/*
 * _static/css/courses.css
 * ════════════════════════════════════════════════════════════════════════
 * 1. Grille de cartes — page d'accueil  (.course-grid / .course-card)
 * 2. Onglets sidebar  (.course-tabs / .course-tab)
 * 3. Arbre local      (.course-toctree)
 *
 * Deux cours, deux couleurs :
 *   Transfert Radiatif → bleu-violet  (physique théorique)
 *   Verilog / FPGA     → orange-ambre (électronique numérique)
 *
 * Compatible furo clair et sombre via [data-theme="dark"].
 * ════════════════════════════════════════════════════════════════════════
 */


/* ── Tokens de couleur ───────────────────────────────────────────────── */

:root {
  --rt-hue:           248;          /* bleu-violet */
  --rt-accent:        hsl(var(--rt-hue), 62%, 48%);
  --rt-accent-dark:   hsl(var(--rt-hue), 62%, 36%);
  --rt-bg:            hsl(var(--rt-hue), 55%, 96%);

  --fpga-hue:         32;           /* orange-ambre */
  --fpga-accent:      hsl(var(--fpga-hue), 90%, 40%);
  --fpga-accent-dark: hsl(var(--fpga-hue), 90%, 28%);
  --fpga-bg:          hsl(var(--fpga-hue), 90%, 95%);
}

[data-theme="dark"] {
  --rt-accent:        hsl(var(--rt-hue), 70%, 68%);
  --rt-accent-dark:   hsl(var(--rt-hue), 70%, 80%);
  --rt-bg:            hsl(var(--rt-hue), 25%, 16%);

  --fpga-accent:      hsl(var(--fpga-hue), 85%, 60%);
  --fpga-accent-dark: hsl(var(--fpga-hue), 85%, 75%);
  --fpga-bg:          hsl(var(--fpga-hue), 30%, 15%);
}


/* ════════════════════════════════════════════════════════════════════════
   1. Grille de cartes — page d'accueil
   ════════════════════════════════════════════════════════════════════════ */

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2.5rem 0 3rem;
}

.course-card {
  display: flex;
  flex-direction: column;
  border-radius: 10px;
  border: 1px solid var(--color-background-border);
  overflow: hidden;
  text-decoration: none !important;
  color: inherit;
  background: var(--color-background-primary);
  transition: box-shadow .2s ease, transform .15s ease;
}

.course-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(0, 0, 0, .12);
  text-decoration: none !important;
}

/* Bandeau coloré en haut de la carte */
.course-card__header {
  padding: .65rem 1.1rem;
  display: flex;
  align-items: center;
}

.course-card__header--rt {
  background: var(--rt-accent);
}

.course-card__header--fpga {
  background: var(--fpga-accent);
}

.course-card__badge {
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: #fff;
  background: rgba(0,0,0,.18);
  padding: 2px 9px;
  border-radius: 99px;
}

/* Corps de la carte */
.course-card__body {
  padding: 1.2rem 1.3rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: .55rem;
  flex: 1;
}

.course-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0;
  color: var(--color-foreground-primary);
  /* reset Sphinx h2 margins */
  border: none;
  padding: 0;
}

.course-card__desc {
  font-size: .9rem;
  color: var(--color-foreground-secondary);
  line-height: 1.6;
  margin: 0;
}

.course-card__topics {
  list-style: none;
  padding: 0;
  margin: .2rem 0 0;
  display: flex;
  flex-direction: column;
  gap: .25rem;
}

.course-card__topics li {
  font-size: .82rem;
  color: var(--color-foreground-muted);
  padding-left: 1rem;
  position: relative;
}

.course-card__topics li::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--color-foreground-border);
}

.course-card:hover .course-card--rt .course-card__topics li::before,
.course-card__header--rt ~ .course-card__body .course-card__topics li::before {
  color: var(--rt-accent);
}

.course-card__header--fpga ~ .course-card__body .course-card__topics li::before {
  color: var(--fpga-accent);
}

.course-card__cta {
  margin-top: auto;
  padding-top: .7rem;
  font-size: .85rem;
  font-weight: 600;
}

.course-card__header--rt ~ .course-card__body .course-card__cta {
  color: var(--rt-accent);
}

.course-card__header--fpga ~ .course-card__body .course-card__cta {
  color: var(--fpga-accent);
}


/* ════════════════════════════════════════════════════════════════════════
   2. Onglets sidebar  (.course-tabs / .course-tab)
   ════════════════════════════════════════════════════════════════════════ */

.course-tabs {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin: .75rem 0 .5rem;
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--color-background-border);
}

.course-tab {
  display: block;
  padding: 5px 10px 5px 11px;
  border-radius: 5px;
  border-left: 3px solid transparent;
  font-size: var(--font-size--small, .8rem);
  font-weight: 500;
  text-decoration: none !important;
  color: var(--color-foreground-secondary);
  transition: background .15s, border-color .15s, color .15s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.course-tab:hover {
  background: var(--color-background-hover);
  color: var(--color-foreground-primary);
  text-decoration: none !important;
}

/* Onglet Transfert Radiatif */
.course-tab--transfert-radiatif:hover {
  border-left-color: var(--rt-accent);
}

.course-tab--transfert-radiatif.course-tab--active {
  border-left-color: var(--rt-accent);
  background: var(--rt-bg);
  color: var(--rt-accent-dark);
  font-weight: 600;
}

/* Onglet Verilog / FPGA */
.course-tab--verilog-fpga:hover {
  border-left-color: var(--fpga-accent);
}

.course-tab--verilog-fpga.course-tab--active {
  border-left-color: var(--fpga-accent);
  background: var(--fpga-bg);
  color: var(--fpga-accent-dark);
  font-weight: 600;
}


/* ════════════════════════════════════════════════════════════════════════
   3. Arbre local  (.course-toctree)
   ════════════════════════════════════════════════════════════════════════ */

.course-toctree {
  margin-top: .4rem;
}

.course-toctree .toc-tree {
  font-size: var(--font-size--small, .8rem);
}

/* Lien survolé : couleur d'accent du cours */
.course-toctree[data-course="transfert_radiatif"] a:hover {
  color: var(--rt-accent);
}

.course-toctree[data-course="verilog_fpga"] a:hover {
  color: var(--fpga-accent);
}

/* Page courante dans l'arbre */
.course-toctree[data-course="transfert_radiatif"] .current > a {
  color: var(--rt-accent-dark) !important;
  font-weight: 600;
}

.course-toctree[data-course="verilog_fpga"] .current > a {
  color: var(--fpga-accent-dark) !important;
  font-weight: 600;
}


/* ════════════════════════════════════════════════════════════════════════
   4. Responsive
   ════════════════════════════════════════════════════════════════════════ */

@media (max-width: 500px) {
  .course-grid {
    grid-template-columns: 1fr;
  }
}