:root{--bg:#ffffff;--text:#0f172a;--muted:#64748b;--border:#e2e8f0;--primary:#2d388a;--primary-text:#ffffff;--error:#dc2626;--error-bg:#fee2e2;--success:#16a34a;--success-bg:#dcfce7;--focus:#00aeef}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;min-height:100dvh}main{max-width:24rem;margin:0 auto;padding:1.5rem 1rem 2rem}h1{font-size:1.25rem;font-weight:600;margin:0 0 .5rem}.note{color:var(--muted);margin:0 0 1.5rem}.note,label{font-size:.875rem}label{display:block;font-weight:500;margin-bottom:.375rem}input[type=tel]{width:100%;padding:.625rem .75rem;font-size:1rem;border:1px solid var(--border);border-radius:.375rem}input[type=tel]:focus{outline:2px solid var(--focus);outline-offset:1px}input[type=tel]:invalid:not(:placeholder-shown){border-color:var(--error)}button{margin-top:1rem;width:100%;padding:.625rem 1rem;font-size:1rem;font-weight:600;color:var(--primary-text);background:var(--primary);border:none;border-radius:.375rem;cursor:pointer}button:hover:not(:disabled){filter:brightness(1.05)}button:disabled{opacity:.6;cursor:not-allowed}.status{margin-top:1rem;padding:.75rem;border-radius:.375rem;font-size:.875rem}.status.error{color:var(--error);background:var(--error-bg)}.status.success{color:var(--success);background:var(--success-bg)}.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}