/* The landing page at caotang.app. Same palette and type as the app (apps/desktop/src/styles.css), no web fonts. */

:root {
  color-scheme: light dark;
  --paper: #faf9f6;
  --panel: #f2f0eb;
  --raised: #ffffff;
  --ink: #1f1e1b;
  --ink-soft: #4d4a44;
  --muted: #6b665f;
  --line: #e2ded5;
  --accent: #2c5d8f;
  --accent-ink: #ffffff;
  --accent-soft: #e4edf6;
  --shadow: 0 1px 2px rgba(31, 30, 27, 0.06), 0 8px 24px rgba(31, 30, 27, 0.06);
  --radius: 10px;
  --ui: ui-sans-serif, system-ui, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --manuscript: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #161513;
    --panel: #1d1c19;
    --raised: #23221e;
    --ink: #ebe8e1;
    --ink-soft: #c9c5bc;
    --muted: #a8a398;
    --line: #2f2d28;
    --accent: #8fb6de;
    --accent-ink: #10202f;
    --accent-soft: #22324a;
    --shadow: none;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--ui);
  font-size: 17px;
  line-height: 1.6;
}

a {
  color: var(--accent);
  text-underline-offset: 2px;
}

code,
pre {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.88em;
}

code {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0 4px;
}

pre {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  overflow-x: auto;
  margin: 0 0 12px;
}

pre code {
  background: none;
  border: 0;
  padding: 0;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.narrow {
  max-width: 760px;
}

.skip {
  position: absolute;
  left: -9999px;
}

.skip:focus {
  left: 12px;
  top: 12px;
  background: var(--raised);
  padding: 8px 12px;
  border-radius: 6px;
  z-index: 10;
}

/* Header */

.top {
  position: sticky;
  top: 0;
  z-index: 5;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--manuscript);
  font-size: 1.3rem;
  font-weight: 600;
}

nav {
  display: flex;
  gap: 22px;
  font-size: 0.92rem;
}

nav a {
  color: var(--ink-soft);
  text-decoration: none;
}

nav a:hover {
  color: var(--accent);
}

@media (max-width: 820px) {
  nav a:not(:last-child) {
    display: none;
  }
}

/* Hero */

.hero {
  padding: 88px 0 72px;
}

.eyebrow {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 14px;
}

h1,
h2,
h3 {
  font-family: var(--manuscript);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  max-width: 18ch;
  margin: 0 0 20px;
}

h2 {
  font-size: clamp(1.7rem, 3.2vw, 2.3rem);
  margin: 0 0 10px;
}

h3 {
  font-size: 1.2rem;
  margin: 0 0 6px;
}

.lede {
  font-size: 1.2rem;
  color: var(--ink-soft);
  max-width: 60ch;
  margin: 0 0 28px;
}

.section-lede {
  color: var(--ink-soft);
  font-size: 1.08rem;
  max-width: 62ch;
  margin: 0 0 32px;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 8px 0 14px;
}

.button {
  display: inline-block;
  padding: 11px 20px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--raised);
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.fine {
  color: var(--muted);
  font-size: 0.9rem;
}

.manuscript {
  margin: 48px 0 0;
  background: var(--raised);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 28px 30px;
}

.flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.flow li {
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.flow span {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.flow strong {
  display: block;
  color: var(--ink);
  font-family: var(--manuscript);
  font-size: 1.1rem;
}

@media (max-width: 760px) {
  .flow {
    grid-template-columns: 1fr 1fr;
  }
}

/* Sections */

section {
  padding: 80px 0;
}

section[id] {
  scroll-margin-top: 64px;
}

.band {
  background: var(--panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.grid article,
.card {
  background: var(--raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}

.grid p,
.card p {
  margin: 0;
  color: var(--ink-soft);
}

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

@media (max-width: 600px) {
  .grid {
    grid-template-columns: 1fr;
  }
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-top: 44px;
}

.split p {
  color: var(--ink-soft);
}

@media (max-width: 760px) {
  .split {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

.storage {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--ink-soft);
}

.card li + li {
  margin-top: 6px;
}

.card.accent {
  background: var(--accent-soft);
  border-color: transparent;
}

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

.note {
  margin: 28px 0 0;
  color: var(--muted);
  max-width: 72ch;
}

.steps {
  list-style: none;
  counter-reset: step;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.steps li {
  counter-increment: step;
  background: var(--raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}

.steps li::before {
  content: counter(step);
  display: block;
  font-family: var(--manuscript);
  font-size: 2rem;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 10px;
}

.steps p {
  margin: 0;
  color: var(--ink-soft);
}

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

@media (max-width: 600px) {
  .steps {
    grid-template-columns: 1fr;
  }
}

footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 0.9rem;
}

.foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
}

footer a {
  color: var(--muted);
}