:root{--bg:#eaf7ff;--bg-soft:#f5fbff;--panel:#ffffff;--text:#111827;--muted:#64748b;--border:#dbe7f3;--primary:#0b84d8;--danger:#b91c1c;--danger-bg:#fff1f2}*{box-sizing:border-box}body,html{margin:0;min-height:100%;color:var(--text);background:var(--bg);font-family:Arial,Helvetica,sans-serif}button{font:inherit}.auth-shell{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--bg) 0,var(--bg-soft) 100%);padding:24px}.auth-card{width:100%;max-width:420px;background:var(--panel);border:1px solid var(--border);border-radius:8px;box-shadow:0 4px 24px rgba(15,23,42,.08);padding:40px 36px;text-align:center}.brand{display:flex;align-items:center;justify-content:center;margin-bottom:24px}.brand-logo{display:block;width:auto;height:40px}.auth-title{margin:0;font-size:27px;line-height:1.2;font-weight:700;letter-spacing:0}.auth-subtitle{margin:8px 0 28px;color:var(--muted);font-size:15px;line-height:1.45}.provider-stack{display:grid;grid-gap:12px;gap:12px}.provider-button{display:flex;align-items:center;justify-content:center;gap:12px;min-height:50px;width:100%;padding:13px 20px;border:1px solid var(--border);border-radius:8px;background:#fff;color:#111827;font-size:15px;font-weight:700;cursor:pointer;transition:background .15s,border-color .15s,box-shadow .15s}.provider-button:hover:not(:disabled){background:var(--bg-soft);border-color:#9dc9ee;box-shadow:0 2px 8px rgba(15,23,42,.1)}.provider-button:disabled{cursor:not-allowed;opacity:.62}.provider-icon{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;flex:0 0 22px}.status{margin-top:16px;padding:0 4px;font-size:14px;line-height:1.4;text-align:center}.status,.status-error{color:var(--primary)}@media (max-width:520px){.auth-card{padding:32px 24px}.auth-title{font-size:26px}}