/* ランディングページ（lps#show）専用のスタイル */

:root {
  --lp-red: #b91c1c;
  --lp-red-dark: #7f1d1d;
  --lp-red-light: #ef4444;
  --lp-ink: #1f2937;
  --lp-muted: #6b7280;
  --lp-surface: #fff5f5;
  --lp-radius: 1rem;
  --lp-section-gap: 4.5rem;
}

/* ヒーロー */
.lp-hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  padding: 4rem 2rem 4.5rem;
  border-radius: 1.5rem;
  background:
    radial-gradient(circle at 15% 20%, rgba(255, 255, 255, 0.18), transparent 55%),
    linear-gradient(135deg, var(--lp-red-light) 0%, var(--lp-red) 45%, var(--lp-red-dark) 100%);
}

/* ヒーロー背面の装飾アイコン（透過PNG の透かし） */
.lp-hero__mark {
  position: absolute;
  right: -0.5rem;
  bottom: -1rem;
  width: clamp(9rem, 22vw, 18rem);
  height: auto;
  opacity: 0.22;
  pointer-events: none;
  user-select: none;
  transform: rotate(-6deg);
}

.lp-hero__inner {
  position: relative;
  z-index: 1;
}

/* 装飾用の透かし文字 */
.lp-hero__watermark {
  position: absolute;
  right: -0.15em;
  bottom: -0.35em;
  margin: 0;
  font-size: clamp(9rem, 26vw, 20rem);
  font-weight: 700;
  line-height: 0.8;
  letter-spacing: 0.02em;
  color: rgba(255, 255, 255, 0.09);
  pointer-events: none;
  user-select: none;
}

.lp-hero__title {
  font-size: clamp(2.75rem, 8vw, 4.5rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}

.lp-hero__pinyin {
  font-size: 1.05rem;
  letter-spacing: 0.18em;
  color: rgba(255, 255, 255, 0.8);
}

.lp-hero__catch {
  font-size: clamp(1.4rem, 4vw, 2rem);
  font-weight: 700;
}

.lp-hero__lead {
  max-width: 34rem;
  color: rgba(255, 255, 255, 0.88);
}

.lp-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 999px;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.9);
  background: rgba(255, 255, 255, 0.1);
}

.lp-cta {
  --bs-btn-color: var(--lp-red);
  --bs-btn-bg: #fff;
  --bs-btn-border-color: #fff;
  --bs-btn-hover-color: var(--lp-red-dark);
  --bs-btn-hover-bg: #fff;
  --bs-btn-hover-border-color: #fff;
  --bs-btn-active-bg: #f8f8f8;
  font-weight: 700;
  border-radius: 999px;
  padding: 0.85rem 2.25rem;
  box-shadow: 0 0.75rem 1.75rem rgba(0, 0, 0, 0.18);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.lp-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 1rem 2.25rem rgba(0, 0, 0, 0.24);
}

/* セクション共通 */
.lp-section {
  padding: var(--lp-section-gap) 0;
}

.lp-section--tinted {
  padding: var(--lp-section-gap) 2rem;
  border-radius: 1.5rem;
  background: var(--lp-surface);
}

.lp-section__title {
  font-weight: 700;
  color: var(--lp-ink);
}

.lp-section__lead {
  color: var(--lp-muted);
}

/* カード */
.lp-card {
  height: 100%;
  border: 1px solid rgba(185, 28, 28, 0.1);
  border-radius: var(--lp-radius);
  background: #fff;
  box-shadow: 0 0.25rem 1rem rgba(31, 41, 55, 0.06);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.lp-card:hover,
.lp-card:focus-visible {
  transform: translateY(-6px);
  border-color: rgba(185, 28, 28, 0.35);
  box-shadow: 0 1rem 2rem rgba(31, 41, 55, 0.12);
}

.lp-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 0.9rem;
  font-size: 1.5rem;
  color: var(--lp-red);
  background: rgba(185, 28, 28, 0.08);
}

/* 学習の流れのステップ番号 */
.lp-step__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  font-weight: 700;
  color: #fff;
  background: var(--lp-red);
}

/* 級カード */
.lp-level__label {
  font-weight: 700;
  color: var(--lp-red);
  letter-spacing: 0.02em;
}

/* スクロール時のフェードイン。JS が無効な場合はそのまま表示される */
.lp-reveal {
  opacity: 1;
  transform: none;
}

.lp-reveal.is-hidden {
  opacity: 0;
  transform: translateY(1.25rem);
}

.lp-reveal.is-visible {
  opacity: 1;
  transform: none;
  transition: opacity 0.6s ease, transform 0.6s ease;
}

@media (prefers-reduced-motion: reduce) {
  .lp-cta,
  .lp-card,
  .lp-reveal,
  .lp-reveal.is-visible {
    transition: none;
  }

  .lp-cta:hover,
  .lp-card:hover,
  .lp-card:focus-visible {
    transform: none;
  }

  .lp-reveal.is-hidden {
    opacity: 1;
    transform: none;
  }
}