/* Virgule — visual system V2
   Preserve the brand, rebuild the interface around learning.
   DNA kept: logo, ardoise/photo, craie, gold, blueprint.
   No gradients, no decorative shadows. */
:root {
  --vgl-content-max: 1180px;
  --vgl-reading-max: 760px;
  --vgl-gutter: clamp(16px, 3vw, 40px);
  --vgl-line-soft: rgba(232,245,232,.10);
  --vgl-line: rgba(232,245,232,.15);
  --vgl-surface: rgba(12,32,16,.88);
  --vgl-surface-strong: rgba(19,40,19,.96);
}

html { background: var(--ardoise); }
body {
  background: var(--ardoise);
  color: var(--craie);
  font-family: var(--font-body);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--craie-doree-dim); color: var(--craie); }

/* The existing logo is authoritative. Never replace it with a text imitation. */
.vgl-signe,
.vgl-lockup .vgl-signe {
  background-color: currentColor;
  -webkit-mask: url('/assets/logo/virgule-mono.svg') no-repeat center / contain;
  mask: url('/assets/logo/virgule-mono.svg') no-repeat center / contain;
}
.vgl-lockup .vgl-signe { margin-inline-start: .12em; }
[dir="rtl"] .vgl-signe,
[lang="ar"] .vgl-signe { transform: rotate(180deg); }

/* Shared reading/container rhythm. */
.acc-shell,
.bibliotheque-shell,
.parcours-shell,
.fiche-shell,
.examen-shell,
.examens-shell {
  width: min(100% - 2 * var(--vgl-gutter), var(--vgl-content-max));
  margin-inline: auto;
}
.vgl-page {
  width: min(100%, var(--vgl-content-max));
  margin-inline: auto;
  padding: 32px var(--vgl-gutter) 56px;
}
.vgl-page-header { margin-bottom: 28px; }
.vgl-page-kicker {
  display: block;
  margin-bottom: 8px;
  color: var(--craie-doree);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.vgl-page-title {
  color: var(--craie);
  font-family: var(--font-head);
  font-size: clamp(30px, 5vw, 48px);
  line-height: 1.08;
  letter-spacing: -.025em;
}
.vgl-page-subtitle {
  max-width: 680px;
  margin-top: 10px;
  color: var(--craie-pale-vive);
  line-height: 1.65;
}

/* Surfaces are pieces of the ardoise, not generic SaaS cards. */
.vgl-card,
.acc-surface,
.biblio-card,
.fiche-card,
.exam-card,
.examen-card,
.parcours-card,
.quiz-card,
.exercise-card {
  background: var(--vgl-surface);
  border: 1px solid var(--vgl-line);
  border-radius: var(--radius-lg);
  box-shadow: none;
}
.vgl-card-hover:hover,
.acc-surface:hover,
.biblio-card:hover,
.fiche-card:hover,
.exam-card:hover,
.examen-card:hover,
.parcours-card:hover {
  border-color: var(--craie-doree-border);
}

/* One action grammar. Gold means the next useful action. */
.vgl-btn,
.vgl-btn-primary,
.vgl-btn-outline,
.vgl-btn-secondary {
  min-height: 44px;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
}
.vgl-btn-primary { background: var(--craie-doree); color: var(--ardoise); }
.vgl-btn-primary:hover { filter: brightness(1.06); }
.vgl-btn-outline { background: transparent; color: var(--craie); border-color: var(--vgl-line); }
.vgl-btn-outline:hover { border-color: var(--craie-doree); color: var(--craie-doree); }

/* Learning surfaces: one beat, one visual center, one next step. */
.vgl-lesson {
  width: min(100%, var(--vgl-reading-max));
  margin-inline: auto;
  padding: 28px 20px 88px;
}
.vgl-lesson-step {
  padding: 30px 0;
  border-bottom: 1px solid var(--vgl-line-soft);
}
.vgl-lesson-step:last-child { border-bottom: 0; }
.vgl-lesson-step > h2 {
  color: var(--craie);
  font-family: var(--font-head);
  font-size: clamp(23px, 4vw, 34px);
  line-height: 1.15;
}
.vgl-lesson-step > p {
  max-width: 68ch;
  margin-top: 12px;
  color: var(--craie-pale-vive);
  line-height: 1.75;
}
.vgl-progress { height: 6px; background: rgba(232,245,232,.08); }
.vgl-progress-bar { background: var(--craie-doree); }

/* Controls: touch first, no hover-only information. */
button, a, input, textarea, select { touch-action: manipulation; }
:focus-visible { outline: 2px solid var(--craie-doree); outline-offset: 3px; }
input, textarea, select {
  color: var(--craie);
  background: var(--ardoise-3);
  border-color: var(--vgl-line);
  border-radius: var(--radius-sm);
}

/* Desktop shell; mobile keeps the existing bottom-nav contract. */
.vgl-sidebar {
  width: var(--sidebar-width, 240px);
  background: var(--ardoise-2);
  border-inline-end: 1px solid var(--vgl-line);
  box-shadow: none;
}
.vgl-sidebar-link { min-height: 44px; border-radius: 12px; }
.vgl-sidebar-link.active {
  background: var(--craie-doree-dim);
  border-color: var(--craie-doree-border);
  color: var(--craie-doree);
}
.vgl-bottom-nav {
  background: rgba(12,32,16,.96);
  border-top-color: var(--vgl-line);
  box-shadow: none;
}

/* Hero rule: the real slate photograph belongs to threshold/arrival moments.
   It is already the canonical landing hero; working lessons stay quieter. */
.page-hero,
.exam-hero,
header.pageTop,
.topSticky {
  background-image: url('/assets/hero/hero-fond.webp');
}
@media (max-width: 767px) {
  .page-hero,
  .exam-hero,
  header.pageTop,
  .topSticky { background-image: url('/assets/hero/hero-fond-m.webp'); }
}

/* Never allow the system layer to create a second decorative background. */
body::before { display: none !important; }

@media (max-width: 1023.98px) {
  .vgl-page { padding: 24px 16px 48px; }
  .vgl-lesson { padding-inline: 16px; }
}
@media (max-width: 480px) {
  .vgl-page-title { font-size: 30px; }
  .vgl-btn, .vgl-btn-primary, .vgl-btn-outline, .vgl-btn-secondary { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
}