/* Nullar Protocol — design system. Monochrome. The absurdity is in the content. */

:root {
  --bg: #fafaf8;
  --surface: #ffffff;
  --ink: #111111;
  --ink-2: #555555;
  --ink-3: #8a8a8a;
  --line: #e4e4e0;
  --line-2: #cfcfca;
  --ok: #111111;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --max: 1080px;
  --r: 2px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0b0b;
    --surface: #111111;
    --ink: #f2f2f0;
    --ink-2: #a6a6a2;
    --ink-3: #6e6e6a;
    --line: #222220;
    --line-2: #34342f;
    --ok: #f2f2f0;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0b0b0b; --surface: #111111; --ink: #f2f2f0; --ink-2: #a6a6a2; --ink-3: #6e6e6a;
  --line: #222220; --line-2: #34342f; --ok: #f2f2f0; color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
::selection { background: var(--ink); color: var(--bg); }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
@media (max-width: 600px) { .wrap { padding: 0 16px; } }

/* Header */
.hdr { border-bottom: 1px solid var(--line); }
.hdr .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 600; letter-spacing: -0.01em; white-space: nowrap; }
.brand .sym { font-size: 26px; line-height: 1; font-weight: 400; }
.nav { display: flex; gap: 22px; font-size: 14px; overflow-x: auto; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav a { text-decoration: none; color: var(--ink-2); white-space: nowrap; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
@media (max-width: 760px) {
  .hdr .wrap { height: auto; flex-direction: column; align-items: flex-start; padding-top: 14px; padding-bottom: 10px; gap: 10px; }
  .nav { width: 100%; gap: 18px; }
}

/* Typography */
h1, h2, h3 { font-weight: 600; letter-spacing: -0.02em; line-height: 1.15; margin: 0; }
h1 { font-size: clamp(34px, 6vw, 56px); }
h2 { font-size: clamp(24px, 3.2vw, 32px); }
h3 { font-size: 18px; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }
.lead { font-size: clamp(18px, 2.2vw, 21px); color: var(--ink-2); max-width: 640px; }
.muted { color: var(--ink-2); }
.faint { color: var(--ink-3); }
.mono { font-family: var(--mono); font-size: 0.92em; }
.eyebrow { font: 500 12px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-3); margin-bottom: 18px; }
.quote { font-family: var(--serif); font-size: clamp(22px, 3vw, 30px); line-height: 1.35; font-style: italic; letter-spacing: -0.01em; }

/* Sections */
.page { padding: 72px 0 96px; }
.page > .wrap > header { margin-bottom: 48px; }
.page > .wrap > header .lead { margin-top: 14px; }
section + section { margin-top: 72px; }
@media (max-width: 600px) { .page { padding: 44px 0 72px; } section + section { margin-top: 56px; } }

/* Hero */
.hero { padding: 88px 0 64px; text-align: center; }
.hero .mark { font-size: clamp(120px, 22vw, 220px); line-height: 0.9; font-weight: 300; margin-bottom: 28px; }
.hero h1 { font-size: clamp(40px, 7vw, 68px); }
.hero .sub { font: 500 13px/1 var(--mono); letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-2); margin-top: 16px; }
.hero .lead { margin: 30px auto 0; }
.hook { display: inline-grid; grid-template-columns: auto auto; gap: 6px 36px; margin: 44px auto 0; font-family: var(--mono); font-size: clamp(16px, 2.4vw, 20px); text-align: left; }
.hook dt { color: var(--ink-2); }
.hook dd { margin: 0; text-align: right; font-weight: 600; }
.hook-line { margin-top: 26px; font-size: 18px; }

/* Buttons */
.actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 40px; }
.actions.left { justify-content: flex-start; }
.btn {
  appearance: none; display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 46px; padding: 0 22px; border: 1px solid var(--ink); border-radius: var(--r);
  background: transparent; color: var(--ink); font: 500 15px/1 var(--sans); text-decoration: none; cursor: pointer;
  transition: background .15s, color .15s;
}
.btn:hover { background: var(--ink); color: var(--bg); text-decoration: none; }
.btn.primary { background: var(--ink); color: var(--bg); }
.btn.primary:hover { background: transparent; color: var(--ink); }
.btn.small { min-height: 36px; padding: 0 14px; font-size: 13px; }
@media (max-width: 600px) { .actions .btn { flex: 1 1 calc(50% - 6px); } }

/* Data */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.stat { padding: 20px 20px 22px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--surface); }
.stat .k { font: 500 11px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-3); }
.stat .v { margin-top: 12px; font: 600 26px/1.1 var(--mono); letter-spacing: -0.02em; word-break: break-all; }

.kv { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 14px; }
.kv th, .kv td { text-align: left; padding: 12px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.kv th { color: var(--ink-2); font-weight: 400; width: 42%; padding-right: 16px; }
.kv td { font-weight: 600; word-break: break-all; }

.panel { border: 1px solid var(--line); background: var(--surface); padding: 28px; border-radius: var(--r); }
@media (max-width: 600px) { .panel { padding: 20px; } }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 860px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

pre, .code {
  font-family: var(--mono); font-size: 14px; line-height: 1.6;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r);
  padding: 18px 20px; overflow-x: auto; margin: 0;
}

/* Terminal-like result */
.result { font-family: var(--mono); font-size: 15px; line-height: 1.7; white-space: pre-wrap; min-height: 1.7em; }
.result:empty::before { content: "—"; color: var(--ink-3); }
.result strong { font-weight: 700; }
.flash { animation: flash .5s ease-out; }
@keyframes flash { from { opacity: .2; } to { opacity: 1; } }
@media (prefers-reduced-motion: reduce) { .flash { animation: none; } }

/* Forms */
label { display: block; font: 500 12px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-3); margin: 0 0 8px; }
input[type=text], textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--line-2); border-radius: var(--r);
  background: var(--bg); color: var(--ink); font: 15px/1.4 var(--mono);
}
input[readonly] { color: var(--ink-2); }
textarea { min-height: 88px; resize: vertical; }
.field + .field { margin-top: 18px; }
.row { display: flex; gap: 12px; }
.row > * { flex: 1; }
@media (max-width: 600px) { .row { flex-direction: column; } }

/* Chart */
.chart { border: 1px solid var(--line); background: var(--surface); padding: 20px 20px 14px; border-radius: var(--r); }
.chart-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.chart-head .price { font: 600 32px/1 var(--mono); }
.chart-head .chg { font: 500 13px/1 var(--mono); color: var(--ink-2); }
.live { display: inline-flex; align-items: center; gap: 7px; font: 500 11px/1 var(--mono); letter-spacing: .12em; color: var(--ink-2); }
.live::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--ink); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .25; } }
.chart svg { display: block; width: 100%; height: 170px; overflow: visible; }
.chart .axis { font: 11px var(--mono); fill: var(--ink-3); }
.chart-foot { display: flex; gap: 22px; flex-wrap: wrap; margin-top: 10px; font: 12px var(--mono); color: var(--ink-2); }

/* Lists */
.checks { list-style: none; padding: 0; margin: 0; }
.checks li { padding: 14px 0; border-bottom: 1px solid var(--line); display: flex; gap: 14px; }
.checks li::before { content: "✓"; font-family: var(--mono); }
.faq details { border-bottom: 1px solid var(--line); padding: 18px 0; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 17px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::after { content: "+"; font-family: var(--mono); color: var(--ink-3); }
.faq details[open] summary::after { content: "−"; }
.faq summary::-webkit-details-marker { display: none; }
.faq .a { margin-top: 12px; font-family: var(--mono); font-size: 14px; white-space: pre-wrap; color: var(--ink-2); }

/* Prose (whitepaper, legal) */
.prose { max-width: 720px; }
.prose h2 { margin: 56px 0 16px; font-size: 24px; }
.prose h2 .n { font-family: var(--mono); font-weight: 400; color: var(--ink-3); margin-right: 10px; }
.prose ul { padding-left: 20px; }
.prose li { margin: 4px 0; }
.prose pre { margin: 18px 0; }

/* Footer */
.ftr { border-top: 1px solid var(--line); padding: 40px 0 56px; font-size: 13px; color: var(--ink-2); }
.ftr .cols { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.ftr nav { display: flex; gap: 18px; flex-wrap: wrap; }
.ftr a { text-decoration: none; }
.ftr a:hover { color: var(--ink); text-decoration: underline; }
.ftr .disc { margin-top: 24px; max-width: 640px; color: var(--ink-3); font-size: 12px; }

.center { text-align: center; }
.mt-0 { margin-top: 0; } .mt-1 { margin-top: 12px; } .mt-2 { margin-top: 24px; } .mt-3 { margin-top: 40px; }
.hidden { display: none !important; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Overflow guards */
.grid-2 > *, .grid-3 > *, .row > * { min-width: 0; }
p .mono, td.mono { word-break: break-all; }