theoldreader: consistent font-size by pabe

/* ==UserStyle==
@name        theoldreader.com fix font sizes
@description TheOldReader is a good CSS feed reader. However, little things in its CSS feel clunky, especially on the font size front where it lacks consistency.
@version     202409180931
@namespace   pabe
@author      pabe (https://userstyles.world/user/pabe)
@licence.    MIT
@var text    font-size "Base font size" 15px
==/UserStyle== */


@-moz-document domain("theoldreader.com") {
    :root {
        --line-height: 1.4;
    }

    body {
        font-size: var(--font-size);
        line-height: var(--line-height);
    }

    /* ----- POST CONTENT ----- */

    .content-body,
    .content-body p, 
    .content-body ul li,
    .post blockquote p {
        font-size: inherit;
        line-height: inherit;
    }

    .content-body ul li {
        margin-top: calc(var(--font-size)/2);
    }

    /* It was part of the inline font size styles, 
      but I can't find where it's used */
    .content-body h2 {
        font-size: 200%;
    }

    pre {
        font-size: inherit;
    }


    .post h3 {
        font-size: 150%;
        margin-top: calc(var(--font-size) * 2);
    }
    
    .post h3:first-child {
        margin-top: inherit;
    }

    .post h4 {
        font-size: 130%;
        margin-top: calc(var(--font-size) * 1.5);
    }
    .post h5 {
        font-size: 115%;
        margin-top: calc(var(--font-size) * 1.5);
    }
    .post h5 {
        font-size: 105%;
        margin-top: calc(var(--font-size) * 1.2);
    }


    /* ----- SIDEBAR ----- */

    /* Feed groups in sidebar */
    .nav-header {
        font-size: inherit;
    }

    /* Feed titles in sidebar */
    .nav-list li.nav-header a, 
    .nav-list li.nav-header a:hover, 
    .nav-list li.nav-header a:focus,
    .nav-list li a, 
    .nav-list li a:hover, 
    .nav-list li a:focus {
      font-size: inherit;
    }


    /* Feed name label in post list */
    .post .label {
        font-size: 90%;
        padding: 4px 6px;
    }

    /* ----- TOP LEVEL NAVBAR ----- */

    .navbar-default .navbar-nav > li > a {
        font-size: inherit;
    }

    /* Top right menu */
    .dropdown-menu {
        font-size: inherit;
    }

    /* ----- OTHER THINGS ----- */

    .btn, .btn-sm {
        font-size: 90%;
    }
}