/* Variables du thème : base neutre, surchargée par institutional-brand.css. */
:root{--istga-brand-primary:#22272e;--istga-brand-secondary:#667085;--istga-background:#f7f8fa;--istga-surface:#fff;--istga-text:#171b22;--istga-border:#e2e4e8;--color-soft:#f0f1f3;--ink:#1b2027;--muted:#69717d;--success:#21734d;--danger:#b42318}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--istga-background);color:var(--istga-text);font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-underline-offset:4px}:focus-visible{outline:3px solid #535b65!important;outline-offset:3px}.skip-link{position:absolute;top:-90px;left:12px;z-index:10000;background:#fff;color:#111;padding:10px 16px;box-shadow:0 3px 18px #0002}.skip-link:focus{top:8px}.btn-ink{background:var(--ink);border:1px solid var(--ink);color:#fff;font-weight:650;padding:.78rem 1.2rem;border-radius:9px;display:inline-flex;align-items:center;gap:1rem;justify-content:center;transition:transform .16s ease,background .16s ease}.btn-ink:hover,.btn-ink:focus{background:#383e47;border-color:#383e47;color:#fff;transform:translateY(-1px)}.btn-ink:disabled{background:#8a8f96;border-color:#8a8f96}.btn-light{background:#f0f1f3;border:1px solid #dedfe3;color:#252b32;padding:.77rem 1.12rem;border-radius:9px;font-weight:600}.btn-light:hover{background:#e7e9eb}