/* ==========================================================================
   Keychar — Chuchen Technology (Xiamen) Co., Ltd
   Pure black & white. Tech-editorial. Geist + Geist Mono.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Surface */
  --bg:           #FFFFFF;
  --bg-soft:      #FAFAFA;
  --bg-card:      #FFFFFF;

  /* Ink — pure neutral scale */
  --ink:          #0A0A0A;
  --ink-soft:     #404040;
  --ink-mute:     #737373;
  --ink-faint:    #A3A3A3;
  --ink-ghost:    #D4D4D4;

  /* Lines */
  --rule:         #E5E5E5;
  --rule-strong:  #D4D4D4;

  /* Type */
  --font-sans:    "Geist", -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  --font-mono:    "Geist Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-zh:      "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

  /* Scale */
  --fs-mono:      0.6875rem;      /* 11px */
  --fs-mono-lg:   0.75rem;        /* 12px */
  --fs-body:      0.9375rem;      /* 15px */
  --fs-body-lg:   1.0625rem;      /* 17px */
  --fs-deck:      1.125rem;       /* 18px */
  --fs-h3:        1.5rem;
  --fs-h2:        clamp(2rem, 4.5vw, 3.5rem);
  --fs-h1:        clamp(4.5rem, 13vw, 11rem);

  /* Spacing rhythm */
  --pad-x: clamp(1.5rem, 5vw, 4.5rem);
  --pad-y-section: clamp(5rem, 11vw, 8rem);

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* --------------------------------------------------------------------------
   Reset
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { background: none; border: 0; padding: 0; cursor: pointer; color: inherit; font: inherit; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

/* --------------------------------------------------------------------------
   Page shell
   -------------------------------------------------------------------------- */
html, body { background: var(--bg); }
body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.55;
  color: var(--ink);
  font-feature-settings: "ss01", "ss03", "ss04", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

main, header, footer { position: relative; z-index: 1; }

.skip-link {
  position: absolute;
  left: -10000px;
  width: 1px; height: 1px;
  overflow: hidden;
}
.skip-link:focus {
  position: fixed;
  left: 1rem; top: 1rem;
  width: auto; height: auto;
  padding: 0.75rem 1rem;
  background: var(--ink);
  color: var(--bg);
  z-index: 100;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

/* --------------------------------------------------------------------------
   Reusable: label (mono section eyebrows)
   -------------------------------------------------------------------------- */
.label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-mono-lg);
  color: var(--ink-mute);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.label__num { color: var(--ink); font-weight: 500; }
.label__divider { color: var(--ink-faint); }
.label--right { color: var(--ink-mute); }

/* --------------------------------------------------------------------------
   Nav
   -------------------------------------------------------------------------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 2rem;
  padding: 1rem var(--pad-x);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  border-bottom: 1px solid var(--rule);
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.9375rem;
  line-height: 1;
  letter-spacing: -0.005em;
}

.nav__brand-mark {
  display: inline-block;
  width: 0.625rem; height: 0.625rem;
  background: var(--ink);
}

.nav__menu {
  display: flex;
  justify-content: center;
  gap: clamp(1rem, 3vw, 2.5rem);
  font-family: var(--font-mono);
  font-size: var(--fs-mono-lg);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.nav__menu a {
  position: relative;
  padding: 0.25rem 0;
  transition: color 0.2s ease;
}
.nav__menu a:hover { color: var(--ink); }
.nav__menu a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-out);
}
.nav__menu a:hover::after { transform: scaleX(1); }

.nav__meta {
  display: flex;
  justify-content: flex-end;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.05em;
  color: var(--ink-mute);
}

.nav__meta-time { display: inline-flex; align-items: baseline; gap: 0.4rem; }
.nav__meta-time-zone { color: var(--ink-faint); }

@media (max-width: 720px) {
  .nav { grid-template-columns: auto 1fr; gap: 1rem; padding: 0.875rem var(--pad-x); }
  .nav__menu { display: none; }
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  padding: 6.5rem var(--pad-x) 3rem;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: clamp(2.5rem, 6vw, 5rem);
  border-bottom: 1px solid var(--rule);
}

.hero__meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  opacity: 0;
  animation: fadeUp 0.8s var(--ease-out) 0.2s both;
}

.hero__body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: 1.5rem;
  max-width: 70rem;
}

.hero__title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: var(--fs-h1);
  line-height: 0.86;
  letter-spacing: -0.05em;
  color: var(--ink);
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 0.45s both;
}

.hero__sub {
  font-family: var(--font-zh);
  font-weight: 400;
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  letter-spacing: 0.4em;
  color: var(--ink-mute);
  padding-left: 0.2em;
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 0.7s both;
}

.hero__lede {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 36ch;
  margin-top: 1.5rem;
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 0.9s both;
}

.hero__lede-cn {
  font-family: var(--font-zh);
  font-weight: 300;
  font-size: var(--fs-body);
  line-height: 1.75;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
  max-width: 32ch;
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 1.05s both;
}

.hero__data {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 1.25s both;
}

@media (max-width: 720px) {
  .hero__data { grid-template-columns: repeat(2, 1fr); }
}

.datum dt {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
  margin-bottom: 0.5rem;
}

.datum dd {
  font-family: var(--font-sans);
  font-size: var(--fs-body-lg);
  line-height: 1.3;
  color: var(--ink);
  margin: 0;
  letter-spacing: -0.005em;
}

.datum__sub {
  font-size: var(--fs-body) !important;
  color: var(--ink-mute) !important;
  margin-top: 0.15rem !important;
}

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */
.section {
  padding: var(--pad-y-section) var(--pad-x);
  border-bottom: 1px solid var(--rule);
}

.section--alt { background: var(--bg-soft); }

.section__header {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: 56rem;
  margin-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.section__title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: var(--fs-h2);
  line-height: 1.05;
  letter-spacing: -0.035em;
  color: var(--ink);
}

.section__deck {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: var(--fs-deck);
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--ink-soft);
  max-width: 40ch;
}

/* --- 02. Studio --- */
.section__body--columns {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(2rem, 5vw, 5rem);
}

@media (max-width: 820px) {
  .section__body--columns { grid-template-columns: 1fr; }
}

.prose p {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: var(--fs-body-lg);
  line-height: 1.65;
  color: var(--ink-soft);
  max-width: 42ch;
}
.prose p strong { color: var(--ink); font-weight: 500; }
.prose p + p { margin-top: 1.25rem; }

.prose__cn {
  font-family: var(--font-zh) !important;
  font-size: var(--fs-body) !important;
  font-weight: 300 !important;
  line-height: 1.85 !important;
  letter-spacing: 0.03em;
  color: var(--ink-mute) !important;
  margin-top: 2rem !important;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  max-width: 36ch;
}

.aside {
  padding: 1.75rem;
  background: var(--bg);
  border: 1px solid var(--rule);
  align-self: start;
}

.aside__list > div + div {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
}

.aside__list dt {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
  margin-bottom: 0.45rem;
}

.aside__list dd {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.5;
  color: var(--ink);
}

.aside__sub {
  font-family: var(--font-zh);
  font-size: 0.8125rem;
  color: var(--ink-mute);
  letter-spacing: 0.03em;
}

/* --- 03. Practice --- */
.practice {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
  border-left: 1px solid var(--rule);
}

@media (max-width: 820px) { .practice { grid-template-columns: 1fr; } }

.practice__item {
  padding: 2.5rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background: var(--bg);
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.practice__num {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-lg);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
  margin-bottom: 0.5rem;
}

.practice__title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: var(--fs-h3);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.practice__zh {
  font-family: var(--font-zh);
  font-weight: 400;
  font-size: 0.8125rem;
  letter-spacing: 0.15em;
  color: var(--ink-mute);
  margin-top: -0.25rem;
}

.practice__body {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--ink-soft);
  margin-top: 0.75rem;
}

/* --- 04. Product (feature card + upcoming) --- */
.feature {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
  gap: 0;
  align-items: stretch;
  border: 1px solid var(--ink);
  background: var(--bg);
}

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

.feature__meta {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem;
  border-right: 1px solid var(--rule);
  background: var(--ink);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: var(--fs-mono-lg);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

@media (max-width: 980px) { .feature__meta { border-right: 0; border-bottom: 1px solid var(--rule); } }

.feature__index { color: color-mix(in srgb, var(--bg) 55%, transparent); }

.feature__status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.feature__status-dot {
  width: 7px; height: 7px;
  background: var(--bg);
  border-radius: 0; /* square — more tech */
  animation: pulse 2.4s ease-in-out infinite;
}

.feature__body { padding: 2rem; }

.feature__title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
  color: var(--ink);
}

.feature__sub {
  margin-top: 0.5rem;
  font-family: var(--font-sans);
  font-size: var(--fs-deck);
  line-height: 1.45;
  color: var(--ink-soft);
}

.feature__copy {
  margin-top: 1.5rem;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--ink-soft);
  max-width: 42ch;
}

.feature__facts {
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: var(--fs-body);
}

.feature__facts li {
  display: flex;
  gap: 1rem;
  align-items: baseline;
}

.feature__facts-label {
  flex: 0 0 6.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
}

.feature__facts a {
  border-bottom: 1px solid var(--ink);
  transition: opacity 0.2s;
}
.feature__facts a:hover { opacity: 0.6; }

.feature__cta {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  border-left: 1px solid var(--rule);
  background: var(--bg-soft);
}

@media (max-width: 980px) { .feature__cta { border-left: 0; border-top: 1px solid var(--rule); padding: 1.5rem; } }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  background: var(--ink);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: var(--fs-mono-lg);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}
.btn:hover { background: var(--bg); color: var(--ink); outline: 1px solid var(--ink); outline-offset: -1px; }

.upcoming {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
}

.upcoming__title {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-lg);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
  font-weight: 500;
  margin-bottom: 1.25rem;
}

.upcoming__list li {
  display: grid;
  grid-template-columns: 5rem 1fr auto;
  gap: 1rem;
  align-items: baseline;
  padding: 1rem 0;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-sans);
  font-size: var(--fs-body-lg);
}

.upcoming__list li:last-child { border-bottom: 0; }

.upcoming__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-lg);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
}

.upcoming__name { color: var(--ink); }

.upcoming__status {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--rule-strong);
}

@media (max-width: 600px) {
  .upcoming__list li { grid-template-columns: 1fr; gap: 0.25rem; }
  .upcoming__status { justify-self: start; }
}

/* --- 05. Contact --- */
.contact {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
}

@media (max-width: 820px) { .contact { grid-template-columns: 1fr; gap: 2.5rem; } }

.contact__group-title {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-mute);
  margin: 0 0 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--rule);
  font-weight: 500;
}

.contact__list li {
  display: flex;
  gap: 1rem;
  padding: 0.6rem 0;
  font-size: var(--fs-body);
  align-items: baseline;
}

.contact__list li + li { border-top: 1px solid var(--rule); }

.contact__label {
  flex: 0 0 4.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-mono-lg);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
}

.contact__list a {
  font-family: var(--font-sans);
  color: var(--ink);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.contact__list a:hover { border-bottom-color: var(--ink); }

.contact__email {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.contact__email a {
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  transition: opacity 0.2s;
}
.contact__email a:hover { opacity: 0.6; }

.contact__email-note {
  margin-top: 1rem;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.55;
  color: var(--ink-mute);
  max-width: 32ch;
}

.contact__address {
  font-style: normal;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact__address-zh {
  font-family: var(--font-zh);
  color: var(--ink-mute);
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  padding: clamp(3rem, 6vw, 4.5rem) var(--pad-x) 2rem;
  background: var(--ink);
  color: var(--bg);
  border-top: 1px solid var(--ink);
}

.footer__primary {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid color-mix(in srgb, var(--bg) 15%, transparent);
}

@media (max-width: 820px) { .footer__primary { grid-template-columns: 1fr; gap: 2rem; } }

.footer__brand-mark {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 1.875rem;
  letter-spacing: -0.03em;
  color: var(--bg);
  margin-bottom: 0.5rem;
}

.footer__brand-line {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: color-mix(in srgb, var(--bg) 70%, transparent);
  line-height: 1.5;
}
.footer__brand-line strong {
  font-weight: 500;
  color: var(--bg);
}

.footer__brand-line-zh {
  font-family: var(--font-zh);
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  color: color-mix(in srgb, var(--bg) 55%, transparent);
  margin-top: 0.25rem;
}

.footer__nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  justify-self: end;
}

@media (max-width: 820px) { .footer__nav { justify-self: start; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; } }
@media (max-width: 480px) { .footer__nav { grid-template-columns: 1fr 1fr; } }

.footer__nav-title {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--bg) 45%, transparent);
  margin-bottom: 0.85rem;
  font-weight: 500;
}

.footer__nav ul {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  color: color-mix(in srgb, var(--bg) 80%, transparent);
}

.footer__nav a { transition: color 0.2s; }
.footer__nav a:hover { color: var(--bg); }

.footer__legal-list {
  padding-top: 2.5rem;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem 2.5rem;
}

@media (max-width: 720px) { .footer__legal-list { grid-template-columns: 1fr; } }

.footer__legal-list dt {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--bg) 45%, transparent);
  margin-bottom: 0.4rem;
}

.footer__legal-list dd {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  line-height: 1.5;
  color: color-mix(in srgb, var(--bg) 92%, transparent);
}

.footer__legal-zh {
  font-family: var(--font-zh);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--bg) 60%, transparent);
}

.hint {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  color: color-mix(in srgb, var(--bg) 40%, transparent);
  margin-left: 0.4rem;
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid color-mix(in srgb, var(--bg) 12%, transparent);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--bg) 50%, transparent);
}

/* --------------------------------------------------------------------------
   Document pages (privacy / terms)
   -------------------------------------------------------------------------- */
.doc {
  max-width: 44rem;
  margin: 0 auto;
  padding: 8rem var(--pad-x) 6rem;
}

.doc__header { margin-bottom: 3rem; }

.doc__title {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: clamp(2.5rem, 5.5vw, 3.5rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin: 1rem 0;
}

.doc__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
}

.doc h2 {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 1.375rem;
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 3rem 0 1rem;
  color: var(--ink);
}

.doc h3 {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 1.0625rem;
  margin: 2rem 0 0.75rem;
  color: var(--ink);
}

.doc p, .doc li {
  font-family: var(--font-sans);
  font-size: var(--fs-body-lg);
  line-height: 1.7;
  color: var(--ink-soft);
}

.doc p + p { margin-top: 1rem; }
.doc ul, .doc ol { padding-left: 1.5rem; margin: 1rem 0; list-style: disc; }
.doc ol { list-style: decimal; }
.doc li + li { margin-top: 0.5rem; }

.doc a { color: var(--ink); border-bottom: 1px solid var(--ink); }
.doc a:hover { opacity: 0.6; }

.doc__back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
  transition: color 0.2s;
}

.doc__back:hover { color: var(--ink); }

/* --------------------------------------------------------------------------
   Animations
   -------------------------------------------------------------------------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translate3d(0, 14px, 0); }
  to   { opacity: 1; transform: translate3d(0, 0, 0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.35; transform: scale(0.85); }
}

.reveal {
  opacity: 0;
  transform: translate3d(0, 20px, 0);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}