/* =====================================================
   HEADER RESPONSIVE - SIFO ENERGIE
   Fichier dédié : logo, navigation, menu hamburger mobile
   À inclure APRÈS le CSS global (variables --color-* etc.)
   ===================================================== */

/* ---------- Header container ---------- */
header {
    background: var(--color-bg-white, #fff);
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.06);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0.6rem 5%;
    position: relative;
}

/* ---------- Logo ---------- */
.logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.logo a {
    display: flex;
    align-items: center;
    line-height: 0;
}

.logo-image {
    height: 72px;
    width: auto;
    max-width: 130px;
    object-fit: contain;
    transition: transform 0.25s ease;
}

.logo a:hover .logo-image {
    transform: scale(1.04);
}

/* ---------- Navigation (desktop) ---------- */
nav#nav-menu {
    display: flex;
    gap: 1.85rem;
    align-items: center;
}

nav#nav-menu a {
    text-decoration: none;
    color: var(--color-text-primary, #1e293b);
    font-weight: 500;
    font-size: 0.95rem;
    white-space: nowrap;
    padding: 0.4rem 0.1rem;
    position: relative;
    transition: color 0.25s ease;
}

nav#nav-menu a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 2px;
    background: var(--color-primary, #ff0000);
    border-radius: 2px;
    transition: width 0.3s ease;
}

nav#nav-menu a:hover {
    color: var(--color-primary, #ff0000);
}

nav#nav-menu a:hover::after {
    width: 100%;
}

nav#nav-menu a.active {
    color: var(--color-primary, #ff0000);
    font-weight: 600;
}

nav#nav-menu a.active::after {
    width: 100%;
}

/* ---------- Hamburger button ---------- */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1100;
    position: relative;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 3px;
    background: var(--color-text-primary, #1e293b);
    border-radius: 4px;
    transition: transform 0.3s ease, opacity 0.2s ease, background 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: translateY(8.5px) rotate(45deg);
    background: var(--color-primary, #ff0000);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: translateY(-8.5px) rotate(-45deg);
    background: var(--color-primary, #ff0000);
}

/* Empêche le scroll du body quand le menu mobile est ouvert */
body.nav-open {
    overflow: hidden;
}

/* Overlay sombre derrière le panneau mobile */
.nav-overlay {
    display: none;
}

/* =====================================================
   RESPONSIVE - Tablette / Mobile (<= 968px)
   ===================================================== */
@media (max-width: 968px) {
    .header-content {
        padding: 0.5rem 5%;
    }

    .logo-image {
        height: 56px;
    }

    .hamburger {
        display: flex;
    }

    /* Panneau de navigation coulissant */
    nav#nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 78%;
        max-width: 320px;
        height: 100vh;
        margin: 0;
        background: var(--color-bg-white, #fff);
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: 0;
        padding: 6.5rem 2rem 2rem;
        box-shadow: -8px 0 30px rgba(0, 0, 0, 0.18);
        transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
    }

    nav#nav-menu.active {
        right: 0;
    }

    nav#nav-menu a {
        width: 100%;
        padding: 1rem 0;
        font-size: 1.05rem;
        border-bottom: 1px solid rgba(0, 0, 0, 0.07);
    }

    nav#nav-menu a::after {
        display: none;
    }

    nav#nav-menu a.active {
        color: var(--color-primary, #ff0000);
        padding-left: 0.75rem;
        border-left: 3px solid var(--color-primary, #ff0000);
    }

    /* Overlay sombre cliquable, affiché uniquement quand le menu est ouvert */
    nav#nav-menu::before {
        content: '';
        position: fixed;
        inset: 0;
        width: 100vw;
        height: 100vh;
        background: rgba(15, 23, 42, 0.5);
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.35s ease;
        z-index: -1;
    }

    nav#nav-menu.active::before {
        opacity: 1;
        pointer-events: auto;
    }
}

/* =====================================================
   RESPONSIVE - Petit mobile (<= 480px)
   ===================================================== */
@media (max-width: 480px) {
    .logo-image {
        height: 46px;
        max-width: 100px;
    }

    nav#nav-menu {
        width: 88%;
        max-width: none;
        padding: 5.5rem 1.5rem 2rem;
    }
}