/* =====================================================
   Base Stylesheet — Revision Guides  v3
   Structural CSS only. Theme files supply colour vars.
   Load a theme CSS BEFORE this file.
   ===================================================== */

/* ── Google Fonts ─────────────────────────────────── */
/* Fonts are self-hosted under vendor/fonts/ and loaded by index.html, so
   there is no @import of a third-party stylesheet here. */

/* ── CSS custom properties ────────────────────────── */
:root {
  --font-body:  'DM Sans', system-ui, sans-serif;
  --font-code:  'Fira Code', 'Courier New', Consolas, monospace;
  --font-scale: 1;
}

/* ── Reset ────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

/* ── Body ─────────────────────────────────────────── */
body {
  font-family: var(--font-body);
  font-size: calc(14px * var(--font-scale));
  max-width: 1000px;
  margin: 20px auto;
  padding: 0 28px 60px;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  transition: background 0.25s ease, color 0.25s ease;
}

/* ── Headings ─────────────────────────────────────── */
h1 {
  font-family: var(--font-body);
  font-size: calc(22px * var(--font-scale));
  color: var(--accent);
  border-bottom: 3px solid var(--accent);
  padding-bottom: 7px;
  margin-top: 40px;
  letter-spacing: 0.01em;
}
h2 {
  font-family: var(--font-body);
  font-size: calc(20px * var(--font-scale));
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  padding-bottom: 4px;
  margin-top: 30px;
}
h3 {
  font-family: var(--font-body);
  font-size: calc(18px * var(--font-scale));
  color: var(--accent2);
  margin-top: 20px;
  margin-bottom: 6px;
}
h4 {
  font-family: var(--font-body);
  font-size: calc(16px * var(--font-scale));
  color: var(--text);
  font-weight: bold;
  margin-top: 14px;
}

/* ── Links ────────────────────────────────────────── */
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Tables — font-body so switcher applies ───────── */
table {
  border-collapse: collapse;
  width: 100%;
  margin: 12px 0 18px;
  font-size: calc(14px * var(--font-scale));
  font-family: var(--font-body);
}
th {
  background: var(--th-bg);
  color: var(--th-text);
  padding: 6px 10px;
  text-align: left;
  font-weight: 700;
  letter-spacing: 0.03em;
}
td {
  padding: 4px 10px;
  border: 1px solid var(--border-light);
  vertical-align: top;
  color: var(--text);
}
tr:nth-child(even) td { background: var(--td-alt); }

/* ── Code — always Fira Code, never overridden ────── */
code {
  font-family: var(--font-code) !important;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: calc(14px * var(--font-scale));
}
pre {
  font-family: var(--font-code) !important;
  background: var(--pre-bg);
  color: var(--pre-text);
  padding: 13px 18px;
  border-radius: 5px;
  overflow-x: auto;
  font-size: calc(14px * var(--font-scale));
  border-left: 3px solid var(--pre-border);
  line-height: 1.65;
  margin: 10px 0;
}
pre code { background: none; color: inherit; padding: 0; font-size: inherit; }

/* ── Blockquotes ──────────────────────────────────── */
blockquote {
  font-family: var(--font-body);
  border-left: 3px solid var(--bq-border);
  margin: 10px 0;
  padding: 7px 16px;
  color: var(--text-muted);
  background: var(--bq-bg);
  border-radius: 0 5px 5px 0;
  font-size: calc(14px * var(--font-scale));
}
/* 🧠 mnemonic blockquotes */
blockquote.bq-brain {
  border-left-color: var(--bq-brain-border);
  background:        var(--bq-brain-bg);
}
/* 💡 tip blockquotes */
blockquote.bq-bulb {
  border-left-color: var(--bq-bulb-border);
  background:        var(--bq-bulb-bg);
}

/* ── Lists ────────────────────────────────────────── */
ul, ol { padding-left: 24px; margin: 6px 0 10px; }
li { margin: 3px 0; }

/* ── Paragraphs & HR ──────────────────────────────── */
p { margin: 7px 0; }
hr { border: none; border-top: 1px solid var(--border-light); margin: 24px 0; }

/* ── Table of Contents — font-body so switcher applies */
nav#TOC {
  background: var(--toc-bg);
  border: 1px solid var(--border);
  padding: 14px 22px;
  border-radius: 6px;
  margin-bottom: 32px;
  font-size: calc(14px * var(--font-scale));
  font-family: var(--font-body);
}
nav#TOC ul { margin: 4px 0; padding-left: 18px; }
nav#TOC > ul { padding-left: 0; list-style: none; }
nav#TOC a { color: var(--toc-link); }
nav#TOC a:hover { text-decoration: underline; }
nav#TOC > ul > li { margin: 5px 0; font-weight: bold; }
nav#TOC > ul > li > ul > li { font-weight: normal; margin: 2px 0; }

/* =====================================================
   CONTROL PANEL  (#ctrl-panel)

   HTML structure:
     <div id="ctrl-panel">
       <button id="ctrl-btn">
         <div class="bar"><span/><span/><span/></div>
       </button>
       <div id="ctrl-menu">
         <a id="portal-link">
         <div class="ctrl-divider">
         <span class="ctrl-label">
         <button class="theme-option" data-theme="...">
           <span class="swatch">
         <button class="font-option" data-font="...">
           <span class="font-preview">
         <div class="size-row">
           <button class="size-btn" id="size-down">
           <span class="size-label" id="size-label">
           <button class="size-btn" id="size-up">
   ===================================================== */

/* ── Outer wrapper — fixed top-left ───────────────── */
#ctrl-panel {
  position: fixed;
  top: 16px;
  left: 18px;
  z-index: 10000;
  font-family: 'DM Sans', system-ui, sans-serif;
}

/* ── Hamburger button ─────────────────────────────── */
#ctrl-btn {
  width: 38px;
  height: 34px;
  background: var(--btn-bg);
  color: var(--btn-text);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 10px var(--shadow);
  transition: background 0.2s, box-shadow 0.2s;
  padding: 0;
}
#ctrl-btn:hover {
  background: var(--btn-hover);
  box-shadow: 0 4px 16px var(--shadow);
}

.bar { display: flex; flex-direction: column; gap: 4px; pointer-events: none; }
.bar span {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--btn-text);
  border-radius: 2px;
  transition: transform 0.22s ease, opacity 0.22s ease;
}
#ctrl-panel.open .bar span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
#ctrl-panel.open .bar span:nth-child(2) { opacity: 0; }
#ctrl-panel.open .bar span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ── Dropdown menu ────────────────────────────────── */
#ctrl-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  width: 210px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 28px var(--shadow);
  overflow: hidden;
  padding-bottom: 6px;
}
#ctrl-menu.open { display: block; animation: menuIn 0.18s ease; }

@keyframes menuIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Back to Portal ───────────────────────────────── */
#portal-link {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 10px 16px;
  font-size: 12px;
  font-weight: 600;
  color: var(--btn-text);
  background: var(--btn-bg);
  text-decoration: none;
  transition: background 0.15s;
}
#portal-link:hover { background: var(--btn-hover); text-decoration: none; }

/* ── Back to Top ──────────────────────────────────── */
#back-to-top-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 10px 16px;
  font-size: 12px;
  font-weight: 600;
  color: var(--btn-text);
  background: var(--btn-bg);
  border: none;
  cursor: pointer;
  width: 100%;
  text-align: left;
  font-family: inherit;
  letter-spacing: 0.03em;
  transition: background 0.15s;
}
#back-to-top-btn:hover { background: var(--btn-hover); }

/* ── Divider ──────────────────────────────────────── */
.ctrl-divider { border: none; border-top: 1px solid var(--border); margin: 6px 0 0; }

/* ── Section label ────────────────────────────────── */
.ctrl-label {
  display: block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 8px 16px 4px;
}

/* ── Theme buttons ────────────────────────────────── */
.theme-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 7px 16px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 12px;
  font-family: inherit;
  color: var(--text);
  text-align: left;
  transition: background 0.12s;
}
.theme-option:hover  { background: var(--border-light); }
.theme-option.active { color: var(--accent); font-weight: 700; }

.swatch {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--border);
  flex-shrink: 0;
}

/* ── Font buttons ─────────────────────────────────── */
.font-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 7px 16px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 12px;
  font-family: inherit;
  color: var(--text);
  text-align: left;
  transition: background 0.12s;
}
.font-option:hover  { background: var(--border-light); }
.font-option.active { color: var(--accent); font-weight: 700; }

.font-preview {
  width: 20px;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  flex-shrink: 0;
}
.font-option[data-font="dm-sans"]       .font-preview { font-family: 'DM Sans', sans-serif; }
.font-option[data-font="lora"]          .font-preview { font-family: 'Lora', Georgia, serif; }
.font-option[data-font="montserrat"]    .font-preview { font-family: 'Montserrat', sans-serif; }
.font-option[data-font="pangolin"]        .font-preview { font-family: 'Pangolin', cursive; }
.font-option[data-font="patrick-hand-sc"] .font-preview { font-family: 'Patrick Hand SC', cursive; }
.font-option[data-font="fira-code"]     .font-preview { font-family: 'Fira Code', monospace; }

/* Suppress broken fi/fl ligatures in Patrick Hand SC */
body.font-no-ligatures { font-variant-ligatures: none; }
/* Patrick Hand SC reads small — bump 4px on text elements only; code always stays Fira Code at base size */
body.font-patrick-hand-sc      { font-size: calc((14px + 4px) * var(--font-scale)); }
body.font-patrick-hand-sc h1   { font-size: calc((22px + 4px) * var(--font-scale)); }
body.font-patrick-hand-sc h2   { font-size: calc((20px + 4px) * var(--font-scale)); }
body.font-patrick-hand-sc h3   { font-size: calc((18px + 4px) * var(--font-scale)); }
body.font-patrick-hand-sc h4   { font-size: calc((16px + 4px) * var(--font-scale)); }
body.font-patrick-hand-sc table { font-size: calc((14px + 4px) * var(--font-scale)); }
body.font-patrick-hand-sc blockquote  { font-size: calc((14px + 4px) * var(--font-scale)); }
body.font-patrick-hand-sc nav#TOC  { font-size: calc((14px + 4px) * var(--font-scale)); }
/* Explicitly lock code/pre to Fira Code at the original size — never affected by font switching */
body.font-patrick-hand-sc code { font-family: var(--font-code) !important; font-size: calc(14px * var(--font-scale)); }
/*body.font-patrick-hand-sc pre  { font-family: var(--font-code) !important; font-size: calc(14px * var(--font-scale)); }*/

/* ── Size row ─────────────────────────────────────── */
.size-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px 10px;
}
.size-btn {
  width: 26px;
  height: 26px;
  background: var(--btn-bg);
  color: var(--btn-text);
  border: 1px solid var(--border);
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
  padding: 0;
  flex-shrink: 0;
}
.size-btn:hover    { background: var(--btn-hover); }
.size-btn:disabled { opacity: 0.35; cursor: default; }

.size-label {
  flex: 1;
  text-align: center;
  font-size: 11px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  min-width: 38px;
}

/* ── Print ────────────────────────────────────────── */
@media print {
  body { max-width: 100%; padding: 0; }
  nav#TOC { page-break-after: always; }
  h1 { page-break-before: always; }
  #ctrl-panel { display: none !important; }
}

/* ── Firefox: reduce box-shadow spread ────────────── */
@-moz-document url-prefix() {
  :root { --shadow: rgba(0,0,0,0.08); }
  #ctrl-btn, #ctrl-menu, .guide-card { box-shadow: 0 1px 4px var(--shadow) !important; }
  #ctrl-btn:hover, .guide-card:hover { box-shadow: 0 2px 8px var(--shadow) !important; }
}