.learn-intro { font-size: 16px; line-height: 1.65; color: var(--muted); max-width: 760px; }
.learn-picker { margin: 26px 0; display: block; }
.learn-picker > span { display: block; color: var(--green); margin-bottom: 10px; font-size: 14px; }
.learn-picker select { width: 100%; min-height: 52px; border: 1px solid var(--line); border-radius: 12px; background: #0a211c; color: var(--ink); padding: 12px; font-size: 16px; }
.learn-card { margin-bottom: 18px; scroll-margin-top: 15px; }
.learn-card summary { cursor: pointer; }
.learn-card h2 { display: inline; font: 400 27px Georgia,serif; }
.learn-card summary .eyebrow { display: block; margin-bottom: 8px; }
.learn-card summary small { display: block; color: var(--green); margin: 8px 0 0 16px; font-size: 14px; }
.learn-card p { color: var(--muted); font-size: 16px; line-height: 1.65; }
.learn-card .learn-fixed { border-left: 2px solid #587c70; padding-left: 14px; }
.learn-lab { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 26px; margin-top: 22px; }
.learn-control { margin-bottom: 22px; }
.learn-control label { font-size: 15px; display: block; line-height: 1.4; color: var(--ink); }
.learn-control .learn-value { display: flex; align-items: center; gap: 12px; margin-top: 8px; }
.learn-control input[type=number] { width: 130px; min-height: 48px; border: 1px solid var(--line); border-radius: 10px; background: #0a211c; color: var(--ink); font-size: 16px; padding: 10px; }
.learn-control input[type=range] { width: 100%; min-height: 44px; accent-color: var(--green); margin: 6px 0 0; cursor: pointer; }
.learn-control .learn-value span { color: var(--muted); font-size: 14px; }
.learn-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.learn-actions button { min-height: 46px; border: 1px solid var(--line); border-radius: 10px; background: #0a211c; color: var(--ink); padding: 10px 14px; font-size: 15px; cursor: pointer; }
.learn-actions button:first-child { background: var(--green-deep); color: var(--green); }
.learn-display { padding: 18px; border-radius: 14px; background: #0a211c; border: 1px solid var(--line); min-width: 0; }
.learn-display svg { width: 100%; height: auto; display: block; overflow: visible; }
.learn-display svg[hidden] { display: none; }
.learn-metrics { margin: 0; display: grid; gap: 15px; }
.learn-metrics dt { font-size: 14px; line-height: 1.5; color: var(--muted); }
.learn-metrics dd { margin: 4px 0 0; color: var(--ink); font: 400 25px Georgia,serif; overflow-wrap: anywhere; }
.learn-display .learn-change { font-size: 14px; color: var(--green); }
.learn-card .learn-formula { font-size: 15px; padding: 15px; border: 1px solid var(--line); border-radius: 10px; color: var(--ink); }
.learn-links { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 18px; }
.learn-links a, .learn-card a { color: var(--green); font-size: 14px; }
.learn-error { color: var(--amber); font-size: 16px; line-height: 1.5; }
.learn-disclaimer { border: 1px solid var(--line); border-radius: 14px; padding: 20px; margin-top: 28px; }
.learn-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.learn-card :focus-visible, .learn-picker :focus-visible { outline: 2px solid var(--green); outline-offset: 4px; }
@media(max-width:760px) { .learn-lab { grid-template-columns: 1fr; gap: 18px; } .learn-card h2 { font-size: 25px; } .learn-display { padding: 16px; } }
@media(prefers-reduced-motion:reduce) { html { scroll-behavior: auto; } }

.learn-compare { display: block; margin-top: 18px; font-size: 14px; color: var(--muted); }
.learn-compare[hidden] { display: none; }
.learn-compare select { display: block; width: 100%; margin: 8px 0; min-height: 44px; font-size: 16px; color: var(--ink); background: #0a211c; border: 1px solid var(--line); border-radius: 8px; padding: 8px; }