/* Knowbel Reader site. Colors follow the app's own palette (src/index.css in
   knowbel-reader): warm paper, near-black ink, and a navy link color. */
:root {
  --bg: #fbfaf7;
  --bg-alt: #f3f1ec;
  --text: #1a1a1a;
  --muted: #5a5853;
  --rule: #e2dfd8;
  --link: #2854a1;
  --link-hover: #1d3f7a;
  --on-link: #ffffff;
  --code-bg: #1e1d1b;
  --code-text: #e4e2dd;
  --code-comment: #a09d96;
  --shadow: 0 1px 2px rgba(26, 26, 26, 0.06), 0 12px 40px rgba(26, 26, 26, 0.14);
  --serif: "Literata", Georgia, "Times New Roman", serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1a1918;
    --bg-alt: #211f1d;
    --text: #e4e2dd;
    --muted: #a09d96;
    --rule: #3a3834;
    --link: #8fb0e8;
    --link-hover: #b3caf0;
    --on-link: #14171c;
    --code-bg: #121110;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 40px rgba(0, 0, 0, 0.45);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #1a1918;
  --bg-alt: #211f1d;
  --text: #e4e2dd;
  --muted: #a09d96;
  --rule: #3a3834;
  --link: #8fb0e8;
  --link-hover: #b3caf0;
  --on-link: #14171c;
  --code-bg: #121110;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 40px rgba(0, 0, 0, 0.45);
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--link);
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
}

a:hover {
  color: var(--link-hover);
}

h1,
h2,
h3 {
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.01em;
}

code,
kbd {
  font-family: var(--mono);
  font-size: 0.88em;
}

kbd {
  padding: 0.05em 0.35em;
  border: 1px solid var(--rule);
  border-bottom-width: 2px;
  border-radius: 4px;
}

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 16px;
}

.wrap.narrow {
  max-width: 720px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--rule);
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 64px;
}

.brand {
  color: var(--text);
  font-weight: 700;
  font-size: 1.2rem;
  text-decoration: none;
}

.brand:hover {
  color: var(--text);
}

.site-header nav {
  display: flex;
  gap: 24px;
}

.site-header nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

.site-header nav a:hover {
  color: var(--text);
}

/* Hero */
.hero {
  padding: 72px 0 56px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--link);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0 auto;
  max-width: 16ch;
  font-size: clamp(2.25rem, 6vw, 3.75rem);
}

.lede {
  margin: 24px auto 0;
  max-width: 36em;
  color: var(--muted);
  font-size: 1.2rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-block;
  padding: 10px 20px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
}

.button:hover {
  border-color: var(--muted);
  color: var(--text);
}

.button.primary {
  border-color: var(--link);
  background: var(--link);
  color: var(--on-link);
}

.button.primary:hover {
  border-color: var(--link-hover);
  background: var(--link-hover);
  color: var(--on-link);
}

.meta {
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

/* Screenshots */
.shot {
  margin: 0;
}

.shot img {
  border: 1px solid var(--rule);
  border-radius: 10px;
  box-shadow: var(--shadow);
}

.hero-shot {
  max-width: 1280px;
  margin: 56px auto 0;
  padding: 0 16px;
}

.hero-shot figcaption {
  max-width: 44em;
  margin: 20px auto 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.hero-shot figcaption strong {
  color: var(--text);
}

/* Feature rows */
.features {
  padding: 48px 0 32px;
}

.feature {
  display: grid;
  grid-template-columns: 5fr 7fr;
  align-items: center;
  gap: 56px;
  padding: 48px 0;
}

.feature.flip {
  grid-template-columns: 7fr 5fr;
}

.feature.flip .feature-text {
  order: 2;
}

.feature h2 {
  margin: 0 0 16px;
  font-size: clamp(1.6rem, 3vw, 2.1rem);
}

.feature p {
  margin: 0 0 14px;
  color: var(--muted);
}

.feature p strong,
.feature p em {
  color: var(--text);
}

/* Reader feature grid */
.reading {
  padding: 72px 0;
  background: var(--bg-alt);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.reading h2,
.start h2 {
  margin: 0;
  font-size: clamp(1.6rem, 3vw, 2.1rem);
}

.section-lede {
  margin: 12px 0 0;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px 40px;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
}

.grid h3 {
  margin: 0 0 6px;
  font-size: 1.1rem;
}

.grid p {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
}

/* Get started */
.start {
  padding: 80px 0;
}

.start p {
  color: var(--muted);
}

.start p code {
  color: var(--text);
}

pre {
  overflow-x: auto;
  margin: 24px 0;
  padding: 20px 24px;
  border-radius: 10px;
  background: var(--code-bg);
  color: var(--code-text);
  font-size: 0.95rem;
  line-height: 1.7;
}

pre .c {
  color: var(--code-comment);
}

/* Footer */
.site-footer {
  padding: 32px 0 48px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-row p {
  margin: 0 0 6px;
}

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

.site-footer a:hover {
  color: var(--text);
}

/* Narrow screens */
@media (max-width: 860px) {
  .feature,
  .feature.flip {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 36px 0;
  }

  .feature.flip .feature-text {
    order: 0;
  }

  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .hero {
    padding: 48px 0 40px;
  }

  .lede {
    font-size: 1.08rem;
  }

  .site-header nav {
    gap: 16px;
  }

  .site-header nav a[href="#features"] {
    display: none;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  pre {
    padding: 16px;
    font-size: 0.85rem;
  }
}