:root {
  color-scheme: light;
  --canvas: #f2f6f6;
  --paper: #fff;
  --ink: #183333;
  --muted: #4b6262;
  --line: #d5e2e0;
  --accent: #07594c;
  --soft: #dcefe9;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--canvas); color: var(--ink); font: 15px/1.6 system-ui, sans-serif; }
a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible, textarea:focus-visible {
  outline: 3px solid #138a78; outline-offset: 2px;
}
h1, h2, h3, p { margin: 0 0 .55em; }
h1 { font-size: clamp(1.6rem, 4vw, 2.25rem); line-height: 1.3; overflow-wrap: anywhere; }
h2 { font-size: 1.19rem; }
h3 { font-size: 1.05rem; }
.shell { width: min(100% - 32px, 1080px); margin-inline: auto; }
.site-header { background: var(--paper); border-bottom: 1px solid var(--line); }
.header-inner, .actions { display: flex; flex-wrap: wrap; align-items: center; gap: .55rem; }
.header-inner { min-height: 68px; padding-block: .7rem; gap: .75rem; }
.brand { display: inline-flex; align-items: center; gap: .6rem; color: var(--ink); font-weight: 700; text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 8px; color: #fff; background: var(--accent); }
nav { margin-inline-start: auto; display: flex; flex-wrap: wrap; align-items: center; gap: .45rem .9rem; }
nav form { margin: 0; }
.identity { color: var(--muted); font-size: .84rem; }
main.shell { padding-block: 1.7rem 3rem; }
.page-heading { margin-bottom: 1.2rem; }
.page-heading p:not(.eyebrow), .muted { color: var(--muted); }
.eyebrow { color: var(--accent); font-size: .86rem; font-weight: 700; }
.crumb { font-size: .89rem; margin-bottom: .9rem; }
.description { white-space: pre-line; overflow-wrap: anywhere; }
.panel { border: 1px solid var(--line); background: var(--paper); border-radius: 14px; padding: clamp(14px, 3vw, 23px); min-width: 0; }
.section, .notice { margin-bottom: 1rem; }
.notice { background: var(--soft); color: var(--accent); border-radius: 9px; padding: .7rem .9rem; }
.login { max-width: 620px; margin: 4vh auto; }
.catalog, .layout, .stack { display: grid; gap: 1rem; }
.catalog { grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }
.layout { grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); align-items: start; }
.stack { gap: .8rem; }
.course-card { display: grid; align-content: start; justify-items: start; gap: .5rem; }
.course-card h2, .course-card p, .stack p { margin: 0; }
.badge { display: inline-block; background: var(--soft); color: var(--accent); border-radius: 50px; padding: .12rem .55rem; font-size: .83rem; }
.badge.neutral { color: var(--muted); background: var(--canvas); }
button, .button, input, select, textarea { font: inherit; }
button, .button {
  display: inline-block; border: 1px solid var(--line); border-radius: 8px; color: var(--accent);
  background: var(--paper); padding: .52rem .8rem; text-decoration: none; cursor: pointer;
}
button.primary, .button.primary { color: #fff; border-color: var(--accent); background: var(--accent); }
button.quiet { border-color: transparent; padding-inline: 0; text-decoration: underline; }
button:disabled { opacity: .65; cursor: wait; }
label { display: grid; gap: .28rem; min-width: 0; font-weight: 600; }
input:not([type=checkbox]), textarea, select {
  width: 100%; min-width: 0; padding: .5rem .6rem; border: 1px solid var(--line);
  border-radius: 7px; background: var(--paper); color: var(--ink); font-weight: normal;
}
label.checkbox { display: flex; align-items: center; }
.item { display: flex; justify-content: space-between; flex-wrap: wrap; align-items: center; gap: .55rem; padding: .65rem 0; border-bottom: 1px solid var(--line); overflow-wrap: anywhere; }
.player { width: 100%; aspect-ratio: 16 / 9; border: 0; border-radius: 8px; background: #172928; }
details { border-top: 1px solid var(--line); padding: .65rem 0; }
summary { cursor: pointer; margin-bottom: .4rem; overflow-wrap: anywhere; }
hr { border: 0; border-top: 1px solid var(--line); margin-block: 1rem; }
table { width: 100%; border-collapse: collapse; text-align: left; }
th, td { padding: .55rem .45rem .55rem 0; border-bottom: 1px solid var(--line); vertical-align: top; overflow-wrap: anywhere; }
@media (max-width: 650px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  nav { margin-inline-start: 0; width: 100%; }
}