/* ===========================================================
   guide-openclaw.online — global styles
   Design tokens, layout, components, accessibility, dark mode.
   =========================================================== */

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Helvetica Neue', Arial, 'PingFang SC', 'Hiragino Sans GB',
    'Microsoft YaHei', sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--link); text-decoration: none; }
a:hover, a:focus-visible { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; border-radius: 4px; }

/* ---------- Design tokens ---------- */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f7fb;
  --bg-elevated: #ffffff;
  --fg: #14181f;
  --fg-muted: #4a5260;
  --fg-subtle: #6b7280;
  --border: #e6e8ee;
  --link: #1559c6;
  --link-hover: #0d3f8f;
  --brand: #d23b27;          /* lobster red */
  --brand-dark: #a8291a;
  --accent: #1d6fdc;
  --code-bg: #0f1623;
  --code-fg: #e9eef9;
  --kbd-bg: #f2f3f7;
  --shadow: 0 6px 24px rgba(15, 22, 35, 0.06);
  --radius: 12px;
  --maxw: 1120px;
  --maxw-prose: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f131b;
    --bg-soft: #161b25;
    --bg-elevated: #1b2230;
    --fg: #e9edf5;
    --fg-muted: #b3bccd;
    --fg-subtle: #8a93a4;
    --border: #262e3d;
    --link: #6aa7ff;
    --link-hover: #9cc2ff;
    --brand: #ff6e57;
    --brand-dark: #ff8673;
    --accent: #6aa7ff;
    --code-bg: #0a0f17;
    --code-fg: #e9eef9;
    --kbd-bg: #1f2633;
    --shadow: 0 6px 28px rgba(0, 0, 0, 0.45);
  }
}

/* ---------- Layout primitives ---------- */
.container { width: min(100% - 2rem, var(--maxw)); margin-inline: auto; }
.container-prose { width: min(100% - 2rem, var(--maxw-prose)); margin-inline: auto; }
.stack > * + * { margin-top: var(--gap, 1rem); }

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--brand); color: #fff; padding: .5rem .9rem;
  border-radius: 0 0 8px 0; z-index: 1000;
}
.skip-link:focus { left: 0; }

/* ---------- Site header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.site-header__inner {
  display: flex; align-items: center; gap: 1rem;
  padding: .85rem 0;
}
.brand { display: inline-flex; align-items: center; gap: .55rem; font-weight: 700; color: var(--fg); }
.brand:hover { text-decoration: none; }
.brand__mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, var(--brand) 0%, #ff7a4d 100%);
  display: grid; place-items: center; color: #fff; font-weight: 800;
  box-shadow: 0 2px 8px rgba(210,59,39,.35);
}
.brand__name { font-size: 1.05rem; letter-spacing: -0.01em; }
.brand__name span { color: var(--brand); }
.nav { margin-left: auto; display: flex; gap: .25rem; flex-wrap: wrap; }
.nav a {
  padding: .45rem .7rem; border-radius: 8px;
  color: var(--fg-muted); font-weight: 500;
}
.nav a:hover, .nav a:focus-visible { background: var(--bg-soft); color: var(--fg); text-decoration: none; }
.nav a.is-active { color: var(--fg); background: var(--bg-soft); }
.lang-switch {
  margin-left: .5rem; display: inline-flex; border: 1px solid var(--border);
  border-radius: 999px; overflow: hidden;
}
.lang-switch a {
  padding: .35rem .7rem; font-size: .82rem; color: var(--fg-muted);
  font-weight: 600;
}
.lang-switch a.is-active { background: var(--brand); color: #fff; }
.lang-switch a:not(.is-active):hover { color: var(--fg); text-decoration: none; background: var(--bg-soft); }

/* Mobile nav */
.nav-toggle { display: none; }
@media (max-width: 760px) {
  .nav-toggle {
    display: inline-flex; align-items: center; gap: .35rem;
    margin-left: auto;
    border: 1px solid var(--border); background: var(--bg-elevated);
    color: var(--fg); padding: .4rem .65rem; border-radius: 8px; cursor: pointer;
  }
  .nav {
    display: none; position: absolute; left: 0; right: 0; top: 100%;
    flex-direction: column; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
    padding: .5rem 1rem 1rem;
  }
  .nav.is-open { display: flex; }
  .nav a { width: 100%; }
  .lang-switch { align-self: flex-start; margin-left: 0; margin-top: .5rem; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: clamp(2.5rem, 6vw, 5rem) 0 clamp(2rem, 5vw, 4rem);
  background:
    radial-gradient(60% 60% at 80% 0%, rgba(210,59,39,.10), transparent 60%),
    radial-gradient(50% 50% at 0% 30%, rgba(29,111,220,.10), transparent 60%);
  overflow: hidden;
}
.hero__grid { display: grid; gap: 2.5rem; align-items: center; grid-template-columns: 1.2fr 1fr; }
@media (max-width: 900px) { .hero__grid { grid-template-columns: 1fr; } }
.hero h1 {
  font-size: clamp(1.9rem, 4.6vw, 3.1rem);
  line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 1rem;
}
.hero h1 .accent { color: var(--brand); }
.hero p.lead { font-size: 1.15rem; color: var(--fg-muted); max-width: 56ch; }
.hero__cta { display: flex; gap: .75rem; margin-top: 1.5rem; flex-wrap: wrap; }
.hero__art {
  border-radius: var(--radius);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 1rem;
}
.hero__art pre { margin: 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .7rem 1.1rem; border-radius: 10px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .08s ease, background .2s ease, border-color .2s ease, color .2s ease;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn--primary { background: var(--brand); color: #fff; }
.btn--primary:hover { background: var(--brand-dark); color: #fff; }
.btn--ghost { background: transparent; color: var(--fg); border-color: var(--border); }
.btn--ghost:hover { background: var(--bg-soft); }

/* ---------- Sections ---------- */
.section { padding: clamp(2.5rem, 5vw, 4rem) 0; }
.section--soft { background: var(--bg-soft); }
.section h2 {
  font-size: clamp(1.4rem, 2.6vw, 1.9rem); letter-spacing: -0.01em;
  margin: 0 0 .4rem;
}
.section .lead { color: var(--fg-muted); margin-top: 0; max-width: 60ch; }

/* ---------- Card grid ---------- */
.cards {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin-top: 1.75rem;
}
.card {
  display: block;
  background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.1rem 1.2rem;
  color: var(--fg);
  transition: transform .12s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--brand) 40%, var(--border)); text-decoration: none; }
.card__tag { font-size: .75rem; color: var(--brand); font-weight: 700; letter-spacing: .04em; text-transform: uppercase; }
.card__title { font-size: 1.05rem; font-weight: 700; margin: .35rem 0 .35rem; }
.card__desc { color: var(--fg-muted); font-size: .95rem; }

/* ---------- Post list ---------- */
.post-list { list-style: none; padding: 0; margin: 1.25rem 0 0; display: grid; gap: .9rem; }
.post-list li {
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-elevated); padding: 1rem 1.1rem;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.post-list li:hover { border-color: color-mix(in srgb, var(--brand) 30%, var(--border)); box-shadow: var(--shadow); }
.post-list a.title { font-weight: 700; color: var(--fg); font-size: 1.05rem; }
.post-list a.title:hover { color: var(--brand); text-decoration: none; }
.post-list .meta { font-size: .85rem; color: var(--fg-subtle); margin-top: .25rem; }
.post-list .excerpt { color: var(--fg-muted); margin-top: .4rem; }

/* ---------- Article (prose) ---------- */
.prose { max-width: var(--maxw-prose); margin-inline: auto; }
.prose h1, .prose h2, .prose h3 { letter-spacing: -0.01em; line-height: 1.25; }
.prose h1 { font-size: clamp(1.8rem, 3.5vw, 2.4rem); margin-top: 0; }
.prose h2 { font-size: 1.55rem; margin-top: 2.2rem; }
.prose h3 { font-size: 1.2rem; margin-top: 1.6rem; }
.prose p, .prose ul, .prose ol { margin: 1rem 0; }
.prose ul, .prose ol { padding-left: 1.25rem; }
.prose li + li { margin-top: .3rem; }
.prose blockquote {
  margin: 1.4rem 0; padding: .9rem 1.1rem;
  border-left: 4px solid var(--brand);
  background: var(--bg-soft); border-radius: 8px; color: var(--fg-muted);
}
.prose hr { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }

.prose code {
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--kbd-bg); color: var(--fg);
  padding: .12rem .4rem; border-radius: 6px; font-size: .92em;
}
.prose pre {
  background: var(--code-bg); color: var(--code-fg);
  padding: 1rem 1.1rem; border-radius: var(--radius);
  overflow: auto; font-size: .92rem; line-height: 1.55;
  border: 1px solid color-mix(in srgb, var(--code-fg) 8%, transparent);
}
.prose pre code { background: transparent; color: inherit; padding: 0; font-size: inherit; }

.kbd {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: .82em; background: var(--kbd-bg); padding: .15rem .45rem;
  border-radius: 6px; border: 1px solid var(--border);
}

.callout {
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1rem 1.1rem; background: var(--bg-soft);
  display: flex; gap: .75rem; margin: 1.2rem 0;
}
.callout--info { border-left: 4px solid var(--accent); }
.callout--warn { border-left: 4px solid #e0a100; }
.callout__icon { font-size: 1.1rem; line-height: 1; }
.callout__body { color: var(--fg-muted); }
.callout__body strong { color: var(--fg); }

/* ---------- Table of contents ---------- */
.toc {
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1rem 1.1rem; background: var(--bg-soft);
  margin: 1rem 0 1.5rem;
}
.toc__title { font-size: .85rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; color: var(--fg-subtle); margin-bottom: .4rem; }
.toc ul { margin: 0; padding-left: 1.1rem; }
.toc a { color: var(--fg-muted); }
.toc a:hover { color: var(--brand); }

/* ---------- Article meta ---------- */
.article-meta {
  display: flex; flex-wrap: wrap; gap: .75rem 1.2rem; align-items: center;
  color: var(--fg-subtle); font-size: .9rem; margin: .5rem 0 1.5rem;
}
.article-meta .pill {
  border: 1px solid var(--border); padding: .12rem .55rem; border-radius: 999px;
  background: var(--bg-elevated); color: var(--fg-muted); font-weight: 600;
}
.article-meta .pill--brand { background: color-mix(in srgb, var(--brand) 12%, var(--bg-elevated)); color: var(--brand); border-color: color-mix(in srgb, var(--brand) 30%, var(--border)); }

.author-box {
  display: flex; gap: 1rem; align-items: center;
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1rem 1.1rem; background: var(--bg-elevated);
  margin-top: 2rem;
}
.author-box__avatar {
  width: 52px; height: 52px; border-radius: 50%;
  background: linear-gradient(135deg, #ff7a4d, var(--brand));
  display: grid; place-items: center; color: #fff; font-weight: 800;
}
.author-box__name { font-weight: 700; }
.author-box__bio { color: var(--fg-muted); font-size: .92rem; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border); margin-top: 3rem;
  padding: 2rem 0 2.5rem; color: var(--fg-muted); font-size: .92rem;
}
.site-footer__grid { display: grid; gap: 1.5rem; grid-template-columns: 1.5fr repeat(3, 1fr); }
@media (max-width: 760px) { .site-footer__grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .site-footer__grid { grid-template-columns: 1fr; } }
.site-footer h4 { font-size: .85rem; letter-spacing: .06em; text-transform: uppercase; color: var(--fg-subtle); margin: 0 0 .6rem; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li + li { margin-top: .35rem; }
.site-footer a { color: var(--fg-muted); }
.site-footer a:hover { color: var(--fg); }
.site-footer__bottom {
  border-top: 1px solid var(--border); margin-top: 1.5rem; padding-top: 1.2rem;
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
}

/* ---------- Ad slots (AdSense-compatible responsive placeholders) ---------- */
.ad-slot {
  margin: 1.5rem 0;
  border: 1px dashed var(--border);
  background: repeating-linear-gradient(
    -45deg,
    var(--bg-soft) 0 10px,
    transparent 10px 20px
  );
  border-radius: var(--radius);
  min-height: 90px;
  display: grid; place-items: center;
  color: var(--fg-subtle);
  font-size: .8rem; letter-spacing: .06em; text-transform: uppercase;
}
.ad-slot--leaderboard { min-height: 90px; }
.ad-slot--rectangle  { min-height: 250px; max-width: 336px; margin-inline: auto; }
.ad-slot--in-article { min-height: 120px; }
.ad-slot--sticky-footer {
  position: sticky; bottom: 0; z-index: 40;
  margin: 0; border-radius: 0; border-left: 0; border-right: 0; min-height: 60px;
  background: var(--bg-elevated);
}
@media (max-width: 760px) {
  .ad-slot--sticky-footer { padding: .25rem 1rem; }
}

/* ---------- Cookie banner ---------- */
.cookie-banner {
  position: fixed; inset: auto 1rem 1rem 1rem; z-index: 100;
  background: var(--bg-elevated); color: var(--fg);
  border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1.1rem; display: flex; gap: 1rem; align-items: center; flex-wrap: wrap;
}
.cookie-banner p { margin: 0; color: var(--fg-muted); flex: 1 1 280px; }
.cookie-banner[hidden] { display: none; }
.cookie-banner .btn { padding: .55rem .9rem; font-size: .92rem; }

/* ---------- Utilities ---------- */
.text-muted { color: var(--fg-muted); }
.text-subtle { color: var(--fg-subtle); }
.center { text-align: center; }
.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: .5rem !important; }
.mt-2 { margin-top: 1rem !important; }
.mt-3 { margin-top: 1.5rem !important; }
.mt-4 { margin-top: 2rem !important; }
.mb-0 { margin-bottom: 0 !important; }
.flex { display: flex; gap: 1rem; flex-wrap: wrap; align-items: center; }
.divider { height: 1px; background: var(--border); margin: 1.5rem 0; }
.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;
}

/* ---------- Print ---------- */
@media print {
  .site-header, .site-footer, .ad-slot, .cookie-banner, .nav-toggle { display: none !important; }
  body { color: #000; background: #fff; }
  .prose a::after { content: " (" attr(href) ")"; font-size: .85em; color: #555; }
}