/* ============================================================
   Apple II Academy — global stylesheet
   Retro green-phosphor theme, tuned for readability.
   ============================================================ */

:root {
  --bg: #0b0f0c;
  --bg-panel: #101712;
  --bg-panel-2: #16211a;
  --border: #2a4a33;
  --border-bright: #3f7a4f;
  --green: #33ff66;
  --green-dim: #7ddf9a;
  --green-soft: #b9e8c6;
  --amber: #ffb347;
  --purple: #d38aff;
  --blue: #6fb8ff;
  --orange: #ff8a5c;
  --text: #d7e6da;
  --text-dim: #93a898;
  --code-bg: #0d1410;
  --max-width: 980px;
  --mono: "Menlo", "Consolas", "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  font-size: 16.5px;
}

/* subtle scanline overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0) 0px,
    rgba(0, 0, 0, 0) 3px,
    rgba(0, 0, 0, 0.12) 4px
  );
  z-index: 1000;
  opacity: 0.35;
}

a { color: var(--green); text-decoration: none; }
a:hover { color: var(--amber); text-decoration: underline; }

/* ---------- Header / nav ---------- */

header.site {
  border-bottom: 2px solid var(--border-bright);
  background: linear-gradient(180deg, #0e1510, #0b0f0c);
  padding: 0.9rem 1rem 0.7rem;
}

header.site .inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.logo {
  font-family: var(--mono);
  font-size: 1.35rem;
  color: var(--green);
  letter-spacing: 0.06em;
  text-shadow: 0 0 8px rgba(51, 255, 102, 0.55);
  display: inline-block;
  margin-bottom: 0.35rem;
}
.logo .rainbow { letter-spacing: 0; }
.logo .rainbow span { text-shadow: none; }
.logo .r1 { color: #61bb46; } .logo .r2 { color: #fdb827; }
.logo .r3 { color: #f5821f; } .logo .r4 { color: #e03a3e; }
.logo .r5 { color: #963d97; } .logo .r6 { color: #009ddc; }

nav.main { display: flex; flex-wrap: wrap; gap: 0.25rem 1.1rem; font-family: var(--mono); font-size: 0.92rem; }
nav.main a { color: var(--text-dim); padding: 0.15rem 0; }
nav.main a:hover { color: var(--green); text-decoration: none; }
nav.main a.active { color: var(--green); border-bottom: 2px solid var(--green); }

/* ---------- Layout ---------- */

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.2rem 4rem;
}

h1, h2, h3 {
  font-family: var(--mono);
  color: var(--green);
  line-height: 1.3;
  letter-spacing: 0.02em;
}
h1 { font-size: 1.9rem; text-shadow: 0 0 10px rgba(51,255,102,0.4); margin-top: 0; }
h2 { font-size: 1.35rem; margin-top: 2.6rem; border-bottom: 1px solid var(--border); padding-bottom: 0.35rem; }
h3 { font-size: 1.08rem; color: var(--green-dim); margin-top: 1.8rem; }

.kicker {
  font-family: var(--mono);
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.8rem;
  margin: 0 0 0.4rem;
}

.lede { font-size: 1.12rem; color: var(--green-soft); }

hr { border: none; border-top: 1px dashed var(--border); margin: 2.5rem 0; }

/* ---------- Cards ---------- */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.1rem 1.2rem;
  transition: border-color 0.2s, transform 0.15s;
}
.card:hover { border-color: var(--border-bright); transform: translateY(-2px); }
.card h3 { margin-top: 0; }
.card .num {
  font-family: var(--mono);
  color: var(--amber);
  font-size: 0.8rem;
  letter-spacing: 0.15em;
}
.card p { color: var(--text-dim); font-size: 0.95rem; margin-bottom: 0; }
a.cardlink { display: block; color: inherit; }
a.cardlink:hover { text-decoration: none; }

/* ---------- Code ---------- */

code {
  font-family: var(--mono);
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.08em 0.35em;
  font-size: 0.88em;
  color: var(--green-dim);
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-left: 4px solid var(--border-bright);
  border-radius: 6px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  line-height: 1.5;
}
pre code { background: none; border: none; padding: 0; font-size: 0.9rem; color: var(--green-soft); }

pre.screen {
  background: #030904;
  border: 8px solid #1a1a1a;
  border-radius: 10px;
  box-shadow: inset 0 0 30px rgba(51, 255, 102, 0.12), 0 0 0 1px #000;
}
pre.screen code { color: var(--green); text-shadow: 0 0 6px rgba(51,255,102,0.5); }

/* ---------- Tables ---------- */

.tablewrap { overflow-x: auto; margin: 1.2rem 0; }
table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.92rem;
}
th, td {
  border: 1px solid var(--border);
  padding: 0.45rem 0.7rem;
  text-align: left;
  vertical-align: top;
}
th {
  background: var(--bg-panel-2);
  font-family: var(--mono);
  color: var(--green-dim);
  font-weight: 600;
}
td code { white-space: nowrap; }
tbody tr:nth-child(odd) { background: rgba(255,255,255,0.02); }

/* ---------- Callouts ---------- */

.note, .warn, .try {
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-radius: 6px;
  padding: 0.8rem 1.1rem;
  margin: 1.3rem 0;
  background: var(--bg-panel);
  font-size: 0.97rem;
}
.note { border-left-color: var(--blue); }
.warn { border-left-color: var(--orange); }
.try  { border-left-color: var(--amber); }
.note strong:first-child, .warn strong:first-child, .try strong:first-child {
  font-family: var(--mono); letter-spacing: 0.05em;
}
.note strong:first-child { color: var(--blue); }
.warn strong:first-child { color: var(--orange); }
.try  strong:first-child { color: var(--amber); }

/* ---------- Diagrams ---------- */

figure.diagram {
  margin: 1.8rem 0;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.2rem;
  text-align: center;
}
figure.diagram svg { max-width: 100%; height: auto; }
figure.diagram figcaption {
  color: var(--text-dim);
  font-size: 0.88rem;
  margin-top: 0.8rem;
  text-align: left;
  border-top: 1px dashed var(--border);
  padding-top: 0.6rem;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 0.9rem;
}

button.ctl {
  font-family: var(--mono);
  background: var(--bg-panel-2);
  color: var(--green);
  border: 1px solid var(--border-bright);
  border-radius: 5px;
  padding: 0.4rem 1rem;
  font-size: 0.88rem;
  cursor: pointer;
  transition: background 0.15s;
}
button.ctl:hover { background: #1e3325; }
button.ctl:active { transform: translateY(1px); }
button.ctl[disabled] { opacity: 0.4; cursor: default; }

.anim-status {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--amber);
  min-height: 1.4em;
  margin-top: 0.6rem;
}

/* ---------- Exercises / quiz ---------- */

.exercise {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.1rem 1.3rem;
  margin: 1.4rem 0;
}
.exercise .ex-tag {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
  border: 1px solid var(--border-bright);
  color: var(--green);
  display: inline-block;
  margin-bottom: 0.5rem;
}
.exercise .ex-tag.hard { border-color: var(--orange); color: var(--orange); }
.exercise .ex-tag.med { border-color: var(--amber); color: var(--amber); }
.exercise h3 { margin-top: 0.2rem; }

details.solution {
  margin-top: 0.9rem;
  border: 1px dashed var(--border-bright);
  border-radius: 6px;
  padding: 0.5rem 0.9rem;
  background: var(--code-bg);
}
details.solution summary {
  cursor: pointer;
  font-family: var(--mono);
  color: var(--amber);
  font-size: 0.9rem;
  user-select: none;
}
details.solution[open] summary { margin-bottom: 0.5rem; }

.quiz-q { margin: 1.5rem 0; }
.quiz-q .q-text { font-weight: 600; color: var(--green-soft); }
.quiz-q label {
  display: block;
  padding: 0.4rem 0.8rem;
  margin: 0.3rem 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: border-color 0.15s;
}
.quiz-q label:hover { border-color: var(--border-bright); }
.quiz-q label.correct { border-color: var(--green); background: rgba(51,255,102,0.08); }
.quiz-q label.incorrect { border-color: var(--orange); background: rgba(255,138,92,0.08); }
.quiz-q .feedback { font-family: var(--mono); font-size: 0.85rem; margin-top: 0.3rem; min-height: 1.2em; }
.quiz-q .feedback.ok { color: var(--green); }
.quiz-q .feedback.no { color: var(--orange); }

/* ---------- Lecture footer nav ---------- */

.lecture-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3.5rem;
  border-top: 1px solid var(--border);
  padding-top: 1.2rem;
  font-family: var(--mono);
  font-size: 0.9rem;
}
.lecture-nav a { color: var(--green-dim); }

/* ---------- Footer ---------- */

footer.site {
  border-top: 1px solid var(--border);
  padding: 1.4rem 1.2rem 2.5rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  font-family: var(--mono);
}

/* ---------- Misc ---------- */

.pill-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1rem 0; }
.pill {
  font-family: var(--mono);
  font-size: 0.8rem;
  border: 1px solid var(--border-bright);
  border-radius: 999px;
  padding: 0.2rem 0.8rem;
  color: var(--green-dim);
}

kbd {
  font-family: var(--mono);
  background: #1c2620;
  border: 1px solid var(--border-bright);
  border-bottom-width: 3px;
  border-radius: 5px;
  padding: 0.05em 0.45em;
  font-size: 0.85em;
  color: var(--green-soft);
}

.blink { animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  h1 { font-size: 1.5rem; }
  main { padding: 1.4rem 0.9rem 3rem; }
}

/* ---- Back-link to the oldmachines collection hub ---- */
.main a.oldmachines-link{
  color: var(--text-dim);
  opacity: .72;
  margin-left: .4rem;
  padding-left: .9rem;
  border-left: 1px solid var(--border);
}
.main a.oldmachines-link:hover{
  color: var(--green);
  opacity: 1;
  text-decoration: none;
}

/* ---- Term palette (palette.js) theme mapping — Apple II green terminal ---- */
:root{
  --panel: var(--bg-panel);
  --panel-2: var(--bg-panel-2);
  --ground-2: var(--code-bg);
  --line: var(--border);
  --line-2: var(--border-bright);
  --ink: var(--text);
  --ink-2: var(--green-soft);
  --muted: var(--text-dim);
  --red: var(--green);
}