:root{
  /* =========================
     Minimal + accessible theme
     ========================= */

  /* Colors (colorblind-safe, high contrast) */
  --bg: #F8FAFC;
  --surface: #FFFFFF;
  --text: #0F172A;
  --muted: #475569;
  --border: #E2E8F0;

  --accent: #1D4ED8;
  --accent-hover: #1E40AF;

  --header-bg: #0B1220;
  --header-text: #FFFFFF;

  /* Typography */
  --font-body: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial,
               "Apple Color Emoji", "Segoe UI Emoji";
  --font-heading: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial,
                  "Apple Color Emoji", "Segoe UI Emoji";

  /* Sizing */
  --radius: 12px;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 40px;

  --container: 980px;
}

/* ================= Global Reset ================= */
*{ margin:0; padding:0; box-sizing:border-box; }
html, body { overflow-x: hidden; }
body{
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  display:flex;
  flex-direction:column;
  min-height:100vh;
}

/* Container */
.container{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* ================= Header (same as other pages) ================= */
.site-header{
  background: var(--header-bg);
  padding: 12px 0;
  box-shadow: 0 1px 0 rgba(255,255,255,0.08);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.header-inner{
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 12px;
}
.brand{
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--header-text);
  text-decoration:none;
  letter-spacing: 0.2px;
  transition: opacity 0.2s ease;
}
.brand:hover{ opacity: 0.88; }

.site-nav .nav-pill{
  list-style:none;
  display:flex;
  align-items:center;
  gap: 10px;
  padding: 6px 8px;
  margin: 0;
  border-radius: 9999px;
  background: rgba(255,255,255,0.06);
}
.site-nav .nav-pill a{
  color: var(--header-text);
  text-decoration:none;
  font-family: var(--font-heading);
  font-weight: 650;
  font-size: 0.95rem;
  padding: 8px 12px;
  border-radius: 9999px;
  opacity: 0.92;
  transition: background 0.2s ease, opacity 0.2s ease, transform 0.15s ease;
}
.site-nav .nav-pill a:hover{
  background: rgba(255,255,255,0.10);
  transform: translateY(-1px);
  opacity: 1;
}
.site-nav .nav-pill a:focus-visible{
  outline: 3px solid rgba(255,255,255,0.75);
  outline-offset: 2px;
}
.site-nav .nav-pill a.active{
  background: rgba(255,255,255,0.16);
  opacity: 1;
  outline: 1px solid rgba(255,255,255,0.18);
}

/* Mobile header */
@media (max-width: 768px){
  .header-inner{ flex-direction: column; gap: 10px; align-items:flex-start; }
  .site-nav .nav-pill{ flex-wrap: wrap; justify-content: center; padding: 6px 10px; }
  .site-nav .nav-pill a{ padding: 8px 12px; }
}

/* ================= Titles ================= */
.page-title{
  font-family: var(--font-heading);
  text-align:center;
  margin: var(--spacing-lg) auto var(--spacing-md);
  padding: 0 var(--spacing-sm);
  max-width: var(--container);
  font-weight: 850;
  font-size: clamp(1.9rem, 3.2vw, 2.4rem);
  letter-spacing: -0.01em;
}
.page-title::after{
  content:'';
  display:block;
  width: 96px;
  height: 2px;
  background: var(--border);
  margin: var(--spacing-xs) auto 0;
  border-radius: 999px;
}

/* ================= Cards ================= */
.card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
  max-width: var(--container);
  margin: 0 auto var(--spacing-md);
  padding: var(--spacing-md);
}

/* Text sizing for tutorial readability */
.card p, .card li{
  font-size: 1.05rem;
}

/* Links (underline on hover/focus so not color-only) */
a{
  color: var(--accent);
  text-decoration:none;
  position: relative;
}
a:hover{
  color: var(--accent-hover);
  text-decoration: underline;
  text-decoration-thickness: 2px;
}
a:focus-visible{
  outline: 3px solid rgba(29, 78, 216, 0.25);
  outline-offset: 3px;
  border-radius: 6px;
}

/* Lists */
.card ul, .card ol{
  max-width: 70ch;
  margin: 12px auto 0;
  padding-left: 1.3rem;
}
.card li{ margin-bottom: 0.7rem; }

/* Code blocks for templates */
pre{
  max-width: 70ch;
  margin: 12px auto 0;
  padding: 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  overflow: auto;

  background: #0B1220;
  color: #E5E7EB;
  line-height: 1.6;
  font-size: 0.92rem;
}
code{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
               "Liberation Mono","Courier New", monospace;
}

/* Inline code */
p code, li code{
  background: rgba(15, 23, 42, 0.06);
  color: var(--text);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.95em;
}

/* Optional callout blocks (you can add class="callout") */
.callout{
  max-width: 70ch;
  margin: 12px auto 0;
  padding: 12px 14px;
  border-left: 4px solid var(--accent);
  background: #F1F5F9;
  border-radius: 10px;
  color: var(--text);
}

/* ================= Footer ================= */
footer{
  margin-top:auto;
  border-top: 1px solid var(--border);
  background: var(--bg);
  color: var(--muted);
  text-align:center;
  padding: var(--spacing-md) 0;
}
.social-links a{
  color: var(--text);
  font-size: 1.5em;
  margin: 0 var(--spacing-xs);
  display:inline-block;
  opacity: 0.75;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.social-links a:hover,
.social-links a:focus{ transform: scale(1.1); opacity: 1; text-decoration:none; }

/* ================= Scroll progress bar ================= */
#scroll-progress{
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--accent);
  width: 0%;
  z-index: 9999;
  transition: width 0.15s ease-out;
}

/* ================= Fade-in (SAFE) ================= */
/* Visible by default (so the page never "goes white") */
.fade-in{
  opacity: 1;
  transform: none;
}

/* If JS adds <html class="js">, enable fade effect */
html.js .fade-in{
  opacity: 0;
  transform: translateY(16px);
  will-change: opacity, transform;
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
html.js .fade-in.visible{
  opacity: 1;
  transform: translateY(0);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  * { transition: none !important; animation: none !important; }
}

/* Keep everything contained on the viewport */
html, body {
  max-width: 100%;
  overflow-x: hidden;
}

/* Code blocks: wrap so they never force the page wider than the screen */
pre {
  max-width: 100%;
  overflow-x: hidden;                 /* no sideways overflow */
  white-space: pre-wrap;              /* keep line breaks but allow wrapping */
  word-break: break-word;             /* break long chunks */
  overflow-wrap: anywhere;            /* break very long URLs/strings */
}

/* Make sure <code> doesn't re-introduce nowrap */
pre code {
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
  display: block;
}

/* Also protect normal text (long links can break mobile too) */
p, li, a {
  overflow-wrap: anywhere;
  word-break: break-word;
}