/* =========== EN-TÊTE ET NAVIGATION (Style adapté au thème) =========== */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 5%;
    background: rgba(18, 18, 18, 0.5);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(212, 175, 55, 0.2);
}
.logo { display: flex; align-items: center; }
.logo img { width: 50px; margin-right: 15px; filter: drop-shadow(0 0 5px rgba(212, 175, 55, 0.5)); }
.logo-text { font-size: 24px; font-weight: 700; letter-spacing: 2px; }
nav ul { list-style: none; display: flex; gap: 15px; }
nav a { 
    color: var(--color-light); 
    text-decoration: none; 
    font-weight: 500; 
    padding: 8px 15px; 
    border-radius: 5px; 
    transition: all 0.3s ease;
    position: relative;
}
nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background-color: var(--color-gold);
    transition: width 0.3s ease;
}
nav a:hover::after, nav a.active::after {
    width: 80%;
}
nav a.active { color: var(--color-gold); }

#lang-switch {
    background: transparent;
    border: 1px solid var(--color-gold);
    color: var(--color-gold);
    padding: 8px 16px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    font-family: var(--font-main);
    transition: all 0.3s ease;
}