/* ═══════════════════════════════════════════════
   UMBLE LEARN — Landing Page
   ═══════════════════════════════════════════════ */

/* ── HERO ── */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 120px 48px 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0,82,204,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--signal-blue);
  text-transform: uppercase;
  font-weight: 500;
  margin-bottom: 28px;
  opacity: 0;
  animation: fadeUp 0.8s 0.2s forwards;
}

.hero-headline {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: -0.03em;
  color: var(--fog);
  max-width: 800px;
  margin-bottom: 28px;
  opacity: 0;
  animation: fadeUp 0.8s 0.4s forwards;
}

.hero-headline span { color: var(--signal-blue); }

.hero-sub {
  font-size: 18px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--fog-60);
  max-width: 560px;
  margin-bottom: 48px;
  opacity: 0;
  animation: fadeUp 0.8s 0.6s forwards;
}

.hero-actions {
  display: flex;
  gap: 16px;
  align-items: center;
  opacity: 0;
  animation: fadeUp 0.8s 0.8s forwards;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 48px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  color: var(--fog-40);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 12px;
  opacity: 0;
  animation: fadeUp 0.8s 1.2s forwards;
}

.scroll-line {
  width: 32px;
  height: 1px;
  background: var(--fog-20);
  position: relative;
  overflow: hidden;
}

.scroll-line::after {
  content: '';
  position: absolute;
  left: -100%;
  top: 0;
  width: 100%;
  height: 100%;
  background: var(--signal-blue);
  animation: scrollPulse 2s infinite;
}

/* ── CATEGORY GRID ── */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 1100px;
}

/* ── HOW IT WORKS ── */
.how-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 1100px;
}

.how-connector {
  display: none;
}

/* ── FEATURED LESSON ── */
.featured-card {
  background: var(--surface);
  border: 1px solid var(--fog-10);
  border-radius: 4px;
  overflow: hidden;
  display: grid;
  grid-template-columns: 340px 1fr;
  max-width: 1100px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.3s;
}

.featured-card:hover { border-color: var(--fog-20); }

.featured-visual {
  background: var(--illus-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 16px;
  position: relative;
}

.featured-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.featured-visual .placeholder-icon {
  font-family: var(--font-mono);
  font-size: 64px;
  font-weight: 700;
  opacity: 0.1;
  color: var(--fog);
}

.featured-content {
  padding: 36px;
  border-left: 1px solid var(--fog-10);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.featured-eyebrow {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--electric);
  text-transform: uppercase;
  margin-bottom: 12px;
  font-weight: 500;
}

.featured-title {
  font-size: 22px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--fog);
  margin-bottom: 12px;
}

.featured-desc {
  font-size: 14px;
  font-weight: 300;
  line-height: 1.65;
  color: var(--fog-60);
  margin-bottom: 20px;
}

.featured-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--fog-10);
}

.featured-cta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--signal-blue);
  letter-spacing: 0.05em;
  margin-left: auto;
}

/* ── ETHOS ── */
.ethos {
  padding: 80px 48px;
  border-top: 1px solid var(--fog-10);
  background: var(--surface);
}

.ethos-inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.ethos-quote {
  font-size: 28px;
  font-weight: 300;
  line-height: 1.5;
  color: var(--fog-80);
  font-style: italic;
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

.ethos-quote strong {
  font-weight: 600;
  color: var(--fog);
  font-style: normal;
}

.ethos-attr {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--fog-40);
  text-transform: uppercase;
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .hero { padding: 100px 24px 60px; }
  .categories-grid { grid-template-columns: repeat(2, 1fr); }
  .how-grid { grid-template-columns: 1fr; }
  .featured-card { grid-template-columns: 1fr; }
  .featured-visual { height: 200px; }
  .ethos { padding: 64px 24px; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 640px) {
  .categories-grid { grid-template-columns: 1fr; }
  .hero-scroll-hint { display: none; }
  .ethos-quote { font-size: 22px; }
}