/* Unity Tutorial Offline Site - Shared Styles */
:root {
  --bg: #1a1a2e;
  --bg2: #16213e;
  --bg3: #0f3460;
  --text: #e0e0e0;
  --text2: #a0a0b0;
  --accent: #e94560;
  --accent2: #533483;
  --link: #4fc3f7;
  --code-bg: #0d1117;
  --warn-bg: #2d1b00;
  --warn-border: #f59e0b;
  --tip-bg: #0a2e1a;
  --tip-border: #10b981;
  --err-bg: #2d0a0a;
  --err-border: #ef4444;
  --info-bg: #0a1a2e;
  --info-border: #3b82f6;
  --sidebar-w: 280px;
  --nav-h: 52px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', sans-serif;
  background: var(--bg); color: var(--text);
  line-height: 1.8; font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 2.2em; color: #fff; margin: 0.5em 0 0.3em; border-bottom: 3px solid var(--accent); padding-bottom: 0.3em; }
h2 { font-size: 1.7em; color: #fff; margin: 2em 0 0.5em; padding-bottom: 0.2em; border-bottom: 1px solid var(--bg3); }
h3 { font-size: 1.3em; color: #ddd; margin: 1.5em 0 0.4em; }
h4 { font-size: 1.1em; color: #ccc; margin: 1.2em 0 0.3em; }
p { margin: 0.6em 0; }
ul, ol { margin: 0.5em 0 0.5em 1.5em; }
li { margin: 0.3em 0; }
img { max-width: 100%; height: auto; border-radius: 8px; margin: 1em 0; border: 1px solid var(--bg3); }
table { width: 100%; border-collapse: collapse; margin: 1em 0; }
th, td { border: 1px solid var(--bg3); padding: 10px 14px; text-align: left; }
th { background: var(--bg2); color: #fff; font-weight: 600; }
tr:nth-child(even) { background: rgba(255,255,255,0.03); }

/* ===== Navigation ===== */
.top-nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg2); border-bottom: 2px solid var(--accent);
  padding: 10px 16px; display: flex; align-items: center; gap: 10px;
  flex-wrap: wrap;
  min-height: var(--nav-h);
}
.top-nav a {
  padding: 6px 12px; background: var(--bg3); border-radius: 6px;
  font-size: 0.88em; white-space: nowrap;
  touch-action: manipulation; /* remove 300ms tap delay */
}
.top-nav a:hover, .top-nav a:active { background: var(--accent); color: #fff; text-decoration: none; }
.top-nav .title { font-weight: 700; color: var(--accent); margin-right: auto; font-size: 1.05em; }

/* TOC toggle button (mobile only) */
.toc-toggle {
  display: none;
  background: var(--bg3); border: none; color: #fff;
  font-size: 1.4em; padding: 4px 10px; border-radius: 6px;
  cursor: pointer; line-height: 1;
  touch-action: manipulation;
}
.toc-toggle:active { background: var(--accent); }

/* ===== Page TOC sidebar ===== */
.page-toc {
  position: fixed; left: 0; top: var(--nav-h); width: var(--sidebar-w);
  height: calc(100vh - var(--nav-h)); overflow-y: auto;
  background: var(--bg2); border-right: 1px solid var(--bg3);
  padding: 15px; font-size: 0.85em; z-index: 90;
  transition: transform 0.3s ease;
}
.page-toc h4 { color: var(--accent); margin-bottom: 8px; font-size: 1em; }
.page-toc ul { list-style: none; margin: 0; padding: 0; }
.page-toc li { margin: 2px 0; }
.page-toc a {
  display: block; padding: 6px 10px; border-radius: 4px; color: var(--text2);
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}
.page-toc a:hover, .page-toc a:active { background: var(--bg3); color: #fff; text-decoration: none; }
/* Overlay for mobile */
.page-toc-overlay {
  display: none; position: fixed; inset: 0; z-index: 85;
  background: rgba(0,0,0,0.5);
}
.page-toc-overlay.active { display: block; }

.main-content { margin-left: var(--sidebar-w); padding: 20px 40px 80px; max-width: 960px; }

/* ===== Code blocks ===== */
pre {
  background: var(--code-bg); border: 1px solid #30363d;
  border-radius: 8px; padding: 16px; overflow-x: auto;
  margin: 1em 0; font-size: 0.88em; line-height: 1.5;
  -webkit-overflow-scrolling: touch;
}
code { font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace; }
pre code { color: #c9d1d9; }
:not(pre) > code {
  background: var(--code-bg); padding: 2px 6px; border-radius: 4px;
  font-size: 0.88em; color: #f97583;
  word-break: break-all;
}
/* Syntax highlighting tokens */
.kw { color: #ff7b72; }
.ty { color: #79c0ff; }
.str { color: #a5d6ff; }
.num { color: #79c0ff; }
.cm { color: #8b949e; }
.fn { color: #d2a8ff; }
.op { color: #ff7b72; }
.attr { color: #79c0ff; }
.tag { color: #7ee787; }

/* ===== Callout boxes ===== */
.callout { border-radius: 8px; padding: 14px 18px; margin: 1em 0; border-left: 4px solid; }
.callout-title { font-weight: 700; margin-bottom: 6px; }
.callout.tip { background: var(--tip-bg); border-color: var(--tip-border); }
.callout.tip .callout-title { color: var(--tip-border); }
.callout.warn { background: var(--warn-bg); border-color: var(--warn-border); }
.callout.warn .callout-title { color: var(--warn-border); }
.callout.error { background: var(--err-bg); border-color: var(--err-border); }
.callout.error .callout-title { color: var(--err-border); }
.callout.info { background: var(--info-bg); border-color: var(--info-border); }
.callout.info .callout-title { color: var(--info-border); }

/* ===== Day badges ===== */
.day-badge {
  display: inline-block; padding: 4px 12px; border-radius: 20px;
  font-size: 0.8em; font-weight: 700; margin-right: 8px;
}
.day1 { background: #10b981; color: #fff; }
.day2 { background: #3b82f6; color: #fff; }
.day3 { background: #f59e0b; color: #000; }

/* ===== Module cards ===== */
.module-card {
  background: var(--bg2); border: 1px solid var(--bg3);
  border-radius: 12px; padding: 20px; margin: 14px 0;
  transition: border-color 0.2s;
}
.module-card:hover { border-color: var(--accent); }
.module-card h3 { margin-top: 0; }
.module-card .meta { color: var(--text2); font-size: 0.9em; margin: 8px 0; }

/* ===== Tables: mobile scroll wrapper ===== */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 1em 0;
  border-radius: 8px;
}
.table-scroll table { margin: 0; min-width: 500px; }
.compare-table th:first-child { width: 20%; }
.compare-table td:nth-child(2), .compare-table td:nth-child(3) { width: 40%; }

/* ===== Chapter nav at bottom ===== */
.chapter-nav {
  display: flex; justify-content: space-between; gap: 12px;
  margin: 3em 0 1em; padding-top: 1.5em; border-top: 1px solid var(--bg3);
}
.chapter-nav a {
  padding: 12px 16px; background: var(--bg2); border: 1px solid var(--bg3);
  border-radius: 8px; flex: 1; text-align: center;
  touch-action: manipulation;
}
.chapter-nav a:hover, .chapter-nav a:active { border-color: var(--accent); background: var(--bg3); text-decoration: none; }

/* ===== SVG diagrams ===== */
.diagram-container { text-align: center; margin: 1.5em 0; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.diagram-container svg { max-width: 100%; height: auto; }
.diagram-caption { color: var(--text2); font-size: 0.9em; margin-top: 8px; }

/* ===== Responsive: Tablet (≤900px) ===== */
@media (max-width: 900px) {
  .page-toc {
    transform: translateX(-100%);
    width: 280px; max-width: 80vw;
    box-shadow: 4px 0 20px rgba(0,0,0,0.4);
  }
  .page-toc.open { transform: translateX(0); }
  .toc-toggle { display: inline-block; }
  .main-content { margin-left: 0; padding: 16px 20px 80px; }
  .module-card { padding: 16px; }
}

/* ===== Responsive: Phone (≤600px) ===== */
@media (max-width: 600px) {
  :root { --nav-h: 48px; }
  body { font-size: 15px; line-height: 1.75; }

  h1 { font-size: 1.5em; margin: 0.4em 0 0.3em; }
  h2 { font-size: 1.3em; margin: 1.5em 0 0.4em; }
  h3 { font-size: 1.15em; }
  h4 { font-size: 1.05em; }

  .top-nav {
    padding: 8px 10px; gap: 6px;
    position: sticky; top: 0;
  }
  .top-nav .title { font-size: 0.95em; }
  .top-nav a { padding: 5px 10px; font-size: 0.82em; }

  .main-content { padding: 12px 14px 80px; }

  pre { font-size: 0.78em; padding: 12px 10px; border-radius: 6px; }
  :not(pre) > code { font-size: 0.82em; }

  th, td { padding: 8px 10px; font-size: 0.9em; }
  .table-scroll table { min-width: 420px; }

  ul, ol { margin-left: 1.2em; }
  li { margin: 0.2em 0; }

  .callout { padding: 12px 14px; }
  .module-card { padding: 14px; margin: 10px 0; border-radius: 10px; }

  .chapter-nav { flex-direction: column; gap: 10px; }
  .chapter-nav a { padding: 14px 16px; }

  .diagram-container { margin: 1em -6px; } /* bleed to edges for more width */

  img { margin: 0.6em 0; }
}

/* ===== Touch helpers ===== */
@media (hover: none) and (pointer: coarse) {
  /* Touch device: bigger tap targets */
  .top-nav a, .chapter-nav a, .page-toc a {
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .page-toc a { justify-content: flex-start; }
  a { min-height: 32px; display: inline-flex; align-items: center; }
  :not(pre) > code { padding: 3px 8px; }
}

/* ===== Print ===== */
@media print {
  .page-toc, .top-nav, .toc-toggle, .page-toc-overlay { display: none !important; }
  .main-content { margin-left: 0; }
  body { background: #fff; color: #000; }
  pre { border: 1px solid #ccc; }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--bg3); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ===== Safe area (notch phones) ===== */
@supports (padding: max(0px)) {
  .top-nav {
    padding-left: max(10px, env(safe-area-inset-left));
    padding-right: max(10px, env(safe-area-inset-right));
  }
  .main-content {
    padding-left: max(14px, env(safe-area-inset-left));
    padding-right: max(14px, env(safe-area-inset-right));
    padding-bottom: max(80px, calc(80px + env(safe-area-inset-bottom)));
  }
}