/* ========== nanoMAT v2 — surcouche design ========== */

:root {
  /* Couleurs principales */
  --nm-bg: #f4f6fb;
  --nm-surface: #ffffff;
  --nm-primary: #005b96;
  --nm-primary-soft: #e3f2fd;
  --nm-primary-dark: #003b62;
  --nm-accent: #ff8a3d;

  /* Texte */
  --nm-text: #1f2933;
  --nm-muted: #6b7280;

  /* Bordures & ombres */
  --nm-border: #e5e7eb;
  --nm-radius-lg: 1rem;
  --nm-radius-md: 0.75rem;
  --nm-radius-sm: 0.5rem;
  --nm-shadow-soft: 0 12px 30px rgba(15, 23, 42, 0.08);
}

/* ========== Global ========== */

body {
  background-color: var(--nm-bg);
  color: var(--nm-text);
}

/* Sections (ancre plus douce) */
main,
section {
  scroll-margin-top: 80px;
}

/* ========== Navbar ========== */

.navbar {
  background-color: #ffffff !important;
  border-bottom: 1px solid var(--nm-border);
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.03);
}

.navbar-brand {
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.95rem;
}

.navbar-nav .nav-link {
  font-weight: 500;
  color: var(--nm-muted);
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link:focus {
  color: var(--nm-primary);
}

/* Switch de langue */
.navbar .btn-sm {
  border-radius: 999px;
}

/* ========== Hero ========== */

#hero {
  position: relative;
}

#hero .hero-content h1 {
  font-size: clamp(2.5rem, 4vw, 3.5rem);
}

#hero .hero-content p.lead {
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

/* Boutons du hero (multi-boutons inclus) */
#hero .btn-lg {
  padding-inline: 2.2rem;
  border-radius: 999px;
  font-weight: 500;
}

/* ========== Boutons ========== */

.btn-primary {
  background-color: var(--nm-primary);
  border-color: var(--nm-primary);
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--nm-primary-dark);
  border-color: var(--nm-primary-dark);
}

.btn-outline-primary {
  color: var(--nm-primary);
  border-color: var(--nm-primary);
}

.btn-outline-primary:hover,
.btn-outline-primary:focus {
  background-color: var(--nm-primary);
  color: #ffffff;
}

/* Accent optionnel */
.btn-accent {
  background-color: var(--nm-accent);
  border-color: var(--nm-accent);
  color: #ffffff;
}

.btn-accent:hover,
.btn-accent:focus {
  filter: brightness(0.95);
}

/* ========== Sections ========== */

#congress {
  background: radial-gradient(circle at top left, #ffffff 0, #ffffff 55%, #eef2ff 100%);
}

#congress h2,
#news h2 {
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* ========== Cards (news, etc.) ========== */

.card {
  border: none;
  border-radius: var(--nm-radius-lg);
  box-shadow: var(--nm-shadow-soft);
}

.card-img-top {
  border-top-left-radius: var(--nm-radius-lg);
  border-top-right-radius: var(--nm-radius-lg);
}

.card-body {
  padding: 1.25rem 1.25rem 1.5rem;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card-text.small {
  color: var(--nm-muted);
}

/* ========== Footer ========== */

footer {
  border-top: 1px solid var(--nm-border);
}

footer p {
  margin-bottom: 0.25rem;
}