:root {
  --accent: #0f766e;
  --accent-hover: #0d9488;
  --accent-soft: rgba(15, 118, 110, 0.1);
  --text: #3b3c4a;
  --heading: #1c1c1c;
  --muted: #67788a;
  --border: #e4e8ee;
  --border-strong: #d0d7de;
  --bg: #ffffff;
  --tint: #f7f8fa;
  --sidebar: #f5f6f8;
  --code-bg: #f4f6f8;
  --code-fg: #334155;
  --pre-bg: #1b1f24;
  --pre-fg: #e6edf3;
  --info-bg: #eef6ff;
  --info-border: #3b82f6;
  --warn-bg: #fff8eb;
  --warn-border: #eab308;
  --success-bg: #eefaf4;
  --success-border: #10b981;
  --danger-bg: #fef2f2;
  --danger-border: #ef4444;
  --header-h: 64px;
  --chrome-h: 108px;
  --sidebar-w: 272px;
  --outline-w: 220px;
  --content-w: 720px;
  --radius: 8px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04);
  --font: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
img { max-width: 100%; height: auto; }

.app {
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

/* Pinned contact banner + header */
.chrome {
  position: sticky;
  top: 0;
  z-index: 40;
  flex-shrink: 0;
  background: var(--bg);
}
.pin-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  padding: 8px 16px;
  background: #0f766e;
  color: #fff;
  text-align: center;
}
.pin-banner p {
  margin: 0;
  font-size: 13.5px;
  font-weight: 550;
  line-height: 1.45;
}
.pin-banner a {
  color: #fff;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1.5px;
}
.pin-banner a:hover { color: #ccfbf1; }
.pin-sep {
  margin: 0 8px;
  opacity: .55;
  font-weight: 400;
}
.header {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 16px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: calc(var(--sidebar-w) - 16px);
  color: inherit;
  text-decoration: none;
  flex-shrink: 0;
}
.header-brand:hover { text-decoration: none; }
.logo {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: linear-gradient(145deg, #134e4a, var(--accent));
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 13px;
}
.header-brand strong {
  font-size: 15px;
  font-weight: 650;
  color: var(--heading);
}
.header-search {
  flex: 1;
  max-width: 420px;
  position: relative;
}
.header-search input {
  width: 100%;
  height: 38px;
  border: 1px solid var(--border);
  background: var(--tint);
  border-radius: 8px;
  padding: 0 12px 0 36px;
  font: inherit;
  font-size: 14px;
  color: var(--heading);
  outline: none;
}
.header-search input:focus {
  background: #fff;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.header-search svg {
  position: absolute;
  left: 11px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
}
.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}
.header-link {
  font-size: 14px;
  font-weight: 550;
  color: var(--text);
  padding: 8px 10px;
  border-radius: 8px;
}
.header-link:hover { background: var(--tint); text-decoration: none; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 14px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff !important;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none !important;
}
.btn-primary:hover { background: var(--accent-hover); }
.menu-btn {
  display: none;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 8px;
  width: 38px;
  height: 38px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  color: var(--heading);
}

/* Body */
.body {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr) var(--outline-w);
  flex: 1;
  min-height: 0;
}

/* Sidebar */
.sidebar {
  position: sticky;
  top: var(--chrome-h);
  height: calc(100vh - var(--chrome-h));
  overflow: auto;
  background: var(--sidebar);
  border-right: 1px solid var(--border);
  padding: 16px 12px 40px;
}
.nav-group { margin-bottom: 4px; }
.nav-group-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: 0;
  padding: 8px 10px;
  font: inherit;
  font-size: 13px;
  font-weight: 650;
  color: var(--heading);
  cursor: pointer;
  border-radius: 8px;
  text-align: left;
}
.nav-group-toggle:hover { background: rgba(0,0,0,.04); }
.nav-group-toggle .chev {
  width: 16px;
  height: 16px;
  color: var(--muted);
  transition: transform .15s ease;
  flex: 0 0 auto;
}
.nav-group.collapsed .chev { transform: rotate(-90deg); }
.nav-group.collapsed .nav-pages { display: none; }
.nav-pages { padding: 0 0 8px 8px; }
.sidebar a.nav-link {
  display: block;
  padding: 6px 10px;
  margin: 1px 0;
  border-radius: 7px;
  color: var(--text);
  font-size: 13.5px;
  font-weight: 450;
  line-height: 1.4;
  text-decoration: none;
}
.sidebar a.nav-link:hover { background: rgba(0,0,0,.045); }
.sidebar a.nav-link.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}
.sidebar a.nav-link.hidden { display: none; }

/* Main */
.main {
  min-width: 0;
  padding: 36px 48px 80px;
}
.page { display: none; max-width: var(--content-w); }
.page.active { display: block; }
.crumb {
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 12px;
}
.page-title {
  font-size: 32px;
  line-height: 1.2;
  letter-spacing: -.025em;
  color: var(--heading);
  margin: 0 0 8px;
  font-weight: 700;
}
.page-desc {
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 16.5px;
}
.page h2 {
  font-size: 22px;
  line-height: 1.3;
  color: var(--heading);
  margin: 36px 0 12px;
  letter-spacing: -.02em;
  scroll-margin-top: 84px;
}
.page h3 {
  font-size: 17px;
  color: var(--heading);
  margin: 28px 0 10px;
  scroll-margin-top: 84px;
}
.page p { margin: 0 0 14px; }
.page ul, .page ol { margin: 0 0 16px; padding-left: 1.25rem; }
.page li { margin: 0 0 6px; }
.page li::marker { color: var(--accent); }
.page strong { color: var(--heading); font-weight: 600; }
.page hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 28px 0;
}

code {
  font-family: var(--font-mono);
  font-size: .84em;
  background: var(--code-bg);
  color: var(--code-fg);
  padding: .12rem .38rem;
  border-radius: 5px;
  border: 1px solid var(--border);
}
pre {
  background: var(--pre-bg);
  color: var(--pre-fg);
  padding: 14px 16px;
  border-radius: 10px;
  overflow-x: auto;
  margin: 0 0 18px;
  font-size: 13px;
  line-height: 1.55;
}
pre code {
  background: none;
  border: 0;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

.hint {
  display: flex;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 10px;
  margin: 16px 0 20px;
  border: 1px solid transparent;
  background: var(--info-bg);
  border-left: 3px solid var(--info-border);
}
.hint.warn { background: var(--warn-bg); border-left-color: var(--warn-border); }
.hint.success { background: var(--success-bg); border-left-color: var(--success-border); }
.hint.danger { background: var(--danger-bg); border-left-color: var(--danger-border); }
.hint .hint-icon { flex: 0 0 auto; margin-top: 2px; }
.hint p { margin: 0; }
.hint p + p { margin-top: 8px; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 20px;
  font-size: 14.5px;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
th {
  background: var(--tint);
  color: var(--heading);
  font-size: 12.5px;
  font-weight: 650;
}
tr:last-child td { border-bottom: 0; }

.hero-shot {
  display: block;
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  margin: 8px 0 24px;
  box-shadow: var(--shadow);
}
.shot-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 8px 0 22px;
}
.shot-grid figure { margin: 0; }
.shot-grid img {
  width: 100%;
  display: block;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0f1720;
}
.shot-grid figcaption {
  margin-top: 6px;
  font-size: 12.5px;
  color: var(--muted);
}

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 8px 0 24px;
}
.card {
  display: block;
  padding: 16px 16px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  color: inherit;
  text-decoration: none !important;
  box-shadow: var(--shadow);
}
.card:hover { border-color: var(--accent); }
.card strong {
  display: block;
  color: var(--heading);
  margin-bottom: 4px;
  font-size: 15px;
}
.card span { display: block; color: var(--muted); font-size: 13.5px; line-height: 1.5; }

.steps { counter-reset: step; margin: 8px 0 20px; }
.step {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.step:last-child { border-bottom: 0; }
.step::before {
  counter-increment: step;
  content: counter(step);
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 700;
  margin-top: 2px;
}
.step h4 { margin: 0 0 4px; font-size: 15px; color: var(--heading); }
.step p { margin: 0; font-size: 14.5px; }

.flow {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: stretch;
  margin: 8px 0 22px;
}
.flow-item {
  flex: 1;
  min-width: 120px;
  background: var(--tint);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  font-size: 13.5px;
}
.flow-item strong { display: block; color: var(--heading); margin-bottom: 2px; }
.flow-arrow {
  display: flex;
  align-items: center;
  color: var(--muted);
  font-weight: 700;
}

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  max-width: var(--content-w);
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.pager a {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: inherit;
  text-decoration: none !important;
}
.pager a:hover { border-color: var(--accent); }
.pager .next { text-align: right; }
.pager small { display: block; color: var(--muted); font-size: 12px; margin-bottom: 2px; }
.pager strong { color: var(--heading); font-size: 14.5px; }
.pager a.disabled { visibility: hidden; }

/* Outline */
.outline {
  position: sticky;
  top: var(--chrome-h);
  height: calc(100vh - var(--chrome-h));
  overflow: auto;
  padding: 28px 18px 40px 8px;
  border-left: 1px solid var(--border);
}
.outline h4 {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 650;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .04em;
}
.outline a {
  display: block;
  font-size: 13px;
  color: var(--muted);
  padding: 4px 0 4px 10px;
  border-left: 2px solid transparent;
  text-decoration: none;
  line-height: 1.4;
}
.outline a:hover { color: var(--heading); }
.outline a.h3 { padding-left: 20px; }
.outline a.active {
  color: var(--accent);
  border-left-color: var(--accent);
}

.search-empty {
  display: none;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--muted);
}

.backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(16, 24, 40, .35);
  z-index: 25;
}

@media (max-width: 1100px) {
  .body { grid-template-columns: var(--sidebar-w) minmax(0, 1fr); }
  .outline { display: none; }
}
@media (max-width: 860px) {
  .body { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: min(86vw, 300px);
    z-index: 30;
    transform: translateX(-105%);
    transition: transform .2s ease;
    background: #fff;
  }
  body.nav-open .sidebar { transform: translateX(0); }
  body.nav-open .backdrop { display: block; }
  .menu-btn { display: inline-flex; }
  .header-brand { min-width: 0; }
  .header-search { display: block; flex: 1; max-width: none; }
  .header-actions .header-link { display: none; }
  .header-actions .btn-primary { display: none; }
  .pin-banner p { font-size: 12.5px; }
  .main { padding: 24px 18px 64px; }
  .cards, .shot-grid, .pager { grid-template-columns: 1fr; }
  .page-title { font-size: 26px; }
}