/* Dioptra landing page. Tokens follow DESIGN.md §1: warm paper greys, graphite, one
   verdigris accent, Inter with tabular figures, no glow and no decorative gradients. */

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("assets/fonts/Inter-Regular.woff2") format("woff2");
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("assets/fonts/Inter-Medium.woff2") format("woff2");
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("assets/fonts/Inter-SemiBold.woff2") format("woff2");
}

:root {
  color-scheme: light;
  --bg: #F4F2ED;
  --band: #ECE9E2;
  --surface: #FBFAF7;
  --ink: #1D2120;
  --ink-2: #454B48;
  --ink-3: #626864;
  --rule: #D6D1C6;
  --rule-strong: #B9B3A6;
  --accent: #2E7D78;
  --accent-hover: #256964;
  --link: #246A65;
  --accent-ink: #FFFFFF;
  --accent-soft: #DDEBE9;
  --amber: #9A6A12;
  --shadow: 0 1px 0 rgba(29, 33, 32, 0.04);
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --gutter: 16px;
  --max: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #141716;
    --band: #191D1C;
    --surface: #1E2322;
    --ink: #E5E7E3;
    --ink-2: #B7BDB9;
    --ink-3: #959C98;
    --rule: #2D3331;
    --rule-strong: #434A47;
    --accent: #5FB3AD;
    --accent-hover: #74C2BC;
  --link: #5FB3AD;
    --accent-ink: #0E1312;
    --accent-soft: #1E3331;
    --amber: #D9A441;
    --shadow: none;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #141716;
  --band: #191D1C;
  --surface: #1E2322;
  --ink: #E5E7E3;
  --ink-2: #B7BDB9;
  --ink-3: #959C98;
  --rule: #2D3331;
  --rule-strong: #434A47;
  --accent: #5FB3AD;
  --accent-hover: #74C2BC;
  --link: #5FB3AD;
  --accent-ink: #0E1312;
  --accent-soft: #1E3331;
  --amber: #D9A441;
  --shadow: none;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--link); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { color: var(--accent-hover); }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 0.05em 0.3em;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}
@media (min-width: 720px) {
  :root { --gutter: 32px; }
}

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--surface);
  color: var(--ink);
  padding: 8px 12px;
  border: 1px solid var(--rule);
  z-index: 10;
}
.skip:focus { left: 8px; }

/* ---- Navigation ---- */

.top {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 5;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 56px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
}
.brand img { border-radius: 6px; }
.brand:hover { color: var(--ink); }
.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: var(--ink-2);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  padding: 6px 10px;
  border-radius: 4px;
}
.nav-links a:hover { color: var(--ink); background: var(--band); }
.nav-links a.nav-cta { color: var(--link); }
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-left: 4px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: transparent;
  color: var(--ink-2);
  cursor: pointer;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--rule-strong); }
@media (max-width: 420px) {
  .nav-links a { padding: 6px 7px; font-size: 14px; }
  .brand span { font-size: 16px; }
}

/* ---- Hero ---- */

.hero { padding-top: 72px; padding-bottom: 40px; }
.eyebrow {
  margin: 0 0 16px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
}
h1 {
  margin: 0;
  max-width: 17em;
  font-size: clamp(2rem, 1.2rem + 3.2vw, 3.25rem);
  line-height: 1.12;
  font-weight: 600;
  letter-spacing: -0.022em;
}
.lede {
  max-width: 40em;
  margin: 24px 0 0;
  font-size: 18px;
  line-height: 1.6;
  color: var(--ink-2);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 32px 0 0;
}
.scale {
  display: block;
  width: 100%;
  height: 24px;
  margin-top: 56px;
  stroke: var(--rule-strong);
  stroke-width: 1;
  shape-rendering: crispEdges;
}
.scale .major { stroke: var(--ink-3); }
.scale .mark { stroke: var(--accent); stroke-width: 2; }

/* ---- Buttons ---- */

.button {
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 11px 18px;
  border: 1px solid var(--rule-strong);
  border-radius: 4px;
  background: var(--surface);
  color: var(--ink);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.3;
  text-decoration: none;
  box-shadow: var(--shadow);
}
.button:hover { color: var(--ink); border-color: var(--ink-3); }
.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}
.button.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--accent-ink); }

/* ---- Sections ---- */

section { padding: 72px 0; }
.band { background: var(--band); border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.hero + .band { margin-top: 0; }

.section-head { margin-bottom: 32px; }
.label {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.label .num {
  font-family: var(--mono);
  color: var(--link);
  margin-right: 8px;
  letter-spacing: 0;
}
h2 {
  margin: 0;
  font-size: clamp(1.5rem, 1.15rem + 1.3vw, 2rem);
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.015em;
  max-width: 22em;
}
h3 { margin: 0; font-size: 18px; font-weight: 600; letter-spacing: -0.005em; }
.section-note { margin: 14px 0 0; color: var(--ink-2); max-width: 44em; }

.two-col { display: grid; gap: 8px 48px; }
@media (min-width: 900px) {
  .two-col { grid-template-columns: minmax(0, 1fr) minmax(0, 1.75fr); }
  .two-col > .section-head { margin-bottom: 0; }
}

.prose { max-width: 42em; }
.prose > p:first-child { margin-top: 0; }
.prose p { margin: 0 0 16px; color: var(--ink-2); }

.checks { list-style: none; margin: 8px 0 0; padding: 0; }
.checks li {
  position: relative;
  padding: 14px 0 14px 28px;
  border-top: 1px solid var(--rule);
  color: var(--ink-2);
}
.checks li:last-child { border-bottom: 1px solid var(--rule); }
.checks li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 23px;
  width: 12px;
  height: 1.5px;
  background: var(--accent);
}
.checks strong { color: var(--ink); font-weight: 600; }

/* ---- Download ---- */

.platforms {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.platform {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 6px;
}
.platform.is-mine { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.platform h3 { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.platform .yours {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--link);
}
.platform-note { margin: 0; font-size: 14px; color: var(--ink-3); }
.platform .button { width: 100%; flex-wrap: wrap; }
.dl-meta { font-size: 13px; font-weight: 400; opacity: 0.85; }
.dl-meta:empty { display: none; }
.alt { list-style: none; margin: 0; padding: 0; font-size: 14px; color: var(--ink-3); }
.alt li { padding: 4px 0; }
.alt a { font-weight: 500; }
.alt .dl-meta { color: var(--ink-3); margin-left: 6px; }
.fineprint { margin: 20px 0 0; font-size: 14px; color: var(--ink-3); max-width: 48em; }

/* ---- Captures ---- */

.capture { margin: 0; }
.capture img {
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--surface);
}
.capture figcaption, .plot figcaption {
  margin-top: 12px;
  font-size: 14px;
  color: var(--ink-3);
  max-width: 44em;
}
.capture figcaption strong { color: var(--ink); font-weight: 600; }
.capture.wide { margin-bottom: 40px; }
.capture-pair { display: grid; gap: 40px 24px; }
@media (min-width: 720px) {
  .capture-pair { grid-template-columns: 1fr 1fr; }
}

/* ---- Results-sheet quote ---- */

.sheet {
  margin: 0 0 24px;
  padding: 20px 22px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 6px;
}
.sheet p { margin: 0; }
.sheet-check {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--ink-2);
  padding-bottom: 14px;
  margin-bottom: 14px !important;
  border-bottom: 1px solid var(--rule);
}
.sheet-check .dot {
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--amber);
}
.sheet-line { font-size: 17px; color: var(--ink) !important; line-height: 1.55; }

/* ---- Publication ---- */

.figure-row { max-width: none; }
.plot-pair {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-bottom: 24px;
}
.plot-pair .plot { margin: 0; max-width: none; }
.plot-pair .plot img { width: 100%; height: auto; }
.plot {
  margin: 0 0 24px;
  max-width: 420px;
}
.plot img {
  background: #FFFFFF;
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 12px;
}

/* ---- Correctness figures ---- */

.figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--rule-strong);
}
.figures > div {
  padding: 20px 20px 22px 0;
  border-bottom: 1px solid var(--rule);
}
@media (min-width: 720px) {
  .figures > div + div { padding-left: 20px; border-left: 1px solid var(--rule); }
}
.figures dt {
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-3);
  letter-spacing: 0.01em;
}
.figures dd { margin: 8px 0 0; display: flex; flex-direction: column; gap: 2px; }
.figures .big {
  font-size: clamp(2rem, 1.6rem + 1.4vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--ink);
}
.figures .of { font-size: 14px; color: var(--ink-2); }
.wide-note { margin-top: 24px; }

/* ---- Terminal block ---- */

.term {
  margin: 24px 0 16px;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.6;
}
.term code { background: none; border: 0; padding: 0; font-size: inherit; color: var(--ink-2); }

/* ---- Footer ---- */

.foot { padding: 40px 0 56px; border-top: 1px solid var(--rule); }
.foot-grid { display: grid; gap: 20px; }
.foot-brand { display: flex; gap: 12px; align-items: center; color: var(--ink-3); font-size: 14px; }
.foot-brand p { margin: 0; }
.foot-brand img { border-radius: 5px; }
.foot-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  font-size: 15px;
}
.foot-links a { color: var(--ink-2); text-decoration: none; }
.foot-links a:hover { color: var(--link); text-decoration: underline; }
.foot-note { margin: 0; font-size: 13px; color: var(--ink-3); }
.foot-note a { color: var(--ink-3); }

@media (max-width: 719px) {
  section { padding: 56px 0; }
  .hero { padding-top: 48px; padding-bottom: 32px; }
  .lede { font-size: 17px; }
  .scale { margin-top: 40px; }
  .hero-actions .button { flex: 1 1 100%; }
}

/* Tabular figures where numbers align or are compared. */
.figures, .sheet, .dl-meta, .term, .tnum { font-variant-numeric: tabular-nums; }

/* ---- v0.2.0: the desk behind the hero, captures that follow the theme ---- */

.img-dark { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .img-light { display: none; }
  :root:not([data-theme="light"]) .img-dark { display: block; }
}
:root[data-theme="dark"] .img-light { display: none; }
:root[data-theme="dark"] .img-dark { display: block; }

.hero-desk {
  --grid-line: rgba(29, 33, 32, 0.045);
  --grid-major: rgba(29, 33, 32, 0.07);
  --glow: rgba(46, 125, 120, 0.10);
  background:
    radial-gradient(ellipse 70% 60% at 75% 70%, var(--glow), transparent 70%),
    linear-gradient(var(--grid-major) 1px, transparent 1px) 0 0 / 100px 100px,
    linear-gradient(90deg, var(--grid-major) 1px, transparent 1px) 0 0 / 100px 100px,
    linear-gradient(var(--grid-line) 1px, transparent 1px) 0 0 / 20px 20px,
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px) 0 0 / 20px 20px;
  border-bottom: 1px solid var(--rule);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .hero-desk {
    --grid-line: rgba(228, 225, 218, 0.03);
    --grid-major: rgba(228, 225, 218, 0.055);
    --glow: rgba(95, 179, 173, 0.14);
  }
}
:root[data-theme="dark"] .hero-desk {
  --grid-line: rgba(228, 225, 218, 0.03);
  --grid-major: rgba(228, 225, 218, 0.055);
  --glow: rgba(95, 179, 173, 0.14);
}
.hero-desk .hero { padding-bottom: 72px; }
.hero-desk + .band { border-top: 0; }

.hero-shot { margin: 48px 0 0; }
.hero-shot img {
  border: 1px solid var(--rule-strong);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.35), 0 2px 6px rgba(0, 0, 0, 0.08);
}
@media (max-width: 600px) {
  .hero-shot { margin-top: 32px; }
  .hero-shot img { border-radius: 6px; }
}

/* ---- Pricing and comparison pages ---- */

.nav-links a[aria-current="page"] { color: var(--ink); }
@media (max-width: 560px) {
  .nav-links .nav-wide { display: none; }
}
@media (max-width: 380px) {
  .brand span { display: none; }
}

.page-head { padding: 64px 0 40px; border-bottom: 1px solid var(--rule); }
.page-head h1 { font-size: clamp(1.9rem, 1.3rem + 2.4vw, 2.75rem); max-width: 20em; }
.page-head .lede { margin-top: 18px; }
.crumbs { margin: 0 0 14px; font-size: 14px; color: var(--ink-3); }
.crumbs a { color: var(--ink-3); }

.tiers { display: grid; gap: 16px; }
@media (min-width: 820px) { .tiers { grid-template-columns: 1fr 1fr; } }
.tier, .plan {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 6px;
}
.tier.free { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.tier h2 { font-size: 24px; }
.tier .price, .plan .price {
  margin: 0;
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.price .per { font-size: 15px; font-weight: 400; color: var(--ink-3); letter-spacing: 0; }
.tier p, .plan p { margin: 0; color: var(--ink-2); }
.tier .checks { margin-top: 4px; }
.tier .button, .plan .button { margin-top: auto; align-self: flex-start; }

.plan-group + .plan-group { margin-top: 40px; }
.plan-group > h3 { margin-bottom: 14px; }
.plans { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.plan h4 { margin: 0; font-size: 17px; font-weight: 600; }
.plan .for { font-size: 14px; color: var(--ink-3); }
.plan .button { width: 100%; }
.plan.featured { border-color: var(--rule-strong); }
.tag {
  display: inline-block;
  margin-left: 6px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--link);
  vertical-align: 1px;
}

.groups { display: grid; gap: 0 40px; }
@media (min-width: 820px) { .groups { grid-template-columns: 1fr 1fr; } }
.groups article { padding: 20px 0; border-top: 1px solid var(--rule); }
.groups h3 { font-size: 17px; margin-bottom: 8px; }
.groups p { margin: 0 0 8px; color: var(--ink-2); }
.groups .free-note { font-size: 14px; color: var(--ink-3); }
.groups .free-note strong { color: var(--ink-2); font-weight: 500; }

.faq { margin: 0; }
.faq dt { font-weight: 600; padding-top: 18px; border-top: 1px solid var(--rule); }
.faq dd { margin: 6px 0 18px; color: var(--ink-2); max-width: 42em; }

.table-scroll { overflow-x: auto; margin: 0 0 8px; border: 1px solid var(--rule); border-radius: 6px; background: var(--surface); }
.compare-table { width: 100%; border-collapse: collapse; font-size: 15px; min-width: 520px; }
.compare-table th, .compare-table td {
  text-align: left;
  vertical-align: top;
  padding: 10px 14px;
  border-bottom: 1px solid var(--rule);
}
.compare-table tr:last-child th, .compare-table tr:last-child td { border-bottom: 0; }
.compare-table thead th { font-size: 13px; font-weight: 600; color: var(--ink-3); letter-spacing: 0.02em; background: var(--band); }
.compare-table tbody th { font-weight: 500; color: var(--ink); width: 28%; }
.compare-table td { color: var(--ink-2); }
.compare-table .better { color: var(--ink); }
.compare-table .mark { color: var(--accent); font-size: 0.8em; }
@media (max-width: 600px) {
  .table-scroll { overflow: visible; border: 0; background: none; }
  .compare-table { min-width: 0; }
  .compare-table thead { display: none; }
  .compare-table tr { display: block; margin-bottom: 12px; background: var(--surface); border: 1px solid var(--rule); border-radius: 6px; }
  .compare-table tbody th { display: block; width: auto; background: var(--band); border-radius: 6px 6px 0 0; }
  .compare-table td { display: block; }
  .compare-table td::before { content: attr(data-label); display: block; font-size: 12px; font-weight: 600; color: var(--ink-3); letter-spacing: 0.02em; }
  .compare-table tr:last-child th { border-bottom: 1px solid var(--rule); }
  .compare-table tr td:last-child { border-bottom: 0; }
}
.table-key { font-size: 14px; color: var(--ink-3); margin: 8px 0 0; }

.sources { font-size: 14px; color: var(--ink-3); padding-left: 1.4em; margin: 0; max-width: 52em; }
.sources li { margin: 4px 0; overflow-wrap: anywhere; }
.compare-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.compare-list a { display: block; padding: 18px 20px; background: var(--surface); border: 1px solid var(--rule); border-radius: 6px; text-decoration: none; color: var(--ink); font-weight: 500; }
.compare-list a:hover { border-color: var(--accent); }
.compare-list span { display: block; font-size: 14px; font-weight: 400; color: var(--ink-3); margin-top: 4px; }
.prose h3 { margin: 28px 0 10px; }
.prose ul:not(.checks) { color: var(--ink-2); padding-left: 1.2em; }
.prose li { margin: 6px 0; }