, .6), transparent 70%),
    radial-gradient(40% 40% at 50% 0%, rgba(255, 94, 98, .35), transparent 70%),
    var(--frame);
  overflow: hidden;
}

.top {
  display: flex; align-items: center; gap: 16px;
  padding: 14px 10px 0;
  position: relative; z-index: 2;
}
.brand { display: flex; align-items: center; gap: 8px; text-decoration: none; color: #fff; }
.logo svg { width: 30px; height: 30px; display: block; }
.name { font: 600 21px/1 var(--serif); letter-spacing: .01em; font-size: 26px; }

/* The notched tab bar: a white tab that grows out of the sheet below it. */
.tabs {
  margin: 0 auto;
  display: flex; gap: 2px;
  background: var(--sheet);
  padding: 10px 14px 12px;
  border-radius: 22px 22px 0 0;
  position: relative; top: 6px;
}
.tabs::before, .tabs::after {
  content: ''; position: absolute; bottom: 6px; width: 22px; height: 22px;
  background: transparent; pointer-events: none;
}
.tabs::before { left: -22px; border-bottom-right-radius: 22px; box-shadow: 8px 8px 0 8px var(--sheet); }
.tabs::after { right: -22px; border-bottom-left-radius: 22px; box-shadow: -8px 8px 0 8px var(--sheet); }
.tabs button {
  background: none; border: 0; color: var(--muted); font: 500 14px var(--sans);
  padding: 8px 14px; border-radius: 999px; cursor: pointer;
}
.tabs button:hover { color: var(--text); }
.tabs button.active { color: var(--text); background: var(--surface-2); font-weight: 600; }
.top-actions { display: flex; gap: 8px; align-items: center; }

.sheet {
  position: relative; z-index: 1;
  background: var(--sheet);
  border-radius: var(--radius) var(--radius) var(--radius) var(--radius);
  padding: 40px 36px 36px;
  min-height: 60vh;
}

/* ---------------------------------------------------------------- buttons */
.btn {
  display: inline-flex; align-items: center; gap: 10px; justify-content: center;
  background: var(--surface); color: var(--text); border: 1px solid var(--line);
  padding: 10px 18px; border-radius: 999px; font: 600 14px var(--sans); cursor: pointer;
  text-decoration: none; transition: transform .12s ease, box-shadow .12s ease, border-color .12s;
}
.btn:hover:not(:disabled) { border-color: #cfc9c1; transform: translateY(-1px); }
.btn.primary, .btn.pill-dark { background: var(--ink); color: #fff; border-color: var(--ink); }
.btn.primary:hover:not(:disabled), .btn.pill-dark:hover { box-shadow: 0 10px 24px rgba(20, 18, 22, .22); }
.btn.ghost { background: transparent; }
.btn:disabled { opacity: .4; cursor: not-allowed; transform: none; }
.btn.pill-light { background: #fff; color: var(--ink); border-color: #fff; padding-right: 10px; }
.btn.pill-light::after, .btn .arrow {
  content: '→'; display: inline-grid; place-items: center;
  width: 26px; height: 26px; border-radius: 50%; background: var(--grad); color: #fff; font-size: 13px;
}
.btn .arrow { content: none; }
.btn.pill-dark { padding: 8px 8px 8px 22px; font-size: 15px; }
.btn.pill-dark .arrow { width: 32px; height: 32px; }
.btn.pill-glass { background: rgba(255, 255, 255, .1); color: #fff; border-color: rgba(255, 255, 255, .18); backdrop-filter: blur(6px); }
.btn.pill-glass:hover { border-color: rgba(255, 255, 255, .4); }
.link { color: var(--text); font-weight: 600; font-size: 14px; text-underline-offset: 4px; }

/* ---------------------------------------------------------------- tabs & hero */
.tab { display: none; }
.tab.active { display: block; animation: rise .35s ease both; }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.hero { margin: 0 auto 28px; max-width: 780px; text-align: center; }
.hero h1 {
  font: 400 clamp(36px, 5vw, 56px)/1.05 var(--serif);
  letter-spacing: -.01em; margin: 0 0 14px;
}
.hero h1 em { font-style: italic; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; padding-right: .06em; }
.hero p { color: var(--muted); margin: 0 auto; max-width: 640px; }
.hero-xl { margin-bottom: 34px; }
.hero-xl h1 { font-size: clamp(46px, 7.4vw, 88px); line-height: .98; }
.eyebrow {
  display: inline-block; margin-bottom: 18px; padding: 6px 14px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--line); font: 500 12px var(--sans); color: var(--muted);
  letter-spacing: .04em;
}
.cta { display: flex; gap: 22px; justify-content: center; align-items: center; margin: 26px 0 30px; flex-wrap: wrap; }
.logos { display: flex; gap: clamp(18px, 4vw, 44px); justify-content: center; flex-wrap: wrap; }
.logos span { font: 600 15px var(--sans); letter-spacing: .18em; color: #bdb7b0; }

.banner {
  border: 1px solid #f0d9a8; background: #fff7e6; color: #7a5410;
  padding: 12px 18px; border-radius: var(--radius-sm); margin: -10px auto 24px; max-width: 900px; text-align: center; font-size: 14px;
}

/* ---------------------------------------------------------------- dark showcase */
.showcase, .dark-card {
  position: relative; overflow: hidden;
  background: #151217; color: #f3eff6; border-radius: var(--radius);
  border: 1px solid #241e28;
}
.showcase { padding: 34px; margin-bottom: 22px; }
.glow { position: absolute; border-radius: 50%; filter: blur(60px); pointer-events: none; opacity: .75; }
.glow.g1 { width: 520px; height: 520px; left: -160px; top: -260px; background: conic-gradient(from 120deg, #b44cff, #ff5e62, #ffb347, #b44cff); }
.glow.g2 { width: 420px; height: 420px; right: -140px; bottom: -260px; background: radial-gradient(circle, #ff5e62, transparent 70%); }
.showcase-inner { position: relative; display: grid; grid-template-columns: 1fr; gap: 22px; }
.showcase-copy { margin: 0 0 0 auto; max-width: 520px; color: #cfc6d6; font-size: 16px; line-height: 1.6; }
.showcase-copy code { background: rgba(255, 255, 255, .1); color: #fff; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(175px, 1fr)); gap: 10px; }
.stat {
  background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .1);
  border-radius: var(--radius-sm); padding: 14px 16px; backdrop-filter: blur(8px);
}
.stat .k { display: block; font-size: 11px; color: #a99fb1; text-transform: uppercase; letter-spacing: .08em; }
.stat .v { display: block; font: 600 17px var(--mono); margin-top: 4px; color: #fff; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------------------------------------------------------------- cards */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); gap: 16px; margin-bottom: 16px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.card h2 { font: 400 24px/1.1 var(--serif); margin: 0 0 14px; color: var(--text); }
.card h3 { font: 600 14px var(--sans); margin: 0 0 8px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 18px 0; }
.muted { color: var(--muted); font-size: 13px; }
.hint { color: var(--muted); font-size: 12px; margin: 10px 0 0; }

.level-row { display: flex; align-items: center; gap: 16px; margin-bottom: 14px; }
.level-big { font: 400 72px/1 var(--serif); background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.level-big small { font-size: 24px; color: var(--muted); -webkit-text-fill-color: var(--muted); }
.mult { font: 600 19px var(--mono); }

.bits { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; margin-bottom: 10px; }
.bit { display: flex; justify-content: space-between; gap: 8px; background: var(--sheet); border: 1px solid var(--line); border-radius: 10px; padding: 7px 11px; font-size: 13px; }
.bit b { font-family: var(--mono); color: var(--muted); }
.bit.on { border-color: #ffc7a8; background: #fff6f0; }
.bit.on b { color: #e0552a; }

.viewing {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  background: #f3efff; border: 1px solid #ddd2ff; color: #4b3a8f;
  border-radius: 12px; padding: 8px 12px; font-size: 13px; margin-bottom: 12px;
}
.viewing code { background: #fff; }
.viewing button { background: none; border: 0; color: inherit; font: 600 13px var(--sans); text-decoration: underline; cursor: pointer; padding: 0; }
.view-form { display: flex; gap: 8px; margin-bottom: 12px; }
.view-form input { font-size: 13px; }

.kv { display: grid; grid-template-columns: auto 1fr; gap: 6px 12px; margin: 0 0 16px; font-size: 14px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; font-family: var(--mono); text-align: right; }
.earned { font: 400 44px/1 var(--serif); margin-bottom: 14px; }
.earned small { font: 500 13px var(--sans); color: var(--muted); }

.field { display: block; margin-bottom: 12px; }
.field span { display: block; font-size: 12px; color: var(--muted); margin-bottom: 5px; font-weight: 500; }
.field.small { max-width: 150px; }
input, textarea, select {
  width: 100%; background: var(--sheet); color: var(--text);
  border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; font: 14px var(--mono);
}
select { font-family: var(--sans); }
input:focus, textarea:focus, select:focus { outline: 2px solid #ff9a6b; outline-offset: -1px; border-color: transparent; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: flex-end; }

.rules table { width: 100%; border-collapse: collapse; font-size: 14px; margin-bottom: 12px; }
.rules th, .rules td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); }
.rules th { color: var(--muted); font-weight: 500; }
.rules code { background: var(--sheet); border: 1px solid var(--line); }

.pending { border-color: #f0d9a8; background: #fffaf0; margin-bottom: 16px; }
.impact { margin: 12px 0; font-size: 14px; }
.impact .up { color: var(--ok); }
.impact .down { color: var(--bad); }
.impact ul { margin: 8px 0 0; padding-left: 18px; font: 12px var(--mono); color: var(--muted); }
.impact li b { color: var(--text); }

/* ---------------------------------------------------------------- circuit */
.card.dark-card { padding: 22px; background: #151217; border-color: #241e28; color: #f3eff6; }
.dark-card > *:not(.glow) { position: relative; }
.toggles { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.toggle {
  display: flex; align-items: center; gap: 8px; background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 999px; padding: 7px 14px; cursor: pointer; font-size: 13px; user-select: none; color: #e9e3ee;
}
.toggle .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--off); }
.toggle.on { border-color: var(--on); }
.toggle.on .dot { background: var(--on); box-shadow: 0 0 10px var(--on); }
.c-result { display: flex; gap: 18px; align-items: center; flex-wrap: wrap; margin-bottom: 14px; font-size: 14px; color: #cfc6d6; }
.c-result b { font: 400 30px/1 var(--serif); background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; vertical-align: -4px; }
.dark-card .btn { background: rgba(255, 255, 255, .08); color: #fff; border-color: rgba(255, 255, 255, .16); }
.dark-card .btn:hover { border-color: rgba(255, 255, 255, .4); }
.svg-wrap { overflow-x: auto; border: 1px solid rgba(255, 255, 255, .1); border-radius: var(--radius-sm); background: rgba(8, 6, 10, .55); }
#c-svg { display: block; min-width: 1100px; width: 100%; height: auto; }
#c-svg .wire { fill: none; stroke: var(--off); stroke-width: 1.2; }
#c-svg .wire.on { stroke: var(--on); stroke-width: 1.8; }
#c-svg .gate rect { fill: #221c27; stroke: #3b3442; }
#c-svg .gate.on rect { stroke: var(--on); }
#c-svg .gate text, #c-svg .pin text { fill: #a99fb1; font: 9px var(--mono); }
#c-svg .pin circle { fill: var(--off); }
#c-svg .pin.on circle { fill: var(--on); }
#c-svg .pin text.label { fill: #f3eff6; font-size: 11px; }

/* ---------------------------------------------------------------- design */
.design-grid { grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); }
.grow { flex: 1; min-width: 200px; }
.check { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); margin-bottom: 12px; }
.check input { width: auto; }
.help { margin: 0 0 14px; font-size: 13px; color: var(--muted); }
.help summary { cursor: pointer; font-weight: 500; }
.badge { display: inline-block; padding: 4px 12px; border-radius: 999px; font: 600 12px var(--mono); }
.badge.ok { background: #e6f6ee; color: var(--ok); }
.badge.bad { background: #fdecec; color: var(--bad); }
.d-facts { display: grid; grid-template-columns: auto 1fr; gap: 5px 14px; font-size: 14px; margin: 14px 0; }
.d-facts dt { color: var(--muted); }
.d-facts dd { margin: 0; font-family: var(--mono); }
.tt-wrap { max-height: 300px; overflow: auto; border: 1px solid var(--line); border-radius: 12px; margin-bottom: 12px; background: var(--sheet); }
.tt { border-collapse: collapse; width: 100%; font: 12px var(--mono); }
.tt th, .tt td { padding: 4px 9px; text-align: right; border-bottom: 1px solid var(--line); }
.tt th { position: sticky; top: 0; background: var(--surface-2); color: var(--muted); font-weight: 500; }
.tt td.sep { color: #c0b9b1; }
.error { color: var(--bad); font-family: var(--mono); font-size: 13px; white-space: pre-wrap; }

/* ---------------------------------------------------------------- setup */
.steps { list-style: none; padding: 0; margin: 0 0 16px; display: grid; gap: 12px; }
.out { font: 12px var(--mono); color: var(--muted); margin-top: 10px; word-break: break-all; }
.out .ok { color: var(--ok); }
pre { background: var(--sheet); border: 1px solid var(--line); border-radius: 12px; padding: 14px; overflow-x: auto; font-size: 12px; }

/* ---------------------------------------------------------------- toast & footer */
.toast {
  position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%);
  max-width: min(560px, calc(100vw - 32px));
  background: var(--ink); color: #fff; border-radius: 999px;
  padding: 12px 20px; font-size: 14px; box-shadow: 0 14px 34px rgba(0, 0, 0, .35); z-index: 10;
}
.toast.error { background: #3a1416; }
.toast a { margin-left: 8px; color: #ffb38c; }

footer {
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding: 18px 10px 2px; color: #a99fb1; font-size: 12px;
}
footer a { color: #fff; }

/* ---------------------------------------------------------------- small screens */
@media (max-width: 860px) {
  body { padding: 8px; }
  .frame { border-radius: 24px; padding: 0 8px 8px; }
  .top { flex-wrap: wrap; padding: 12px 6px 0; }
  .top-actions { margin-left: auto; }
  .top-actions .pill-glass { display: none; }
  .tabs { order: 3; width: 100%; overflow-x: auto; border-radius: 18px 18px 0 0; padding: 8px; top: 0; margin-top: 10px; }
  .tabs::before, .tabs::after { display: none; }
  .sheet { padding: 28px 16px 20px; border-radius: 0 0 18px 18px; }
  .showcase { padding: 20px; }
  .showcase-copy { margin: 0; }
  .card { padding: 18px; }
}