/* rememori.dev — dark technical, violet 280 anchor, Committed strategy */

:root {
  /* color */
  --bg: oklch(0.13 0.015 280);
  --surface: oklch(0.17 0.018 280);
  --surface-2: oklch(0.21 0.02 280);
  --line: oklch(0.30 0.02 280);
  --ink: oklch(0.93 0.008 280);
  --muted: oklch(0.74 0.02 280);
  --brand: oklch(0.74 0.17 285);
  --brand-strong: oklch(0.66 0.21 285);
  --brand-dim: oklch(0.45 0.12 285);
  --ok: oklch(0.80 0.14 155);

  /* type */
  --sans: "Archivo", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;

  /* space (4pt base) */
  --s-2: 0.5rem; --s-3: 0.75rem; --s-4: 1rem; --s-6: 1.5rem;
  --s-8: 2rem; --s-12: 3rem; --s-16: 4rem; --s-24: 6rem;
  --sect: clamp(5rem, 12vw, 9rem);

  /* motion */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);

  /* z */
  --z-nav: 10;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 400;
  font-size: 1.0625rem;
  line-height: 1.65;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2 { text-wrap: balance; line-height: 1.08; margin: 0 0 var(--s-6); }
p { margin: 0 0 var(--s-4); }
.measure { max-width: 62ch; }

h2 {
  font-size: clamp(1.9rem, 4.5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

a { color: var(--brand); text-underline-offset: 3px; }
a:hover { color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 2px;
}

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

/* ---------- top nav ---------- */

.top {
  position: sticky; top: 0; z-index: var(--z-nav);
  display: flex; justify-content: space-between; align-items: baseline;
  padding: var(--s-4) clamp(var(--s-4), 5vw, var(--s-12));
  background: color-mix(in oklch, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid color-mix(in oklch, var(--line) 50%, transparent);
}

.wordmark {
  font-weight: 800; font-size: 1.15rem; letter-spacing: -0.01em;
  color: var(--ink); text-decoration: none;
}
.wordmark:hover { color: var(--brand); }

.top nav { display: flex; gap: var(--s-6); }
.top nav a {
  color: var(--muted); text-decoration: none; font-size: 0.95rem; font-weight: 500;
}
.top nav a:hover { color: var(--ink); }

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

/* full-page memory field: fixed behind everything, content stacks above */
#field {
  position: fixed; inset: 0; width: 100vw; height: 100vh;
  z-index: 0;
  opacity: 0.5;
  pointer-events: none;
}
.top, main, .foot { position: relative; z-index: 1; }

.hero {
  min-height: min(92vh, 60rem);
  display: grid; align-items: center; justify-items: center;
  padding: var(--s-16) clamp(var(--s-4), 5vw, var(--s-12));
  text-align: center;
}

.hero-inner { max-width: 46rem; }

.hero h1 {
  font-size: clamp(2.6rem, 7vw, 5.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--s-6);
}
.hero h1 .l1, .hero h1 .l2 { display: block; }
.hero h1 .l2 { color: var(--brand); }

.lede {
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
  color: var(--muted);
  max-width: 40rem;
  margin-inline: auto;
  margin-bottom: var(--s-8);
  line-height: 1.6;
}

.install {
  display: inline-flex; align-items: center; gap: var(--s-4);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: var(--s-3) var(--s-4);
  margin-bottom: var(--s-4);
}
.install code { font-family: var(--mono); font-size: 1rem; color: var(--ink); }
.install button {
  font: 500 0.85rem var(--sans);
  color: var(--brand);
  background: none; border: 1px solid var(--brand-dim);
  border-radius: 5px; padding: 0.25rem 0.7rem;
  cursor: pointer;
  transition: background 150ms var(--ease), color 150ms var(--ease);
}
.install button:hover { background: var(--brand); color: var(--bg); }

.facts { color: var(--muted); font-size: 0.9rem; font-family: var(--mono); }

/* hero entrance */
.hero .l1, .hero .l2, .hero .lede, .hero .install, .hero .facts {
  animation: rise 700ms var(--ease) backwards;
}
.hero .l2 { animation-delay: 90ms; }
.hero .lede { animation-delay: 200ms; }
.hero .install { animation-delay: 300ms; }
.hero .facts { animation-delay: 380ms; }

@keyframes rise {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: none; }
}

/* ---------- problem ---------- */

/* centered single-column text sections */
.problem .measure, .notfor .measure, .demo-head.measure {
  margin-inline: auto;
  text-align: center;
}
.anywhere > h2, .anywhere-note, .cases > h2 {
  margin-inline: auto;
  text-align: center;
}
.runtime-list, .cases-grid { margin-inline: auto; }

.problem {
  padding: var(--sect) clamp(var(--s-4), 5vw, var(--s-12));
  border-top: 1px solid var(--line);
}
.problem .counter {
  font-size: clamp(1.3rem, 2.6vw, 1.8rem);
  font-weight: 700;
  color: var(--brand);
  margin-top: var(--s-8);
}

/* ---------- verbs ---------- */

.verbs {
  padding: var(--sect) clamp(var(--s-4), 5vw, var(--s-12));
  background: color-mix(in oklch, var(--surface) 80%, transparent);
  border-block: 1px solid var(--line);
}
.verbs-grid {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: clamp(var(--s-8), 6vw, var(--s-24));
  align-items: center;
  max-width: 72rem; margin-inline: auto;
}
.verbs-copy p { color: var(--muted); }
.verbs-copy strong { color: var(--ink); font-weight: 700; }
.verbs-copy .aside { font-size: 0.95rem; margin-top: var(--s-6); }

.code {
  margin: 0;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: var(--s-6);
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.84rem;
  line-height: 1.7;
}
/* inline-block, not block: inside <pre> the source newline already breaks
   the line; a block element would double every gap */
.code .ln { display: inline-block; min-width: 100%; }

.code { scrollbar-color: var(--line) transparent; scrollbar-width: thin; }
.code::-webkit-scrollbar { height: 8px; }
.code::-webkit-scrollbar-thumb { background: var(--line); border-radius: 4px; }
.code::-webkit-scrollbar-track { background: transparent; }
.code .kw { color: var(--brand); }
.code .st { color: var(--ok); }
.code .fn { color: oklch(0.85 0.09 250); }
.code .nu { color: oklch(0.82 0.12 60); }

/* line reveal when scrolled into view */
.code.inview .ln {
  animation: lineIn 400ms var(--ease) backwards;
  animation-delay: calc(var(--i) * 45ms);
}
@keyframes lineIn {
  from { opacity: 0; transform: translateX(10px); }
  to { opacity: 1; transform: none; }
}

/* ---------- demo ---------- */

.demo { padding: var(--sect) clamp(var(--s-4), 5vw, var(--s-12)); }
.demo-head p { color: var(--muted); }
.demo-head em { color: var(--brand); font-style: normal; font-weight: 700; }

.demo-panel {
  max-width: 44rem;
  margin-inline: auto;
  margin-top: var(--s-12);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: clamp(var(--s-6), 4vw, var(--s-12));
}

.demo-boot { text-align: center; padding: var(--s-8) 0; }
#demo-load {
  font: 700 1.05rem var(--sans);
  color: var(--bg);
  background: var(--brand);
  border: none; border-radius: 8px;
  padding: var(--s-4) var(--s-8);
  cursor: pointer;
  transition: transform 150ms var(--ease), background 150ms var(--ease);
}
#demo-load:hover { background: var(--brand-strong); transform: translateY(-1px); }
#demo-load:active { transform: scale(0.98); }
.demo-note { color: var(--muted); font-size: 0.9rem; max-width: 34rem; margin: var(--s-4) auto 0; }

.demo-status {
  font-family: var(--mono); font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: var(--s-6);
}
.demo-status.ok { color: var(--ok); }
.demo-status.err { color: oklch(0.75 0.16 25); }

.demo-label {
  display: block;
  font-size: 0.85rem; font-weight: 700;
  letter-spacing: 0.04em; text-transform: uppercase;
  color: var(--muted);
  margin: var(--s-6) 0 var(--s-2);
}
.demo-ui input {
  width: 100%;
  font: 400 1rem var(--sans);
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: var(--s-3) var(--s-4);
  transition: border-color 150ms var(--ease);
}
.demo-ui input::placeholder { color: oklch(0.60 0.02 280); }
.demo-ui input:focus { border-color: var(--brand); outline: none; }

.demo-results { list-style: none; padding: 0; margin: var(--s-6) 0 0; }
.demo-results li {
  display: flex; justify-content: space-between; gap: var(--s-4);
  padding: var(--s-3) var(--s-4);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: var(--s-2);
  animation: rise 350ms var(--ease) backwards;
}
.demo-results .score { font-family: var(--mono); color: var(--brand); white-space: nowrap; }
.demo-results .none { color: var(--muted); border-style: dashed; }

/* ---------- graph ---------- */

.graph {
  padding: var(--sect) clamp(var(--s-4), 5vw, var(--s-12));
  background: color-mix(in oklch, var(--surface) 80%, transparent);
  border-block: 1px solid var(--line);
}
.graph-grid {
  display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  gap: clamp(var(--s-8), 6vw, var(--s-24));
  align-items: center;
  max-width: 72rem; margin-inline: auto;
}
.graph-copy p { color: var(--muted); }
.graph-copy em { color: var(--ink); font-style: normal; font-weight: 700; }
.formula {
  font-family: var(--mono);
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: var(--s-4) var(--s-6);
  display: inline-block;
}
.formula code { color: var(--brand); }

.graph-fig { margin: 0; }
.graph-fig svg { width: 100%; height: auto; display: block; }
.graph-fig figcaption {
  color: var(--muted); font-size: 0.9rem;
  margin-top: var(--s-4);
}

.g-mem rect { fill: var(--bg); stroke: var(--line); }
.g-mem text, .g-ent text, .g-query text {
  fill: var(--muted); font: 500 12px var(--mono);
}
.g-ent text { text-anchor: middle; }
.g-ent circle { fill: var(--bg); stroke: var(--brand-dim); stroke-width: 1.5; }
.g-query text { fill: var(--brand); text-anchor: middle; font-size: 14px; }

.g-link { stroke: var(--line); stroke-width: 1.5; }
.g-hot { stroke: var(--brand); stroke-width: 2.5; filter: drop-shadow(0 0 6px var(--brand-dim)); }

/* animate on inview */
.graph-fig .g-link { stroke-dasharray: 260; stroke-dashoffset: 260; }
.graph-fig.inview .g-link {
  animation: draw 900ms var(--ease) forwards;
  animation-delay: calc(var(--i, 0) * 120ms);
}
.graph-fig .g-hot { animation-delay: 700ms !important; }
.graph-fig.inview .g-hot-ent circle,
.graph-fig.inview .g-target rect {
  animation: lightUp 600ms var(--ease) 1100ms forwards;
}
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes lightUp {
  to { stroke: var(--brand); stroke-width: 2.5; filter: drop-shadow(0 0 8px var(--brand-dim)); }
}

/* ---------- anywhere ---------- */

.anywhere { padding: var(--sect) clamp(var(--s-4), 5vw, var(--s-12)); }

.runtime-list {
  list-style: none; padding: 0;
  margin: var(--s-12) auto;
  max-width: 56rem;
}
.runtime-list li {
  display: grid; grid-template-columns: minmax(9rem, 14rem) 1fr;
  gap: var(--s-6);
  padding: var(--s-4) 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.runtime-list li:first-child { border-top: 1px solid var(--line); }
.runtime-list b { font-size: 1.2rem; font-weight: 700; }
.runtime-list span { color: var(--muted); }
.runtime-list code { font-family: var(--mono); font-size: 0.9em; color: var(--brand); }

.anywhere-note { color: var(--muted); }

/* ---------- use cases ---------- */

.cases { padding: var(--sect) clamp(var(--s-4), 5vw, var(--s-12)); }

.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--s-8) clamp(var(--s-8), 5vw, var(--s-16));
  max-width: 72rem;
  margin-top: var(--s-12);
}

.case { border-top: 1px solid var(--line); padding-top: var(--s-6); }
.case h3 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 var(--s-3);
}
.case p { color: var(--muted); font-size: 0.98rem; margin: 0; }
.case code { font-family: var(--mono); font-size: 0.9em; color: var(--brand); }

/* ---------- notfor ---------- */

.notfor {
  padding: var(--sect) clamp(var(--s-4), 5vw, var(--s-12));
  background: color-mix(in oklch, var(--surface) 80%, transparent);
  border-top: 1px solid var(--line);
}
.notfor p { color: var(--muted); }
.notfor em { color: var(--ink); font-style: normal; font-weight: 700; }

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

.foot {
  padding: var(--s-16) clamp(var(--s-4), 5vw, var(--s-12)) var(--s-12);
  border-top: 1px solid var(--line);
  display: grid; gap: var(--s-4);
  justify-items: center; text-align: center;
}
.foot nav { justify-content: center; }
.foot-note { margin-inline: auto; }
.foot-brand { font-weight: 800; font-size: 1.1rem; margin: 0; }
.foot nav { display: flex; gap: var(--s-6); }
.foot nav a { color: var(--muted); text-decoration: none; }
.foot nav a:hover { color: var(--brand); }
.foot-note { color: oklch(0.60 0.02 280); font-size: 0.9rem; max-width: 46ch; margin: 0; }

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

@media (max-width: 800px) {
  .verbs-grid, .graph-grid { grid-template-columns: 1fr; }
  .graph-fig { order: 2; }
  .runtime-list li { grid-template-columns: 1fr; gap: var(--s-2); }
  .top nav { gap: var(--s-4); }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
  }
  #field { display: none; }
}