/* Members area: quiet reading pages on top of base.css. */

body { background: #fff; }

.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px var(--gutter);
  background: var(--sky);
  border-bottom: 5px solid var(--grass);
  box-shadow: 0 5px 0 var(--topsoil);
}
.topbar__brand { font-size: var(--step-1); text-decoration: none; }
.topbar__nav { display: flex; gap: 14px; flex-wrap: wrap; }
.topbar__nav a { color: #fff; font-weight: 800; text-decoration: none; }
.topbar__nav a:hover { text-decoration: underline; color: #fff; }

.lesson { width: min(100% - 2 * var(--gutter), 720px); margin: 28px auto 64px; }
.lesson__head { margin-bottom: 22px; }
.lesson__depth { color: var(--soil); font-weight: 900; margin: 0 0 6px; }
.lesson__head h1 { font-size: clamp(var(--step-3), 7vw, var(--step-4)); }
.lesson__summary { color: var(--ink-soft); font-size: var(--step-1); }

.lesson__body { max-width: var(--measure); }
.lesson__body h2 { font-size: var(--step-2); margin-top: 1.6em; }
.lesson__body h3 { margin-top: 1.3em; }
.lesson__body img { border-radius: 10px; border: 2px solid var(--line); margin: 1em 0; }
.lesson__body li { margin-bottom: 0.35em; }
.lesson__body code { background: #f1efe9; padding: 0.1em 0.35em; border-radius: 4px; font-size: 0.92em; }
.lesson__body pre code { background: none; padding: 0; }
.lesson__body pre:not(.prompt pre) { background: #f6f4ef; padding: 12px; border-radius: 10px; overflow-x: auto; }
.prompt pre { margin: 0; font-family: inherit; white-space: pre-wrap; }
.note__title { font-weight: 900; margin: 0 0 4px; }

li.check { list-style: none; margin-left: -1.2em; display: flex; gap: 10px; align-items: flex-start; }
li.check input { width: 22px; height: 22px; margin-top: 2px; flex: none; accent-color: var(--grass-deep); }

.badge { display: inline-block; font-size: var(--step--1); font-weight: 900; padding: 1px 8px; border-radius: 999px;
         border: 2px solid var(--ink); background: var(--caption); color: var(--ink); vertical-align: 2px; }

.lesson__done { margin: 36px 0 18px; }
.lesson__done .btn[aria-pressed="true"] { background: #d7f0cc; }

.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; border-top: 2px solid var(--line); padding-top: 18px; }
.pager a { display: flex; flex-direction: column; gap: 2px; text-decoration: none; color: var(--ink);
           border: 2px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.pager a:hover { border-color: var(--ink); }
.pager__next { text-align: right; grid-column: 2; }
.pager__label { font-size: var(--step--1); font-weight: 800; color: var(--ink-soft); }
.pager__title { font-weight: 800; }

/* Index: the module list as a borehole log. */
.log { list-style: none; margin: 0; padding: 0; border-left: 8px solid var(--topsoil); }
.log li { position: relative; padding: 0 0 0 18px; }
.log a { display: block; padding: 14px 14px 14px 0; text-decoration: none; color: var(--ink); border-bottom: 1px dashed var(--line); }
.log a:hover .log__title { text-decoration: underline; }
.log__depth { display: block; font-size: var(--step--1); font-weight: 900; color: var(--soil); }
.log__title { font-weight: 900; font-size: var(--step-1); }
.log__sum { display: block; color: var(--ink-soft); font-size: 0.95rem; }
.log li::before { content: ""; position: absolute; left: -14px; top: 22px; width: 20px; height: 20px; border-radius: 50%;
                  background: #fff; border: 3px solid var(--topsoil); }
.log li.is-done::before { background: var(--grass); border-color: var(--grass-deep); }
.log li.is-locked a { color: var(--ink-soft); }
.progress { font-weight: 800; margin: 0 0 18px; }
.upgrade { margin: 0 0 24px; }
.files { list-style: none; padding: 0; }
.files li { padding: 12px 0; border-bottom: 1px dashed var(--line); }
.files a { font-weight: 800; }
.files__meta { color: var(--ink-soft); font-size: var(--step--1); margin-left: 6px; }
.files__empty { color: var(--ink-soft); }