/* ==========================================================================
   BetterQR — design tokens
   Paper-light theme. Accent gradient sampled from the project's own mark.
   ========================================================================== */

:root {
  --paper: #FCFBFA;
  --panel: #F5F1FB;
  --panel-line: #E7E2F3;
  --ink: #14131F;
  --ink-soft: #5B5872;
  --ink-faint: #6A6685;
  --violet: #6D28D9;
  --violet-soft: #F0E9FE;
  --magenta: #DB2777;
  --line: #E7E4EE;
  --code-bg: #14131F;
  --code-line: #2B2A3D;

  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 10px;

  --max-w: 1120px;

  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-color-scheme: dark) {
  /* Site is intentionally light-themed regardless of OS preference. */
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; }

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--violet);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--magenta);
  display: inline-block;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 550;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--ink);
}

h2 {
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1.12;
}

h3 {
  font-size: 19px;
  letter-spacing: -0.01em;
}

p { margin: 0; }

.section-head {
  max-width: 640px;
  margin-bottom: 44px;
}

.section-head h2 { margin-top: 14px; }

.section-head p {
  margin-top: 14px;
  color: var(--ink-soft);
  font-size: 16.5px;
}

section { padding: 96px 0; scroll-margin-top: 90px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15px;
  padding: 13px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), background 0.2s;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}
.btn-primary:hover {
  box-shadow: 0 10px 24px -8px rgba(20, 19, 31, 0.45);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}
.btn-ghost:hover {
  border-color: var(--violet);
  color: var(--violet);
}

/* ---------- Nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(252, 251, 250, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18.5px;
  color: var(--ink);
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 9px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  font-size: 14.5px;
  font-weight: 500;
}

.nav-links a:not(.btn) {
  text-decoration: none;
  color: var(--ink-soft);
  transition: color 0.2s;
}
.nav-links a:not(.btn):hover { color: var(--violet); }

.nav-actions { display: flex; align-items: center; gap: 18px; }

@media (max-width: 720px) {
  .nav-links-text { display: none; }
}

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

.hero {
  padding: 76px 0 40px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
}

.hero h1 {
  font-size: clamp(34px, 5vw, 54px);
  line-height: 1.06;
  margin-top: 18px;
}

.hero h1 em {
  font-style: normal;
  background: linear-gradient(100deg, var(--violet), var(--magenta));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  margin-top: 22px;
  font-size: 17.5px;
  color: var(--ink-soft);
  max-width: 480px;
}

.hero-actions {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.install-box {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--ink);
  color: #F4F2FA;
  font-family: var(--font-mono);
  font-size: 14.5px;
  padding: 13px 10px 13px 20px;
  border-radius: 999px;
}

.install-box .prompt { color: var(--magenta); }
.install-box .pkg { color: #EDE9FE; }

.copy-btn {
  border: none;
  background: rgba(255,255,255,0.08);
  color: #cfc9e6;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
  flex-shrink: 0;
}
.copy-btn:hover { background: rgba(255,255,255,0.18); color: #fff; }
.copy-btn svg { width: 15px; height: 15px; }

.hero-proof {
  margin-top: 18px;
  font-size: 13.5px;
  color: var(--ink-faint);
  font-family: var(--font-mono);
}

/* ---------- Mosaic ---------- */

.mosaic-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  background: var(--panel);
  border: 1px solid var(--panel-line);
  padding: 26px;
  overflow: hidden;
}

.mosaic {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  position: relative;
  z-index: 2;
}

.mosaic-tile {
  aspect-ratio: 1;
  border-radius: 14px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 1px 2px rgba(20,19,31,0.06), 0 8px 20px -12px rgba(20,19,31,0.18);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
  will-change: transform;
}

.mosaic-tile img { width: 100%; height: 100%; object-fit: cover; }

.mosaic-tile:hover {
  transform: translateY(-4px) rotate(-1.5deg) scale(1.04);
  box-shadow: 0 16px 30px -14px rgba(109, 40, 217, 0.35);
  z-index: 3;
}

.mosaic-tile:nth-child(3n) { transform: rotate(0.8deg); }
.mosaic-tile:nth-child(3n+1) { transform: rotate(-0.6deg); }
.mosaic-tile:nth-child(3n):hover,
.mosaic-tile:nth-child(3n+1):hover { transform: translateY(-4px) rotate(-1.5deg) scale(1.04); }

.scan-sweep {
  position: absolute;
  inset: -20% -60% -20% -60%;
  background: linear-gradient(100deg,
    transparent 42%,
    rgba(109, 40, 217, 0.16) 48%,
    rgba(219, 39, 119, 0.22) 50%,
    rgba(109, 40, 217, 0.16) 52%,
    transparent 58%);
  transform: translateX(-100%);
  animation: sweep 5.5s ease-in-out infinite;
  animation-delay: 1.2s;
  pointer-events: none;
  z-index: 1;
}

@keyframes sweep {
  0%, 8% { transform: translateX(-60%); }
  45%, 55% { transform: translateX(60%); }
  100% { transform: translateX(60%); }
}

.mosaic-caption {
  margin-top: 18px;
  font-size: 13px;
  color: var(--ink-faint);
  text-align: center;
  font-family: var(--font-mono);
}

/* ---------- Spec strip ---------- */

.spec-strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 26px 0;
}

.spec-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--ink-soft);
  justify-content: center;
}

.spec-row span {
  padding: 0 22px;
  border-right: 1px solid var(--line);
  white-space: nowrap;
}
.spec-row span:last-child { border-right: none; }

@media (max-width: 720px) {
  .spec-row span { border-right: none; padding: 0 14px; }
}

/* ---------- Feature grid ---------- */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

@media (max-width: 980px) { .feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .feature-grid { grid-template-columns: 1fr; } }

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 0.25s, transform 0.35s var(--ease);
}
.card:hover { border-color: var(--violet); transform: translateY(-3px); }

.card.span-2 { grid-column: span 2; }

@media (max-width: 980px) {
  .card.span-2 { grid-column: span 2; }
}
@media (max-width: 560px) {
  .card.span-2 { grid-column: span 1; }
}

.card-visual {
  border-radius: var(--radius-sm);
  background: var(--panel);
  min-height: 128px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 14px;
}

.card-visual img { max-height: 108px; width: auto; border-radius: 6px; }

.card-visual--tall { min-height: 210px; }
.card-visual--tall img { max-height: 190px; }

.card p.desc {
  color: var(--ink-soft);
  font-size: 14.5px;
}

.shape-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.shape-row img {
  width: 40px;
  height: 40px;
  border-radius: 7px;
  border: 1px solid var(--line);
}

.pair-row {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 18px;
}
.pair-row figure { margin: 0; text-align: center; }
.pair-row img { border-radius: 6px; border: 1px solid var(--line); }
.pair-row figcaption {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  margin-top: 8px;
}

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-family: var(--font-mono);
  font-size: 12.5px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--violet-soft);
  color: var(--violet);
}

.helper-row {
  display: flex;
  gap: 10px;
  justify-content: center;
}
.helper-row img {
  width: 52px;
  height: 52px;
  border-radius: 8px;
  border: 1px solid var(--line);
}

/* ---------- Code section ---------- */

.code-panel {
  background: var(--code-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.code-tabs {
  display: flex;
  gap: 4px;
  padding: 14px 18px 0;
}

.code-tab {
  font-family: var(--font-mono);
  font-size: 13px;
  color: #8a86a3;
  background: transparent;
  border: none;
  padding: 10px 16px;
  border-radius: 8px 8px 0 0;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}
.code-tab.active {
  color: #fff;
  background: var(--code-line);
}

.code-body {
  border-top: 1px solid var(--code-line);
  padding: 24px 26px 28px;
}

.code-block { display: none; }
.code-block.active { display: block; }

.code-block pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13.6px;
  line-height: 1.75;
  color: #E4E1F2;
  overflow-x: auto;
}

.code-block .c-comment { color: #7d7996; }
.code-block .c-str { color: #F7B990; }
.code-block .c-fn { color: #B39CFA; }
.code-block .c-flag { color: #67D6C4; }

/* ---------- Micro QR banner ---------- */

.micro-banner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--panel-line);
  border-radius: var(--radius-lg);
  padding: 48px;
}

@media (max-width: 860px) {
  .micro-banner { grid-template-columns: 1fr; padding: 32px; gap: 32px; }
}

.micro-banner ul {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14.5px;
  color: var(--ink-soft);
}
.micro-banner li { display: flex; gap: 10px; }
.micro-banner li::before { content: "→"; color: var(--violet); font-family: var(--font-mono); }

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

footer {
  border-top: 1px solid var(--line);
  padding: 48px 0;
}

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--ink-faint);
}
.footer-brand img { width: 22px; height: 22px; border-radius: 6px; }

.footer-links {
  display: flex;
  gap: 26px;
  font-size: 14px;
  font-weight: 500;
}
.footer-links a { text-decoration: none; color: var(--ink-soft); transition: color 0.2s; }
.footer-links a:hover { color: var(--violet); }

/* ---------- Reveal on scroll ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.in { opacity: 1; transform: translateY(0); }

/* ---------- Focus states ---------- */

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: 3px;
}