/*
 * Landing page for Open Feed Sorter.
 *
 * The page wears the extension's own face: a monochrome dot-matrix LCD set in
 * Matrix Sans Screen, reflective in light mode and backlit in dark mode. The
 * panel colours are the ones in src/popup/popup.css and src/content/styles.css;
 * change them there first.
 *
 * Type sizes are multiples of 5px. Matrix Sans draws on a 0.1em dot grid, so at
 * those sizes every dot lands on whole device pixels on a 2x screen.
 */

@font-face {
  font-family: "Matrix Sans Screen";
  src: url("fonts/MatrixSansScreen-Regular.woff2") format("woff2");
  /* 9.5 KB and preloaded. Swapping from a fallback face would reflow the
     whole page, since no other font has these widths. */
  font-display: block;
}

:root {
  color-scheme: light;
  --lcd: #c7e3ab;
  --ink: #13200f;
  --dim: #4d6440;
  --ghost: rgba(19, 32, 15, 0.07);
  --unlit: rgba(19, 32, 15, 0.1);
  --shadow: rgba(19, 32, 15, 0.3);
  /* Secondary text on an inverted (ink) panel: 6.5:1. */
  --ink-dim: #91a87c;
  --ink-ghost: rgba(199, 227, 171, 0.07);
  /* Backlight bleed behind the hero; a reflective panel has none. */
  --glow: transparent;

  --font: "Matrix Sans Screen", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --gutter: 16px;
  --wide: 1200px;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --lcd: #0e170b;
    --ink: #b9e18f;
    --dim: #71905a;
    --ghost: rgba(185, 225, 143, 0.06);
    --unlit: rgba(185, 225, 143, 0.08);
    --shadow: rgba(0, 0, 0, 0.6);
    --ink-dim: #415433;
    --ink-ghost: rgba(14, 23, 11, 0.08);
    --glow: rgba(185, 225, 143, 0.07);
  }
}

@media (min-width: 700px) {
  :root { --gutter: 32px; }
}

/* ── base ────────────────────────────────────────────────────────────── */

* { box-sizing: border-box; }

html { scroll-padding-top: 20px; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background-color: var(--lcd);
  /* The unlit-pixel grid of an LCD, faint enough to read as texture. */
  background-image: radial-gradient(var(--ghost) 0.75px, transparent 1px);
  background-size: 3px 3px;
  color: var(--ink);
  font: 400 20px/1.5 var(--font);
  -webkit-font-smoothing: antialiased;
  text-size-adjust: 100%;
}

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

h1, h2, h3 { font-weight: 400; text-transform: uppercase; }

p { margin: 0 0 20px; }

a {
  color: inherit;
  text-decoration-line: underline;
  text-decoration-style: dotted;
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
}
a:hover { background: var(--ink); color: var(--lcd); text-decoration: none; }

:focus-visible {
  outline: 2px dashed var(--ink);
  outline-offset: 3px;
}

code {
  font: inherit;
  padding: 0 4px;
  border: 2px solid currentColor;
  overflow-wrap: anywhere;
}

pre code { padding: 0; border: 0; }

/* Wrap rather than scroll: a scrolling box is one more thing to reach by
   keyboard, and these are short enough to read wrapped on a phone. */
pre {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

/* Names of the extension's own buttons and messages, set the way the
   welcome page sets them: inverse video, never slanted — the font has no
   italic, and a synthesised one smears the dots. */
em {
  padding: 0 5px;
  background: var(--ink);
  color: var(--lcd);
  font-style: normal;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* Keeps "3.4x" lowercase inside uppercase headings, as it is on the tiles. */
.score { text-transform: none; }

.wrap {
  width: 100%;
  max-width: calc(var(--wide) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.dots {
  display: inline-block;
  flex: none;
  width: 0.6em;
  height: 0.7em;
  fill: currentColor;
  overflow: visible;
}

.skip {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 10;
  padding: 5px 10px;
  background: var(--ink);
  color: var(--lcd);
  transform: translateY(-200%);
}
.skip:focus { transform: none; }

/* ── masthead ────────────────────────────────────────────────────────── */

.masthead { border-bottom: 2px solid var(--ink); }

.masthead__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 70px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 15px;
  text-decoration: none;
  text-transform: uppercase;
  white-space: nowrap;
}

/* The toolbar icon: four descending bars — a feed, sorted — in a frame. */
.brand__mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 2px solid currentColor;
}
.brand__mark svg { width: 17.5px; height: 17.5px; fill: currentColor; }

.nav ul {
  display: flex;
  align-items: center;
  gap: 5px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 15px;
  text-transform: uppercase;
}

.nav a {
  display: block;
  padding: 5px 10px;
  text-decoration: none;
  white-space: nowrap;
}

.nav__section { display: none; }

.nav__out {
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--shadow);
}

@media (min-width: 960px) {
  .nav__section { display: block; }
}

/* ── hero ────────────────────────────────────────────────────────────── */

.hero {
  padding-block: 30px 10px;
  background-image: radial-gradient(ellipse 70% 60% at 65% 30%, var(--glow), transparent 70%);
}

.hero__status {
  margin: 0 0 20px;
  color: var(--dim);
  font-size: 15px;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0 0 30px;
  font-size: 40px;
  line-height: 1.25;
  max-width: 19em;
}

.hero h1 mark {
  padding: 0 0.1em;
  background: var(--ink);
  color: var(--lcd);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 50px;
}

.hero__lead { max-width: 30em; }

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px 30px;
  margin: 35px 0 20px;
}

.hero__note {
  max-width: 30em;
  margin: 0;
  color: var(--dim);
  font-size: 15px;
}

@media (min-width: 700px) {
  .hero { padding-top: 45px; }
  .hero h1 { margin-bottom: 40px; font-size: 50px; line-height: 1.2; }
}

@media (min-width: 1000px) {
  .hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

@media (min-width: 1200px) {
  .hero h1 { font-size: 60px; }
}

/* ── buttons ─────────────────────────────────────────────────────────── */

.button {
  display: inline-block;
  padding: 15px 20px 13px;
  border: 2px solid var(--ink);
  background: transparent;
  color: var(--ink);
  box-shadow: 4px 4px 0 var(--shadow);
  font: inherit;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
}
.button:hover { background: var(--ink); color: var(--lcd); }
.button:active { transform: translate(4px, 4px); box-shadow: none; }

.button--primary { background: var(--ink); color: var(--lcd); }
.button--primary:hover { background: var(--dim); border-color: var(--dim); }

/* ── screenshot ──────────────────────────────────────────────────────── */

.shot { margin: 0; }

.shot__frame {
  border: 2px solid var(--ink);
  background: var(--ghost);
  box-shadow: 8px 8px 0 var(--shadow);
  aspect-ratio: 1280 / 800;
}

.shot picture,
.shot img {
  display: block;
  width: 100%;
  height: auto;
}

.shot figcaption {
  margin-top: 20px;
  color: var(--dim);
  font-size: 15px;
}

/* ── sections ────────────────────────────────────────────────────────── */

.section { padding-block: 70px; }

@media (min-width: 700px) {
  .section { padding-block: 100px; }
}

.section__head {
  margin: 0 0 40px;
  padding-bottom: 10px;
  border-bottom: 2px dotted var(--dim);
}

.section__head h2 {
  margin: 0;
  font-size: 30px;
  line-height: 1.2;
}

.section__intro {
  max-width: 36em;
  margin-bottom: 50px;
}

.section h3 {
  margin: 0 0 10px;
  font-size: 20px;
  line-height: 1.3;
}

/* ── how it works ────────────────────────────────────────────────────── */

.steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 60px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.step {
  display: grid;
  gap: 25px;
  align-content: start;
}

.step__num {
  display: inline-grid;
  place-items: center;
  width: 50px;
  height: 50px;
  margin-bottom: 20px;
  background: var(--ink);
  color: var(--lcd);
  font-size: 30px;
}

.step p:last-child { margin-bottom: 0; }

@media (min-width: 700px) {
  .step { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 40px; }
}

/* Three across: the replicas share one row, bottom-aligned, so the three
   step numbers and headings line up whatever height each replica is. */
@media (min-width: 1080px) {
  .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    grid-template-rows: auto auto;
    gap: 40px;
  }
  .step {
    grid-row: span 2;
    grid-template-columns: none;
    grid-template-rows: subgrid;
    gap: 40px;
  }
  .step__demo { order: -1; }
}

/*
 * Replicas of the extension's own popup and banner. They are drawn in HTML
 * rather than screenshots so they follow the light/dark theme like the real
 * thing does. Their text is the extension's real text; keep it that way.
 */
.demo {
  align-self: start;
  max-width: 360px;
  border: 2px solid var(--ink);
  background-color: var(--lcd);
  background-image: radial-gradient(var(--ghost) 0.75px, transparent 1px);
  background-size: 3px 3px;
  box-shadow: 4px 4px 0 var(--shadow);
  font-size: 15px;
  line-height: 1.3;
}

@media (min-width: 1080px) {
  .step__demo { align-self: end; }
}

.demo__row {
  display: flex;
  align-items: baseline;
  padding: 12px 15px 10px;
}
.demo__row + .demo__row { border-top: 2px dotted var(--dim); }

.demo__dim { color: var(--dim); }
.demo__caps { text-transform: uppercase; }

.demo__head {
  padding: 12px 15px 10px;
  border-bottom: 2px solid var(--ink);
}

.demo__body {
  display: grid;
  gap: 6px;
  padding: 12px 15px 15px;
}

.demo__label { color: var(--dim); text-transform: uppercase; }
.demo__label ~ .demo__label { margin-top: 8px; }

.demo__select {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px 5px;
  border: 2px solid var(--ink);
}

.demo__go {
  margin-top: 12px;
  padding: 9px 10px 8px;
  background: var(--ink);
  color: var(--lcd);
  box-shadow: 3px 3px 0 var(--shadow);
  text-align: center;
  text-transform: uppercase;
}

.demo--banner {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 14px 15px;
}

.demo__grow { flex: 1; min-width: 0; }

.demo__track {
  height: 14px;
  margin-top: 10px;
  padding: 2px;
  border: 2px solid var(--ink);
}

/* A segmented bar, lit one block at a time like the banner's meter. */
.demo__fill {
  width: 45%;
  height: 100%;
  background: repeating-linear-gradient(90deg, var(--ink) 0 6px, transparent 6px 8px);
}

.demo__stop {
  flex: none;
  padding: 6px 12px 5px;
  background: var(--ink);
  color: var(--lcd);
  text-transform: uppercase;
}

/* ── outlier chart ───────────────────────────────────────────────────── */

.chart {
  margin: 0 0 60px;
  padding: 20px 15px 15px;
  border: 2px solid var(--ink);
  background: var(--lcd);
  box-shadow: 8px 8px 0 var(--shadow);
  view-timeline: --chart block;
}

@media (min-width: 700px) {
  .chart { padding: 30px 30px 25px; }
}

.chart__plot {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  column-gap: 10px;
  margin-top: 35px;
}

/* On a phone the median's axis label would take a fifth of the width; the
   legend says the same thing, so the plot gets the room instead. */
.chart__axis { display: none; }

@media (min-width: 700px) {
  .chart__plot { grid-template-columns: auto minmax(0, 1fr); }
  .chart__axis { display: block; }
}

.chart__axis {
  position: relative;
  width: 4em;
  color: var(--dim);
  font-size: 15px;
  line-height: 1.2;
}

/* Sits level with the median line: 24 of the plot's 32 rows down. */
.chart__axis span {
  position: absolute;
  top: 75%;
  right: 0;
  transform: translateY(-50%);
  text-align: right;
  text-transform: uppercase;
  white-space: nowrap;
}

.chart__canvas { position: relative; }

.chart__canvas svg {
  display: block;
  width: 100%;
  height: auto;
}

/* Tags are placed in the SVG's own units: left = (x + 1) / 88, top = y / 32. */
.chart__tag {
  position: absolute;
  padding: 2px 5px 1px;
  font-size: 15px;
  line-height: 1.2;
  white-space: nowrap;
  transform: translate(-50%, calc(-100% - 5px));
}

.chart__tag--hot { background: var(--ink); color: var(--lcd); }
.chart__tag--off { color: var(--dim); text-transform: uppercase; }
.chart__tag--pin { left: 15.91%; top: 31.25%; }
.chart__tag--hot { left: 50%; top: 15.625%; }
.chart__tag--new { right: 0; top: 0; transform: translateY(-100%); padding-right: 0; }

.chart__time {
  display: flex;
  justify-content: space-between;
  grid-column: -2;
  margin-top: 10px;
  color: var(--dim);
  font-size: 15px;
  text-transform: uppercase;
}

.px--unlit { fill: var(--unlit); }
.px--lit { fill: var(--ink); }
.px--off { fill: none; stroke: var(--dim); stroke-width: 0.14; }

/* A gap cut through the bars, then a dashed line in it: readable over lit
   and unlit pixels alike. */
.chart__rule-gap { stroke: var(--lcd); stroke-width: 0.5; }
.chart__rule { stroke: var(--ink); stroke-width: 0.22; stroke-dasharray: 0.6 0.4; }
.chart__cutoff { stroke: var(--dim); stroke-width: 0.22; stroke-dasharray: 0.6 0.4; }

.chart figcaption {
  color: var(--dim);
  font-size: 15px;
}

.legend {
  display: grid;
  gap: 10px 30px;
  margin: 25px 0 0;
  padding: 20px 0 0;
  border-top: 2px dotted var(--dim);
  list-style: none;
  font-size: 15px;
}

.legend li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.legend__key {
  flex: none;
  width: 16px;
  height: 16px;
  align-self: center;
}
.legend__key--rule { width: 24px; height: 18px; }

.legend__chip {
  flex: none;
  padding: 1px 5px 0;
  background: var(--ink);
  color: var(--lcd);
}

@media (min-width: 1000px) {
  .legend { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media screen and (prefers-reduced-motion: no-preference) {
  @supports (animation-timeline: view()) {
    /* The counted bars light up row by row as the chart scrolls in, the way
       the banner's meter fills. Scrolling back reverses it. */
    .chart__lit {
      animation: chart-fill steps(27, end) both;
      animation-timeline: --chart;
      animation-range: entry 10% entry 90%;
    }
  }
}

@keyframes chart-fill {
  from { clip-path: inset(100% 0 0 0); }
  to { clip-path: inset(0 0 0 0); }
}

.rules {
  display: grid;
  gap: 25px 50px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.rules li {
  position: relative;
  padding-left: 25px;
}

/* A single lit 2×2 block for a bullet. */
.rules li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  background: var(--ink);
}

@media (min-width: 900px) {
  .rules { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ── spec sheet ──────────────────────────────────────────────────────── */

.spec { margin: 0; }

.spec__row {
  display: grid;
  /* minmax(0, …) everywhere a grid holds a <pre>: a grid item's default
     min-width is its longest unbreakable line, which would widen the page. */
  grid-template-columns: minmax(0, 1fr);
  gap: 5px 40px;
  padding: 20px 0 22px;
  border-bottom: 2px dotted var(--dim);
}

.spec dt {
  color: var(--dim);
  text-transform: uppercase;
}

.spec dd {
  max-width: 38em;
  margin: 0;
}

.spec dd p:last-child { margin-bottom: 0; }

@media (min-width: 800px) {
  .spec__row { grid-template-columns: 250px minmax(0, 1fr); }
}

.keys {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 15px 0 0;
  padding: 0;
  list-style: none;
  font-size: 15px;
}

.keys li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 10px 3px;
  border: 2px solid var(--ink);
}

.sample {
  margin: 15px 0 0;
  padding: 10px 12px 8px;
  border: 2px solid var(--ink);
  font: inherit;
  font-size: 15px;
}

/* ── privacy (inverse video) ─────────────────────────────────────────── */

.band {
  background-color: var(--ink);
  background-image: radial-gradient(var(--ink-ghost) 0.75px, transparent 1px);
  background-size: 3px 3px;
  color: var(--lcd);
}

.band ::selection { background: var(--lcd); color: var(--ink); }
.band a:hover { background: var(--lcd); color: var(--ink); }
.band :focus-visible { outline-color: var(--lcd); }
.band .section__head { border-bottom-color: var(--ink-dim); }
.band em { background: var(--lcd); color: var(--ink); }

.band__claim {
  max-width: 22em;
  margin: 0 0 30px;
  font-size: 30px;
  line-height: 1.3;
}

.band__body { max-width: 36em; }

.proofs {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  margin-top: 50px;
}

@media (min-width: 1000px) {
  .proofs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.proof h3 { color: var(--ink-dim); }

.proof pre {
  margin: 0 0 20px;
  padding: 15px 15px 13px;
  border: 2px solid var(--lcd);
  font: inherit;
  font-size: 15px;
  line-height: 1.4;
}

.proof p:last-child { margin-bottom: 0; }

.band__more { margin: 50px 0 0; }

/* ── free ────────────────────────────────────────────────────────────── */

.free__body { max-width: 36em; }

.compare { margin-top: 70px; }

.compare__note {
  max-width: 44em;
  color: var(--dim);
  font-size: 15px;
}

.table-scroll {
  overflow-x: auto;
  border: 2px solid var(--ink);
  box-shadow: 8px 8px 0 var(--shadow);
  background: var(--lcd);
}

.table-scroll:focus-visible { outline-offset: 6px; }

.table-hint {
  margin: 20px 0 0;
  color: var(--dim);
  font-size: 15px;
}

/* From 768px the table's 700px minimum fits, so there is nothing to scroll. */
@media (min-width: 768px) {
  .table-hint { display: none; }
}

table {
  width: 100%;
  min-width: 700px;
  border-collapse: collapse;
  table-layout: fixed;
  font-size: 15px;
  line-height: 1.4;
}

th, td {
  padding: 12px 15px 10px;
  text-align: left;
  vertical-align: top;
}

thead th {
  background: var(--ink);
  color: var(--lcd);
  font-weight: 400;
  text-transform: uppercase;
}

thead td { width: 21%; }

tbody th {
  color: var(--dim);
  font-weight: 400;
  text-transform: uppercase;
}

tbody tr + tr > * { border-top: 2px dotted var(--dim); }
td + td, th + td { border-left: 2px solid var(--ink); }
thead th + th { border-left: 2px solid var(--lcd); }

/* ── questions ───────────────────────────────────────────────────────── */

.faq details { border-bottom: 2px dotted var(--dim); }

.faq summary {
  display: flex;
  align-items: baseline;
  gap: 15px;
  padding: 20px 0 18px;
  cursor: pointer;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--dim); }

.faq summary .dots { transform: rotate(-90deg); }
.faq details[open] summary .dots { transform: none; }

.faq__answer {
  max-width: 38em;
  padding: 0 0 25px 27px;
}

.faq__answer p:last-child { margin-bottom: 0; }

/* ── closing ─────────────────────────────────────────────────────────── */

.closing {
  padding-block: 20px 100px;
}

.closing__panel {
  display: grid;
  gap: 30px;
  padding: 30px 20px;
  border: 2px solid var(--ink);
  box-shadow: 8px 8px 0 var(--shadow);
}

.closing__panel h2 {
  margin: 0 0 15px;
  font-size: 30px;
  line-height: 1.2;
}

.closing__panel p { max-width: 34em; }
.closing__panel p:last-child { margin-bottom: 0; }

@media (min-width: 900px) {
  .closing__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 40px;
  }
}

.closing__actions {
  display: grid;
  gap: 15px;
  justify-items: start;
}

/* ── footer ──────────────────────────────────────────────────────────── */

.footer {
  padding-block: 30px 40px;
  border-top: 2px solid var(--ink);
  font-size: 15px;
}

.footer__grid {
  display: grid;
  gap: 25px;
}

.footer ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 25px;
  margin: 0;
  padding: 0;
  list-style: none;
}

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

@media (min-width: 900px) {
  .footer__grid {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: baseline;
  }
  .footer ul { justify-content: flex-end; }
  .footer__legal { grid-column: 1 / -1; }
}