:root {
  --navy-950: #081f31;
  --navy-900: #102f47;
  --navy-800: #183f5b;
  --blue-700: #09658f;
  --cyan-600: #008fa8;
  --cyan-500: #13a8b8;
  --cyan-100: #dff5f7;
  --green-700: #147a68;
  --green-100: #e4f5ef;
  --gold-500: #d9a323;
  --gold-100: #fff5d8;
  --red-700: #a33d3d;
  --red-100: #fdeaea;
  --ink: #203444;
  --muted: #617585;
  --line: #d6e3e9;
  --surface: #ffffff;
  --surface-soft: #f5f9fb;
  --canvas: #edf4f7;
  --shadow-sm: 0 3px 12px rgba(8, 31, 49, .07);
  --shadow-lg: 0 18px 50px rgba(8, 31, 49, .13);
  --radius-sm: .65rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --sidebar: 18.5rem;
  --topbar: 4.5rem;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.62;
  text-rendering: optimizeLegibility;
}
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: var(--blue-700); }
svg { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: .6rem;
  left: .6rem;
  transform: translateY(-180%);
  padding: .65rem .9rem;
  border-radius: .55rem;
  background: #fff;
  color: var(--navy-900);
  font-weight: 750;
}
.skip-link:focus { transform: translateY(0); }

:focus-visible {
  outline: 3px solid #f2b92f;
  outline-offset: 3px;
}

.topbar {
  position: fixed;
  z-index: 100;
  top: 0;
  right: 0;
  left: 0;
  display: flex;
  align-items: center;
  min-height: var(--topbar);
  padding: .55rem 1.15rem;
  border-bottom: 1px solid rgba(255,255,255,.12);
  background: var(--navy-950);
  color: #fff;
  box-shadow: 0 4px 16px rgba(8,31,49,.22);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  color: #fff;
  text-decoration: none;
}
.brand-mark {
  display: grid;
  width: 2.8rem;
  height: 2.8rem;
  place-items: center;
  border: 1px solid rgba(255,255,255,.24);
  border-radius: .8rem;
  background: linear-gradient(145deg, rgba(19,168,184,.26), rgba(9,101,143,.12));
  color: #8be0e6;
}
.brand-mark svg { width: 2.15rem; height: 2.15rem; }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 1rem; letter-spacing: .01em; }
.brand small { color: #b7ccd8; font-size: .75rem; }
.topbar-progress {
  display: grid;
  width: min(20rem, 28vw);
  margin-left: auto;
  gap: .3rem;
  color: #ccdae2;
  font-size: .76rem;
}
.progress-track {
  overflow: hidden;
  height: .32rem;
  border-radius: 999px;
  background: rgba(255,255,255,.16);
}
.progress-track > span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #27bcc8, #77d8c3);
  transition: width .3s ease;
}
.topbar-actions { display: flex; align-items: center; gap: .35rem; margin-left: 1.2rem; }
.icon-button, .text-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.65rem;
  min-height: 2.65rem;
  border: 1px solid transparent;
  border-radius: .7rem;
  background: transparent;
  color: inherit;
  cursor: pointer;
}
.icon-button:hover, .text-button:hover { border-color: rgba(255,255,255,.2); background: rgba(255,255,255,.08); }
.icon-button svg, .text-button svg { width: 1.25rem; height: 1.25rem; }
.text-button { gap: .45rem; padding: .55rem .75rem; font-weight: 680; }
.mobile-only { display: none; }

.app-layout { min-height: 100vh; padding-top: var(--topbar); }
.sidebar {
  position: fixed;
  z-index: 80;
  top: var(--topbar);
  bottom: 0;
  left: 0;
  display: flex;
  width: var(--sidebar);
  flex-direction: column;
  overflow-y: auto;
  border-right: 1px solid var(--line);
  background: #fff;
}
.sidebar-summary {
  display: grid;
  grid-template-columns: 3.6rem 1fr;
  align-items: center;
  gap: .8rem;
  margin: 1rem;
  padding: .9rem;
  border-radius: .95rem;
  background: var(--surface-soft);
}
.sidebar-summary strong, .sidebar-summary small { display: block; }
.sidebar-summary small { margin-top: .15rem; color: var(--muted); font-size: .73rem; line-height: 1.35; }
.progress-ring {
  --progress: 0deg;
  display: grid;
  width: 3.5rem;
  height: 3.5rem;
  place-items: center;
  border-radius: 50%;
  background: radial-gradient(circle closest-side, #fff 75%, transparent 77%), conic-gradient(var(--cyan-600) var(--progress), #dce8ed 0);
  color: var(--navy-900);
  font-size: .78rem;
  font-weight: 800;
}
.sidebar nav { padding: 0 .7rem 1rem; }
.nav-home, .module-link {
  display: grid;
  grid-template-columns: 1.65rem 1fr auto;
  align-items: center;
  gap: .6rem;
  margin-bottom: .22rem;
  padding: .68rem .72rem;
  border-radius: .65rem;
  color: #385064;
  font-size: .88rem;
  font-weight: 650;
  line-height: 1.3;
  text-decoration: none;
}
.nav-home svg { width: 1.15rem; height: 1.15rem; }
.nav-home:hover, .module-link:hover { background: #edf6f8; color: var(--navy-900); }
.nav-home[aria-current="page"], .module-link[aria-current="page"] { background: var(--cyan-100); color: var(--navy-900); }
.module-number {
  display: grid;
  width: 1.55rem;
  height: 1.55rem;
  place-items: center;
  border: 1px solid #c8dbe3;
  border-radius: .45rem;
  background: #fff;
  color: var(--blue-700);
  font-size: .7rem;
  font-weight: 800;
}
.module-link.done .module-number { border-color: var(--green-700); background: var(--green-700); color: #fff; }
.module-link .nav-check { color: var(--green-700); font-size: .9rem; }
.nav-group-label {
  margin: 1rem .72rem .35rem;
  color: #7a8e9d;
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .075em;
  text-transform: uppercase;
}
.sidebar-footer {
  display: grid;
  gap: .6rem;
  margin-top: auto;
  padding: 1rem;
  border-top: 1px solid var(--line);
  background: #fbfdfe;
}
.sidebar-footer a, .sidebar-footer button {
  border: 0;
  background: transparent;
  color: var(--blue-700);
  cursor: pointer;
  font-size: .78rem;
  text-align: left;
  text-decoration: none;
}
.sidebar-footer button { color: #7c5960; }

main {
  width: calc(100% - var(--sidebar));
  max-width: 100rem;
  min-height: calc(100vh - var(--topbar));
  margin-left: var(--sidebar);
  padding: clamp(1.2rem, 3vw, 3.2rem);
}
.dashboard {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(19rem, .8fr);
  gap: clamp(1rem, 3vw, 2.4rem);
  align-items: stretch;
  padding: clamp(1.5rem, 4vw, 3.5rem);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #fff 0%, #f7fcfd 55%, #e4f4f2 100%);
  box-shadow: var(--shadow-lg);
}
.eyebrow {
  margin: 0 0 .45rem;
  color: var(--cyan-600);
  font-size: .76rem;
  font-weight: 820;
  letter-spacing: .08em;
  text-transform: uppercase;
}
h1, h2, h3, h4 { color: var(--navy-900); line-height: 1.18; text-wrap: balance; }
h1 { max-width: 54rem; margin: 0; font-size: clamp(2rem, 4.8vw, 4.2rem); letter-spacing: -.035em; }
h2 { margin: 0; font-size: clamp(1.55rem, 3vw, 2.45rem); letter-spacing: -.02em; }
h3 { font-size: clamp(1.15rem, 2vw, 1.45rem); }
h4 { font-size: 1.06rem; }
.lede { max-width: 51rem; margin: 1rem 0 0; color: #456072; font-size: clamp(1rem, 1.5vw, 1.16rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .7rem; margin-top: 1.45rem; }
.primary-button, .secondary-button, .danger-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.85rem;
  padding: .72rem 1rem;
  border: 1px solid transparent;
  border-radius: .72rem;
  cursor: pointer;
  font-weight: 750;
  line-height: 1.2;
  text-decoration: none;
}
.primary-button { background: var(--navy-900); color: #fff; box-shadow: 0 7px 18px rgba(16,47,71,.18); }
.primary-button:hover { background: #17445f; }
.secondary-button { border-color: #bad2dc; background: #fff; color: var(--navy-900); }
.secondary-button:hover { background: #eff7fa; }
.danger-button { background: var(--red-700); color: #fff; }
.boundary-note {
  display: grid;
  grid-template-columns: 1.5rem 1fr;
  gap: .7rem;
  margin-top: 1.55rem;
  padding: 1rem;
  border-left: 4px solid var(--gold-500);
  border-radius: 0 .8rem .8rem 0;
  background: var(--gold-100);
}
.boundary-note svg { width: 1.35rem; color: #9d7416; }
.boundary-note p { margin: 0; color: #604e23; font-size: .9rem; }
.phase-map {
  overflow: hidden;
  border: 1px solid #c9dfe5;
  border-radius: 1.2rem;
  background: rgba(255,255,255,.82);
  box-shadow: var(--shadow-sm);
}
.phase-map-head { display: flex; justify-content: space-between; padding: 1rem 1.1rem; background: var(--navy-900); color: #fff; font-size: .8rem; }
.phase-map ol { display: grid; margin: 0; padding: .75rem; list-style: none; }
.phase-map li { display: grid; grid-template-columns: 2.3rem 1fr; gap: .7rem; align-items: center; padding: .6rem .45rem; border-bottom: 1px solid #e3ecef; }
.phase-map li:last-child { border-bottom: 0; }
.phase-map li > span { display: grid; width: 2rem; height: 2rem; place-items: center; border-radius: 50%; background: var(--cyan-100); color: var(--blue-700); font-size: .7rem; font-weight: 850; }
.phase-map strong, .phase-map small { display: block; }
.phase-map strong { color: var(--navy-900); font-size: .88rem; }
.phase-map small { color: var(--muted); font-size: .73rem; }

.dashboard-section {
  margin-top: 1.4rem;
  padding: clamp(1.3rem, 3vw, 2.5rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
}
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 2rem; margin-bottom: 1.3rem; }
.section-heading > p { max-width: 38rem; margin: 0; color: var(--muted); }
.media-section { overflow: hidden; }
.media-resource-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.media-resource-card {
  min-width: 0;
  padding: clamp(1rem, 2vw, 1.35rem);
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: linear-gradient(180deg, #fff, #f8fbfc);
  box-shadow: var(--shadow-sm);
}
.media-resource-head { display: flex; align-items: center; justify-content: space-between; gap: .75rem; }
.media-resource-badge { color: var(--cyan-600); font-size: .72rem; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.media-resource-type { flex: 0 0 auto; padding: .3rem .55rem; border-radius: 999px; background: var(--cyan-100); color: var(--blue-700); font-size: .68rem; font-weight: 900; letter-spacing: .04em; }
.media-resource-card h3 { margin: .75rem 0 .4rem; color: var(--navy-900); font-size: clamp(1.15rem, 2vw, 1.42rem); }
.media-resource-card > p { min-height: 3.9rem; margin: 0 0 1rem; color: var(--muted); font-size: .9rem; }
.media-frame { overflow: hidden; width: 100%; border: 1px solid #c8dce4; border-radius: .85rem; background: #071822; }
.media-frame iframe { display: block; width: 100%; border: 0; }
.video-frame { aspect-ratio: 16 / 9; }
.video-frame iframe { height: 100%; }
.audio-frame { min-height: 352px; }
.audio-frame iframe { height: 352px; }
.media-embed-shell { position: relative; isolation: isolate; }
.media-poster {
  position: absolute;
  z-index: 2;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .85rem;
  padding: 1.25rem;
  color: #fff;
  text-align: center;
}
.media-poster[hidden] { display: none; }
.youtube-poster { background: radial-gradient(circle at 50% 15%, #244b66, #081f31 68%); }
.spotify-poster { background: radial-gradient(circle at 50% 15%, #1f715d, #082b27 68%); }
.media-play-icon, .media-audio-icon { display: grid; width: 3.5rem; height: 3.5rem; place-items: center; border: 1px solid rgba(255,255,255,.35); border-radius: 50%; background: rgba(255,255,255,.1); }
.media-play-icon svg, .media-audio-icon svg { width: 2rem; height: 2rem; stroke-width: 2; }
.media-poster strong, .media-poster span { display: block; }
.media-poster strong { font-size: 1rem; }
.media-poster div > span { color: #bcd3dc; font-size: .72rem; }
.media-load-button { min-height: 2.65rem; padding: .65rem 1rem; border: 1px solid rgba(255,255,255,.38); border-radius: .65rem; background: #fff; color: var(--navy-900); font-weight: 800; cursor: pointer; }
.media-load-button:hover { background: var(--cyan-100); }
.media-load-button:disabled { opacity: .72; cursor: wait; }
.media-direct-button { color: #bdebf0; font-size: .74rem; font-weight: 750; text-decoration: none; }
.media-direct-button:hover { color: #fff; text-decoration: underline; }
.media-open-fallback { min-height: 0 !important; margin: .65rem 0 0 !important; padding: .7rem .8rem; border-radius: .65rem; background: var(--surface-soft); color: var(--muted); font-size: .76rem !important; }
.media-open-fallback a { font-weight: 750; }
.media-source-note { margin: 1rem 0 0; padding: .9rem 1rem; border-left: 4px solid var(--cyan-600); border-radius: 0 .7rem .7rem 0; background: var(--cyan-100); color: #38576a; font-size: .82rem; }
.module-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr)); gap: .75rem; }
.module-card {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: .8rem;
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: .9rem;
  color: inherit;
  text-decoration: none;
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.module-card:hover { transform: translateY(-2px); border-color: #94c5d3; box-shadow: var(--shadow-sm); }
.module-card.done { border-color: #a9d7c9; background: #f7fcfa; }
.module-card-number { display: grid; width: 2.35rem; height: 2.35rem; place-items: center; border-radius: .7rem; background: var(--surface-soft); color: var(--blue-700); font-weight: 850; }
.module-card.done .module-card-number { background: var(--green-700); color: #fff; }
.module-card strong { display: block; color: var(--navy-900); line-height: 1.25; }
.module-card small { color: var(--muted); }
.module-card .module-meta { margin-top: .4rem; color: #6d8290; font-size: .72rem; }
.tool-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: .8rem; }
.tool-card { display: grid; grid-template-columns: 3rem 1fr auto; gap: .8rem; align-items: center; padding: 1rem; border: 1px solid var(--line); border-radius: .9rem; color: inherit; text-decoration: none; }
.tool-card:hover { background: var(--surface-soft); }
.tool-card > span:last-child { color: var(--cyan-600); font-size: 1.3rem; }
.tool-card strong { color: var(--navy-900); }
.tool-card p { margin: .2rem 0 0; color: var(--muted); font-size: .82rem; line-height: 1.4; }
.tool-icon { display: grid; width: 3rem; height: 3rem; place-items: center; border-radius: .75rem; background: var(--cyan-100); color: var(--blue-700); font-size: .72rem; font-weight: 900; letter-spacing: .02em; }

/* Lesson shell */
.lesson { max-width: 76rem; margin: 0 auto; }
.lesson-head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.5rem;
  align-items: start;
  padding: clamp(1.4rem, 3.5vw, 3rem);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--navy-900), #145c76);
  color: #fff;
  box-shadow: var(--shadow-lg);
}
.lesson-head h1 { max-width: 58rem; color: #fff; font-size: clamp(2rem, 4vw, 3.35rem); }
.lesson-head .eyebrow { color: #85e1e8; }
.lesson-head .lesson-summary { max-width: 54rem; margin: .8rem 0 0; color: #d8e8ee; }
.lesson-meta { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: 1rem; }
.lesson-meta span { padding: .35rem .6rem; border: 1px solid rgba(255,255,255,.2); border-radius: 999px; background: rgba(255,255,255,.08); color: #e4f0f4; font-size: .74rem; }
.complete-toggle { min-width: 11rem; border-color: rgba(255,255,255,.3); background: rgba(255,255,255,.08); color: #fff; }
.complete-toggle.done { border-color: #87d5bc; background: #daf4e9; color: #125b4d; }
.lesson-layout { display: grid; grid-template-columns: minmax(0, 1fr) 15rem; gap: 1.2rem; margin-top: 1.2rem; }
.lesson-body { display: grid; gap: 1rem; min-width: 0; }
.lesson-toc { position: sticky; top: calc(var(--topbar) + 1rem); align-self: start; padding: 1rem; border: 1px solid var(--line); border-radius: 1rem; background: #fff; box-shadow: var(--shadow-sm); }
.lesson-toc strong { color: var(--navy-900); font-size: .82rem; }
.lesson-toc a { display: block; margin-top: .55rem; color: var(--muted); font-size: .78rem; line-height: 1.35; text-decoration: none; }
.lesson-toc a:hover { color: var(--blue-700); }
.content-card {
  min-width: 0;
  padding: clamp(1.2rem, 2.7vw, 2.15rem);
  border: 1px solid var(--line);
  border-radius: 1.15rem;
  background: #fff;
  box-shadow: var(--shadow-sm);
}
.content-card > :first-child { margin-top: 0; }
.content-card > :last-child { margin-bottom: 0; }
.content-card h2 { scroll-margin-top: calc(var(--topbar) + 1rem); font-size: clamp(1.35rem, 2.5vw, 2rem); }
.content-card h3 { margin: 1.5rem 0 .6rem; }
.content-card p { margin: .75rem 0; }
.content-card ul, .content-card ol { padding-left: 1.35rem; }
.content-card li { margin: .45rem 0; }
.objectives { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem),1fr)); gap: .7rem; margin-top: 1rem; }
.objective { display: grid; grid-template-columns: 1.5rem 1fr; gap: .55rem; padding: .8rem; border: 1px solid #dce9ed; border-radius: .75rem; background: var(--surface-soft); font-size: .88rem; }
.objective span { display: grid; width: 1.35rem; height: 1.35rem; place-items: center; border-radius: 50%; background: var(--green-100); color: var(--green-700); font-size: .72rem; font-weight: 900; }
.callout { display: grid; grid-template-columns: 1.7rem 1fr; gap: .7rem; margin: 1rem 0; padding: 1rem; border-left: 4px solid var(--cyan-600); border-radius: 0 .8rem .8rem 0; background: #eef9fa; }
.callout.warning { border-color: var(--gold-500); background: var(--gold-100); }
.callout.danger { border-color: var(--red-700); background: var(--red-100); }
.callout.success { border-color: var(--green-700); background: var(--green-100); }
.callout-icon { display: grid; width: 1.6rem; height: 1.6rem; place-items: center; border-radius: 50%; background: #fff; color: var(--navy-900); font-size: .8rem; font-weight: 850; }
.callout p { margin: 0; font-size: .9rem; }
.compare-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: .7rem; margin: 1rem 0; }
.compare-panel { padding: 1rem; border: 1px solid var(--line); border-radius: .85rem; }
.compare-panel.good { border-top: 5px solid var(--green-700); }
.compare-panel.bad { border-top: 5px solid var(--red-700); }
.compare-panel h3 { margin: 0 0 .55rem; font-size: 1rem; }
.compare-panel p, .compare-panel li { font-size: .88rem; }
.formula { padding: 1rem; border: 1px dashed #9bbdc9; border-radius: .8rem; background: #f7fbfc; color: var(--navy-900); font-weight: 650; }
.micro-label { color: var(--cyan-600); font-size: .72rem; font-weight: 850; letter-spacing: .065em; text-transform: uppercase; }

.diagram-flow { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: .5rem; margin: 1.2rem 0; }
.diagram-node { min-width: 8.5rem; padding: .8rem; border: 1px solid #bad3dc; border-radius: .75rem; background: #fff; color: var(--navy-900); text-align: center; font-size: .84rem; font-weight: 730; }
.diagram-arrow { color: var(--cyan-600); font-weight: 900; }
.evidence-chain { display: grid; grid-template-columns: repeat(6,minmax(0,1fr)); gap: .35rem; margin: 1rem 0; }
.evidence-chain > div { position: relative; padding: .8rem .55rem; border-radius: .65rem; background: #eaf5f7; color: var(--navy-900); font-size: .75rem; font-weight: 760; text-align: center; }
.evidence-chain > div:not(:last-child)::after { content: "›"; position: absolute; z-index: 2; right: -.35rem; top: 50%; transform: translateY(-50%); color: var(--cyan-600); font-size: 1.25rem; }
.concept-wheel { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: .55rem; margin: 1rem 0; }
.concept-wheel div { min-width: 0; padding: .85rem; border-top: 4px solid var(--cyan-600); border-radius: .75rem; background: var(--surface-soft); }
.concept-wheel strong { display: block; color: var(--navy-900); font-size: .86rem; }
.concept-wheel span { display: block; margin-top: .2rem; color: var(--muted); font-size: .76rem; }
.timeline { position: relative; display: grid; gap: .75rem; margin: 1rem 0; }
.timeline::before { content: ""; position: absolute; top: 1rem; bottom: 1rem; left: 1.05rem; width: 2px; background: #c5dde4; }
.timeline-step { position: relative; display: grid; grid-template-columns: 2.2rem 1fr; gap: .8rem; }
.timeline-step > span { z-index: 1; display: grid; width: 2.15rem; height: 2.15rem; place-items: center; border-radius: 50%; background: var(--navy-900); color: #fff; font-size: .72rem; font-weight: 850; }
.timeline-step > div { padding: .8rem 1rem; border: 1px solid var(--line); border-radius: .8rem; background: #fff; }
.timeline-step strong { color: var(--navy-900); }
.timeline-step p { margin: .2rem 0 0; color: var(--muted); font-size: .84rem; }

.responsive-table { overflow-x: auto; margin: 1rem 0; border: 1px solid var(--line); border-radius: .85rem; }
table { width: 100%; border-collapse: collapse; font-size: .86rem; }
th, td { padding: .75rem; border-bottom: 1px solid var(--line); vertical-align: top; text-align: left; }
th { background: var(--navy-900); color: #fff; font-size: .76rem; letter-spacing: .02em; }
tr:last-child td { border-bottom: 0; }
tbody tr:nth-child(even) { background: #f8fbfc; }

.accordion { display: grid; gap: .55rem; margin: 1rem 0; }
.accordion details { border: 1px solid var(--line); border-radius: .8rem; background: #fff; }
.accordion summary { cursor: pointer; padding: .9rem 1rem; color: var(--navy-900); font-weight: 760; }
.accordion details[open] summary { border-bottom: 1px solid var(--line); background: var(--surface-soft); }
.accordion-content { padding: .35rem 1rem 1rem; }
.form-badge { display: inline-grid; min-width: 2.7rem; height: 1.65rem; margin-right: .55rem; place-items: center; border-radius: .4rem; background: var(--navy-900); color: #fff; font-size: .72rem; }

.quiz { margin-top: 1rem; padding: 1.1rem; border: 1px solid #bcd5df; border-radius: .9rem; background: #f5fafc; }
.quiz h3 { margin: 0 0 .2rem; }
.quiz-question { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid #dbe8ed; }
.quiz-question fieldset { margin: 0; padding: 0; border: 0; }
.quiz-question legend { color: var(--navy-900); font-weight: 730; }
.quiz-option { display: grid; grid-template-columns: 1.2rem 1fr; gap: .5rem; align-items: start; margin-top: .5rem; padding: .55rem .65rem; border: 1px solid #d9e5e9; border-radius: .55rem; background: #fff; cursor: pointer; }
.quiz-option:hover { border-color: #91c4d1; }
.quiz-feedback { margin: .8rem 0 0; font-size: .86rem; font-weight: 650; }
.quiz-feedback.correct { color: var(--green-700); }
.quiz-feedback.incorrect { color: var(--red-700); }

.lab-grid { display: grid; grid-template-columns: minmax(0,1fr) minmax(17rem,.7fr); gap: .8rem; margin: 1rem 0; }
.lab-case, .lab-controls { padding: 1rem; border: 1px solid var(--line); border-radius: .85rem; background: #fff; }
.lab-quote { margin: .7rem 0; padding: .8rem; border-left: 4px solid var(--cyan-600); background: var(--surface-soft); font-style: italic; }
.lab-controls label { display: block; margin-top: .65rem; color: var(--navy-900); font-size: .8rem; font-weight: 730; }
.lab-controls select, .planner input, .planner select, .planner textarea, .search-field input, .glossary-category select {
  width: 100%;
  min-height: 2.75rem;
  margin-top: .3rem;
  padding: .65rem .75rem;
  border: 1px solid #afc8d2;
  border-radius: .6rem;
  background: #fff;
  color: var(--ink);
}
.lab-result { margin-top: .75rem; padding: .75rem; border-radius: .6rem; background: var(--surface-soft); font-size: .84rem; }

.civ-calculator { margin-top: 1rem; }
.civ-grid { overflow-x: auto; border: 1px solid var(--line); border-radius: .85rem; }
.civ-grid table { min-width: 46rem; }
.civ-grid select { min-width: 5.4rem; padding: .45rem; border: 1px solid #adc5cf; border-radius: .5rem; background: #fff; }
.civ-output { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: .65rem; margin-top: .75rem; }
.civ-score { padding: .8rem; border: 1px solid var(--line); border-radius: .75rem; background: var(--surface-soft); text-align: center; }
.civ-score strong, .civ-score span { display: block; }
.civ-score strong { color: var(--navy-900); font-size: 1.45rem; }
.civ-score span { color: var(--muted); font-size: .73rem; }
.civ-score.global { border-color: #a6d4c5; background: var(--green-100); }

.checklist { display: grid; gap: .5rem; margin: 1rem 0; }
.check-item { display: grid; grid-template-columns: 1.25rem 1fr; gap: .55rem; align-items: start; padding: .7rem .8rem; border: 1px solid var(--line); border-radius: .65rem; background: #fff; }
.check-item input { width: 1.1rem; height: 1.1rem; margin-top: .15rem; accent-color: var(--green-700); }
.check-item strong { color: var(--navy-900); }
.check-item small { display: block; color: var(--muted); }
.planner { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: .8rem; margin-top: 1rem; }
.planner label { color: var(--navy-900); font-size: .8rem; font-weight: 730; }
.planner .full { grid-column: 1 / -1; }
.planner-output { white-space: pre-wrap; margin-top: 1rem; padding: 1rem; border: 1px dashed #9dbbc7; border-radius: .8rem; background: #f7fbfc; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .78rem; }

.lesson-nav { display: flex; justify-content: space-between; gap: 1rem; margin-top: 1.2rem; }
.lesson-nav a { max-width: 48%; }
.source-note { margin-top: 1rem; padding: .85rem 1rem; border-radius: .8rem; background: #eaf3f6; color: #486173; font-size: .78rem; }

/* Especialización v2 */
.specialization-overview { background: linear-gradient(150deg, #fff 0%, #f2faf9 100%); }
.specialization-stats { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: .75rem; margin-top: 1rem; }
.specialization-stats > div { padding: 1rem; border: 1px solid #cce1e3; border-radius: .9rem; background: rgba(255,255,255,.82); text-align: center; }
.specialization-stats strong, .specialization-stats span { display: block; }
.specialization-stats strong { color: var(--blue-700); font-size: 2rem; line-height: 1; }
.specialization-stats span { margin-top: .35rem; color: var(--muted); font-size: .78rem; font-weight: 700; }
.learning-contract { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr; align-items: center; gap: .55rem; margin-top: 1rem; padding: 1rem; border-radius: .9rem; background: var(--navy-900); color: #fff; }
.learning-contract > div { min-width: 0; }
.learning-contract strong, .learning-contract span { display: block; }
.learning-contract > div > span { color: #c9dce5; font-size: .74rem; }
.learning-contract > span { color: #71d2d7; font-weight: 900; }
.portfolio-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-top: 1rem; padding: 1rem; border: 1px dashed #9bbdc9; border-radius: .9rem; background: #fff; }
.portfolio-toolbar p { margin: .2rem 0 0; color: var(--muted); font-size: .82rem; }
.portfolio-toolbar .hero-actions { flex-shrink: 0; }

.specialization-band { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin: -1.25rem -1.25rem 1.2rem; padding: .7rem 1.25rem; border-radius: 1rem 1rem 0 0; background: linear-gradient(90deg, var(--navy-900), var(--blue-700)); color: #fff; font-size: .78rem; }
.specialization-band span { color: #aee7e7; font-weight: 800; text-transform: uppercase; letter-spacing: .04em; }
.specialization-band strong { text-align: right; }
.deep-blocks { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: .8rem; }
.deep-block { padding: 1rem; border: 1px solid var(--line); border-top: 5px solid var(--cyan-600); border-radius: .85rem; background: #fff; }
.deep-block h3 { margin-top: 0; color: var(--navy-900); }
.deep-block p { color: #344b5c; font-size: .9rem; }

.decision-steps { display: grid; gap: .65rem; margin: 1rem 0 0; padding: 0; list-style: none; counter-reset: none; }
.decision-steps li { display: grid; grid-template-columns: 2.25rem 1fr; align-items: center; gap: .7rem; padding: .7rem; border: 1px solid var(--line); border-radius: .75rem; background: var(--surface-soft); }
.decision-steps li > span { display: grid; width: 2rem; height: 2rem; place-items: center; border-radius: 50%; background: var(--cyan-600); color: #fff; font-size: .78rem; font-weight: 850; }
.decision-steps p { margin: 0; }

.case-dossier { margin: 1rem 0; padding: 1rem; border: 1px solid #9ecbd3; border-radius: .9rem; background: linear-gradient(145deg, #f2fbfc, #fff); }
.case-tag { display: inline-block; padding: .25rem .55rem; border-radius: 999px; background: var(--green-100); color: var(--green-700); font-size: .66rem; font-weight: 850; letter-spacing: .04em; }
.case-dossier h3 { margin: .65rem 0 .2rem; }
.case-dossier p { font-size: .88rem; }
.case-evidence { margin-top: .8rem; border-top: 1px solid var(--line); }
.case-evidence summary { cursor: pointer; padding: .75rem 0 0; color: var(--blue-700); font-weight: 760; }
.case-evidence blockquote { margin: .75rem 0 0; padding: .8rem; border-left: 4px solid var(--cyan-600); background: #fff; }
.case-evidence blockquote strong { font-size: .72rem; color: var(--blue-700); }
.case-evidence blockquote p { margin: .25rem 0 0; }
.worked-example { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: .7rem; margin-top: 1rem; }
.worked-example > div { position: relative; padding: 1rem; border-radius: .85rem; background: var(--surface-soft); }
.worked-example > div > span { display: grid; width: 1.7rem; height: 1.7rem; place-items: center; border-radius: .45rem; background: var(--navy-900); color: #fff; font-size: .72rem; font-weight: 850; }
.worked-example h3 { margin: .65rem 0 .3rem; font-size: .95rem; }
.worked-example p { margin: 0; font-size: .84rem; }
.counterexample { margin-top: 1rem; padding: 1rem; border: 1px solid #edc8c8; border-left: 5px solid var(--red-700); border-radius: .8rem; background: #fff8f8; }
.counterexample p { margin: .45rem 0; font-size: .87rem; }

.practice-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: .8rem; }
.guided-practice, .independent-practice { padding: 1rem; border: 1px solid var(--line); border-radius: .9rem; }
.guided-practice { background: #f3fafc; }
.independent-practice { background: #fff; border-top: 5px solid var(--green-700); }
.practice-level { color: var(--cyan-600); font-size: .68rem; font-weight: 850; letter-spacing: .05em; text-transform: uppercase; }
.practice-grid h3 { margin: .55rem 0; font-size: 1rem; }
.guided-practice li, .guided-practice p, .independent-practice p { font-size: .86rem; }
.guided-practice details { margin-top: .8rem; padding: .7rem; border-radius: .65rem; background: #fff; }
.guided-practice summary { cursor: pointer; color: var(--blue-700); font-weight: 750; }
.independent-practice label { display: block; color: var(--navy-900); font-size: .78rem; font-weight: 750; }
.portfolio-entry { width: 100%; margin-top: .4rem; padding: .7rem; border: 1px solid #acc8d2; border-radius: .65rem; resize: vertical; }
.autosave-note { color: var(--muted); font-size: .72rem !important; }
.ambiguity-title { margin-top: 1.2rem; }
.ambiguity-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: .55rem; }
.ambiguity-grid details { padding: .75rem; border: 1px solid var(--line); border-radius: .7rem; background: #fff; }
.ambiguity-grid summary { cursor: pointer; color: var(--navy-900); font-size: .84rem; font-weight: 750; }
.ambiguity-grid p { font-size: .82rem; }

.form-tabs { display: grid; gap: .65rem; margin-top: 1rem; }
.form-workshop { overflow: hidden; border: 1px solid #bfd6de; border-radius: .9rem; background: #fff; }
.form-workshop > summary { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: .6rem; padding: .9rem 1rem; cursor: pointer; }
.form-workshop > summary strong, .form-workshop > summary small { display: block; }
.form-workshop > summary small { color: var(--muted); font-size: .74rem; font-weight: 500; }
.form-workshop[open] > summary { border-bottom: 1px solid var(--line); background: #f4fafb; }
.form-workshop-body { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: .8rem; padding: 1rem; }
.workshop-field { display: flex; min-width: 0; flex-direction: column; color: var(--navy-900); font-size: .78rem; font-weight: 760; }
.workshop-field b { color: var(--red-700); }
.workshop-field input, .workshop-field textarea, .workshop-field select { width: 100%; min-height: 2.7rem; margin-top: .3rem; padding: .65rem; border: 1px solid #aec8d2; border-radius: .6rem; background: #fff; color: var(--ink); font-weight: 450; }
.workshop-field textarea { resize: vertical; }
.workshop-field small { margin-top: .25rem; color: var(--muted); font-size: .7rem; font-weight: 450; }
.form-actions { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: .6rem; padding-top: .4rem; border-top: 1px solid var(--line); }
.form-actions .text-button { color: var(--blue-700); font-size: .78rem; }

.rubric-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: .55rem; }
.rubric-grid label { display: flex; min-width: 0; flex-direction: column; justify-content: space-between; padding: .7rem; border: 1px solid var(--line); border-radius: .7rem; background: var(--surface-soft); color: var(--navy-900); font-size: .75rem; font-weight: 720; }
.rubric-grid select { width: 100%; margin-top: .45rem; padding: .45rem; border: 1px solid #abc5cf; border-radius: .5rem; background: #fff; }
.rubric-help { margin-top: .8rem; padding: .8rem; border: 1px solid var(--line); border-radius: .7rem; }
.rubric-help summary { cursor: pointer; color: var(--blue-700); font-weight: 760; }
.rubric-help p, .rubric-help li { font-size: .8rem; }
.critical-attestation { display: grid; grid-template-columns: 1.2rem 1fr; gap: .6rem; margin-top: .8rem; padding: .85rem; border: 1px solid #dfc374; border-radius: .7rem; background: var(--gold-100); font-size: .84rem; font-weight: 680; }
.critical-attestation input { width: 1.1rem; height: 1.1rem; accent-color: var(--green-700); }

.mastery-form { display: grid; gap: .8rem; }
.mastery-form fieldset { margin: 0; padding: .9rem; border: 1px solid var(--line); border-radius: .8rem; }
.mastery-form legend { display: flex; align-items: center; gap: .5rem; padding: 0 .3rem; color: var(--navy-900); font-weight: 760; }
.mastery-form legend > span { display: grid; width: 1.65rem; height: 1.65rem; flex: 0 0 auto; place-items: center; border-radius: 50%; background: var(--navy-900); color: #fff; font-size: .68rem; }
.mastery-form fieldset > label { display: grid; grid-template-columns: 1.1rem 1fr; gap: .5rem; margin-top: .5rem; padding: .55rem; border-radius: .55rem; background: var(--surface-soft); cursor: pointer; font-size: .84rem; }
.mastery-explanation { margin: .55rem 0 0; font-size: .78rem; font-weight: 650; }
.mastery-explanation.correct { color: var(--green-700); }
.mastery-explanation.incorrect { color: var(--red-700); }
.mastery-result { padding: .85rem; border-radius: .7rem; background: var(--gold-100); }
.mastery-result.passed { background: var(--green-100); color: #0b5d4e; }

.completion-requirements { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .9rem; }
.completion-requirements span { padding: .3rem .55rem; border: 1px solid rgba(255,255,255,.28); border-radius: 999px; color: #d5e2e8; font-size: .7rem; font-weight: 720; }
.completion-requirements span.met { border-color: #75d5b8; background: rgba(44,164,131,.22); color: #d9fff3; }
.toc-divider { display: block; margin-top: .7rem; padding-top: .65rem; border-top: 1px solid var(--line); color: var(--cyan-600); font-size: .68rem; font-weight: 850; letter-spacing: .05em; text-transform: uppercase; }

.dialog {
  width: min(48rem, calc(100% - 2rem));
  max-height: min(48rem, calc(100vh - 2rem));
  padding: 0;
  border: 0;
  border-radius: 1.1rem;
  box-shadow: 0 25px 80px rgba(0,0,0,.28);
}
.dialog::backdrop { background: rgba(8,31,49,.58); backdrop-filter: blur(3px); }
.dialog-head { display: flex; align-items: start; justify-content: space-between; gap: 1rem; padding: 1.2rem 1.25rem; border-bottom: 1px solid var(--line); }
.dialog-head h2 { font-size: 1.55rem; }
.dialog-head .icon-button { color: var(--navy-900); font-size: 1.6rem; }
.glossary-dialog { width: min(60rem, calc(100% - 2rem)); overflow: hidden; }
.glossary-dialog[open] { display: flex; flex-direction: column; }
.glossary-guide { margin: 1rem 1.25rem 0; padding: .85rem 1rem; border: 1px solid #b9dae3; border-radius: .85rem; background: linear-gradient(135deg,#eef9fb,#f5fbf8); color: var(--navy-900); }
.glossary-guide p { margin: 0; font-size: .86rem; line-height: 1.55; }
.glossary-quick { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .7rem; }
.glossary-quick button { padding: .35rem .58rem; border: 1px solid #84bdcc; border-radius: 999px; background: #fff; color: var(--blue-700); cursor: pointer; font-size: .72rem; font-weight: 820; }
.glossary-quick button:hover, .glossary-quick button:focus-visible { border-color: var(--cyan-600); background: #e5f7fa; }
.glossary-controls { display: grid; grid-template-columns: minmax(0,1.6fr) minmax(13rem,.8fr); gap: .75rem; padding: .85rem 1.25rem .35rem; }
.glossary-controls .search-field, .glossary-category { display: block; padding: 0; color: var(--navy-900); font-size: .78rem; font-weight: 730; }
.glossary-count { margin: .25rem 1.25rem .4rem; color: var(--muted); font-size: .74rem; font-weight: 720; }
.glossary-list { display: grid; min-height: 0; gap: .55rem; overflow-y: auto; padding: .25rem 1.25rem 1.25rem; }
.glossary-entry { margin: 0; padding: .85rem; border: 1px solid var(--line); border-radius: .75rem; background: #fff; }
.glossary-entry-head { display: flex; align-items: start; justify-content: space-between; gap: .7rem; }
.glossary-entry dt { color: var(--navy-900); font-weight: 780; }
.glossary-entry-head span { flex: 0 0 auto; padding: .2rem .45rem; border-radius: 999px; background: var(--surface-soft); color: var(--blue-700); font-size: .62rem; font-weight: 780; letter-spacing: .02em; }
.glossary-entry dd { margin: .25rem 0 0; color: var(--muted); font-size: .88rem; }
.glossary-empty { margin: 0; padding: 1rem; border-radius: .75rem; background: var(--gold-100); color: var(--navy-900); }
.confirm-dialog > p { padding: 0 1.25rem; }
.dialog-actions { display: flex; justify-content: end; gap: .6rem; padding: 1rem 1.25rem 1.25rem; }
.toast { position: fixed; z-index: 200; right: 1rem; bottom: 1rem; transform: translateY(160%); max-width: 24rem; padding: .8rem 1rem; border-radius: .75rem; background: var(--navy-950); color: #fff; box-shadow: var(--shadow-lg); transition: transform .2s ease; }
.toast.show { transform: translateY(0); }
.noscript { margin: 6rem 1rem 1rem; padding: 1rem; background: var(--gold-100); }

@media (max-width: 1120px) {
  :root { --sidebar: 16.5rem; }
  .topbar-progress { display: none; }
  .dashboard { grid-template-columns: 1fr; }
  .phase-map ol { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .phase-map li { border-right: 1px solid #e3ecef; }
  .tool-grid { grid-template-columns: 1fr; }
  .lesson-layout { grid-template-columns: 1fr; }
  .lesson-toc { position: static; order: -1; display: flex; flex-wrap: wrap; gap: .35rem .8rem; }
  .lesson-toc strong { width: 100%; }
  .lesson-toc a { margin: 0; }
}

@media (max-width: 820px) {
  :root { --topbar: 4rem; }
  .mobile-only { display: inline-flex; }
  .topbar { padding: .45rem .65rem; }
  .brand-mark { width: 2.55rem; height: 2.55rem; }
  .brand small { display: none; }
  .text-button { min-width: 2.65rem; padding: .55rem; }
  .text-button svg { margin: 0; }
  .text-button { font-size: 0; }
  .sidebar { transform: translateX(-105%); width: min(20rem, 88vw); transition: transform .2s ease; }
  .sidebar.open { transform: translateX(0); }
  .sidebar-backdrop { position: fixed; z-index: 70; inset: var(--topbar) 0 0; display: block; background: rgba(8,31,49,.52); }
  .sidebar-backdrop[hidden] { display: none; }
  main { width: 100%; margin-left: 0; padding: 1rem; }
  .dashboard { padding: 1.2rem; }
  .phase-map ol { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .section-heading { display: block; }
  .section-heading > p { margin-top: .5rem; }
  .media-resource-card > p { min-height: 0; }
  .lesson-head { grid-template-columns: 1fr; }
  .complete-toggle { width: 100%; }
  .evidence-chain { grid-template-columns: repeat(3,minmax(0,1fr)); }
  .concept-wheel { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .civ-output { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .specialization-stats { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .learning-contract { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .learning-contract > span { display: none; }
  .portfolio-toolbar { align-items: stretch; flex-direction: column; }
  .deep-blocks, .worked-example, .practice-grid { grid-template-columns: 1fr; }
  .rubric-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .brand strong { font-size: .86rem; }
  .topbar-actions { margin-left: auto; }
  h1 { font-size: 2.15rem; }
  main { padding: .7rem; }
  .dashboard, .dashboard-section, .content-card, .lesson-head { border-radius: 1rem; }
  .media-resource-grid { grid-template-columns: 1fr; }
  .audio-frame { min-height: 250px; }
  .audio-frame iframe { height: 250px; }
  .media-poster { padding: 1rem; }
  .phase-map ol { grid-template-columns: 1fr; }
  .phase-map li { border-right: 0; }
  .module-grid, .objectives, .compare-grid, .lab-grid, .planner { grid-template-columns: 1fr; }
  .planner .full { grid-column: auto; }
  .concept-wheel { grid-template-columns: 1fr; }
  .evidence-chain { grid-template-columns: 1fr; }
  .evidence-chain > div:not(:last-child)::after { content: "↓"; top: auto; right: 50%; bottom: -.8rem; transform: translateX(50%); }
  .civ-output { grid-template-columns: 1fr 1fr; }
  .lesson-nav { flex-direction: column; }
  .lesson-nav a { max-width: none; }
  .specialization-stats, .learning-contract, .ambiguity-grid, .form-workshop-body, .rubric-grid { grid-template-columns: 1fr; }
  .specialization-band { align-items: flex-start; flex-direction: column; }
  .specialization-band strong { text-align: left; }
  .portfolio-toolbar .hero-actions, .portfolio-toolbar button { width: 100%; }
  .form-actions { grid-column: auto; flex-direction: column; }
  .form-actions button, .form-actions .text-button { width: 100%; font-size: .78rem; }
  .glossary-dialog { width: calc(100% - 1rem); max-height: calc(100vh - 1rem); }
  .glossary-guide { margin: .7rem .8rem 0; }
  .glossary-controls { grid-template-columns: 1fr; padding: .7rem .8rem .3rem; }
  .glossary-count { margin-inline: .8rem; }
  .glossary-list { padding: .25rem .8rem .8rem; }
  .glossary-entry-head { flex-direction: column; gap: .35rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}

@media print {
  body { background: #fff; color: #000; }
  .topbar, .sidebar, .sidebar-backdrop, .lesson-toc, .lesson-nav, .complete-toggle, .toast, .quiz button, .civ-calculator button, .planner button, .form-actions, .check-mastery { display: none !important; }
  main { width: 100%; max-width: none; margin: 0; padding: 0; }
  .lesson { max-width: none; }
  .lesson-head { padding: 1.2rem; background: #fff; color: #000; box-shadow: none; border: 2px solid #17324a; }
  .lesson-head h1, .lesson-head .lesson-summary, .lesson-head .eyebrow { color: #000; }
  .lesson-layout { display: block; }
  .content-card { break-inside: avoid; box-shadow: none; margin-top: .7rem; }
  a { color: #000; text-decoration: none; }
}