:root {
  --bg: #050505;
  --bg-2: #0c0c0c;
  --line: rgba(255, 255, 255, 0.12);
  --text: #fff;
  --muted: rgba(255, 255, 255, 0.64);
  --faint: rgba(255, 255, 255, 0.4);
  --ok: #5ddb8c;
  --font: Inter, -apple-system, BlinkMacSystemFont, sans-serif;
  --display: "Space Grotesk", Inter, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}
a { color: inherit; text-decoration: none; }
button, input { font: inherit; color: inherit; }
.cr-wrap { width: min(1040px, calc(100% - 40px)); margin: 0 auto; }
.cr-top {
  background: #fff;
  color: #000;
  text-align: center;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 10px 16px;
}
.cr-bar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 14px 20px;
  background: rgba(5, 5, 5, 0.92);
  border-bottom: 1px solid var(--line);
}
.cr-brand {
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 13px;
}
.cr-bar nav { display: flex; gap: 18px; margin-left: auto; font-size: 13px; color: var(--muted); }
.cr-bar nav a:hover { color: #fff; }
.cr-kicker {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ok);
  margin-bottom: 10px;
}
.cr-hero { padding: 72px 0 64px; border-bottom: 1px solid var(--line); }
.cr-hero h1, .cr-section h2, .mb-main h1, .mb-login h1 {
  font-family: var(--display);
  font-size: clamp(34px, 6vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}
.cr-lead { max-width: 620px; color: var(--muted); font-size: 18px; margin-bottom: 22px; }
.cr-price { display: flex; align-items: baseline; gap: 12px; margin-bottom: 8px; }
.cr-price s { color: var(--faint); font-size: 18px; }
.cr-price b { font-family: var(--display); font-size: 36px; }
.cr-note, .cr-fine { color: var(--faint); font-size: 13px; }
.cr-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.cr-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 20px;
  background: #fff;
  color: #000;
  border: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
}
.cr-btn:hover { background: #e8e8e8; }
.cr-btn-sm { padding: 9px 14px; font-size: 12px; }
.cr-btn-ghost { background: transparent; color: #fff; border: 1px solid var(--line); }
.cr-btn-ghost:hover { background: #111; }
.cr-section { padding: 72px 0; }
.cr-alt { background: var(--bg-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.cr-section h2 { max-width: 16ch; margin-bottom: 28px; }
.cr-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.cr-grid article {
  border: 1px solid var(--line);
  background: #0a0a0a;
  padding: 20px;
  min-height: 180px;
}
.cr-grid span { display: block; color: var(--faint); font-size: 12px; letter-spacing: 0.12em; margin-bottom: 10px; }
.cr-grid h3 { font-family: var(--display); font-size: 22px; margin-bottom: 8px; }
.cr-grid p, .cr-split p { color: var(--muted); }
.cr-split { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 32px; align-items: start; }
.cr-list { margin: 18px 0 22px; padding-left: 18px; color: var(--muted); }
.cr-list li + li { margin-top: 8px; }
.cr-card { border: 1px solid var(--line); padding: 22px; background: #090909; }
.cr-card .cr-fine { margin-top: 14px; }
.cr-foot { padding: 24px 0; font-size: 13px; color: var(--faint); }
.cr-foot .cr-wrap { display: flex; justify-content: space-between; gap: 16px; }

.member-site { min-height: 100vh; }
.mb-top {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 20;
}
.mb-who { margin-left: auto; font-size: 13px; color: var(--muted); }
.mb-menu { display: none; background: transparent; border: 1px solid var(--line); padding: 6px 10px; }
.mb-login { padding: 72px 0; }
.mb-login-card { max-width: 560px; }
.mb-login form { display: grid; gap: 12px; margin: 22px 0; }
.mb-login label { display: grid; gap: 6px; font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--faint); }
.mb-login input {
  border: 1px solid var(--line);
  background: #0a0a0a;
  padding: 12px 14px;
  text-transform: none;
  letter-spacing: 0;
  font-size: 15px;
  color: #fff;
}
.mb-err { color: #ff6b6b; font-size: 13px; }
.mb-app { display: grid; grid-template-columns: 280px 1fr; min-height: calc(100vh - 53px); }
.mb-side { border-right: 1px solid var(--line); padding: 18px 14px 40px; background: #080808; }
.mb-side h2 { font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--faint); margin: 16px 8px 8px; }
.mb-side h2:first-child { margin-top: 0; }
.mb-side a {
  display: block;
  padding: 8px 10px;
  font-size: 13px;
  color: var(--muted);
  border-radius: 4px;
}
.mb-side a:hover, .mb-side a.is-on { background: #141414; color: #fff; }
.mb-side a.is-done { color: var(--ok); }
.mb-main { padding: 36px 40px 80px; max-width: 820px; }
.mb-lesson { color: var(--muted); font-size: 16px; }
.mb-lesson h3 { color: #fff; font-family: var(--display); margin: 22px 0 10px; font-size: 22px; }
.mb-lesson p, .mb-lesson li { margin-bottom: 12px; }
.mb-lesson ul, .mb-lesson ol { padding-left: 20px; margin-bottom: 16px; }
.mb-lesson code { background: #151515; padding: 1px 6px; font-size: 13px; }
.mb-nav { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.mb-side-open .mb-side { display: block; position: fixed; inset: 53px 0 0 auto; width: min(320px, 100%); z-index: 15; overflow: auto; }

@media (max-width: 860px) {
  .cr-bar nav { display: none; }
  .cr-grid, .cr-split, .mb-app { grid-template-columns: 1fr; }
  .mb-side { display: none; }
  .mb-menu { display: inline-flex; }
  .mb-main { padding: 24px 20px 64px; }
  .cr-hero { padding: 48px 0; }
}