/* ==========================================================================
   NICU Tutor — shared styles
   Warm, kid-friendly, high-contrast. No external fonts; works offline.
   ========================================================================== */

:root {
  --bg: #fff8f0;
  --bg-deep: #fdefdd;
  --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;
  --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;
}

* { 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;
}

/* ---------- layout ---------- */

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

.wrap-wide { max-width: 980px; }

/* ---------- 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 {
  color: #fff;
  text-decoration: none;
  font-family: var(--font-head);
  font-weight: 700;
}

.topbar .brand {
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.topbar nav { display: flex; gap: 18px; font-size: 0.95rem; }
.topbar nav a:hover { text-decoration: underline; }

/* ---------- headings & text ---------- */

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;
}
h2 .h-emoji { font-size: 1.4rem; }
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); }

strong { color: var(--ink); }

.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(--coral);
  margin-top: 30px;
}

/* ---------- 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 { 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); }

/* ---------- figures / diagrams ---------- */

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;
  text-align: center;
}

/* ---------- tables ---------- */

.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; }

/* ---------- word chips (glossary-in-lesson) ---------- */

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

/* ---------- home page lesson grid ---------- */

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 18px;
  margin: 26px 0;
}

.lesson-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: 3px solid transparent;
  transition: transform 0.15s ease, border-color 0.15s ease;
  position: relative;
}
.lesson-card:hover { transform: translateY(-3px); border-color: var(--teal); }
.lesson-card .lc-num {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--coral);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.lesson-card .lc-icon { font-size: 2.2rem; line-height: 1; }
.lesson-card h3 { margin: 2px 0; color: var(--teal-dark); }
.lesson-card .lc-sub { color: var(--ink-soft); font-size: 0.95rem; flex: 1; }
.lesson-card .lc-status {
  font-family: var(--font-head);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--ink-soft);
}
.lesson-card.done .lc-status { color: var(--green); }
.lesson-card .lc-badge {
  position: absolute;
  top: 14px;
  right: 16px;
  font-size: 1.6rem;
  filter: grayscale(1) opacity(0.25);
}
.lesson-card.done .lc-badge { filter: none; }

.capstone-card { border: 3px dashed var(--sunny); }
.capstone-card:hover { border-color: var(--sunny); }

/* ---------- badge shelf ---------- */

.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); }

/* ---------- 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-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; }

/* ---------- lesson footer nav ---------- */

.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); }

/* ---------- misc ---------- */

.center { text-align: center; }

.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(--teal-pale);
  color: var(--teal-dark);
  border-radius: 999px;
  padding: 3px 12px;
  margin-right: 6px;
}

@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; }
}