:root {
  --primary: #2e7d6b;
  --primary-dark: #1f5c4f;
  --accent: #e8895a;
  --bg: #f6f3ec;
  --card: #ffffff;
  --text: #2b2b2b;
  --muted: #6b6b6b;
  --border: #e2dccf;
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100%;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

header.top-bar {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

header.top-bar h1 {
  font-size: 18px;
  margin: 0;
  font-weight: 600;
}

header.top-bar .subtitle {
  font-size: 12px;
  opacity: 0.85;
  margin-top: 2px;
}

.progress-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 180px;
}

.progress-bar-track {
  width: 140px;
  height: 8px;
  background: rgba(255,255,255,0.3);
  border-radius: 6px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width 0.3s ease;
}

.progress-label {
  font-size: 12px;
  white-space: nowrap;
}

.layout {
  flex: 1;
  display: flex;
  min-height: 0;
}

nav.sidebar {
  width: 280px;
  background: #fffdf9;
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 10px 0;
  flex-shrink: 0;
}

.module-block {
  margin-bottom: 4px;
}

.module-title {
  padding: 10px 16px 4px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.slide-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px 8px 20px;
  font-size: 13.5px;
  color: var(--text);
  cursor: pointer;
  border-left: 3px solid transparent;
}

.slide-link:hover {
  background: #f1ece1;
}

.slide-link.active {
  background: #eaf3ef;
  border-left-color: var(--primary);
  font-weight: 600;
  color: var(--primary-dark);
}

.slide-check {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1.5px solid #c9c1ad;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: transparent;
}

.slide-link.visited .slide-check {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

main.content {
  flex: 1;
  overflow-y: auto;
  padding: 30px 40px 60px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.slide-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
  padding: 32px 40px;
  max-width: 760px;
  width: 100%;
}

.slide-card h2.slide-title {
  margin-top: 0;
  color: var(--primary-dark);
  border-bottom: 2px solid var(--border);
  padding-bottom: 12px;
  font-size: 22px;
}

.slide-card h4 {
  color: var(--primary-dark);
  margin-top: 22px;
  margin-bottom: 6px;
}

.slide-card p { line-height: 1.65; }
.slide-card .muted { color: var(--muted); font-size: 13.5px; }
.slide-card .lead { font-size: 16px; color: var(--muted); }

.styled-list {
  line-height: 1.7;
  padding-left: 22px;
}
.styled-list.numbered { padding-left: 24px; }
.styled-list li { margin-bottom: 6px; }

.cover-slide {
  text-align: center;
}
.cover-img {
  max-width: 220px;
  border-radius: 10px;
  box-shadow: 0 4px 14px rgba(0,0,0,0.18);
  margin-bottom: 18px;
}
.cover-text h2 { border: none; }

.table-wrap {
  overflow-x: auto;
  margin: 14px 0;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}
table th, table td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}
table th {
  background: #eaf3ef;
  color: var(--primary-dark);
}

.finish-note {
  margin-top: 20px;
  padding: 12px 16px;
  background: #eaf3ef;
  border-left: 4px solid var(--primary);
  border-radius: 8px;
  font-weight: 600;
  color: var(--primary-dark);
}

.nav-footer {
  margin-top: 32px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

button.nav-btn {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.2s;
}
button.nav-btn:hover { background: var(--primary-dark); }
button.nav-btn:disabled {
  background: #cfcabc;
  cursor: not-allowed;
}
button.nav-btn.secondary {
  background: #fff;
  color: var(--primary-dark);
  border: 1px solid var(--border);
}
button.nav-btn.secondary:hover { background: #f1ece1; }

/* Quiz */
.quiz-question {
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}
.quiz-question:last-of-type { border-bottom: none; }
.quiz-question p.q-text { font-weight: 600; margin-bottom: 10px; }
.quiz-option {
  display: block;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 8px;
  cursor: pointer;
  font-size: 14px;
}
.quiz-option:hover { background: #f7f4ec; }
.quiz-option input { margin-right: 8px; }
.quiz-option.correct { background: #e3f4ea; border-color: #4caf81; }
.quiz-option.incorrect { background: #fbe6e3; border-color: #e07a63; }

.quiz-submit-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 10px;
}
.quiz-result {
  font-weight: 600;
}

@media (max-width: 760px) {
  .layout { flex-direction: column; }
  nav.sidebar { width: 100%; max-height: 220px; }
  main.content { padding: 18px; }
  .slide-card { padding: 22px 18px; }
}