:root {
  color-scheme: light;
  --bg: #f6f4ef;
  --surface: #fffdf8;
  --surface-strong: #ffffff;
  --ink: #22252b;
  --muted: #5d6470;
  --line: #d8d5ce;
  --blue: #2f5f8f;
  --green: #28715e;
  --rust: #a14c2f;
  --gold: #b9851f;
  --shadow: 0 18px 42px rgba(34, 37, 43, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a {
  color: var(--blue);
  text-underline-offset: 0.18em;
}

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 20;
  padding: 0.65rem 0.85rem;
  background: var(--ink);
  color: #fff;
  border-radius: 6px;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 253, 248, 0.94);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-width: 0;
  color: var(--ink);
  text-decoration: none;
  font-weight: 750;
  letter-spacing: 0;
}

.brand-mark {
  width: 2rem;
  height: 2rem;
  border-radius: 6px;
  background:
    linear-gradient(135deg, var(--blue) 0 48%, transparent 48% 52%, var(--green) 52% 100%);
  border: 1px solid rgba(34, 37, 43, 0.14);
  flex: 0 0 auto;
}

.nav {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
  justify-content: flex-end;
  font-size: 0.92rem;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
}

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

.main {
  max-width: 920px;
  margin: 0 auto;
  padding: 3.5rem 1.25rem 4rem;
}

.main > h1:first-child {
  margin-top: 0;
  max-width: 12ch;
  font-size: clamp(2.4rem, 5vw, 4.8rem);
}

h1,
h2,
h3 {
  line-height: 1.15;
  letter-spacing: 0;
}

h1 {
  margin: 0 0 1rem;
}

h2 {
  margin: 3.2rem 0 1rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line);
  font-size: clamp(1.7rem, 3vw, 2.5rem);
}

h3 {
  margin: 1.8rem 0 0.55rem;
  font-size: 1.2rem;
}

p,
li {
  color: var(--ink);
}

.lead {
  max-width: 68ch;
  margin: 1.35rem 0 2rem;
  font-size: 1.12rem;
  color: var(--muted);
}

.callout,
.warning,
.note {
  margin: 1.35rem 0;
  padding: 1rem 1.1rem;
  border-left: 4px solid var(--green);
  border-radius: 6px;
  background: #edf4f1;
}

.warning {
  background: #fbefe8;
  border-left-color: var(--rust);
}

.note {
  background: #f6efd9;
  border-left-color: var(--gold);
}

.quick-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 1.35rem 0;
}

.quick-flow > div {
  min-height: 6.2rem;
  padding: 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--surface-strong);
}

.quick-flow strong {
  display: block;
  color: var(--blue);
  margin-bottom: 0.35rem;
}

ul,
ol {
  padding-left: 1.3rem;
}

li + li {
  margin-top: 0.38rem;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.95em;
  background: rgba(47, 95, 143, 0.09);
  padding: 0.1rem 0.25rem;
  border-radius: 4px;
}

pre {
  overflow-x: auto;
  margin: 1rem 0;
  padding: 1rem;
  background: #20242a;
  color: #f7f2e8;
  border-radius: 8px;
  line-height: 1.45;
}

pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.4rem;
  background: var(--surface-strong);
  border: 1px solid var(--line);
}

th,
td {
  padding: 0.75rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: #eee9df;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 2rem 1.25rem;
  color: var(--muted);
}

.footer-inner {
  max-width: 920px;
  margin: 0 auto;
}

@media (max-width: 860px) {
  .header-inner {
    display: block;
  }

  .nav {
    justify-content: flex-start;
    margin-top: 0.8rem;
  }

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

@media (max-width: 560px) {
  .header-inner,
  .main,
  .footer {
    padding-left: 1rem;
    padding-right: 1rem;
  }
}

@media print {
  .site-header {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  .main,
  .footer-inner {
    max-width: none;
  }
}