/*
 * ZhiHuo Theme v2 — theme.css
 * ─────────────────────────────────────────────
 * Bootstrap 5 override + ZhiHuo design system
 *
 * MAINTENANCE:
 * Edit CSS variables in :root to change the entire site.
 * Content inside .zh-docs-content auto-inherits all heading,
 * paragraph, list, code, and video styles — just write HTML.
 * ─────────────────────────────────────────────
 */

/* ── TOKENS ────────────────────────────────── */
:root {
  --zh-ink:         #0d1117;
  --zh-ink-2:       #161c25;
  --zh-ink-3:       #1e2a38;
  --zh-ink-4:       #253347;

  --zh-steel:       #1d6fa4;
  --zh-steel-hi:    #2d8cc4;
  --zh-steel-lo:    #114966;

  --zh-spark:       #00c8e8;   /* single bright accent */
  --zh-spark-dim:   rgba(0,200,232,.12);

  --zh-text:        #c9d8e8;
  --zh-text-dim:    #6e8ca8;
  --zh-text-bright: #eaf2fb;

  --zh-rule:        rgba(29,111,164,.22);
  --zh-r:           4px;

  /* bootstrap resets */
  --bs-body-bg:          var(--zh-ink);
  --bs-body-color:       var(--zh-text);
  --bs-font-sans-serif:  'DM Sans', sans-serif;
  --bs-link-color:       var(--zh-spark);
}

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

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--zh-ink);
  color: var(--zh-text);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--zh-spark); text-decoration: none; }
a:hover { color: #fff; }

/* ── NAV ───────────────────────────────────── */
.zh-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13,17,23,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--zh-rule);
}
.zh-nav .container {
  display: flex;
  align-items: center;
  gap: 2rem;
  height: 60px;
}
.zh-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.zh-logo-mark {
  width: 28px;
  height: 28px;
  background: var(--zh-steel);
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}
.zh-logo-mark::before,
.zh-logo-mark::after {
  content: '';
  position: absolute;
  left: 0; right: 0;
  height: 8px;
  background: var(--zh-ink);
}
.zh-logo-mark::before { top: 0; clip-path: polygon(0 0, 100% 0, 100% 100%, 40% 100%); }
.zh-logo-mark::after  { bottom: 0; clip-path: polygon(60% 0, 100% 0, 100% 100%, 0 100%); }
.zh-logo-text {
  font-family: 'Bebas Neue', 'Barlow Condensed', sans-serif;
  font-size: 1.35rem;
  letter-spacing: .12em;
  color: var(--zh-text-bright);
  line-height: 1;
}
.zh-logo-text span { color: var(--zh-spark); }
.zh-logo img {
  height: 60px;
  width: auto !important; /* override inline width:300px */
}
@media (max-width: 768px) {
  .zh-logo img { height: 40px; }
}

.zh-nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
}
.zh-nav-links a {
  display: block;
  padding: 0 1rem;
  height: 60px;
  line-height: 60px;
  font-size: .78rem;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--zh-text-dim);
  border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s;
}
.zh-nav-links a:hover,
.zh-nav-links a.active {
  color: var(--zh-text-bright);
  border-bottom-color: var(--zh-spark);
}

.zh-nav-right { margin-left: auto; display: flex; align-items: center; gap: .75rem; }

/* hamburger (mobile) */
.zh-nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--zh-rule);
  color: var(--zh-text-dim);
  border-radius: var(--zh-r);
  padding: .35rem .6rem;
  cursor: pointer;
  margin-left: auto;
}
@media (max-width: 768px) {
  .zh-nav-toggle { display: block; }
  .zh-nav-links   { display: none; flex-direction: column; position: absolute; top: 60px; left: 0; right: 0; background: var(--zh-ink-2); border-bottom: 1px solid var(--zh-rule); padding: .5rem 0; }
  .zh-nav-links.open { display: flex; }
  .zh-nav-links a { height: auto; line-height: 1; padding: .75rem 1.5rem; }
}

/* ── BUTTONS ───────────────────────────────── */
.btn-zh {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  border-radius: var(--zh-r);
  padding: .6rem 1.4rem;
  transition: background .15s, color .15s, border-color .15s;
  cursor: pointer;
  white-space: nowrap;
}
.btn-zh-primary {
  background: var(--zh-steel);
  border: 1px solid var(--zh-steel);
  color: #fff;
}
.btn-zh-primary:hover {
  background: var(--zh-steel-hi);
  border-color: var(--zh-steel-hi);
  color: #fff;
}
.btn-zh-outline {
  background: transparent;
  border: 1px solid var(--zh-rule);
  color: var(--zh-text-dim);
}
.btn-zh-outline:hover {
  border-color: var(--zh-steel);
  color: var(--zh-text-bright);
}
.btn-zh-ghost {
  background: var(--zh-spark-dim);
  border: 1px solid rgba(0,200,232,.3);
  color: var(--zh-spark);
}
.btn-zh-ghost:hover {
  background: rgba(0,200,232,.2);
  color: #fff;
}
.btn-zh-sm { padding: .4rem .9rem; font-size: .72rem; }

/* ── HERO ──────────────────────────────────── */
.zh-hero {
  background: var(--zh-ink);
  padding: 6rem 0 5rem;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--zh-rule);
}
/* subtle grid lines */
.zh-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--zh-rule) 1px, transparent 1px),
    linear-gradient(90deg, var(--zh-rule) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
  opacity: .4;
  pointer-events: none;
}
/* corner accent bar */
.zh-hero::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--zh-spark), transparent);
}

.zh-hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--zh-spark);
  margin-bottom: 1.25rem;
}
.zh-hero-kicker::before {
  content: '';
  display: inline-block;
  width: 20px;
  height: 2px;
  background: var(--zh-spark);
}

.zh-hero-h1 {
  font-family: 'Bebas Neue', 'Barlow Condensed', sans-serif;
  font-size: clamp(3.2rem, 8vw, 6rem);
  line-height: .95;
  letter-spacing: .02em;
  color: var(--zh-text-bright);
  margin-bottom: 1.5rem;
}
.zh-hero-h1 em {
  font-style: normal;
  color: var(--zh-spark);
}

.zh-hero-body {
  font-size: 1rem;
  color: var(--zh-text-dim);
  max-width: 480px;
  margin-bottom: 2rem;
  line-height: 1.7;
}

/* Z-glyph decoration */
.zh-z-deco {
  position: absolute;
  right: -60px;
  top: 50%;
  transform: translateY(-50%);
  width: 420px;
  height: 420px;
  opacity: .06;
  pointer-events: none;
}
.zh-z-deco svg { width: 100%; height: 100%; }

/* ── SECTION SCAFFOLDING ───────────────────── */
.zh-section         { padding: 5rem 0; }
.zh-section-alt     { background: var(--zh-ink-2); }
.zh-section-border  { border-top: 1px solid var(--zh-rule); }

.zh-label {
  font-size: .7rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--zh-spark);
  margin-bottom: .75rem;
  display: flex;
  align-items: center;
  gap: .5rem;
}
.zh-label::before {
  content: '';
  display: inline-block;
  width: 16px;
  height: 2px;
  background: var(--zh-spark);
}

.zh-h2 {
  font-family: 'Bebas Neue', 'Barlow Condensed', sans-serif;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1;
  letter-spacing: .04em;
  color: var(--zh-text-bright);
  margin-bottom: .75rem;
}
.zh-h2-sub {
  color: var(--zh-text-dim);
  font-size: .95rem;
  max-width: 500px;
}

/* ── PRODUCT CARDS ─────────────────────────── */
.zh-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5px; }
@media (max-width: 768px) { .zh-cards { grid-template-columns: 1fr; } }

.zh-card {
  background: var(--zh-ink-2);
  padding: 2.5rem 2rem;
  border: 1px solid var(--zh-rule);
  display: flex;
  flex-direction: column;
  gap: 0;
  transition: border-color .2s, background .2s;
  position: relative;
}
.zh-card:hover {
  border-color: rgba(29,111,164,.6);
  background: var(--zh-ink-3);
}
.zh-card-edition {
  font-family: 'Bebas Neue', 'Barlow Condensed', sans-serif;
  font-size: 4.5rem;
  line-height: 1;
  letter-spacing: -.01em;
  color: rgba(29,111,164,.18);
  margin-bottom: .25rem;
  transition: color .2s;
}
.zh-card:hover .zh-card-edition { color: rgba(0,200,232,.22); }
.zh-card-name {
  font-family: 'Bebas Neue', 'Barlow Condensed', sans-serif;
  font-size: 1.5rem;
  letter-spacing: .06em;
  color: var(--zh-text-bright);
  margin-bottom: .75rem;
}
.zh-card-desc {
  font-size: .88rem;
  color: var(--zh-text-dim);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 1.5rem;
}
.zh-card-features {
  list-style: none;
  padding: 0;
  margin: 0 0 1.75rem;
  display: flex;
  flex-direction: column;
  gap: .35rem;
}
.zh-card-features li {
  font-size: .82rem;
  color: var(--zh-text);
  padding-left: 1rem;
  position: relative;
}
.zh-card-features li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--zh-steel);
  font-size: .65rem;
  top: .2em;
}
.zh-card-foot {
  border-top: 1px solid var(--zh-rule);
  padding-top: 1.25rem;
  display: flex;
  gap: .6rem;
}

/* featured card */
.zh-card-featured {
  border-top: 2px solid var(--zh-spark);
}
.zh-card-featured .zh-card-edition { color: rgba(0,200,232,.25); }

/* ── PILLARS ───────────────────────────────── */
.zh-pillars {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--zh-rule);
  border: 1px solid var(--zh-rule);
  border-radius: var(--zh-r);
  overflow: hidden;
}
@media (min-width: 992px) { .zh-pillars { grid-template-columns: repeat(4, 1fr); } }

.zh-pillar {
  background: var(--zh-ink-2);
  padding: 2rem 1.5rem;
  transition: background .2s;
}
.zh-pillar:hover { background: var(--zh-ink-3); }
.zh-pillar-icon {
  font-size: 1.3rem;
  margin-bottom: .75rem;
  color: var(--zh-spark);
  opacity: .7;
}
.zh-pillar h4 {
  font-family: 'Bebas Neue', 'Barlow Condensed', sans-serif;
  font-size: 1.05rem;
  letter-spacing: .06em;
  color: var(--zh-text-bright);
  margin-bottom: .4rem;
}
.zh-pillar p {
  font-size: .82rem;
  color: var(--zh-text-dim);
  line-height: 1.6;
  margin: 0;
}

/* ── PAGE HERO (product pages) ─────────────── */
.zh-page-hero {
  background: var(--zh-ink-2);
  border-bottom: 1px solid var(--zh-rule);
  padding: 4rem 0 3rem;
  position: relative;
  overflow: hidden;
}
.zh-page-hero::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: linear-gradient(to bottom, var(--zh-spark), transparent);
}
.zh-edition-pill {
  display: inline-block;
  background: var(--zh-spark-dim);
  border: 1px solid rgba(0,200,232,.3);
  color: var(--zh-spark);
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  padding: .25rem .75rem;
  border-radius: 99px;
  margin-bottom: 1rem;
}
.zh-page-h1 {
  font-family: 'Bebas Neue', 'Barlow Condensed', sans-serif;
  font-size: clamp(2.5rem, 5vw, 4rem);
  line-height: 1;
  letter-spacing: .04em;
  color: var(--zh-text-bright);
  margin-bottom: 1rem;
}
.zh-page-desc {
  font-size: .95rem;
  color: var(--zh-text-dim);
  max-width: 520px;
  margin-bottom: 1.75rem;
}

.zh-stat-row { display: flex; gap: 2rem; flex-wrap: wrap; }
.zh-stat { text-align: left; }
.zh-stat-val {
  font-family: 'Bebas Neue', 'Barlow Condensed', sans-serif;
  font-size: 2rem;
  line-height: 1;
  color: var(--zh-spark);
  letter-spacing: .03em;
}
.zh-stat-lbl {
  font-size: .7rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--zh-text-dim);
}

/* ── DOWNLOAD BOX ──────────────────────────── */
.zh-dl-box {
  background: var(--zh-ink-3);
  border: 1px solid var(--zh-steel);
  border-left: 4px solid var(--zh-spark);
  border-radius: var(--zh-r);
  padding: 2rem 2rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  justify-content: space-between;
}
.zh-dl-box-text h4 {
  font-family: 'Bebas Neue', 'Barlow Condensed', sans-serif;
  font-size: 1.25rem;
  letter-spacing: .06em;
  color: var(--zh-text-bright);
  margin-bottom: .25rem;
}
.zh-dl-box-text p {
  font-size: .85rem;
  color: var(--zh-text-dim);
  margin: 0;
}
.zh-dl-box-actions { display: flex; gap: .75rem; flex-wrap: wrap; }

/* ── DOCS LAYOUT ───────────────────────────── */
.zh-docs-wrap {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 3rem;
  align-items: start;
  padding: 4rem 0;
}
@media (max-width: 900px) {
  .zh-docs-wrap { grid-template-columns: 1fr; }
  .zh-docs-toc   { display: none; }
}

.zh-docs-toc {
  position: sticky;
  top: 80px;
}
.zh-toc-head {
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--zh-text-dim);
  padding: 0 0 .75rem .75rem;
  border-bottom: 1px solid var(--zh-rule);
  margin-bottom: .5rem;
}
.zh-toc-list { list-style: none; padding: 0; margin: 0; }
.zh-toc-list li + li { margin-top: 2px; }
.zh-toc-list a {
  display: block;
  padding: .4rem .75rem;
  font-size: .82rem;
  color: var(--zh-text-dim);
  border-radius: var(--zh-r);
  transition: background .12s, color .12s;
  border-left: 2px solid transparent;
}
.zh-toc-list a:hover { color: var(--zh-text-bright); background: var(--zh-ink-3); }
.zh-toc-list a.active {
  color: var(--zh-spark);
  border-left-color: var(--zh-spark);
  background: var(--zh-spark-dim);
}

/* ── DOCS CONTENT ──────────────────────────── */
/*  Write plain HTML inside .zh-docs — styles cascade automatically */
.zh-docs h1 {
  font-family: 'Bebas Neue', 'Barlow Condensed', sans-serif;
  font-size: 2.2rem;
  letter-spacing: .04em;
  color: var(--zh-text-bright);
  padding-bottom: .75rem;
  border-bottom: 1px solid var(--zh-rule);
  margin-bottom: 1.5rem;
}
.zh-docs h2 {
  font-family: 'Bebas Neue', 'Barlow Condensed', sans-serif;
  font-size: 1.4rem;
  letter-spacing: .05em;
  color: var(--zh-text-bright);
  margin-top: 2.5rem;
  margin-bottom: .6rem;
  padding-left: .75rem;
  border-left: 3px solid var(--zh-steel);
}
.zh-docs h3 {
  font-size: .92rem;
  font-weight: 600;
  color: var(--zh-text);
  letter-spacing: .04em;
  text-transform: uppercase;
  margin-top: 1.75rem;
  margin-bottom: .5rem;
}
.zh-docs p {
  font-size: .92rem;
  color: var(--zh-text-dim);
  margin-bottom: 1rem;
  line-height: 1.8;
}
.zh-docs ul, .zh-docs ol {
  font-size: .92rem;
  color: var(--zh-text-dim);
  padding-left: 1.3rem;
  margin-bottom: 1rem;
  line-height: 1.8;
}
.zh-docs strong { color: var(--zh-text); font-weight: 600; }
.zh-docs a { color: var(--zh-spark); }
.zh-docs code {
  background: rgba(0,200,232,.08);
  color: var(--zh-spark);
  border: 1px solid rgba(0,200,232,.15);
  padding: .1em .4em;
  border-radius: 3px;
  font-size: .85em;
}
.zh-docs pre {
  background: var(--zh-ink-2);
  border: 1px solid var(--zh-rule);
  border-radius: var(--zh-r);
  padding: 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}
.zh-docs pre code { background: none; border: none; color: var(--zh-text); }

/* video embed */
.zh-video-block {
  margin: 1.5rem 0;
  border: 1px solid var(--zh-rule);
  border-radius: var(--zh-r);
  overflow: hidden;
  background: #000;
}
.zh-video-block video { display: block; width: 100%; }
.zh-video-caption {
  background: var(--zh-ink-2);
  padding: .5rem 1rem;
  font-size: .78rem;
  color: var(--zh-text-dim);
  border-top: 1px solid var(--zh-rule);
}

/* note callout */
.zh-note {
  background: var(--zh-ink-3);
  border-left: 3px solid var(--zh-spark);
  padding: .9rem 1.1rem;
  border-radius: 0 var(--zh-r) var(--zh-r) 0;
  margin: 1.5rem 0;
  font-size: .88rem;
  color: var(--zh-text);
}

/* ── FOOTER ────────────────────────────────── */
.zh-footer {
  background: var(--zh-ink-2);
  border-top: 1px solid var(--zh-rule);
  padding: 3.5rem 0 0;
}
.zh-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
}
@media (max-width: 768px) {
  .zh-footer-grid { grid-template-columns: 1fr 1fr; }
}
.zh-footer-tagline {
  font-size: .85rem;
  color: var(--zh-text-dim);
  margin-top: .5rem;
  max-width: 240px;
  line-height: 1.6;
}
.zh-footer-col h6 {
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--zh-steel-hi);
  margin-bottom: .9rem;
}
.zh-footer-col ul { list-style: none; padding: 0; margin: 0; }
.zh-footer-col li + li { margin-top: .4rem; }
.zh-footer-col a {
  font-size: .85rem;
  color: var(--zh-text-dim);
  transition: color .15s;
}
.zh-footer-col a:hover { color: var(--zh-text-bright); }
.zh-footer-bottom {
  margin-top: 3rem;
  border-top: 1px solid var(--zh-rule);
  padding: 1rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: .5rem;
}
.zh-footer-bottom p {
  font-size: .75rem;
  color: var(--zh-text-dim);
  margin: 0;
  opacity: .6;
}

/* ── UTILS ─────────────────────────────────── */
.zh-divider { border: none; border-top: 1px solid var(--zh-rule); margin: 2.5rem 0; }
.text-spark  { color: var(--zh-spark); }
.text-dim    { color: var(--zh-text-dim); }
.text-bright { color: var(--zh-text-bright); }

/* ── LIGHT THEME ────────────────────────────── */
html[data-theme="light"] {
  --zh-ink:         #ffffff;
  --zh-ink-2:       #f0f4f8;
  --zh-ink-3:       #e2eaf2;
  --zh-ink-4:       #cfdae8;

  --zh-spark:       #0092af;
  --zh-spark-dim:   rgba(0,146,175,.10);

  --zh-text:        #1e2a38;
  --zh-text-dim:    #4a6278;
  --zh-text-bright: #0d1117;

  --zh-rule:        rgba(29,111,164,.16);

  --bs-body-bg:     var(--zh-ink);
  --bs-body-color:  var(--zh-text);
  --bs-link-color:  var(--zh-spark);
}

html[data-theme="light"] .zh-nav {
  background: rgba(255,255,255,.92);
}

html[data-theme="light"] a:hover { color: #0d1117; }

html[data-theme="light"] .zh-docs code {
  background: rgba(0,146,175,.08);
  border-color: rgba(0,146,175,.2);
}

/* ── THEME TOGGLE ────────────────────────────── */
.zh-theme-toggle {
  background: none;
  border: 1px solid var(--zh-rule);
  color: var(--zh-text-dim);
  border-radius: var(--zh-r);
  padding: .35rem .55rem;
  cursor: pointer;
  font-size: .9rem;
  line-height: 1;
  transition: border-color .15s, color .15s, background .15s;
}
.zh-theme-toggle:hover {
  border-color: var(--zh-steel);
  color: var(--zh-text-bright);
  background: var(--zh-spark-dim);
}