/* Learn Chinese section for the uschina.us home page.
   Loads after main.css. Every selector starts with .learn so nothing else on the page changes. */

.learn {
  --learn-green: #1a472a;
  --learn-seal: #b3302a;
  --learn-ink: #1b2420;
  --learn-muted: #55605a;
  --learn-rule: #d9ded9;
  --learn-tint: #f2f5f2;
  --learn-sheet: #ffffff;
  background: var(--learn-tint);
  color: var(--learn-ink);
  border-top: 1px solid var(--learn-rule);
  border-bottom: 1px solid var(--learn-rule);
  padding: 56px 0 64px;
}

.learn .wrap > * + * { margin-top: 40px; }

.learn h2 {
  font-family: "Merriweather", Georgia, serif;
  font-weight: 900;
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  line-height: 1.15;
  margin: 0 0 14px;
  max-width: 22em;
  color: var(--learn-green);
}

.learn h3 {
  font-family: "Merriweather", Georgia, serif;
  font-size: 1.05rem;
  line-height: 1.3;
  margin: 0 0 6px;
}

.learn p { line-height: 1.6; margin: 0; }

.learn .learn-lede {
  font-size: 1.1rem;
  max-width: 44em;
  color: var(--learn-ink);
}

.learn-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }

.learn-btn {
  display: inline-block;
  padding: 12px 20px;
  border: 2px solid var(--learn-green);
  border-radius: 4px;
  font-weight: 600;
  text-decoration: none;
  line-height: 1.2;
}
.learn-btn.solid { background: var(--learn-green); color: #fff; }
.learn-btn.line { background: transparent; color: var(--learn-green); }
.learn-btn:focus-visible { outline: 3px solid var(--learn-seal); outline-offset: 2px; }

/* the demonstration: one character taken apart */
.learn-demo {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 32px;
  align-items: center;
  background: var(--learn-sheet);
  border: 1px solid var(--learn-rule);
  border-left: 5px solid var(--learn-seal);
  padding: 28px 32px;
}

.learn-build {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  font-family: "Noto Serif TC", "Songti TC", "PMingLiU", serif;
}
.learn-build .part,
.learn-build .whole {
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1;
}
.learn-build .glyph { font-size: clamp(3.4rem, 9vw, 5.6rem); }
.learn-build .whole .glyph { color: var(--learn-seal); font-size: clamp(4.6rem, 12vw, 7.4rem); }
.learn-build .role {
  margin-top: 10px;
  font-family: "Public Sans", system-ui, sans-serif;
  font-size: 0.85rem;
  color: var(--learn-muted);
}
.learn-build .op {
  font-family: "Public Sans", system-ui, sans-serif;
  font-size: 2rem;
  color: var(--learn-muted);
}

.learn-demo .why p + p { margin-top: 10px; }

/* the four counts */
.learn-counts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 0;
  border-top: 2px solid var(--learn-green);
}
.learn-counts div { padding: 16px 16px 4px 0; }
.learn-counts dt {
  order: 2;
  font-size: 0.92rem;
  color: var(--learn-muted);
  line-height: 1.4;
}
.learn-counts dd {
  margin: 0;
  font-family: "Merriweather", Georgia, serif;
  font-weight: 900;
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  color: var(--learn-green);
  font-variant-numeric: tabular-nums;
}
.learn-counts div { display: flex; flex-direction: column; }
.learn-counts dd { order: 1; }

/* how fast the words arrive */
.learn-curve { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 40px; align-items: start; }
.learn-curve h3 { font-size: 1.25rem; margin-bottom: 14px; }
.learn-rows { list-style: none; margin: 0; padding: 0; }
.learn-rows li { padding: 10px 0; border-bottom: 1px solid var(--learn-rule); }
.learn-rows li:first-child { border-top: 1px solid var(--learn-rule); }
.learn-rows .what { display: flex; justify-content: space-between; gap: 16px; font-size: 0.95rem; margin-bottom: 6px; }
.learn-rows .what b { font-weight: 700; }
.learn-rows .what span { color: var(--learn-muted); font-variant-numeric: tabular-nums; }
.learn-track { height: 10px; background: #dfe5e0; border-radius: 2px; overflow: hidden; }
.learn-track i { display: block; height: 100%; background: var(--learn-green); }
.learn-curve .note p + p { margin-top: 12px; }

/* how it works */
.learn-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.learn-step { background: var(--learn-sheet); border: 1px solid var(--learn-rule); padding: 20px 22px; }
.learn-step p { font-size: 0.97rem; color: var(--learn-ink); }
.learn-step .zh { font-family: "Noto Serif TC", "Songti TC", serif; }

.learn-limits {
  border-left: 4px solid var(--learn-green);
  padding: 4px 0 4px 18px;
  max-width: 48em;
  color: var(--learn-muted);
}

@media (max-width: 900px) {
  .learn { padding: 40px 0 48px; }
  .learn-demo,
  .learn-curve { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .learn-counts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .learn-steps { grid-template-columns: minmax(0, 1fr); }
  .learn-demo { padding: 22px 20px; }
}