:root {
  --bg: #ffffff;
  --soft: #f6f8fb;
  --card: #ffffff;
  --ink: #111827;
  --muted: #4b5563;
  --line: #e5e7eb;
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --blue-soft: #eff6ff;
  --shadow: 0 1px 2px rgba(17, 24, 39, 0.06);
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --wrap: 1080px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: clip;
}

body.has-cookie { padding-bottom: 5.5rem; }

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

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

a:hover { color: var(--blue-dark); }

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.skip {
  position: absolute;
  left: 0.75rem;
  top: -4rem;
  background: var(--ink);
  color: #fff;
  padding: 0.45rem 0.7rem;
  border-radius: 8px;
  z-index: 50;
}

.skip:focus { top: 0.5rem; }

.wrap {
  width: min(var(--wrap), calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.header-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 3.75rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
}

.brand img { display: block; border-radius: 8px; }

.tld { color: var(--blue); font-weight: 700; }

.nav-btn { display: none; }

.nav {
  display: flex;
  gap: 0.25rem 1.1rem;
  margin-left: auto;
  align-items: center;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.94rem;
  font-weight: 600;
  padding: 0.4rem 0;
  border-bottom: 2px solid transparent;
}

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

.nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--blue);
}

.crumbs { padding-top: 1rem; }

.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 0.45rem;
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--muted);
  font-size: 0.875rem;
}

.crumbs a { text-decoration: none; font-weight: 600; }

.crumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 0.45rem;
  color: #9ca3af;
}

.hero, .page-head, .section, .prose, .panel { padding-top: 1.5rem; }

.hero-grid, .split, .card-grid, .stat-row, .footer-grid, .file-grid {
  display: grid;
  gap: 1rem;
}

.hero-grid > *,
.split > *,
.card-grid > *,
.stat-row > *,
.footer-grid > *,
.file-grid > * { min-width: 0; }

.hero-grid { grid-template-columns: 1.35fr 0.8fr; align-items: start; }

.split-home { grid-template-columns: 1.15fr 0.85fr; align-items: center; }

h1, h2, h3, .brand-line {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--ink);
}

h1 { font-size: clamp(2rem, 4vw, 3rem); margin: 0.35rem 0 0.75rem; }

h2 { font-size: clamp(1.35rem, 2.4vw, 1.75rem); margin: 0 0 0.65rem; }

h3 { font-size: 1.05rem; margin: 0 0 0.35rem; }

.lede, .prose p, .panel p, .card p, .faq p, .ticket p, .callout p { color: var(--muted); }

.lede { font-size: 1.05rem; max-width: 42rem; margin-top: 0; }

.kicker {
  display: inline-block;
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--blue);
}

.actions, .button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1.1rem 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 2.75rem;
  padding: 0.55rem 1rem;
  border-radius: 10px;
  text-decoration: none;
  border: 1px solid transparent;
  font-weight: 650;
  font-size: 0.95rem;
  line-height: 1.2;
}

.btn-primary { background: var(--blue); color: #fff; }

.btn-primary:hover { background: var(--blue-dark); color: #fff; }

.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line); }

.btn-ghost:hover { background: var(--soft); color: var(--ink); }

.btn-small { min-height: 2.25rem; padding: 0.3rem 0.7rem; font-size: 0.85rem; }

.ticket, .card, .panel, .callout, .faq-item, .file-card, .form, .table-wrap {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.ticket, .card, .file-card, .panel, .callout { padding: 1rem 1rem 1.1rem; }

.ticket header, .file-card header {
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  align-items: center;
}

.ticket h2, .file-card h2 { margin: 0; }

.stamp { display: none; }

.meta-list, .plain-list, .footer-grid ul, .check-list {
  margin: 0.35rem 0 0;
  padding: 0;
  list-style: none;
}

.meta-list li, .check-list li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem 0;
  border-top: 1px solid var(--line);
  font-size: 0.92rem;
}

.meta-list span, .check-list span { color: var(--muted); }

.stat-row { grid-template-columns: repeat(4, 1fr); margin-top: 1.25rem; }

.stat {
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.85rem 0.9rem;
}

.stat strong { display: block; font-size: 1rem; }

.stat span { color: var(--muted); font-size: 0.875rem; }

.section { padding-bottom: 0.4rem; }

.card-grid { grid-template-columns: repeat(3, 1fr); }

.file-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: 0.04em;
}

.diagram {
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.steps { counter-reset: step; list-style: none; margin: 0; padding: 0; }

.steps li {
  position: relative;
  padding: 0.15rem 0 0.9rem 2.7rem;
}

.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 8px;
  background: var(--blue-soft);
  color: var(--blue-dark);
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.85rem;
}

.prose { max-width: 74ch; padding-bottom: 2rem; }

.wide { padding-bottom: 2.2rem; }

.wide .lede { max-width: 62rem; }

.prose h2, .wide h2 { margin-top: 1.8rem; }

.prose h3 { margin-top: 1.2rem; }

.prose ul, .prose ol { color: var(--muted); padding-left: 1.15rem; }

.prose li + li { margin-top: 0.3rem; }

.hash {
  display: block;
  margin: 0.45rem 0;
  padding: 0.65rem 0.7rem;
  background: var(--soft);
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1.45;
  overflow-wrap: anywhere;
  word-break: break-word;
  color: var(--ink);
}

p, li, h1, h2, h3, .lede, code { overflow-wrap: anywhere; }

.table-wrap { overflow-x: auto; max-width: 100%; padding: 0.3rem; }

table { width: 100%; border-collapse: collapse; min-width: 36rem; }

th, td {
  text-align: left;
  padding: 0.7rem 0.65rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.tag {
  display: inline-block;
  background: var(--blue-soft);
  color: var(--blue-dark);
  border-radius: 999px;
  padding: 0.12rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
}

.callout-warn { border-color: #fcd34d; background: #fffbeb; }

.faq-list { display: grid; gap: 0.6rem; }

.faq-item { padding: 0.15rem 0.9rem; }

.faq-item summary {
  cursor: pointer;
  font-weight: 650;
  padding: 0.75rem 0;
}

.faq-item p { margin-top: 0; }

.form {
  display: grid;
  gap: 0.75rem;
  padding: 1rem;
  max-width: 36rem;
}

form label { font-weight: 650; display: grid; gap: 0.3rem; }

input, textarea {
  font: inherit;
  color: var(--ink);
  background: #fff;
  border: 1px solid #d1d5db;
  border-radius: 10px;
  padding: 0.65rem 0.7rem;
  width: 100%;
}

input[type="checkbox"],
input[type="radio"] { width: auto; }

textarea { min-height: 8.5rem; resize: vertical; }

.hp {
  position: absolute;
  left: -9999px;
  height: 0;
  overflow: hidden;
}

.alert {
  padding: 0.75rem 0.9rem;
  border-radius: 10px;
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #065f46;
}

.alert-bad { background: #fef2f2; border-color: #fecaca; color: #991b1b; }

.site-footer {
  margin-top: 2.5rem;
  background: var(--soft);
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding: 1.75rem 0 1rem;
}

.site-footer a { color: var(--ink); text-decoration: none; font-weight: 600; }

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

.footer-grid { grid-template-columns: 1.4fr 0.7fr 0.7fr 0.9fr; }

.site-footer h2 { font-size: 0.8rem; letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted); }

.site-footer li { margin: 0.28rem 0; }

.brand-line { font-size: 1.15rem; margin: 0 0 0.35rem; }

.fine, .footer-base { color: #6b7280; font-size: 0.875rem; }

.footer-base { border-top: 1px solid var(--line); margin-top: 1rem; padding-top: 0.75rem; }

.footer-note {
  margin: 0.35rem 0 0;
  font-size: 0.8rem;
  line-height: 1.45;
  font-weight: 400;
  color: #6b7280;
}

.footer-note a { color: #4b5563; font-weight: 600; }

.cookie[hidden] { display: none !important; }

.cookie {
  position: fixed;
  z-index: 40;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
  background: #fff;
  color: var(--ink);
  border-top: 1px solid var(--line);
  padding: 0.55rem 1rem;
  box-shadow: 0 -4px 16px rgba(17, 24, 39, 0.06);
}

.cookie p { margin: 0; font-size: 0.85rem; color: var(--muted); }

.cookie button {
  flex: 0 0 auto;
  font: inherit;
  font-weight: 700;
  background: var(--blue);
  color: #fff;
  border: 0;
  border-radius: 8px;
  min-height: 2.25rem;
  padding: 0.4rem 0.85rem;
  cursor: pointer;
}

.toc { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.8rem 0 1rem; }

.toc a {
  text-decoration: none;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  font-size: 0.85rem;
  font-weight: 600;
}

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

@media (min-width: 901px) {
  label.nav-btn { display: none !important; }
}

@media (max-width: 900px) {
  .hero-grid, .card-grid, .file-grid, .footer-grid, .stat-row, .split, .split-home {
    grid-template-columns: 1fr;
  }

  .header-row { flex-wrap: wrap; }

  label.nav-btn { display: none !important; }

  .nav {
    display: flex;
    width: 100%;
    flex-wrap: wrap;
    gap: 0.15rem 0.85rem;
    margin: 0 0 0.55rem;
  }

  .nav a { padding: 0.35rem 0; border-bottom: 0; }

  .cookie { padding: 0.55rem 0.75rem; }
}

@media (max-width: 640px) {
  .wrap { width: min(var(--wrap), calc(100% - 1.25rem)); }
  h1 { font-size: 1.85rem; }
  .meta-list li { flex-direction: column; gap: 0.1rem; }
  .actions, .button-row { flex-direction: column; align-items: stretch; }
  .actions .btn, .button-row .btn, .file-card .btn { width: 100%; }
}