/*
 * Blyx, sold.
 *
 * The app's palette, given room to breathe: the same navy and cyan, but with
 * the contrast turned up where a marketing page needs to carry across a room
 * rather than sit under someone's thumb.
 */

:root {
  --bg: #04121a;
  --bg-deep: #020a0f;
  --surface: #0d2b38;
  --surface-raised: #123a48;
  --accent: #2bc6e8;
  --accent-dim: #1b7f96;
  --accent-glow: rgba(43, 198, 232, 0.22);
  --text: #eaf6fa;
  --muted: #9db8c3;
  --gold: #e8b34a;
  --border: #17394a;
  --radius: 14px;

  --font: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

  /* One scale, used everywhere, so nothing is sized by feel. */
  --step-6: clamp(2.5rem, 4.6vw, 4.4rem);
  --step-5: clamp(2rem, 3.4vw, 3.2rem);
  --step-4: clamp(1.7rem, 2.6vw, 2.5rem);
  --step-3: 1.35rem;
  --step-2: 1.08rem;
  --step-1: 0.94rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent);
}

.wrap {
  width: min(1180px, 100% - 48px);
  margin-inline: auto;
}

/* Top bar, which thickens once you leave the hero. */
header.bar {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  padding: 16px 0;
  transition: background 0.3s ease, backdrop-filter 0.3s ease, border-color 0.3s ease;
  border-bottom: 1px solid transparent;
}

header.bar.stuck {
  background: rgba(4, 18, 26, 0.82);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
}

header.bar .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.mark {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--text);
}

/* The mark is drawn in the accent; the knockout inside it takes the page's own
   background, so the same file works on a dark header and a light one. */
.mark svg {
  width: 32px;
  height: 32px;
  flex: none;
}

nav.links {
  display: flex;
  gap: 26px;
  font-size: var(--step-1);
}

nav.links a {
  color: var(--muted);
  text-decoration: none;
}

nav.links a:hover {
  color: var(--text);
}

/* Buttons. */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border-radius: 999px;
  font-size: var(--step-1);
  font-weight: 650;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn.solid {
  background: var(--accent);
  color: #04222c;
  box-shadow: 0 8px 30px -10px var(--accent);
}

.btn.solid:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px -12px var(--accent);
}

.btn.ghost {
  border: 1px solid var(--border);
  color: var(--text);
  background: rgba(13, 43, 56, 0.5);
}

.btn.ghost:hover {
  border-color: var(--accent-dim);
}

/* The hero, in layers that move at different speeds. */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero .glow {
  position: absolute;
  z-index: 0;
  width: 130vw;
  height: 130vw;
  max-width: 1500px;
  max-height: 1500px;
  left: 50%;
  top: -40%;
  transform: translateX(-50%);
  background: radial-gradient(circle at 50% 50%, var(--accent-glow), transparent 62%);
  pointer-events: none;
  will-change: transform;
}

.hero .grid-lines {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 74px 74px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 35%, #000 20%, transparent 75%);
  opacity: 0.5;
  will-change: transform;
}

.hero .wrap {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 54px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 15px 7px 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(13, 43, 56, 0.6);
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.02em;
  margin-bottom: 22px;
}

.eyebrow b {
  color: var(--accent);
  font-weight: 650;
}

h1 {
  margin: 0 0 20px;
  font-size: var(--step-6);
  line-height: 0.98;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

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

.hero p.sub {
  margin: 0 0 32px;
  max-width: 46ch;
  color: var(--muted);
  font-size: var(--step-3);
  line-height: 1.5;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.cta-note {
  margin-top: 16px;
  color: var(--muted);
  font-size: 13px;
}

/* The words always win: a screenshot that drifts under a sentence takes the
   sentence with it. */
.hero .copy {
  position: relative;
  z-index: 3;
}

/* The stack of screenshots beside the headline. */
.stack {
  position: relative;
  height: 480px;
}

.stack figure {
  position: absolute;
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 40px 80px -40px rgba(0, 0, 0, 0.9);
  will-change: transform;
}

.stack .shot-main {
  width: 114%;
  top: 40px;
  left: 0;
}

.stack .shot-card {
  width: 46%;
  left: -2%;
  top: 300px;
}

.stack .shot-panel {
  width: 54%;
  right: -12%;
  top: 20px;
}

/* Section furniture. */
section {
  position: relative;
  padding: 96px 0;
  /* The bar is fixed, so an anchor has to stop below it. */
  scroll-margin-top: 84px;
}

.kicker {
  color: var(--accent);
  font-size: 13px;
  font-weight: 650;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin: 0 0 14px;
}

h2 {
  margin: 0 0 18px;
  font-size: var(--step-5);
  line-height: 1.05;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

h3 {
  margin: 0 0 10px;
  font-size: var(--step-4);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.lead {
  color: var(--muted);
  font-size: var(--step-3);
  max-width: 60ch;
}

p {
  margin: 0 0 16px;
  max-width: 62ch;
}

/* The band of real numbers. */
.numbers {
  background: linear-gradient(180deg, transparent, rgba(13, 43, 56, 0.55), transparent);
  border-block: 1px solid var(--border);
}

.numbers .row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
}

.numbers b {
  display: block;
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.numbers span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: var(--step-1);
}

/* Alternating feature blocks. */
.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.feature.flip .copy {
  order: 2;
}

.feature .art {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 50px 90px -50px rgba(0, 0, 0, 0.95);
  will-change: transform;
}

.feature .art.cut {
  border: 0;
  box-shadow: none;
  display: grid;
  place-items: center;
}

.feature .art.cut img {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 40px 70px -40px rgba(0, 0, 0, 0.95);
  width: auto;
  max-width: 100%;
}

ul.ticks {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  max-width: 62ch;
}

ul.ticks li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 12px;
  color: var(--muted);
}

ul.ticks li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--accent);
}

ul.ticks b {
  color: var(--text);
  font-weight: 650;
}

/* The card grid of smaller promises. */
.tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 18px;
  margin-top: 46px;
}

.tile {
  background: linear-gradient(180deg, var(--surface), rgba(13, 43, 56, 0.35));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px 28px;
}

.tile .icon {
  width: 34px;
  height: 34px;
  margin-bottom: 16px;
  color: var(--accent);
}

.tile h4 {
  margin: 0 0 8px;
  font-size: var(--step-2);
}

.tile p {
  margin: 0;
  color: var(--muted);
  font-size: var(--step-1);
}

/* The price comparison, which is the wishlist's whole argument. */
.compare {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 30px;
  max-width: 620px;
}

.compare div {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  background: var(--surface);
}

.compare .then {
  opacity: 0.72;
}

.compare small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.compare strong {
  font-size: 26px;
  letter-spacing: -0.02em;
}

.compare .then strong {
  color: var(--muted);
}

.compare .now strong {
  color: var(--gold);
}

/* Steps. */
.steps {
  counter-reset: step;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 46px;
}

.steps div {
  border-top: 2px solid var(--accent-dim);
  padding-top: 20px;
}

.steps div::before {
  counter-increment: step;
  content: '0' counter(step);
  display: block;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}

.steps h4 {
  margin: 0 0 8px;
  font-size: var(--step-2);
}

.steps p {
  margin: 0;
  color: var(--muted);
  font-size: var(--step-1);
}

/* Questions. */
.faq {
  margin-top: 40px;
  border-top: 1px solid var(--border);
  max-width: 860px;
}

.faq details {
  border-bottom: 1px solid var(--border);
}

.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 22px 40px 22px 0;
  font-size: var(--step-2);
  font-weight: 650;
  position: relative;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: '+';
  position: absolute;
  right: 6px;
  top: 20px;
  color: var(--accent);
  font-size: 24px;
  font-weight: 400;
  transition: transform 0.2s ease;
}

.faq details[open] summary::after {
  transform: rotate(45deg);
}

.faq p {
  margin: 0 0 22px;
  color: var(--muted);
}

/* The closing call, on its own ground. */
.close-band {
  position: relative;
  text-align: center;
  padding: 130px 0 140px;
  overflow: hidden;
  background: var(--bg-deep);
  border-top: 1px solid var(--border);
}

.close-band .glow {
  position: absolute;
  width: 120vw;
  height: 700px;
  left: 50%;
  bottom: -420px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at 50% 50%, var(--accent-glow), transparent 65%);
  pointer-events: none;
  will-change: transform;
}

.close-band .wrap {
  position: relative;
  z-index: 1;
}

.close-band h2 {
  margin-inline: auto;
  max-width: 18ch;
}

.close-band p {
  margin-inline: auto;
  color: var(--muted);
  font-size: var(--step-3);
}

.close-band .cta-row {
  justify-content: center;
  margin-top: 30px;
}

footer.site {
  padding: 46px 0 60px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
  background: var(--bg-deep);
}

footer.site .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: space-between;
}

footer.site p {
  max-width: 60ch;
  margin: 0;
}

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

/* Motion: everything arrives from slightly below, once. */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.in {
  opacity: 1;
  transform: none;
}

.reveal.d1 {
  transition-delay: 0.08s;
}

.reveal.d2 {
  transition-delay: 0.16s;
}

.reveal.d3 {
  transition-delay: 0.24s;
}

@media (max-width: 980px) {
  .hero .wrap,
  .feature {
    grid-template-columns: 1fr;
  }

  .feature.flip .copy {
    order: 0;
  }

  .stack {
    height: 340px;
  }

  .stack .shot-card,
  .stack .shot-panel {
    display: none;
  }

  .stack .shot-main {
    width: 100%;
    left: 0;
    top: 0;
  }

  .numbers .row,
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  nav.links {
    display: none;
  }
}

/* Nobody is made seasick by a website that sells a library tracker. */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .parallax {
    transform: none !important;
  }
}

/* A quieter line under a claim, for the caveat that makes the claim honest. */
.note {
  margin-top: 14px;
  color: var(--muted);
  font-size: var(--step-1);
  line-height: 1.6;
}

/* A phone screenshot beside a section about phones: tall, so it is capped by
   height rather than width, and centred so the tiles below it stay the anchor. */
.shot-wide {
  margin: 0 0 34px;
  text-align: center;
}

.shot-wide img {
  max-height: 620px;
  width: auto;
  max-width: 100%;
  border-radius: 18px;
  border: 1px solid var(--border);
  box-shadow: 0 24px 60px rgb(0 0 0 / 0.45);
}

/* The four builds, each with its platform's mark. A row rather than a grid of
   cards: they are four versions of one thing, not four products. */
.platforms {
  display: grid;
  gap: 14px;
  margin-top: 34px;
}

.platform {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 22px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
}

.platform-mark {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgb(43 198 232 / 0.12);
  color: var(--accent);
}

.platform-mark svg {
  width: 24px;
  height: 24px;
}

.platform h4 {
  margin: 0 0 4px;
  font-size: var(--step-2);
}

.platform p {
  margin: 0 0 8px;
  color: var(--muted);
}

.platform code {
  font-size: 13px;
  color: var(--accent);
  background: rgb(43 198 232 / 0.08);
  padding: 3px 8px;
  border-radius: 6px;
}

@media (min-width: 760px) {
  .platforms {
    grid-template-columns: 1fr 1fr;
  }
}

/* Under the download button: what it runs on, said once and small. The marks
   are the same ones the platforms section uses, lifted from it so the two can
   never disagree. */
.compatible {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: var(--step-1);
}

.compatible a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.compatible a:hover {
  border-bottom-color: var(--accent);
}

.compatible-mark {
  display: inline-flex;
  color: var(--accent);
}

.compatible-mark svg {
  width: 17px;
  height: 17px;
}

/*
 * Short screens: everything that answers "what is this and can I run it" has to
 * be visible without scrolling.
 *
 * Measured on a 1440x760 window: the buttons ended at 704 and the line under
 * them at 803, against 673 of viewport — so a laptop saw a headline, half a
 * paragraph, and no download button at all. The hero gives back its padding
 * first, then the headline shrinks; the words themselves stay.
 */
@media (max-height: 900px) {
  .hero {
    padding: 84px 0 44px;
  }

  .hero h1 {
    font-size: clamp(2.1rem, 3.4vw, 3.1rem);
    margin-bottom: 14px;
  }

  .hero .sub {
    margin-bottom: 18px;
  }

  .cta-row {
    margin-top: 4px;
  }

  .compatible {
    margin-top: 12px;
  }

  .cta-note {
    margin-top: 10px;
  }
}

/* Shorter still — a 1280x700 laptop window has 613 points to work with, and the
   note landed six over. Another notch off the padding and the headline. */
@media (max-height: 720px) {
  .hero {
    padding: 72px 0 32px;
  }

  .hero h1 {
    font-size: clamp(1.9rem, 3vw, 2.6rem);
  }

  .hero .sub {
    font-size: var(--step-2);
    margin-bottom: 14px;
  }
}

/* The last notch, for a window barely taller than a phone turned sideways. */
@media (max-height: 640px) {
  .hero {
    padding: 60px 0 24px;
  }

  .hero h1 {
    font-size: 1.7rem;
    margin-bottom: 10px;
  }

  .hero .sub {
    font-size: var(--step-1);
    line-height: 1.5;
    margin-bottom: 12px;
  }

  .compatible,
  .cta-note {
    margin-top: 8px;
  }
}

/* Legal pages: one column of text, nothing else. The rest of the site sells
   the app; these two answer questions, so they get the plainest treatment on
   the site — the same colours and the same measure, no glow, no parallax. */
.page {
  padding: 120px 0 80px;
}

.prose {
  max-width: 720px;
}

.prose h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin: 0 0 8px;
}

.prose .lead {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0 0 36px;
}

.prose h2 {
  font-size: 1.15rem;
  margin: 40px 0 12px;
  color: var(--accent);
}

.prose p,
.prose li {
  color: var(--text);
  line-height: 1.7;
  margin: 0 0 14px;
}

.prose ul {
  margin: 0 0 20px;
  padding-left: 20px;
}

.prose li {
  margin: 0 0 8px;
}

.prose code {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1px 6px;
  font-size: 0.9em;
}

.prose a {
  color: var(--accent);
}


/*
 * The consent bar.
 *
 * Along the bottom rather than across the middle: it is a question, not an
 * obstacle, and a page you cannot read until you answer teaches people to click
 * whatever makes it go away. Both answers are the same size and weight, because
 * a "no" styled as an afterthought is not really being offered.
 */
.consent {
  position: fixed;
  inset: auto 0 0 0;
  z-index: 50;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px 22px;
  padding: 14px 20px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  box-shadow: 0 -8px 28px rgb(0 0 0 / 35%);
}

.consent p {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.45;
  color: var(--muted);
}

.consent-buttons {
  display: flex;
  gap: 10px;
}

.consent button {
  padding: 8px 16px;
  font: inherit;
  font-size: 14px;
  color: var(--text);
  cursor: pointer;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.consent button[data-answer='yes'] {
  color: var(--bg);
  background: var(--accent);
  border-color: var(--accent);
}