/* ==========================================================================
   sqlite-msgpack documentation site
   Design system — hand-crafted, no framework, no external CDN.
   ========================================================================== */

/* ----- Design tokens ----------------------------------------------------- */
:root {
  --c-bg:            #ffffff;
  --c-bg-soft:       #f6f8fa;
  --c-bg-mute:       #eef1f4;
  --c-surface:       #ffffff;
  --c-border:        #d8dee4;
  --c-border-soft:   #e9edf1;
  --c-text:          #1f2328;
  --c-text-soft:     #57606a;
  --c-text-mute:     #8b949e;

  --c-primary:       #0b6bcb;
  --c-primary-strong:#0a5bad;
  --c-primary-soft:  #e7f1fc;
  --c-accent:        #d6336c;   /* msgpack-red, used in byte viz / JSON side */
  --c-accent-soft:   #fce8f0;
  --c-green:         #1a7f37;
  --c-amber:         #9a6700;

  --c-code-bg:       #f6f8fa;
  --c-code-border:   #e4e8ec;

  /* syntax colors (light) */
  --syn-keyword:  #cf222e;
  --syn-string:   #0a3069;
  --syn-number:   #0550ae;
  --syn-comment:  #6e7781;
  --syn-func:     #8250df;
  --syn-builtin:  #0a5bad;
  --syn-punct:    #57606a;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
               Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
               "Liberation Mono", monospace;

  --radius:    10px;
  --radius-sm: 7px;
  --shadow-sm: 0 1px 2px rgba(31, 35, 40, 0.06);
  --shadow:    0 4px 16px rgba(31, 35, 40, 0.09);
  --shadow-lg: 0 12px 40px rgba(31, 35, 40, 0.14);

  --nav-h: 60px;
  --max-w: 1180px;
  --content-w: 860px;
}

:root[data-theme="dark"] {
  --c-bg:            #0d1117;
  --c-bg-soft:       #161b22;
  --c-bg-mute:       #1c2128;
  --c-surface:       #161b22;
  --c-border:        #30363d;
  --c-border-soft:   #21262d;
  --c-text:          #e6edf3;
  --c-text-soft:     #9da7b1;
  --c-text-mute:     #6e7681;

  --c-primary:       #4493f8;
  --c-primary-strong:#58a6ff;
  --c-primary-soft:  #11243e;
  --c-accent:        #f778ba;
  --c-accent-soft:   #2d1320;
  --c-green:         #3fb950;
  --c-amber:         #d29922;

  --c-code-bg:       #161b22;
  --c-code-border:   #30363d;

  --syn-keyword:  #ff7b72;
  --syn-string:   #a5d6ff;
  --syn-number:   #79c0ff;
  --syn-comment:  #8b949e;
  --syn-func:     #d2a8ff;
  --syn-builtin:  #79c0ff;
  --syn-punct:    #9da7b1;

  --shadow-sm: 0 1px 2px rgba(1, 4, 9, 0.5);
  --shadow:    0 4px 16px rgba(1, 4, 9, 0.6);
  --shadow-lg: 0 12px 40px rgba(1, 4, 9, 0.7);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; color: var(--c-text); }
h2 { font-size: 1.7rem; margin-top: 2.4em; margin-bottom: 0.7em; }
h3 { font-size: 1.25rem; margin-top: 1.9em; margin-bottom: 0.5em; }
h4 { font-size: 1.02rem; margin-top: 1.5em; margin-bottom: 0.4em; }

p { margin: 0 0 1em; }

hr {
  border: none;
  border-top: 1px solid var(--c-border-soft);
  margin: 2.5rem 0;
}

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

.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.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;
}

/* ----- Buttons ----------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.5em;
  font-weight: 600; font-size: 0.95rem;
  padding: 0.65em 1.3em;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .08s ease, background .15s ease, border-color .15s ease;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-strong); color: #fff; }
.btn-secondary {
  background: var(--c-surface); color: var(--c-text);
  border-color: var(--c-border);
}
.btn-secondary:hover { background: var(--c-bg-soft); }
.btn-ghost { background: transparent; color: var(--c-text); }
.btn-ghost:hover { background: var(--c-bg-mute); }

/* ----- Navbar ------------------------------------------------------------ */
.navbar {
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-h);
  background: color-mix(in srgb, var(--c-bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--c-border-soft);
}
.navbar__inner {
  height: 100%;
  display: flex; align-items: center; gap: 18px;
  max-width: var(--max-w); margin: 0 auto; padding: 0 24px;
}
.navbar__brand {
  display: flex; align-items: center; gap: 9px;
  font-weight: 700; font-size: 1.06rem; color: var(--c-text);
}
.navbar__brand:hover { text-decoration: none; }
.navbar__brand .logo { width: 26px; height: 26px; flex: none; }
.navbar__brand b { color: var(--c-primary); }
.navbar__links {
  display: flex; align-items: center; gap: 4px;
  margin-left: auto;
}
.navbar__links a {
  color: var(--c-text-soft); font-weight: 500; font-size: 0.94rem;
  padding: 0.45em 0.7em; border-radius: var(--radius-sm);
}
.navbar__links a:hover { color: var(--c-text); background: var(--c-bg-mute); text-decoration: none; }
.navbar__links a.active { color: var(--c-primary); }
.navbar__sep { width: 1px; height: 22px; background: var(--c-border); margin: 0 4px; }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; padding: 0;
  border: 1px solid var(--c-border); border-radius: var(--radius-sm);
  background: var(--c-surface); color: var(--c-text-soft); cursor: pointer;
  transition: background .15s ease, color .15s ease;
}
.icon-btn:hover { background: var(--c-bg-mute); color: var(--c-text); }
.icon-btn svg { width: 18px; height: 18px; }
.theme-toggle .moon { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: none; }
:root[data-theme="dark"] .theme-toggle .moon { display: block; }

.nav-toggle { display: none; }

/* ----- Hero -------------------------------------------------------------- */
.hero {
  text-align: center;
  padding: 84px 0 56px;
  background:
    radial-gradient(1100px 380px at 50% -120px,
      var(--c-primary-soft), transparent 70%);
}
.hero__eyebrow {
  display: inline-block;
  font-size: 0.8rem; font-weight: 600; letter-spacing: .04em;
  text-transform: uppercase; color: var(--c-primary);
  background: var(--c-primary-soft);
  padding: 0.3em 0.9em; border-radius: 999px; margin-bottom: 1.3rem;
}
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.7rem);
  letter-spacing: -0.02em; margin: 0 0 0.35em;
}
.hero h1 .mono { font-family: var(--font-mono); }
.hero__tagline {
  font-size: clamp(1.1rem, 2.6vw, 1.45rem);
  color: var(--c-text-soft);
  max-width: 720px; margin: 0 auto 0.4em;
}
.hero__sub {
  font-size: 1.02rem; color: var(--c-text-soft);
  max-width: 680px; margin: 0 auto 2rem;
}
.hero__cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ----- Byte comparison visual ------------------------------------------- */
.byteviz {
  max-width: 760px; margin: 56px auto 0;
}
.byteviz__row { margin-bottom: 22px; }
.byteviz__head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 8px;
}
.byteviz__label { font-weight: 700; font-size: 1rem; }
.byteviz__label.json { color: var(--c-accent); }
.byteviz__label.mp { color: var(--c-primary); }
.byteviz__size { font-size: 0.85rem; color: var(--c-text-mute); font-family: var(--font-mono); }
.byteviz__bytes {
  display: flex; flex-wrap: wrap; gap: 4px;
  font-family: var(--font-mono); font-size: 0.8rem;
}
.byte {
  min-width: 30px; text-align: center;
  padding: 6px 4px; border-radius: 6px;
  border: 1px solid var(--c-border);
  background: var(--c-bg-soft); color: var(--c-text-soft);
}
.byte.j { background: var(--c-accent-soft); border-color: color-mix(in srgb, var(--c-accent) 30%, transparent); color: var(--c-text); }
.byte.m-hdr  { background: var(--c-primary-soft); border-color: color-mix(in srgb, var(--c-primary) 35%, transparent); color: var(--c-primary-strong); font-weight: 700; }
.byte.m-key  { background: #fff4d6; border-color: #e9c46a; color: #6b4e00; }
.byte.m-val  { background: #d8f3dc; border-color: #74c69d; color: #14532d; }
:root[data-theme="dark"] .byte.m-key { background: #3a2f0a; border-color: #6b5510; color: #e7c86a; }
:root[data-theme="dark"] .byte.m-val { background: #0f2e1a; border-color: #1f7a44; color: #7fdca0; }
.byteviz__note {
  text-align: center; color: var(--c-text-mute);
  font-size: 0.9rem; margin-top: 18px;
}
.byteviz__note b { color: var(--c-primary); }

/* ----- Sections ---------------------------------------------------------- */
.section { padding: 64px 0; }
.section--soft { background: var(--c-bg-soft); border-block: 1px solid var(--c-border-soft); }
.section__head { text-align: center; max-width: 680px; margin: 0 auto 44px; }
.section__head h2 { margin-top: 0; }
.section__head p { color: var(--c-text-soft); font-size: 1.05rem; }
.section__head .kicker {
  color: var(--c-primary); font-weight: 600; font-size: 0.85rem;
  text-transform: uppercase; letter-spacing: .05em;
}

/* ----- Feature grid ------------------------------------------------------ */
.feature-grid {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}
.feature-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border-soft);
  border-radius: var(--radius); padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease;
}
.feature-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--c-border); }
.feature-card__icon {
  width: 42px; height: 42px; border-radius: 9px;
  display: grid; place-items: center; margin-bottom: 14px;
  background: var(--c-primary-soft); color: var(--c-primary);
}
.feature-card__icon svg { width: 22px; height: 22px; }
.feature-card h3 { margin: 0 0 .4em; font-size: 1.1rem; }
.feature-card p { margin: 0; color: var(--c-text-soft); font-size: 0.95rem; }

/* ----- Language cards ---------------------------------------------------- */
.lang-grid {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}
.lang-card {
  display: flex; flex-direction: column; gap: 6px;
  background: var(--c-surface);
  border: 1px solid var(--c-border-soft);
  border-radius: var(--radius); padding: 20px;
  box-shadow: var(--shadow-sm); color: var(--c-text);
  transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease;
}
.lang-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--c-primary); text-decoration: none; }
.lang-card__name { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 1.05rem; }
.lang-card__badge {
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 600;
  color: #fff; padding: 2px 7px; border-radius: 5px; background: var(--c-text-mute);
}
.lang-card p { margin: 0; color: var(--c-text-soft); font-size: 0.9rem; }
.lang-card__meta { margin-top: auto; padding-top: 8px; font-size: 0.82rem; color: var(--c-text-mute); font-family: var(--font-mono); }

/* ----- Code blocks ------------------------------------------------------- */
pre, code, kbd, samp { font-family: var(--font-mono); }
:not(pre) > code {
  background: var(--c-bg-mute);
  border: 1px solid var(--c-border-soft);
  border-radius: 5px;
  padding: 0.13em 0.4em; font-size: 0.88em;
  color: var(--c-text);
}
.code-block {
  position: relative; margin: 1.2em 0;
  background: var(--c-code-bg);
  border: 1px solid var(--c-code-border);
  border-radius: var(--radius); overflow: hidden;
}
.code-block__bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 6px 10px 6px 14px;
  border-bottom: 1px solid var(--c-code-border);
  background: color-mix(in srgb, var(--c-bg-mute) 60%, var(--c-code-bg));
}
.code-block__lang {
  font-size: 0.72rem; font-weight: 600; letter-spacing: .04em;
  text-transform: uppercase; color: var(--c-text-mute);
}
.code-block pre {
  margin: 0; padding: 14px 16px; overflow-x: auto;
  font-size: 0.86rem; line-height: 1.6;
}
.code-block pre code { background: none; border: none; padding: 0; color: var(--c-text); }
.copy-btn {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 0.74rem; font-weight: 600;
  color: var(--c-text-mute); background: transparent;
  border: 1px solid transparent; border-radius: 6px;
  padding: 3px 8px; cursor: pointer; transition: all .15s ease;
}
.copy-btn:hover { color: var(--c-text); background: var(--c-bg); border-color: var(--c-border); }
.copy-btn.copied { color: var(--c-green); }
.copy-btn svg { width: 13px; height: 13px; }

/* syntax tokens */
.tok-keyword { color: var(--syn-keyword); }
.tok-string  { color: var(--syn-string); }
.tok-number  { color: var(--syn-number); }
.tok-comment { color: var(--syn-comment); font-style: italic; }
.tok-func    { color: var(--syn-func); }
.tok-builtin { color: var(--syn-builtin); }
.tok-punct   { color: var(--syn-punct); }

/* ----- Tables ------------------------------------------------------------ */
.table-wrap { overflow-x: auto; margin: 1.3em 0; }
table.table {
  width: 100%; border-collapse: collapse; font-size: 0.92rem;
  border: 1px solid var(--c-border); border-radius: var(--radius); overflow: hidden;
}
table.table th, table.table td {
  text-align: left; padding: 9px 13px;
  border-bottom: 1px solid var(--c-border-soft);
  vertical-align: top;
}
table.table th { background: var(--c-bg-soft); font-weight: 600; }
table.table tr:last-child td { border-bottom: none; }
table.table tbody tr:hover, table.table tr:hover { background: var(--c-bg-soft); }
table.table code { white-space: nowrap; }

/* ----- Notes / callouts -------------------------------------------------- */
.note {
  display: flex; gap: 11px;
  border: 1px solid var(--c-border-soft);
  border-left: 4px solid var(--c-primary);
  background: var(--c-primary-soft);
  border-radius: var(--radius-sm);
  padding: 13px 16px; margin: 1.3em 0; font-size: 0.94rem;
}
.note > svg { flex: none; width: 18px; height: 18px; margin-top: 2px; color: var(--c-primary); }
.note p { margin: 0; }
.note p + p { margin-top: .5em; }
.note--warn { border-left-color: var(--c-amber); background: color-mix(in srgb, var(--c-amber) 9%, var(--c-bg)); }
.note--warn > svg { color: var(--c-amber); }

/* ----- Docs layout (sidebar + content) ----------------------------------- */
.docs {
  display: grid;
  grid-template-columns: 252px minmax(0, 1fr);
  gap: 44px;
  max-width: var(--max-w); margin: 0 auto; padding: 36px 24px 80px;
}
.docs__sidebar {
  position: sticky; top: calc(var(--nav-h) + 24px);
  align-self: start;
  max-height: calc(100vh - var(--nav-h) - 48px);
  overflow-y: auto;
  padding-right: 8px;
}
.docs__content { min-width: 0; max-width: var(--content-w); }
.docs__content h2:first-child, .docs__content > h1 { margin-top: 0; }

.sidenav__filter {
  width: 100%; margin-bottom: 14px;
  padding: 8px 12px; font-size: 0.88rem;
  border: 1px solid var(--c-border); border-radius: var(--radius-sm);
  background: var(--c-surface); color: var(--c-text);
}
.sidenav__filter:focus { outline: none; border-color: var(--c-primary); box-shadow: 0 0 0 3px var(--c-primary-soft); }
.sidenav__group { margin-bottom: 16px; }
.sidenav__title {
  font-size: 0.74rem; font-weight: 700; letter-spacing: .05em;
  text-transform: uppercase; color: var(--c-text-mute);
  margin: 0 0 6px; padding-left: 10px;
}
.sidenav__list { list-style: none; margin: 0; padding: 0; }
.sidenav__list a {
  display: block; padding: 4px 10px; border-radius: 6px;
  font-size: 0.88rem; color: var(--c-text-soft);
  border-left: 2px solid transparent;
}
.sidenav__list a:hover { background: var(--c-bg-mute); color: var(--c-text); text-decoration: none; }
.sidenav__list a.active {
  color: var(--c-primary); background: var(--c-primary-soft);
  border-left-color: var(--c-primary); font-weight: 600;
}
.sidenav__list code { background: none; border: none; padding: 0; font-size: 0.85em; }
.sidenav__empty { padding: 8px 10px; font-size: 0.85rem; color: var(--c-text-mute); display: none; }

/* page title block on doc pages */
.page-title { margin-bottom: 8px; }
.page-title h1 { font-size: 2.2rem; letter-spacing: -0.02em; margin: 0 0 0.2em; }
.page-title p { color: var(--c-text-soft); font-size: 1.08rem; margin: 0; }

/* anchored headings */
.docs__content h2[id], .docs__content h3[id] { scroll-margin-top: calc(var(--nav-h) + 20px); }
.anchor {
  opacity: 0; margin-left: .35em; font-weight: 400;
  color: var(--c-text-mute); text-decoration: none;
}
h2:hover .anchor, h3:hover .anchor { opacity: 1; }

.func {
  border-top: 1px solid var(--c-border-soft);
  padding-top: 8px; margin-top: 36px;
}
.func__sig {
  font-family: var(--font-mono); font-size: 1.02rem; font-weight: 700;
  color: var(--c-primary); background: var(--c-primary-soft);
  display: inline-block; padding: 3px 10px; border-radius: 6px;
  margin: 4px 0;
}

/* ----- Footer ------------------------------------------------------------ */
.footer {
  border-top: 1px solid var(--c-border-soft);
  background: var(--c-bg-soft);
  padding: 48px 0 40px; margin-top: 40px;
  font-size: 0.92rem;
}
.footer__inner {
  display: flex; flex-wrap: wrap; gap: 32px; justify-content: space-between;
  max-width: var(--max-w); margin: 0 auto; padding: 0 24px;
}
.footer__brand { max-width: 320px; }
.footer__brand .navbar__brand { margin-bottom: 8px; }
.footer__brand p { color: var(--c-text-soft); margin: 0; }
.footer__cols { display: flex; gap: 56px; flex-wrap: wrap; }
.footer__col h4 { margin: 0 0 10px; font-size: 0.8rem; text-transform: uppercase; letter-spacing: .04em; color: var(--c-text-mute); }
.footer__col ul { list-style: none; margin: 0; padding: 0; }
.footer__col li { margin-bottom: 6px; }
.footer__col a { color: var(--c-text-soft); }
.footer__col a:hover { color: var(--c-primary); }
.footer__bottom {
  max-width: var(--max-w); margin: 28px auto 0; padding: 18px 24px 0;
  border-top: 1px solid var(--c-border-soft);
  color: var(--c-text-mute); font-size: 0.85rem;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
}

/* ----- Mobile sidebar backdrop ------------------------------------------ */
.backdrop {
  display: none; position: fixed; inset: var(--nav-h) 0 0; z-index: 90;
  background: rgba(0,0,0,.4);
}

/* ----- Responsive -------------------------------------------------------- */
@media (max-width: 900px) {
  .docs { grid-template-columns: 1fr; gap: 0; }
  .docs__sidebar {
    position: fixed; top: var(--nav-h); left: 0; bottom: 0; z-index: 95;
    width: 280px; max-height: none; background: var(--c-surface);
    border-right: 1px solid var(--c-border);
    padding: 18px; transform: translateX(-100%);
    transition: transform .22s ease; box-shadow: var(--shadow-lg);
  }
  body.sidebar-open .docs__sidebar { transform: translateX(0); }
  body.sidebar-open .backdrop { display: block; }
  .docs__content { padding-top: 8px; }
  .docs-fab {
    position: fixed; bottom: 20px; left: 20px; z-index: 96;
    display: inline-flex !important;
  }
}
@media (min-width: 901px) { .docs-fab { display: none; } }

@media (max-width: 760px) {
  .navbar__links {
    position: fixed; top: var(--nav-h); right: 0; left: 0; z-index: 98;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: var(--c-surface); border-bottom: 1px solid var(--c-border);
    padding: 10px 16px 16px; box-shadow: var(--shadow);
    transform: translateY(-130%); transition: transform .22s ease;
    margin-left: 0;
  }
  body.nav-open .navbar__links { transform: translateY(0); }
  .navbar__links a { padding: 0.7em; }
  .navbar__sep { display: none; }
  .navbar__links .btn { justify-content: center; margin-top: 6px; }
  .nav-toggle { display: inline-flex; margin-left: auto; }
  .navbar__links .theme-toggle { display: none; }
  .footer__inner { flex-direction: column; gap: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}