/**
 * Khedma — performance perçue, accessibilité, CLS
 */

/* Lien d'évitement (clavier) */
.skip-link {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    z-index: 200;
    padding: 0.55rem 1rem;
    border-radius: var(--radius-sm);
    background: var(--night);
    color: var(--cream);
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
    transform: translateY(-160%);
    transition: transform 0.2s var(--ux-ease, cubic-bezier(0.22, 1, 0.36, 1));
    box-shadow: var(--shadow-md);
}

.skip-link:focus {
    transform: translateY(0);
    outline: 2px solid var(--brand-2);
    outline-offset: 2px;
}

html[dir='rtl'] .skip-link {
    left: auto;
    right: 0.75rem;
}

/* Défilement fluide (si l'utilisateur l'autorise) */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

/* Sections hors écran : moins de travail de rendu */
.site-footer,
.mobile-bar,
.admin-sidebar {
    content-visibility: auto;
    contain-intrinsic-size: auto 120px;
}

/* Images : éviter le layout shift */
img {
    max-width: 100%;
    height: auto;
}

.match-provider-photo,
.top-match-spotlight-photo,
.pro-card-media img,
.user-avatar {
    object-fit: cover;
}

.match-provider-photo {
    width: 100px;
    height: 100px;
}

.top-match-spotlight-photo:not(.top-match-spotlight-photo--letter) {
    aspect-ratio: 1;
}

/* Bouton retour haut */
.back-to-top {
    position: fixed;
    bottom: calc(5.5rem + env(safe-area-inset-bottom, 0px));
    right: 1.25rem;
    z-index: 45;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: blur(12px);
    color: var(--text);
    display: grid;
    place-items: center;
    box-shadow: var(--shadow);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px) scale(0.9);
    transition:
        opacity 0.25s var(--ux-ease, ease),
        transform 0.25s var(--ux-ease, ease),
        visibility 0.25s;
}

html[dir='rtl'] .back-to-top {
    right: auto;
    left: 1.25rem;
}

.back-to-top.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

@media (hover: hover) and (pointer: fine) {
    .back-to-top:hover {
        transform: translateY(-3px) scale(1.06);
        border-color: var(--brand);
    }
}

/* État chargement formulaire */
.btn.is-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.88;
}

.btn.is-loading .btn-label {
    opacity: 0.75;
}

.btn.is-loading::before {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    margin-inline-end: 0.45em;
    vertical-align: -0.15em;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: ux-spin 0.65s linear infinite;
}

@keyframes ux-spin {
    to { transform: rotate(360deg); }
}

/* Menu mobile ouvert */
body.nav-open {
    overflow: hidden;
}

@media (max-width: 960px) {
    .nav-links.open {
        animation: ux-nav-in 0.22s var(--ux-ease, ease) both;
    }
}

@keyframes ux-nav-in {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Messages système — lecteurs d'écran */
.messages[role='status'] {
    scroll-margin-top: 5rem;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .back-to-top,
    .nav-links.open {
        transition: none;
        animation: none;
    }
}