/* =============================================================
   Header global du site (top-bar + nav inter-apps + user actions)
   Light theme par défaut · variante .site-header--dark pour OC.
   ============================================================= */

.site-header {
    position: sticky;
    top: 0;
    z-index: 300;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem 0.6rem;
    padding: 0.5rem clamp(0.5rem, 2.5vw, 1.4rem);
    box-sizing: border-box;

    /* Variables de thème — light par défaut */
    --sh-bg:           rgba(248, 249, 250, 0.78);
    --sh-border:       rgba(9, 132, 227, 0.15);
    --sh-shadow:       0 2px 12px rgba(0, 0, 0, 0.06);
    --sh-text:         #455a64;
    --sh-text-strong:  #1a1a1a;
    --sh-text-muted:   #78909c;
    --sh-link-bg:      rgba(255, 255, 255, 0.6);
    --sh-link-border:  rgba(9, 132, 227, 0.18);
    --sh-link-hover:   rgba(9, 132, 227, 0.12);
    --sh-link-hovbd:   rgba(9, 132, 227, 0.35);
    --sh-link-hovtx:   #0d47a1;
    --sh-accent:       #1565c0;
    --sh-accent-fg:    #fff;
    --sh-accent-glow:  rgba(9, 132, 227, 0.25);
    --sh-danger:       #b00020;

    background: var(--sh-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--sh-border);
    box-shadow: var(--sh-shadow);
}

/* Variante sombre (OC) */
.site-header--dark {
    --sh-bg:           rgba(15, 23, 42, 0.92);
    --sh-border:       rgba(248, 113, 113, 0.22);
    --sh-shadow:       0 2px 16px rgba(0, 0, 0, 0.35);
    --sh-text:         #cbd5e1;
    --sh-text-strong:  #fde68a;
    --sh-text-muted:   #94a3b8;
    --sh-link-bg:      rgba(255, 255, 255, 0.04);
    --sh-link-border:  rgba(248, 113, 113, 0.28);
    --sh-link-hover:   rgba(251, 191, 36, 0.12);
    --sh-link-hovbd:   rgba(251, 191, 36, 0.45);
    --sh-link-hovtx:   #fde68a;
    --sh-accent:       linear-gradient(135deg, #f59e0b, #ef4444);
    --sh-accent-fg:    #0f172a;
    --sh-accent-glow:  rgba(239, 68, 68, 0.30);
    --sh-danger:       #f87171;
}

/* Auto-dark sur les pages light qui le souhaitent via media query */
@media (prefers-color-scheme: dark) {
    .site-header:not(.site-header--dark):not(.site-header--force-light) {
        --sh-bg:          rgba(30, 30, 46, 0.82);
        --sh-border:      rgba(116, 185, 255, 0.12);
        --sh-shadow:      0 2px 12px rgba(0, 0, 0, 0.3);
        --sh-text:        #cfd8dc;
        --sh-text-strong: #fff;
        --sh-text-muted:  #90a4ae;
        --sh-link-bg:     rgba(255, 255, 255, 0.05);
        --sh-link-border: rgba(116, 185, 255, 0.18);
        --sh-link-hover:  rgba(116, 185, 255, 0.14);
        --sh-link-hovbd:  rgba(116, 185, 255, 0.4);
        --sh-link-hovtx:  #e3f2fd;
    }
}

/* ---------- Nav inter-apps ---------- */
.site-header__nav {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    margin-right: auto;        /* pousse le bloc user à droite */
    flex-wrap: wrap;
    min-width: 0;
}

.site-header__home,
.site-header__link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.7rem;
    border-radius: 999px;
    border: 1px solid var(--sh-link-border);
    background: var(--sh-link-bg);
    color: var(--sh-text);
    font-size: 0.82rem;
    font-weight: 600;
    text-decoration: none;
    line-height: 1;
    transition: background 0.15s, color 0.15s, border-color 0.15s, transform 0.05s;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}
.site-header__home { padding: 0.4rem 0.55rem; }
.site-header__home:hover,
.site-header__link:hover {
    background: var(--sh-link-hover);
    color: var(--sh-link-hovtx);
    border-color: var(--sh-link-hovbd);
}
.site-header__home:active,
.site-header__link:active { transform: scale(0.97); }
.site-header__link svg,
.site-header__home svg { flex-shrink: 0; }

/* ---------- Bloc utilisateur ---------- */
.site-header__user {
    display: flex;
    align-items: center;
    gap: 0.4rem 0.5rem;
    margin: 0;
    min-width: 0;
    flex-wrap: nowrap;
}

.site-header__greet {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.65rem;
    background: var(--sh-link-bg);
    border: 1px solid var(--sh-link-border);
    border-radius: 999px;
    color: var(--sh-text);
    font-size: 0.82rem;
    font-weight: 500;
    min-width: 0;
    max-width: 100%;
}
.site-header__greet-icon { line-height: 1; font-size: 0.95rem; }
.site-header__greet-name {
    color: var(--sh-text-strong);
    font-weight: 700;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 12rem;
}
.site-header__role {
    display: inline-block;
    padding: 0.1rem 0.45rem;
    border-radius: 999px;
    font-size: 0.65rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    line-height: 1.4;
    /* Couleurs par défaut (rôle inconnu / etudiant) */
    background: rgba(120, 144, 156, 0.18);
    color: var(--sh-text-muted);
    border: 1px solid rgba(120, 144, 156, 0.35);
}
.site-header__role--admin {
    background: rgba(239, 68, 68, 0.15);
    color: #c62828;
    border-color: rgba(239, 68, 68, 0.4);
}
.site-header__role--acces {
    background: rgba(9, 132, 227, 0.15);
    color: var(--sh-accent);
    border-color: rgba(9, 132, 227, 0.4);
}
.site-header__role--colab {
    background: rgba(46, 125, 50, 0.15);
    color: #2e7d32;
    border-color: rgba(46, 125, 50, 0.4);
}

/* Variante dark : palette plus lumineuse sur fond sombre */
.site-header--dark .site-header__role--admin {
    background: rgba(248, 113, 113, 0.20);
    color: #fca5a5;
    border-color: rgba(248, 113, 113, 0.45);
}
.site-header--dark .site-header__role--acces {
    background: rgba(116, 185, 255, 0.18);
    color: #93c5fd;
    border-color: rgba(116, 185, 255, 0.45);
}
.site-header--dark .site-header__role--colab {
    background: rgba(110, 231, 183, 0.18);
    color: #86efac;
    border-color: rgba(110, 231, 183, 0.40);
}
.site-header--dark .site-header__role {
    background: rgba(203, 213, 225, 0.12);
    color: #cbd5e1;
    border-color: rgba(203, 213, 225, 0.30);
}

.site-header__logout {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--sh-link-bg);
    border: 1px solid var(--sh-link-border);
    color: var(--sh-text);
    border-radius: 999px;
    padding: 0.4rem 0.85rem;
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 600;
    transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.05s;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}
.site-header__logout:hover {
    background: rgba(239, 68, 68, 0.10);
    border-color: rgba(239, 68, 68, 0.4);
    color: var(--sh-danger);
}
.site-header__logout:active { transform: scale(0.97); }

.site-header__error {
    font-size: 0.85rem;
    color: var(--sh-danger);
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.25);
    padding: 0.25rem 0.65rem;
    border-radius: 999px;
}

.site-header__auth-link {
    display: inline-flex;
    align-items: center;
    padding: 0.4rem 0.85rem;
    background: var(--sh-link-bg);
    border: 1px solid var(--sh-link-border);
    color: var(--sh-text);
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.15s, border-color 0.15s;
}
.site-header__auth-link--primary {
    background: var(--sh-accent);
    color: var(--sh-accent-fg);
    border-color: transparent;
    box-shadow: 0 2px 8px var(--sh-accent-glow);
}
.site-header__auth-link:hover {
    background: var(--sh-link-hover);
    border-color: var(--sh-link-hovbd);
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
    .site-header { padding: 0.4rem 0.6rem; gap: 0.3rem 0.4rem; }
    .site-header__link-label { display: none; }
    .site-header__link { padding: 0.4rem 0.5rem; }
    .site-header__greet { padding: 0.2rem 0.5rem; font-size: 0.78rem; }
    .site-header__greet-name { max-width: 7rem; }
    .site-header__logout-label { display: none; }
    .site-header__logout { padding: 0.4rem 0.55rem; }
}
@media (max-width: 420px) {
    /* On garde nom + badge rôle (identité essentielle).
       Seule l'icône 👋 saute pour économiser la place. */
    .site-header__greet { padding: 0.15rem 0.4rem; gap: 0.25rem; }
    .site-header__greet-icon { display: none; }
    .site-header__greet-name { max-width: 5rem; }
    .site-header__role {
        padding: 0.08rem 0.35rem;
        font-size: 0.6rem;
        letter-spacing: 0.04em;
    }
}