/*
 * umbra.css — Design System Umbra Labs
 * Source unique de vérité pour toutes les pages du site.
 * v2.0.0 — Spectre
 *
 * TABLE DES MATIÈRES
 * 1.  Tokens CSS (custom properties)
 * 2.  Reset & Base
 * 3.  Backgrounds & Effets
 * 4.  Typographie
 * 5.  Navigation (.u-nav)
 * 6.  Progress bar (.u-progress-bar)
 * 7.  Layout (.u-page-wrapper, .u-sidebar)
 * 8.  Hero (.u-hero)
 * 9.  Sections & Chapitres
 * 10. Cards (.u-card)
 * 11. Prose (.u-prose)
 * 12. Badges (.u-badge)
 * 13. Code blocks (.u-code-block)
 * 14. Callouts (.u-callout)
 * 15. Blockquote cypherpunk (.u-blockquote-cypher)
 * 16. Step list (.u-step-list)
 * 17. Checklist (.u-checklist)
 * 18. Glossary (.u-glossary)
 * 19. FAQ (.u-faq)
 * 20. Content grid (.u-content-grid)
 * 21. Mode toggle (.u-mode-toggle)
 * 22. Filter bar (.u-filter-bar)
 * 23. Footer (.u-footer)
 * 24. Animations & utilitaires
 * 25. Responsive
 * 26. Illustrations SVG (.u-illu)
 * 27. Parcours débutant (.u-journey)
 * 28. Email Gate (.u-gate)
 * 29. Lang toggle (.u-lang-btn)
 * 30. Sandbox toggle (.u-sandbox-toggle)
 * 31. Completion badge (.u-completion-badge)
 */

/* ═══════════════════════════════════════════════════════════════════════════
   1. TOKENS CSS
   ═══════════════════════════════════════════════════════════════════════════ */
:root {
  /* Spectre — fond noir pur, accent cyan unique */
  --u-bg:       #000000;
  --u-surface:  #0a0a0a;
  --u-panel:    #111111;
  --u-border:   #1f1f1f;
  --u-hover:    #1a1a1a;

  /* Accent unique : cyan */
  --u-accent:   #22d3ee;
  --u-accent-d: #06b6d4;
  --u-cyan:     #22d3ee;   /* alias maintenu pour compatibilité */

  /* Couleurs sémantiques — conservées */
  --u-green:    #34d399;
  --u-red:      #f87171;
  --u-violet:   #a78bfa;
  --u-pink:     #f472b6;

  /* Texte */
  --u-text:     #e4e4e7;
  --u-muted:    #71717a;
  --u-dim:      #27272a;

  /* Typographie */
  --u-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --u-sans: 'Inter', system-ui, -apple-system, sans-serif;

  /* Espacements */
  --u-space-xs:  0.375rem;
  --u-space-sm:  0.75rem;
  --u-space-md:  1.25rem;
  --u-space-lg:  2rem;
  --u-space-xl:  3rem;

  /* Rayons */
  --u-radius-sm: 0.375rem;
  --u-radius:    0.625rem;
  --u-radius-lg: 1rem;

  /* Effets */
  --u-glow:        0 0 20px rgba(34,211,238,0.12), 0 0 0 1px rgba(34,211,238,0.15);
  --u-glow-cyan:   0 0 20px rgba(34,211,238,0.10), 0 0 0 1px rgba(34,211,238,0.12);
  --u-glow-green:  0 0 20px rgba(52,211,153,0.10),  0 0 0 1px rgba(52,211,153,0.12);
  --u-transition:  all 0.2s ease;
}

/* ═══════════════════════════════════════════════════════════════════════════
   2. RESET & BASE
   ═══════════════════════════════════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--u-bg);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='matrix' values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0.04 0'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-attachment: fixed;
  background-size: 200px 200px;
  color: var(--u-text);
  font-family: var(--u-sans);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(34,211,238,0.2); color: #fff; }

::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: var(--u-bg); }
::-webkit-scrollbar-thumb { background: var(--u-border); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--u-accent); }

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

img { max-width: 100%; height: auto; }
code { font-family: var(--u-mono); font-size: 0.875em; color: var(--u-cyan); }
strong { color: var(--u-text); font-weight: 600; }

/* ═══════════════════════════════════════════════════════════════════════════
   3. BACKGROUNDS & EFFETS
   ═══════════════════════════════════════════════════════════════════════════ */

/* Grille de fond subtile */
.u-bg-grid {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(34,211,238,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34,211,238,0.015) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* Dégradés radiaux */
.u-bg-mesh {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 70% 50% at 10% 0%,  rgba(34,211,238,0.04) 0%, transparent 55%),
    radial-gradient(ellipse 50% 40% at 90% 100%, rgba(34,211,238,0.03) 0%, transparent 50%);
}

/* Conteneur principal au-dessus des effets */
.u-content { position: relative; z-index: 1; }

/* Glass morphism */
.u-glass {
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--u-border);
  transition: var(--u-transition);
}
.u-glass:hover { border-color: rgba(34,211,238,0.2); }

/* ═══════════════════════════════════════════════════════════════════════════
   4. TYPOGRAPHIE
   ═══════════════════════════════════════════════════════════════════════════ */
.u-label {
  font-family: var(--u-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--u-muted);
}

/* alias maintenus pour rétrocompatibilité HTML existant */
.u-label--amber  { color: var(--u-accent); }
.u-label--cyan   { color: var(--u-cyan); }
.u-label--accent { color: var(--u-accent); }

.u-mono { font-family: var(--u-mono); }

/* Utilitaire couleur accent */
.u-accent { color: var(--u-accent); }

/* ═══════════════════════════════════════════════════════════════════════════
   5. NAVIGATION
   ═══════════════════════════════════════════════════════════════════════════ */
.u-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  gap: 1rem;
  background: rgba(0,0,0,0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--u-border);
}

.u-nav__brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--u-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--u-text);
  text-decoration: none;
  white-space: nowrap;
}
.u-nav__brand img {
  height: 28px;
  width: auto;
  display: block;
  object-fit: contain;
}

.u-nav__brand::before {
  content: '';
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--u-accent);
  box-shadow: 0 0 6px var(--u-accent);
  animation: u-pulse 2s ease-in-out infinite;
  flex-shrink: 0;
}

.u-nav__links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.u-nav__link {
  font-family: var(--u-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.35rem 0.75rem;
  border-radius: var(--u-radius-sm);
  color: var(--u-muted);
  text-decoration: none;
  transition: var(--u-transition);
  border: 1px solid transparent;
}
.u-nav__link:hover,
.u-nav__link--active {
  color: var(--u-text);
  border-color: var(--u-border);
  background: var(--u-panel);
  text-decoration: none;
}

.u-nav__actions { display: flex; align-items: center; gap: 0.75rem; }

/* ═══════════════════════════════════════════════════════════════════════════
   6. PROGRESS BAR
   ═══════════════════════════════════════════════════════════════════════════ */
.u-progress-bar {
  position: fixed;
  top: 0; left: 0;
  z-index: 100;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--u-accent-d), var(--u-accent));
  transition: width 0.1s linear;
}

/* ═══════════════════════════════════════════════════════════════════════════
   7. LAYOUT
   ═══════════════════════════════════════════════════════════════════════════ */
.u-page-wrapper {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.u-page-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* SIDEBAR */
.u-sidebar {
  display: none;
  position: sticky;
  top: 72px;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  padding: 1.5rem 0;
  align-self: start;
}

.u-sidebar__title {
  font-family: var(--u-mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--u-muted);
  margin-bottom: 0.625rem;
  padding-left: 0.75rem;
}

.u-sidebar__link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--u-mono);
  font-size: 0.7rem;
  padding: 0.4rem 0.75rem;
  color: var(--u-muted);
  text-decoration: none;
  border-radius: var(--u-radius-sm);
  border-left: 2px solid transparent;
  transition: var(--u-transition);
}
.u-sidebar__link:hover {
  color: var(--u-text);
  background: var(--u-panel);
  text-decoration: none;
}
.u-sidebar__link.active {
  color: var(--u-accent);
  border-left-color: var(--u-accent);
  background: rgba(34,211,238,0.05);
}

.u-sidebar__num {
  font-size: 0.6rem;
  color: var(--u-muted);
  min-width: 1.25rem;
}

.u-sidebar__progress {
  font-family: var(--u-mono);
  font-size: 0.62rem;
  color: var(--u-muted);
  padding: 0.75rem 0.75rem 0;
  border-top: 1px solid var(--u-border);
  margin-top: 0.625rem;
  line-height: 1.6;
}
.u-sidebar__progress strong { color: var(--u-accent); font-weight: 700; }

.u-share-progress {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  margin-top: 0.75rem;
  padding: 0.35rem 0.75rem;
  background: rgba(34,211,238,0.07);
  border: 1px solid rgba(34,211,238,0.2);
  color: var(--u-accent);
  font-family: var(--u-mono);
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-radius: var(--u-radius-sm);
  cursor: pointer;
  transition: var(--u-transition);
  width: 100%;
  justify-content: center;
}
.u-share-progress:hover { background: rgba(34,211,238,0.14); }
.u-share-progress.copied { color: var(--u-green); border-color: rgba(52,211,153,0.3); background: rgba(52,211,153,0.07); }

.u-video-intro {
  background: var(--u-surface);
  border: 1px solid var(--u-border);
  border-radius: var(--u-radius);
  overflow: hidden;
  margin-bottom: 1.5rem;
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--u-transition);
  position: relative;
}
.u-video-intro:hover { border-color: rgba(34,211,238,0.3); }
.u-video-intro iframe { width: 100%; height: 100%; border: none; }
.u-video-intro__placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  color: var(--u-muted);
  font-family: var(--u-mono);
  text-align: center;
  padding: 2rem;
}
.u-video-intro__play {
  width: 52px; height: 52px;
  background: rgba(34,211,238,0.12);
  border: 1px solid rgba(34,211,238,0.25);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem;
  color: var(--u-accent);
}
.u-video-intro__label { font-size: 0.72rem; color: var(--u-text); font-weight: 600; }
.u-video-intro__sub { font-size: 0.62rem; color: var(--u-muted); }

/* ═══════════════════════════════════════════════════════════════════════════
   8. HERO
   ═══════════════════════════════════════════════════════════════════════════ */
.u-hero {
  padding: var(--u-space-xl) 0 var(--u-space-lg);
  border-bottom: 1px solid var(--u-border);
  margin-bottom: var(--u-space-xl);
}

.u-hero__eyebrow {
  font-family: var(--u-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: var(--u-accent);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.u-hero__eyebrow::before { content: '//'; color: var(--u-muted); font-size: 0.75rem; }

.u-hero__title {
  font-size: clamp(1.75rem, 4vw, 3.25rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.025em;
  color: #fff;
  margin-bottom: 1rem;
}
.u-hero__title .u-accent { color: var(--u-accent); }

.u-hero__desc {
  font-size: 1rem;
  color: var(--u-muted);
  max-width: 640px;
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

.u-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
  margin-bottom: 1.5rem;
}

/* ═══════════════════════════════════════════════════════════════════════════
   9. SECTIONS & CHAPITRES
   ═══════════════════════════════════════════════════════════════════════════ */
.u-section {
  margin-bottom: 3.5rem;
  scroll-margin-top: 80px;
}

.u-section-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--u-border);
}

.u-section-num {
  font-family: var(--u-mono);
  font-size: 0.65rem;
  font-weight: 700;
  width: 2rem; height: 2rem;
  border-radius: var(--u-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(34,211,238,0.08);
  border: 1px solid rgba(34,211,238,0.2);
  color: var(--u-accent);
  flex-shrink: 0;
}

.u-section-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.01em;
}

.u-section-duration {
  font-family: var(--u-mono);
  font-size: 0.65rem;
  color: var(--u-muted);
  margin-left: auto;
  white-space: nowrap;
}

.u-prereq-box {
  background: var(--u-panel);
  border: 1px solid var(--u-border);
  border-radius: var(--u-radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
}

.u-prereq-box__title {
  font-family: var(--u-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--u-accent);
  margin-bottom: 0.75rem;
}

.u-prereq-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.u-prereq-list li {
  font-size: 0.875rem;
  color: var(--u-text);
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  line-height: 1.5;
}
.u-prereq-list li::before {
  content: '▸';
  color: var(--u-accent);
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.u-chapter-objective {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0.875rem 1.25rem;
  border-left: 3px solid var(--u-accent);
  background: rgba(34,211,238,0.04);
  border-radius: 0 var(--u-radius-sm) var(--u-radius-sm) 0;
  margin-bottom: 1.5rem;
}
.u-chapter-objective__label {
  font-family: var(--u-mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--u-accent);
  font-weight: 700;
}
.u-chapter-objective p:last-child {
  font-size: 0.9rem;
  color: var(--u-text);
  font-weight: 500;
  margin: 0;
  line-height: 1.55;
}

/* ═══════════════════════════════════════════════════════════════════════════
   10. CARDS
   ═══════════════════════════════════════════════════════════════════════════ */
.u-card {
  background: var(--u-panel);
  border: 1px solid var(--u-border);
  border-radius: var(--u-radius);
  padding: 1.5rem;
  transition: var(--u-transition);
}
.u-card:hover { border-color: rgba(34,211,238,0.2); }

.u-card--tutorial {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  text-decoration: none;
  cursor: pointer;
}
.u-card--tutorial:hover { transform: translateY(-2px); text-decoration: none; }

.u-card__title {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  line-height: 1.4;
}

.u-card__desc {
  font-size: 0.85rem;
  color: var(--u-muted);
  line-height: 1.65;
  flex: 1;
}

.u-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px solid var(--u-border);
}

/* ═══════════════════════════════════════════════════════════════════════════
   11. PROSE
   ═══════════════════════════════════════════════════════════════════════════ */
.u-prose p {
  color: var(--u-muted);
  font-size: 0.925rem;
  margin-bottom: 1rem;
  line-height: 1.8;
}

.u-prose strong { color: var(--u-text); font-weight: 600; }
.u-prose em     { color: var(--u-cyan); font-style: normal; }

.u-prose h3 {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  margin: 1.75rem 0 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  letter-spacing: -0.01em;
}
.u-prose h3::before {
  content: '//';
  font-family: var(--u-mono);
  font-size: 0.75rem;
  color: var(--u-accent);
  font-weight: 400;
}

/* ═══════════════════════════════════════════════════════════════════════════
   12. BADGES
   ═══════════════════════════════════════════════════════════════════════════ */
.u-badge {
  display: inline-flex;
  align-items: center;
  font-family: var(--u-mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: 0.25rem;
  border: 1px solid;
  white-space: nowrap;
}

/* amber alias → accent pour rétrocompatibilité HTML */
.u-badge--amber   { background: rgba(34,211,238,0.08);  border-color: rgba(34,211,238,0.25);  color: var(--u-accent); }
.u-badge--cyan    { background: rgba(34,211,238,0.08);  border-color: rgba(34,211,238,0.25);  color: var(--u-cyan); }
.u-badge--green   { background: rgba(52,211,153,0.08);  border-color: rgba(52,211,153,0.25);  color: var(--u-green); }
.u-badge--red     { background: rgba(248,113,113,0.08); border-color: rgba(248,113,113,0.25); color: var(--u-red); }
.u-badge--violet  { background: rgba(167,139,250,0.08); border-color: rgba(167,139,250,0.25); color: var(--u-violet); }
.u-badge--neutral { background: rgba(113,113,122,0.15); border-color: var(--u-border);         color: var(--u-muted); }

/* ═══════════════════════════════════════════════════════════════════════════
   13. CODE BLOCKS
   ═══════════════════════════════════════════════════════════════════════════ */
.u-code-block {
  position: relative;
  margin: 1.25rem 0;
  border-radius: var(--u-radius);
  overflow: hidden;
  border: 1px solid var(--u-border);
}

.u-code-block__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background: rgba(0,0,0,0.45);
  border-bottom: 1px solid var(--u-border);
}

.u-code-block__lang {
  font-family: var(--u-mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--u-muted);
}

.u-copy-btn {
  font-family: var(--u-mono);
  font-size: 0.58rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--u-border);
  border-radius: 0.25rem;
  background: transparent;
  color: var(--u-muted);
  cursor: pointer;
  transition: var(--u-transition);
}
.u-copy-btn:hover { border-color: var(--u-accent); color: var(--u-accent); }
.u-copy-btn.copied { border-color: var(--u-green); color: var(--u-green); }

.u-code-block pre {
  padding: 1.125rem 1.25rem;
  background: #020408;
  overflow-x: auto;
  font-family: var(--u-mono);
  font-size: 0.8rem;
  line-height: 1.75;
  color: #a8c4d0;
}

/* Syntax highlighting */
.u-code-block .t-cmd  { color: var(--u-green); }
.u-code-block .t-cmt  { color: var(--u-muted); font-style: italic; }
.u-code-block .t-kw   { color: var(--u-violet); }
.u-code-block .t-str  { color: #97c4a0; }
.u-code-block .t-var  { color: var(--u-cyan); }
.u-code-block .t-out  { color: #5a7a8a; }

/* Curseur clignotant terminal */
.u-cursor {
  display: inline-block;
  width: 0.5em; height: 1em;
  background: var(--u-green);
  vertical-align: text-bottom;
  animation: u-blink-cursor 1s step-end infinite;
}

/* ═══════════════════════════════════════════════════════════════════════════
   14. CALLOUTS
   ═══════════════════════════════════════════════════════════════════════════ */
.u-callout {
  display: flex;
  gap: 0.875rem;
  padding: 1rem 1.25rem;
  border-radius: var(--u-radius-sm);
  margin: 1.25rem 0;
  font-size: 0.875rem;
  line-height: 1.65;
}

.u-callout__icon { font-size: 1rem; flex-shrink: 0; margin-top: 0.05rem; }

.u-callout__body { flex: 1; }

.u-callout__label {
  font-family: var(--u-mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.u-callout p { margin: 0; }

/* Variants */
.u-callout--beginner {
  background: rgba(34,211,238,0.05);
  border: 1px solid rgba(34,211,238,0.18);
}
.u-callout--beginner .u-callout__label { color: var(--u-accent); }
.u-callout--beginner p { color: #3a7080; }

.u-callout--opsec {
  background: rgba(248,113,113,0.05);
  border: 1px solid rgba(248,113,113,0.18);
}
.u-callout--opsec .u-callout__label { color: var(--u-red); }
.u-callout--opsec p { color: #8a5a5a; }

.u-callout--tip {
  background: rgba(34,211,238,0.05);
  border: 1px solid rgba(34,211,238,0.18);
}
.u-callout--tip .u-callout__label { color: var(--u-cyan); }
.u-callout--tip p { color: #4a7a8a; }

.u-callout--success {
  background: rgba(52,211,153,0.05);
  border: 1px solid rgba(52,211,153,0.18);
}
.u-callout--success .u-callout__label { color: var(--u-green); }
.u-callout--success p { color: #3a7060; }

.u-callout--debug {
  background: rgba(167,139,250,0.05);
  border: 1px solid rgba(167,139,250,0.18);
}
.u-callout--debug .u-callout__label { color: var(--u-violet); }
.u-callout--debug p { color: #6a5d8a; }

/* ═══════════════════════════════════════════════════════════════════════════
   15. BLOCKQUOTE CYPHERPUNK
   ═══════════════════════════════════════════════════════════════════════════ */
.u-blockquote-cypher {
  position: relative;
  margin: 2rem 0;
  padding: 1.5rem 1.75rem 1.5rem 2rem;
  border-left: 3px solid var(--u-accent);
  background: linear-gradient(135deg, rgba(34,211,238,0.04), rgba(34,211,238,0.02));
  border-radius: 0 var(--u-radius-sm) var(--u-radius-sm) 0;
}

.u-blockquote-cypher::before {
  content: '"';
  position: absolute;
  top: -0.5rem; left: 1rem;
  font-size: 4rem;
  line-height: 1;
  color: rgba(34,211,238,0.12);
  font-family: Georgia, serif;
}

.u-blockquote-cypher p {
  font-style: italic;
  font-size: 1rem;
  color: var(--u-text);
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

.u-blockquote-cypher cite {
  font-family: var(--u-mono);
  font-size: 0.7rem;
  color: var(--u-accent);
  font-style: normal;
}

/* ═══════════════════════════════════════════════════════════════════════════
   16. STEP LIST
   ═══════════════════════════════════════════════════════════════════════════ */
.u-step-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 1.25rem 0;
}

.u-step {
  display: flex;
  gap: 1rem;
  padding-bottom: 1.5rem;
  position: relative;
}

.u-step__connector {
  position: relative;
  flex-shrink: 0;
}

.u-step:not(:last-child) .u-step__connector::after {
  content: '';
  position: absolute;
  left: calc(50% - 0.5px);
  top: 2.25rem;
  width: 1px;
  height: calc(100% - 0.5rem);
  background: var(--u-border);
}

.u-step__num {
  width: 1.875rem; height: 1.875rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--u-mono);
  font-size: 0.7rem;
  font-weight: 700;
  background: var(--u-panel);
  border: 1px solid rgba(34,211,238,0.3);
  color: var(--u-accent);
  position: relative;
  z-index: 1;
}

.u-step__body { flex: 1; padding-top: 0.2rem; }
.u-step__title { font-size: 0.925rem; font-weight: 600; color: #fff; margin-bottom: 0.375rem; }
.u-step__desc  { font-size: 0.85rem; color: var(--u-muted); margin: 0; line-height: 1.6; }

/* ═══════════════════════════════════════════════════════════════════════════
   17. CHECKLIST
   ═══════════════════════════════════════════════════════════════════════════ */
.u-checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  margin: 1rem 0;
}

.u-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--u-muted);
  padding: 0.5rem 0.75rem;
  border-radius: var(--u-radius-sm);
  transition: background 0.15s;
}
.u-checklist li:hover { background: var(--u-panel); }

.u-checklist li input[type="checkbox"] {
  margin-top: 0.15rem;
  accent-color: var(--u-accent);
  flex-shrink: 0;
  cursor: pointer;
  width: 1rem; height: 1rem;
}

.u-checklist li label { cursor: pointer; line-height: 1.5; }

.u-checklist li.u-checked { color: var(--u-green); }
.u-checklist li.u-checked label { text-decoration: line-through; opacity: 0.65; }

/* ═══════════════════════════════════════════════════════════════════════════
   18. GLOSSARY
   ═══════════════════════════════════════════════════════════════════════════ */
.u-glossary {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.u-glossary__item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 0 1rem;
  padding: 0.625rem 0.875rem;
  border-radius: var(--u-radius-sm);
  background: var(--u-panel);
  border: 1px solid var(--u-border);
  font-size: 0.85rem;
  transition: border-color 0.15s;
}
.u-glossary__item:hover { border-color: rgba(34,211,238,0.15); }

.u-glossary__term {
  font-family: var(--u-mono);
  font-weight: 700;
  color: var(--u-accent);
  align-self: start;
  padding-top: 0.05rem;
}
.u-glossary__def { color: var(--u-muted); line-height: 1.6; }

/* ═══════════════════════════════════════════════════════════════════════════
   19. FAQ
   ═══════════════════════════════════════════════════════════════════════════ */
.u-faq__item { border-bottom: 1px solid var(--u-border); }

.u-faq__question {
  width: 100%;
  text-align: left;
  padding: 1rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--u-text);
  background: none;
  border: none;
  cursor: pointer;
  transition: color 0.2s;
  font-family: var(--u-sans);
}
.u-faq__question:hover { color: var(--u-accent); }

.u-faq__icon {
  flex-shrink: 0;
  font-family: var(--u-mono);
  font-size: 0.8rem;
  color: var(--u-muted);
  transition: transform 0.2s;
  width: 1rem;
  text-align: center;
}
.u-faq__question.is-open .u-faq__icon { transform: rotate(45deg); color: var(--u-accent); }

.u-faq__answer {
  padding: 0 0 1rem;
  font-size: 0.875rem;
  color: var(--u-muted);
  line-height: 1.75;
  display: none;
}
.u-faq__answer.is-open { display: block; }

/* ═══════════════════════════════════════════════════════════════════════════
   20. CONTENT GRID
   ═══════════════════════════════════════════════════════════════════════════ */
.u-content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.u-empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3rem;
  font-family: var(--u-mono);
  font-size: 0.8rem;
  color: var(--u-muted);
}

/* ═══════════════════════════════════════════════════════════════════════════
   21. MODE TOGGLE
   ═══════════════════════════════════════════════════════════════════════════ */
.u-mode-toggle {
  display: flex;
  background: var(--u-panel);
  border: 1px solid var(--u-border);
  border-radius: var(--u-radius-sm);
  overflow: hidden;
}

.u-mode-toggle button {
  padding: 0.3rem 0.75rem;
  font-family: var(--u-mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
  color: var(--u-muted);
  background: transparent;
  border: none;
  transition: var(--u-transition);
}
.u-mode-toggle button.is-active { background: var(--u-accent); color: #000; font-weight: 700; }

/* Expert content visibility */
.u-expert-only { display: none; }
body.is-expert .u-expert-only   { display: block; }
body.is-expert .u-beginner-only { display: none; }

/* ═══════════════════════════════════════════════════════════════════════════
   22. FILTER BAR
   ═══════════════════════════════════════════════════════════════════════════ */
.u-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.u-filter-btn {
  font-family: var(--u-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.3rem 0.75rem;
  border-radius: var(--u-radius-sm);
  border: 1px solid var(--u-border);
  background: var(--u-panel);
  color: var(--u-muted);
  cursor: pointer;
  transition: var(--u-transition);
}
.u-filter-btn:hover,
.u-filter-btn.is-active {
  border-color: rgba(34,211,238,0.4);
  color: var(--u-accent);
  background: rgba(34,211,238,0.05);
}

/* ═══════════════════════════════════════════════════════════════════════════
   23. FOOTER
   ═══════════════════════════════════════════════════════════════════════════ */
.u-footer {
  border-top: 1px solid var(--u-border);
  padding: 2rem 1.5rem;
  background: rgba(0,0,0,0.25);
}

.u-footer__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.625rem;
  text-align: center;
  font-family: var(--u-mono);
  font-size: 0.7rem;
  color: var(--u-muted);
}

.u-footer__links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.u-footer__links a { color: var(--u-muted); transition: color 0.2s; }
.u-footer__links a:hover { color: var(--u-accent); text-decoration: none; }

.u-footer__quote { opacity: 0.45; font-style: italic; }

/* ═══════════════════════════════════════════════════════════════════════════
   24. ANIMATIONS & UTILITAIRES
   ═══════════════════════════════════════════════════════════════════════════ */
@keyframes u-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.85); }
}

@keyframes u-blink-cursor {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

@keyframes u-fade-up {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.u-fade-up { animation: u-fade-up 0.35s ease-out forwards; }

/* Séparateur décoratif */
.u-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--u-border), transparent);
  margin: var(--u-space-lg) 0;
}

/* Texte sélectionnable mono */
.u-select-all { user-select: all; cursor: copy; }

/* ═══════════════════════════════════════════════════════════════════════════
   25. RESPONSIVE
   ═══════════════════════════════════════════════════════════════════════════ */
@media (min-width: 1024px) {
  .u-page-layout {
    grid-template-columns: 220px 1fr;
    gap: 0 2rem;
    align-items: start;
  }
  .u-sidebar { display: block; }
}

@media (max-width: 640px) {
  .u-hero__title { font-size: 1.75rem; }
  .u-glossary__item { grid-template-columns: 1fr; gap: 0.25rem; }
  .u-nav__links { display: none; }
}

@media (max-width: 480px) {
  .u-page-wrapper,
  .u-page-layout { padding: 0 1rem; }
}

/* ═══════════════════════════════════════════════════════════════════════════
   26. ILLUSTRATIONS SVG (.u-illu)
   ═══════════════════════════════════════════════════════════════════════════ */
.u-illu {
  margin: 1.75rem 0;
  border: 1px solid var(--u-border);
  border-radius: var(--u-radius);
  background: var(--u-surface);
  padding: 1.5rem 1.25rem 1rem;
  overflow: hidden;
}

.u-illu svg { width: 100%; height: auto; display: block; }

.u-illu figcaption {
  font-family: var(--u-mono);
  font-size: 0.67rem;
  color: var(--u-muted);
  text-align: center;
  margin-top: 0.75rem;
  letter-spacing: 0.04em;
  line-height: 1.5;
}

/* ═══════════════════════════════════════════════════════════════════════════
   27. PARCOURS DÉBUTANT (.u-journey)
   ═══════════════════════════════════════════════════════════════════════════ */
.u-journey {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 0;
  margin: 2rem 0;
  align-items: start;
}

.u-journey__step {
  padding: 1.5rem 1.125rem;
  border: 1px solid var(--u-border);
  border-radius: var(--u-radius);
  background: var(--u-panel);
  transition: border-color 0.2s, background 0.2s;
}

.u-journey__step:hover { border-color: rgba(34,211,238,0.22); background: var(--u-hover); }

.u-journey__arrow {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 2.125rem;
  font-family: var(--u-mono);
  font-size: 1rem;
  color: var(--u-border);
  user-select: none;
  width: 2.5rem;
}

.u-journey__num {
  font-family: var(--u-mono);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--u-accent);
  margin-bottom: 0.5rem;
}

.u-journey__icon {
  font-size: 1.875rem;
  margin-bottom: 0.625rem;
  display: block;
  line-height: 1;
}

.u-journey__title {
  font-size: 0.925rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.375rem;
  line-height: 1.25;
}

.u-journey__meta {
  font-family: var(--u-mono);
  font-size: 0.68rem;
  color: var(--u-muted);
  line-height: 1.5;
  margin-bottom: 0.625rem;
}

.u-journey__desc {
  font-size: 0.825rem;
  color: var(--u-muted);
  line-height: 1.65;
  margin-bottom: 0.875rem;
}

.u-journey__cta {
  display: inline-flex;
  align-items: center;
  font-family: var(--u-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--u-accent);
  text-decoration: none;
  transition: opacity 0.2s;
}
.u-journey__cta:hover { opacity: 0.75; text-decoration: none; }

@media (max-width: 700px) {
  .u-journey { grid-template-columns: 1fr; }
  .u-journey__arrow { display: none; }
  .u-journey__step { margin-bottom: 0.75rem; }
}

/* ═══════════════════════════════════════════════════════════════════════════
   28. EMAIL GATE (.u-gate)
   ═══════════════════════════════════════════════════════════════════════════ */

.u-gate-overlay {
  position: fixed; inset: 0; z-index: 200;
  display: flex; align-items: center; justify-content: center; padding: 1rem;
  backdrop-filter: blur(8px) brightness(0.45);
  -webkit-backdrop-filter: blur(8px) brightness(0.45);
  background: rgba(0,0,0,0.55);
  animation: u-fade-up 0.35s ease-out forwards;
}
.u-gate-overlay.u-gate--hidden {
  opacity: 0; pointer-events: none; transition: opacity 0.4s ease;
}
.u-gate-modal {
  background: rgba(10,10,10,0.96);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(34,211,238,0.2);
  border-radius: var(--u-radius-lg);
  box-shadow: 0 0 40px rgba(34,211,238,0.06), 0 24px 64px rgba(0,0,0,0.8);
  padding: 2.5rem 2rem; width: 100%; max-width: 420px;
  display: flex; flex-direction: column; gap: 1.25rem; position: relative;
}
.u-gate-modal::before {
  content: ''; position: absolute; top: 0; left: 2rem; right: 2rem; height: 1px;
  background: linear-gradient(90deg, transparent, var(--u-accent), transparent);
  opacity: 0.4;
}
.u-gate-icon { font-size: 2rem; text-align: center; }
.u-gate-title {
  font-size: 1.2rem; font-weight: 800; color: #fff;
  letter-spacing: -0.02em; text-align: center; line-height: 1.25;
}
.u-gate-title .u-gate-accent { color: var(--u-accent); }
.u-gate-sub {
  font-size: 0.85rem; color: var(--u-muted);
  text-align: center; line-height: 1.65; margin-top: -0.5rem;
}
.u-gate-form { display: flex; flex-direction: column; gap: 0.75rem; }
.u-gate-input {
  width: 100%; background: var(--u-surface);
  border: 1px solid var(--u-border); border-radius: var(--u-radius-sm);
  padding: 0.65rem 0.875rem;
  font-family: var(--u-mono); font-size: 0.85rem; color: var(--u-text);
  outline: none; transition: border-color 0.2s, box-shadow 0.2s;
}
.u-gate-input::placeholder { color: var(--u-muted); opacity: 0.7; }
.u-gate-input:focus {
  border-color: rgba(34,211,238,0.4);
  box-shadow: 0 0 0 3px rgba(34,211,238,0.08);
}
.u-gate-btn {
  width: 100%; padding: 0.75rem 1rem;
  background: rgba(34,211,238,0.12); border: 1px solid rgba(34,211,238,0.35);
  border-radius: var(--u-radius-sm); color: var(--u-accent);
  font-family: var(--u-mono); font-size: 0.72rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.1em;
  cursor: pointer; transition: var(--u-transition);
  display: flex; align-items: center; justify-content: center; gap: 0.5rem;
}
.u-gate-btn:hover:not(:disabled) {
  background: rgba(34,211,238,0.2); border-color: rgba(34,211,238,0.55);
  box-shadow: var(--u-glow);
}
.u-gate-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.u-gate-btn--loading::after {
  content: ''; width: 0.75rem; height: 0.75rem;
  border: 2px solid rgba(34,211,238,0.3); border-top-color: var(--u-accent);
  border-radius: 50%; animation: u-gate-spin 0.7s linear infinite;
}
.u-gate-error {
  font-family: var(--u-mono); font-size: 0.7rem; color: var(--u-red);
  text-align: center; display: none;
  padding: 0.5rem 0.75rem;
  background: rgba(248,113,113,0.07); border: 1px solid rgba(248,113,113,0.2);
  border-radius: var(--u-radius-sm);
}
.u-gate-error.is-visible { display: block; }
.u-gate-fine {
  font-family: var(--u-mono); font-size: 0.62rem;
  color: var(--u-muted); text-align: center; line-height: 1.6; opacity: 0.7;
}
@keyframes u-gate-spin { to { transform: rotate(360deg); } }
@media (max-width: 480px) { .u-gate-modal { padding: 2rem 1.25rem; } }

/* ═══════════════════════════════════════════════════════════════════════════
   29. TUTORIAL END CTA (.u-tutorial-cta)
   ═══════════════════════════════════════════════════════════════════════════ */

.u-tutorial-cta { margin-top: 3rem; }
.u-tutorial-cta__inner {
  background: rgba(34,211,238,0.03);
  border: 1px solid rgba(34,211,238,0.16);
  border-radius: var(--u-radius-lg);
  padding: 2.5rem 2rem;
  display: flex; flex-direction: column; align-items: center;
  gap: 1.25rem; text-align: center; position: relative; overflow: hidden;
}
.u-tutorial-cta__inner::before {
  content: ''; position: absolute; top: 0; left: 2rem; right: 2rem; height: 1px;
  background: linear-gradient(90deg, transparent, var(--u-accent), transparent);
  opacity: 0.3;
}
.u-tutorial-cta__icon { font-size: 1.75rem; }
.u-tutorial-cta__title {
  font-size: 1.2rem; font-weight: 800; color: #fff;
  letter-spacing: -0.02em; line-height: 1.25;
}
.u-tutorial-cta__sub {
  font-size: 0.875rem; color: var(--u-muted);
  line-height: 1.65; max-width: 480px;
}
.u-tutorial-cta__form {
  display: flex; gap: 0.625rem; width: 100%; max-width: 460px;
  flex-wrap: wrap; justify-content: center;
}
.u-tutorial-cta__input {
  flex: 1; min-width: 200px;
  background: var(--u-surface); border: 1px solid var(--u-border);
  border-radius: var(--u-radius-sm); padding: 0.65rem 0.875rem;
  font-family: var(--u-mono); font-size: 0.85rem; color: var(--u-text);
  outline: none; transition: border-color 0.2s, box-shadow 0.2s;
}
.u-tutorial-cta__input::placeholder { color: var(--u-muted); opacity: 0.7; }
.u-tutorial-cta__input:focus {
  border-color: rgba(34,211,238,0.4);
  box-shadow: 0 0 0 3px rgba(34,211,238,0.08);
}
.u-tutorial-cta__btn {
  padding: 0.65rem 1.25rem; white-space: nowrap;
  background: rgba(34,211,238,0.1); border: 1px solid rgba(34,211,238,0.3);
  border-radius: var(--u-radius-sm); color: var(--u-accent);
  font-family: var(--u-mono); font-size: 0.72rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.1em;
  cursor: pointer; transition: var(--u-transition);
}
.u-tutorial-cta__btn:hover:not(:disabled) {
  background: rgba(34,211,238,0.2); border-color: rgba(34,211,238,0.5);
  box-shadow: var(--u-glow);
}
.u-tutorial-cta__btn:disabled { opacity: 0.5; cursor: not-allowed; }
.u-tutorial-cta__success {
  font-family: var(--u-mono); font-size: 0.875rem;
  color: var(--u-green); font-weight: 600;
}
.u-tutorial-cta__fine {
  font-family: var(--u-mono); font-size: 0.62rem;
  color: var(--u-muted); opacity: 0.7;
}
@media (max-width: 480px) { .u-tutorial-cta__inner { padding: 2rem 1.25rem; } }

/* ═══════════════════════════════════════════════════════════════════════════
   30. LANG TOGGLE (.u-lang-btn + data-lang visibility)
   ═══════════════════════════════════════════════════════════════════════════ */

[data-lang="en"] { display: none; }
body.is-lang-en [data-lang="fr"] { display: none; }
body.is-lang-en [data-lang="en"] { display: revert; }

.u-lang-btn {
  font-family: var(--u-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--u-muted);
  background: transparent;
  border: 1px solid var(--u-border);
  border-radius: var(--u-radius-sm);
  padding: 0.25rem 0.6rem;
  cursor: pointer;
  transition: var(--u-transition);
  line-height: 1;
}
.u-lang-btn:hover {
  color: var(--u-accent);
  border-color: rgba(34,211,238,0.4);
}

/* ═══════════════════════════════════════════════════════════════════════════
   30. SANDBOX TOGGLE (.u-sandbox-toggle)
   ═══════════════════════════════════════════════════════════════════════════ */
.u-sandbox-toggle {
  background: rgba(167,139,250,0.04);
  border: 1px solid rgba(167,139,250,0.18);
  border-radius: var(--u-radius);
  margin: 1.25rem 0;
  overflow: hidden;
}
.u-sandbox-toggle summary {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.875rem 1rem;
  cursor: pointer;
  font-family: var(--u-mono);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--u-violet);
  list-style: none;
  user-select: none;
  transition: background 0.2s;
}
.u-sandbox-toggle summary::-webkit-details-marker { display: none; }
.u-sandbox-toggle summary:hover { background: rgba(167,139,250,0.06); }
.u-sandbox-toggle summary::after {
  content: '▸';
  margin-left: auto;
  font-size: 0.65rem;
  transition: transform 0.2s;
  color: var(--u-muted);
}
.u-sandbox-toggle[open] summary::after { transform: rotate(90deg); }
.u-sandbox-toggle__body {
  padding: 0 1rem 1rem;
  border-top: 1px solid rgba(167,139,250,0.1);
}
.u-sandbox-toggle__body p {
  font-size: 0.875rem;
  color: var(--u-muted);
  line-height: 1.7;
  margin: 0.75rem 0;
}

/* ═══════════════════════════════════════════════════════════════════════════
   31. COMPLETION BADGE (.u-completion-badge)
   ═══════════════════════════════════════════════════════════════════════════ */
.u-completion-badge {
  margin-top: 1.5rem;
  padding: 1.5rem;
  background: rgba(52,211,153,0.04);
  border: 1px solid rgba(52,211,153,0.25);
  border-radius: var(--u-radius);
  text-align: center;
  animation: u-fade-up 0.4s ease-out forwards;
}
.u-completion-badge__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--u-green);
  margin: 0 0 0.25rem;
}
.u-completion-badge__sub {
  font-size: 0.78rem;
  color: var(--u-muted);
  margin: 0 0 1rem;
  font-family: var(--u-mono);
}
.u-download-badge-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.6rem 1.25rem;
  background: rgba(52,211,153,0.1);
  border: 1px solid rgba(52,211,153,0.35);
  border-radius: var(--u-radius-sm);
  color: var(--u-green);
  font-family: var(--u-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: var(--u-transition);
}
.u-download-badge-btn:hover {
  background: rgba(52,211,153,0.18);
  border-color: rgba(52,211,153,0.55);
  box-shadow: 0 0 12px rgba(52,211,153,0.15);
}