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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: clip;
  background:
    radial-gradient(1100px 700px at 88% -12%, var(--brand-soft), transparent 62%),
    radial-gradient(900px 600px at -10% 30%, color-mix(in srgb, var(--accent-soft) 55%, transparent), transparent 60%),
    var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color var(--t-slow) var(--ease), color var(--t-slow) var(--ease);
}

[data-theme="dark"] body {
  background:
    radial-gradient(1100px 700px at 88% -12%, rgba(91, 214, 200, 0.08), transparent 62%),
    radial-gradient(900px 600px at -10% 30%, rgba(255, 123, 110, 0.05), transparent 60%),
    var(--bg);
}

::selection { background: var(--brand); color: var(--on-brand); }

h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
img, svg, canvas { display: block; max-width: 100%; }
small { font-size: 12.5px; }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: var(--ink);
  color: var(--bg);
  transition: top var(--t-fast) var(--ease);
}
.skip-link:focus { top: 12px; }

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  min-height: 100vh;
  min-height: 100dvh;
}

.app-sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar-w);
  z-index: var(--z-sidebar);
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 24px 16px 18px;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: color-mix(in srgb, var(--bg-elev) 88%, transparent);
  border-right: 1px solid var(--line);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.app-main {
  grid-column: 2;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.page {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 26px 30px 64px;
  animation: page-in var(--t-base) var(--ease) both;
}

@keyframes page-in {
  from { opacity: 0; transform: translateY(7px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
}

.page-eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  color: var(--brand);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.page-title {
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.035em;
  font-weight: 750;
}

.page-sub {
  max-width: 720px;
  margin-top: 8px;
  color: var(--muted);
  font-size: 15px;
}

.section {
  margin-top: 40px;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.section-title {
  font-size: 21px;
  letter-spacing: -0.02em;
  font-weight: 720;
}

.section-kicker {
  color: var(--muted);
  font-size: 12.5px;
}

.stack { display: flex; flex-direction: column; gap: 14px; }
.stack-lg { display: flex; flex-direction: column; gap: 24px; }
.row { display: flex; align-items: center; gap: 10px; }
.row-wrap { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; }
.spread { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.grow { flex: 1 1 auto; min-width: 0; }
.muted { color: var(--muted); }
.faint { color: var(--faint); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.serif { font-family: var(--font-serif); }
.strong { font-weight: 700; }
.nowrap { white-space: nowrap; }
.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

.write-grid { display: grid; gap: 22px; }
@media (min-width: 1100px) {
  .write-grid { grid-template-columns: minmax(0, 1fr) 300px; align-items: start; }
}

.boot-splash {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: var(--brand);
}
.boot-mark {
  width: 66px; height: 66px;
  display: grid; place-items: center;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: var(--shadow-1);
  animation: boot-pulse 1.6s var(--ease) infinite;
}
.boot-title { margin-top: 10px; color: var(--ink); font-weight: 750; letter-spacing: -0.02em; }
.boot-sub { color: var(--muted); font-size: 12px; }
@keyframes boot-pulse {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

.noscript {
  position: fixed;
  inset: auto 16px 16px;
  z-index: 100;
  padding: 14px;
  border-radius: var(--radius-md);
  background: var(--warn-soft);
  color: var(--ink);
}

@media (max-width: 1099px) {
  .app-shell { grid-template-columns: minmax(0, 1fr); }
  .app-sidebar { display: none; }
  .app-main { grid-column: 1; }
  .page { padding: 18px 20px 96px; }
}

@media (max-width: 719px) {
  body { font-size: 15.5px; }
  .page { padding: 14px 15px calc(var(--bottomnav-h) + 30px + env(safe-area-inset-bottom)); }
  .page-head { flex-direction: column; align-items: flex-start; gap: 12px; }
  .page-title { font-size: clamp(26px, 8vw, 34px); }
  .section { margin-top: 30px; }
  .section-head { align-items: flex-start; flex-direction: column; gap: 4px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}