/* RBT Exam Prep — shared course stylesheet.
   Look: a clinic data sheet. Graph-paper ground, ink text, teal pen accent,
   gold tokens (the token board is the XP system). */

:root {
  color-scheme: light;
  --ground: #f5f7f4;
  --grid: #e3e8e2;
  --paper: #ffffff;
  --ink: #1b2530;
  --ink-soft: #4d5a66;
  --rule: #d3dad4;
  --accent: #17697f;
  --accent-soft: #dcecef;
  --token: #e2a92f;
  --token-ink: #5a3d00;
  --good: #2f7d4f;
  --good-soft: #e1f1e6;
  --bad: #b13e2f;
  --bad-soft: #f8e2de;
  --shadow: 0 1px 2px rgba(27, 37, 48, 0.06), 0 6px 18px rgba(27, 37, 48, 0.06);
  --font-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --font-body: "Atkinson Hyperlegible", "Verdana", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --ground: #11161b;
    --grid: #1a2128;
    --paper: #171e25;
    --ink: #e4e9ee;
    --ink-soft: #a2adb8;
    --rule: #2b3540;
    --accent: #62b6cf;
    --accent-soft: #1b3440;
    --token: #f0c35a;
    --token-ink: #2a1d00;
    --good: #6cc38f;
    --good-soft: #17301f;
    --bad: #ef8a7a;
    --bad-soft: #3a1c18;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 18px rgba(0, 0, 0, 0.25);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --ground: #11161b;
  --grid: #1a2128;
  --paper: #171e25;
  --ink: #e4e9ee;
  --ink-soft: #a2adb8;
  --rule: #2b3540;
  --accent: #62b6cf;
  --accent-soft: #1b3440;
  --token: #f0c35a;
  --token-ink: #2a1d00;
  --good: #6cc38f;
  --good-soft: #17301f;
  --bad: #ef8a7a;
  --bad-soft: #3a1c18;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 18px rgba(0, 0, 0, 0.25);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0;
  background-color: var(--ground);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--ink);
  font: 17px/1.6 var(--font-body);
  padding-inline: 16px;
}
a { color: var(--accent); text-underline-offset: 3px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.15; text-wrap: balance; margin: 0; }
h1 { font-size: clamp(1.9rem, 5vw, 2.6rem); font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: 1.45rem; font-weight: 650; margin-top: 2.2rem; }
h3 { font-size: 1.12rem; font-weight: 650; margin-top: 1.4rem; }
p, li { max-width: 65ch; }
code, .mono { font-family: var(--font-mono); font-size: 0.86em; }
.eyebrow {
  font: 600 0.72rem/1 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ---------- App shell ---------- */
.shell { max-width: 1080px; margin: 0 auto; padding-block: 20px 120px; display: grid; gap: 20px; }
.topbar {
  display: flex; flex-wrap: wrap; gap: 12px 20px; align-items: center; justify-content: space-between;
  background: var(--paper); border: 1px solid var(--rule); border-radius: 14px; padding: 14px 18px;
  box-shadow: var(--shadow);
}
.brand { display: flex; flex-direction: column; gap: 4px; }
.brand strong { font: 700 1.2rem/1 var(--font-display); }
.stats { display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center; }
.stat { display: flex; flex-direction: column; gap: 2px; }
.stat .v { font: 700 1.1rem/1 var(--font-mono); font-variant-numeric: tabular-nums; }
.stat .k { font: 600 0.66rem/1 var(--font-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-soft); }
.stat input[type="date"] {
  font: 600 0.85rem var(--font-mono); color: var(--ink); background: transparent;
  border: 1px solid var(--rule); border-radius: 6px; padding: 2px 4px;
}

/* Token board: 10 slots, a filled board = level up */
.tokenboard { display: flex; gap: 5px; align-items: center; }
.tokenboard .slot {
  width: 18px; height: 18px; border-radius: 50%;
  border: 2px dashed var(--rule); background: transparent;
}
.tokenboard .slot.on {
  border: 2px solid var(--token); background: var(--token);
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.18);
}
.tokenboard .slot.pop { animation: pop 0.45s ease-out; }
@keyframes pop { 0% { transform: scale(0.4); } 70% { transform: scale(1.25); } 100% { transform: scale(1); } }

.layout { display: grid; grid-template-columns: 250px 1fr; gap: 20px; align-items: start; }
@media (max-width: 820px) { .layout { grid-template-columns: 1fr; } }
.nav {
  background: var(--paper); border: 1px solid var(--rule); border-radius: 14px; padding: 14px;
  display: grid; gap: 14px; position: sticky; top: calc(env(safe-area-inset-top, 0px) + 12px);
}
@media (max-width: 820px) { .nav { position: static; } }
.nav h4 { margin: 0; font: 600 0.7rem/1 var(--font-mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-soft); }
.nav ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.nav a {
  display: flex; gap: 10px; align-items: baseline; text-decoration: none; color: var(--ink);
  padding: 7px 9px; border-radius: 8px; font-size: 0.95rem; line-height: 1.3;
}
.nav a .n { font: 600 0.72rem var(--font-mono); color: var(--ink-soft); }
.nav a:hover { background: var(--accent-soft); }
.nav a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); font-weight: 700; }
.nav .done::after { content: "✓"; margin-left: auto; color: var(--good); font-weight: 700; }

.mastery { display: grid; gap: 7px; }
.mastery .row { display: grid; grid-template-columns: 1.6rem 1fr 2.6rem; gap: 8px; align-items: center; font-size: 0.8rem; }
.mastery .row b { font-family: var(--font-mono); color: var(--accent); }
.mastery .bar { height: 7px; border-radius: 4px; background: var(--grid); overflow: hidden; }
.mastery .bar i { display: block; height: 100%; background: var(--accent); border-radius: 4px; transition: width 0.4s; }
.mastery .pct { font: 600 0.72rem var(--font-mono); text-align: right; color: var(--ink-soft); font-variant-numeric: tabular-nums; }

/* ---------- Lesson page ---------- */
.page {
  background: var(--paper); border: 1px solid var(--rule); border-radius: 14px;
  padding: clamp(18px, 4vw, 40px); box-shadow: var(--shadow); min-width: 0;
}
.page > * + * { margin-top: 1rem; }
.lede { font-size: 1.15rem; color: var(--ink-soft); }

/* Plain words + the technical term, side by side */
.term {
  display: grid; gap: 4px; border-left: 4px solid var(--accent); background: var(--accent-soft);
  padding: 12px 16px; border-radius: 0 10px 10px 0;
}
.term .t { font: 700 1rem var(--font-display); color: var(--accent); }
.term .plain { font-size: 0.98rem; }

.callout { border: 1px solid var(--rule); border-radius: 10px; padding: 14px 16px; background: var(--ground); }
.callout.warn { border-color: var(--token); }
.source { font-size: 0.82rem; color: var(--ink-soft); }
.cite { font: 600 0.7rem var(--font-mono); vertical-align: super; text-decoration: none; }

.tablewrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 0.93rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font: 600 0.72rem var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); }
td.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; text-align: right; }

/* Domain weight bars (exam map) */
.weights { display: grid; gap: 10px; }
.weights .w { display: grid; grid-template-columns: minmax(0, 15rem) 1fr 3.4rem; gap: 12px; align-items: center; }
@media (max-width: 560px) { .weights .w { grid-template-columns: 1fr 3.4rem; } .weights .w .track { grid-column: 1 / -1; grid-row: 2; } }
.weights .name { font-size: 0.93rem; line-height: 1.25; }
.weights .name b { font-family: var(--font-mono); color: var(--accent); margin-right: 6px; }
.weights .track { height: 16px; background: var(--grid); border-radius: 4px; overflow: hidden; }
.weights .track i { display: block; height: 100%; background: var(--accent); }
.weights .n { font: 700 0.9rem var(--font-mono); text-align: right; font-variant-numeric: tabular-nums; }

.nextprev { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; border-top: 1px solid var(--rule); padding-top: 16px; margin-top: 2rem; }
.asktip { font-size: 0.9rem; color: var(--ink-soft); }

/* ---------- Buttons ---------- */
.btn {
  font: 700 0.95rem var(--font-body); border-radius: 10px; padding: 10px 16px; cursor: pointer;
  border: 1px solid var(--accent); background: var(--accent); color: var(--paper);
}
.btn.ghost { background: transparent; color: var(--accent); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---------- Quiz ---------- */
.quiz { border: 2px solid var(--ink); border-radius: 14px; padding: clamp(14px, 3vw, 24px); background: var(--paper); display: grid; gap: 14px; }
.quiz .qhead { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; align-items: center; }
.quiz .progress { height: 6px; background: var(--grid); border-radius: 3px; overflow: hidden; }
.quiz .progress i { display: block; height: 100%; background: var(--token); transition: width 0.3s; }
.quiz .qtext { font: 600 1.08rem/1.45 var(--font-body); }
.quiz .choices { display: grid; gap: 8px; }
.quiz .choice {
  text-align: left; font: 1rem/1.4 var(--font-body); color: var(--ink); background: var(--ground);
  border: 1px solid var(--rule); border-radius: 10px; padding: 12px 14px; cursor: pointer;
  display: grid; grid-template-columns: 1.6rem 1fr; gap: 8px;
}
.quiz .choice .k { font: 700 0.85rem var(--font-mono); color: var(--ink-soft); }
.quiz .choice:hover:not(:disabled) { border-color: var(--accent); }
.quiz .choice:disabled { cursor: default; }
.quiz .choice.right { background: var(--good-soft); border-color: var(--good); }
.quiz .choice.wrong { background: var(--bad-soft); border-color: var(--bad); }
.quiz .feedback { border-radius: 10px; padding: 12px 14px; display: grid; gap: 6px; }
.quiz .feedback.right { background: var(--good-soft); }
.quiz .feedback.wrong { background: var(--bad-soft); }
.quiz .feedback strong { font-family: var(--font-display); }
.quiz .actions { display: flex; gap: 10px; flex-wrap: wrap; }
.quiz .score { font: 700 2.4rem/1 var(--font-mono); font-variant-numeric: tabular-nums; }
.quiz .toast { font: 700 0.85rem var(--font-mono); color: var(--token-ink); background: var(--token); padding: 3px 8px; border-radius: 999px; }

/* ---------- Tutor chat ---------- */
.tutor-fab {
  position: fixed; right: 16px; bottom: calc(16px + env(safe-area-inset-bottom, 0px)); z-index: 20;
  box-shadow: var(--shadow); border-radius: 999px; padding: 12px 18px;
}
.tutor {
  position: fixed; right: 16px; bottom: calc(16px + env(safe-area-inset-bottom, 0px)); z-index: 30;
  width: min(420px, calc(100vw - 32px)); height: min(560px, calc(100vh - 120px));
  background: var(--paper); border: 1px solid var(--rule); border-radius: 16px; box-shadow: var(--shadow);
  display: grid; grid-template-rows: auto 1fr auto;
}
.tutor header { display: flex; justify-content: space-between; align-items: center; padding: 12px 14px; border-bottom: 1px solid var(--rule); }
.tutor header strong { font-family: var(--font-display); }
.tutor .log { overflow-y: auto; padding: 14px; display: grid; gap: 10px; align-content: start; }
.tutor .msg { padding: 10px 12px; border-radius: 12px; font-size: 0.95rem; line-height: 1.5; white-space: pre-wrap; max-width: 92%; }
.tutor .msg.user { background: var(--accent); color: var(--paper); justify-self: end; }
.tutor .msg.bot { background: var(--ground); border: 1px solid var(--rule); justify-self: start; }
.tutor .msg.note { font-size: 0.82rem; color: var(--ink-soft); background: transparent; padding: 0; }
.tutor form { display: flex; gap: 8px; padding: 10px; border-top: 1px solid var(--rule); }
.tutor textarea {
  flex: 1; resize: none; font: 0.95rem/1.4 var(--font-body); color: var(--ink); background: var(--ground);
  border: 1px solid var(--rule); border-radius: 10px; padding: 8px 10px; min-height: 44px; max-height: 120px;
}
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { font: 0.8rem var(--font-body); border: 1px solid var(--rule); background: var(--paper); color: var(--ink); border-radius: 999px; padding: 5px 10px; cursor: pointer; }

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }