/* ==========================================================================
   Almanac — warm-beige reference direction for learn-claude.
   Dark mode is a deliberate dusk taupe, not a near-black: it dims without
   going stark. Tokens are defined once and every rule reads from them.
   ========================================================================== */

:root{
  --bg:#F1E7D6; --bg-panel:#E8DAC0; --ink:#2B2117; --ink-soft:#6B5A45; --rule:#D2C0A0;
  --accent:#8A5A2B; --signal:#3F5D3A; --code-bg:#E9DEC7;
  --font-head: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", "Roboto Mono", Consolas, monospace;
  --topbar-h: 3.25rem;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#4A4136; --bg-panel:#56493B; --ink:#F3EAD9; --ink-soft:#C9BBA3; --rule:#6B5D4B;
    --accent:#D79A5C; --signal:#7FB37A; --code-bg:#55483A;
  }
}
:root[data-theme="dark"]{
  --bg:#4A4136; --bg-panel:#56493B; --ink:#F3EAD9; --ink-soft:#C9BBA3; --rule:#6B5D4B;
  --accent:#D79A5C; --signal:#7FB37A; --code-bg:#55483A;
}
:root[data-theme="light"]{
  --bg:#F1E7D6; --bg-panel:#E8DAC0; --ink:#2B2117; --ink-soft:#6B5A45; --rule:#D2C0A0;
  --accent:#8A5A2B; --signal:#3F5D3A; --code-bg:#E9DEC7;
}

*{ box-sizing:border-box; }
html{ background:var(--bg); }
body{
  margin:0; background:var(--bg); color:var(--ink); font-family:var(--font-body);
  line-height:1.65; font-size:clamp(15px, 14px + 0.4vw, 17px); -webkit-font-smoothing:antialiased;
  padding-top:var(--topbar-h);
}
::selection{ background:var(--accent); color:var(--bg); }
a{ color:var(--accent); }
a:hover{ text-decoration-thickness:2px; }
:focus-visible{ outline:2px solid var(--accent); outline-offset:2px; }
.visually-hidden{
  position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden;
  clip:rect(0,0,0,0); white-space:nowrap; border:0;
}

/* ---------------------------- top bar ---------------------------- */
.topbar{
  position:fixed; top:0; left:0; right:0; height:var(--topbar-h); z-index:60;
  display:flex; align-items:center; gap:.75rem; padding:0 1rem;
  background:var(--bg); border-bottom:1px solid var(--rule);
}
.topbar-brand{
  flex:1; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap;
  font-family:var(--font-head); font-weight:800; letter-spacing:-.01em;
  color:var(--ink); text-decoration:none; font-size:1rem;
}
.nav-toggle{
  position:relative; flex:none; display:flex; align-items:center; justify-content:center;
  width:2.2rem; height:2.2rem; padding:0; background:none; border:1px solid var(--rule); cursor:pointer;
}
.nav-toggle:hover{ border-color:var(--accent); }
.nav-toggle-bars{ position:relative; display:block; width:1.1rem; height:2px; background:var(--ink); }
.nav-toggle-bars::before, .nav-toggle-bars::after{
  content:""; position:absolute; left:0; width:1.1rem; height:2px; background:var(--ink);
}
.nav-toggle-bars::before{ top:-6px; }
.nav-toggle-bars::after{ top:6px; }

/* nav hides off the left edge until opened; a click on the backdrop, a nav
   link, or Escape closes it again (see the layout's inline script). */
.nav-backdrop{ position:fixed; inset:0; z-index:65; background:rgba(20, 15, 8, .4); }

/* ---------------------------- sidebar ---------------------------- */
.sidebar{
  position:fixed; top:0; left:0; height:100vh; width:clamp(240px, 80vw, 300px); z-index:70;
  overflow-y:auto; background:var(--bg); border-right:1px solid var(--rule);
  padding:calc(var(--topbar-h) + 1rem) clamp(1rem, 4vw, 1.3rem) 3rem;
  transform:translateX(-100%); transition:transform .22s ease;
  font-size:.86rem;
}
.sidebar.open{ transform:translateX(0); }
@media (prefers-reduced-motion: reduce){
  .sidebar{ transition:none; }
}
.stage{ margin-bottom:.2rem; border-bottom:1px solid var(--rule); }
.stage:last-of-type{ border-bottom:none; }
.stage-name{
  display:flex; align-items:center; gap:.4rem; cursor:pointer; list-style:none;
  font-size:.68rem; text-transform:uppercase; letter-spacing:.1em; color:var(--ink-soft);
  font-weight:700; padding:.7rem 0; user-select:none;
}
.stage-name::-webkit-details-marker{ display:none; }
.stage-name::before{
  content:"›"; display:inline-block; font-size:1rem; line-height:1; color:var(--ink-soft);
  transform:rotate(0deg); transition:transform .15s ease;
}
.stage[open] > .stage-name::before{ transform:rotate(90deg); }
.stage-name:hover{ color:var(--ink); }
.stage-name:hover::before{ color:var(--accent); }
.stage ul{ padding-bottom:.6rem; }
.sidebar ul{ list-style:none; margin:0; padding:0; }
.sidebar li a{
  display:block; padding:.3rem 0 .3rem .65rem; margin-left:-.65rem; color:var(--ink-soft);
  text-decoration:none; border-left:2px solid transparent; line-height:1.4;
}
.sidebar li a:hover{ color:var(--ink); }
.sidebar li a.current{ color:var(--ink); border-left-color:var(--accent); font-weight:600; background:var(--bg-panel); }

/* ---------------------------- content ---------------------------- */
.content{
  padding:clamp(2rem, 6vw, 3rem) clamp(1.25rem, 5vw, 3rem) clamp(3rem, 8vw, 6rem);
  /* was a fixed 720px, so laptop/desktop viewports left most of the screen
     empty on both sides. Now grows with the viewport, uncapped, so it keeps
     scaling on desktop and ultra-wide screens too. */
  max-width:75vw;
  margin:0 auto;
}
.eyebrow{
  font-family:var(--font-mono); font-size:.72rem; text-transform:uppercase; letter-spacing:.06em;
  color:var(--ink-soft); margin-bottom:1rem;
}

.content h1{ font-family:var(--font-head); font-weight:800; font-size:clamp(1.5rem, 1rem + 3vw, 1.9rem);
  letter-spacing:-.01em; border-bottom:2px solid var(--accent); padding-bottom:.6rem; margin:0 0 1.3rem;
  text-wrap:balance; }
.content h2{ font-family:var(--font-head); font-weight:700; font-size:clamp(1.15rem, 0.9rem + 1.5vw, 1.3rem);
  margin:2.2rem 0 .9rem; text-wrap:balance; }
.content h3{ font-family:var(--font-head); font-weight:700; font-size:clamp(1rem, 0.85rem + 0.8vw, 1.05rem);
  margin:1.7rem 0 .7rem; }

.content p{ margin:0 0 1.05rem; }
.content strong{ font-weight:700; }
.content ul, .content ol{ margin:0 0 1.1rem; padding-left:1.4rem; }
.content li{ margin-bottom:.35rem; }
.content li > ul, .content li > ol{ margin-top:.35rem; }

.content blockquote{
  margin:1.4rem 0; padding:.9rem 1.2rem; border-left:3px solid var(--accent);
  background:var(--bg-panel); color:var(--ink);
}
.content blockquote p:last-child{ margin-bottom:0; }

.content table{
  display:block; overflow-x:auto; -webkit-overflow-scrolling:touch;
  border-collapse:collapse; width:100%; margin:1.2rem 0; font-size:.88rem;
  font-variant-numeric:tabular-nums;
}
.content th, .content td{ border:1px solid var(--rule); padding:.55rem .75rem; text-align:left; vertical-align:top; }
.content th{ border-bottom:2px solid var(--ink-soft); text-transform:uppercase; font-size:.72rem; letter-spacing:.04em; color:var(--ink-soft); }
.content tr:nth-child(even) td{ background:var(--bg-panel); }

.content code{
  font-family:var(--font-mono); background:var(--code-bg); padding:.15em .35em;
  border-radius:2px; font-size:.86em;
}
.content pre{
  background:var(--code-bg); border:1px solid var(--rule); padding:1rem 1.1rem;
  overflow-x:auto; margin:1.2rem 0; line-height:1.55;
}
.content pre code{ background:none; padding:0; font-size:.85em; border-radius:0; }

.content hr{ border:none; border-top:1px solid var(--rule); margin:2.2rem 0; }
.content img{ max-width:100%; height:auto; }

/* callout-style paragraphs: any blockquote that starts a "Try it" / exercise
   block reads clearly enough with the accent border above; no extra markup
   needed since the source files use plain Markdown throughout. */

.page-nav{
  display:flex; justify-content:space-between; gap:1rem;
  margin-top:3rem; padding-top:1.5rem; border-top:1px solid var(--rule);
}
.page-nav-spacer{ flex:1; }
.page-nav-link{
  display:flex; flex-direction:column; gap:.3rem; max-width:46%;
  padding:.8rem 1rem; border:1px solid var(--rule); text-decoration:none;
}
.page-nav-link:hover{ border-color:var(--accent); }
.page-nav-label{
  font-family:var(--font-mono); font-size:.68rem; text-transform:uppercase;
  letter-spacing:.08em; color:var(--ink-soft);
}
.page-nav-title{ font-family:var(--font-head); font-weight:700; color:var(--ink); }
.page-nav-link:hover .page-nav-title{ color:var(--accent); }
.page-nav-prev{ text-align:left; }
.page-nav-prev .page-nav-title::before{ content:"← "; }
.page-nav-next{ text-align:right; margin-left:auto; align-items:flex-end; }
.page-nav-next .page-nav-title::after{ content:" →"; }

@media (max-width:640px){
  .page-nav{ flex-direction:column; }
  .page-nav-link, .page-nav-spacer{ max-width:none; }
  .page-nav-spacer{ display:none; }
  .page-nav-next{ text-align:left; align-items:flex-start; margin-left:0; }
  .page-nav-next .page-nav-title::after{ content:""; }
  .page-nav-next .page-nav-title::before{ content:"→ "; }
}

.page-footer{
  margin-top:3rem; padding-top:1.3rem; border-top:1px solid var(--rule);
  font-size:.82rem; color:var(--ink-soft);
}
.edit-link{ color:var(--ink-soft); }
.theme-toggle{
  flex:none; font:inherit; font-size:1rem; line-height:1; background:var(--bg-panel);
  border:1px solid var(--rule); color:var(--ink); width:2.2rem; height:2.2rem;
  cursor:pointer;
}
.theme-toggle:hover{ border-color:var(--accent); }

/* ---------------------------- syntax highlighting (rouge) ---------------------------- */
.highlight .c, .highlight .c1, .highlight .cm{ color:var(--ink-soft); font-style:italic; }
.highlight .k, .highlight .kd, .highlight .kn{ color:var(--accent); font-weight:600; }
.highlight .s, .highlight .s1, .highlight .s2{ color:var(--signal); }
.highlight .nt{ color:var(--accent); }
.highlight .na{ color:var(--ink-soft); }
.highlight .mi, .highlight .m{ color:var(--signal); }
.highlight .err{ background:none; }

/* ---------------------------- responsive ---------------------------- */
/* The nav is an off-canvas drawer at every width now, so there's no
   structural breakpoint left to handle — sizing above this line already
   scales continuously via clamp(). This just grows tap targets once
   navigation is touch-first rather than mouse-first. */
@media (max-width:800px){
  .stage-name{ padding:.85rem 0; }
  .sidebar li a{ padding:.55rem 0 .55rem .65rem; }
  .theme-toggle, .nav-toggle{ width:2.5rem; height:2.5rem; }
  .theme-toggle{ font-size:1.15rem; }
}