body { background: linear-gradient(135deg, var(--brand-50) 0%, var(--ink-100) 100%); }
    .login-shell {
        min-height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 2rem 1rem;
    }
    .login-card {
        background: var(--surface);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-lg);
        padding: 3rem 2.5rem;
        max-width: 460px;
        width: 100%;
        text-align: center;
    }
    .login-logo { max-width: 200px; margin-bottom: 1.5rem; }
    .login-title { font-size: 1.5rem; margin-bottom: 0.5rem; }
    .login-sub { color: var(--ink-500); margin-bottom: 2rem; }
    .ms-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.75rem;
        padding: 0.9rem 1.5rem;
        background: var(--ink-900);
        color: white;
        border-radius: var(--radius-sm);
        font-weight: 500;
        font-size: 1rem;
        border: none;
        cursor: pointer;
        width: 100%;
        transition: background 0.15s ease;
    }
    .ms-btn:hover { background: var(--ink-800); color: white; text-decoration: none; }
    .ms-btn img { width: 20px; height: 20px; }