/* ---------------------------------------------------------------------------
   Detangle — one stylesheet, no framework, no build step, no fetched fonts.

   The site is built the way the product is: nothing is downloaded from anywhere
   else, and everything here is legible to somebody reading the source. Layout is
   grid and flex; depth comes from static gradients rather than from motion.
   --------------------------------------------------------------------------- */

:root {
  --bg: #0a0c11;
  --panel: #15181f;
  --elevated: #1c212b;
  --raised: #232935;
  --sunken: #070910;
  --border: #20252f;
  --border-strong: #323a4a;

  --text: #e6e9ef;
  --dim: #8a92a3;
  --faint: #5c6473;

  /* Amber, not blue: "untangling" is a warm idea, and the category is full of blue. */
  --accent: #e0a33a;
  --accent-hover: #f0b855;

  --green: #3fb950;
  --orange: #d29922;
  --red: #f85149;
  --purple: #a371f7;

  --shadow: rgba(0, 0, 0, 0.55);
  --glow: rgba(224, 163, 58, 0.16);

  --radius: 10px;
  --page: 1120px;

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, Roboto, "Helvetica Neue", sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Mono", Menlo, Consolas, monospace;
}

/* No stored preference means follow the operating system; an explicit choice wins. */
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --bg: #f6f7f9;
    --panel: #ffffff;
    --elevated: #ffffff;
    --raised: #f0f2f6;
    --sunken: #eceff4;
    --border: #dfe3ea;
    --border-strong: #c4cbd6;
    --text: #1b1f27;
    --dim: #59616f;
    --faint: #858d9c;
    --shadow: rgba(15, 20, 30, 0.1);
    --glow: rgba(224, 163, 58, 0.13);
  }
}

:root[data-theme="light"] {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --elevated: #ffffff;
  --raised: #f0f2f6;
  --sunken: #eceff4;
  --border: #dfe3ea;
  --border-strong: #c4cbd6;
  --text: #1b1f27;
  --dim: #59616f;
  --faint: #858d9c;
  --shadow: rgba(15, 20, 30, 0.1);
  --glow: rgba(224, 163, 58, 0.13);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 78px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}

/* Motion is limited to .15s state transitions; there are no keyframes anywhere. */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    transition: none !important;
  }
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

code {
  font-family: var(--mono);
  font-size: 0.92em;
}

.wrap {
  max-width: var(--page);
  margin: 0 auto;
  padding: 0 22px;
}

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

header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 60px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
}

header .wrap {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 22px;
}

.wordmark {
  font-size: 17px;
  font-weight: 660;
  letter-spacing: -0.03em;
  color: var(--text);
}

.wordmark span {
  color: var(--accent);
}

.wordmark:hover {
  text-decoration: none;
}

nav {
  display: flex;
  gap: 18px;
  margin-left: auto;
  align-items: center;
}

nav a {
  color: var(--dim);
  font-size: 14px;
  transition: color 0.15s;
}

nav a:hover {
  color: var(--text);
  text-decoration: none;
}

/* No hamburger. Below 720px the section anchors simply step aside. */
@media (max-width: 720px) {
  nav a:not(.persist) {
    display: none;
  }
}

.toggle {
  border: 1px solid var(--border-strong);
  background: var(--panel);
  color: var(--dim);
  border-radius: 999px;
  padding: 4px 10px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

.toggle:hover {
  border-color: var(--accent);
  color: var(--text);
}

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

.hero {
  position: relative;
  padding: 76px 0 40px;
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -30% 0 auto 0;
  height: 620px;
  background: radial-gradient(ellipse 60% 50% at 50% 40%, var(--glow), transparent 70%);
  pointer-events: none;
}

.hero .wrap {
  position: relative;
  max-width: 820px;
}

.pill {
  display: inline-block;
  border: 1px solid var(--border-strong);
  background: var(--panel);
  border-radius: 999px;
  padding: 5px 14px;
  color: var(--dim);
  font-size: 13px;
  margin-bottom: 22px;
}

h1 {
  margin: 0 0 18px;
  font-size: clamp(42px, 6.6vw, 78px);
  line-height: 1.04;
  letter-spacing: -0.035em;
  font-weight: 660;
}

h1 em {
  color: var(--accent);
  font-style: normal;
}

.capability {
  margin: 0 auto 18px;
  max-width: 640px;
  font-size: clamp(17px, 2.2vw, 21px);
  color: var(--text);
  font-weight: 550;
}

.lede {
  margin: 0 auto 30px;
  max-width: 660px;
  color: var(--dim);
}

.cta-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 8px;
  padding: 11px 20px;
  font-size: 15px;
  font-weight: 630;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.15s;
}

.button.primary {
  background: var(--accent);
  color: #14100a;
}

.button.primary:hover {
  background: var(--accent-hover);
  text-decoration: none;
}

.button.ghost {
  border-color: var(--border-strong);
  color: var(--text);
  background: var(--panel);
}

.button.ghost:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.micro {
  margin: 16px 0 0;
  color: var(--faint);
  font-size: 13px;
}

/* --- the resolution panel: the product's own output as the hero visual ------ */

.shot {
  position: relative;
  max-width: 1240px;
  margin: 46px auto 0;
  padding: 0 22px;
}

.window {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: 0 24px 60px -30px var(--shadow);
  overflow: hidden;
  text-align: left;
}

.chrome {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--elevated);
}

.dot {
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: var(--border-strong);
}

.chrome .title {
  color: var(--faint);
  font-size: 12px;
  font-family: var(--mono);
  margin-left: 6px;
}

.chrome .copy {
  margin-left: auto;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--dim);
  border-radius: 6px;
  padding: 3px 10px;
  font: inherit;
  font-size: 12px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

.chrome .copy:hover {
  border-color: var(--accent);
  color: var(--text);
}

pre.log {
  margin: 0;
  padding: 18px 16px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.75;
  background: var(--sunken);
  color: var(--text);
}

pre.log .src {
  color: var(--text);
}

pre.log .arrow,
pre.log .prompt {
  color: var(--faint);
  user-select: none;
}

pre.log .dst {
  color: var(--dim);
}

.rule {
  font-size: 12px;
}

.rule.exact {
  color: var(--green);
}

.rule.normalized {
  color: var(--accent);
}

.rule.heuristic {
  color: var(--purple);
}

.rule.ambiguous {
  color: var(--orange);
}

.rule.unresolved {
  color: var(--red);
}

figcaption {
  margin-top: 12px;
  color: var(--faint);
  font-size: 13px;
  text-align: center;
}

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

section {
  border-top: 1px solid var(--border);
  padding: 76px 0;
}

.section-head {
  max-width: 660px;
  margin-bottom: 40px;
}

h2 {
  margin: 0 0 14px;
  font-size: clamp(28px, 3.8vw, 41px);
  line-height: 1.15;
  letter-spacing: -0.025em;
  font-weight: 630;
}

.section-head p {
  margin: 0;
  color: var(--dim);
}

.label {
  display: block;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--faint);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 40px;
  align-items: start;
}

.split.reverse {
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
}

@media (max-width: 900px) {
  .split,
  .split.reverse {
    grid-template-columns: 1fr;
  }
}

.points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.points h3 {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 630;
}

.points p {
  margin: 0;
  color: var(--dim);
  font-size: 15px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 22px;
  transition: border-color 0.15s, transform 0.15s;
}

.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 630;
}

.card p {
  margin: 0;
  color: var(--dim);
  font-size: 15px;
}

/* --- formats grid ---------------------------------------------------------- */

.formats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.formats div {
  background: var(--panel);
  padding: 16px 18px;
}

.formats strong {
  display: block;
  font-weight: 630;
  font-size: 15px;
}

.formats span {
  color: var(--faint);
  font-family: var(--mono);
  font-size: 12px;
}

/* --- specs strip ----------------------------------------------------------- */

.specs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px;
  background: var(--border);
  border-block: 1px solid var(--border);
}

.specs div {
  background: var(--bg);
  padding: 26px 18px;
}

.specs strong {
  display: block;
  font-size: 26px;
  font-weight: 660;
  letter-spacing: -0.02em;
}

.specs span {
  color: var(--dim);
  font-size: 14px;
}

/* --- download panels ------------------------------------------------------- */

.os-panels {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
}

.os {
  border-top: 1px solid var(--border);
  padding: 22px;
}

.os:first-of-type {
  border-top: none;
}

.os h3 {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 630;
}

.os p {
  margin: 10px 0 0;
  color: var(--faint);
  font-size: 13px;
}

/* A step is instruction rather than footnote, so it reads at body colour. */
.os p.step {
  color: var(--dim);
  font-size: 14px;
}

.os .command + .step {
  margin-top: 16px;
}

.tabs {
  display: none;
  gap: 4px;
  padding: 10px 10px 0;
  border-bottom: 1px solid var(--border);
  background: var(--elevated);
}

/* Tabs exist only when the script runs; with JS off the panels stack and all of
   them stay readable, which is the point of building it this way round. */
.js-tabs .tabs {
  display: flex;
}

.js-tabs .os {
  display: none;
  border-top: none;
}

.js-tabs .os.active {
  display: block;
}

.tab {
  border: 1px solid transparent;
  border-bottom: none;
  background: transparent;
  color: var(--dim);
  padding: 8px 14px;
  border-radius: 8px 8px 0 0;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}

.tab[aria-selected="true"] {
  background: var(--panel);
  border-color: var(--border);
  color: var(--text);
}

.command {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--sunken);
  padding: 10px 12px;
  font-family: var(--mono);
  font-size: 13px;
  overflow-x: auto;
}

.command .prompt {
  color: var(--faint);
  user-select: none;
}

.command button {
  margin-left: auto;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--dim);
  border-radius: 6px;
  padding: 3px 10px;
  font: inherit;
  font-size: 12px;
  cursor: pointer;
}

.command button:hover {
  border-color: var(--accent);
  color: var(--text);
}

/* --- docs grid ------------------------------------------------------------- */

.doclinks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px 26px;
}

.doclinks a {
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.doclinks a:hover {
  color: var(--accent);
  text-decoration: none;
}

.doclinks span {
  display: block;
  color: var(--faint);
  font-size: 13px;
}

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

.demo-frame {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--panel);
  aspect-ratio: 16 / 10;
}

.demo-frame iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

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

footer {
  border-top: 1px solid var(--border);
  padding: 30px 0 50px;
  color: var(--faint);
  font-size: 14px;
}

footer .wrap {
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
}

footer nav {
  margin-left: auto;
}