/* ---------- Themes: cream (default, dyslexia-friendly) + dark ---------- */
:root {
  --fs: 19px;
  --radius: 14px;
}

body[data-theme="cream"] {
  --bg: #f7f1e3;
  --bg2: #efe6d2;
  --panel: #fffdf7;
  --panel2: #faf4e6;
  --border: #d9cdb4;
  --text: #2f2a24;
  --text-dim: #6b6154;
  --accent: #a8005c;
  --accent2: #00606e;
  --good: #1c6b3f;
  --good-bg: #e4f3e9;
  --bad: #a11b1b;
  --bad-bg: #fbe8e6;
  --star: #8a5a00;
  --shadow: 0 2px 0 rgba(0,0,0,0.05), 0 6px 16px rgba(90,70,40,0.07);
}

body[data-theme="dark"] {
  --bg: #171526;
  --bg2: #1e1b30;
  --panel: #232038;
  --panel2: #2a2645;
  --border: #3b3560;
  --text: #ece9f8;
  --text-dim: #a49cc4;
  --accent: #ff7ad9;
  --accent2: #7de3f4;
  --good: #6ee7a0;
  --good-bg: rgba(110,231,160,0.10);
  --bad: #ff8a8a;
  --bad-bg: rgba(255,138,138,0.10);
  --star: #ffcf6b;
  --shadow: 0 2px 0 rgba(0,0,0,0.25), 0 8px 22px rgba(0,0,0,0.3);
}

body[data-font="lexend"] { --font: "Lexend", system-ui, sans-serif; }
body[data-font="atkinson"] { --font: "Atkinson Hyperlegible", system-ui, sans-serif; }
body[data-font="system"] { --font: -apple-system, "Segoe UI", system-ui, sans-serif; }

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: var(--fs);
  /* dyslexia-friendly text metrics */
  line-height: 1.7;
  letter-spacing: 0.012em;
  word-spacing: 0.06em;
  text-align: left;
}

/* ---------- Topbar ---------- */
#topbar {
  height: 74px;
  background: var(--bg2);
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  gap: 18px;
  flex-wrap: nowrap;
}

.brand { display: flex; flex-direction: column; line-height: 1.25; }
.brand-main { font-weight: 800; font-size: 0.95rem; letter-spacing: 0.08em; color: var(--accent); }
.brand-sub { font-size: 0.7rem; color: var(--text-dim); letter-spacing: 0.04em; }

.controls { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
.ctrl-group { display: flex; gap: 7px; align-items: center; }

.ctrl, .tab {
  font-family: var(--font);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 9px 14px;
  border-radius: 10px;
  border: 2px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  letter-spacing: 0.02em;
  transition: transform .08s ease, background .15s ease, border-color .15s ease;
  white-space: nowrap;
}
.ctrl:hover, .tab:hover { background: var(--panel2); border-color: var(--accent2); }
.ctrl:active, .tab:active { transform: translateY(1px); }
.ctrl.small { padding: 8px 11px; }
.ctrl.on { background: var(--accent); border-color: var(--accent); color: #fff; }
body[data-theme="dark"] .ctrl.on { color: #1a1626; }

.tab.active {
  background: var(--accent2);
  border-color: var(--accent2);
  color: #fff;
}
body[data-theme="dark"] .tab.active { color: #14121f; }
.tab .count { opacity: 0.75; font-weight: 700; margin-left: 3px; }

/* ---------- Layout ---------- */
#app { display: flex; height: calc(100vh - 74px); }

#sidebar {
  width: 320px;
  min-width: 320px;
  background: var(--bg2);
  border-right: 2px solid var(--border);
  padding: 16px 14px;
  overflow-y: auto;
}

#search {
  width: 100%;
  font-family: var(--font);
  font-size: 0.78rem;
  padding: 11px 14px;
  border-radius: 10px;
  border: 2px solid var(--border);
  background: var(--panel);
  color: var(--text);
  margin-bottom: 14px;
}
#search:focus { outline: none; border-color: var(--accent2); }

#progressBox { margin-bottom: 16px; }
.progress-label { font-size: 0.68rem; color: var(--text-dim); font-weight: 600; margin-bottom: 6px; }
.progress-track { height: 9px; background: var(--panel); border: 2px solid var(--border); border-radius: 99px; overflow: hidden; }
.progress-fill { height: 100%; width: 0%; background: var(--good); transition: width .3s ease; }
.link-btn {
  background: none; border: none; color: var(--text-dim);
  font-family: var(--font); font-size: 0.63rem; cursor: pointer;
  text-decoration: underline; padding: 5px 0 0 0;
}
.link-btn:hover { color: var(--accent); }

.nav-item {
  padding: 11px 13px;
  border-radius: 11px;
  margin-bottom: 7px;
  cursor: pointer;
  font-size: 0.76rem;
  line-height: 1.45;
  color: var(--text);
  background: var(--panel);
  border: 2px solid transparent;
  display: flex;
  gap: 9px;
  align-items: flex-start;
  transition: border-color .12s ease, transform .08s ease;
}
.nav-item:hover { border-color: var(--accent2); }
.nav-item.active { border-color: var(--accent); background: var(--panel2); font-weight: 600; }
.nav-item.done { opacity: 0.62; }
.nav-item.done .nav-text { text-decoration: line-through; text-decoration-thickness: 2px; }
.nav-num {
  font-weight: 800; font-size: 0.68rem; color: var(--accent2);
  min-width: 1.6em; flex-shrink: 0; padding-top: 0.1em;
}
.nav-item.done .nav-num { color: var(--good); }

/* ---------- Stage ---------- */
#stage { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
#cardWrap { flex: 1; overflow-y: auto; padding: 30px 46px 20px 46px; }

.card { max-width: 1040px; display: flex; flex-direction: column; gap: 20px; }

.card-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.pill {
  font-size: 0.64rem; font-weight: 800; letter-spacing: 0.1em;
  text-transform: uppercase; padding: 7px 14px; border-radius: 99px;
  border: 2px solid var(--accent); color: var(--accent);
}
.pill.star { border-color: var(--star); color: var(--star); }
.mark-btn {
  font-size: 0.66rem; font-weight: 700; padding: 8px 14px; border-radius: 99px;
  border: 2px solid var(--border); background: var(--panel); color: var(--text-dim);
  cursor: pointer; font-family: var(--font);
}
.mark-btn.on { background: var(--good-bg); border-color: var(--good); color: var(--good); }

.q-text {
  font-size: 1.02rem;
  color: var(--text-dim);
  font-weight: 500;
  max-width: 34em;
}

.headline {
  font-size: 2.05rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.005em;
  color: var(--text);
  max-width: 30em;
  border-left: 8px solid var(--accent);
  padding-left: 20px;
}

.bullets { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.bullets li {
  background: var(--panel);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 15px 20px;
  font-size: 0.94rem;
  line-height: 1.65;
  max-width: 62em;
  box-shadow: var(--shadow);
  display: flex; gap: 13px; align-items: flex-start;
}
.bullets li::before {
  content: "▸"; color: var(--accent2); font-weight: 800; flex-shrink: 0; font-size: 1.05em;
}
.bullets b, .headline b, .note b { color: var(--accent); font-weight: 700; }
body[data-theme="cream"] .bullets code,
body[data-theme="dark"] .bullets code,
code {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.1em 0.4em;
  font-size: 0.87em;
  font-family: var(--font);
  font-weight: 600;
  letter-spacing: 0;
}

.note {
  border-left: 8px solid var(--bad);
  background: var(--bad-bg);
  padding: 15px 20px;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.92rem;
  line-height: 1.6;
  max-width: 62em;
}
.note.keep { border-left-color: var(--good); background: var(--good-bg); }
.note-label { font-weight: 800; font-size: 0.66rem; letter-spacing: 0.1em; text-transform: uppercase; display: block; margin-bottom: 5px; }
.note .note-label { color: var(--bad); }
.note.keep .note-label { color: var(--good); }
.note.keep b { color: var(--good); }
.note b { color: var(--bad); }

/* diagram */
.diagram-box {
  background: var(--panel);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  position: relative;
  cursor: zoom-in;
  overflow-x: auto;
}
.diagram-box:hover { border-color: var(--accent2); }
.diagram-hint {
  position: absolute; top: 9px; right: 13px;
  font-size: 0.6rem; color: var(--text-dim); font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase;
}
.diagram-box svg { max-width: 100%; height: auto; display: block; margin: 0 auto; }

/* table */
.tbl-wrap { overflow-x: auto; border: 2px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
table { border-collapse: collapse; width: 100%; background: var(--panel); font-size: 0.85rem; }
th, td { text-align: left; padding: 13px 16px; border-bottom: 1px solid var(--border); line-height: 1.55; vertical-align: top; }
th { background: var(--panel2); font-weight: 800; font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent2); }
tbody tr:nth-child(even) { background: var(--panel2); }
tbody tr:hover { background: var(--bg2); }
tbody tr:last-child td { border-bottom: none; }

/* interactive layer stack */
.layers { display: grid; gap: 10px; }
.layer {
  background: var(--panel);
  border: 2px solid var(--border);
  border-left: 10px solid var(--accent2);
  border-radius: var(--radius);
  padding: 15px 20px;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform .1s ease, border-color .12s ease;
  max-width: 62em;
}
.layer:hover { transform: translateX(4px); border-color: var(--accent2); }
.layer.open { border-left-color: var(--accent); }
.layer-name { font-weight: 800; font-size: 1rem; display: flex; justify-content: space-between; gap: 12px; align-items: center; }
.layer-chev { color: var(--text-dim); font-size: 0.85em; }
.layer-what { font-size: 0.87rem; color: var(--text-dim); margin-top: 5px; line-height: 1.6; }
.layer-body { display: none; margin-top: 14px; padding-top: 14px; border-top: 2px dashed var(--border); font-size: 0.89rem; display: none; }
.layer.open .layer-body { display: block; }
.layer-row { margin-bottom: 10px; line-height: 1.62; }
.layer-row:last-child { margin-bottom: 0; }
.layer-tag { font-weight: 800; font-size: 0.66rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); display: block; }

/* script block */
.script-box {
  background: var(--panel);
  border: 2px solid var(--accent2);
  border-radius: var(--radius);
  padding: 20px 24px;
  box-shadow: var(--shadow);
  max-width: 60em;
  display: grid;
  gap: 14px;
}
.script-line { font-size: 1rem; line-height: 1.75; }
.script-line::first-letter { font-weight: 700; }

/* quiz mode */
.reveal-btn {
  font-family: var(--font); font-size: 0.95rem; font-weight: 700;
  padding: 20px 30px; border-radius: var(--radius);
  border: 3px dashed var(--accent); background: var(--panel);
  color: var(--accent); cursor: pointer; max-width: 40em;
  letter-spacing: 0.02em;
}
.reveal-btn:hover { background: var(--panel2); }
.hidden-until-reveal { display: none !important; }

/* footer nav */
#footerNav {
  height: 62px;
  border-top: 2px solid var(--border);
  background: var(--bg2);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 46px; gap: 16px; flex-shrink: 0;
}
#posIndicator { font-size: 0.7rem; color: var(--text-dim); font-weight: 700; letter-spacing: 0.05em; }

/* zoom modal */
.modal {
  position: fixed; inset: 0; z-index: 50;
  background: var(--bg);
  display: flex; flex-direction: column;
}
.modal.hidden { display: none; }
.modal-bar {
  height: 56px; flex-shrink: 0;
  background: var(--bg2); border-bottom: 2px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 18px; font-size: 0.68rem; color: var(--text-dim); font-weight: 600;
}
.modal-bar > div { display: flex; gap: 7px; }
#zoomCanvas { flex: 1; overflow: hidden; cursor: grab; display: flex; align-items: center; justify-content: center; }
#zoomCanvas.grabbing { cursor: grabbing; }
#zoomInner { transform-origin: center center; }
#zoomInner svg { max-width: none; }

::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 6px; border: 3px solid var(--bg2); }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }

@media (max-width: 1100px) {
  #sidebar { width: 250px; min-width: 250px; }
  #cardWrap { padding: 24px 26px; }
  .headline { font-size: 1.7rem; }
}