/* ===== Design tokens ===== */
:root {
  /* Palette — light */
  --bg: #fbfbfd;
  --surface: #ffffff;
  --surface-2: #f5f4fc;
  --text: #15151f;
  --muted: #6c6c82;
  --border: #eae9f2;
  --accent: #2f6bed;
  --accent-2: #7c5cff;
  --grad: linear-gradient(118deg, #2f6bed, #7c5cff);
  --hero: radial-gradient(120% 90% at 80% 0%, #efeaff 0%, #fbfbfd 55%);

  /* Elevation */
  --shadow: 0 1px 2px rgba(20, 20, 40, .05), 0 14px 44px rgba(40, 40, 90, .07);
  --shadow-lg: 0 2px 6px rgba(20, 20, 40, .06), 0 36px 80px rgba(40, 40, 90, .16);
  --shadow-cta: 0 24px 60px rgba(80, 70, 200, .28);

  /* Radii */
  --r-sm: 7px;
  --r-md: 11px;
  --r-lg: 18px;
  --r-xl: 26px;

  /* Layout */
  --max-w: 1100px;
  --gutter: 28px;

  /* Type */
  --font: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Motion */
  --ease: cubic-bezier(.2, .7, .2, 1);
  --dur-fast: .2s;
  --dur-med: .8s;
  --dur-slow: .95s;
}

[data-theme="dark"] {
  --bg: #0b0b13;
  --surface: #13131f;
  --surface-2: #181826;
  --text: #f2f2f9;
  --muted: #9696ad;
  --border: #24243a;
  --accent: #7aa2ff;
  --accent-2: #a78bfa;
  --grad: linear-gradient(118deg, #7aa2ff, #a78bfa);
  --hero: radial-gradient(120% 90% at 80% 0%, #1b1838 0%, #0b0b13 58%);
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 16px 50px rgba(0, 0, 0, .4);
  --shadow-lg: 0 2px 6px rgba(0, 0, 0, .35), 0 40px 90px rgba(0, 0, 0, .6);
  --shadow-cta: 0 24px 60px rgba(50, 30, 140, .55);
}

/* ===== Base ===== */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
::selection { background: rgba(124, 92, 255, .2); }
code { font-family: var(--mono); font-size: 13px; background: var(--surface-2); padding: 1px 5px; border-radius: 4px; }

/* ===== Reveal-on-scroll (CSS-driven; JS only toggles .is-visible) ===== */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--dur-med) var(--ease), transform var(--dur-med) var(--ease);
}
.reveal.delay-1 { transition-delay: .05s; }
.reveal.delay-2 { transition-delay: .1s; }
.reveal.lg {
  transform: translateY(16px);
  transition-duration: var(--dur-slow);
}
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .word-rotate { transition: none; }
  html { scroll-behavior: auto; }
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}
.site-header__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 7px;
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -.02em;
}
.logo__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--grad);
  display: inline-block;
}
.nav { display: flex; align-items: center; gap: 4px; }
.nav__link {
  padding: 8px 12px;
  font-size: 14.5px;
  color: var(--muted);
  border-radius: 8px;
  transition: color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.nav__link:hover { color: var(--text); background: var(--surface-2); }
.nav__link[aria-current="page"] { color: var(--text); font-weight: 500; }
.nav__link svg { opacity: .7; }

.theme-toggle {
  margin-left: 6px;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 9px;
  cursor: pointer;
  color: var(--text);
  transition: background var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.theme-toggle:hover { background: var(--surface-2); }
.theme-toggle:active { transform: scale(.94); }
.theme-toggle .icon-dark { display: none; }
[data-theme="dark"] .theme-toggle .icon-light { display: none; }
[data-theme="dark"] .theme-toggle .icon-dark { display: block; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 22px;
  border-radius: var(--r-md);
  font-size: 15px;
  font-weight: 500;
  transition: transform var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease);
  cursor: pointer;
  border: none;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); opacity: .9; }
.btn-primary { background: var(--text); color: var(--bg); }
.btn-secondary {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-secondary:hover { background: var(--surface-2); transform: translateY(-2px); }

.btn-store {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  padding: 13px 22px;
  border-radius: 13px;
  transition: transform var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease);
}
.btn-store:hover { transform: translateY(-2px); }
.btn-store:active { transform: translateY(0); opacity: .92; }
.btn-store__sub { display: block; font-size: 10.5px; font-weight: 400; opacity: .8; }
.btn-store__main { display: block; font-size: 17px; font-weight: 600; letter-spacing: -.01em; }
.btn-store--dark { background: var(--text); color: var(--bg); }
.btn-store--light { background: #fff; color: #15151f; }

/* ===== Layout helpers ===== */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* ===== Cards ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 28px;
  box-shadow: var(--shadow);
}
.card__icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--surface-2);
  display: grid;
  place-items: center;
  margin-bottom: 16px;
}
.card__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -.01em;
}
.card__body {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ===== Image-slot placeholder ===== */
.slot {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--accent) 10%, var(--surface-2)) 0%, var(--surface-2) 100%);
  color: var(--muted);
  font-size: 13px;
  letter-spacing: .02em;
  text-align: center;
  padding: 24px;
  overflow: hidden;
}
.slot::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(color-mix(in srgb, var(--accent-2) 18%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--accent-2) 18%, transparent) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: .35;
  pointer-events: none;
  animation: slot-drift 18s linear infinite;
}
.slot__label {
  position: relative;
  z-index: 1;
  background: color-mix(in srgb, var(--surface) 86%, transparent);
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 999px;
  font-weight: 500;
}
@keyframes slot-drift {
  from { background-position: 0 0, 0 0; }
  to   { background-position: 28px 28px, 28px 28px; }
}

/* ===== Window mockup ===== */
.window {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.window__bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}
.window__dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.window__dot--red { background: #ff5f57; }
.window__dot--yel { background: #febc2e; }
.window__dot--grn { background: #28c840; }
.window__title {
  margin-left: 10px;
  font-size: 12.5px;
  color: var(--muted);
  font-weight: 500;
}
.window__body {
  aspect-ratio: 16/10;
  position: relative;
  background: var(--surface-2);
}

/* Generic ratio-locked frame */
.frame {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  background: var(--surface-2);
  position: relative;
}
.frame--lg { box-shadow: var(--shadow-lg); border-radius: 20px; }
.frame--16x9 { aspect-ratio: 16/9; }
.frame--16x10 { aspect-ratio: 16/10; }
.frame--4x3 { aspect-ratio: 4/3; }

/* ===== Footer ===== */
.site-footer {
  margin-top: 72px;
  border-top: 1px solid var(--border);
}
.site-footer__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px;
}
.site-footer__brand {
  display: flex;
  align-items: center;
  gap: 7px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -.02em;
  color: var(--muted);
}
.site-footer__brand .logo__dot { width: 8px; height: 8px; }
.site-footer__links { display: flex; gap: 22px; font-size: 14px; color: var(--muted); }
.site-footer__links a { transition: color var(--dur-fast) var(--ease); }
.site-footer__links a:hover { color: var(--text); }
.site-footer__copy { font-size: 13.5px; color: var(--muted); }

/* ===== Typography helpers ===== */
.eyebrow {
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--accent-2);
}
.eyebrow--small {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--muted);
}
.gradient-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Rotating headline word ("serious work" <-> "serious fun") */
.word-rotate {
  display: inline-block;
  transform-origin: 50% 100%;
  transition: transform .4s cubic-bezier(.4, 0, .2, 1), opacity .4s cubic-bezier(.4, 0, .2, 1);
}
.word-rotate.is-flipping {
  transform: rotateX(90deg);
  opacity: 0;
}

/* ===== Responsive ===== */
@media (max-width: 760px) {
  .nav__link:not(.theme-toggle) { padding: 6px 9px; font-size: 13.5px; }
  .site-header__inner { padding: 0 18px; }
  .site-footer__inner { padding: 32px 18px; }
}

/* ===== Footer spacing modifiers ===== */
.site-footer--blog,
.site-footer--prose { margin-top: 64px; }
.site-footer--flush { margin-top: 0; }

/* ===== Home (index) ===== */
.hero {
  background: var(--hero);
  border-bottom: 1px solid var(--border);
}
.hero__grid {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 104px var(--gutter) 96px;
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 56px;
  align-items: center;
}
.hero__title {
  margin: 0;
  font-size: clamp(40px, 5.4vw, 66px);
  line-height: 1.03;
  letter-spacing: -.035em;
  font-weight: 600;
}
.hero__lede {
  margin: 26px 0 0;
  font-size: clamp(17px, 2vw, 19px);
  line-height: 1.58;
  color: var(--muted);
  max-width: 460px;
}
.hero__ctas {
  margin-top: 34px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.features {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 80px var(--gutter) 24px;
}
.features__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 30px;
}
.features__head h2 { margin: 0; }
.features__link {
  font-size: 14px;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.ethos {
  max-width: 760px;
  margin: 0 auto;
  padding: 80px var(--gutter) 24px;
  text-align: center;
}
.ethos__text {
  margin: 0;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.4;
  letter-spacing: -.015em;
  font-weight: 500;
}
@media (max-width: 860px) {
  .hero__grid { grid-template-columns: 1fr; padding: 72px var(--gutter) 64px; gap: 36px; }
  .features__grid { grid-template-columns: 1fr; }
  .features { padding-top: 56px; }
}

/* ===== Product page (yaAnnotator) ===== */
.product-hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 96px var(--gutter) 44px;
  text-align: center;
}
.product-icon {
  width: 88px;
  height: 88px;
  border-radius: 21px;
  background: var(--grad);
  display: grid;
  place-items: center;
  margin: 0 auto 26px;
  box-shadow: 0 10px 30px rgba(124, 92, 255, .34);
  animation: float-y 6s ease-in-out infinite;
}
@keyframes float-y {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}
.product-hero h1 {
  margin: 0 auto;
  font-size: clamp(38px, 6vw, 64px);
  line-height: 1.04;
  letter-spacing: -.035em;
  font-weight: 600;
  max-width: 780px;
}
.product-hero__lede {
  margin: 26px auto 0;
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.55;
  color: var(--muted);
  max-width: 600px;
}
.product-hero__cta {
  margin-top: 34px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 13px;
}
.meta-line { font-size: 13px; color: var(--muted); }
.shot-wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 24px var(--gutter);
}
.feat-intro {
  max-width: 1000px;
  margin: 0 auto;
  padding: 64px var(--gutter) 24px;
  text-align: center;
}
.feat-intro h2 {
  margin: 0 auto;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.1;
  letter-spacing: -.025em;
  font-weight: 600;
  max-width: 560px;
}
.feat-row {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px var(--gutter);
}
.feat-row__grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 52px;
  align-items: center;
}
.feat-row--reverse .feat-row__grid {
  grid-template-columns: 1.15fr 1fr;
}
.feat-row__kicker {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 12px;
}
.feat-row__title {
  margin: 0 0 14px;
  font-size: clamp(24px, 3.2vw, 32px);
  line-height: 1.12;
  letter-spacing: -.02em;
  font-weight: 600;
}
.feat-row__body {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.62;
  color: var(--muted);
}
.checklist {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.checklist li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14.5px;
  color: var(--text);
}
.checklist li::before {
  content: "✦";
  color: var(--accent-2);
  margin-top: 1px;
}
.strip {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 48px var(--gutter);
}
.strip__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 34px 32px;
  box-shadow: var(--shadow);
}
.panel h3 {
  margin: 0 0 12px;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -.015em;
}
.panel p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--muted);
}
.chip-row { display: flex; gap: 7px; flex-wrap: wrap; }
.chip {
  font-size: 12.5px;
  padding: 5px 11px;
  border-radius: 7px;
  background: var(--surface-2);
  color: var(--muted);
}
.cta {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 56px var(--gutter) 96px;
}
.cta__inner {
  background: var(--grad);
  border-radius: var(--r-xl);
  padding: 64px 40px;
  text-align: center;
  box-shadow: var(--shadow-cta);
  position: relative;
  overflow: hidden;
}
.cta__inner::before {
  content: "";
  position: absolute;
  inset: -40%;
  background:
    radial-gradient(circle at 30% 20%, rgba(255,255,255,.16), transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(255,255,255,.10), transparent 50%);
  pointer-events: none;
  animation: cta-pulse 9s ease-in-out infinite alternate;
}
@keyframes cta-pulse {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(2%, -2%) scale(1.05); }
}
.cta h2 {
  margin: 0 auto 14px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.08;
  letter-spacing: -.025em;
  font-weight: 600;
  color: #fff;
  max-width: 560px;
  position: relative;
}
.cta p {
  margin: 0 auto 30px;
  font-size: 17px;
  line-height: 1.5;
  color: rgba(255, 255, 255, .86);
  max-width: 460px;
  position: relative;
}
.cta .btn-store { position: relative; }
@media (prefers-reduced-motion: reduce) {
  .product-icon { animation: none; }
  .cta__inner::before { animation: none; }
}
@media (max-width: 860px) {
  .feat-row__grid,
  .feat-row--reverse .feat-row__grid,
  .strip__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .feat-row--reverse .feat-row__grid > .frame { order: -1; }
  .product-hero { padding: 64px var(--gutter) 32px; }
  .cta__inner { padding: 48px 28px; }
}

/* ===== Blog ===== */
.blog-main {
  max-width: 720px;
  margin: 0 auto;
  padding: 96px var(--gutter) 0;
}
.blog-head { margin-bottom: 24px; }
.blog-head__title {
  margin: 0;
  font-size: clamp(38px, 6vw, 58px);
  line-height: 1.04;
  letter-spacing: -.035em;
  font-weight: 600;
}
.blog-head__lede {
  margin: 18px 0 0;
  font-size: 18px;
  line-height: 1.55;
  color: var(--muted);
}
.post {
  padding: 48px 0;
  border-top: 1px solid var(--border);
}
.post__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13.5px;
  color: var(--muted);
  margin-bottom: 16px;
}
.post__meta .dot { opacity: .5; }
.post__title {
  margin: 0 0 18px;
  font-size: clamp(26px, 3.6vw, 34px);
  line-height: 1.15;
  letter-spacing: -.025em;
  font-weight: 600;
}
.post__body {
  font-size: 17px;
  line-height: 1.72;
  color: var(--text);
}
.post__body p { margin: 0 0 18px; }
.post__body p:last-child { margin: 0; }
.post__body a { color: var(--accent); }
.post__body a:hover { text-decoration: underline; }
.post__body h3 {
  margin: 28px 0 12px;
  font-size: 20px;
  letter-spacing: -.015em;
  font-weight: 600;
}
.post__body ul, .post__body ol { margin: 0 0 18px; padding-left: 22px; }
.post__body li { margin: 0 0 8px; }
.post__body blockquote {
  margin: 0 0 18px;
  padding-left: 18px;
  border-left: 2px solid var(--border);
  color: var(--muted);
}
.post__body code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .92em;
  background: var(--border);
  padding: .1em .35em;
  border-radius: 4px;
}
.blog-outro {
  padding: 40px 0 8px;
  border-top: 1px solid var(--border);
  text-align: center;
}
.blog-outro p {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
}
.blog-outro a { color: var(--accent); }
.blog-outro a:hover { text-decoration: underline; }

/* ===== Prose (privacy, acknowledgements, and future text pages) ===== */
.prose-main {
  max-width: 720px;
  margin: 0 auto;
  padding: 96px var(--gutter) 0;
}
.prose-head { margin-bottom: 8px; }
.prose-head__title {
  margin: 0;
  font-size: clamp(38px, 6vw, 58px);
  line-height: 1.04;
  letter-spacing: -.035em;
  font-weight: 600;
}
.prose-head__lede {
  margin: 18px 0 0;
  font-size: 18px;
  line-height: 1.55;
  color: var(--muted);
}
.prose {
  padding: 40px 0 8px;
  font-size: 17px;
  line-height: 1.72;
  color: var(--text);
}
.prose h2 {
  margin: 44px 0 14px;
  font-size: clamp(22px, 3vw, 27px);
  line-height: 1.2;
  letter-spacing: -.02em;
  font-weight: 600;
}
.prose h2:first-child { margin-top: 0; }
.prose h3 {
  margin: 24px 0 10px;
  font-size: 18px;
  letter-spacing: -.015em;
  font-weight: 600;
}
.prose p { margin: 0 0 18px; }
.prose a { color: var(--accent); }
.prose a:hover { text-decoration: underline; }
.prose ul {
  margin: 0 0 18px;
  padding-left: 22px;
}
.prose li { margin: 0 0 10px; }