/* Ultracode Guide — shared stylesheet
   Content-first, zero-JS, system fonts for instant LCP. */

:root {
  --ink: #1a1d23;
  --ink-soft: #4b5563;
  --ink-faint: #6b7280;
  --paper: #ffffff;
  --paper-alt: #f6f7f9;
  --line: #e5e7eb;
  --accent: #d97706;        /* amber-600: echoes Claude's palette without copying it */
  --accent-deep: #92400e;
  --code-bg: #1f2430;
  --code-ink: #e6e8ee;
  --code-comment: #8b93a7;
  --code-string: #a5d6a7;
  --code-keyword: #82aaff;
  --maxw: 46rem;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--ink);
  background: var(--paper);
}

/* ---------- header / nav ---------- */

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper-alt);
}

.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 1.25rem;
  padding: 1rem 1.25rem;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.brand span { color: var(--accent); }

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 1.1rem;
  font-size: 0.92rem;
}

.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--accent-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- layout ---------- */

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
}

main { padding: 2.25rem 0 3rem; }

.crumbs {
  font-size: 0.85rem;
  color: var(--ink-faint);
  margin-bottom: 1.25rem;
}

.crumbs a { color: inherit; }

h1 {
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}

h2 {
  font-size: 1.4rem;
  line-height: 1.3;
  letter-spacing: -0.015em;
  margin: 2.4rem 0 0.75rem;
}

h3 {
  font-size: 1.12rem;
  margin: 1.8rem 0 0.5rem;
}

p { margin: 0.75rem 0; }

a { color: var(--accent-deep); }

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

ul, ol { padding-left: 1.4rem; }

li { margin: 0.3rem 0; }

.meta {
  color: var(--ink-faint);
  font-size: 0.9rem;
  margin-bottom: 1.75rem;
}

.lead {
  font-size: 1.15rem;
  color: var(--ink);
}

/* ---------- callouts ---------- */

.answer-box {
  background: var(--paper-alt);
  border-left: 4px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
}

.note {
  background: var(--paper-alt);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.9rem 1.15rem;
  margin: 1.25rem 0;
  font-size: 0.97rem;
}

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

.note .note-title {
  font-weight: 700;
  margin-bottom: 0.25rem;
}

/* ---------- code ---------- */

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.88em;
  background: var(--paper-alt);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0.1em 0.35em;
}

pre {
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.6;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.tok-c { color: var(--code-comment); }
.tok-s { color: var(--code-string); }
.tok-k { color: var(--code-keyword); }

kbd {
  font-family: inherit;
  font-size: 0.85em;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--paper-alt);
  padding: 0.1em 0.45em;
  white-space: nowrap;
}

/* ---------- tables ---------- */

.table-scroll { overflow-x: auto; }

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.95rem;
  margin: 1.25rem 0;
}

th, td {
  text-align: left;
  border: 1px solid var(--line);
  padding: 0.55rem 0.8rem;
  vertical-align: top;
}

th { background: var(--paper-alt); }

/* ---------- cards / TOC ---------- */

.toc {
  background: var(--paper-alt);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1rem 1.25rem 1.1rem;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.toc-title {
  font-weight: 700;
  margin: 0 0 0.4rem;
}

.toc ol { margin: 0; }

.next-steps {
  display: grid;
  gap: 0.75rem;
  margin: 2rem 0;
  padding: 0;
  list-style: none;
}

.next-steps a {
  display: block;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.85rem 1.1rem;
  text-decoration: none;
}

.next-steps a:hover {
  border-color: var(--accent);
  background: #fffaf2;
}

.next-steps .ns-title {
  font-weight: 700;
  color: var(--ink);
}

.next-steps .ns-desc {
  font-size: 0.9rem;
  color: var(--ink-soft);
}

/* ---------- FAQ ---------- */

details {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 1.1rem;
  margin: 0.6rem 0;
  background: var(--paper);
}

details[open] { padding-bottom: 0.4rem; }

summary {
  font-weight: 600;
  cursor: pointer;
  padding: 0.7rem 0;
  list-style: revert;
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--paper-alt);
  margin-top: 3rem;
}

.site-footer .wrap {
  padding: 1.5rem 1.25rem 2rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.disclaimer {
  margin: 0 0 0.5rem;
}

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

/* ---------- ad slot (placeholder until AdSense approval) ---------- */

.ad-slot {
  margin: 2rem 0;
  min-height: 0;
}

@media (max-width: 480px) {
  body { font-size: 1rem; }
  .site-header .wrap { padding: 0.85rem 1rem; }
}