:root {
  --cb-bg-deep: #0a0e17;
  --cb-bg: #0f1219;
  --cb-bg-light: #1a1f2b;
  --cb-card: #161b27;
  --cb-panel: rgba(255, 255, 255, 0.03);
  --cb-border: rgba(255, 255, 255, 0.06);
  --cb-border-strong: rgba(255, 255, 255, 0.12);
  --cb-text: #e8eef5;
  --cb-muted: #a8b5c9;
  --cb-muted-2: #7a85a0;
  --cb-gold: #f5b400;
  --cb-gold-strong: #ffd700;
  --cb-gold-border: rgba(245, 180, 0, 0.4);
  --cb-danger: #ff7b72;
  --cb-success: #58d68d;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--cb-bg-deep);
  color: var(--cb-text);
  line-height: 1.65;
}

button, select { font: inherit; }
a { color: var(--cb-gold-strong); }
a:hover { color: #ffe36d; }

.top {
  position: sticky;
  top: 0;
  z-index: 100;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(240px, 360px) auto;
  align-items: center;
  gap: 18px;
  padding: 12px max(18px, calc((100vw - 1400px) / 2 + 18px));
  background: rgba(9, 12, 16, 0.94);
  border-bottom: 1px solid var(--cb-border-strong);
}

.brand {
  width: 180px;
  height: 52px;
  overflow: hidden;
  background: url("../images/crew-blueprint-logo-master.jpeg") center -126px / 180px auto no-repeat;
  color: transparent;
  font-size: 0;
  white-space: nowrap;
}
.brand span { color: transparent; }
.top-title {
  margin-top: 2px;
  font-size: 12px;
  font-weight: 700;
  color: var(--cb-muted);
}

.progbox { width: 100%; }
.progrow {
  display: flex;
  justify-content: space-between;
  margin-bottom: 5px;
  color: var(--cb-muted-2);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.bar { height: 8px; overflow: hidden; background: #222b34; border-radius: 999px; }
.bar i { display: block; height: 100%; background: var(--cb-gold); transition: width 180ms ease; }

.exit-btn {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  padding: 8px 14px;
  border: 1px solid var(--cb-border-strong);
  border-radius: 8px;
  color: var(--cb-text);
  background: rgba(0, 0, 0, 0.35);
  font-size: 12px;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}
.exit-btn:hover { color: var(--cb-gold-strong); border-color: var(--cb-gold-border); }

.shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 22px;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 22px 18px 60px;
}
.side {
  position: sticky;
  top: 106px;
  align-self: start;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  padding: 14px;
  background: var(--cb-panel);
  border: 1px solid var(--cb-border-strong);
  border-radius: 16px;
}
.content {
  grid-column: 2;
  width: 100%;
  min-width: 0;
  margin: 0;
  padding: 0;
}

.mod {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 4px;
  padding: 9px;
  border-radius: 10px;
  color: var(--cb-muted);
}
.num {
  display: grid;
  flex: 0 0 28px;
  width: 28px;
  height: 28px;
  place-items: center;
  border-radius: 50%;
  background: var(--cb-bg-light);
  font-size: 12px;
  font-weight: 900;
}
.mod.active { background: #211d0e; color: var(--cb-text); border: 1px solid #65551f; }
.mod.active .num { background: var(--cb-gold); color: var(--cb-bg-deep); }
.module-title { color: var(--cb-text); font-size: 13px; font-weight: 800; line-height: 1.3; }
.module-count { color: var(--cb-muted-2); font-size: 11px; }
.sub { margin: 0 0 14px 23px; padding-left: 14px; border-left: 1px solid var(--cb-border); }
.lesson-link {
  display: block;
  width: 100%;
  min-height: 44px;
  padding: 7px 0;
  color: var(--cb-muted);
  background: none;
  border: 0;
  text-align: left;
  font-size: 12px;
  line-height: 1.4;
  cursor: pointer;
}
.lesson-link:hover, .lesson-link.active { color: var(--cb-gold-strong); }
.lesson-link.active { font-weight: 800; }
.lesson-link:focus-visible, .opt:focus-visible, .footer-nav-card:focus-visible,
.exit-btn:focus-visible, .mobile-select:focus-visible, .source-list a:focus-visible {
  outline: 2px solid var(--cb-gold-strong);
  outline-offset: 3px;
}

.mobile-select { display: none; }
.card {
  margin-bottom: 16px;
  padding: 22px;
  background: linear-gradient(var(--cb-bg-light), var(--cb-card));
  border: 1px solid var(--cb-border-strong);
  border-radius: 16px;
}
.card.progress { display: none; }

.course-training-visual {
  margin: 0 0 20px;
  overflow: hidden;
  border: 1px solid var(--cb-border-strong);
  border-radius: 14px;
  background: #0b1016;
}

.course-training-visual img {
  display: block;
  width: 100%;
  height: auto;
}

.course-training-visual figcaption {
  padding: 12px 15px;
  color: var(--cb-muted);
  font-size: 13px;
  line-height: 1.5;
}
.rule {
  margin-top: 14px;
  padding: 16px;
  border: 2px solid #66561f;
  border-radius: 12px;
  color: var(--cb-gold-strong);
  background: #211d0f;
  text-align: center;
  font-size: 14px;
  font-weight: 900;
}

.course-hero {
  margin-bottom: 16px;
  padding: 22px;
  background: linear-gradient(var(--cb-bg-light), var(--cb-card));
  border: 1px solid var(--cb-border-strong);
  border-radius: 16px;
}
.course-hero h1 { margin: 5px 0 10px; font-size: clamp(2rem, 4vw, 3rem); }
.course-hero .lead { margin: 0; font-size: 15px; }
.lesson-meta {
  margin-top: 3px;
  color: var(--cb-muted-2);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.tier-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 7px; }
.tier-pill {
  display: inline-flex;
  padding: 4px 9px;
  border: 1px solid var(--cb-gold-border);
  border-radius: 999px;
  color: var(--cb-gold-strong);
  background: rgba(245, 180, 0, 0.08);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.tier-pill.status { color: var(--cb-muted); border-color: var(--cb-border-strong); background: var(--cb-panel); }

h1, h2, h3, h4 { font-family: "Space Grotesk", Inter, sans-serif; }
h1 { margin: 0 0 14px; font-size: clamp(32px, 5vw, 48px); line-height: 1.02; letter-spacing: -0.035em; }
h2 { margin: 0 0 18px; font-size: clamp(26px, 4vw, 38px); line-height: 1.12; letter-spacing: -0.025em; }
h3 { margin: 24px 0 10px; color: var(--cb-gold-strong); font-size: 19px; }
h4 { margin: 0 0 8px; font-size: 15px; }
p { margin: 0 0 17px; }
ul, ol { margin: 0 0 18px 22px; padding: 0; }
li { margin-bottom: 8px; }
strong { color: var(--cb-gold-strong); }

.lead { color: var(--cb-muted); font-size: 18px; line-height: 1.65; }
.explainer, .authority, .stop-box, .practice-box, .evidence-box, .key-takeaway {
  margin: 18px 0;
  padding: 18px 20px;
  border-radius: 9px;
  background: var(--cb-panel);
  border-left: 4px solid var(--cb-gold);
}
.demo-box {
  margin: 18px 0;
  padding: 20px;
  border: 1px solid var(--cb-gold-border);
  border-radius: 12px;
  background: #0f141b;
}
.demo-box h3 { margin-top: 0; }
.demo-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}
.demo-step {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 5px 10px;
  align-items: center;
  min-height: 112px;
  padding: 14px;
  border: 1px solid var(--cb-border-strong);
  border-radius: 10px;
  background: var(--cb-card);
}
.demo-step-number {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 50%;
  color: var(--cb-bg-deep);
  background: var(--cb-gold);
  font-weight: 900;
}
.demo-step strong { color: var(--cb-text); }
.demo-step > span:last-child { grid-column: 1 / -1; color: var(--cb-muted); font-size: 13px; }
.cb-section { margin: 0 0 28px; }
.cb-panel {
  margin: 16px 0;
  padding: 18px 20px;
  border: 1px solid var(--cb-border-strong);
  border-radius: 10px;
  background: var(--cb-panel);
}
.cb-list { margin-left: 22px; }
.cb-diagram {
  margin: 24px 0;
  padding: 18px;
  overflow-x: auto;
  border: 1px solid var(--cb-border-strong);
  border-radius: 12px;
  background: #0f141b;
}
.cb-diagram svg { display: block; width: 100%; min-width: 360px; height: auto; }
.cb-diagram-label { display: block; margin-bottom: 12px; color: var(--cb-gold-strong); font-size: 11px; font-weight: 900; text-transform: uppercase; }
.cb-diagram-caption { display: block; margin-top: 12px; color: var(--cb-muted); font-size: 13px; }
.cb-quiz-list, .cb-drill-grid, .cb-glossary-list { display: grid; gap: 14px; }
.cb-drill-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.cb-quiz-item, .cb-glossary-item { padding: 16px; border: 1px solid var(--cb-border); border-radius: 9px; background: var(--cb-panel); }
.cb-glossary-item strong { display: block; margin-bottom: 4px; }
.cb-glossary-item span { color: var(--cb-muted); }
.authority { background: rgba(245, 180, 0, 0.07); }
.stop-box { border-left-color: var(--cb-danger); background: rgba(255, 123, 114, 0.07); }
.practice-box { border-left-color: var(--cb-success); background: rgba(88, 214, 141, 0.06); }
.evidence-box { border-left-color: #58a6ff; background: rgba(88, 166, 255, 0.06); }
.explainer > :last-child, .authority > :last-child, .stop-box > :last-child,
.practice-box > :last-child, .evidence-box > :last-child, .key-takeaway > :last-child { margin-bottom: 0; }

.split-grid, .three-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 18px 0;
}
.three-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.split-col {
  padding: 16px;
  border: 1px solid var(--cb-border);
  border-radius: 9px;
  background: var(--cb-panel);
}
.split-col ul { margin-bottom: 0; }

.sequence { counter-reset: sequence; list-style: none; margin-left: 0; }
.sequence li {
  position: relative;
  min-height: 42px;
  padding: 10px 12px 10px 50px;
  border-bottom: 1px solid var(--cb-border);
}
.sequence li::before {
  counter-increment: sequence;
  content: counter(sequence);
  position: absolute;
  left: 8px;
  top: 8px;
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border-radius: 50%;
  color: var(--cb-bg-deep);
  background: var(--cb-gold);
  font-size: 12px;
  font-weight: 900;
}

.quiz-block { margin: 18px 0 26px; }
.quiz-q { margin-bottom: 10px; color: var(--cb-text); font-weight: 800; }
.options { display: grid; gap: 8px; }
.opt {
  width: 100%;
  min-height: 44px;
  padding: 11px 13px;
  color: var(--cb-text);
  background: var(--cb-panel);
  border: 1px solid var(--cb-border-strong);
  border-radius: 8px;
  text-align: left;
  cursor: pointer;
}
.opt:hover:not(:disabled) { border-color: var(--cb-gold-border); background: rgba(245, 180, 0, 0.06); }
.opt.correct { border-color: var(--cb-success); background: rgba(88, 214, 141, 0.1); }
.opt.incorrect { border-color: var(--cb-danger); background: rgba(255, 123, 114, 0.1); }
.coach { display: none; margin-top: 9px; padding: 11px 13px; color: var(--cb-muted); background: var(--cb-panel); border-radius: 7px; font-size: 14px; }
.coach.show { display: block; }
.answer-result { color: var(--cb-text); }

.source-list { overflow-wrap: anywhere; }
.source-list li { margin-bottom: 12px; color: var(--cb-muted); }
.source-list a { font-weight: 700; }
.video-demo-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  margin: 2px 0 9px;
  padding: 10px 14px;
  color: var(--cb-bg-deep);
  background: var(--cb-gold);
  border-radius: 8px;
  font-weight: 900;
  text-decoration: none;
}
.video-demo-link:hover,
.video-demo-link:focus-visible { color: var(--cb-bg-deep); background: var(--cb-gold-strong); }
.video-demo-note { display: block; color: var(--cb-muted); font-size: 13px; }
.footer-nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 28px; }
.footer-nav-card {
  min-height: 94px;
  padding: 16px;
  color: var(--cb-text);
  background: var(--cb-card);
  border: 1px solid var(--cb-border-strong);
  border-radius: 10px;
  text-decoration: none;
}
.footer-nav-card:hover { border-color: var(--cb-gold-border); }
.footer-nav-card.next { grid-column: 2; }
.footer-nav-card .label { color: var(--cb-muted-2); font-size: 11px; font-weight: 900; text-transform: uppercase; }
.footer-nav-card h3 { margin: 7px 0 0; color: var(--cb-text); font-size: 16px; }

footer { padding: 24px; color: var(--cb-muted-2); border-top: 1px solid var(--cb-border); text-align: center; font-size: 12px; }

@media (max-width: 900px) {
  .top {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px 12px;
    padding: 8px 12px;
  }
  .top > div:first-child { min-width: 0; }
  .brand {
    width: 150px;
    height: 44px;
    background-size: 150px auto;
    background-position: center -105px;
  }
  .exit-btn { grid-column: 2; grid-row: 1; }
  .progbox { grid-column: 1 / -1; grid-row: 2; }
  .shell { display: block; min-height: 0; padding: 22px 18px 60px; }
  .side { display: none; }
  .content { padding: 0; }
  .cb-drill-grid { grid-template-columns: 1fr; }
  .mobile-select {
    display: block;
    width: 100%;
    margin-bottom: 12px;
    padding: 12px;
    color: var(--cb-text);
    background: var(--cb-card);
    border: 1px solid var(--cb-border-strong);
    border-radius: 11px;
    font-weight: 700;
  }
}

@media (max-width: 620px) {
  .top-title { max-width: 245px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .course-hero, .card { padding: 17px; }
  .split-grid, .three-grid, .footer-nav { grid-template-columns: 1fr; }
  .footer-nav-card.next { grid-column: 1; }
  h1 { font-size: 32px; }
  .course-hero .lead { font-size: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .bar i { transition: none; }
}