:root {
  color-scheme: dark;
  --bg: #09090b;
  --surface: #18181b;
  --raised: #27272a;
  --line: #3f3f46;
  --text: #fafafa;
  --soft: #e4e4e7;
  --muted: #a1a1aa;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
}
a {
  color: inherit;
  text-decoration: none;
}
.shell {
  width: min(1120px, calc(100% - 40px));
  margin-inline: auto;
}
.nav {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 18px;
  font-weight: 650;
  letter-spacing: -0.04em;
}
.brand-mark {
  width: 26px;
  height: 26px;
  display: inline-grid;
  place-items: center;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: -0.08em;
  border-radius: 6px;
}
nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: var(--soft);
  font-size: 14px;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  background: var(--text);
  color: var(--bg);
  border: 1px solid var(--text);
  border-radius: 9px;
  font-weight: 700;
  font-size: 14px;
  transition:
    background 0.16s ease,
    color 0.16s ease;
}
.button:hover {
  background: #d4d4d8;
  border-color: #d4d4d8;
}
.button-small {
  min-height: 36px;
  padding: 0 13px;
}
.button-quiet {
  color: var(--text);
  background: transparent;
  border-color: var(--line);
}
.button-quiet:hover {
  background: var(--raised);
  border-color: #71717a;
}
.hero {
  min-height: 690px;
  display: grid;
  grid-template-columns: 1fr 0.92fr;
  gap: 70px;
  align-items: center;
  padding: 86px 0;
}
.eyebrow {
  margin: 0 0 18px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font:
    600 11px ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
}
h1,
h2,
h3,
p {
  margin-top: 0;
}
h1 {
  margin-bottom: 0;
  font-size: clamp(40px, 5vw, 64px);
  line-height: 0.96;
  letter-spacing: -0.05em;
}
h1 span {
  color: var(--muted);
  font-weight: 450;
}
.lede {
  max-width: 600px;
  margin: 28px 0 0;
  color: var(--soft);
  font-size: 19px;
  line-height: 1.6;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 34px;
}
.release-note {
  display: flex;
  gap: 9px;
  margin: 15px 0 0;
  color: var(--muted);
  font-size: 12px;
}
.product-frame {
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.24);
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}
.frame-bar {
  height: 48px;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 14px;
  border-bottom: 1px solid var(--line);
  color: var(--soft);
  font-size: 13px;
  font-weight: 600;
}
.frame-bar .brand-mark {
  width: 21px;
  height: 21px;
  font-size: 11px;
  border-radius: 5px;
}
.frame-status {
  margin-left: auto;
  color: var(--muted);
  font-size: 11px;
  font-weight: 500;
}
.preview {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 185px;
  background: #111113;
  border-bottom: 1px solid var(--line);
  color: #71717a;
  font:
    600 10px ui-monospace,
    monospace;
  letter-spacing: 0.14em;
}
.preview button {
  position: absolute;
  width: 52px;
  height: 34px;
  bottom: 18px;
  right: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  background: var(--raised);
  font: 600 11px inherit;
}
.timeline {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 45px;
  padding: 0 16px;
  border-bottom: 1px solid var(--line);
}
.timeline span,
.timeline i,
.timeline b {
  display: block;
  height: 8px;
  border-radius: 2px;
}
.timeline span {
  flex: 1;
  background: #3f3f46;
}
.timeline i {
  flex: 2;
  background: #71717a;
}
.timeline b {
  width: 3px;
  height: 21px;
  background: var(--text);
}
.conversation {
  display: grid;
  gap: 12px;
  padding: 16px;
  flex: 1;
  overflow-y: auto;
  min-height: 0;
}
.message {
  margin: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 13px;
  line-height: 1.5;
}
.message-user {
  margin-left: 32px;
  background: var(--raised);
  color: var(--text);
}
.message-agent {
  margin-right: 12px;
  background: #111113;
}
.message-agent strong {
  display: block;
  color: var(--soft);
  font-size: 11px;
}
.message-agent p {
  margin: 5px 0 0;
  color: var(--soft);
}
.proposal {
  display: grid;
  gap: 3px;
  margin-top: 11px;
  padding: 10px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.proposal span,
.proposal small {
  color: var(--muted);
  font-size: 11px;
}
.proposal b {
  font-size: 12px;
}
.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-block: 1px solid var(--line);
}
.principles p {
  margin: 0;
  padding: 20px 0;
  color: var(--soft);
  text-align: center;
  font-size: 13px;
}
.principles p + p {
  border-left: 1px solid var(--line);
}
.workflow {
  padding: 132px 0;
}
.section-intro {
  max-width: 550px;
}
.section-intro h2,
.closing h2 {
  margin-bottom: 0;
  font-size: clamp(40px, 5vw, 62px);
  line-height: 1;
  letter-spacing: -0.065em;
}
.workflow ol {
  display: grid;
  grid-template-columns: 1fr;
  margin: 65px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.workflow li {
  padding: 26px 0;
}
.workflow li + li {
  padding-left: 0;
  border-left: 0;
  border-top: 1px solid var(--line);
}
.workflow li span {
  color: var(--muted);
  font:
    600 11px ui-monospace,
    monospace;
}
.workflow h3 {
  margin: 22px 0 11px;
  font-size: 19px;
  letter-spacing: -0.035em;
}
.workflow li p {
  color: var(--muted);
  line-height: 1.6;
  font-size: 14px;
}
.closing {
  padding: 92px 0;
  border-top: 1px solid var(--line);
}
.closing h2 {
  margin: 0 0 31px;
}
.closing .eyebrow {
  margin-bottom: 16px;
}
.split-main {
  display: grid;
  grid-template-columns: 1fr 0.92fr;
  gap: 70px;
}
.hero {
  min-height: 690px;
  display: flex;
  align-items: center;
  padding: 86px 0;
}
.sidebar {
  position: relative;
}
.sidebar-inner {
  position: absolute;
  top: 86px;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  flex-direction: column;
}
footer {
  min-height: 140px;
  display: flex;
  align-items: center;
  gap: 26px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}
footer p {
  margin: 0 auto 0 0;
  font-size: 14px;
}
footer div {
  display: flex;
  gap: 20px;
  font-size: 13px;
}
@media (max-width: 800px) {
  .split-main {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .sidebar {
    position: static;
  }
  .sidebar-inner {
    position: static;
  }
  .hero {
    min-height: auto;
    padding: 64px 0 72px;
  }
  .hero-copy {
    text-align: center;
  }
  .lede {
    margin-inline: auto;
  }
  .actions,
  .release-note {
    justify-content: center;
  }
  .product-frame {
    max-width: 560px;
    width: 100%;
    margin-inline: auto;
  }
  .workflow {
    padding: 90px 0;
  }
}
@media (max-width: 560px) {
  .shell {
    width: min(100% - 28px, 1120px);
  }
  .nav {
    min-height: 66px;
  }
  .nav nav a:not(.button) {
    display: none;
  }
  .button-small {
    min-height: 34px;
  }
  .principles {
    grid-template-columns: 1fr;
  }
  .principles p + p {
    border-left: 0;
    border-top: 1px solid var(--line);
  }
  .principles p {
    padding: 14px 0;
  }
  .release-note {
    flex-wrap: wrap;
  }
  .workflow {
    padding: 72px 0;
  }
  footer {
    min-height: 0;
    padding: 30px 0;
    align-items: flex-start;
    flex-wrap: wrap;
  }
  footer p {
    width: 100%;
    order: 3;
  }
}

.proposal-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 8px;
}
.proposal-wrapper .proposal {
  flex: 1;
  margin-top: 0;
}
.undo-icon {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 18px;
  cursor: pointer;
  padding: 4px;
  transition: color 0.2s;
  flex-shrink: 0;
}
.undo-icon:hover {
  color: var(--text);
}