body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background:
        radial-gradient(circle at 20% 20%, rgba(31, 99, 145, 0.18), transparent 45%),
        radial-gradient(circle at 80% 80%, rgba(190, 58, 50, 0.10), transparent 40%),
        var(--cg-body-bg);
    padding: 16px;
}
.login-container {
    background: var(--cg-surface);
    border: 1px solid var(--cg-border);
    border-radius: var(--bs-border-radius-lg);
    box-shadow: var(--cg-shadow-2);
    padding: 36px 32px;
    width: 100%;
    max-width: 400px;
}
.login-header { text-align: center; margin-bottom: 24px; }
.login-logo {
    width: 56px; height: 56px; margin: 0 auto 10px; border-radius: 12px;
    background: var(--cg-accent-muted); color: var(--primary-accent);
    display: flex; align-items: center; justify-content: center; font-size: 1.6rem;
}
.login-header h1 { font-size: 1.4rem; font-weight: 700; margin-bottom: 4px; }
.login-header p { color: var(--cg-text-muted); margin: 0; }
.btn-login { background: var(--primary-accent); border: none; padding: 12px; font-weight: 600; }
.btn-login .loading { display: none; }
.btn-login.is-loading .login-text { display: none; }
.btn-login.is-loading .loading { display: inline; }
.login-footnote { color: var(--cg-text-muted); font-size: 0.78rem; text-align: center; margin: 0; }
.login-theme-toggle {
    position: fixed; top: 14px; right: 14px; border: 1px solid var(--cg-border);
    background: var(--cg-surface); color: var(--cg-text-muted); border-radius: 999px;
    width: 38px; height: 38px;
}