:root {
  color-scheme: light;
  --ink: #152326;
  --muted: #536467;
  --line: rgba(21, 35, 38, 0.14);
  --paper: #f7f2e9;
  --panel: #fffdf8;
  --teal: #2a777c;
  --teal-deep: #1d565a;
  --teal-soft: #dcefed;
  --coral: #b55446;
  --coral-soft: #f2d9d3;
  --gold: #c78c22;
  --gold-soft: #f2e6c9;
  --blue: #496a9a;
  --blue-soft: #dde6f4;
  --shadow: 0 18px 44px rgba(21, 35, 38, 0.12);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
}

a {
  color: inherit;
}

code {
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(21, 35, 38, 0.08);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.topbar {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  height: 70px;
  padding: 10px max(18px, calc((100vw - 1180px) / 2));
  border-bottom: 1px solid rgba(255, 255, 255, 0.28);
  background: rgba(247, 242, 233, 0.82);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  color: var(--ink);
  font-weight: 900;
  text-decoration: none;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 8px;
}

.nav-links {
  display: flex;
  min-width: 0;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav-links::-webkit-scrollbar {
  display: none;
}

.nav-links a,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 253, 248, 0.82);
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.nav-links a[aria-current="page"] {
  border-color: var(--teal);
  background: var(--teal-soft);
  color: var(--teal-deep);
}

.button.primary {
  border-color: var(--teal);
  background: var(--teal);
  color: #fff;
}

.button.secondary {
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
}

.button.ghost {
  background: rgba(255, 255, 255, 0.55);
}

.hero {
  min-height: 78vh;
  display: grid;
  align-items: end;
  padding: 108px max(18px, calc((100vw - 1180px) / 2)) 46px;
  background:
    linear-gradient(90deg, rgba(247, 242, 233, 0.98) 0%, rgba(247, 242, 233, 0.9) 42%, rgba(247, 242, 233, 0.48) 100%),
    url("./product/chatnav-android-phone-current.png") right center / auto 104% no-repeat,
    var(--paper);
}

.hero-inner {
  width: min(780px, 100%);
}

.kicker {
  margin: 0 0 12px;
  color: var(--coral);
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  max-width: 760px;
  font-size: 4.3rem;
  line-height: 0.97;
}

h2 {
  font-size: 2.45rem;
  line-height: 1.06;
}

.hero-copy,
.section-head p,
.split-band p,
.download-panel p,
.footer span {
  color: var(--muted);
  line-height: 1.6;
}

.hero-copy {
  max-width: 680px;
  margin: 22px 0 0;
  font-size: 1.12rem;
}

.hero-actions,
.inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.start-main {
  display: grid;
  min-height: calc(100svh - 104px);
  padding: 94px max(18px, calc((100vw - 1180px) / 2)) 24px;
  background:
    radial-gradient(circle at 12% 82%, rgba(42, 119, 124, 0.12), transparent 32%),
    radial-gradient(circle at 90% 14%, rgba(181, 84, 70, 0.1), transparent 28%),
    var(--paper);
}

.start-shell {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(520px, 1.2fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  width: min(1180px, 100%);
  margin: auto;
}

.start-copy h1,
.hub-hero h1 {
  font-size: clamp(2.75rem, 5vw, 4.6rem);
  line-height: 0.98;
}

.start-copy > p:not(.kicker, .start-status),
.hub-hero > div > p:not(.kicker) {
  max-width: 680px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.6;
}

.start-status {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.start-directory {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 253, 248, 0.82);
  box-shadow: var(--shadow);
}

.directory-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: end;
  margin-bottom: 14px;
}

.directory-head h2 {
  font-size: clamp(1.7rem, 3vw, 2.25rem);
}

.directory-head > p {
  max-width: 245px;
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

.hub-directory {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.hub-door {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-content: start;
  min-height: 185px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--panel);
}

.hub-door:nth-child(2) {
  background: #f8fbff;
}

.hub-door:nth-child(3) {
  background: #fff9eb;
}

.hub-door:nth-child(4) {
  background: #eef7f5;
}

.door-number {
  display: grid;
  place-items: center;
  width: 31px;
  height: 31px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 900;
}

.hub-door h3 {
  margin: 2px 0 0;
  font-size: 1.05rem;
  line-height: 1.25;
}

.hub-door h3 a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.hub-door p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

.hub-door nav {
  display: flex;
  grid-column: 1 / -1;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.hub-door nav a,
.hub-callout nav a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--teal-deep);
  font-size: 0.82rem;
  font-weight: 850;
  text-decoration: none;
}

.hub-door nav a {
  padding-right: 4px;
  padding-left: 4px;
  font-size: 0.76rem;
}

.compact-footer {
  padding-top: 16px;
  padding-bottom: 16px;
}

.hub-main {
  padding-top: 70px;
}

.hub-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(300px, 0.68fr);
  gap: clamp(28px, 6vw, 76px);
  align-items: center;
  padding: 76px max(18px, calc((100vw - 1180px) / 2)) 58px;
  background:
    radial-gradient(circle at 84% 22%, rgba(42, 119, 124, 0.16), transparent 32%),
    linear-gradient(135deg, var(--paper), #f8f5ee);
}

.breadcrumbs {
  display: flex;
  gap: 8px;
  margin-bottom: 28px;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 800;
}

.breadcrumbs a {
  color: var(--teal-deep);
}

.hub-callout {
  display: grid;
  gap: 12px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 253, 248, 0.88);
  box-shadow: var(--shadow);
}

.hub-callout > strong {
  font-size: 1.25rem;
}

.hub-callout p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.hub-callout nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hash-line {
  display: grid;
  gap: 6px;
}

.hash-line code {
  overflow-wrap: anywhere;
}

.release-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  max-width: 860px;
  margin: 34px 0 0;
}

.release-strip div {
  min-height: 92px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 253, 248, 0.78);
}

.release-strip dt {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 900;
  text-transform: uppercase;
}

.release-strip dd {
  margin: 8px 0 0;
  font-weight: 900;
  overflow-wrap: anywhere;
}

.section {
  padding: 62px max(18px, calc((100vw - 1180px) / 2));
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(0, 1fr);
  gap: 28px;
  align-items: end;
  margin-bottom: 22px;
}

.section-head.compact {
  display: block;
}

.section-head p {
  margin: 0;
  max-width: 680px;
}

.product-band {
  background: #fffdf8;
}

.platform-grid,
.feature-grid,
.lab-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.feature-grid,
.lab-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.platform-card,
.feature-grid article,
.lab-tile,
.ai-board div {
  display: grid;
  gap: 10px;
  min-height: 190px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 253, 248, 0.9);
  box-shadow: 0 12px 28px rgba(21, 35, 38, 0.08);
  text-decoration: none;
}

.platform-card p,
.feature-grid p,
.lab-tile span,
.ai-board span,
.timeline p,
.check-list {
  margin: 0;
  color: var(--muted);
  line-height: 1.48;
}

.platform-state {
  width: fit-content;
  min-height: 30px;
  padding: 5px 9px;
  border-radius: 8px;
  background: var(--teal-soft);
  color: var(--teal-deep);
  font-size: 0.76rem;
  font-weight: 900;
  text-transform: uppercase;
}

.platform-state.soon {
  background: var(--gold-soft);
  color: #78510c;
}

.feature-lab {
  background: linear-gradient(180deg, #f7f2e9, #eef5f3);
}

.feature-grid article:nth-child(2n) {
  background: #f8fbff;
}

.feature-grid article:nth-child(3n) {
  background: #fff9eb;
}

.split-band {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1.05fr);
  gap: 24px;
  align-items: center;
  background: var(--ink);
  color: #fff;
}

.split-band .kicker {
  color: #f1c66a;
}

.split-band p {
  color: rgba(255, 255, 255, 0.74);
}

.ai-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.ai-board div {
  min-height: 146px;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.16);
  box-shadow: none;
}

.ai-board span {
  color: rgba(255, 255, 255, 0.72);
}

.android-band {
  background: #fffdf8;
}

.download-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.8fr);
  gap: 24px;
  align-items: stretch;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.check-list {
  display: grid;
  gap: 8px;
  margin: 18px 0 0;
  padding-left: 20px;
}

.download-actions {
  display: grid;
  gap: 12px;
  align-content: start;
}

.download-actions img {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #edf6f5;
}

.app-lab {
  background: #eef5f3;
}

.lab-tile {
  min-height: 150px;
  background: #fffdf8;
}

.next-band {
  background: #fffdf8;
}

.next-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.next-grid article {
  display: grid;
  gap: 10px;
  min-height: 188px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 12px 28px rgba(21, 35, 38, 0.08);
}

.next-grid p,
.audit-link {
  margin: 0;
  color: var(--muted);
  line-height: 1.48;
}

.audit-link {
  margin-top: 16px;
}

.audit-link a {
  color: var(--teal-deep);
  font-weight: 900;
}

.updates {
  background: var(--paper);
}

.timeline {
  display: grid;
  gap: 12px;
  max-width: 920px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.timeline li {
  display: grid;
  grid-template-columns: 145px minmax(0, 1fr);
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 253, 248, 0.9);
}

.timeline time {
  color: var(--teal-deep);
  font-weight: 900;
}

.timeline strong {
  display: block;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 30px max(18px, calc((100vw - 1180px) / 2));
  border-top: 1px solid var(--line);
  background: #fffdf8;
}

.footer div,
.footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.footer a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--teal-deep);
  font-weight: 800;
}

.privacy-main {
  padding-top: 70px;
}

.privacy-intro {
  display: grid;
  gap: 18px;
  background: linear-gradient(135deg, var(--paper), var(--teal-soft));
}

.privacy-intro h1 {
  max-width: 900px;
}

.privacy-intro > p:not(.kicker) {
  max-width: 780px;
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.65;
}

.privacy-updated {
  font-weight: 850;
}

.privacy-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 22px;
}

.privacy-card {
  display: grid;
  gap: 12px;
  align-content: start;
  min-height: 210px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 12px 28px rgba(21, 35, 38, 0.08);
}

.privacy-card p,
.apk-proof p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.privacy-details {
  background: #eef5f3;
}

.apk-proof {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: end;
  background: #fffdf8;
}

.apk-proof > div:first-child {
  display: grid;
  gap: 12px;
}

.hash {
  overflow-wrap: anywhere;
}

@media (max-width: 940px) {
  .hero {
    min-height: 720px;
    background:
      linear-gradient(180deg, rgba(247, 242, 233, 0.98) 0%, rgba(247, 242, 233, 0.78) 55%, rgba(247, 242, 233, 0.5) 100%),
      url("./product/chatnav-android-phone-current.png") center bottom / auto 62% no-repeat,
      var(--paper);
  }

  h1 {
    font-size: 3.05rem;
  }

  h2 {
    font-size: 2rem;
  }

  .section-head,
  .start-shell,
  .hub-hero,
  .split-band,
  .download-panel,
  .apk-proof {
    grid-template-columns: 1fr;
  }

  .start-main {
    min-height: auto;
    padding-top: 104px;
  }

  .start-shell {
    gap: 28px;
  }

  .platform-grid,
  .feature-grid,
  .lab-grid,
  .next-grid,
  .ai-board,
  .privacy-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .topbar {
    position: sticky;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .hero {
    min-height: 760px;
    padding-top: 34px;
  }

  .start-main {
    padding: 28px 14px;
  }

  .start-copy h1,
  .hub-hero h1 {
    font-size: 2.2rem;
  }

  .start-directory {
    padding: 14px;
  }

  .directory-head {
    display: grid;
    gap: 8px;
  }

  .directory-head > p {
    max-width: none;
  }

  .hub-main {
    padding-top: 0;
  }

  .hub-hero {
    padding: 36px 18px 44px;
  }

  .breadcrumbs {
    margin-bottom: 22px;
  }

  .hub-door {
    min-height: 174px;
    padding: 14px;
  }

  h1 {
    font-size: 2.35rem;
  }

  .release-strip,
  .platform-grid,
  .feature-grid,
  .lab-grid,
  .next-grid,
  .ai-board,
  .privacy-grid,
  .timeline li {
    grid-template-columns: 1fr;
  }

  .privacy-main {
    padding-top: 0;
  }

  .footer {
    display: grid;
  }
}

@media (max-width: 360px) {
  .start-directory {
    padding: 10px;
  }

  .hub-directory {
    gap: 8px;
  }

  .hub-door {
    min-height: 148px;
    padding: 10px;
  }

  .hub-door p {
    display: none;
  }

  .hub-door nav {
    gap: 4px;
  }

  .hub-door nav a {
    padding-right: 2px;
    padding-left: 2px;
    font-size: 0.68rem;
  }
}