/* ===========================
   about.css — 塾について・そろばんの効能
   =========================== */

/* ページ内ナビゲーション */
.page-nav {
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: var(--header-height);
  z-index: 50;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
.page-nav__list {
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-nav__list::-webkit-scrollbar { display: none; }
.page-nav__list a {
  display: block;
  padding: 16px 22px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-text-light);
  border-bottom: 3px solid transparent;
  white-space: nowrap;
  transition: var(--transition);
}
.page-nav__list a:hover,
.page-nav__list a.is-active {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

/* =============================
   ABOUT INTRO
   ============================= */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 56px;
  align-items: start;
  margin-top: 56px;
}
.about-intro__img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow-hover);
}
.about-intro__img-caption {
  text-align: center;
  font-size: 0.82rem;
  color: var(--color-text-light);
  margin-top: 10px;
}
.about-intro__text h4 {
  font-size: clamp(1.3rem, 2.5vw, 1.7rem);
  font-weight: 700;
  color: var(--color-primary-dark);
  line-height: 1.5;
  margin-bottom: 20px;
}
.about-intro__text p {
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.9;
  margin-bottom: 16px;
}

/* 統計グリッド */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 56px;
}
.stat-item {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  border-bottom: 4px solid var(--color-primary-light);
  transition: var(--transition);
}
.stat-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-bottom-color: var(--color-accent);
}
.stat-item__number {
  font-family: var(--font-serif);
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}
.stat-item__number small {
  font-size: 1rem;
  font-family: var(--font-sans);
}
.stat-item__label {
  font-size: 0.85rem;
  color: var(--color-text-light);
  font-weight: 700;
}

/* =============================
   POLICY
   ============================= */
.policy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 48px;
}
.policy-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px 28px 32px;
  position: relative;
  transition: var(--transition);
  overflow: hidden;
}
.policy-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 5px;
  background: linear-gradient(to right, var(--color-primary), var(--color-primary-light));
}
.policy-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.policy-card__number {
  font-family: var(--font-serif);
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--color-bg-light);
  position: absolute;
  top: 10px;
  right: 20px;
  line-height: 1;
  user-select: none;
}
.policy-card__icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.policy-card__icon i { font-size: 1.4rem; color: #fff; }
.policy-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 14px;
}
.policy-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.85;
}

/* =============================
   TEACHER — 控えめカードデザイン
   ============================= */
.teacher-card {
  max-width: 720px;
  margin: 48px auto 0;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px 48px;
  border-left: 5px solid var(--color-primary-light);
}
.teacher-card__header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 20px;
}
.teacher-card__avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--color-bg-light);
  border: 3px solid var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
}
.teacher-card__avatar i {
  font-size: 1.8rem;
  color: var(--color-primary-light);
}
.teacher-card__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
}
.teacher-card__title {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.08em;
  background: var(--color-bg-light);
  padding: 3px 10px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 6px;
}
.teacher-card__name {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  line-height: 1.3;
}
.teacher-card__name span {
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--color-text-light);
  margin-left: 4px;
}
.teacher-card__quals {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}
.teacher-card__quals span {
  font-size: 0.82rem;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: 6px;
}
.teacher-card__quals i { color: var(--color-primary-light); }
.teacher-card__body p {
  font-size: 0.92rem;
  color: var(--color-text);
  line-height: 1.9;
  margin-bottom: 12px;
}
.teacher-card__quote {
  margin-top: 20px;
  padding: 14px 20px;
  background: var(--color-bg-light);
  border-radius: 8px;
  font-size: 0.88rem;
  color: var(--color-primary-dark);
  font-style: italic;
  line-height: 1.8;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.teacher-card__quote i {
  color: var(--color-primary-light);
  font-size: 1rem;
  margin-top: 3px;
  flex-shrink: 0;
}

@media (max-width: 600px) {
  .teacher-card { padding: 28px 24px; }
}

/* =============================
   BENEFITS DETAIL
   ============================= */
.benefits-lead {
  max-width: 760px;
  margin: 0 auto 48px;
  text-align: center;
}
.benefits-lead p {
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.9;
}
.benefits-detail-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.benefit-detail-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 32px;
  display: flex;
  gap: 24px;
  align-items: flex-start;
  transition: var(--transition);
}
.benefit-detail-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.benefit-detail-card__icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.benefit-detail-card__icon i { font-size: 1.5rem; color: #fff; }
.benefit-detail-card__body { flex: 1; }
.benefit-detail-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}
.benefit-detail-card__summary {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--color-border);
}
.benefit-detail-card__detail p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.85;
  margin-bottom: 10px;
}
.benefit-detail-card__detail p:last-child { margin-bottom: 0; }

/* =============================
   RESEARCH
   ============================= */
.research-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 48px;
}
.research-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 28px;
  text-align: center;
  transition: var(--transition);
  border-top: 4px solid var(--color-primary-light);
}
.research-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-top-color: var(--color-accent);
}
.research-card__icon {
  font-size: 2.4rem;
  color: var(--color-primary);
  margin-bottom: 16px;
}
.research-card h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 14px;
}
.research-card p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.85;
}

/* =============================
   VOICES ABOUT
   ============================= */
.voices-about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 48px;
}
.voice-about-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: var(--transition);
}
.voice-about-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.voice-about-card__quote i {
  font-size: 2rem;
  color: var(--color-primary-light);
  opacity: 0.5;
}
.voice-about-card p {
  font-size: 0.9rem;
  color: var(--color-text);
  line-height: 1.85;
  flex: 1;
}
.voice-about-card__author {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
}
.voice-about-card__grade {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-text-light);
}
.voice-about-card__stars { color: var(--color-accent); font-size: 0.8rem; display: flex; gap: 2px; }

/* CTA ボタン2つ並び */
.cta-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}
.cta-section .btn--outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.6);
}
.cta-section .btn--outline:hover {
  background: rgba(255,255,255,0.15);
  border-color: #fff;
}

/* =============================
   RESPONSIVE
   ============================= */
@media (max-width: 960px) {
  .about-intro { grid-template-columns: 1fr; gap: 32px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .policy-grid { grid-template-columns: 1fr; }
  .benefits-detail-grid { grid-template-columns: 1fr; }
  .research-grid { grid-template-columns: 1fr; }
  .voices-about-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .benefit-detail-card { flex-direction: column; }
  .benefit-detail-card__icon { width: 48px; height: 48px; }
}