/* =========================================================
   Great Auk Comparative Genomics — Lab Notebook
   Shared stylesheet
   ========================================================= */

:root {
  /* Arctic palette */
  --ice: #eef5fa;
  --ice-light: #f7fbfd;
  --ice-mid: #dfeaf2;
  --white: #ffffff;
  --navy: #0b2942;
  --navy-deep: #081d30;
  --navy-soft: #16344f;
  --border: #c9d9e3;
  --border-soft: #e2ecf2;
  --accent: #2f6690;
  --accent-dark: #1c4e6e;
  --accent-light: #eaf3f9;
  --text: #16293b;
  --text-muted: #51677d;
  --text-faint: #7c90a3;
  --success: #2f8f6b;
  --success-light: #e4f3ee;
  --warning: #a9682c;
  --warning-light: #f8ecdf;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(11, 41, 66, 0.07);
  --shadow-md: 0 6px 20px rgba(11, 41, 66, 0.08);
  --shadow-lg: 0 12px 32px rgba(11, 41, 66, 0.12);

  --font-heading: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, "Times New Roman", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --sidebar-width: 284px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--ice);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--navy);
  line-height: 1.25;
  margin: 0 0 0.5em;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--accent-dark);
}

a:hover {
  color: var(--navy);
}

code, pre {
  font-family: var(--font-mono);
}

ul, ol {
  padding-left: 1.3em;
}

/* =========================================================
   Layout shell
   ========================================================= */

.app-shell {
  display: flex;
  min-height: 100vh;
}

/* ---------- Sidebar ---------- */

.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: linear-gradient(180deg, var(--navy-deep) 0%, var(--navy) 100%);
  color: var(--ice-light);
  padding: 1.5rem 1.1rem 2rem;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  overflow-y: auto;
  z-index: 40;
  transition: transform 0.25s ease;
}

.sidebar-brand {
  margin-bottom: 1.75rem;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--white);
}

.brand-mark {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  border: 2px solid rgba(255, 255, 255, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-title,
.brand-subtitle {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: 0.01em;
  color: var(--white);
}

.brand-subtitle {
  color: rgba(238, 245, 250, 0.75);
}

.sidebar-section {
  margin-bottom: 1.4rem;
}

.sidebar-heading {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: rgba(238, 245, 250, 0.5);
  margin: 0 0 0.5rem 0.65rem;
  font-weight: 600;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.65rem;
  border-radius: var(--radius-sm);
  color: rgba(238, 245, 250, 0.82);
  text-decoration: none;
  font-size: 0.89rem;
  margin-bottom: 0.1rem;
  position: relative;
}

.nav-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  opacity: 0.8;
}

.nav-icon svg {
  width: 100%;
  height: 100%;
  display: block;
}

.sidebar-divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.12);
  margin: 0.4rem 0.65rem 1.1rem;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.07);
  color: var(--white);
}

.nav-link.is-active {
  background: rgba(255, 255, 255, 0.12);
  color: var(--white);
  font-weight: 600;
}

.nav-link.is-active::before {
  content: "";
  position: absolute;
  left: -0.1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--ice);
  border-radius: 2px;
}

.nav-number {
  font-size: 0.89rem;
  color: rgba(238, 245, 250, 0.55);
}

.nav-tag {
  margin-left: auto;
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: rgba(255, 255, 255, 0.1);
  color: rgba(238, 245, 250, 0.7);
  padding: 0.12rem 0.4rem;
  border-radius: 999px;
}

.nav-progress-pill {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: rgba(238, 245, 250, 0.6);
}

.sidebar-footer {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.72rem;
  color: rgba(238, 245, 250, 0.45);
}

/* ---------- Mobile nav toggle ---------- */

.nav-toggle {
  display: none;
  position: fixed;
  top: 0.9rem;
  left: 0.9rem;
  z-index: 50;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--white);
  box-shadow: var(--shadow-sm);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle::before,
.nav-toggle::after {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  background: var(--navy);
  position: relative;
}

.nav-toggle::before {
  margin-bottom: 4px;
}

.nav-toggle::after {
  margin-top: 4px;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(8, 29, 48, 0.4);
  z-index: 39;
}

/* ---------- Main content ---------- */

.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-width: 0;
  padding: 2.5rem 3rem 5rem;
}

.content-column {
  max-width: 880px;
  margin: 0 auto;
}

.content-column--wide {
  max-width: 1180px;
}

@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
  }

  body.nav-open .sidebar {
    transform: translateX(0);
  }

  body.nav-open .sidebar-overlay {
    display: block;
  }

  .nav-toggle {
    display: flex;
  }

  .main-content {
    margin-left: 0;
    padding: 4.5rem 1.25rem 4rem;
  }
}

/* =========================================================
   Hero (home page)
   ========================================================= */

.hero {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(100deg, var(--ice-light) 0%, var(--ice-light) 42%, var(--ice) 60%, var(--ice-mid) 100%);
  border: 1px solid var(--border-soft);
  padding: 3rem 3rem;
  margin-bottom: 1.75rem;
  box-shadow: var(--shadow-md);
  min-height: 300px;
  display: flex;
  align-items: center;
}

.hero-photo {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 56%;
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center bottom;
  display: block;
}

.hero-photo::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--ice-light) 0%, rgba(247, 251, 253, 0.55) 22%, rgba(247, 251, 253, 0) 48%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 460px;
}

.hero h1 {
  color: var(--navy);
  font-size: 2.15rem;
  line-height: 1.15;
  margin-bottom: 0.6rem;
}

.hero .hero-kicker {
  display: block;
  font-size: 0.82rem;
  letter-spacing: 0.3em;
  color: var(--accent-dark);
  font-family: var(--font-body);
  font-weight: 700;
  margin-top: 0.5rem;
}

.hero-accent-rule {
  width: 46px;
  height: 3px;
  background: var(--accent);
  border: none;
  margin: 0.8rem 0 1.1rem;
  border-radius: 2px;
}

.hero-subtitle {
  max-width: 420px;
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

.btn-pill {
  border-radius: 999px;
  padding: 0.7rem 1.4rem;
}

@media (max-width: 720px) {
  .hero {
    min-height: 0;
    padding: 2rem 1.5rem;
  }

  .hero-photo {
    position: static;
    width: 100%;
    height: 160px;
    order: -1;
    margin-bottom: 1.25rem;
    border-radius: var(--radius-md);
    overflow: hidden;
  }

  .hero-photo::before {
    display: none;
  }

  .hero-content {
    max-width: none;
  }

  .hero > div.hero-photo {
    display: block;
  }
}

/* =========================================================
   Dashboard stat row (overall progress / continue / quick links)
   ========================================================= */

.dashboard-row {
  display: grid;
  grid-template-columns: minmax(240px, 1.1fr) minmax(240px, 1.3fr) minmax(220px, 1fr);
  gap: 1.1rem;
  margin-bottom: 2.5rem;
  align-items: stretch;
}

@media (max-width: 900px) {
  .dashboard-row {
    grid-template-columns: 1fr;
  }
}

.stat-card {
  padding: 1.35rem 1.5rem;
}

.stat-card-title {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-weight: 700;
  margin-bottom: 1rem;
}

.donut-row {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.donut {
  position: relative;
  width: 84px;
  height: 84px;
  flex-shrink: 0;
}

.donut svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.donut-track {
  fill: none;
  stroke: var(--ice-mid);
  stroke-width: 10;
}

.donut-fill {
  fill: none;
  stroke: var(--accent);
  stroke-width: 10;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.4s ease;
}

.donut-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--navy);
  font-weight: 700;
}

.donut-stats {
  flex: 1;
  min-width: 0;
}

.donut-stats p {
  margin: 0 0 0.3rem;
  font-size: 0.86rem;
  color: var(--text-muted);
}

.donut-stats .progress-track {
  margin-top: 0.5rem;
}

/* ---------- Continue learning (compact card) ---------- */

.continue-card-compact {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
  color: inherit;
  padding: 1.35rem 1.5rem;
}

.continue-thumb {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-dark);
}

.continue-thumb svg {
  width: 24px;
  height: 24px;
}

.continue-body {
  flex: 1;
  min-width: 0;
}

.continue-body .continue-label {
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-dark);
  font-weight: 700;
  margin-bottom: 0.15rem;
}

.continue-body h3 {
  margin: 0 0 0.15rem;
  font-size: 0.98rem;
}

.continue-body p {
  margin: 0 0 0.6rem;
  color: var(--text-muted);
  font-size: 0.84rem;
}

/* ---------- Quick links card ---------- */

.quick-links-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
}

.quick-link-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  padding: 0.75rem 0.4rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-soft);
  background: var(--ice-light);
  text-decoration: none;
  color: var(--navy);
  font-size: 0.72rem;
  font-weight: 600;
  text-align: center;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.quick-link-tile:hover {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent-dark);
}

.quick-link-tile svg {
  width: 20px;
  height: 20px;
}

/* =========================================================
   Redesigned module cards (horizontal, with thumbnail)
   ========================================================= */

.module-card {
  flex-direction: row;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 1.2rem;
}

.module-thumb {
  width: 60px;
  height: 60px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  background: linear-gradient(145deg, var(--ice-mid) 0%, var(--ice) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-dark);
  border: 1px solid var(--border-soft);
}

.module-thumb svg {
  width: 28px;
  height: 28px;
}

.module-card-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.module-card-body .module-card-top {
  margin-bottom: 0;
}

.module-card-title-row {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

.module-card-title-row .module-number {
  font-size: 0.85rem;
}

.module-card-title-row h3 {
  font-size: 1rem;
  margin: 0;
}

.module-card-body p {
  font-size: 0.84rem;
  margin: 0;
}

.module-card-foot {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 0.15rem;
}

.module-card-foot .progress-track {
  flex: 1;
}

.module-card-foot .progress-label {
  white-space: nowrap;
  font-size: 0.74rem;
}

.module-chevron {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  border-radius: 999px;
  background: var(--accent-light);
  color: var(--accent-dark);
  display: flex;
  align-items: center;
  justify-content: center;
}

.module-chevron svg {
  width: 16px;
  height: 16px;
}

/* ---------- Footer info cards ---------- */

.info-card {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.3rem 1.5rem;
}

.info-icon {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  border-radius: 999px;
  background: var(--accent-light);
  color: var(--accent-dark);
  display: flex;
  align-items: center;
  justify-content: center;
}

.info-icon svg {
  width: 22px;
  height: 22px;
}

.info-card h3 {
  font-size: 1rem;
  margin: 0 0 0.3rem;
}

.info-card p {
  margin: 0;
  font-size: 0.87rem;
  color: var(--text-muted);
}

/* =========================================================
   Cards, grids, sections
   ========================================================= */

.section {
  margin-bottom: 2.75rem;
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1.1rem;
  gap: 1rem;
}

.section-heading h2 {
  font-size: 1.3rem;
  margin: 0;
}

.section-heading .section-sub {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.card {
  background: var(--white);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.1rem;
}

.module-card {
  display: flex;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.module-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border);
}

.module-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.module-number {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
  letter-spacing: 0.05em;
}

.status-badge {
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
}

.status-badge.active {
  background: var(--success-light);
  color: var(--success);
}

.status-badge.placeholder {
  background: var(--ice-mid);
  color: var(--text-muted);
}

.module-card h3 {
  font-size: 1.08rem;
  margin: 0;
}

.module-card p {
  color: var(--text-muted);
  font-size: 0.89rem;
  margin: 0;
  flex: 1;
}

.progress-track {
  width: 100%;
  height: 7px;
  background: var(--ice-mid);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, var(--success) 100%);
  border-radius: 999px;
  transition: width 0.3s ease;
}

.progress-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

.overall-progress-card {
  padding: 1.5rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.overall-progress-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.overall-progress-top .big-number {
  font-family: var(--font-heading);
  font-size: 1.9rem;
  color: var(--navy);
}

/* ---------- Continue learning ---------- */

.continue-card {
  padding: 1.4rem 1.6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  background: var(--accent-light);
  border-color: var(--border);
}

.continue-card .continue-label {
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-dark);
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.continue-card h3 {
  margin: 0 0 0.2rem;
  font-size: 1.15rem;
}

.continue-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ---------- Resource cards ---------- */

.resource-card {
  padding: 1.1rem 1.25rem;
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

.resource-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.resource-icon {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  border-radius: 9px;
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-dark);
}

.resource-icon svg {
  width: 20px;
  height: 20px;
}

.resource-card h3 {
  font-size: 1rem;
  margin: 0 0 0.2rem;
}

.resource-card p {
  margin: 0;
  font-size: 0.86rem;
  color: var(--text-muted);
}

/* =========================================================
   Buttons / form controls
   ========================================================= */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  font-family: var(--font-body);
}

.btn-primary {
  background: var(--navy);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--navy-soft);
  color: var(--white);
}

.btn-secondary {
  background: var(--white);
  border-color: var(--border);
  color: var(--navy);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
}

.btn-small {
  padding: 0.3rem 0.65rem;
  font-size: 0.76rem;
}

/* =========================================================
   Module page
   ========================================================= */

.breadcrumb {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1.2rem;
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--accent-dark);
}

.module-header {
  margin-bottom: 1.75rem;
}

.module-header .module-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-dark);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}

.module-header h1 {
  font-size: 1.95rem;
  margin-bottom: 0.6rem;
}

.module-intro {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 700px;
}

.objectives-card {
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}

.objectives-card h2 {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.7rem;
}

.objectives-card ul {
  margin: 0;
  padding-left: 1.2em;
}

.objectives-card li {
  margin-bottom: 0.35rem;
  font-size: 0.93rem;
}

.module-progress-bar {
  position: sticky;
  top: 0;
  background: var(--ice);
  padding: 0.9rem 0 1.1rem;
  z-index: 10;
  margin-bottom: 0.5rem;
}

.module-progress-bar .progress-label {
  margin-bottom: 0.35rem;
  font-weight: 600;
  color: var(--navy);
}

/* ---------- Exercises ---------- */

.exercise {
  background: var(--white);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 1.6rem 1.75rem 1.5rem;
  margin-bottom: 1.6rem;
  box-shadow: var(--shadow-sm);
  scroll-margin-top: 1rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.exercise.is-complete {
  border-color: var(--success);
  box-shadow: 0 0 0 1px var(--success) inset;
}

.exercise-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.1rem;
  flex-wrap: wrap;
}

.exercise-title {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.exercise-number {
  font-family: var(--font-mono);
  color: var(--text-faint);
  font-size: 0.95rem;
}

.exercise-title h3 {
  margin: 0;
  font-size: 1.15rem;
}

.exercise-complete-badge {
  display: none;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--success);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.exercise.is-complete .exercise-complete-badge {
  display: inline-flex;
}

.exercise-block {
  margin-bottom: 1rem;
}

.exercise-block:last-child {
  margin-bottom: 0;
}

.block-label {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-dark);
  background: var(--accent-light);
  padding: 0.15rem 0.5rem;
  border-radius: 5px;
  margin-bottom: 0.5rem;
}

.block-label.hint { color: var(--warning); background: var(--warning-light); }
.block-label.check { color: var(--success); background: var(--success-light); }
.block-label.solution { color: var(--accent-dark); background: var(--accent-light); }
.block-label.notes { color: var(--text-muted); background: var(--ice-mid); }
.block-label.doc { color: var(--accent-dark); background: var(--ice-mid); }

.further-reading {
  border-left: 2px solid var(--border);
  padding-left: 0.9rem;
}

.further-reading ul {
  margin: 0;
  padding-left: 1.1em;
}

.further-reading li {
  font-size: 0.87rem;
  margin-bottom: 0.3rem;
}

.further-reading a {
  color: var(--accent-dark);
}

.exercise-block p,
.exercise-block ul,
.exercise-block ol {
  font-size: 0.94rem;
  color: var(--text);
  margin: 0 0 0.5em;
}

.exercise-block p:last-child,
.exercise-block ul:last-child {
  margin-bottom: 0;
}

details.reveal {
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.9rem;
  background: var(--ice-light);
}

details.reveal summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--accent-dark);
  list-style: none;
}

details.reveal summary::-webkit-details-marker {
  display: none;
}

details.reveal summary::before {
  content: "▸ ";
}

details.reveal[open] summary::before {
  content: "▾ ";
}

details.reveal[open] {
  background: var(--ice-light);
}

details.reveal .reveal-body {
  margin-top: 0.7rem;
}

.command-block {
  position: relative;
  background: var(--navy-deep);
  color: #e7f1f7;
  border-radius: var(--radius-sm);
  padding: 0.85rem 3rem 0.85rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0.5rem 0;
}

.command-block .comment {
  color: #8fb3c9;
}

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #e7f1f7;
  font-size: 0.68rem;
  padding: 0.25rem 0.55rem;
  border-radius: 5px;
  cursor: pointer;
  font-family: var(--font-body);
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.copy-btn.copied {
  background: var(--success);
  border-color: var(--success);
  color: var(--white);
}

.notes-textarea {
  width: 100%;
  min-height: 80px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.75rem;
  font-family: var(--font-body);
  font-size: 0.89rem;
  color: var(--text);
  background: var(--ice-light);
}

.notes-textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  background: var(--white);
}

.notes-save-status {
  font-size: 0.74rem;
  color: var(--text-faint);
  margin-top: 0.3rem;
  min-height: 1em;
}

.completion-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding-top: 0.9rem;
  margin-top: 1rem;
  border-top: 1px solid var(--border-soft);
}

.completion-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--success);
  cursor: pointer;
}

.completion-row label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--navy);
  cursor: pointer;
}

.placeholder-note {
  font-size: 0.8rem;
  color: var(--text-faint);
  font-style: italic;
}

/* ---------- Callout (recurring emphasis, e.g. "flag ≠ failure") ---------- */

.callout-warning {
  background: var(--warning-light);
  border: 1px solid var(--warning);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.1rem;
  margin: 0.85rem 0;
  font-size: 0.92rem;
  color: var(--text);
}

.callout-warning strong {
  color: var(--warning);
}

/* ---------- Comparison tables (e.g. assembly quality comparisons) ---------- */

.comparison-table-wrap {
  overflow-x: auto;
  margin: 0.75rem 0;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.87rem;
}

.comparison-table th,
.comparison-table td {
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--border-soft);
  text-align: left;
  vertical-align: top;
}

.comparison-table thead th {
  background: var(--accent-light);
  color: var(--navy);
  font-weight: 700;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.comparison-table tbody th {
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
  background: var(--ice-light);
}

.comparison-table tbody tr:last-child td,
.comparison-table tbody tr:last-child th {
  border-bottom: none;
}

/* ---------- Phylogenetic diagrams (simplified, original SVGs) ---------- */

.phylo-diagram {
  background: var(--ice-light);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 1rem 1.1rem 0.8rem;
  margin: 0.85rem 0;
}

.phylo-diagram h4 {
  font-family: var(--font-body);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: 0 0 0.6rem;
}

.phylo-diagram svg {
  width: 100%;
  height: auto;
  display: block;
}

.phylo-diagram .branch {
  fill: none;
  stroke: var(--border);
  stroke-width: 1.6;
}

.phylo-diagram .branch-highlight {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.2;
}

.phylo-diagram .branch-extinct {
  fill: none;
  stroke: var(--text-faint);
  stroke-width: 1.6;
  stroke-dasharray: 3 3;
}

.phylo-diagram text {
  font-family: var(--font-body);
  font-size: 12.5px;
  fill: var(--text);
}

.phylo-diagram .label-highlight {
  font-weight: 700;
  fill: var(--accent-dark);
}

.phylo-diagram .label-extinct {
  font-style: italic;
  fill: var(--text-faint);
}

.phylo-diagram .dot-living {
  fill: var(--accent);
}

.phylo-caption {
  font-size: 0.78rem;
  color: var(--text-faint);
  margin: 0.5rem 0 0;
}

.phylo-caption a {
  color: var(--text-faint);
  text-decoration: underline;
}

/* ---------- FASTQ anatomy (annotated 4-line record) ---------- */

.fastq-anatomy {
  background: var(--navy-deep);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1rem;
  margin: 0.75rem 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  overflow-x: auto;
}

.fastq-line {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.2rem 0;
  white-space: nowrap;
}

.fastq-line + .fastq-line {
  border-top: 1px dashed rgba(255, 255, 255, 0.12);
}

.fastq-line-label {
  color: #8fb3c9;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.fastq-line-content {
  color: #e7f1f7;
}

.fastq-line-content .qual-high { color: #8fe3b8; }
.fastq-line-content .qual-low { color: #e39a8f; }

/* ---------- Concept chain (short causal-chain diagrams) ---------- */

.concept-chain {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  margin: 0.75rem 0;
  max-width: 560px;
}

.concept-chain-step {
  background: var(--ice-light);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 0.65rem 1rem;
  font-size: 0.88rem;
  color: var(--text);
}

.concept-chain-arrow {
  align-self: center;
  color: var(--accent);
  font-size: 1rem;
  line-height: 1.4;
  padding: 0.1rem 0;
}

/* ---------- Module summary / navigation footer ---------- */

.module-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-soft);
  flex-wrap: wrap;
  gap: 1rem;
}

.summary-card {
  padding: 1.5rem 1.75rem;
  margin-top: 2rem;
  background: var(--accent-light);
  border-color: var(--border);
}

.summary-card h2 {
  font-size: 1.05rem;
  margin-bottom: 0.6rem;
}

/* =========================================================
   Placeholder modules
   ========================================================= */

.placeholder-module {
  padding: 2.5rem 2rem;
  text-align: left;
}

.placeholder-module .status-badge {
  margin-bottom: 1rem;
}

.placeholder-list {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.placeholder-list-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 0.9rem;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-faint);
  font-size: 0.88rem;
  background: var(--ice-light);
}

.placeholder-list-item .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--border);
  flex-shrink: 0;
}

/* =========================================================
   Toolbox / Resources / Glossary pages
   ========================================================= */

.toolbox-group {
  margin-bottom: 1.75rem;
}

.toolbox-group h2 {
  font-size: 1.05rem;
  margin-bottom: 0.3rem;
}

.toolbox-group .group-sub {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 1rem;
}

.command-card {
  padding: 1rem 1.25rem;
  margin-bottom: 0.85rem;
}

.command-card-head {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  margin-bottom: 0.4rem;
  flex-wrap: wrap;
}

.command-card-head code {
  background: var(--navy-deep);
  color: #e7f1f7;
  padding: 0.18rem 0.55rem;
  border-radius: 5px;
  font-size: 0.88rem;
}

.command-card p {
  margin: 0;
  font-size: 0.89rem;
  color: var(--text-muted);
}

.command-card .example {
  margin-top: 0.5rem;
}

.glossary-term {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  margin-bottom: 0.6rem;
  background: var(--white);
}

.glossary-term summary {
  padding: 0.85rem 1.1rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--navy);
  list-style: none;
}

.glossary-term summary::-webkit-details-marker {
  display: none;
}

.glossary-term summary::after {
  content: "+";
  float: right;
  color: var(--accent);
  font-weight: 700;
}

.glossary-term[open] summary::after {
  content: "–";
}

.glossary-term-body {
  padding: 0 1.1rem 1rem;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.page-intro {
  max-width: 700px;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.page-title {
  font-size: 1.8rem;
  margin-bottom: 0.4rem;
}

footer.site-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-soft);
  font-size: 0.78rem;
  color: var(--text-faint);
}

@media (max-width: 600px) {
  .hero {
    padding: 2.5rem 1.5rem;
  }

  .hero h1 {
    font-size: 1.7rem;
  }

  .hero-illustration {
    opacity: 0.35;
    width: 70%;
  }

  .exercise {
    padding: 1.25rem 1.1rem 1.2rem;
  }

  .main-content {
    padding-top: 4.25rem;
  }
}

/* =========================================================
   Supervisor view (standalone page, no sidebar)
   ========================================================= */

.supervisor-shell {
  max-width: 900px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
}

.supervisor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.supervisor-header h1 {
  font-size: 1.4rem;
  margin: 0;
}

.supervisor-login-card {
  max-width: 360px;
  margin: 3rem auto;
  padding: 2rem 1.75rem;
}

.form-field {
  margin-bottom: 1rem;
}

.form-field label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.form-field input {
  width: 100%;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.92rem;
  color: var(--text);
  background: var(--ice-light);
}

.form-field input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  background: var(--white);
}

.form-error {
  color: var(--warning);
  font-size: 0.85rem;
  margin: -0.4rem 0 1rem;
  min-height: 1.1em;
}

.access-denied-card {
  max-width: 480px;
  margin: 3rem auto;
  padding: 2rem 1.75rem;
  text-align: center;
}

.supervisor-filters {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.supervisor-filters select {
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--text);
  background: var(--white);
}

.identity-picker {
  margin-bottom: 1rem;
}

.identity-picker select {
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--warning);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--text);
  background: var(--white);
}

.identity-list {
  margin: 0.5rem 0 0;
  padding-left: 1.1em;
  font-size: 0.85rem;
}

.module-progress-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin: 2rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--border);
}

.module-progress-heading h2 {
  font-size: 1.1rem;
  margin: 0;
}

.module-progress-heading .progress-count {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  white-space: nowrap;
}

.supervisor-response-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  margin: 0.9rem 0 0.3rem;
}

.readonly-notes {
  width: 100%;
  min-height: 60px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.75rem;
  font-family: var(--font-body);
  font-size: 0.89rem;
  color: var(--text);
  background: var(--ice-light);
  white-space: pre-wrap;
}

.readonly-notes.is-empty {
  color: var(--text-faint);
  font-style: italic;
}

.supervisor-meta {
  font-size: 0.78rem;
  color: var(--text-faint);
  margin-top: 0.5rem;
}

.supervisor-empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 2rem 1rem;
}

/* ---------- Merged Luigi view: multiple saved versions ---------- */

.version-badge {
  display: inline-block;
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--warning);
  background: var(--warning-light);
  padding: 0.12rem 0.5rem;
  border-radius: 999px;
  margin-left: 0.5rem;
  vertical-align: middle;
}

.version-history {
  margin-top: 0.8rem;
}

.version-entry {
  border-left: 2px solid var(--border);
  padding-left: 0.9rem;
  margin: 0.7rem 0;
}

.version-entry:first-child {
  margin-top: 0.7rem;
}

.version-badge {
  display: inline-block;
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--warning);
  background: var(--warning-light);
  padding: 0.12rem 0.5rem;
  border-radius: 999px;
  margin-left: 0.4rem;
  vertical-align: middle;
}

.version-history {
  margin-top: 0.8rem;
}

.version-entry {
  border-left: 2px solid var(--border);
  padding-left: 0.9rem;
  margin: 0.7rem 0;
}

.version-entry:first-child {
  margin-top: 0.7rem;
}