/* agent-memory-bench — site styles
   One aesthetic: ink on paper. Serif prose (Newsreader), mono data (Spline Sans Mono).
   No color. Information is the decoration. */

:root {
  --paper: #fbfbf9;
  --ink: #131311;
  --ink-soft: #4a4a46;
  --ink-faint: #8b8b85;
  --rule: #dcdcd6;
  --rule-dark: #131311;
  --code-bg: #f0f0ec;
  --serif: "Newsreader", "Georgia", serif;
  --mono: "Spline Sans Mono", "Courier New", monospace;
  --max: 1120px;
  --pad: clamp(20px, 4vw, 48px);
  color-scheme: light;
}

/* Dark mode: the same page, inverted. Paper becomes ink, ink becomes paper,
   and the blocks that were already inverted (pre, footer, dark callouts)
   invert back to light, keeping the two-tone language intact. */
:root[data-theme="dark"] {
  --paper: #131311;
  --ink: #f4f4f0;
  --ink-soft: #b3b3ab;
  --ink-faint: #7a7a72;
  --rule: #32322e;
  --rule-dark: #f4f4f0;
  --code-bg: #232320;
  color-scheme: dark;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  transition: background 200ms ease, color 200ms ease;
  font-family: var(--serif);
  font-optical-sizing: auto;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--ink); color: var(--paper); }

a { color: inherit; }

/* ---------- masthead ---------- */

.masthead {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--paper);
  border-bottom: 1px solid var(--rule-dark);
}

.masthead-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad);
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 16px;
  height: 56px;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.wordmark .tick {
  display: inline-block;
  width: 9px;
  height: 9px;
  background: var(--ink);
}

.wordmark strong { font-weight: 600; }
.wordmark .short { display: none; }

.masthead nav {
  display: flex;
  align-items: stretch;
}

.masthead nav a {
  display: flex;
  align-items: center;
  padding: 0 clamp(8px, 1.6vw, 18px);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-soft);
  border-left: 1px solid var(--rule);
  transition: background 120ms ease, color 120ms ease;
}

.masthead nav a:last-child { border-right: 1px solid var(--rule); }

.masthead nav a:hover { background: var(--ink); color: var(--paper); }

.masthead nav a[aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
  box-shadow: inset 0 -3px 0 var(--ink);
}

.theme-toggle {
  display: flex;
  align-items: center;
  padding: 0 clamp(10px, 1.6vw, 18px);
  background: none;
  border: 0;
  border-left: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
  cursor: pointer;
  color: var(--ink-soft);
  transition: background 120ms ease, color 120ms ease;
}

.theme-toggle:hover { background: var(--ink); color: var(--paper); }

.theme-toggle .sw {
  display: block;
  width: 10px;
  height: 10px;
  border: 1px solid currentColor;
  background: currentColor;
  transition: background 120ms ease;
}

:root[data-theme="dark"] .theme-toggle .sw { background: transparent; }

/* ---------- shared layout ---------- */

.sheet {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.rule { border: 0; border-top: 1px solid var(--rule); }
.rule-dark { border: 0; border-top: 1px solid var(--rule-dark); }

.kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 14px 0 12px;
  border-top: 1px solid var(--rule-dark);
}

.section-head .no {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
}

.section-head h2 {
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 500;
  letter-spacing: -0.01em;
}

.section-head .aside {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  text-align: right;
}

/* ---------- hero ---------- */

.hero { padding: clamp(48px, 8vh, 104px) 0 clamp(36px, 6vh, 72px); }

.hero .kicker { display: block; margin-bottom: 22px; }

.hero h1 {
  font-size: clamp(42px, 7.2vw, 96px);
  line-height: 1.02;
  font-weight: 400;
  letter-spacing: -0.022em;
  max-width: 15ch;
}

.hero h1 em {
  font-style: italic;
  font-weight: 400;
}

.hero .dek {
  margin-top: 28px;
  max-width: 62ch;
  font-size: clamp(17px, 1.6vw, 20px);
  color: var(--ink-soft);
}

.hero .dek strong { color: var(--ink); font-weight: 600; }

.hero-cta {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 11px 20px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid var(--ink);
  transition: background 120ms ease, color 120ms ease;
}

.btn-solid { background: var(--ink); color: var(--paper); }
.btn-solid:hover { background: var(--paper); color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); }

/* ---------- stat band ---------- */

.stat-band {
  border-top: 1px solid var(--rule-dark);
  border-bottom: 1px solid var(--rule-dark);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.stat-grid > div {
  padding: 18px 20px 20px;
  border-left: 1px solid var(--rule);
}

.stat-grid > div:first-child { border-left: 0; padding-left: 0; }

.stat-grid .n {
  font-family: var(--mono);
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 500;
  line-height: 1.1;
}

.stat-grid .l {
  margin-top: 6px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* ---------- prose ---------- */

.prose { max-width: 68ch; }
.prose p { margin: 0 0 1.1em; }
.prose p:last-child { margin-bottom: 0; }
.prose strong { font-weight: 600; }
.prose em { font-style: italic; }

.prose a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: var(--ink-faint);
  transition: text-decoration-color 120ms ease;
}
.prose a:hover { text-decoration-color: var(--ink); }

code, .m {
  font-family: var(--mono);
  font-size: 0.86em;
}

.prose code {
  background: var(--code-bg);
  padding: 1px 5px;
  border: 1px solid var(--rule);
}

pre {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  background: var(--ink);
  color: var(--paper);
  padding: 18px 22px;
  overflow-x: auto;
  margin: 18px 0;
}

pre .c { color: #9a9a92; }

/* ---------- decision list (index) ---------- */

.decisions { counter-reset: dec; }

.decision {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 20px;
  padding: 26px 0;
  border-top: 1px solid var(--rule);
}

.decision:first-of-type { border-top: 0; }

.decision .idx {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-faint);
  padding-top: 5px;
}

.decision h3 {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}

.decision p {
  color: var(--ink-soft);
  max-width: 66ch;
}

/* ---------- arms strip ---------- */

.arm-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-left: 1px solid var(--rule);
  border-top: 1px solid var(--rule);
}

.arm-cell {
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 16px 18px 18px;
  transition: background 120ms ease, color 120ms ease;
}

.arm-cell:hover { background: var(--ink); color: var(--paper); }
.arm-cell:hover .arm-type { color: var(--paper); opacity: 0.7; }

.arm-cell .arm-name {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
}

.arm-cell .arm-type {
  margin-top: 6px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
}

.arm-cell .badge {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid currentColor;
  padding: 2px 7px;
}

/* ---------- pipeline diagram ---------- */

.pipeline { padding: 8px 0 4px; }
.pipeline svg { width: 100%; height: auto; display: block; }

/* ---------- tables ---------- */

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

thead th {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--ink-soft);
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--rule-dark);
  white-space: nowrap;
}

tbody td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

tbody tr { transition: background 100ms ease, color 100ms ease; }
tbody tr:hover { background: var(--ink); color: var(--paper); }
tbody tr:hover .dim, tbody tr:hover .m-dim { color: var(--paper); opacity: 0.65; }

td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
td .m, th .m { font-size: 13px; }

.dim { color: var(--ink-soft); }
.m-dim { font-family: var(--mono); font-size: 12.5px; color: var(--ink-faint); }

.table-scroll { overflow-x: auto; }

/* ---------- callout ---------- */

.callout {
  border: 1px solid var(--ink);
  padding: 20px 24px;
  max-width: 74ch;
}

.callout .kicker { display: block; margin-bottom: 10px; }

.callout-invert {
  background: var(--ink);
  color: var(--paper);
}

.callout-invert .kicker { color: var(--paper); opacity: 0.7; }
.callout-invert code { background: transparent; border-color: #4a4a46; color: var(--paper); }

/* ---------- contrast ledger (method) ---------- */

.contrast {
  display: grid;
  grid-template-columns: minmax(180px, 260px) 1fr;
  gap: 18px;
  padding: 14px 0;
  border-top: 1px solid var(--rule);
  align-items: baseline;
}

.contrast:first-of-type { border-top: 0; }

.contrast .expr {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
}

.contrast p { color: var(--ink-soft); font-size: 15.5px; }

/* ---------- rule list (submit) ---------- */

.rulebook { counter-reset: rulen; list-style: none; }

.rulebook > li {
  counter-increment: rulen;
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 18px;
  padding: 20px 0;
  border-top: 1px solid var(--rule);
}

.rulebook > li:first-child { border-top: 0; }

.rulebook > li::before {
  content: "R" counter(rulen, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-faint);
  padding-top: 3px;
}

.rulebook h3 { font-size: 18px; font-weight: 600; margin-bottom: 6px; }
.rulebook p { color: var(--ink-soft); max-width: 68ch; }
.rulebook p + p { margin-top: 8px; }

/* ---------- spacing helpers ---------- */

.pad-y { padding: clamp(36px, 6vh, 72px) 0; }
.pad-y-s { padding: clamp(22px, 4vh, 40px) 0; }
.mt-s { margin-top: 16px; }
.mt-m { margin-top: 28px; }
.mt-l { margin-top: 44px; }

/* ---------- page head (inner pages) ---------- */

.page-head { padding: clamp(40px, 7vh, 80px) 0 clamp(26px, 4vh, 44px); }

.page-head h1 {
  font-size: clamp(36px, 5.4vw, 64px);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.page-head h1 em { font-style: italic; }

.page-head .dek {
  margin-top: 18px;
  max-width: 64ch;
  font-size: 18px;
  color: var(--ink-soft);
}

/* ---------- status line ---------- */

.status-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-soft);
  padding: 10px 0;
  border-top: 1px solid var(--rule-dark);
  border-bottom: 1px solid var(--rule);
}

.status-line .live::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--ink);
  margin-right: 8px;
  animation: blink 2.4s step-end infinite;
}

@keyframes blink { 50% { opacity: 0.15; } }

/* What the ranking is a ranking OF. Filled by site.js from the generated data; it sits above
   the table on purpose, because a qualification a reader has to scroll for is a footnote. */
.scope-note:empty { display: none; }

.scope-note {
  display: block;
  margin-top: 18px;
  padding: 14px 16px;
  border-left: 3px solid var(--ink);
  background: var(--paper-soft, transparent);
  font-size: 14px;
}

.scope-note strong {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.scope-note p {
  margin: 6px 0 0;
  color: var(--ink-soft);
}

/* ---------- footer ---------- */

footer {
  margin-top: clamp(48px, 9vh, 110px);
  border-top: 1px solid var(--rule-dark);
  background: var(--ink);
  color: var(--paper);
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 34px var(--pad) 40px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.9;
}

footer a { color: var(--paper); text-decoration: none; border-bottom: 1px solid #4a4a46; }
footer a:hover { border-bottom-color: var(--paper); }

footer .foot-title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

footer .dim { color: #9a9a92; }

/* ---------- reveal on load ---------- */

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(10px);
    animation: reveal 640ms cubic-bezier(0.2, 0.6, 0.2, 1) forwards;
  }
  .reveal:nth-child(2), .r2 { animation-delay: 90ms; }
  .r3 { animation-delay: 180ms; }
  .r4 { animation-delay: 270ms; }
  @keyframes reveal { to { opacity: 1; transform: none; } }
}

/* ---------- responsive ---------- */

@media (max-width: 860px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-grid > div { border-left: 0; padding-left: 0; }
  .stat-grid > div:nth-child(even) { border-left: 1px solid var(--rule); padding-left: 20px; }
  .stat-grid > div:nth-child(n+3) { border-top: 1px solid var(--rule); }
  .arm-strip { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr; gap: 22px; }
  .masthead nav a { padding: 0 10px; }
}

@media (max-width: 700px) {
  .wordmark .long, .wordmark .full { display: none; }
  .wordmark .short { display: inline; }
  .masthead-inner { gap: 8px; height: 48px; }
  .masthead nav { overflow-x: auto; }
}

@media (max-width: 560px) {
  .decision, .rulebook > li { grid-template-columns: 1fr; gap: 6px; }
  .contrast { grid-template-columns: 1fr; gap: 6px; }
}