/* ==========================================================================
   NICUniversity — shared styles
   Evolved from NICU Tutor: same warm palette, plus timetable, read-aloud,
   vocabulary popovers, Professor Mode, and note-taking cues.
   ========================================================================== */

:root {
  --bg: #fff8f0;
  --card: #ffffff;
  --ink: #2d3142;
  --ink-soft: #565d75;
  --teal: #0e7c7b;
  --teal-dark: #0a5958;
  --teal-pale: #e0f2f1;
  --coral: #f25f5c;
  --coral-pale: #ffe8e7;
  --sunny: #ffb627;
  --sunny-pale: #fff3d6;
  --sky: #3f88c5;
  --sky-pale: #e3eff9;
  --violet: #7768ae;
  --violet-pale: #ece8f6;
  --green: #2a9d3f;
  --green-pale: #e2f4e5;
  --pink: #d64d8a;
  --pink-pale: #fbe4ef;
  --orange: #e8792b;
  --orange-pale: #fdebdc;
  --brown: #8a5a33;
  --brown-pale: #f1e6dc;
  --navy: #2d3142;
  --line: #efe3d3;
  --radius: 18px;
  --shadow: 0 3px 14px rgba(64, 45, 20, 0.09);
  --font-head: ui-rounded, "Avenir Next", "Trebuchet MS", "Segoe UI", system-ui, sans-serif;
  --font-body: "Avenir Next", "Segoe UI", system-ui, -apple-system, sans-serif;
}

/* course colors — used by timetable cards, page kickers, and badges */
.c-seminar   { --course: var(--violet); --course-pale: var(--violet-pale); }
.c-chemistry { --course: var(--coral);  --course-pale: var(--coral-pale); }
.c-biology   { --course: var(--green);  --course-pale: var(--green-pale); }
.c-physics   { --course: var(--sky);    --course-pale: var(--sky-pale); }
.c-calculus  { --course: #c8871a;       --course-pale: var(--sunny-pale); }
.c-statistics{ --course: var(--teal);   --course-pale: var(--teal-pale); }
.c-genetics  { --course: var(--pink);   --course-pale: var(--pink-pale); }
.c-psychology{ --course: var(--orange); --course-pale: var(--orange-pale); }
.c-sociology { --course: var(--brown);  --course-pale: var(--brown-pale); }
.c-general   { --course: var(--navy);   --course-pale: #e6e7ee; }

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.06rem;
  line-height: 1.65;
}

.wrap { max-width: 780px; margin: 0 auto; padding: 0 20px 60px; }
.wrap-wide { max-width: 1080px; }

/* ---------- top bar ---------- */
.topbar {
  background: var(--teal);
  color: #fff;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.topbar a, .topbar button {
  color: #fff;
  text-decoration: none;
  font-family: var(--font-head);
  font-weight: 700;
  background: none;
  border: none;
  font-size: 0.95rem;
  cursor: pointer;
}
.topbar .brand { font-size: 1.15rem; display: flex; align-items: center; gap: 8px; }
.topbar nav { display: flex; gap: 18px; align-items: center; flex-wrap: wrap; }
.topbar nav a:hover, .topbar nav button:hover { text-decoration: underline; }
.topbar .prof-toggle {
  border: 2px solid rgba(255,255,255,0.6);
  border-radius: 999px;
  padding: 3px 12px;
}
body.prof .topbar .prof-toggle { background: var(--sunny); color: var(--ink); border-color: var(--sunny); }

/* ---------- type ---------- */
h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.25; }
h1 { font-size: 2.1rem; margin: 26px 0 8px; color: var(--teal-dark); }
h2 {
  font-size: 1.5rem; margin: 44px 0 14px; color: var(--teal-dark);
  display: flex; align-items: center; gap: 10px;
}
h3 { font-size: 1.15rem; margin: 26px 0 8px; }
p { margin: 0 0 16px; }
ul, ol { margin: 0 0 16px 26px; }
li { margin-bottom: 8px; }
a { color: var(--sky); }
.lede { font-size: 1.18rem; color: var(--ink-soft); margin-bottom: 22px; }
.kicker {
  font-family: var(--font-head); font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.09em; font-size: 0.8rem; color: var(--course, var(--coral)); margin-top: 30px;
}
.center { text-align: center; }
.muted { color: var(--ink-soft); }

/* ---------- hero ---------- */
.hero { display: flex; gap: 28px; align-items: center; margin: 10px 0 8px; flex-wrap: wrap; }
.hero .hero-art { flex: 0 0 240px; max-width: 240px; }
.hero .hero-art svg { width: 100%; height: auto; display: block; }
.hero .hero-text { flex: 1 1 320px; }

/* ---------- cards & boxes ---------- */
.card {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 22px 24px; margin: 20px 0;
}
.box { border-radius: var(--radius); padding: 18px 22px; margin: 20px 0; }
.box .box-title {
  font-family: var(--font-head); font-weight: 700; display: flex; align-items: center;
  gap: 8px; margin-bottom: 8px;
}
.box p:last-child, .box ul:last-child, .box ol:last-child { margin-bottom: 0; }
.box-try   { background: var(--sunny-pale);  border-left: 6px solid var(--sunny); }
.box-real  { background: var(--coral-pale);  border-left: 6px solid var(--coral); }
.box-fun   { background: var(--sky-pale);    border-left: 6px solid var(--sky); }
.box-words { background: var(--violet-pale); border-left: 6px solid var(--violet); }
.box-team  { background: var(--green-pale);  border-left: 6px solid var(--green); }
.box-more  { background: var(--teal-pale);   border-left: 6px solid var(--teal); }
.box-flash { background: #fdf3e2; border-left: 6px solid var(--orange); }
.box-flash .box-title { color: #a8531a; }
.box-flash a { color: #a8531a; font-weight: 600; }

/* "Write this down" note cue */
.cue {
  display: flex; gap: 12px; align-items: flex-start;
  background: #fffdf5; border: 2px dashed var(--sunny); border-radius: 14px;
  padding: 12px 16px; margin: 18px 0;
}
.cue .cue-icon { font-size: 1.4rem; line-height: 1.2; }
.cue .cue-label {
  font-family: var(--font-head); font-weight: 700; font-size: 0.8rem;
  text-transform: uppercase; letter-spacing: 0.08em; color: #b07a11; display: block;
}
.cue p { margin: 2px 0 0; font-weight: 600; }

/* warm-up (spaced repetition) */
.warmup {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 20px 24px; margin: 26px 0; border-top: 8px solid var(--orange);
}
.warmup h2 { margin-top: 0; font-size: 1.25rem; }
.warmup .wq { margin: 14px 0 0; }
.warmup .wq-q { font-weight: 700; font-family: var(--font-head); margin-bottom: 8px; }
.warmup details { margin-top: 6px; }
.warmup summary {
  cursor: pointer; font-family: var(--font-head); font-weight: 700; color: var(--teal-dark);
  list-style: none; display: inline-block; background: var(--teal-pale);
  border-radius: 999px; padding: 4px 14px;
}
.warmup summary::-webkit-details-marker { display: none; }
.warmup details[open] summary { background: var(--green-pale); color: var(--green); }
.warmup .wq-a { margin-top: 8px; padding: 10px 14px; background: var(--bg); border-radius: 10px; }

/* ---------- figures & tables ---------- */
figure.diagram {
  margin: 26px 0; background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 18px; text-align: center;
}
figure.diagram svg { max-width: 100%; height: auto; }
figure.diagram figcaption { font-size: 0.92rem; color: var(--ink-soft); margin-top: 10px; }

.table-scroll { overflow-x: auto; margin: 20px 0; }
table.numbers {
  border-collapse: collapse; width: 100%; background: var(--card);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); font-size: 0.98rem;
}
table.numbers th, table.numbers td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--line); }
table.numbers th { background: var(--teal); color: #fff; font-family: var(--font-head); }
table.numbers tr:last-child td { border-bottom: none; }
table.numbers td:first-child { font-weight: 600; }

dl.words dt { font-family: var(--font-head); font-weight: 700; color: var(--violet); margin-top: 12px; }
dl.words dd { margin-left: 0; }

/* ---------- vocabulary popovers ---------- */
.vocab {
  border-bottom: 2px dotted var(--violet);
  cursor: help;
  text-decoration: none;
  color: inherit;
}
.vocab:hover { background: var(--violet-pale); }
.vocab-pop {
  position: absolute; z-index: 50; max-width: 320px;
  background: var(--card); border: 2px solid var(--violet); border-radius: 14px;
  box-shadow: 0 8px 26px rgba(64,45,20,0.18); padding: 12px 14px 12px; font-size: 0.97rem;
}
.vocab-pop .vp-word { font-family: var(--font-head); font-weight: 700; color: var(--violet); display: flex; align-items: center; gap: 8px; }
.vocab-pop .vp-say { font-size: 0.85rem; color: var(--ink-soft); font-weight: 400; }
.vocab-pop .vp-def { margin: 6px 0 0; }
.vocab-pop button {
  font: inherit; font-size: 0.85rem; background: var(--violet-pale); border: none;
  border-radius: 999px; padding: 2px 10px; cursor: pointer; margin-left: auto;
}
.vocab-pop .vp-close { position: absolute; top: 4px; right: 8px; background: none; font-size: 1.1rem; color: var(--ink-soft); padding: 0 4px; }

/* ---------- read-aloud ---------- */
.readable { position: relative; }
.say-btn {
  position: absolute; left: -44px; top: 2px;
  width: 30px; height: 30px; border-radius: 50%; border: 2px solid var(--line);
  background: var(--card); cursor: pointer; font-size: 0.95rem; line-height: 1;
  display: flex; align-items: center; justify-content: center; color: var(--ink-soft);
  opacity: 0.55; transition: opacity 0.15s ease, border-color 0.15s ease;
}
li.readable .say-btn, dd.readable .say-btn { left: -60px; }
.box .readable .say-btn, .warmup .readable .say-btn, .card .readable .say-btn, .cue .readable .say-btn { left: -66px; }
.readable:hover .say-btn, .say-btn:focus { opacity: 1; border-color: var(--teal); }
.readable.speaking { background: var(--sunny-pale); border-radius: 10px; box-shadow: 0 0 0 6px var(--sunny-pale); }
.readable.speaking .say-btn { opacity: 1; border-color: var(--sunny); background: var(--sunny); color: var(--ink); }
.read-controls {
  display: flex; gap: 10px; align-items: center; flex-wrap: wrap;
  background: var(--card); border-radius: 999px; box-shadow: var(--shadow);
  padding: 8px 10px 8px 16px; margin: 14px 0 4px; font-size: 0.92rem; color: var(--ink-soft);
}
.read-controls button, .read-controls select {
  font: inherit; font-family: var(--font-head); font-weight: 700; font-size: 0.9rem;
  border: none; border-radius: 999px; padding: 6px 14px; cursor: pointer;
  background: var(--teal-pale); color: var(--teal-dark);
}
.read-controls button.primary { background: var(--teal); color: #fff; }
.read-controls select { background: var(--bg); font-weight: 600; }
.read-controls .no-speech { color: var(--coral); }
@media (max-width: 900px) {
  .say-btn { position: static; display: inline-flex; width: 26px; height: 26px; margin-right: 8px; vertical-align: middle; float: left; margin-top: 3px; }
}

/* ---------- timetable ---------- */
.week-label {
  font-family: var(--font-head); font-weight: 700; color: var(--ink-soft);
  font-size: 0.95rem; margin: 6px 0 12px;
}
.timetable {
  display: grid;
  grid-template-columns: repeat(5, minmax(180px, 1fr));
  gap: 14px;
  margin: 14px 0 26px;
}
.day { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px; }
.day h3 {
  margin: 0 0 12px; text-align: center; font-size: 1.05rem; color: var(--teal-dark);
  border-bottom: 2px solid var(--line); padding-bottom: 8px;
}
.slot {
  display: block; text-decoration: none; color: var(--ink);
  border-left: 6px solid var(--course, var(--ink-soft));
  background: var(--course-pale, var(--bg));
  border-radius: 12px; padding: 10px 12px; margin-bottom: 10px;
  position: relative; transition: transform 0.12s ease;
}
.slot:hover { transform: translateX(3px); }
.slot > span { display: block; }
.slot .slot-time { font-family: var(--font-head); font-size: 0.78rem; font-weight: 700; color: var(--ink-soft); }
.slot .slot-title { font-family: var(--font-head); font-weight: 700; font-size: 0.98rem; line-height: 1.3; }
.slot .slot-sub { font-size: 0.85rem; color: var(--ink-soft); }
.slot .slot-status { font-family: var(--font-head); font-size: 0.8rem; font-weight: 700; margin-top: 4px; display: block; }
.slot.done .slot-status { color: var(--green); }
.slot.next { box-shadow: 0 0 0 3px var(--sunny); }
.slot.next .slot-status { color: #b07a11; }
.slot.locked { opacity: 0.55; pointer-events: none; }
.slot.locked .slot-status { color: var(--ink-soft); }
.slot.soon { opacity: 0.5; pointer-events: none; background: repeating-linear-gradient(45deg, #fff, #fff 6px, var(--bg) 6px, var(--bg) 12px); }
body.prof .slot.locked { opacity: 1; pointer-events: auto; }
@media (max-width: 960px) { .timetable { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); } }

/* ---------- badge strip / transcript ---------- */
.badge-shelf {
  display: flex; gap: 10px; flex-wrap: wrap; align-items: center;
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 14px 20px; margin: 18px 0;
}
.badge-shelf .shelf-label { font-family: var(--font-head); font-weight: 700; color: var(--ink-soft); margin-right: 6px; }
.badge-shelf .shelf-badge { font-size: 1.7rem; }
.badge-shelf .shelf-badge.locked { filter: grayscale(1) opacity(0.25); }

table.transcript { width: 100%; }
table.transcript .stamp { font-size: 1.3rem; }
table.transcript .none { color: var(--ink-soft); font-style: italic; font-weight: 400; }

/* ---------- quiz ---------- */
.quiz-zone {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 26px 26px 30px; margin: 30px 0; border-top: 8px solid var(--sunny);
}
.quiz-zone h2 { margin-top: 0; }
.quiz-tools { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin: 0 0 16px; font-size: 0.92rem; }
.quiz-tools a, .quiz-tools button {
  font: inherit; font-family: var(--font-head); font-weight: 700; font-size: 0.88rem;
  text-decoration: none; border: 2px solid var(--line); background: var(--bg); color: var(--ink);
  border-radius: 999px; padding: 5px 14px; cursor: pointer;
}
.quiz-tools a:hover, .quiz-tools button:hover { border-color: var(--teal); }
.prof-only { display: none !important; }
body.prof .prof-only { display: initial !important; }
body.prof .quiz-tools .prof-only { display: inline-block !important; }
body.prof .prof-panel.prof-only { display: block !important; }
.prof-panel {
  background: var(--sunny-pale); border: 2px solid var(--sunny); border-radius: 14px;
  padding: 14px 18px; margin: 0 0 18px;
}
.prof-panel h4 { margin: 0 0 8px; font-size: 1rem; }
.prof-panel ol { margin-bottom: 10px; }
.prof-panel label { font-weight: 600; }
.prof-panel input[type=number] {
  font: inherit; width: 70px; padding: 5px 8px; border: 2px solid var(--line); border-radius: 8px; margin: 0 8px;
}
.prof-panel button {
  font: inherit; font-family: var(--font-head); font-weight: 700; background: var(--teal); color: #fff;
  border: none; border-radius: 999px; padding: 7px 18px; cursor: pointer;
}
.prof-panel .key-list li { margin-bottom: 4px; }

.quiz-progress { font-family: var(--font-head); font-weight: 700; color: var(--ink-soft); font-size: 0.9rem; margin-bottom: 12px; }
.quiz-q { font-family: var(--font-head); font-weight: 700; font-size: 1.15rem; margin-bottom: 16px; }
.quiz-choices { display: flex; flex-direction: column; gap: 10px; }
.quiz-choice {
  text-align: left; font: inherit; background: var(--bg); border: 2px solid var(--line);
  border-radius: 12px; padding: 12px 16px; cursor: pointer; transition: border-color 0.12s ease, background 0.12s ease;
}
.quiz-choice:hover:not(:disabled) { border-color: var(--teal); background: var(--teal-pale); }
.quiz-choice:disabled { cursor: default; }
.quiz-choice.correct { border-color: var(--green); background: var(--green-pale); font-weight: 600; }
.quiz-choice.wrong { border-color: var(--coral); background: var(--coral-pale); }
.quiz-explain { margin-top: 16px; padding: 14px 18px; border-radius: 12px; background: var(--sky-pale); border-left: 5px solid var(--sky); }
.quiz-explain .qe-verdict { font-family: var(--font-head); font-weight: 700; margin-bottom: 6px; }
.quiz-explain.good .qe-verdict { color: var(--green); }
.quiz-explain.bad .qe-verdict { color: var(--coral); }
.quiz-next {
  margin-top: 18px; font: inherit; font-family: var(--font-head); font-weight: 700;
  background: var(--teal); color: #fff; border: none; border-radius: 999px; padding: 12px 30px; cursor: pointer; font-size: 1rem;
}
.quiz-next:hover { background: var(--teal-dark); }
.quiz-result { text-align: center; padding: 10px 0; }
.quiz-result .qr-emoji { font-size: 3.2rem; }
.quiz-result h3 { font-size: 1.5rem; color: var(--teal-dark); }
.quiz-result p { color: var(--ink-soft); }
.quiz-result .quiz-next { margin: 8px 6px 0; }
.quiz-result .quiz-retry { background: var(--coral); }
.quiz-result .quiz-retry:hover { background: #d94b48; }

/* ---------- recitation pages ---------- */
.hw-steps { counter-reset: step; list-style: none; margin-left: 0; }
.hw-steps li {
  position: relative; padding-left: 48px; margin-bottom: 14px;
}
.hw-steps li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: 0; width: 34px; height: 34px; border-radius: 50%;
  background: var(--course, var(--teal)); color: #fff; font-family: var(--font-head); font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.print-links { display: flex; gap: 10px; flex-wrap: wrap; margin: 12px 0 4px; }
.print-links a {
  font-family: var(--font-head); font-weight: 700; text-decoration: none; color: var(--ink);
  background: var(--card); border: 2px solid var(--line); border-radius: 999px; padding: 8px 16px;
}
.print-links a:hover { border-color: var(--teal); }
.print-links a.key { background: var(--sunny-pale); border-color: var(--sunny); }

/* ---------- nav & footer ---------- */
.lesson-nav { display: flex; justify-content: space-between; gap: 14px; margin: 40px 0 10px; flex-wrap: wrap; }
.lesson-nav a {
  font-family: var(--font-head); font-weight: 700; text-decoration: none; color: var(--teal-dark);
  background: var(--card); border-radius: 999px; box-shadow: var(--shadow); padding: 11px 22px;
}
.lesson-nav a:hover { background: var(--teal-pale); }
.footer-note { margin-top: 46px; padding-top: 18px; border-top: 2px solid var(--line); color: var(--ink-soft); font-size: 0.92rem; }
.pill {
  display: inline-block; font-family: var(--font-head); font-weight: 700; font-size: 0.82rem;
  background: var(--course-pale, var(--teal-pale)); color: var(--course, var(--teal-dark));
  border-radius: 999px; padding: 3px 12px; margin-right: 6px;
}
.toast {
  position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: #fff; padding: 12px 22px; border-radius: 999px;
  font-family: var(--font-head); font-weight: 700; box-shadow: 0 8px 26px rgba(0,0,0,0.25); z-index: 100;
}

@media (max-width: 560px) {
  h1 { font-size: 1.7rem; }
  .hero .hero-art { flex-basis: 180px; max-width: 180px; margin: 0 auto; }
  body { font-size: 1rem; }
}

/* ---------- week tabs (home) & transcript weeks ---------- */
.week-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin: 20px 0 4px; }
.week-tab {
  font-family: var(--font-head); font-weight: 700; text-decoration: none; color: var(--teal-dark);
  background: var(--card); border: 2px solid var(--line); border-radius: 999px; padding: 6px 16px;
}
.week-tab:hover { border-color: var(--teal); }
.week-tab.active { background: var(--teal); color: #fff; border-color: var(--teal); }
.week-tab.done:not(.active) { border-color: var(--green); color: var(--green); }
.week-tab.soon { opacity: 0.55; }
.week-tab small { font-weight: 600; font-size: 0.75rem; }
.tr-week { font-size: 1.2rem; margin: 34px 0 6px; color: var(--teal-dark); }
.transcript-summary { font-family: var(--font-head); font-weight: 700; color: var(--ink-soft); }

/* ---------- note cues, fading by week ----------
   Week 1: .cue gives the sentence.  Week 2: .cue-ask asks, with a check.
   Weeks 3–4: .cue-spot only marks the place.  Week 5+: no in-text cues. */
.cue.cue-ask { border-color: var(--violet); background: #f8f6fd; }
.cue.cue-ask .cue-label { color: var(--violet); }
.cue.cue-ask p { font-weight: 500; }
.cue.cue-ask details { margin-top: 6px; }
.cue.cue-ask summary {
  cursor: pointer; font-family: var(--font-head); font-weight: 700; color: var(--violet);
  list-style: none; display: inline-block; background: var(--violet-pale); border-radius: 999px;
  padding: 3px 12px; font-size: 0.88rem;
}
.cue.cue-ask summary::-webkit-details-marker { display: none; }
.cue.cue-ask details[open] summary { background: var(--green-pale); color: var(--green); }
.cue.cue-ask .cue-answer { margin-top: 8px; font-weight: 600; }
.cue.cue-spot { border-style: dotted; background: transparent; padding: 8px 14px; }
.cue.cue-spot p { font-weight: 500; color: var(--ink-soft); }

/* ---------- home lab (optional at-home experiment) ---------- */
.box-lab { background: #eaf7f4; border-left: 6px solid var(--teal); }
.box-lab .box-title { color: var(--teal-dark); }
.box-lab .lab-materials { font-size: 0.95rem; color: var(--ink-soft); margin-bottom: 8px; }
.box-lab ol { margin-bottom: 8px; }