/* Home page: hero and lesson cards. */

.home-header {
  padding: 16px 0 8px;
}

.hero {
  display: flex;
  align-items: center;
  gap: 24px;
  margin: 12px 0 28px;
  padding: clamp(18px, 4vw, 32px);
  border-radius: 28px;
  background: var(--bg-accent);
}

.hero-owl {
  width: clamp(90px, 16vw, 140px);
  height: auto;
  flex: none;
}

.hero h1 {
  margin: 0 0 6px;
  font-size: clamp(1.7rem, 4.6vw, 2.8rem);
  line-height: 1.1;
}

.hero p {
  margin: 0;
  max-width: 560px;
  color: var(--ink-soft);
  font-size: clamp(1rem, 2vw, 1.2rem);
}

@media (max-width: 560px) {
  .hero {
    flex-direction: column;
    text-align: center;
  }
}

.section-title {
  margin: 0 0 12px;
  font-size: 1.4rem;
}

.lesson-card {
  display: grid;
  grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
  overflow: hidden;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 6px 0 var(--line), var(--shadow-soft);
}

@media (max-width: 720px) {
  .lesson-card {
    grid-template-columns: 1fr;
  }
}

.lesson-art {
  display: grid;
  place-items: center;
  padding: 18px;
  border-right: 8px solid var(--board-wood);
  background:
    radial-gradient(ellipse at 20% 15%, rgba(255, 255, 255, 0.08), transparent 55%),
    var(--board);
}

@media (max-width: 720px) {
  .lesson-art {
    border-right: 0;
    border-bottom: 8px solid var(--board-wood);
  }
}

.lesson-art svg {
  width: 100%;
  max-width: 320px;
}

.art-frame rect,
.art-frame path {
  fill: none;
  stroke: rgba(244, 241, 232, 0.7);
  stroke-width: 2.5;
}

.art-frame path {
  stroke-dasharray: 3 5;
  stroke-opacity: 0.6;
}

.art-chalk {
  font-family: var(--font-chalk);
  font-size: 44px;
  fill: var(--chalk);
}

.art-tens {
  fill: var(--c-tens);
}

.art-ones {
  fill: var(--c-ones);
}

.lesson-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 3vw, 26px);
}

.lesson-kicker {
  color: var(--brand-deep);
  font-size: 0.9rem;
  font-weight: 700;
}

@media (prefers-color-scheme: dark) {
  .lesson-kicker {
    color: var(--brand);
  }
}

.lesson-body h3 {
  margin: 0;
  font-size: 1.7rem;
  line-height: 1.15;
}

.lesson-body p {
  margin: 0;
  color: var(--ink-soft);
}

.lesson-parts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 6px 0;
  padding: 0;
  list-style: none;
}

.lesson-parts a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
  padding: 4px 12px 4px 6px;
  border: 2px solid var(--line);
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
}

.lesson-parts b {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--line);
  font-size: 0.85rem;
}

.lesson-parts a.is-done {
  border-color: var(--good);
}

/* A finished part swaps its number for a tick. */
.lesson-parts a.is-done b {
  position: relative;
  background: var(--good);
  color: transparent;
}

.lesson-parts a.is-done b::after {
  content: "✓";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #fff;
}

.lesson-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 6px;
}

.best-stars {
  display: inline-flex;
  gap: 2px;
}

.best-stars .star {
  width: 26px;
  height: 26px;
}

.home-tip {
  margin: 24px 0 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* A group of lessons from one chapter of the textbook. */
.lesson-group {
  margin-top: 32px;
}

.lesson-list {
  display: grid;
  gap: 22px;
}

.art-result {
  fill: var(--c-result);
}

.art-label {
  font-family: var(--font-chalk);
  font-size: 24px;
  fill: var(--c-tag);
}