/* ============================================
   BASE PORTAL STYLES
   ============================================ */

:root {
  --bg: #0f172a;
  --panel: #111827;
  --panel-2: #1f2937;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --line: #1f2937;
  --accent: #3b82f6;
  --accent-2: #60a5fa;
  --danger: #ef4444;
  --warning: #f59e0b;
  --success: #22c55e;
}

/* Light theme */
body.light {
  --bg: #f8fafc;
  --panel: #ffffff;
  --panel-2: #f1f5f9;
  --text: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --accent: #2563eb;
  --accent-2: #3b82f6;
  --danger: #dc2626;
  --warning: #d97706;
  --success: #16a34a;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.5em;
  line-height: 1.3;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-2);
}

/* Navigation */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--text);
}

.brand-mark {
  width: 32px;
  height: 32px;
  background: var(--accent);
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.85rem;
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  text-decoration: none;
}

.button.primary {
  background: var(--accent);
  color: white;
}

.button.primary:hover {
  background: var(--accent-2);
}

.button.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}

.button.ghost:hover {
  border-color: var(--accent);
}

/* Cards */
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
}

.hero-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
}

/* Eyebrow label */
.eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 0 0 8px;
}

/* Formula display */
.formula-display {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 1.5rem;
  font-weight: 600;
  text-align: center;
  padding: 20px;
  background: rgba(59, 130, 246, 0.1);
  border-radius: 12px;
  margin: 16px 0;
}

/* Input range styling */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--bg);
  border-radius: 3px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

/* Filter buttons */
.filter {
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.9rem;
}

.filter:hover {
  border-color: var(--accent);
}

.filter.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

/* Symbol DL */
.symbol-dl {
  display: grid;
  gap: 8px;
  margin: 0;
}

.symbol-dl > div {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.symbol-dl dt {
  font-family: ui-monospace, monospace;
  font-weight: 700;
  min-width: 24px;
  color: var(--accent);
}

.symbol-dl dd {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

/* Example cards */
.example-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
}

.example-card span {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.example-card h3 {
  font-size: 1.1rem;
  margin: 8px 0 6px;
}

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


.hero {
  padding: clamp(40px, 6vw, 80px) clamp(16px, 4vw, 40px);
  max-width: 1100px;
  margin: 0 auto;
}

.hero h1 {
  font-size: clamp(2rem, 3vw + 1rem, 3rem);
  max-width: 20ch;
}

.hero > p {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 56ch;
  margin-bottom: 24px;
}

.modules-grid {
  display: grid;
  gap: 20px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 40px) 60px;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.module-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  transition: transform 0.2s, border-color 0.2s;
}

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

.module-card .module-number {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.module-card h3 {
  font-size: 1.2rem;
  margin: 8px 0 10px;
}

.module-card p {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0 0 16px;
}

.module-card .meta {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--muted);
}

.hero {
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  max-width: 1100px;
  margin: 0 auto;
  padding: clamp(40px, 6vw, 80px) clamp(16px, 4vw, 40px);
}

@media (min-width: 860px) {
  .hero-grid {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
  }
}

.hero-grid h1 {
  font-size: clamp(2rem, 3vw + 1rem, 3rem);
  max-width: 20ch;
  margin: 10px 0 16px;
}

.hero-grid .hero-text {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 56ch;
  margin-bottom: 24px;
}

.nav-links,
.module-nav-utils {
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav-links::-webkit-scrollbar,
.module-nav-utils::-webkit-scrollbar {
  display: none;
}

.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--panel);
  flex-shrink: 0;
}

.lang-toggle button {
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 6px 10px;
  cursor: pointer;
  letter-spacing: 0.04em;
  min-width: 36px;
  white-space: nowrap;
}

.lang-toggle button:hover {
  color: var(--text);
}

.lang-toggle button.active {
  background: var(--accent);
  color: #fff;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
  transition: color 0.2s;
  white-space: nowrap;
}

.nav-links a:hover {
  color: var(--text);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 1.2rem;
  line-height: 1;
  transition: border-color 0.2s, background 0.2s;
  color: var(--text);
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--accent);
  background: var(--panel);
}

.hero .hero-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
}

.hero-card .status {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: rgba(59,130,246,0.12);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 10px;
}

.hero-card h2 {
  font-size: 1.15rem;
  margin: 0 0 10px;
}

.hero-card p {
  font-size: 0.92rem;
  color: var(--muted);
  margin: 0 0 18px;
}

.metric-row {
  display: flex;
  gap: 24px;
}

.metric-row div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.metric-row strong {
  font-size: 1.5rem;
  color: var(--text);
}

.metric-row span {
  font-size: 0.78rem;
  color: var(--muted);
}

body:not(.module-learn) .section {
  max-width: 1100px;
  margin: 0 auto;
  padding: clamp(40px, 6vw, 72px) clamp(16px, 4vw, 40px);
  border-bottom: 1px solid var(--line);
}

body:not(.module-learn) .section-heading {
  margin-bottom: 32px;
}

body:not(.module-learn) .section-heading h2 {
  font-size: clamp(1.4rem, 1.2vw + 1rem, 1.9rem);
  margin: 6px 0 10px;
}

body:not(.module-learn) .section-heading > p {
  color: var(--muted);
  font-size: 1.02rem;
  max-width: 60ch;
}

.intro h2 {
  font-size: clamp(1.5rem, 1.4vw + 1rem, 2rem);
  max-width: 30ch;
  margin: 8px 0 14px;
}

.intro p {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 64ch;
  line-height: 1.7;
}

.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.pillars article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 24px;
}

.pillars article span {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.pillars article h3 {
  font-size: 1.1rem;
  margin: 0 0 8px;
}

.pillars article p {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.6;
}

.standard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.standard-grid article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
}

.standard-grid article span {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 10px;
}

.standard-grid article p {
  font-size: 0.88rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.55;
}

.split .path-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.path-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 22px;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.path-card:hover {
  border-color: var(--accent);
}

.path-card.active {
  border-color: var(--accent);
  background: rgba(59,130,246,0.08);
}

.path-card strong {
  font-size: 1rem;
}

.path-card span {
  font-size: 0.85rem;
  color: var(--muted);
}

.module-section .section-heading {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 28px;
}

.module-section .section-heading > div:first-child {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 16px;
}

.module-section .section-heading > div:first-child > div:first-child {
  flex: 1;
  min-width: 200px;
}

.filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.filter-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-right: 4px;
}

.filter-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.module-catalog-filters {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.module-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.module-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

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

.module-card--rec {
  border-color: rgba(59, 130, 246, 0.45);
  background: linear-gradient(160deg, var(--panel) 60%, rgba(59,130,246,0.06) 100%);
}

.module-card--rec::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--accent);
  border-radius: 16px 0 0 16px;
}

.module-card--rec:hover {
  box-shadow: 0 0 0 1px rgba(59,130,246,0.35), 0 4px 20px rgba(59,130,246,0.12);
}

.module-card--visited {
  border-color: rgba(34, 197, 94, 0.25);
}

.module-card--visited .module-visited-dot {
  display: inline-flex;
}

.module-visited-dot {
  display: none;
  align-items: center;
  gap: 4px;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--success);
  background: rgba(34,197,94,0.12);
  border-radius: 999px;
  padding: 2px 8px;
}

.badge-rec {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--accent);
  background: rgba(59,130,246,0.14);
  border-radius: 999px;
  padding: 2px 8px;
  letter-spacing: 0.02em;
}

.module-top-badges {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.module-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.module-top .module-number {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.badge {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 10px;
  border-radius: 999px;
}

.badge.foundation {
  background: rgba(59,130,246,0.12);
  color: #60a5fa;
}

.badge.applied {
  background: rgba(245,158,11,0.12);
  color: #fbbf24;
}

.badge.integration {
  background: rgba(139,92,246,0.12);
  color: #a78bfa;
}

.domain-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 4px 0 10px;
}

.domain-tag {
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
}

.domain-tag.domain-hw { border-color: rgba(245,158,11,0.35); color: #fbbf24; }
.domain-tag.domain-fw { border-color: rgba(34,197,94,0.35); color: #4ade80; }
.domain-tag.domain-fpga { border-color: rgba(168,85,247,0.35); color: #c084fc; }
.domain-tag.domain-sw { border-color: rgba(59,130,246,0.35); color: #60a5fa; }
.domain-tag.domain-ee { border-color: rgba(236,72,153,0.35); color: #f472b6; }
.domain-tag.domain-phy { border-color: rgba(14,165,233,0.35); color: #38bdf8; }
.domain-tag.domain-sys { border-color: rgba(139,92,246,0.35); color: #a78bfa; }

.module-card h3 {
  font-size: 1.2rem;
  margin: 0 0 8px;
}

.module-card p {
  font-size: 0.92rem;
  color: var(--muted);
  margin: 0 0 14px;
}

.module-card ul {
  list-style: none;
  padding: 0;
  margin: 0 0 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.module-card ul li {
  font-size: 0.82rem;
  color: var(--muted);
  padding-left: 16px;
  position: relative;
}

.module-card ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 7px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--line);
}

.module-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  padding: 8px 16px;
  border: 1px solid rgba(59,130,246,0.35);
  border-radius: 8px;
  background: rgba(59,130,246,0.07);
  margin-top: auto;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
  align-self: flex-start;
}

.module-link:hover {
  background: rgba(59,130,246,0.16);
  border-color: var(--accent);
  color: var(--accent-2);
}

.module-link.disabled {
  color: var(--muted);
  border-color: var(--line);
  background: transparent;
  opacity: 0.5;
  pointer-events: none;
}

.module-lab-desc {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 14px;
  flex: 1;
  line-height: 1.5;
}

.module-footer-nav {
  border-top: 1px solid var(--line);
  padding: 28px clamp(16px, 4vw, 40px);
  max-width: 900px;
  margin: 0 auto;
}

.modnav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.modnav-btn {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  text-decoration: none;
  transition: border-color 0.2s, background 0.2s;
  min-width: 160px;
}

.modnav-btn:hover {
  border-color: var(--accent);
  background: rgba(59,130,246,0.06);
}

.modnav-btn.modnav-next {
  align-items: flex-end;
}

.modnav-btn.modnav-disabled {
  opacity: 0.35;
  pointer-events: none;
}

.modnav-dir {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.modnav-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
}

.modnav-home-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.82rem;
  padding: 8px;
  border-radius: 8px;
  transition: color 0.2s;
}

.modnav-home-link span:first-child {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.modnav-home-link:hover {
  color: var(--accent);
}

.modnav-home-link:hover span:first-child {
  color: var(--accent);
}

.roadmap ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 20px;
  counter-reset: step;
}

.roadmap li {
  counter-increment: step;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.roadmap li::before {
  content: counter(step);
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  background: rgba(59,130,246,0.12);
  color: var(--accent);
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 700;
}

.roadmap li strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 4px;
}

.roadmap li strong + * {
  color: var(--muted);
  font-size: 0.9rem;
}

.corporate-track {
  background: linear-gradient(180deg, rgba(59,130,246,0.04) 0%, transparent 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.corporate-intro {
  max-width: 720px;
  margin-bottom: 28px;
}

.corporate-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.corporate-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
}

.corporate-card h3 {
  font-size: 1rem;
  margin-bottom: 14px;
}

.pilot-list {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 10px;
}

.pilot-list a {
  color: var(--accent-2);
  text-decoration: none;
}

.pilot-list a:hover {
  text-decoration: underline;
}

.corp-format {
  display: flex;
  gap: 20px;
  margin-top: 18px;
  flex-wrap: wrap;
}

.corp-format div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.corp-format strong {
  font-size: 1.1rem;
  color: var(--accent);
}

.corp-format span {
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.corp-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.hero--compact {
  padding-bottom: 0;
}

.hero--compact .hero-copy h1 {
  font-size: 2rem;
}

.lab-domain-note {
  font-size: 0.82rem;
  color: var(--accent-2);
  line-height: 1.5;
  margin: 10px 0 0;
  padding: 10px 12px;
  background: rgba(59,130,246,0.08);
  border-radius: 8px;
  border-left: 3px solid var(--accent);
}

.q1-presets--domain {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}

/* LMS track page */
.lms-page {
  max-width: 960px;
  margin: 0 auto;
}

.lms-progress-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 24px;
  padding: 16px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.lms-progress-bar strong {
  font-size: 1.25rem;
  color: var(--accent);
}

.lms-reset-btn {
  margin-left: auto;
  font-size: 0.8rem;
}

.lms-modules {
  display: grid;
  gap: 20px;
}

.lms-module-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
}

.lms-module-card--done {
  border-color: rgba(34,197,94,0.4);
}

.lms-module-card header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.lms-badge {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(34,197,94,0.15);
  color: #4ade80;
}

.lms-goal {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 14px;
}

.lms-deep-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-bottom: 16px;
  font-size: 0.85rem;
}

.lms-deep-links a {
  color: var(--accent-2);
}

.lms-checks {
  display: grid;
  gap: 8px;
}

.lms-check {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  cursor: pointer;
}

.lms-check input {
  margin-top: 3px;
}

/* Case template */
.case-form-wrap {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  gap: 28px;
}

@media (min-width: 800px) {
  .case-form-wrap {
    grid-template-columns: 1fr 260px;
  }
}

.case-form {
  display: grid;
  gap: 18px;
}

.case-form label,
.case-form fieldset {
  display: grid;
  gap: 6px;
}

.case-form span,
.case-form legend {
  font-size: 0.85rem;
  font-weight: 600;
}

.case-form input,
.case-form select,
.case-form textarea {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text);
  font: inherit;
}

.case-stack {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  display: grid;
  gap: 8px;
}

.case-stack label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 400;
  font-size: 0.88rem;
}

.case-tips {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
  font-size: 0.88rem;
}

.case-tips ul {
  margin: 10px 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

@media print {
  .no-print { display: none !important; }
  .case-form input,
  .case-form textarea {
    border: 1px solid #ccc;
  }
}

/* Systems integration Stack Lab */
.si-lab {
  display: grid;
  gap: 24px;
}

@media (min-width: 900px) {
  .si-lab {
    grid-template-columns: 300px 1fr;
  }
}

.si-lab-side {
  display: grid;
  gap: 14px;
  align-content: start;
}

.si-fault-presets {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.si-fault-presets button {
  text-align: left;
}

.si-lab-meta h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin: 12px 0 8px;
}

.si-list,
.si-timeline {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.si-timeline li {
  margin-bottom: 6px;
}

.si-timeline li span {
  color: var(--accent);
  font-weight: 700;
  margin-right: 6px;
}

.si-mod-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.si-mod-link {
  font-size: 0.82rem;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--accent);
  color: var(--accent-2);
  text-decoration: none;
}

.si-mod-links--row {
  gap: 10px;
}

.si-foundation-strip {
  margin-top: 28px;
  padding: 18px 20px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
}

.si-mod-link--pill {
  padding: 6px 14px;
  font-size: 0.85rem;
}

.sec-node-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sec-node-list button.active {
  border-color: var(--accent);
  background: rgba(96, 165, 250, 0.15);
}

.sec-stride-bars {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}

.sec-stride-row {
  display: grid;
  grid-template-columns: 24px 1fr minmax(80px, 120px) 36px;
  gap: 8px;
  align-items: center;
  font-size: 0.78rem;
}

.sec-stride-tag {
  font-weight: 700;
  color: var(--accent-2);
}

.sec-stride-name {
  color: var(--muted);
}

.sec-stride-track {
  height: 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.sec-stride-fill {
  height: 100%;
  background: linear-gradient(90deg, #f59e0b, #ef4444);
  border-radius: 4px;
}

.hf-factor-grid {
  display: grid;
  gap: 12px;
}

.hf-factor-card .hf-cat-btns {
  margin-top: 10px;
}

.hf-factor-fb {
  margin: 8px 0 0;
  font-size: 0.82rem;
  min-height: 1.2em;
}

.si-muted {
  color: var(--muted);
  list-style: none;
  margin-left: -1.1rem;
}

.si-stack {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.si-layer {
  text-align: left;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 18px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  width: 100%;
  color: inherit;
  font: inherit;
}

.si-layer:hover {
  border-color: var(--accent);
}

.si-layer--lit {
  border-color: rgba(59,130,246,0.35);
}

.si-layer--source {
  border-color: #ef4444;
  background: rgba(239,68,68,0.08);
}

.si-layer--affected {
  border-color: rgba(245,158,11,0.45);
  background: rgba(245,158,11,0.06);
}

.si-layer-name {
  display: block;
  font-weight: 700;
  font-size: 0.95rem;
}

.si-layer-desc {
  display: block;
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 4px;
}

.si-fault-label {
  display: block;
  font-size: 0.78rem;
  color: #f87171;
  margin-top: 6px;
  font-style: normal;
}

.transfer-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.transfer-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
}

.transfer-card h3 {
  font-size: 0.95rem;
  margin: 8px 0 6px;
}

.transfer-card p {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.5;
}

.transfer-tag {
  display: inline-block;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(59,130,246,0.12);
  color: var(--accent);
}

.hero {
  padding: 64px 24px;
  max-width: 1100px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.5rem;
max-width: 20ch;
}

.hero > p {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 56ch;
  margin-bottom: 24px;
}

.modules-grid {
  display: grid;
  gap: 20px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 40px) 60px;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.module-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  transition: transform 0.2s, border-color 0.2s;
}

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

.module-card .module-number {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.module-card h3 {
  font-size: 1.2rem;
  margin: 8px 0 10px;
}

.module-card p {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0 0 16px;
}

.module-card .meta {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ============================================
   MODULE 1 REDESIGN - CLEAN 6-SECTION STRUCTURE
   ============================================ */

/* --- Header & Navigation --- */
body.module-learn {
  --max-content: 980px;
}

.module-hero {
  position: relative;
  padding: 0 0 clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}

.module-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  padding: 14px clamp(16px, 4vw, 40px);
  background: var(--panel);
  border-radius: 999px;
  margin: 16px clamp(16px, 4vw, 40px) 0;
  justify-content: center;
}

.module-toc a {
  font-size: 0.85rem;
  color: var(--text);
  text-decoration: none;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.module-toc a:hover {
  opacity: 1;
  color: var(--accent);
}

.module-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  max-width: var(--max-content);
  margin: 0 auto;
  padding: clamp(24px, 3vw, 40px) clamp(16px, 4vw, 40px);
}

@media (min-width: 720px) {
  .module-hero-grid {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
  }
}

.module-hero-grid h1 {
  font-size: clamp(1.8rem, 2.2vw + 1rem, 2.6rem);
  margin: 8px 0 12px;
}

.hero-text {
  font-size: 1.05rem;
  line-height: 1.6;
  max-width: 56ch;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.hero-card--compact {
  padding: 18px 20px;
}

.hero-card--compact .hero-card-title {
  font-size: 0.9rem;
  margin: 0 0 12px;
}

.module-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  margin-bottom: 14px;
}

.module-facts span {
  font-size: 0.8rem;
  padding: 4px 10px;
  background: rgba(255,255,255,0.05);
  border-radius: 999px;
}

/* --- Sections --- */
.section {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 72px) clamp(16px, 4vw, 40px);
  border-bottom: 1px solid var(--line);
}

.section-heading {
  margin-bottom: 32px;
}

.section-heading h2 {
  font-size: clamp(1.4rem, 1.2vw + 1rem, 1.9rem);
  margin: 6px 0 10px;
}

.section-heading > p {
  color: var(--muted);
  font-size: 1.02rem;
  max-width: 60ch;
}

/* --- Core Section (Little's Law) --- */
.core-section .intro {
  display: grid;
  gap: 28px;
  margin-bottom: 32px;
}

@media (min-width: 720px) {
  .core-section .intro {
    grid-template-columns: 1fr 1fr;
  }
}

.formula-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
}

.formula {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0 0 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.little-law-lab {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px 24px;
}

.little-law-calculator {
  display: grid;
  gap: 12px;
  margin: 12px 0 16px;
}

.little-law-calculator label {
  display: grid;
  gap: 6px;
  font-size: 0.88rem;
}

.little-law-calculator input {
  padding: 10px 12px;
  font-size: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
}

.little-law-calculator input:read-only {
  opacity: 0.6;
}

.little-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.little-actions .filter {
  font-size: 0.82rem;
  padding: 6px 12px;
}

.capacity-answer {
  margin: 16px 0 0;
  padding: 12px 16px;
  background: rgba(59,130,246,0.1);
  border-radius: 8px;
  font-size: 0.95rem;
}

.simple-examples {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

/* --- Trap Section (Nonlinearity) --- */
.nonlinear-lab {
  display: grid;
  gap: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
}

@media (min-width: 720px) {
  .nonlinear-lab {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

.curve-panel {
  min-height: 220px;
}

.curve-chart {
  height: 180px;
  background: var(--bg);
  border-radius: 12px;
  overflow: hidden;
}

.curve-axis {
  display: flex;
  justify-content: space-between;
  padding: 8px 12px;
  font-size: 0.75rem;
  color: var(--muted);
}

.nonlinear-explainer label {
  display: grid;
  gap: 10px;
}

.nonlinear-explainer input {
  width: 100%;
}

.wait-comparison {
  display: grid;
  gap: 16px;
  margin-top: 20px;
}

.wait-comparison article {
  padding: 14px 16px;
  background: var(--bg);
  border-radius: 10px;
}

.wait-comparison article span {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.wait-comparison article strong {
  font-size: 1.4rem;
}

/* --- Levers Section (Cache, Buffer, Batch) --- */
.levers-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.lever-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px 24px;
  display: grid;
  gap: 16px;
}

.lever-card header {
  display: grid;
  gap: 6px;
}

.lever-number {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.08em;
}

.lever-card h3 {
  font-size: 1.25rem;
  margin: 0;
}

.lever-card header > p {
  color: var(--muted);
  margin: 0;
  font-size: 0.95rem;
}

/* Lever visualizations */
.cache-viz,
.buffer-viz,
.batch-viz {
  position: relative;
  height: 160px;
  background: var(--bg);
  border-radius: 12px;
  overflow: hidden;
}

.viz-client,
.viz-cache,
.viz-origin,
.viz-producer,
.viz-buffer,
.viz-consumer,
.viz-clients,
.viz-batch-queue,
.viz-db {
  position: absolute;
  padding: 6px 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 0.75rem;
}

.viz-client,
.viz-producer,
.viz-clients {
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
}

.viz-cache,
.viz-buffer,
.viz-batch-queue {
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.viz-origin,
.viz-consumer,
.viz-db {
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
}

.viz-items,
#cacheItems,
#bufferItems,
#batchItems {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.viz-request,
.viz-buffer-item,
.viz-batch-item,
.viz-batched-request,
.viz-batch-response {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  transition: none;
}

.viz-request.hit {
  background: #4ade80;
}

.viz-request.miss {
  background: #fb923c;
}

.viz-batched-request {
  width: 60px;
  height: 20px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--accent), #60a5fa);
}

.viz-batch-response {
  background: #4ade80;
}

.lever-stats {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.8rem;
}

.lever-stats strong {
  font-size: 1.1rem;
  color: var(--text);
}

.lever-explanation {
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
}

/* --- Practice Section --- */
.lab-grid {
  display: grid;
  gap: 24px;
  margin-bottom: 40px;
}

.lab-grid > * {
  min-width: 0;
}

@media (min-width: 720px) {
  .lab-grid {
    grid-template-columns: 320px 1fr;
  }
}

.control-panel {
  display: grid;
  gap: 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px 24px;
  height: fit-content;
}

.control-panel label {
  display: grid;
  gap: 8px;
  font-size: 0.85rem;
}

.control-panel label strong {
  font-size: 1.1rem;
  font-weight: 600;
}

.control-panel input {
  width: 100%;
}

.queue-output {
  display: grid;
  gap: 20px;
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px 24px;
}

/* Lab canvases in module pages (OR, Security, Complexity, Economics, etc.) */
.module-learn #lab canvas {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  background: var(--bg);
  border-radius: 10px;
  border: 1px solid var(--line);
}

.health-card {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  background: var(--panel);
  border: 2px solid var(--line);
  border-radius: 12px;
}

.health-card span {
  font-size: 0.8rem;
  color: var(--muted);
}

.health-card strong {
  font-size: 1.5rem;
}

.health-card > p {
  margin: 4px 0 0;
  font-size: 0.9rem;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.result-grid article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
}

.result-grid article span {
  display: block;
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.result-grid article strong {
  font-size: 1.25rem;
}

.queue-visual {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
}

.queue-bar {
  height: 12px;
  background: var(--bg);
  border-radius: 6px;
  overflow: hidden;
}

.queue-bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, #4ade80, #fbbf24, #ef4444);
  transition: width 0.3s ease;
}

.queue-visual > p {
  margin: 8px 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}

/* --- Scenario Challenges --- */
.scenario-challenges h3 {
  font-size: 1.15rem;
  margin: 0 0 20px;
}

.challenge-list {
  display: grid;
  gap: 20px;
}

.challenge-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 24px;
}

.challenge-card h4 {
  font-size: 1.05rem;
  margin: 0 0 8px;
}

.challenge-card > p {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0 0 16px;
}

.quiz-options {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.quiz-options button {
  padding: 10px 16px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
}

.quiz-options button:hover {
  border-color: var(--accent);
}

.quiz-options button.selected.correct {
  background: rgba(74, 222, 128, 0.15);
  border-color: #4ade80;
}

.quiz-options button.selected.wrong {
  background: rgba(239, 68, 68, 0.15);
  border-color: #ef4444;
}

.quiz-feedback {
  margin: 12px 0 0;
  font-size: 0.9rem;
  min-height: 1.4em;
}

.quiz-feedback.correct {
  color: #4ade80;
}

.quiz-feedback.wrong {
  color: #ef4444;
}

/* --- Check Section --- */
.check-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin-bottom: 40px;
}

.check-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.check-icon {
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  background: rgba(74,222,128,0.15);
  border-radius: 50%;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.check-item p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.5;
}

.glossary-simple {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px 24px;
}

.glossary-simple h3 {
  font-size: 1rem;
  margin: 0 0 16px;
}

.glossary-list {
  display: grid;
  gap: 12px;
}

.glossary-list > div {
  display: grid;
  gap: 4px;
}

.glossary-list dt {
  font-weight: 600;
  font-size: 0.92rem;
}

.glossary-list dd {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

/* --- Footer --- */
.footer {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 28px clamp(16px, 4vw, 40px);
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer a {
  color: var(--accent);
  text-decoration: none;
}

/* --- Responsive Adjustments --- */
@media (max-width: 480px) {
  .module-toc {
    border-radius: 12px;
    justify-content: flex-start;
  }

  .formula {
    font-size: 1.8rem;
  }

  .result-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   MODULE 1 · QUEUEING THEORY — FLOW LAB
   ============================================ */
.q1-body { background: var(--bg); }

.q1-hero { padding-bottom: 32px; }
.q1-toc { display: flex; gap: 18px; flex-wrap: wrap; }
.q1-toc a { color: var(--muted); font-size: 0.9rem; }
.q1-toc a:hover { color: var(--accent-2); }

.q1-hero__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 32px;
  padding: 32px 24px 8px;
  align-items: center;
}
.q1-hero__grid h1 { font-size: clamp(2rem, 4vw, 3rem); }
.q1-hero__card {
  background: linear-gradient(140deg, rgba(59,130,246,0.10), rgba(167,139,250,0.08));
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px 24px;
}
.q1-hero__card dl { display: grid; gap: 10px; margin: 0; }
.q1-hero__card dl > div { display: grid; grid-template-columns: 48px 1fr; align-items: baseline; }
.q1-hero__card dt {
  font-weight: 700; color: var(--accent-2);
  font-family: 'Cambria Math', Georgia, serif; font-size: 1.2rem;
}
.q1-hero__card dd { margin: 0; color: var(--muted); font-size: 0.92rem; }

.q1-concept__cards {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  margin-top: 16px;
}
.q1-concept__cards article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
}
.q1-concept__cards article span {
  display: inline-block; padding: 3px 10px;
  background: rgba(96,165,250,0.12); color: var(--accent-2);
  border-radius: 999px; font-size: 0.78rem; font-weight: 600;
  margin-bottom: 10px;
}
.q1-concept__cards article h3 { font-size: 1.1rem; margin: 0 0 4px; }
.q1-concept__cards article p { color: var(--muted); font-size: 0.9rem; margin: 0; }

/* Lab */
.q1-lab {
  display: grid;
  grid-template-columns: 240px 1fr;
  grid-template-areas:
    "controls stage"
    "controls stats";
  gap: 18px;
  margin-top: 18px;
}
.q1-controls { grid-area: controls; }
.q1-stage    { grid-area: stage; min-width: 0; }
.q1-stats    { grid-area: stats; min-width: 0; }

.q1-controls {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  display: flex; flex-direction: column; gap: 14px;
  position: sticky; top: 16px; align-self: start;
}
.q1-control label {
  display: flex; justify-content: space-between; align-items: baseline;
  font-size: 0.85rem; color: var(--muted); margin-bottom: 6px;
}
.q1-control output { color: var(--text); font-weight: 700; font-size: 0.95rem; }
.q1-control input[type="range"] {
  width: 100%; accent-color: var(--accent);
  appearance: none; -webkit-appearance: none;
  height: 6px; background: var(--panel-2); border-radius: 999px; outline: none;
}
.q1-control input[type="range"]::-webkit-slider-thumb {
  appearance: none; -webkit-appearance: none;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent-2); border: 2px solid var(--bg);
  box-shadow: 0 0 0 4px rgba(96,165,250,0.15); cursor: pointer;
}
.q1-control input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent-2); border: 2px solid var(--bg); cursor: pointer;
}

.q1-buttons { display: flex; gap: 8px; }
.q1-buttons .button { flex: 1; padding: 8px 12px; font-size: 0.88rem; }

.q1-presets { display: flex; flex-direction: column; gap: 6px; }
.q1-presets .eyebrow { margin: 4px 0; }
.q1-presets button {
  background: var(--panel-2); color: var(--text);
  border: 1px solid var(--line); border-radius: 8px;
  padding: 7px 10px; font-size: 0.85rem; cursor: pointer;
  text-align: left; transition: border-color .15s, background .15s;
}
.q1-presets button:hover { border-color: var(--accent); }
.q1-presets button.active {
  background: rgba(59,130,246,0.15);
  border-color: var(--accent); color: var(--accent-2);
}

.q1-stage {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
  overflow: hidden;
}
.q1-stage canvas {
  width: 100%; height: 420px; display: block;
  border-radius: 8px;
}
.q1-legend {
  display: flex; gap: 16px; flex-wrap: wrap;
  margin-top: 10px; font-size: 0.82rem; color: var(--muted);
}
.q1-legend .dot {
  display: inline-block; width: 10px; height: 10px;
  border-radius: 50%; margin-right: 6px; vertical-align: middle;
}
.dot--arrival { background: #60a5fa; }
.dot--queued  { background: #a78bfa; }
.dot--serving { background: #f59e0b; }
.dot--dropped { background: #ef4444; }

.q1-stats {
  display: grid; gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}
.q1-stat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  transition: border-color .2s;
}
.q1-stat span { display: block; font-size: 0.78rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.q1-stat strong { display: block; font-size: 1.5rem; margin: 4px 0 2px; }
.q1-stat p { margin: 0; font-size: 0.78rem; color: var(--muted); }
.q1-stat--wide { grid-column: 1 / -1; }
.q1-stat--wide canvas { width: 100%; height: 60px; display: block; margin-top: 8px; background: var(--bg); border-radius: 6px; }
#q1-nonlinear-card canvas { height: 120px; }
#q1-nonlinear-card p {
  margin: 6px 0 0;
  font-size: 0.78rem;
  color: var(--accent);
}

.q1-scenario-grid {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-top: 16px;
}
.q1-scenario-grid article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  padding: 14px 16px;
}
.q1-scenario-grid h3 { margin: 0 0 6px; font-size: 1rem; }
.q1-scenario-grid p { margin: 0; color: var(--muted); font-size: 0.88rem; }

@media (max-width: 960px) {
  .q1-hero__grid { grid-template-columns: 1fr; }
  .q1-lab {
    grid-template-columns: 1fr;
    grid-template-areas: "controls" "stage" "stats";
  }
  .q1-controls { position: static; }
}

/* ============================================
   MODULE 2 — CONTROL THEORY / AUTOSCALER LAB
   ============================================ */

/* Override the standalone .module-toc positioning — inside nav.nav it should be inline */
.nav .module-toc {
  margin: 0;
  padding: 8px 14px;
  border-radius: 10px;
  background: transparent;
}

/* Canvas for the autoscaler time-series chart */
#ctrl-canvas {
  width: 100%;
  height: 420px;
  display: block;
  background: var(--bg);
  border-radius: 10px;
  border: 1px solid var(--line);
}

/* Preset buttons in the control panel */
.q1-presets button.active {
  background: rgba(59,130,246,0.15);
  border-color: var(--accent);
  color: var(--accent-2);
}

/* Ensure the health card status labels work */
#ctrl-healthLabel { transition: color 0.3s; }

/* Responsive: stack the lab on small screens */
@media (max-width: 719px) {
  .lab-grid {
    grid-template-columns: 1fr;
  }
}

/* ── Nyquist stability section — CREATIVE LIVING DIAGRAM ── */

/* Formula display */
.nyquist-hero {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 20px;
  padding: 16px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
}

.nyquist-formula {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 1.2rem;
  color: var(--text);
}

.nyq-fn-frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.nyq-bar {
  display: block;
  height: 2px;
  background: var(--accent);
  min-width: 90px;
  border-radius: 1px;
}

.nyq-num { font-size: 0.85rem; color: var(--accent-2); }
.nyq-den { font-size: 0.85rem; color: var(--muted); }

.nyquist-live {
  font-size: 0.88rem;
  color: var(--muted);
  padding: 8px 14px;
  background: var(--bg);
  border-radius: 8px;
  white-space: nowrap;
}

.nyquist-live strong { color: var(--accent-2); }

/* Layout */
.nyquist-lab {
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr 300px;
  align-items: start;
}

@media (max-width: 860px) {
  .nyquist-lab {
    grid-template-columns: 1fr;
  }
}

.nyquist-main {
  min-width: 0;
}

#nyquist-canvas {
  width: 100%;
  height: 460px;
  display: block;
  background: var(--bg);
  border-radius: 14px;
  border: 1px solid var(--line);
}

/* Side panel */
.nyquist-side {
  display: grid;
  gap: 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 20px;
  align-self: start;
}

.nyquist-side label {
  display: grid;
  gap: 6px;
  font-size: 0.85rem;
}

.nyquist-side label strong {
  font-size: 1.05rem;
  font-weight: 600;
}

.nyquist-side input {
  width: 100%;
}

#nyquist-gauge-canvas {
  width: 100%;
  height: 120px;
  display: block;
}

/* Presets */
.nyq-presets {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.nyq-presets button {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 0.85rem;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s, background 0.15s;
}

.nyq-presets button:hover {
  border-color: var(--accent);
}

.nyq-presets button.active {
  background: rgba(59,130,246,0.12);
  border-color: var(--accent);
  color: var(--accent-2);
}

/* Legend */
.nyquist-legend {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 12px;
  font-size: 0.82rem;
  color: var(--muted);
}

.nyquist-legend .dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: middle;
}

.nyq-dot-blue  { background: hsl(200,80%,58%); }
.nyq-dot-yellow{ background: hsl(100,80%,58%); }
.nyq-dot-red   { background: hsl(0,80%,58%); }

/* Metaphor cards */
.nyquist-metaphor-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr 1fr;
  margin-bottom: 24px;
}

@media (max-width: 700px) {
  .nyquist-metaphor-grid { grid-template-columns: 1fr; }
}

.nyquist-metaphor-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 22px;
}

.nyq-metaphor-icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.nyquist-metaphor-card h3 {
  font-size: 1.1rem;
  margin: 0 0 8px;
}

.nyquist-metaphor-card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
  margin: 0 0 8px;
}

.nyq-key {
  font-size: 0.85rem !important;
  color: var(--accent-2) !important;
  padding: 8px 12px;
  background: rgba(59,130,246,0.08);
  border-radius: 8px;
  border-left: 3px solid var(--accent);
}

/* 3-rule ribbon */
.nyquist-rules {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, 1fr);
  margin-bottom: 24px;
}

@media (max-width: 600px) {
  .nyquist-rules { grid-template-columns: 1fr; }
}

.nyq-rule {
  padding: 16px 18px;
  border-radius: 12px;
  border: 2px solid var(--line);
}

.nyq-rule strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 4px;
}

.nyq-rule span {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.5;
}

.nyq-rule-stable { border-color: #22c55e; }
.nyq-rule-stable strong { color: #22c55e; }

.nyq-rule-margin { border-color: #f59e0b; }
.nyq-rule-margin strong { color: #f59e0b; }

.nyq-rule-unstable { border-color: #ef4444; }
.nyq-rule-unstable strong { color: #ef4444; }

/* Microphone companion */
.nyq-mic-lab {
  display: grid;
  gap: 12px;
  margin-top: 16px;
  padding: 16px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  grid-template-columns: 1fr 220px;
  align-items: center;
}

@media (max-width: 700px) {
  .nyq-mic-lab { grid-template-columns: 1fr; }
}

.nyq-mic-stage {
  min-width: 0;
}

#nyq-mic-canvas {
  width: 100%;
  height: 120px;
  display: block;
  background: var(--bg);
  border-radius: 10px;
}

.nyq-mic-explainer strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 6px;
  transition: color 0.3s;
}

.nyq-mic-explainer p {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.55;
  margin: 0;
}

/* ============================================
   RELIABILITY THEORY MODULE
   ============================================ */

.rel-formula {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 10px 0 0;
  text-align: center;
}

.rel-check-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--muted);
  margin: 10px 0;
}

.rel-check-label input {
  width: auto;
}

.rel-cascade-note {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.55;
  margin: 12px 0 0;
}

.control-panel select {
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  font-size: 0.88rem;
  min-width: 160px;
}

#rel-canvas,
#rel-cascadeCanvas {
  width: 100%;
  height: auto;
  display: block;
  background: var(--bg);
  border-radius: 10px;
  border: 1px solid var(--line);
}

/* ============================================
   GAME THEORY MODULE
   ============================================ */

.gt-guide-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin-bottom: 20px;
}

.gt-guide-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
}

.gt-guide-card h3 {
  font-size: 1rem;
  margin: 0 0 10px;
}

.gt-guide-card ul,
.gt-guide-card ol {
  margin: 0;
  padding-left: 1.2rem;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.6;
}

.gt-guide-card li {
  margin-bottom: 6px;
}

.gt-bad {
  border-left: 4px solid #ef4444;
}

.gt-good {
  border-left: 4px solid #22c55e;
}

.gt-how {
  border-left: 4px solid var(--accent);
}

.gt-verdict-ribbon {
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--muted);
}

.gt-verdict-ribbon strong {
  color: var(--text);
}

.gt-verdict-label {
  color: var(--accent-2);
  font-weight: 600;
  margin-right: 6px;
}

.gt-toolkit-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin-bottom: 32px;
}

.gt-toolkit-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
}

.gt-toolkit-tag {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent-2);
}

.gt-toolkit-card h3 {
  font-size: 1rem;
  margin: 8px 0 10px;
}

.gt-toolkit-card p {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.55;
  margin: 0 0 10px;
}

.gt-toolkit-sys {
  font-size: 0.84rem;
  margin: 0;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.gt-fit-section {
  margin-top: 8px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.gt-fit-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.gt-fit-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
}

.gt-fit-card h3 {
  font-size: 1rem;
  margin: 0 0 12px;
}

.gt-fit-card ul {
  margin: 0;
  padding-left: 1.2rem;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.55;
}

.gt-fit-card li {
  margin-bottom: 8px;
}

.gt-fit-yes {
  border-left: 4px solid #22c55e;
}

.gt-fit-no {
  border-left: 4px solid #ef4444;
}

.gt-fit-note {
  font-size: 0.84rem;
  color: var(--muted);
  margin: 14px 0 0;
  line-height: 1.5;
}

.gt-path {
  margin-bottom: 28px;
  padding: 14px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow-x: auto;
}

.gt-path-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.gt-path-list a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.82rem;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line);
  background: rgba(59, 130, 246, 0.05);
}

.gt-path-list a:hover {
  color: var(--accent-2);
  border-color: var(--accent);
}

.gt-path-num {
  font-weight: 800;
  color: var(--accent-2);
  font-size: 0.78rem;
}

.gt-part {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-2);
  margin: 0 0 12px;
}

.gt-fund-fold {
  margin-top: 20px;
}

.gt-fund-fold > summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--accent-2);
  padding: 10px 0;
  list-style: none;
}

.gt-fund-fold > summary::-webkit-details-marker {
  display: none;
}

.gt-fund-fold[open] > summary {
  margin-bottom: 12px;
}

.gt-lab-extremes {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.gt-subhead {
  margin-bottom: 12px;
}

.gt-subhead h3 {
  font-size: 1rem;
  margin: 4px 0 0;
}

.gt-extreme-card h4 {
  font-size: 1rem;
  margin: 8px 0;
}

.gt-commons-quick {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}

.gt-commons-quick .eyebrow {
  margin: 0 8px 0 0;
}

.gt-concept-map {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px 18px;
  margin-bottom: 28px;
  overflow-x: auto;
}

.gt-map-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.05rem;
  margin: 0 0 16px;
  color: var(--text);
}

.gt-map-pin {
  font-size: 1.1rem;
}

.gt-map-tree,
.gt-map-tree ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.gt-map-tree > .gt-map-branch {
  margin-bottom: 14px;
}

.gt-map-tree > .gt-map-branch:last-child {
  margin-bottom: 0;
}

.gt-map-tree ul {
  padding-left: 1.25rem;
  margin-top: 6px;
  border-left: 2px solid rgba(59, 130, 246, 0.35);
}

.gt-map-branch-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent-2);
  text-decoration: none;
}

.gt-map-branch-link:hover {
  text-decoration: underline;
}

.gt-map-group > span {
  display: block;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--text);
  margin: 8px 0 4px;
}

.gt-map-tree > .gt-map-branch > ul > li {
  margin-bottom: 4px;
}

.gt-map-tree li:not(.gt-map-branch):not(.gt-map-group) {
  font-size: 0.86rem;
  color: var(--muted);
  line-height: 1.5;
  padding: 3px 0 3px 4px;
}

.gt-map-tree li a {
  color: var(--accent-2);
  text-decoration: none;
}

.gt-map-tree li a:hover {
  text-decoration: underline;
}

.gt-map-hint {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 0.84rem;
  color: var(--muted);
  line-height: 1.5;
}

.gt-fund-stack {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.gt-fund-block {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px;
}

.gt-fund-head {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 16px;
}

.gt-fund-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  border-radius: 10px;
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-2);
}

.gt-fund-head h3 {
  margin: 0 0 6px;
  font-size: 1.1rem;
}

.gt-fund-head p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.5;
}

.gt-fund-dl {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.gt-fund-dl > div {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.gt-fund-dl > div:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.gt-fund-dl dt {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 4px;
  color: var(--text);
}

.gt-fund-dl dd {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.55;
}

.gt-fund-quad {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  margin-bottom: 12px;
}

.gt-fund-quad-cell {
  background: rgba(59, 130, 246, 0.06);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
}

.gt-fund-quad-cell strong {
  display: block;
  font-size: 0.88rem;
  margin-bottom: 6px;
}

.gt-fund-quad-cell p {
  margin: 0;
  font-size: 0.84rem;
  color: var(--muted);
  line-height: 1.5;
}

.gt-fund-sys {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 0.86rem;
  color: var(--muted);
  line-height: 1.55;
}

.gt-glossary-table {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.gt-glossary-row {
  display: grid;
  grid-template-columns: 1.1fr 1.4fr 1fr;
  gap: 8px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 0.86rem;
  color: var(--muted);
}

.gt-glossary-row:last-child {
  border-bottom: none;
}

.gt-glossary-head {
  background: rgba(59, 130, 246, 0.1);
  font-weight: 700;
  color: var(--text);
}

.gt-extremes-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin-bottom: 20px;
}

.gt-extreme-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.15s;
}

.gt-extreme-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.gt-extreme-card h3 {
  margin: 8px 0;
  font-size: 1.05rem;
}

.gt-extreme-card p {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.55;
  margin: 0 0 12px;
}

.gt-extreme-tag {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  border-radius: 6px;
}

.gt-bad-tag { background: rgba(239, 68, 68, 0.2); color: #f87171; }
.gt-good-tag { background: rgba(34, 197, 94, 0.2); color: #4ade80; }
.gt-warn-tag { background: rgba(245, 158, 11, 0.2); color: #fbbf24; }

.gt-commons-extremes {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.gt-detail-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
  margin-bottom: 14px;
}

.gt-detail-panel h3 {
  margin: 4px 0 8px;
  font-size: 1.05rem;
}

.gt-detail-panel > p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
  margin: 0 0 12px;
}

.gt-detail-cells p {
  font-size: 0.82rem;
  color: var(--muted);
  margin: 0 0 6px;
  line-height: 1.5;
}

.gt-tag-nash {
  font-style: normal;
  color: #22c55e;
  font-weight: 700;
  margin-right: 6px;
}

.gt-tag-pareto {
  font-style: normal;
  color: #60a5fa;
  font-weight: 700;
  margin-right: 6px;
}

.gt-detail-verdicts p {
  font-size: 0.88rem;
  margin: 8px 0 0;
  line-height: 1.55;
  color: var(--muted);
}

.gt-detail-verdicts strong {
  color: var(--text);
}

@media (max-width: 720px) {
  .gt-glossary-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}

.gt-panel .gt-matrix-inputs {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.gt-cell-input {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.82rem;
}

.gt-cell-input span {
  display: block;
  color: var(--muted);
  margin-bottom: 6px;
  font-size: 0.75rem;
}

.gt-cell-input label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-right: 10px;
  color: var(--text);
}

.gt-cell-input input[type="number"] {
  width: 52px;
  padding: 4px 6px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: var(--text);
  font-size: 0.85rem;
}

.gt-strategy-labels {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.gt-strategy-labels label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--muted);
}

.gt-strategy-labels input[type="text"] {
  flex: 1;
  max-width: 140px;
  padding: 5px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: var(--text);
}

.gt-commons-grid {
  display: grid;
  grid-template-columns: minmax(200px, 260px) 1fr;
  gap: 18px;
  align-items: start;
}

.gt-commons-note {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.55;
  margin: 12px 0 0;
}

#gt-canvas,
#gt-commonsCanvas {
  width: 100%;
  height: auto;
  display: block;
  background: var(--bg);
  border-radius: 10px;
  border: 1px solid var(--line);
}

@media (max-width: 720px) {
  .gt-commons-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   FEEDBACK LOOP FREQUENCY DIAGRAM
   ============================================ */

.feedback-loop-section {
  margin-top: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 22px;
}

.feedback-loop-header {
  margin-bottom: 16px;
}

.feedback-loop-header h3 {
  font-size: 1.1rem;
  margin: 4px 0 8px;
}

.feedback-loop-header p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
  max-width: 64ch;
  margin: 0;
}

.feedback-loop-controls {
  display: flex;
  gap: 20px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.feedback-loop-controls label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--muted);
  flex: 1;
  min-width: 220px;
}

.feedback-loop-controls input[type="range"] {
  width: 160px;
}

.feedback-loop-controls strong {
  font-size: 1rem;
  color: var(--accent-2);
  min-width: 40px;
}

.fl-status {
  padding: 8px 14px;
  background: var(--bg);
  border-radius: 8px;
  border: 1px solid var(--line);
  min-width: 200px;
}

.fl-status strong {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 2px;
  transition: color 0.3s;
}

.fl-status span {
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.4;
}

#fl-canvas {
  width: 100%;
  height: auto;
  max-width: 440px;
  aspect-ratio: 440 / 300;
  display: block;
  background: var(--bg);
  border-radius: 10px;
  border: 1px solid var(--line);
  flex: 0 0 auto;
}

.fl-canvases-row {
  display: flex;
  gap: 10px;
  align-items: start;
  flex-wrap: wrap;
}

#fl-nyquist {
  width: 260px;
  height: 300px;
  flex-shrink: 0;
  display: block;
  background: var(--bg);
  border-radius: 10px;
  border: 1px solid var(--line);
}

/* ============================================
   AI & ML approaches section
   ============================================ */

.ai-methods-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
  margin-bottom: 36px;
}

.ai-method-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 22px;
  transition: border-color 0.2s, transform 0.15s;
}

.ai-method-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.ai-method-icon {
  font-size: 1.8rem;
  margin-bottom: 8px;
}

.ai-method-card h3 {
  font-size: 1.1rem;
  margin: 0 0 8px;
}

.ai-method-card > p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
  margin: 0 0 10px;
}

.ai-key {
  font-size: 0.85rem;
  color: var(--accent-2);
  padding: 8px 12px;
  background: rgba(59,130,246,0.08);
  border-radius: 8px;
  border-left: 3px solid var(--accent);
  margin-bottom: 10px;
  line-height: 1.5;
}

.ai-key strong {
  display: block;
  margin-bottom: 2px;
  color: var(--accent);
}

.ai-real {
  font-size: 0.85rem !important;
  color: var(--success) !important;
  padding: 8px 12px;
  background: rgba(34,197,94,0.08);
  border-radius: 8px;
  border-left: 3px solid var(--success);
  line-height: 1.5;
}

/* Comparison table */
.ai-compare-section {
  margin-bottom: 32px;
}

.ai-compare-section h3 {
  font-size: 1.15rem;
  margin: 0 0 16px;
}

.ai-compare-table {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
}

.ai-compare-header,
.ai-compare-row {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2px;
}

.ai-compare-header {
  background: rgba(59,130,246,0.12);
  border-bottom: 2px solid var(--line);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text);
}

.ai-compare-header span {
  padding: 12px 16px;
}

.ai-compare-row {
  border-bottom: 1px solid var(--line);
  font-size: 0.88rem;
}

.ai-compare-row:last-child {
  border-bottom: none;
}

.ai-compare-row span {
  padding: 10px 16px;
  color: var(--muted);
}

.ai-good {
  color: var(--success) !important;
}

.ai-warn {
  color: var(--warning) !important;
}

.ai-sub {
  font-size: 0.82rem !important;
  opacity: 0.8;
}

/* Hybrid future card */
.ai-hybrid-card {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  align-items: start;
  background: var(--panel);
  border: 2px solid var(--accent);
  border-radius: 14px;
  padding: 20px 24px;
}

.ai-hybrid-icon {
  font-size: 2rem;
  line-height: 1;
}

.ai-hybrid-card h3 {
  font-size: 1.15rem;
  margin: 0 0 8px;
}

.ai-hybrid-card p {
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.65;
  margin: 0;
}

@media (max-width: 600px) {
  .ai-compare-header,
  .ai-compare-row {
    grid-template-columns: 1fr 1fr 1fr;
    font-size: 0.78rem;
  }

  .ai-compare-header span,
  .ai-compare-row span {
    padding: 8px 10px;
  }

  .ai-hybrid-card {
    grid-template-columns: 1fr;
  }
}

/* --- Day 0 track, predict, quiz --- */
.day0-track {
  border-top: 1px solid var(--line);
}

.day0-incident-home,
.day0-strip {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  margin: 0 0 22px;
}

.day0-incident-home h3,
.day0-strip h3 {
  margin: 4px 0 8px;
  font-size: 1.15rem;
}

.day0-incident-home p,
.day0-strip p {
  margin: 0 0 8px;
  color: var(--muted);
  max-width: 72ch;
  line-height: 1.55;
}

.day0-strip-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
}

.day0-strip-nav a {
  font-size: 0.85rem;
}

.day0-cards {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.day0-card {
  display: block;
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s;
}

.day0-card:hover {
  border-color: var(--accent);
}

.day0-card span {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.day0-card strong {
  display: block;
  margin: 8px 0 6px;
  font-size: 1.15rem;
}

.day0-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.day0-card--done {
  border-color: #4ade80;
}

.day0-card--done span::after {
  content: " · ✓";
  color: #4ade80;
}

.predict-card,
.quiz-block {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  margin: 0 0 20px;
}

.predict-card .predict-q,
.quiz-item h3 {
  margin: 8px 0 12px;
  font-size: 1.02rem;
}

.quiz-item {
  margin: 0 0 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.quiz-score {
  font-weight: 600;
  margin: 0 0 10px;
}

.predict-cta {
  margin-top: 12px;
}

.quiz-options {
  flex-direction: column;
  align-items: stretch;
}

.quiz-options button {
  text-align: left;
}