/* 1 Bit Pixel — How To. The app's "paper" theme: dark ink on warm off-white, monospace, clean. */
:root {
  --paper: #efece2;
  --paper-2: #e6e1d3;
  --ink: #26231e;
  --dim: #80796f;
  --line: #d9d3c4;
  --accent: #b25c1c;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { background: var(--paper); color: var(--ink); font-family: 'Share Tech Mono', monospace; line-height: 1.7; font-size: 15px; -webkit-font-smoothing: antialiased; }
a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--line); transition: all 0.12s ease; }
a:hover { border-bottom-color: var(--accent); color: var(--accent); }

.layout { display: flex; min-height: 100vh; max-width: 1080px; margin: 0 auto; }

.sidebar { width: 232px; flex-shrink: 0; border-right: 1px solid var(--line); padding: 28px 18px 40px; position: sticky; top: 0; height: 100vh; overflow-y: auto; }
.brand { font-family: 'VT323', monospace; font-size: 22px; line-height: 1.1; color: var(--ink); margin-bottom: 4px; }
.brand .sub { font-size: 12px; letter-spacing: 2px; color: var(--dim); font-family: 'Share Tech Mono', monospace; }
.langbar { display: flex; flex-wrap: wrap; gap: 4px; margin: 16px 0 22px; }
.langbar button { background: transparent; border: 1px solid var(--line); color: var(--dim); font-family: 'Share Tech Mono', monospace; font-size: 10.5px; letter-spacing: 0.5px; padding: 2px 6px; cursor: pointer; transition: all 0.12s ease; }
.langbar button:hover { color: var(--ink); border-color: var(--dim); }
.langbar button.active { color: var(--paper); background: var(--ink); border-color: var(--ink); }
nav { display: flex; flex-direction: column; gap: 2px; }
nav a, nav .soon { display: block; padding: 6px 10px; border: none; font-size: 14px; color: var(--ink); border-left: 2px solid transparent; transition: all 0.12s ease; }
nav a:hover { background: var(--paper-2); border-left-color: var(--dim); }
nav a.active { border-left-color: var(--accent); color: var(--accent); background: var(--paper-2); }
nav .soon { color: var(--dim); cursor: default; }
nav .soon em { font-style: normal; font-size: 10px; letter-spacing: 1px; border: 1px solid var(--line); padding: 0 4px; margin-left: 4px; color: var(--dim); }
.nav-sep { height: 1px; background: var(--line); margin: 14px 8px; }

main { flex: 1; min-width: 0; padding: 40px clamp(20px, 5vw, 56px) 72px; max-width: 760px; }
h1 { font-family: 'VT323', monospace; font-size: clamp(32px, 5.5vw, 46px); letter-spacing: 1px; color: var(--ink); line-height: 1; font-weight: normal; margin-bottom: 6px; }
.subtitle { font-size: 12px; letter-spacing: 3px; color: var(--dim); margin-bottom: 24px; }
.lead { font-size: 16px; margin-bottom: 8px; }
h2 { font-family: 'VT323', monospace; font-size: 26px; color: var(--ink); letter-spacing: 1px; margin: 40px 0 12px; font-weight: normal; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
h3 { font-family: 'VT323', monospace; font-size: 21px; color: var(--ink); letter-spacing: 0.5px; margin: 24px 0 4px; font-weight: normal; }
p { margin: 10px 0; }
ul { margin: 10px 0 10px 22px; }
li { margin: 4px 0; }
strong { color: var(--ink); font-weight: normal; border-bottom: 1px dotted var(--dim); }

.topics { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin: 18px 0; }
.topic { display: block; border: 1px solid var(--line); background: rgba(255,255,255,0.25); padding: 13px 15px; transition: all 0.12s ease; }
.topic:hover { background: rgba(255,255,255,0.55); border-color: var(--dim); }
.topic .t-name { font-family: 'VT323', monospace; font-size: 20px; color: var(--ink); }
.topic .t-desc { font-size: 12.5px; color: var(--dim); margin-top: 1px; line-height: 1.5; }

.gif-slot { margin: 14px 0; border: 1px dashed var(--dim); background: rgba(255,255,255,0.3); aspect-ratio: 16/9; display: flex; align-items: center; justify-content: center; text-align: center; color: var(--dim); font-size: 12px; letter-spacing: 1px; }
.gif-slot span { padding: 8px 14px; }

/* Progressive disclosure: short text stays visible, deeper detail + edge cases collapse. */
details { margin: 8px 0 4px; border-top: 1px solid var(--line); }
summary { cursor: pointer; list-style: none; padding: 8px 0 2px; color: var(--dim); font-size: 13px; letter-spacing: 0.5px; }
summary::-webkit-details-marker { display: none; }
summary::before { content: "[ + ] "; color: var(--accent); }
details[open] summary::before { content: "[ \2212 ] "; }
summary:hover { color: var(--ink); }
details .body { padding: 2px 0 8px; }
details .body ul { margin: 6px 0 6px 22px; }
details .body li { margin: 5px 0; font-size: 14px; }
.next { margin-top: 44px; }
.next a { border: 1px solid var(--line); padding: 9px 14px; }
.next a:hover { background: var(--paper-2); }

footer { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 11px; color: var(--dim); letter-spacing: 1px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

@media (max-width: 720px) {
  .layout { flex-direction: column; }
  .sidebar { width: auto; height: auto; position: static; border-right: none; border-bottom: 1px solid var(--line); padding: 20px 16px 14px; }
  nav { flex-flow: row wrap; gap: 4px; }
  nav a, nav .soon { border-left: none; border: 1px solid var(--line); padding: 4px 9px; font-size: 13px; }
  nav a.active { border-color: var(--accent); }
  .nav-sep { display: none; }
  main { padding: 28px 18px 56px; }
  .topics { grid-template-columns: 1fr; }
}