/* ===========================================================
   Styles partagés — RetraiteOptimisée
   Palette moderne fintech
   =========================================================== */

:root {
  /* Couleurs de marque */
  --bg: #FAFAF7;           /* fond crème chaud */
  --surface: #FFFFFF;
  --surface-2: #F5F5F1;
  --primary: #0A2540;       /* deep navy (Stripe-like) */
  --primary-2: #1A365D;
  --accent: #00D4AA;        /* teal vibrant */
  --accent-2: #00BFA0;
  --accent-soft: #E6FAF5;
  --indigo: #635BFF;        /* gradient secondaire */
  --warn: #F59E0B;
  --danger: #DC2626;
  --text: #0A2540;
  --text-muted: #5A6B7A;
  --text-soft: #8896A6;
  --border: #E8E8E3;
  --border-strong: #D4D4CE;

  /* Ombres modernes */
  --shadow-xs: 0 1px 2px rgba(10, 37, 64, 0.04);
  --shadow-sm: 0 2px 8px rgba(10, 37, 64, 0.06);
  --shadow-md: 0 8px 24px rgba(10, 37, 64, 0.08);
  --shadow-lg: 0 20px 48px rgba(10, 37, 64, 0.12);
  --shadow-glow: 0 8px 32px rgba(0, 212, 170, 0.25);

  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;

  /* Gradient hero */
  --gradient-primary: linear-gradient(135deg, #0A2540 0%, #1A365D 50%, #243E63 100%);
  --gradient-accent: linear-gradient(135deg, #00D4AA 0%, #00BFA0 100%);
  --gradient-mesh: radial-gradient(at 20% 10%, rgba(99, 91, 255, 0.25) 0px, transparent 50%),
                   radial-gradient(at 80% 20%, rgba(0, 212, 170, 0.25) 0px, transparent 50%),
                   radial-gradient(at 50% 90%, rgba(255, 255, 255, 0.08) 0px, transparent 50%);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'cv11', 'ss01';
}

a { color: var(--primary); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--accent-2); }

h1, h2, h3, h4 {
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--text);
}

/* ============ NAVIGATION ============ */
.nav {
  background: rgba(250, 250, 247, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 16px 32px;
  position: sticky;
  top: 0;
  z-index: 50;
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.nav-brand {
  font-weight: 800;
  font-size: 18px;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.nav-brand span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
}
.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
}
.nav-links a:hover { color: var(--primary); }
.nav-links .nav-cta {
  background: var(--primary);
  color: white;
  padding: 9px 18px;
  border-radius: 8px;
  font-weight: 600;
}
.nav-links .nav-cta:hover {
  background: #061a2d;
  color: white;
  text-decoration: none;
}

/* ============ BOUTONS ============ */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition: all 0.2s cubic-bezier(.4,0,.2,1);
  font-family: inherit;
  letter-spacing: -0.01em;
  line-height: 1.4;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background: #061a2d;
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-accent {
  background: var(--gradient-accent);
  color: var(--primary);
  font-weight: 700;
  box-shadow: var(--shadow-glow);
}
.btn-accent:hover {
  color: var(--primary);
  box-shadow: 0 12px 36px rgba(0, 212, 170, 0.35);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--border-strong);
}
.btn-outline:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.btn-ghost {
  background: transparent;
  color: white;
  border: 1.5px solid rgba(255,255,255,0.3);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.1);
  color: white;
  border-color: white;
}

.btn-lg { padding: 16px 32px; font-size: 16px; border-radius: 12px; }
.btn-full { width: 100%; }

/* ============ CARTES ============ */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

/* ============ FORMULAIRES ============ */
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.form-group input {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--border-strong);
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
  background: var(--surface);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.form-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(0, 212, 170, 0.12);
}
.form-hint {
  font-size: 12px;
  color: var(--text-soft);
  margin-top: 6px;
}
.form-error {
  background: #FEF2F2;
  color: var(--danger);
  padding: 12px 14px;
  border-radius: 10px;
  font-size: 13px;
  margin-bottom: 14px;
  border: 1px solid #FCA5A5;
}

/* ============ FOOTER ============ */
.footer {
  background: var(--primary);
  color: #B8C5D1;
  padding: 56px 32px 28px;
  margin-top: 80px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}
.footer h4 {
  color: white;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 16px;
  font-weight: 700;
}
.footer a {
  display: block;
  color: #B8C5D1;
  font-size: 14px;
  padding: 5px 0;
  text-decoration: none;
  transition: color 0.15s;
}
.footer a:hover { color: var(--accent); }
.footer-brand p {
  font-size: 13px;
  color: #8896A6;
  margin: 8px 0 0;
  line-height: 1.6;
}
.footer-bottom {
  max-width: 1200px;
  margin: 40px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 12px;
  color: #8896A6;
  text-align: center;
}

/* ============ CONTENEURS ============ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}
.container-sm {
  max-width: 480px;
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 96px 0; }
.section-tight { padding: 48px 0; }

/* ============ RESPONSIVE ============ */
@media (max-width: 768px) {
  .nav { padding: 14px 16px; }
  .nav-links { gap: 16px; font-size: 13px; }
  .container { padding: 0 20px; }
  .section { padding: 56px 0; }
  .footer { padding: 40px 20px 24px; }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 480px) {
  .nav-links { gap: 12px; }
  .nav-links .nav-cta { padding: 7px 14px; }
  .nav-brand { font-size: 17px; }
  .footer-inner { grid-template-columns: 1fr; }
}

/* Mobile : garder seulement Connexion/Mon compte et le bouton principal dans la barre du haut */
@media (max-width: 640px) {
  .nav-links a:not(.nav-cta):not([href="login.html"]):not([href="account.html"]):not([href="app.html"]):not(#logout-link) { display: none; }
  .nav-links span#nav-user { display: none; }
}

/* .section écrasait les marges latérales de .container quand les deux classes sont sur le même élément */
.container.section { padding-left: 32px; padding-right: 32px; }
@media (max-width: 768px) { .container.section { padding-left: 20px; padding-right: 20px; } }