/* ─── Otter Streams Docs — Shared Stylesheet ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue-primary: #0091d5;
  --blue-dark:    #006ba1;
  --blue-deeper:  #004f7c;
  --blue-pale:    #e8f4fb;
  --blue-mid:     #cce8f5;

  --ink-0: #0a0d10;
  --ink-1: #1a1f28;
  --ink-2: #2c3340;
  --ink-3: #3e4a5c;
  --ink-4: #5c6878;
  --ink-5: #8492a6;
  --ink-6: #b0bac8;

  --white:     #ffffff;
  --off-white: #f7f9fc;
  --rule:      #dde3ec;
  --rule-dark: #c8d0de;

  --green: #00875a;
  --amber: #b45309;
  --red:   #c0392b;

  --sidebar-w:  260px;
  --topbar-h:   52px;
  --content-max: 860px;

  --font-sans:  'IBM Plex Sans', system-ui, sans-serif;
  --font-mono:  'IBM Plex Mono', 'Courier New', monospace;
  --font-serif: 'IBM Plex Serif', Georgia, serif;
}

html { font-size: 15px; scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--white);
  color: var(--ink-1);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Top Bar ── */
.topbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--topbar-h);
  background: var(--ink-0);
  border-bottom: 1px solid #1e2530;
  display: flex; align-items: center;
  z-index: 1000; padding: 0 20px 0 0;
}
.topbar-brand {
  display: flex; align-items: center; gap: 12px;
  width: var(--sidebar-w); padding: 0 20px;
  border-right: 1px solid #1e2530;
  height: 100%; flex-shrink: 0; text-decoration: none;
}
.topbar-brand:hover { text-decoration: none; }
.brand-icon {
  width: 28px; height: 28px;
  background: var(--blue-primary); border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700; color: white;
  font-family: var(--font-mono); letter-spacing: -0.5px; flex-shrink: 0;
}
.brand-name { font-size: 13px; font-weight: 600; color: var(--white); letter-spacing: 0.2px; }
.brand-version {
  margin-left: auto; font-size: 10px; font-family: var(--font-mono);
  color: var(--ink-5); background: #1e2530; padding: 2px 6px; border-radius: 3px;
}
.topbar-nav { display: flex; align-items: center; gap: 2px; padding: 0 16px; flex: 1; }
.topbar-link {
  font-size: 12px; font-weight: 500; color: var(--ink-6);
  padding: 5px 10px; border-radius: 3px;
  transition: color 0.15s, background 0.15s; letter-spacing: 0.2px;
}
.topbar-link:hover { color: var(--white); background: #1e2530; text-decoration: none; }
.topbar-link.active { color: var(--white); background: #1e2530; }
.topbar-right { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.topbar-badge {
  font-size: 10px; font-family: var(--font-mono);
  color: var(--blue-primary); border: 1px solid var(--blue-dark);
  padding: 2px 8px; border-radius: 3px; letter-spacing: 0.3px;
}
.gh-link {
  display: flex; align-items: center; gap: 6px;
  font-size: 12px; color: var(--ink-5);
  padding: 5px 10px; border: 1px solid #2c3340;
  border-radius: 3px; transition: color 0.15s, border-color 0.15s;
}
.gh-link:hover { color: var(--white); border-color: var(--ink-4); text-decoration: none; }

/* ── Layout ── */
.layout { display: flex; min-height: 100vh; padding-top: var(--topbar-h); }

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-w); flex-shrink: 0;
  position: fixed; top: var(--topbar-h); bottom: 0; left: 0;
  overflow-y: auto; background: var(--off-white);
  border-right: 1px solid var(--rule);
  padding: 24px 0 40px;
  scrollbar-width: thin; scrollbar-color: var(--rule-dark) transparent;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--rule-dark); border-radius: 2px; }

.nav-section { margin-bottom: 26px; }
.nav-section-title {
  font-size: 10px; font-weight: 600; letter-spacing: 1.2px;
  text-transform: uppercase; color: var(--ink-5);
  padding: 0 20px; margin-bottom: 5px; font-family: var(--font-mono);
}
.nav-item {
  display: block; font-size: 12.5px; color: var(--ink-3);
  padding: 5px 20px; border-left: 2px solid transparent;
  transition: color 0.12s, border-color 0.12s, background 0.12s;
  font-weight: 400; line-height: 1.5;
}
.nav-item:hover { color: var(--blue-primary); background: var(--blue-mid); border-left-color: var(--blue-mid); text-decoration: none; }
.nav-item.active { color: var(--blue-primary); background: var(--blue-pale); border-left-color: var(--blue-primary); font-weight: 500; }
.nav-sub { padding-left: 32px; font-size: 12px; color: var(--ink-4); }
.nav-divider { height: 1px; background: var(--rule); margin: 14px 20px; }

/* ── Main ── */
.main { margin-left: var(--sidebar-w); flex: 1; min-width: 0; }

/* ── Page Header ── */
.page-header {
  background: linear-gradient(160deg, var(--ink-0) 0%, var(--ink-2) 100%);
  border-bottom: 1px solid #1e2530;
  padding: 56px 80px 48px; position: relative; overflow: hidden;
}
.page-header::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 80% at 90% 40%, rgba(0,145,213,0.12) 0%, transparent 60%),
              radial-gradient(ellipse 40% 60% at 10% 80%, rgba(0,107,161,0.08) 0%, transparent 50%);
  pointer-events: none;
}
.header-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 10px; font-family: var(--font-mono);
  color: var(--blue-primary); border: 1px solid rgba(0,145,213,0.4);
  padding: 3px 10px; border-radius: 2px; margin-bottom: 18px;
  letter-spacing: 0.8px; text-transform: uppercase; position: relative;
}
.header-dot {
  width: 5px; height: 5px; background: var(--blue-primary);
  border-radius: 50%; animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.4} }
.page-header h1 {
  font-family: var(--font-serif); font-size: 32px; font-weight: 500;
  color: var(--white); line-height: 1.2; margin-bottom: 14px;
  max-width: 640px; position: relative;
}
.page-header .lead {
  font-size: 14.5px; color: var(--ink-6); max-width: 580px;
  line-height: 1.75; font-weight: 300; position: relative;
}
.header-meta { display: flex; align-items: center; gap: 12px; margin-top: 28px; position: relative; flex-wrap: wrap; }
.meta-pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; font-family: var(--font-mono);
  color: var(--ink-5); background: rgba(255,255,255,0.05);
  border: 1px solid #2c3340; padding: 4px 10px; border-radius: 3px;
}
.meta-pill-val { color: var(--ink-6); }

/* ── Breadcrumb ── */
.breadcrumb {
  display: flex; align-items: center; gap: 6px;
  font-size: 11.5px; color: var(--ink-5);
  padding: 10px 80px; border-bottom: 1px solid var(--rule); background: var(--white);
}
.breadcrumb a { color: var(--ink-5); }
.breadcrumb a:hover { color: var(--blue-primary); text-decoration: none; }
.breadcrumb-sep { color: var(--rule-dark); }
.breadcrumb-current { color: var(--ink-3); }

/* ── Content Body ── */
.content-body {
  max-width: var(--content-max);
  padding: 48px 80px 80px;
}
.content-body h2 {
  font-family: var(--font-serif); font-size: 21px; font-weight: 500;
  color: var(--ink-0); margin: 48px 0 14px;
  padding-top: 48px; border-top: 1px solid var(--rule);
  scroll-margin-top: 80px; line-height: 1.3;
}
.content-body h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.content-body h3 {
  font-size: 11px; font-weight: 600; color: var(--ink-4);
  margin: 28px 0 10px; text-transform: uppercase;
  letter-spacing: 1px; font-family: var(--font-mono);
}
.content-body h4 { font-size: 13px; font-weight: 600; color: var(--ink-2); margin: 18px 0 8px; }
.content-body p { font-size: 14px; color: var(--ink-2); line-height: 1.8; margin-bottom: 14px; }
.content-body strong { color: var(--ink-0); font-weight: 600; }
.content-body hr { border: none; border-top: 1px solid var(--rule); margin: 40px 0; }
.content-body ul, .content-body ol { padding-left: 20px; margin: 10px 0 16px; }
.content-body li { font-size: 13.5px; color: var(--ink-2); line-height: 1.75; margin-bottom: 5px; }
.content-body li code { font-size: 11.5px; }
.content-body code {
  font-family: var(--font-mono); font-size: 12px;
  background: var(--off-white); border: 1px solid var(--rule);
  color: var(--ink-1); padding: 1px 5px; border-radius: 3px;
}

/* ── Code Block ── */
.code-block {
  margin: 18px 0 22px; border: 1px solid var(--rule);
  border-radius: 4px; overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.code-block-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 7px 14px; background: var(--ink-1); border-bottom: 1px solid var(--ink-2);
  gap: 10px;
}
.code-lang { font-size: 10px; font-family: var(--font-mono); color: var(--ink-5); letter-spacing: 0.8px; text-transform: uppercase; }
.code-filename { font-size: 11px; font-family: var(--font-mono); color: var(--ink-5); flex: 1; }
.copy-btn {
  font-size: 10px; font-family: var(--font-mono); color: var(--ink-5);
  background: transparent; border: 1px solid var(--ink-2);
  padding: 2px 8px; border-radius: 2px; cursor: pointer;
  letter-spacing: 0.4px; transition: color 0.15s, border-color 0.15s;
}
.copy-btn:hover { color: var(--white); border-color: var(--ink-4); }
.copy-btn.ok { color: var(--green); border-color: var(--green); }
.code-block pre {
  background: var(--ink-0); padding: 16px 20px;
  overflow-x: auto; margin: 0;
  font-size: 12.5px; font-family: var(--font-mono);
  line-height: 1.65; color: #c9d1d9;
}
.code-block pre .cm { color: #6e7681; }
.code-block pre .kw { color: #79c0ff; }
.code-block pre .st { color: #a5d6ff; }

/* ── Callout ── */
.callout {
  display: flex; gap: 14px; padding: 13px 18px;
  border-radius: 3px; margin: 18px 0;
  border: 1px solid; font-size: 13px; line-height: 1.7;
}
.callout-note   { background: #eff8ff; border-color: #bee3f8; color: var(--ink-2); }
.callout-warn   { background: #fffbeb; border-color: #fde68a; color: #78350f; }
.callout-info   { background: var(--blue-pale); border-color: var(--blue-mid); color: var(--blue-deeper); }
.callout-danger { background: #fff5f5; border-color: #feb2b2; color: #742a2a; }
.callout-icon   { font-size: 14px; flex-shrink: 0; margin-top: 1px; font-style: normal; }
.callout p { font-size: 13px; margin-bottom: 0; color: inherit; }
.callout strong { color: inherit; }

/* ── Tables ── */
.table-wrap { overflow-x: auto; margin: 16px 0 22px; border: 1px solid var(--rule); border-radius: 4px; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
thead { background: var(--off-white); border-bottom: 1px solid var(--rule); }
th {
  font-size: 10px; font-weight: 600; font-family: var(--font-mono);
  text-transform: uppercase; letter-spacing: 0.8px;
  color: var(--ink-4); padding: 9px 14px; text-align: left; white-space: nowrap;
}
td { padding: 9px 14px; color: var(--ink-2); border-bottom: 1px solid var(--rule); vertical-align: top; }
td code { font-size: 11.5px; }
tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--off-white); }

/* ── Artifact Table ── */
.artifact-table { margin: 16px 0 22px; border: 1px solid var(--rule); border-radius: 4px; overflow: hidden; }
.artifact-row { display: grid; grid-template-columns: 160px 1fr; border-bottom: 1px solid var(--rule); }
.artifact-row:last-child { border-bottom: none; }
.artifact-key {
  font-size: 11px; font-family: var(--font-mono); font-weight: 500;
  color: var(--ink-4); background: var(--off-white);
  padding: 10px 14px; display: flex; align-items: center; letter-spacing: 0.3px;
}
.artifact-val {
  font-size: 12.5px; font-family: var(--font-mono);
  color: var(--ink-1); padding: 10px 14px; display: flex; align-items: center; word-break: break-all;
}

/* ── Steps ── */
.steps { margin: 18px 0 22px; }
.step { display: flex; gap: 20px; padding: 0 0 26px; position: relative; }
.step::before {
  content: ''; position: absolute; left: 15px;
  top: 34px; bottom: 0; width: 1px; background: var(--rule);
}
.step:last-child::before { display: none; }
.step:last-child { padding-bottom: 0; }
.step-num {
  width: 32px; height: 32px; background: var(--blue-primary); color: white;
  font-size: 12px; font-weight: 600; font-family: var(--font-mono);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; position: relative; z-index: 1;
}
.step-body { flex: 1; padding-top: 5px; }
.step-title { font-size: 14px; font-weight: 600; color: var(--ink-1); margin-bottom: 8px; }
.step-body p { font-size: 13px; color: var(--ink-3); margin-bottom: 10px; }

/* ── Grid Cards ── */
.card-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px; margin: 16px 0 22px;
}
.card {
  border: 1px solid var(--rule); border-radius: 4px;
  padding: 18px 20px; background: var(--off-white);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.card:hover { border-color: var(--blue-primary); box-shadow: 0 2px 8px rgba(0,145,213,0.08); }
.card-title { font-size: 13px; font-weight: 600; color: var(--ink-1); margin-bottom: 6px; }
.card-desc { font-size: 12px; color: var(--ink-4); line-height: 1.65; }
.card a { color: var(--blue-primary); font-size: 12px; }

/* ── Module Cards ── */
.module-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(195px, 1fr)); gap: 10px; margin: 16px 0 22px; }
.module-card { border: 1px solid var(--rule); border-radius: 4px; padding: 15px 17px; background: var(--white); transition: border-color 0.15s; }
.module-card:hover { border-color: var(--blue-primary); }
.module-card-name { font-size: 12px; font-family: var(--font-mono); font-weight: 500; color: var(--ink-1); margin-bottom: 5px; }
.module-card-tag {
  display: inline-block; font-size: 10px; font-family: var(--font-mono);
  color: var(--blue-primary); background: var(--blue-pale);
  padding: 1px 6px; border-radius: 2px; margin-bottom: 7px; letter-spacing: 0.3px;
}
.module-card-desc { font-size: 11.5px; color: var(--ink-4); line-height: 1.6; }

/* ── Tags ── */
.tag {
  display: inline-block; font-size: 10px; font-family: var(--font-mono);
  padding: 1px 6px; border-radius: 2px; letter-spacing: 0.3px; vertical-align: middle;
}
.tag-blue   { background: var(--blue-pale);  color: var(--blue-deeper); border: 1px solid var(--blue-mid); }
.tag-green  { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.tag-amber  { background: #fffbeb; color: #78350f; border: 1px solid #fde68a; }
.tag-red    { background: #fff5f5; color: #742a2a; border: 1px solid #feb2b2; }
.tag-grey   { background: var(--off-white); color: var(--ink-4); border: 1px solid var(--rule); }

/* ── Trace ── */
.trace-block {
  background: #fef2f2; border: 1px solid #fecaca; border-radius: 4px;
  padding: 14px 18px; font-family: var(--font-mono); font-size: 11px;
  line-height: 1.8; color: #7f1d1d; overflow-x: auto; margin: 14px 0;
}
.trace-highlight { background: #fee2e2; padding: 2px 6px; border-radius: 2px; color: #991b1b; font-weight: 500; }

/* ── TOC ── */
.toc {
  float: right; width: 195px; margin: 0 0 24px 40px;
  padding: 13px 17px; background: var(--off-white);
  border: 1px solid var(--rule); border-radius: 4px; font-size: 12px;
}
.toc-title { font-size: 10px; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 1px; color: var(--ink-5); margin-bottom: 10px; }
.toc-list { list-style: none; }
.toc-list li { margin-bottom: 6px; }
.toc-list a { color: var(--ink-4); font-size: 12px; display: block; line-height: 1.4; transition: color 0.12s; }
.toc-list a:hover { color: var(--blue-primary); text-decoration: none; }
.toc-list .toc-sub { padding-left: 12px; font-size: 11px; }

/* ── Footer ── */
.doc-footer {
  border-top: 1px solid var(--rule); padding: 28px 80px;
  display: flex; align-items: center; justify-content: space-between;
  font-size: 12px; color: var(--ink-5); background: var(--off-white); flex-wrap: wrap; gap: 12px;
}
.footer-links { display: flex; gap: 16px; }
.footer-links a { color: var(--ink-4); }
.footer-links a:hover { color: var(--blue-primary); text-decoration: none; }

/* ── Clearfix ── */
.cf::after { content: ''; display: table; clear: both; }

/* ── Responsive ── */
@media (max-width: 900px) {
  .sidebar { display: none; }
  .main { margin-left: 0; }
  .page-header, .content-body, .breadcrumb, .doc-footer { padding-left: 24px; padding-right: 24px; }
  .toc { float: none; width: 100%; margin: 0 0 24px; }
}