:root {
    --sf-primary: #0f172a;
    --sf-accent: #2563eb;
    --sf-app-bg: #f8fafc;
    --sf-app-text: #0f172a;
    --sf-surface: #ffffff;
    --sf-border: #dbe4f0;
    --sf-btn-height: 44px;
    --sf-btn-height-sm: 40px;
    --sf-btn-radius: 12px;
    --sf-btn-font-size: 0.95rem;
    /* Champs formulaires (identité visuelle unique clair / sombre) */
    --sf-input-bg: #ffffff;
    --sf-input-border: #cbd5e1;
    --sf-input-fg: #0f172a;
    --sf-input-placeholder: #64748b;
    --sf-input-focus: #2563eb;
    --sf-focus-ring: rgba(37, 99, 235, 0.14);
    color-scheme: light;
}

.dark-theme {
    --sf-app-bg: #0b1220;
    --sf-app-text: #e2e8f0;
    --sf-surface: #0f172a;
    --sf-border: #334155;
    --sf-input-bg: #0f172a;
    --sf-input-border: #334155;
    --sf-input-fg: #e2e8f0;
    --sf-input-placeholder: #94a3b8;
    --sf-input-focus: #3b82f6;
    --sf-focus-ring: rgba(59, 130, 246, 0.22);
    color-scheme: dark;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--sf-app-bg);
    color: var(--sf-app-text);
    transition: background-color 0.2s ease, color 0.2s ease;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.theme-switch,
.theme-toggle {
    border: 1px solid var(--sf-input-border);
    background: var(--sf-input-bg);
    color: var(--sf-input-fg);
    border-radius: var(--sf-btn-radius);
    width: var(--sf-btn-height-sm);
    height: var(--sf-btn-height-sm);
    padding: 0;
    display: inline-grid;
    place-items: center;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.2s ease, border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.theme-switch svg,
.theme-toggle svg {
    width: 19px;
    height: 19px;
}

.theme-switch:hover,
.theme-toggle:hover {
    transform: translateY(-1px);
    border-color: #93c5fd;
    box-shadow: 0 8px 16px rgba(15, 23, 42, 0.08);
}

.theme-switch:focus-visible,
.theme-toggle:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.28);
    outline-offset: 2px;
}

.dark-theme .theme-switch,
.dark-theme .theme-toggle {
    background: var(--sf-input-bg);
    color: var(--sf-input-fg);
    border-color: var(--sf-input-border);
}

.dark-theme .theme-switch:hover,
.dark-theme .theme-toggle:hover {
    color: #60a5fa;
    border-color: #60a5fa;
    box-shadow: 0 8px 16px rgba(2, 6, 23, 0.35);
}

.sf-footer {
    border-top: 1px solid var(--sf-border);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(248, 250, 252, 0.96));
    backdrop-filter: blur(6px);
}

.sf-footer__inner {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0.65rem clamp(0.75rem, 2vw, 1.2rem);
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr) minmax(0, 1fr);
    gap: 0.65rem;
    align-items: start;
}

.sf-footer__brand-block {
    display: grid;
    gap: 0.28rem;
}

.sf-footer__brand {
    display: inline-flex;
    align-items: center;
    gap: 0.42rem;
}

.sf-footer__logo {
    width: 1.6rem;
    height: 1.6rem;
    border-radius: 0.48rem;
    display: inline-grid;
    place-items: center;
    color: #fff;
    background: linear-gradient(145deg, #2563eb, #1d4ed8);
}

.sf-footer__logo svg {
    width: 0.88rem;
    height: 0.88rem;
}

.sf-footer__brand strong {
    display: block;
    line-height: 1.2;
    font-size: 0.82rem;
}

.sf-footer__brand small {
    color: #64748b;
    font-size: 0.68rem;
}

.sf-footer__tagline {
    margin: 0;
    color: #475569;
    font-size: 0.7rem;
    line-height: 1.35;
    max-width: 32ch;
}

.sf-footer__links {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.5rem;
}

.sf-footer__nav {
    display: grid;
    gap: 0.24rem;
}

.sf-footer__nav h3 {
    margin: 0 0 0.15rem;
    color: #0f172a;
    font-size: 0.64rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.sf-footer__nav a {
    text-decoration: none;
    color: #334155;
    font-size: 0.74rem;
    font-weight: 600;
    width: fit-content;
    border-radius: 0.38rem;
    padding: 0.09rem 0.18rem;
    margin-left: -0.25rem;
}

.sf-footer__nav a:hover {
    color: #1d4ed8;
    background: #eff6ff;
}

.sf-footer__nav .sf-logout-form {
    display: block;
    width: fit-content;
    margin: 0;
    margin-left: -0.25rem;
}

.sf-footer__nav .sf-logout-form button.sf-footer__nav-logout {
    background: none;
    border: none;
    cursor: pointer;
    color: #334155;
    font: inherit;
    font-size: 0.74rem;
    font-weight: 600;
    border-radius: 0.38rem;
    padding: 0.09rem 0.18rem;
    text-align: left;
    width: fit-content;
    display: block;
}

.sf-footer__nav .sf-logout-form button.sf-footer__nav-logout:hover {
    color: #1d4ed8;
    background: #eff6ff;
}

.sf-footer__contact-fallback {
    font-size: 0.72rem;
    color: #94a3b8;
    font-style: italic;
}

.sf-footer__extras {
    display: grid;
    gap: 0.3rem;
    justify-items: end;
}

.sf-footer__contact {
    display: flex;
    gap: 0.28rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.sf-footer__contact a {
    color: #475569;
    text-decoration: none;
    font-size: 0.7rem;
    border-radius: 0.36rem;
    padding: 0.08rem 0.18rem;
    margin-right: -0.3rem;
}

.sf-footer__contact a:hover {
    color: #1d4ed8;
    background: #eff6ff;
}

.sf-footer__social {
    display: flex;
    gap: 0.24rem;
}

.sf-footer__social a {
    width: 1.75rem;
    height: 1.75rem;
    border-radius: 999px;
    border: 1px solid #cbd5e1;
    display: inline-grid;
    place-items: center;
    color: #334155;
    text-decoration: none;
    transition: all 0.2s ease;
}

.sf-footer__social a:hover {
    color: #1d4ed8;
    border-color: #93c5fd;
    transform: translateY(-1px);
}

.sf-footer__social svg {
    width: 0.78rem;
    height: 0.78rem;
}

.sf-footer__meta {
    text-align: right;
    display: grid;
    gap: 0.15rem;
    font-size: 0.66rem;
    color: #64748b;
}

.dark-theme .sf-footer {
    background: rgba(15, 23, 42, 0.86);
    border-top-color: #334155;
}

.dark-theme .sf-footer__tagline {
    color: #94a3b8;
}

.dark-theme .sf-footer__brand strong,
.dark-theme .sf-footer__nav a,
.dark-theme .sf-footer__nav h3 {
    color: #e2e8f0;
}

.dark-theme .sf-footer__brand small,
.dark-theme .sf-footer__meta,
.dark-theme .sf-footer__contact a {
    color: #94a3b8;
}

.dark-theme .sf-footer__nav a:hover {
    color: #60a5fa;
    background: rgba(30, 41, 59, 0.8);
}

.dark-theme .sf-footer__nav .sf-logout-form button.sf-footer__nav-logout {
    color: #e2e8f0;
}

.dark-theme .sf-footer__nav .sf-logout-form button.sf-footer__nav-logout:hover {
    color: #60a5fa;
    background: rgba(30, 41, 59, 0.8);
}

.dark-theme .sf-footer__social a {
    border-color: #334155;
    color: #cbd5e1;
    background: rgba(15, 23, 42, 0.4);
}

.dark-theme .sf-footer__social a:hover {
    border-color: #60a5fa;
    color: #60a5fa;
}

.dark-theme .sf-footer__contact a:hover {
    color: #60a5fa;
    background: rgba(30, 41, 59, 0.8);
}

@media (max-width: 900px) {
    .sf-footer__inner {
        grid-template-columns: 1fr;
        text-align: left;
        padding: 0.75rem 0.9rem;
    }

    .sf-footer__links {
        grid-template-columns: 1fr;
    }

    .sf-footer__tagline {
        max-width: 100%;
    }

    .sf-footer__extras,
    .sf-footer__meta {
        text-align: left;
        justify-items: start;
    }

    .sf-footer__contact {
        justify-content: flex-start;
    }
}