/* ============================================================
   Design system — Flamingo content product
   ============================================================ */

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img { max-width: 100%; height: auto; display: block; }

/* ---- Tokens ---- */
:root {
  /* Color */
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-code: #f1f5f9;
  --bg-card: #ffffff;            /* card surface — same as --bg in light, slightly raised in dark */
  --text: #0f172a;
  --text-muted: #475569;
  --text-soft: #64748b;
  --muted: #64748b;              /* alias for --text-soft (older inline styles reference --muted) */
  --border: #e2e8f0;
  --border-strong: #cbd5e1;

  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-soft: #dbeafe;

  --warn: #f59e0b;
  --warn-bg: #fef3c7;
  --warn-text: #78350f;

  --danger: #dc2626;
  --danger-bg: #fee2e2;
  --danger-text: #7f1d1d;

  --success: #16a34a;
  --success-bg: #dcfce7;
  --success-text: #14532d;

  --purple: #7c3aed;
  --purple-bg: #ede9fe;
  --purple-text: #4c1d95;

  /* Spacing */
  --pad: 1rem;
  --gap: 1.5rem;
  --container: 90vw;     /* fills 90% of viewport → 5% gutter on each side */
  --content: 860px;      /* reading column max — still within optimal line-length */
  --sidebar: 280px;

  /* Typography */
  --font: -apple-system, "Inter", "Segoe UI", "Helvetica Neue", system-ui, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;

  /* Shadow / radius */
  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.08);
}

/* ---- Dark mode ---- */
[data-theme="dark"] {
  --bg: #0b1220;
  --bg-alt: #111827;
  --bg-code: #1e293b;
  --bg-card: #111827;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-soft: #94a3b8;
  --muted: #94a3b8;
  --border: #1e293b;
  --border-strong: #334155;

  --accent: #60a5fa;
  --accent-hover: #93c5fd;
  --accent-soft: rgba(96, 165, 250, 0.15);

  --warn: #fbbf24;
  --warn-bg: rgba(251, 191, 36, 0.12);
  --warn-text: #fde68a;

  --danger: #f87171;
  --danger-bg: rgba(248, 113, 113, 0.12);
  --danger-text: #fecaca;

  --success: #4ade80;
  --success-bg: rgba(74, 222, 128, 0.12);
  --success-text: #bbf7d0;

  --purple: #a78bfa;
  --purple-bg: rgba(167, 139, 250, 0.15);
  --purple-text: #ddd6fe;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.6);

  color-scheme: dark;
}
[data-theme="dark"] .topbar { background: rgba(11, 18, 32, 0.85); }

/* ---- Base ---- */
body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Top nav ---- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0.85rem 0.5rem;
  display: flex; align-items: center; gap: 1.5rem;
}
.brand {
  font-weight: 800; font-size: 1.05rem; color: var(--text);
  display: flex; align-items: center; gap: 0.5rem;
}
.brand-dot {
  display: inline-block; width: 10px; height: 10px;
  background: var(--accent); border-radius: 50%;
}
.nav-links { display: flex; gap: 1.25rem; margin-left: auto; }
.nav-links a {
  color: var(--text-muted); font-size: 0.92rem; font-weight: 500;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a.active { color: var(--accent); font-weight: 600; }
.btn-primary {
  background: var(--accent); color: white !important; padding: 0.5rem 1rem;
  border-radius: 8px; font-weight: 600; font-size: 0.92rem;
}
.btn-primary:hover { background: var(--accent-hover); text-decoration: none !important; }

/* ---- Containers ---- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 0.5rem; }
.content-narrow { max-width: var(--content); margin: 0 auto; }

/* ---- Hero (landing) ---- */
.hero {
  padding: 5rem 0.5rem 4rem;
  text-align: center;
  background:
    radial-gradient(circle at 20% 0%, var(--accent-soft) 0%, transparent 50%),
    radial-gradient(circle at 80% 100%, var(--warn-bg) 0%, transparent 50%);
}
.hero h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 1.25rem;
  line-height: 1.1;
}
.hero h1 .accent { color: var(--accent); }
.hero p.lead {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 2rem;
}
.hero-cta { display: inline-flex; gap: 0.75rem; }
.btn-large {
  font-size: 1rem; padding: 0.85rem 1.75rem;
  background: var(--accent); color: white;
  border-radius: 10px; font-weight: 700;
  display: inline-block;
}
.btn-large:hover { background: var(--accent-hover); text-decoration: none; color: white; }
.btn-secondary {
  background: transparent; color: var(--text);
  border: 1.5px solid var(--border-strong);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

/* ---- Section ---- */
section.block { padding: 4rem 0.5rem; }
section.block.alt { background: var(--bg-alt); }
.section-head {
  text-align: center; max-width: 720px; margin: 0 auto 3rem;
}
.section-eyebrow {
  text-transform: uppercase; font-size: 0.78rem; font-weight: 700;
  color: var(--accent); letter-spacing: 0.08em;
}
.section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  margin: 0.5rem 0 1rem; font-weight: 800;
  letter-spacing: -0.01em;
}
.section-head p { color: var(--text-muted); font-size: 1.05rem; }

/* ---- Track cards (landing) ---- */
.tracks { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; max-width: 1100px; margin: 0 auto; }
.tracks-3 { grid-template-columns: 1fr 1fr 1fr; max-width: 1400px; }
@media (max-width: 1000px) { .tracks-3 { grid-template-columns: 1fr; } }
.track-card {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 2rem; box-shadow: var(--shadow-sm);
  transition: all 0.2s;
}
.track-card:hover { box-shadow: var(--shadow-md); border-color: var(--border-strong); }
.track-badge {
  display: inline-block; font-size: 0.78rem; font-weight: 700;
  padding: 0.25rem 0.6rem; border-radius: 999px;
  margin-bottom: 1rem;
}
.track-badge.hld { background: var(--accent-soft); color: var(--accent); }
.track-badge.lld { background: var(--purple-bg); color: var(--purple-text); }
.track-badge.examples { background: var(--warn-bg); color: var(--warn-text); }
.track-card h3 {
  font-size: 1.5rem; margin: 0 0 0.5rem; font-weight: 700;
}
.track-card p.desc {
  color: var(--text-muted); margin: 0 0 1.25rem;
}
.track-meta {
  display: flex; gap: 1.5rem; font-size: 0.85rem; color: var(--text-soft);
  margin-bottom: 1.5rem;
}
.track-meta strong { color: var(--text); font-weight: 700; }
.track-cta {
  color: var(--accent); font-weight: 600; font-size: 0.95rem;
  display: inline-flex; align-items: center; gap: 0.35rem;
}
.track-cta::after { content: "→"; transition: transform 0.2s; }
.track-cta:hover::after { transform: translateX(3px); }
@media (max-width: 720px) { .tracks { grid-template-columns: 1fr; } }

/* ---- Library / chapter index ---- */
.library-hero {
  padding: 3rem 0.5rem 2rem;
  border-bottom: 1px solid var(--border);
}
.library-hero h1 { font-size: 2rem; margin: 0 0 0.5rem; font-weight: 800; }
.library-hero .library-tagline { color: var(--text-muted); margin: 0; font-size: 1.05rem; }
.library-intro {
  margin-top: 1.5rem;
  color: var(--text);
  font-size: 1rem;
  line-height: 1.65;
}
.library-intro p { margin: 0.5rem 0; }
.library-intro .note,
.library-intro .war,
.library-intro .qa,
.library-intro .analogy,
.library-intro .pattern,
.library-intro .reading {
  border-left: 4px solid;
  padding: 0.75rem 1rem;
  margin: 1rem 0;
  border-radius: 0 8px 8px 0;
  font-size: 0.95rem;
}
.library-intro .note    { background: var(--warn-bg);    border-color: var(--warn); }
.library-intro .war     { background: var(--danger-bg);  border-color: var(--danger); }
.library-intro .qa      { background: var(--success-bg); border-color: var(--success); }
.library-intro .analogy,
.library-intro .pattern { background: var(--purple-bg);  border-color: var(--purple); }
.library-intro .reading { background: var(--accent-soft); border-color: var(--accent); }
.chapter-list {
  max-width: var(--container);
  margin: 0 auto;
  padding: 2.5rem 0.5rem 5rem;
}
.library-group-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-soft);
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.library-group-label:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.library-group { margin-bottom: 1rem; }
.chapter-row {
  display: flex; gap: 1.5rem; align-items: center;
  padding: 1.25rem; border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 0.75rem;
  background: var(--bg);
  transition: all 0.15s;
}
.chapter-row:hover {
  border-color: var(--accent);
  background: var(--bg-alt);
  text-decoration: none;
}
.chapter-num {
  flex-shrink: 0; width: 48px; height: 48px;
  background: var(--accent-soft); color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1.05rem;
  border-radius: 10px;
}
.chapter-info { flex: 1; min-width: 0; }
.chapter-title {
  font-size: 1.05rem; font-weight: 700; color: var(--text);
  margin: 0 0 0.2rem;
}
.chapter-meta {
  font-size: 0.85rem; color: var(--text-soft);
  display: flex; gap: 0.75rem; flex-wrap: wrap;
}
.chapter-meta .dot { color: var(--border-strong); }
.chapter-arrow { color: var(--text-soft); flex-shrink: 0; font-size: 1.3rem; }

/* ---- Chapter reading page ---- */
.chapter-layout {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: var(--sidebar) 1fr;
  gap: 3rem;
  padding: 2.5rem 0.5rem 5rem;
}
.chapter-sidebar {
  position: sticky; top: 80px;
  align-self: start;
  font-size: 0.92rem;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}
.chapter-sidebar h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-soft);
  margin: 0 0 0.5rem;
  font-weight: 700;
}
.chapter-sidebar ol {
  margin: 0; padding-left: 2rem;
  color: var(--text-muted);
}
.chapter-sidebar li { margin-bottom: 0.35rem; line-height: 1.4; }
.chapter-sidebar a { color: var(--text-muted); }
.chapter-sidebar a:hover { color: var(--accent); text-decoration: none; }

.chapter-main { min-width: 0; max-width: var(--content); }
.chapter-eyebrow {
  font-size: 0.85rem; color: var(--accent); font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}
.chapter-main h1 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin: 0 0 1rem;
}
.chapter-meta-bar {
  display: flex; gap: 1.25rem; font-size: 0.88rem;
  color: var(--text-soft);
  padding-bottom: 1.25rem; margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}
.chapter-main h2 {
  font-size: 1.6rem; font-weight: 800;
  margin: 2.5rem 0 1rem;
  letter-spacing: -0.01em;
  scroll-margin-top: 90px;
}
.chapter-main h3 {
  font-size: 1.25rem; font-weight: 700;
  margin: 2rem 0 0.5rem;
  scroll-margin-top: 90px;
}
.chapter-main h4 {
  font-size: 1.05rem; font-weight: 700;
  margin: 1.5rem 0 0.5rem;
}
.chapter-main p { margin: 0.75rem 0; }
.chapter-main strong { color: var(--text); font-weight: 700; }

.chapter-main pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  margin: 1rem 0;
  white-space: pre-wrap;
}
.chapter-main code {
  background: var(--bg-code);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
}
.chapter-main pre code { background: none; padding: 0; }

.chapter-main table {
  width: 100%; border-collapse: collapse; margin: 1.25rem 0;
  font-size: 0.92rem;
}
.chapter-main th, .chapter-main td {
  border: 1px solid var(--border);
  padding: 0.6rem 0.85rem;
  text-align: left; vertical-align: top;
}
.chapter-main th { background: var(--bg-alt); font-weight: 700; }
.chapter-main tr:nth-child(even) td { background: var(--bg-alt); }

.chapter-main blockquote {
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  margin: 1rem 0;
  padding: 0.85rem 1.25rem;
  border-radius: 0 8px 8px 0;
  color: var(--text);
}

.chapter-main ul, .chapter-main ol { margin: 0.5rem 0 1rem; padding-left: 1.5rem; }
.chapter-main li { margin-bottom: 0.35rem; }

/* Callouts */
.callout { border-left: 4px solid; padding: 0.85rem 1.25rem; margin: 1.25rem 0; border-radius: 0 8px 8px 0; }
.callout-title { font-weight: 700; margin-bottom: 0.35rem; }
.callout.note { background: var(--warn-bg); border-color: var(--warn); }
.callout.note .callout-title { color: var(--warn-text); }
.callout.war { background: var(--danger-bg); border-color: var(--danger); }
.callout.war .callout-title { color: var(--danger-text); }
.callout.qa { background: var(--success-bg); border-color: var(--success); }
.callout.qa .callout-title { color: var(--success-text); }
.callout.pattern { background: var(--purple-bg); border-color: var(--purple); }
.callout.pattern .callout-title { color: var(--purple-text); }
.callout.reading { background: var(--accent-soft); border-color: var(--accent); }

/* Bare-class callouts inherited from the monolith source — kept compatible
   so extracted chapter HTML renders without rewriting class names. */
.chapter-main .note,
.chapter-main .war,
.chapter-main .qa,
.chapter-main .analogy,
.chapter-main .pattern,
.chapter-main .reading {
  border-left: 4px solid;
  padding: 0.85rem 1.25rem;
  margin: 1.25rem 0;
  border-radius: 0 8px 8px 0;
}
.chapter-main .note    { background: var(--warn-bg);     border-color: var(--warn); }
.chapter-main .war     { background: var(--danger-bg);   border-color: var(--danger); }
.chapter-main .qa      { background: var(--success-bg);  border-color: var(--success); }
.chapter-main .analogy { background: var(--purple-bg);   border-color: var(--purple); }
.chapter-main .pattern { background: var(--purple-bg);   border-color: var(--purple); }
.chapter-main .reading { background: var(--accent-soft); border-color: var(--accent); }

/* Interview-drill sub-components from the monolith */
.chapter-main .qa-q {
  font-weight: 700;
  color: var(--success-text);
  margin-top: 0.6rem;
}
.chapter-main .qa-q:first-child { margin-top: 0; }
.chapter-main .qa-a {
  margin-top: 0.25rem;
}
.chapter-main .qa-cross {
  background: rgba(22, 163, 74, 0.08);
  padding: 0.5rem 0.85rem;
  margin-top: 0.5rem;
  border-left: 2px solid var(--success);
  border-radius: 4px;
  font-size: 0.92rem;
}
.chapter-main .qa-cross b { color: var(--success-text); }
.chapter-main .reading-title,
.chapter-main .note-title,
.chapter-main .war-title,
.chapter-main .pattern-title,
.chapter-main .analogy-title {
  font-weight: 700;
  margin-bottom: 0.25rem;
}
.chapter-main .reading-title  { color: var(--accent); }
.chapter-main .note-title     { color: var(--warn-text); }
.chapter-main .war-title      { color: var(--danger-text); }
.chapter-main .pattern-title  { color: var(--purple-text); }
.chapter-main .analogy-title  { color: var(--purple-text); }

/* Hide the monolith's legacy in-page TOC inside extracted chapters —
   the sidebar already provides this. */
.chapter-main > .toc,
.chapter-main .toc-block { display: none; }

/* Chapter footer (next/prev) */
.chapter-footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; gap: 1rem;
}
.chapter-nav-card {
  flex: 1; padding: 1rem 1.25rem;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg);
}
.chapter-nav-card:hover { border-color: var(--accent); text-decoration: none; }
.chapter-nav-card .label {
  font-size: 0.78rem; text-transform: uppercase;
  color: var(--text-soft); letter-spacing: 0.06em;
  margin-bottom: 0.25rem;
}
.chapter-nav-card .title { color: var(--text); font-weight: 700; font-size: 1rem; }
.chapter-nav-card.next { text-align: right; }

/* Mobile sidebar handling */
@media (max-width: 980px) {
  .chapter-layout { grid-template-columns: 1fr; gap: 1.5rem; }
  .chapter-sidebar {
    position: static; max-height: none;
    border: 1px solid var(--border); border-radius: var(--radius);
    padding: 1rem;
  }
}

/* ---- Footer ---- */
footer.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
  padding: 2.5rem 0.5rem;
  text-align: center;
  color: var(--text-soft);
  font-size: 0.92rem;
}
footer.site-footer a { color: var(--text-muted); margin: 0 0.5rem; }

/* =========================================================
   Component additions: progress bar, scroll-spy, copy btn,
   icon buttons (theme/search), mobile drawer, related, print
   ========================================================= */

/* Reading progress bar — appears on chapter pages */
.reading-progress {
  position: fixed; top: 0; left: 0;
  height: 3px; width: 0%;
  background: var(--accent);
  z-index: 60;
  transition: width 0.08s linear;
  pointer-events: none;
}

/* Scroll-spy: highlight matching sidebar entry */
.chapter-sidebar a.is-active {
  color: var(--accent);
  font-weight: 600;
}
.chapter-sidebar li.is-active {
  position: relative;
}
.chapter-sidebar li.is-active::before {
  content: "";
  position: absolute;
  left: -1.5rem; top: 0.2rem; bottom: 0.2rem;
  width: 2px; background: var(--accent);
  border-radius: 2px;
}

/* Code-block copy button */
.chapter-main pre { position: relative; }
.copy-btn {
  position: absolute; top: 0.4rem; right: 0.4rem;
  font-size: 0.75rem; font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  border: 1px solid var(--border-strong);
  background: var(--bg);
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.12s, background 0.12s;
  font-family: var(--font);
}
.chapter-main pre:hover .copy-btn { opacity: 1; }
.copy-btn:hover { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
.copy-btn.copied { color: var(--success); border-color: var(--success); background: var(--success-bg); }

/* Icon buttons in topbar (theme toggle, search trigger) */
.icon-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 36px; height: 36px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
  font-size: 1rem;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.icon-btn svg { width: 16px; height: 16px; }

.topbar-actions { display: flex; gap: 0.5rem; align-items: center; margin-left: auto; }
.topbar-actions .nav-links { margin-left: 0; }

/* Search trigger styled like a search bar */
.search-trigger {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-soft);
  padding: 0.4rem 0.75rem;
  border-radius: 8px;
  font-size: 0.88rem;
  cursor: pointer;
  font-family: var(--font);
  min-width: 200px;
}
.search-trigger:hover { border-color: var(--accent); color: var(--text); }
.search-trigger kbd {
  margin-left: auto;
  font-family: var(--font);
  font-size: 0.72rem;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  padding: 0.05rem 0.35rem;
  color: var(--text-soft);
}

/* Mobile drawer (hamburger menu) */
.hamburger {
  display: none;
  background: transparent; border: 1px solid var(--border);
  width: 36px; height: 36px;
  border-radius: 8px; cursor: pointer;
  align-items: center; justify-content: center;
  color: var(--text);
}
.mobile-drawer {
  position: fixed; inset: 0;
  background: var(--bg);
  z-index: 100;
  display: none;
  flex-direction: column;
  padding: 1.5rem;
}
.mobile-drawer.is-open { display: flex; }
.mobile-drawer-head {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 2rem;
}
.mobile-drawer-links {
  display: flex; flex-direction: column; gap: 1rem;
}
.mobile-drawer-links a {
  font-size: 1.15rem; font-weight: 600;
  color: var(--text);
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}

/* Mobile bottom navigation — injected on every page that loads enhance.js */
.bottom-nav {
  display: none;
  position: fixed;
  left: 0; right: 0; bottom: 0;
  background: var(--bg);
  border-top: 1px solid var(--border);
  z-index: 90;
  /* Respect iOS safe-area insets so the bar floats above the home-indicator */
  padding-bottom: env(safe-area-inset-bottom);
}
.bottom-nav-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  max-width: 600px;
  margin: 0 auto;
}
.bottom-nav a {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 0.18rem;
  padding: 0.55rem 0.4rem 0.6rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.7rem;
  font-weight: 600;
  transition: color 100ms;
}
.bottom-nav a svg { width: 22px; height: 22px; stroke-width: 2; }
.bottom-nav a.is-active { color: var(--accent); }
.bottom-nav a:active { background: var(--bg-alt); }

@media (max-width: 820px) {
  .bottom-nav { display: block; }
  /* Lift any fixed footers / give regular content room above the bar (56px nav + a little) */
  body { padding-bottom: calc(60px + env(safe-area-inset-bottom)); }
  /* On mobile, the bottom-nav owns navigation — the page footer's link list is redundant. Hide it. */
  footer.site-footer { display: none; }
}

/* ---- Back link (small "← Back" affordance near the top of secondary pages) ---- */
.page-back {
  display: inline-flex; align-items: center; gap: 0.35rem;
  margin: 1rem 1rem 0;
  padding: 0.3rem 0.6rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 6px;
  transition: background 100ms, color 100ms;
}
.page-back:hover { background: var(--bg-alt); color: var(--text); }
.page-back::before { content: '←'; font-size: 0.95rem; line-height: 1; }
@media (max-width: 640px) { .page-back { margin-left: 0.85rem; } }

@media (max-width: 820px) {
  .nav-links { display: none; }
  .search-trigger { display: none; }
  .hamburger { display: inline-flex; }
}

/* ============================================================
   Mobile (≤ 640px) — keep the topbar single-line; let content breathe.
   ============================================================ */
@media (max-width: 640px) {
  /* Make sure nothing pushes the page wider than the viewport. */
  html, body { overflow-x: hidden; }

  /* Topbar: tighter padding, drop secondary CTAs that don't fit on phone. */
  .topbar-inner { padding: 0.5rem 0.75rem; gap: 0.4rem; }
  .topbar-actions { gap: 0.35rem; }
  .topbar-actions .btn-employers,
  .topbar-actions .icon-btn[data-theme-toggle] { display: none; }
  .brand { font-size: 0.95rem; }

  /* Sign up / Sign in: shrink the topbar button so it fits next to the brand. */
  .topbar-actions .btn-primary {
    padding: 0.45rem 0.85rem;
    font-size: 0.85rem;
    white-space: nowrap;
  }

  /* Hero / library hero text: scale down on phone. */
  .hero h1, .library-hero h1 { font-size: 1.6rem; line-height: 1.25; }
  .hero p.lead, .library-hero .library-tagline { font-size: 0.95rem; }
  .hero-cta { flex-wrap: wrap; gap: 0.5rem; }
  .hero-cta a { width: 100%; text-align: center; }

  /* Long URLs / code blocks inside chapters shouldn't overflow horizontally. */
  pre { white-space: pre; overflow-x: auto; }
  code { word-break: break-word; }

  /* Funnel cards stack 1-col on phone. */
  .funnel-choices.four,
  .three-pillars { grid-template-columns: 1fr !important; }

  /* Anywhere we set side margins via vw, fall back to safer values. */
  :root { --container: 100vw; }

  /* iOS: any input under 16px triggers an auto-zoom on focus. Disable that. */
  input[type="text"],
  input[type="email"],
  input[type="tel"],
  input[type="password"],
  input[type="number"],
  input[type="url"],
  input[type="search"],
  textarea,
  select { font-size: 16px !important; }
}

/* Related chapters at end of page */
.related-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.related-section h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-soft);
  margin: 0 0 1rem;
  font-weight: 700;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
}
.related-card {
  display: block;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  transition: all 0.15s;
}
.related-card:hover {
  border-color: var(--accent);
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.related-card .label {
  font-size: 0.72rem;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}
.related-card .title {
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.3;
}

/* Last-updated stamp in chapter meta */
.chapter-meta-bar .last-updated::before {
  content: "Updated ";
  color: var(--text-soft);
}

/* Pagefind UI overrides */
.pagefind-ui {
  --pagefind-ui-primary: var(--accent);
  --pagefind-ui-text: var(--text);
  --pagefind-ui-background: var(--bg);
  --pagefind-ui-border: var(--border);
  --pagefind-ui-tag: var(--bg-alt);
  --pagefind-ui-border-radius: var(--radius);
  --pagefind-ui-font: var(--font);
}
.search-modal {
  position: fixed; inset: 0;
  background: rgba(15, 23, 42, 0.5);
  z-index: 200;
  display: none;
  align-items: flex-start; justify-content: center;
  padding: 8vh 1rem;
}
.search-modal.is-open { display: flex; }
.search-modal-inner {
  width: 100%; max-width: 720px;
  background: var(--bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 1rem;
  max-height: 80vh;
  overflow-y: auto;
}

/* Print stylesheet — clean single-column save-as-PDF */
@media print {
  .topbar, .chapter-sidebar, .chapter-footer, .related-section,
  footer.site-footer, .reading-progress, .copy-btn,
  .hamburger, .topbar-actions, .search-modal { display: none !important; }
  .chapter-layout { display: block !important; padding: 0 !important; }
  .chapter-main { max-width: 100% !important; }
  body { font-size: 11pt; }
  a { color: var(--text); text-decoration: none; }
  a[href^="#"]::after { content: ""; }
  h1, h2, h3, h4 { page-break-after: avoid; }
  pre, table, blockquote { page-break-inside: avoid; }
}

/* Smooth scroll for anchor jumps */
html { scroll-behavior: smooth; }

/* =========================================================
   Mermaid diagrams + library hero illustration
   ========================================================= */

.chapter-main pre.mermaid,
.chapter-main div.mermaid {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 1.25rem;
  margin: 1.25rem 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 60px;
  overflow-x: auto;
}
.chapter-main pre.mermaid:not(.mermaid-rendered) {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  white-space: pre-wrap;
  text-align: left;
  display: block;
  color: var(--text-muted);
}
.chapter-main pre.mermaid svg,
.chapter-main div.mermaid svg {
  max-width: 100%;
  height: auto;
}

/* Library hero: arrange text + illustration side-by-side on desktop */
.library-hero .container {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 2.5rem;
  align-items: center;
}
.library-hero-illustration {
  display: flex;
  justify-content: center;
  align-items: center;
}
.library-hero-illustration svg {
  width: 100%;
  height: auto;
  max-width: 460px;
}
@media (max-width: 900px) {
  .library-hero .container { grid-template-columns: 1fr; }
  .library-hero-illustration { display: none; }
}

/* ============================================================
   Funnel pages, company tags, drawer hierarchy
   ============================================================ */

/* Company tag chips on worked-example chapter pages */
.company-tags {
  display: flex; flex-wrap: wrap; align-items: center;
  gap: 0.4rem; margin: -0.5rem 0 1.75rem;
  font-size: 0.85rem;
}
.company-tags-label {
  color: var(--text-soft);
  margin-right: 0.25rem;
}
.company-tag {
  display: inline-block;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.18rem 0.6rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
}

/* Drawer sub-items (indented under section headers) */
.mobile-drawer-links .drawer-sub {
  padding-left: 1.25rem;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

/* Funnel pages — landing/candidate/recruiter/prepare/jobs */
.funnel {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 1rem;
  text-align: center;
}
.funnel h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.015em;
  margin: 0 0 1rem;
}
.funnel p.lead {
  color: var(--text-muted);
  font-size: 1.15rem;
  max-width: 640px;
  margin: 0 auto 3rem;
}
.funnel-choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  max-width: 880px;
  margin: 0 auto;
}
.funnel-choices.three { grid-template-columns: 1fr 1fr 1fr; max-width: 1100px; }
.funnel-choices.four { grid-template-columns: 1fr 1fr; max-width: 980px; }
@media (max-width: 800px) {
  .funnel-choices, .funnel-choices.three, .funnel-choices.four { grid-template-columns: 1fr; }
}
.funnel-card {
  display: block;
  text-align: left;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  text-decoration: none !important;
  transition: all 0.15s;
  color: var(--text);
}
.funnel-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.funnel-card .icon {
  font-size: 1.8rem; margin-bottom: 0.75rem;
}
.funnel-card h3 {
  font-size: 1.3rem; margin: 0 0 0.5rem; font-weight: 700;
}
.funnel-card p {
  color: var(--text-muted); margin: 0 0 1rem; font-size: 0.95rem;
}
.funnel-card .cta {
  color: var(--accent); font-weight: 600; font-size: 0.92rem;
}
.funnel-card .cta::after { content: " →"; }

/* "Coming soon" banner for placeholder tracks */
.coming-soon-pill {
  display: inline-block;
  background: var(--warn-bg);
  color: var(--warn-text);
  font-size: 0.72rem;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-left: 0.5rem;
  vertical-align: middle;
}

/* Email-capture forms used on placeholder pages */
.email-capture {
  display: flex; gap: 0.5rem; max-width: 440px;
  margin: 1.5rem auto 0;
}
.email-capture input {
  flex: 1;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  font-size: 0.95rem;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
}
.email-capture input:focus { outline: 2px solid var(--accent); }
.email-capture button {
  background: var(--accent); color: white; border: none;
  padding: 0.7rem 1.25rem; border-radius: 8px;
  font-weight: 600; font-size: 0.95rem; cursor: pointer;
  font-family: var(--font);
}
.email-capture button:hover { background: var(--accent-hover); }

/* Primer / glossary page */
.primer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  max-width: 1200px;
  margin: 2rem auto;
}
.primer-term {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}
.primer-term dt {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.4rem;
  color: var(--text);
}
.primer-term dd {
  margin: 0; color: var(--text-muted);
  font-size: 0.9rem; line-height: 1.5;
}
.primer-term dd a { color: var(--accent); font-weight: 500; }
.primer-section-head {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-soft);
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  max-width: 1200px;
  margin-left: auto; margin-right: auto;
}
.primer-section-head:first-of-type { border-top: none; padding-top: 0; margin-top: 0; }

/* Methodology page — 5-step framework */
.method-step {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 1.5rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  background: var(--bg);
}
.method-step-num {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}
.method-step h3 {
  font-size: 1.3rem; font-weight: 700;
  margin: 0 0 0.5rem;
}
.method-step .meta {
  font-size: 0.85rem; color: var(--text-soft);
  margin-bottom: 0.75rem;
}
.method-step .pitfall {
  background: var(--danger-bg); border-left: 3px solid var(--danger);
  padding: 0.6rem 0.85rem; border-radius: 0 6px 6px 0;
  margin-top: 0.75rem; font-size: 0.92rem;
  color: var(--text);
}
.method-step .pitfall strong { color: var(--danger-text); }
@media (max-width: 720px) {
  .method-step { grid-template-columns: 1fr; gap: 0.5rem; }
  .method-step-num { font-size: 1.5rem; }
}

/* ============================================================
   Source-candidates page (recruiter view)
   ============================================================ */

.candidates-layout {
  max-width: var(--container);
  margin: 0 auto;
  padding: 2rem 0.5rem 4rem;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 2rem;
  align-items: start;
}
@media (max-width: 900px) { .candidates-layout { grid-template-columns: 1fr; } }

.filters-pane {
  position: sticky; top: 80px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  background: var(--bg);
}
.filter-header {
  display: flex; justify-content: space-between; align-items: center;
  padding-bottom: 0.6rem; margin-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
}
.filter-header h3 { margin: 0; font-size: 1rem; font-weight: 700; }
.filter-reset {
  background: transparent; border: none; color: var(--accent);
  font-size: 0.82rem; font-weight: 600; cursor: pointer;
  font-family: var(--font);
}
.filter-reset:hover { text-decoration: underline; }
.filter-group { margin: 1rem 0; }
.filter-group h4 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-soft);
  margin: 0 0 0.5rem;
  font-weight: 700;
}
.filter-options { display: flex; flex-direction: column; gap: 0.3rem; }
.filter-options.scroll { max-height: 180px; overflow-y: auto; padding-right: 0.4rem; }
.check {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 0.88rem; color: var(--text);
  cursor: pointer; padding: 0.15rem 0;
}
.check input { accent-color: var(--accent); cursor: pointer; }
.range-row {
  display: flex; align-items: center; gap: 0.4rem;
  font-size: 0.85rem; color: var(--text-muted);
}
.range-row input {
  width: 70px; padding: 0.35rem 0.5rem;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--bg); color: var(--text);
  font-family: var(--font); font-size: 0.85rem;
}
.range-row input:focus { outline: 2px solid var(--accent); }
.range-sep { color: var(--text-soft); }
.range-suffix { color: var(--text-soft); font-size: 0.78rem; }

.candidates-main { min-width: 0; }
.candidates-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 1.25rem;
}
.candidates-header h1 {
  font-size: 1.4rem; margin: 0; font-weight: 700;
}
.candidates-header .count-meta { color: var(--text-soft); font-size: 0.9rem; }
.candidates-list {
  display: grid; gap: 1rem;
}
.empty-state {
  padding: 3rem 1rem; text-align: center;
  color: var(--text-soft); font-size: 0.95rem;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
}

.cand-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.cand-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-sm); }
.cand-head {
  display: flex; justify-content: space-between; align-items: flex-start;
  margin-bottom: 0.85rem;
}
.cand-id { display: flex; gap: 0.85rem; align-items: center; }
.cand-avatar {
  width: 44px; height: 44px;
  background: var(--accent-soft); color: var(--accent);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.78rem;
}
.cand-position { font-size: 1.05rem; font-weight: 700; color: var(--text); }
.cand-meta { font-size: 0.85rem; color: var(--text-muted); margin-top: 0.1rem; }
.badge-active {
  background: var(--success-bg); color: var(--success-text);
  font-size: 0.72rem; font-weight: 700;
  padding: 0.18rem 0.55rem; border-radius: 999px;
  text-transform: uppercase; letter-spacing: 0.04em;
}
.badge-passive {
  background: var(--bg-alt); color: var(--text-soft);
  font-size: 0.72rem; font-weight: 700;
  padding: 0.18rem 0.55rem; border-radius: 999px;
  text-transform: uppercase; letter-spacing: 0.04em;
}
.cand-tracks {
  display: flex; align-items: center; gap: 0.4rem; flex-wrap: wrap;
  margin-bottom: 0.6rem;
}
.cand-label { font-size: 0.78rem; color: var(--text-soft); font-weight: 600; }
.track-chip {
  background: var(--accent-soft); color: var(--accent);
  font-size: 0.75rem; font-weight: 600;
  padding: 0.15rem 0.55rem; border-radius: 999px;
}
.cand-empty { color: var(--text-soft); font-size: 0.85rem; font-style: italic; }
.cand-skills {
  display: flex; flex-wrap: wrap; gap: 0.3rem;
  margin-bottom: 0.85rem;
}
.skill-chip {
  background: var(--bg-alt); color: var(--text-muted);
  border: 1px solid var(--border);
  font-size: 0.74rem; font-weight: 500;
  padding: 0.12rem 0.5rem; border-radius: 4px;
}
.cand-attrs {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
  padding: 0.6rem 0;
  border-top: 1px solid var(--border);
  margin-bottom: 0.85rem;
  font-size: 0.85rem;
}
.cand-attrs > div { display: flex; flex-direction: column; gap: 0.1rem; }
.attr-label { font-size: 0.7rem; color: var(--text-soft); text-transform: uppercase; letter-spacing: 0.05em; }
.attr-val { color: var(--text); font-weight: 600; }
@media (max-width: 720px) { .cand-attrs { grid-template-columns: repeat(2, 1fr); } }
.cand-actions {
  display: flex; gap: 0.5rem; align-items: center;
}
.cand-actions .btn-primary {
  background: var(--accent); color: white;
  padding: 0.45rem 0.95rem;
  border: none; border-radius: 6px;
  font-weight: 600; font-size: 0.88rem;
  cursor: pointer; font-family: var(--font);
}
.cand-actions .btn-primary:hover { background: var(--accent-hover); }
.btn-link {
  background: transparent; border: none;
  color: var(--text-muted); font-size: 0.88rem;
  cursor: pointer; font-family: var(--font);
  padding: 0.45rem 0.5rem;
}
.btn-link:hover { color: var(--accent); }

/* ============================================================
   Dropdown nav (Learn ▾), homepage 3-pillar layout
   ============================================================ */

.nav-links { position: relative; }
.nav-item-dropdown {
  position: relative;
  display: inline-flex;
  align-items: center;
}
.nav-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  cursor: pointer;
}
.nav-trigger .caret {
  font-size: 0.7em;
  color: var(--text-soft);
  transition: transform 0.15s;
}
.nav-item-dropdown:hover .caret,
.nav-item-dropdown:focus-within .caret { transform: translateY(1px); color: var(--accent); }

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: -0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 0.4rem 0;
  min-width: 220px;
  display: none;
  z-index: 100;
  margin-top: 0.5rem;
}
.nav-item-dropdown:hover .nav-dropdown,
.nav-item-dropdown:focus-within .nav-dropdown { display: block; }
.nav-dropdown a {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
}
.nav-dropdown a.active { color: var(--accent); font-weight: 600; }
.nav-dropdown a:hover {
  background: var(--bg-alt);
  color: var(--accent);
  text-decoration: none;
}
.nav-dropdown .divider {
  height: 1px;
  background: var(--border);
  margin: 0.4rem 0;
}

/* Home 3-pillar layout */
.three-pillars {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1.25rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}
@media (max-width: 960px) { .three-pillars { grid-template-columns: 1fr; } }
.pillar {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
  text-decoration: none !important;
  transition: all 0.2s;
  color: var(--text);
  display: flex; flex-direction: column;
}
.pillar:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.pillar .icon { font-size: 2rem; margin-bottom: 0.85rem; }
.pillar h3 {
  font-size: 1.45rem;
  font-weight: 800;
  margin: 0 0 0.5rem;
  letter-spacing: -0.01em;
}
.pillar .stat {
  font-size: 0.78rem;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  margin-bottom: 1rem;
}
.pillar p {
  color: var(--text-muted);
  margin: 0 0 1.5rem;
  font-size: 0.95rem;
  flex: 1;
}
.pillar .pillar-cta {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
}
.pillar .pillar-cta::after { content: " →"; transition: transform 0.15s; }
.pillar:hover .pillar-cta::after { transform: translateX(3px); }
.pillar.learn { border-top: 4px solid var(--accent); }
.pillar.jobs { border-top: 4px solid var(--warn); }
.pillar.mentors { border-top: 4px solid var(--purple); }

/* Social proof bar */
.social-proof {
  margin: 4rem auto;
  max-width: 980px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
  text-align: center;
}
.social-proof.social-proof-2 { grid-template-columns: 1fr 1fr; max-width: 720px; }
@media (max-width: 720px) {
  .social-proof,
  .social-proof.social-proof-2 { grid-template-columns: 1fr; }
}
.social-proof .num {
  font-size: 1.6rem; font-weight: 800;
  color: var(--accent);
  line-height: 1;
}
.social-proof .label {
  font-size: 0.78rem;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 0.3rem;
  font-weight: 600;
}

/* B2B secondary cards (recruiter + mentor) at bottom of home */
.b2b-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  max-width: 980px;
  margin: 4rem auto;
  padding: 0 1rem;
}
@media (max-width: 720px) { .b2b-row { grid-template-columns: 1fr; } }
.b2b-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  text-decoration: none !important;
  color: var(--text);
  transition: all 0.15s;
}
.b2b-card:hover { border-color: var(--accent); background: var(--bg-alt); }
.b2b-card h4 {
  font-size: 1.1rem; margin: 0 0 0.4rem; font-weight: 700;
}
.b2b-card p { color: var(--text-muted); margin: 0; font-size: 0.92rem; }
.b2b-card .arrow { color: var(--accent); font-weight: 600; }

/* ============================================================
   Sign-in modal + signed-in user chip
   ============================================================ */

.signin-modal {
  position: fixed; inset: 0;
  background: rgba(15, 23, 42, 0.55);
  z-index: 300;
  display: none;
  align-items: center; justify-content: center;
  padding: 1.5rem;
}
.signin-modal.is-open { display: flex; }
.signin-card {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 2rem;
  max-width: 460px; width: 100%;
  position: relative;
  box-shadow: var(--shadow-lg);
}
.signin-close {
  position: absolute; top: 0.75rem; right: 0.75rem;
  background: transparent; border: none;
  font-size: 1.1rem; color: var(--text-soft);
  cursor: pointer; padding: 0.4rem 0.55rem;
  border-radius: 6px;
}
.signin-close:hover { background: var(--bg-alt); color: var(--text); }
.signin-card h2 { font-size: 1.4rem; margin: 0 0 0.4rem; font-weight: 700; }
.signin-sub  { color: var(--text-muted); margin: 0 0 1.25rem; font-size: 0.92rem; }
.signin-roles {
  display: flex; flex-direction: column; gap: 0.5rem;
  margin-bottom: 1.25rem;
}
.signin-roles label {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.65rem 0.85rem;
  font-size: 0.9rem;
  color: var(--text);
  cursor: pointer;
  display: flex; gap: 0.5rem; align-items: flex-start;
}
.signin-roles label:hover { border-color: var(--accent); }
.signin-roles input[type="radio"] { accent-color: var(--accent); margin-top: 0.2rem; flex-shrink: 0; }
.signin-roles label:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.signin-providers { display: flex; flex-direction: column; gap: 0.5rem; }
.signin-btn {
  width: 100%; padding: 0.7rem 1rem;
  border: 1px solid var(--border-strong);
  background: var(--bg); color: var(--text);
  border-radius: 8px; cursor: pointer;
  font-weight: 600; font-size: 0.95rem;
  font-family: var(--font);
}
.signin-btn:hover { border-color: var(--accent); color: var(--accent); }

@media (max-width: 480px) {
  .signin-modal { padding: 0.75rem; align-items: flex-end; }
  .signin-card  { padding: 1.25rem; border-radius: 14px 14px 0 0; }
  .signin-card h2 { font-size: 1.2rem; }
  .signin-sub { font-size: 0.85rem; }
  .uname-input-row { padding: 0 0.6rem; }
  .uname-input-row input { font-size: 16px; }       /* iOS: ≥16px to prevent zoom on focus */
  .signin-card input[type="tel"],
  .signin-card input[type="text"],
  .signin-card input[type="email"] { font-size: 16px; }
}

.signin-btn-primary {
  background: var(--accent); color: white; border-color: var(--accent);
}
.signin-btn-primary:hover { background: var(--accent-hover); color: white; border-color: var(--accent-hover); }
.signin-btn-primary:disabled { opacity: 0.5; cursor: not-allowed; background: var(--accent); color: white; }

/* ============================================================
   Username claim + attest-connection modals (reuse signin-card chrome)
   ============================================================ */
.uname-card { max-width: 460px; width: 100%; }
.uname-field { margin-top: 1rem; }
.uname-field label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.4rem;
}
.uname-input-row {
  display: flex; align-items: center;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 0 0.7rem;
  background: var(--bg);
}
.uname-input-row:focus-within { border-color: var(--accent); }
.uname-at {
  font-weight: 700;
  color: var(--text-soft);
  margin-right: 0.2rem;
}
.uname-input-row input {
  flex: 1; padding: 0.65rem 0;
  border: none; outline: none;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 1rem;
}
.uname-field textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 0.95rem;
  resize: vertical;
}
.uname-field textarea:focus { border-color: var(--accent); outline: none; }
.uname-feedback {
  margin-top: 0.45rem;
  font-size: 0.82rem;
  color: var(--text-soft);
  min-height: 1.1em;
}
.uname-feedback-err { color: var(--danger); }
.uname-feedback-ok  { color: var(--success); }
.uname-actions {
  display: flex; gap: 0.6rem;
  margin-top: 1.25rem;
}
.uname-actions .signin-btn { flex: 1; }
.signin-google::before   { content: "🔵  "; }
.signin-linkedin::before { content: "💼  "; }

.signin-dev {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-soft);
}
.signin-dev summary { cursor: pointer; padding: 0.25rem 0; }
.signin-dev-help { color: var(--text-soft); font-size: 0.82rem; margin: 0.5rem 0; }
.signin-dev input {
  display: block; width: 100%;
  padding: 0.55rem 0.75rem; margin: 0.4rem 0;
  border: 1px solid var(--border-strong);
  border-radius: 6px; font-size: 0.9rem;
  background: var(--bg); color: var(--text);
  font-family: var(--font);
}
.signin-dev-btn { background: var(--accent); color: white !important; border-color: var(--accent); margin-top: 0.5rem; }
.signin-dev-btn:hover { background: var(--accent-hover); color: white !important; }
.signin-error {
  margin-top: 0.85rem;
  color: var(--danger-text);
  background: var(--danger-bg);
  padding: 0.55rem 0.75rem; border-radius: 6px;
  font-size: 0.88rem;
}

/* User chip (replaces "Sign in" button when authed) */
.user-chip {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.35rem 0.85rem 0.35rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
  cursor: pointer;
  font-size: 0.92rem;
  position: relative;
}
.user-chip:hover { border-color: var(--accent); }
.user-avatar {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px;
  background: var(--accent); color: white;
  border-radius: 50%; font-weight: 700; font-size: 0.78rem;
}
.user-name { font-weight: 600; max-width: 140px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-caret { color: var(--text-soft); font-size: 0.7rem; }
.user-dropdown {
  position: absolute; top: 100%; right: 0;
  margin-top: 0.4rem;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-md);
  display: none;
  min-width: 160px;
  padding: 0.4rem 0;
  z-index: 110;
}
.user-chip.is-open .user-dropdown { display: block; }
.user-dropdown a {
  display: block; padding: 0.5rem 1rem;
  color: var(--text); font-size: 0.9rem;
}
.user-dropdown a:hover { background: var(--bg-alt); color: var(--accent); text-decoration: none; }

/* Methodology section embedded inside the HLD Examples library page */
.methodology-section {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 3rem 0;
}
.methodology-section-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 1rem;
}
.methodology-head {
  text-align: center;
  margin-bottom: 2rem;
}
.methodology-head h2 {
  font-size: 1.6rem; font-weight: 800;
  margin: 0.5rem 0 0.75rem;
  letter-spacing: -0.01em;
}
.methodology-head p {
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto;
}

/* Match-score badge on applicant cards */
.match-badge {
  display: inline-flex; flex-direction: column;
  align-items: center; justify-content: center;
  min-width: 56px; padding: 0.35rem 0.5rem;
  border-radius: 10px;
  border: 1px solid;
  cursor: help;
  font-family: var(--font);
  line-height: 1;
}
.match-badge .match-num   { font-size: 1.1rem; font-weight: 800; }
.match-badge .match-label { font-size: 0.62rem; text-transform: uppercase; letter-spacing: 0.04em; margin-top: 0.2rem; font-weight: 600; }
.match-badge.tier-strong { background: var(--success-bg); border-color: var(--success); color: var(--success-text); }
.match-badge.tier-good   { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.match-badge.tier-okay   { background: var(--warn-bg);    border-color: var(--warn);    color: var(--warn-text); }
.match-badge.tier-weak   { background: var(--bg-alt);     border-color: var(--border-strong); color: var(--text-muted); }

/* Generic form layout — two-column grid with labels stacked,
   full-width fields with .full. */
.app-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem 1rem;
  max-width: 720px;
}
.app-form label {
  display: flex;
  flex-direction: column;
  font-size: 0.85rem;
  color: var(--text-muted);
  gap: 0.3rem;
}
.app-form label.full { grid-column: 1 / -1; }
.app-form input,
.app-form textarea,
.app-form select {
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
}
.app-form input:focus,
.app-form textarea:focus,
.app-form select:focus { outline: 2px solid var(--accent); }
.app-form textarea { resize: vertical; min-height: 80px; }
.app-form label > input[type="checkbox"] {
  width: 18px; height: 18px;
  margin-right: 0.5rem;
  accent-color: var(--accent);
}
.app-form button[type="submit"] {
  padding: 0.75rem 1.5rem;
  border: none; border-radius: 8px;
  background: var(--accent); color: white;
  cursor: pointer; font-family: var(--font);
  font-weight: 600; font-size: 0.95rem;
  grid-column: 1 / -1;
  justify-self: start;
  margin-top: 0.5rem;
}
.app-form button[type="submit"]:hover { background: var(--accent-hover); }

/* Section divider inside a long form (separating resume from contact links) */
.app-form .form-divider {
  grid-column: 1 / -1;
  border-top: 1px solid var(--border);
  margin: 0.5rem 0;
}

@media (max-width: 720px) { .app-form { grid-template-columns: 1fr; } }

/* "Employers" topbar button — secondary CTA next to "Sign in" */
.btn-employers {
  background: var(--bg);
  color: var(--text) !important;
  border: 1px solid var(--border-strong);
  padding: 0.45rem 0.9rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.92rem;
  text-decoration: none !important;
  white-space: nowrap;
}
.btn-employers:hover {
  border-color: var(--accent);
  color: var(--accent) !important;
}
@media (max-width: 820px) {
  .btn-employers { display: none; }       /* surfaced via mobile drawer */
}

/* Phone provider button (placeholder until OTP is built) */
.signin-btn.signin-phone {
  position: relative;
  opacity: 0.7;
  cursor: not-allowed;
}
.signin-btn.signin-phone:hover {
  border-color: var(--border-strong);
  color: var(--text);
}
.signin-btn.signin-phone::before { content: "📱  "; }
.signin-btn.signin-phone .soon-pill {
  background: var(--warn-bg); color: var(--warn-text);
  font-size: 0.65rem; font-weight: 700;
  padding: 0.1rem 0.45rem; border-radius: 999px;
  margin-left: 0.4rem; text-transform: uppercase;
  letter-spacing: 0.04em; vertical-align: middle;
}

/* Phone-OTP step within the sign-in modal */
.signin-card .signin-field {
  display: flex; flex-direction: column; gap: 0.35rem;
  font-size: 0.85rem; color: var(--text-muted);
  margin-bottom: 0.85rem;
}
.signin-card .signin-field input[type="tel"],
.signin-card .signin-field input[type="text"] {
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--bg); color: var(--text);
  font-family: var(--font); font-size: 0.95rem;
}
.signin-card .phone-row { display: flex; }
.signin-card .phone-cc {
  padding: 0.55rem 0.75rem;
  background: var(--bg-alt);
  border: 1px solid var(--border-strong);
  border-right: none;
  border-radius: 6px 0 0 6px;
  font-weight: 600; color: var(--text);
}
.signin-card .phone-row input { flex: 1; border-radius: 0 6px 6px 0 !important; }
.signin-card .signin-otp {
  width: 100%; padding: 0.7rem;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--bg); color: var(--text);
  font-family: var(--font-mono); font-size: 1.4rem;
  letter-spacing: 0.4em;
  text-align: center;
  margin-bottom: 0.85rem;
}
.signin-card .signin-otp:focus { outline: 2px solid var(--accent); }
.signin-card [data-step] { margin-top: 0.5rem; }
.signin-phone::before { content: "📱  "; }
.signin-btn.signin-phone {
  background: var(--accent); color: white !important; border-color: var(--accent);
}
.signin-btn.signin-phone:hover {
  background: var(--accent-hover); color: white !important; border-color: var(--accent-hover);
}

/* Signup ↔ Sign-in toggle line at the bottom of the modal */
.signin-toggle {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
}
.signin-toggle a {
  color: var(--accent);
  font-weight: 600;
  margin-left: 0.25rem;
}

/* AI Engineer curriculum layout */
.ai-curriculum {
  max-width: 980px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}
.ai-stage {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  margin-bottom: 1.25rem;
}
.ai-stage-head {
  display: flex; align-items: center; gap: 1.25rem;
  margin-bottom: 0.6rem;
}
.ai-stage-num {
  width: 48px; height: 48px;
  background: var(--accent); color: white;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1.3rem;
  flex-shrink: 0;
}
.ai-stage h2 { font-size: 1.3rem; margin: 0; font-weight: 800; }
.ai-stage-meta { color: var(--text-soft); font-size: 0.88rem; margin-top: 0.15rem; }
.ai-stage-tag {
  color: var(--text-muted);
  font-style: italic;
  margin: 0.5rem 0 1rem;
}
.ai-topics { padding-left: 1.25rem; margin: 0.75rem 0 1rem; }
.ai-topics li { margin-bottom: 0.45rem; line-height: 1.55; }
.ai-resources {
  padding: 0.85rem 1rem;
  background: var(--bg-alt);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  font-size: 0.9rem;
  line-height: 1.7;
}
.ai-resources a { margin: 0 0.1rem; }