/* pdfmd — landing page. No fonts, no frameworks, no requests. */

:root {
  color-scheme: dark;

  --bg: #08090b;
  --bg-soft: #0d0f13;
  --panel: #101319;
  --panel-2: #141821;
  --ink: #eceef2;
  --ink-dim: #b6bcc7;
  --muted: #7d848f;
  --rule: #1e232c;
  --rule-soft: #171b22;
  --accent: #ff6a3d;
  --accent-soft: rgba(255, 106, 61, 0.14);
  --mint: #4fd1a5;
  --violet: #9d8cff;

  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  --max: 66rem;
  --radius: 14px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

:root[data-theme="light"] {
  color-scheme: light;

  --bg: #fbfaf8;
  --bg-soft: #f4f2ee;
  --panel: #ffffff;
  --panel-2: #f6f4f0;
  --ink: #14161a;
  --ink-dim: #3a3f48;
  --muted: #6b7280;
  --rule: #e2ded6;
  --rule-soft: #ece8e1;
  --accent: #d1400f;
  --accent-soft: rgba(209, 64, 15, 0.1);
  --mint: #12855f;
  --violet: #6247d6;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Ambient wash behind the fold: warm at the top, gone by the first section. */
body::before {
  content: "";
  position: fixed;
  inset: 0 0 auto;
  height: 70vh;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(60rem 30rem at 18% -12%, var(--accent-soft), transparent 65%),
    radial-gradient(45rem 26rem at 95% -18%, rgba(157, 140, 255, 0.12), transparent 70%);
}

.page {
  position: relative;
  z-index: 1;
  width: min(var(--max), calc(100% - 2.5rem));
  margin: 0 auto;
}

a {
  color: var(--accent);
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
}

:where(a, button, summary):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

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

.skip {
  position: absolute;
  left: -999px;
  top: 0;
}

.skip:focus {
  left: 1rem;
  top: 1rem;
  z-index: 20;
  padding: 0.5rem 0.8rem;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 8px;
  text-decoration: none;
}

/* ---------------------------------------------------------------- header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease);
}

.site-header.is-stuck {
  border-bottom-color: var(--rule);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 3.75rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}

.wordmark .glyph {
  display: grid;
  place-items: center;
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 7px;
  background: linear-gradient(150deg, var(--accent), #ff9a5c);
  color: #14100e;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.wordmark b {
  color: var(--accent);
  font-weight: 700;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  margin-left: auto;
  font-size: 0.85rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s var(--ease);
}

.site-nav a:hover {
  color: var(--ink);
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  padding: 0;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 9px;
  cursor: pointer;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease),
    background 0.15s var(--ease);
}

.icon-btn:hover {
  color: var(--ink);
  border-color: var(--muted);
  background: var(--panel);
}

.icon-btn svg {
  width: 1rem;
  height: 1rem;
}

:root[data-theme="light"] .theme-toggle .moon,
.theme-toggle .sun {
  display: none;
}

:root[data-theme="light"] .theme-toggle .sun {
  display: block;
}

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

.hero {
  padding: 4.5rem 0 1rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.3rem 0.7rem 0.3rem 0.55rem;
  margin: 0 0 1.5rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--ink-dim);
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 999px;
}

.badge .dot {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--mint) 18%, transparent);
}

.badge .sep {
  color: var(--rule);
}

.hero h1 {
  margin: 0 0 1.1rem;
  max-width: 18ch;
  font-size: clamp(2.4rem, 6.2vw, 4.1rem);
  font-weight: 620;
  line-height: 1.03;
  letter-spacing: -0.035em;
}

.hero h1 em {
  position: relative;
  font-style: normal;
  color: var(--accent);
}

.lede {
  margin: 0 0 2rem;
  max-width: 46ch;
  font-size: clamp(1.02rem, 2.4vw, 1.18rem);
  color: var(--ink-dim);
}

.lede code {
  padding: 0.1em 0.35em;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 5px;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.copy-cmd {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.7rem 0.6rem 0.95rem;
  font-family: var(--mono);
  font-size: 0.84rem;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 10px;
  cursor: pointer;
  transition: border-color 0.15s var(--ease), transform 0.1s var(--ease);
}

.copy-cmd:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.copy-cmd .prompt {
  color: var(--accent);
}

.copy-cmd .label {
  padding: 0.15rem 0.45rem;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--panel-2);
  border-radius: 6px;
}

.copy-cmd.is-copied .label {
  color: var(--mint);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.62rem 1rem;
  font-family: var(--mono);
  font-size: 0.84rem;
  color: var(--ink-dim);
  text-decoration: none;
  border: 1px solid var(--rule);
  border-radius: 10px;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease),
    transform 0.1s var(--ease);
}

.btn-ghost:hover {
  color: var(--ink);
  border-color: var(--muted);
  transform: translateY(-1px);
}

.btn-ghost svg {
  width: 1rem;
  height: 1rem;
}

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

.demo {
  display: grid;
  grid-template-columns: 1fr 4.5rem 1fr;
  align-items: stretch;
  margin-top: 3.25rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel), var(--bg-soft));
  overflow: hidden;
}

.pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.pane-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 0.9rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--rule-soft);
}

.pane-head .tag {
  margin-left: auto;
  text-transform: none;
  letter-spacing: 0;
  color: var(--muted);
}

/* Flex, not a fixed height: the markdown sets the row and the sheet fills it. */
.pane-body {
  position: relative;
  flex: 1;
  min-height: 13rem;
  padding: 1rem 1.1rem;
  overflow: hidden;
}

/* Left pane: a schematic PDF page drawn out of divs. */
.sheet {
  display: flex;
  flex-direction: column;
  gap: 0.42rem;
  height: 100%;
}

.sheet i {
  display: block;
  height: 0.42rem;
  border-radius: 2px;
  background: currentColor;
  color: var(--rule);
  opacity: 0.95;
}

.sheet .t {
  height: 0.72rem;
  width: 62%;
  color: var(--muted);
  opacity: 0.55;
}

.sheet .cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.42rem 1.1rem;
  margin-top: 0.15rem;
}

.sheet .grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.3rem;
  margin-top: 0.5rem;
  padding: 0.45rem;
  border: 1px dashed var(--rule);
  border-radius: 6px;
}

.sheet .grid i {
  height: 0.34rem;
}

.scan {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 42%;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    transparent,
    color-mix(in srgb, var(--accent) 14%, transparent) 70%,
    color-mix(in srgb, var(--accent) 55%, transparent)
  );
  opacity: 0;
}

.demo.is-running .scan {
  animation: scan 1.15s var(--ease) forwards;
}

@keyframes scan {
  0% {
    transform: translateY(-45%);
    opacity: 0.9;
  }
  85% {
    opacity: 0.9;
  }
  100% {
    transform: translateY(240%);
    opacity: 0;
  }
}

/* Middle rail: the arrow and the clock. */
.rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.5rem 0;
  border-left: 1px solid var(--rule-soft);
  border-right: 1px solid var(--rule-soft);
  background: color-mix(in srgb, var(--bg) 35%, transparent);
}

.rail .arrow {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  color: var(--accent);
  border: 1px solid var(--rule);
  border-radius: 50%;
  background: var(--panel);
}

.rail .arrow svg {
  width: 0.95rem;
  height: 0.95rem;
}

.demo.is-running .rail .arrow {
  animation: pulse 1.15s var(--ease);
}

@keyframes pulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 transparent;
  }
  40% {
    box-shadow: 0 0 0 8px var(--accent-soft);
  }
}

.rail .clock {
  font-family: var(--mono);
  font-size: 0.74rem;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.rail .unit {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: -0.55rem;
}

.replay {
  padding: 0.2rem 0.5rem;
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease);
}

.replay:hover {
  color: var(--ink);
  border-color: var(--muted);
}

/* Right pane: the markdown, revealed line by line. */
.md {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.76rem;
  line-height: 1.75;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--ink-dim);
}

.md .ln {
  display: block;
  min-height: 1.33em;
}

/* Only hidden once JS has armed the reveal — no script, no blank pane. */
.demo.is-armed .md .ln {
  opacity: 0;
  transform: translateY(3px);
}

.demo.is-running .md .ln {
  animation: reveal 0.24s var(--ease) forwards;
  animation-delay: calc(var(--i) * 0.055s + 0.15s);
}

@keyframes reveal {
  to {
    opacity: 1;
    transform: none;
  }
}

.md .h {
  color: var(--accent);
  font-weight: 600;
}

.md .b {
  color: var(--ink);
}

.md .p {
  color: var(--violet);
}

.md .g {
  color: var(--mint);
}

.demo-note {
  margin: 0.75rem 0 0;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--muted);
}

/* ------------------------------------------------------------- stat strip */

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 3.5rem 0 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
}

.stats div {
  padding: 1.15rem 1.2rem;
}

.stats div + div {
  border-left: 1px solid var(--rule);
}

.stats b {
  display: block;
  font-family: var(--mono);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.stats span {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.78rem;
  color: var(--muted);
}

/* --------------------------------------------------------------- sections */

section {
  padding: 4.5rem 0 0;
  scroll-margin-top: 5rem;
}

.sec-head {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  margin-bottom: 1.35rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--rule);
}

.sec-head .idx {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
}

.sec-head h2 {
  margin: 0;
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.sec-head p {
  margin: 0 0 0 auto;
  font-size: 0.85rem;
  color: var(--muted);
  text-align: right;
}

section > p {
  margin: 0 0 1rem;
  max-width: 64ch;
  color: var(--ink-dim);
}

section > p code,
li code {
  padding: 0.1em 0.3em;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 5px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

/* ------------------------------------------------------------ code blocks */

.code {
  margin: 0;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
}

.code-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0.7rem 0.55rem 0.9rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  background: var(--panel-2);
  border-bottom: 1px solid var(--rule);
}

.code-head .copy {
  margin-left: auto;
  padding: 0.2rem 0.5rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease);
}

.code-head .copy:hover {
  color: var(--ink);
  border-color: var(--rule);
}

.code-head .copy.is-copied {
  color: var(--mint);
}

.code pre {
  margin: 0;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--ink);
}

.code .c {
  color: var(--muted);
}

.code .k {
  color: var(--violet);
}

.code .f {
  color: var(--accent);
}

.code .s {
  color: var(--mint);
}

/* ------------------------------------------------------------ performance */

.perf {
  margin-top: 1.25rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

th,
td {
  padding: 0.7rem 1rem;
  text-align: left;
  vertical-align: middle;
  white-space: nowrap;
}

thead th {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--panel-2);
  border-bottom: 1px solid var(--rule);
}

tbody tr + tr td {
  border-top: 1px solid var(--rule-soft);
}

tbody td:not(:first-child) {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

td.ours {
  color: var(--mint);
}

.bar-cell {
  width: 38%;
  min-width: 8rem;
}

.bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.bar .track {
  flex: 1;
  height: 0.4rem;
  border-radius: 999px;
  background: var(--panel-2);
  overflow: hidden;
}

.bar .fill {
  display: block;
  height: 100%;
  width: var(--w);
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), #ffab5e);
  transform-origin: left;
  animation: grow 0.7s var(--ease) both;
}

@keyframes grow {
  from {
    transform: scaleX(0);
  }
}

.bar .num {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink);
}

.footnote {
  margin: 0.85rem 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ------------------------------------------------------------- how it works */

.pipeline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 1.25rem;
}

.pipeline span {
  padding: 0.35rem 0.7rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--ink-dim);
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 999px;
}

.pipeline .sep {
  padding: 0;
  color: var(--muted);
  background: none;
  border: 0;
}

.arch {
  margin: 0;
  padding: 1.1rem 1.2rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.8;
  color: var(--ink-dim);
  white-space: pre;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.arch b {
  color: var(--ink);
  font-weight: 500;
}

.arch i {
  color: var(--muted);
  font-style: normal;
}

/* ------------------------------------------------------------- limitations */

.limits {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.limits li {
  padding: 0.95rem 1.1rem;
  font-size: 0.9rem;
  color: var(--ink-dim);
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 12px;
}

.limits li::before {
  content: "—";
  margin-right: 0.5rem;
  color: var(--accent);
}

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

.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  margin-top: 5rem;
  padding: 1.5rem 0 2.5rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--muted);
}

.site-footer a {
  color: var(--muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--ink);
}

.site-footer nav {
  display: flex;
  gap: 1.1rem;
}

/* --------------------------------------------------------------- 404 page */

.missing {
  display: grid;
  align-content: center;
  min-height: 72vh;
  padding: 4rem 0;
}

/* Grid items blockify, so pin the pill and the buttons to the left edge. */
.missing > .badge,
.missing > .cta {
  justify-self: start;
}

.missing h1 {
  margin: 0.75rem 0 0.6rem;
  font-size: clamp(1.9rem, 5vw, 2.8rem);
  font-weight: 620;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.missing p {
  margin: 0 0 1.5rem;
  max-width: 46ch;
  color: var(--ink-dim);
}

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

@media (max-width: 860px) {
  .demo {
    grid-template-columns: 1fr;
  }

  .rail {
    flex-direction: row;
    gap: 0.9rem;
    padding: 0.6rem 0;
    border: 0;
    border-top: 1px solid var(--rule-soft);
    border-bottom: 1px solid var(--rule-soft);
  }

  .rail .arrow {
    transform: rotate(90deg);
  }

  .rail .unit {
    margin-top: 0;
  }

  .grid-2,
  .limits {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .site-nav {
    gap: 1rem;
    font-size: 0.8rem;
  }

  .site-nav .hide-sm {
    display: none;
  }

  .hero {
    padding: 3rem 0 2.5rem;
  }

  .stats {
    grid-template-columns: 1fr 1fr;
  }

  .stats div:nth-child(odd) {
    border-left: 0;
  }

  .stats div:nth-child(n + 3) {
    border-top: 1px solid var(--rule);
  }

  .sec-head {
    flex-wrap: wrap;
  }

  .sec-head p {
    margin-left: 0;
    text-align: left;
    flex-basis: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .demo.is-armed .md .ln {
    opacity: 1;
    transform: none;
  }
}