/* ═══════════════════════════════════════════════════════
   CodeBobby — main.css
   Shared styles for all pages. 
   Page-specific styles are in css/page-name.css
   ══════════════════════════════════════════════════════ */

/* ── Google Fonts are loaded via <link> in each page ── */

/* ── CSS Variables ── */
:root {
  --bg:       #080c10;
  --surface:  #0d1117;
  --surface2: #111820;
  --surface3: #141c26;
  --border:   #1e2d3d;
  --border2:  #253545;
  --accent:   #00f5a0;
  --accent2:  #00d4ff;
  --accent3:  #ff4d6d;
  --accent4:  #f5a623;
  --orange:   #f5a623;   /* alias for --accent4 — used by .warn-box */
  --purple:   #a855f7;
  --text:     #cdd9e5;
  --text-dim: #5a7a8a;
  --text-mid: #8aa0b0;
  --mono:     'Share Tech Mono', monospace;
  --display:  'Syne', sans-serif;
  --body:     'DM Sans', sans-serif;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0,0,0,.035) 2px, rgba(0,0,0,.035) 4px);
  pointer-events: none;
  z-index: 9999;
}

/* ── Top Nav ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 3rem;
  background: rgba(8,12,16,.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  gap: 1.5rem;
}
.nav-logo {
  font-family: var(--mono);
  font-size: 1.2rem;
  color: var(--accent);
  letter-spacing: .08em;
  text-decoration: none;
}
.nav-logo span { color: var(--accent2); }
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a {
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--text-dim);
  text-decoration: none;
  letter-spacing: .1em;
  text-transform: uppercase;
  transition: color .2s;
}
.nav-links a:hover { color: var(--accent); }
.nav-cta {
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--bg);
  background: var(--accent);
  border: none;
  padding: .55rem 1.2rem;
  cursor: pointer;
  letter-spacing: .08em;
  text-transform: uppercase;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  transition: background .2s;
  text-decoration: none;
  display: inline-block;
}
.nav-cta:hover { background: var(--accent2); }

/* ── Footer ── */
footer {
  padding: 2.5rem 3rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface);
}
.footer-logo { font-family: var(--mono); font-size: 1rem; color: var(--accent); }
.footer-logo span { color: var(--accent2); }
.footer-tagline { font-family: var(--mono); font-size: .65rem; color: var(--text-dim); margin-top: .3rem; }
.footer-links { display: flex; gap: 2rem; list-style: none; }
.footer-links a {
  font-family: var(--mono);
  font-size: .7rem;
  color: var(--text-dim);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: .08em;
  transition: color .2s;
}
.footer-links a:hover { color: var(--accent); }

/* ── Cursor Glow ── */
.cursor-glow {
  position: fixed;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(0,212,255,.04) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 2;
}

/* ── Reveal animation ── */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .55s cubic-bezier(.16,1,.3,1), transform .55s cubic-bezier(.16,1,.3,1); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── Buttons ── */
.btn-primary {
  font-family: var(--mono);
  font-size: .82rem;
  padding: .85rem 2rem;
  background: var(--accent2);
  color: var(--bg);
  border: none;
  cursor: pointer;
  letter-spacing: .08em;
  text-transform: uppercase;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: all .2s;
  text-decoration: none;
  display: inline-block;
}
.btn-primary:hover { background: var(--accent); transform: translateY(-2px); }
.btn-ghost {
  font-family: var(--mono);
  font-size: .82rem;
  padding: .85rem 2rem;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  cursor: pointer;
  letter-spacing: .08em;
  text-transform: uppercase;
  text-decoration: none;
  display: inline-block;
  transition: all .2s;
}
.btn-ghost:hover { border-color: var(--accent2); color: var(--accent2); transform: translateY(-2px); }

/* ── Tags ── */
.ttag {
  font-family: var(--mono);
  font-size: .65rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: .22rem .65rem;
  border: 1px solid;
}
.ttag.green { color: var(--accent);  border-color: rgba(0,245,160,.3);  background: rgba(0,245,160,.06); }
.ttag.blue  { color: var(--accent2); border-color: rgba(0,212,255,.3);  background: rgba(0,212,255,.06); }
.ttag.red   { color: var(--accent3); border-color: rgba(255,77,109,.3); background: rgba(255,77,109,.06); }
.ttag.purple{ color: var(--purple);  border-color: rgba(168,85,247,.3); background: rgba(168,85,247,.06); }

/* ── Responsive ── */
@media (max-width: 700px) {
  nav { padding: 1rem 1.5rem; }
  .nav-links { display: none; }
  footer { flex-direction: column; padding: 2rem 1.5rem; }
}

/* ── Utility classes (replaces common inline styles) ── */
.ta-center { text-align: center; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-row { display: flex; align-items: center; gap: 1rem; }
/* ── Global link states ── */
a { text-decoration: none; color: var(--accent2); transition: color 0.2s; }
a:hover        { color: var(--accent); }
a:visited      { color: var(--purple); }
a:active       { color: var(--accent3); }
a:focus-visible{ outline: 1px solid var(--accent); outline-offset: 3px; border-radius: 1px; }

/* Nav & footer links — stay dim regardless of visited state (they're wayfinding, not content) */
.nav-links a,
.nav-links a:visited,
.footer-links a,
.footer-links a:visited { color: var(--text-dim); }
.nav-links a:hover,
.footer-links a:hover   { color: var(--accent); }

/* Buttons as <a> — colour is part of the button style, override all states */
.btn-primary,
.btn-primary:hover,
.btn-primary:visited,
.btn-primary:active { color: var(--bg); }
.btn-ghost,
.btn-ghost:visited  { color: var(--text); }
.btn-ghost:hover    { color: var(--accent2); }
.nav-cta,
.nav-cta:visited    { color: var(--bg); }

/* Video title links — on dark overlay, white base */
.video-title a              { color: #fff; }
.video-title a:hover        { color: var(--accent); }
.video-title a:visited      { color: rgba(255,255,255,0.65); }

/* Mini video sidebar links */
.mini-title a              { color: var(--text); }
.mini-title a:hover        { color: var(--accent2); }
.mini-title a:visited      { color: var(--text-mid); }

/* Article card read-more links */
.article-read              { color: var(--accent2); }
.article-read:hover        { color: var(--accent); }
.article-read:visited      { color: var(--text-mid); }

/* Search result links */
.sr-title a              { color: var(--text); }
.sr-title a:hover        { color: var(--accent); }
.sr-title a:visited      { color: var(--text-mid); }

/* ── Series nav active state ── */
.series-num.active-part {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

/* ── Concept card name colours ── */
.concept-name.accent  { color: var(--accent); }
.concept-name.accent2 { color: var(--accent2); }
.concept-name.accent3 { color: var(--accent3); }
.concept-name.purple  { color: var(--purple); }

/* ── Stage number colours ── */
.stage-num.accent  { background: var(--accent); }
.stage-num.accent2 { background: var(--accent2); }
.stage-num.accent3 { background: var(--accent3); }
.stage-num.orange  { background: var(--accent4); }

/* ── Dot colours ── */
.toc-dot.accent  { background: var(--accent); }
.toc-dot.accent2 { background: var(--accent2); }
.toc-dot.accent3 { background: var(--accent3); }

/* ── SVG icon size utility ── */
.icon-sm { flex-shrink: 0; width: 12px; height: 12px; }

/* ── Spacing utilities ── */
.mt-8  { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-24 { margin-top: 24px; }
.mt-28 { margin-top: 28px; }
.mb-12 { margin-bottom: 12px; }
.mb-24 { margin-bottom: 24px; }

/* ── Text colour utilities ── */
.text-mid  { color: var(--text-mid); }
.text-dim  { color: var(--text-dim); }
.text-white { color: #fff; }
.mono-dim  { font-family: var(--mono); color: var(--text-dim); font-size: .68rem; }
.mono-accent2 { font-family: var(--mono); color: var(--accent2); }

/* ── OpenOCD page code font ── */
.ocd-code { font-family: var(--mono); font-size: 12px; color: var(--accent); }

/* ── Flex gap utilities ── */
.flex-gap-half { display: flex; gap: .5rem; }
.flex-wrap     { flex-wrap: wrap; }

/* ── Purple accent ── */
.accent-purple-bg  { background: var(--purple); }
.accent-purple     { color: var(--purple); }

/* ── Indented note text ── */
.note-indent       { margin: 0.6rem 0 0.6rem 2rem; font-size: 0.68rem; color: var(--text-dim); }
.note-indent-accent3 { margin: 0.6rem 0 0.6rem 2rem; font-size: 0.68rem; color: var(--accent3); }
.note-indent-accent  { margin: 0.6rem 0 0.6rem 2rem; font-size: 0.68rem; color: var(--accent); }
.ml-2rem           { margin-left: 2rem; }

/* ── Blink animation (ticker / hero cursor) ── */
@keyframes blink { 50% { opacity: 0; } }
.blink-accent { animation: blink 1s step-end infinite; color: var(--accent); }

/* ── Search no-results padding ── */
.search-no-results-pad { padding: 1.2rem 3rem; font-family: var(--mono); font-size: 0.78rem; color: var(--text-dim); }

/* ── Accent colour utilities ── */
.accent-color    { color: var(--accent); }
.accent4-color   { color: var(--accent4); }
.mono-accent     { font-family: var(--mono); color: var(--accent); }
.orange-bg       { background: var(--accent4); }

/* ── Flex gap ── */
.flex-gap-sm { display: flex; gap: 0.5rem; }

/* ── OpenOCD spacing ── */
.mb-28 { margin-bottom: 28px; }

/* ── OpenOCD code font (no color) ── */
.ocd-font { font-family: var(--mono); font-size: 12px; }

/* ── Additional utilities from tutorial pages ── */
.flex-row-center { display: flex; align-items: center; gap: 1rem; }
.accent-link     { color: var(--accent); text-decoration: none; }
.accent2-color   { color: var(--accent2); }
.ocd-code-blue   { font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--accent2); }
.mt-10  { margin-top: 10px; }
.mt-20  { margin-top: 20px; }
.col-span-2 { grid-column: span 2; }
.flex-col-gap { display: flex; flex-direction: column; gap: 12px; margin-bottom: 24px; }

/* ── Search bar full-width fix (injected by search.js) ── */
.search-bar-wrap {
  position: fixed;
  top: 65px;
  left: 0;
  right: 0;
  width: 100vw;
  z-index: 99;
  background: rgba(8,12,16,0.97);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px);
  box-sizing: border-box;
}
.search-bar-inner {
  width: 100%;
  padding: 0.75rem 3rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-sizing: border-box;
}
.search-bar-icon {
  color: var(--text-dim);
  font-size: 1rem;
  flex-shrink: 0;
  pointer-events: none;
  font-family: var(--mono);
}
.search-bar-input {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.9rem;
  padding: 0.4rem 0;
  outline: none;
  letter-spacing: 0.04em;
  transition: border-color 0.2s;
}
.search-bar-input:focus { border-color: var(--accent); }
.search-bar-input::placeholder { color: var(--text-dim); }
.search-bar-kbd {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  background: var(--surface2);
  border: 1px solid var(--border);
  padding: 0.15rem 0.5rem;
  letter-spacing: 0.06em;
  flex-shrink: 0;
}
#search-results {
  display: none;
  width: 100%;
  background: var(--surface);
  border-top: 1px solid var(--border);
  max-height: 480px;
  overflow-y: auto;
  box-sizing: border-box;
}
#search-results.active { display: block; }
/* ── Search result items — shared base ── */
.search-result-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 0.85rem 3rem;
  border-bottom: 1px solid var(--border);
  border-left: 3px solid transparent;
  cursor: pointer;
  transition: background 0.15s, border-left-color 0.15s;
}
.search-result-item:last-child { border-bottom: none; }

/* ── Article results — green accent ── */
.sr-article {
  border-left-color: rgba(0,245,160,0.4);
}
.sr-article:hover {
  background: rgba(0,245,160,0.04);
  border-left-color: var(--accent);
}
.sr-article .sr-type {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--accent);
  background: rgba(0,245,160,0.08);
  border: 1px solid rgba(0,245,160,0.25);
  padding: 0.15rem 0.5rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  flex-shrink: 0;
  margin-top: 2px;
  border-radius: 2px;
}
.sr-article .sr-title a:hover { color: var(--accent); }
.sr-article .sr-meta { color: rgba(0,245,160,0.5); }

/* ── Video results — purple accent ── */
.sr-video {
  border-left-color: rgba(168,85,247,0.3);
}
.sr-video:hover {
  background: rgba(168,85,247,0.04);
  border-left-color: var(--purple);
}
.sr-video .sr-type {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--purple);
  background: rgba(168,85,247,0.08);
  border: 1px solid rgba(168,85,247,0.25);
  padding: 0.15rem 0.5rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  flex-shrink: 0;
  margin-top: 2px;
  border-radius: 2px;
}
.sr-video .sr-title a:hover { color: var(--purple); }
.sr-video .sr-meta { color: rgba(168,85,247,0.55); }

/* ── Shared title + meta ── */
.sr-title { font-family: var(--mono); font-size: 0.82rem; color: var(--text); }
.sr-title a { color: var(--text); text-decoration: none; }
.sr-meta { font-family: var(--mono); font-size: 0.68rem; margin-top: 0.25rem; }
.search-no-results { padding: 1.2rem 3rem; font-family: var(--mono); font-size: 0.78rem; color: var(--text-dim); }

/* ── Sensor-logger utilities ── */
.accent2-bg  { background: var(--accent2); }
.accent3-bg  { background: var(--accent3); }
.text-sm-dim { font-size: 0.85rem; color: var(--text-dim); line-height: 1.6; }

/* ═══════════════════════════════════════════════════════
   Shared sidebar + full-width layout
   Used by: .page-layout (tutorials) and .article-layout (articles)
   ══════════════════════════════════════════════════════ */

/* Both layout wrappers behave the same */
.page-layout,
.article-layout {
  display: block;
  padding-top: 125px;
}

/* Fixed sidebar — same on all pages */
.toc-sidebar {
  position: fixed;
  top: 125px;
  left: 0;
  width: 260px;
  height: calc(100vh - 125px);
  overflow-y: auto;
  padding: 2rem 1.5rem;
  border-right: 1px solid var(--border);
  background: var(--surface);
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
  z-index: 50;
}
.toc-sidebar::-webkit-scrollbar { width: 4px; }
.toc-sidebar::-webkit-scrollbar-track { background: transparent; }
.toc-sidebar::-webkit-scrollbar-thumb { background: var(--border2, #253545); border-radius: 2px; }

/* Main content — offset right of sidebar, full remaining width */
.page-layout > main,
.article-layout > main {
  margin-left: 260px;
  width: calc(100% - 260px);
  min-height: 100vh;
}

/* Responsive: hide sidebar, go full width */
@media (max-width: 1100px) {
  .toc-sidebar { display: none; }
  .page-layout > main,
  .article-layout > main {
    margin-left: 0;
    width: 100%;
  }
}

/* ── Article hero SVG thumbnail ── */
.article-hero-thumb {
  width: 100%;
  max-width: 1200px;
  margin: 2rem auto 2rem auto;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.06);
  box-shadow: 0 4px 32px rgba(0,0,0,0.4);
}