/* ==========================================================================
   オンライン講座ページ専用スタイル
   common.css の CSS変数を前提とする
   ========================================================================== */

/* --------------------------------------------------------------------------
   セクション共通タイトル
   -------------------------------------------------------------------------- */
.online-section-title {
  font-size: clamp(1.25rem, 3vw, 1.7rem);
  font-weight: 700;
  color: var(--color-ink);
  text-align: center;
  letter-spacing: 0.04em;
  margin-bottom: clamp(2rem, 4vw, 3rem);
  padding-bottom: 1rem;
  position: relative;
}

.online-section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 3px;
  background-color: var(--color-apricot);
  border-radius: 2px;
}

/* section-en（common.css 未収録のためここで定義） */
.section-en {
  display: block;
  text-align: center;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-apricot);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.section-en--light {
  color: rgba(255, 255, 255, 0.65);
}

/* --------------------------------------------------------------------------
   ボタン（front-page.css 未読み込みページでも使えるよう定義）
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: var(--radius-md);
  transition:
    background-color var(--transition),
    color var(--transition),
    transform var(--transition),
    box-shadow var(--transition);
  white-space: nowrap;
  text-decoration: none;
  cursor: pointer;
}

.btn--apricot {
  background-color: var(--color-apricot);
  color: #fff;
}
.btn--apricot:hover {
  background-color: var(--color-apricot-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(200, 98, 58, 0.38);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-apricot);
  border: 2px solid var(--color-apricot);
}
.btn--ghost:hover {
  background-color: var(--color-apricot);
  color: #fff;
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   1. ページヒーロー
   -------------------------------------------------------------------------- */
.page-hero {
  background-color: var(--color-apricot);
  padding-block: 3.5rem 3rem;
  text-align: center;
}

/* オンライン講座ページのヒーローは深みある色+グラデーション */
.page-hero--online {
  position: relative;
  overflow: hidden;
  background: linear-gradient(
    135deg,
    var(--color-apricot-dark) 0%,
    var(--color-apricot) 50%,
    #d97a50 100%
  );
  padding-block: 4.5rem 4rem;
}

/* 背景の墨流し的な装飾（疑似要素） */
.page-hero--online::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 80% 120%, rgba(255,255,255,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 10% -10%, rgba(255,255,255,0.04) 0%, transparent 50%);
  pointer-events: none;
}

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

.page-hero__en {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: rgba(255, 255, 255, 0.65);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.page-hero__title {
  font-size: clamp(1.8rem, 4.5vw, 2.8rem);
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.1em;
  line-height: 1.3;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
  margin-bottom: 0.75rem;
}

.page-hero__sub {
  font-size: clamp(0.88rem, 2vw, 1rem);
  color: rgba(255, 255, 255, 0.82);
  letter-spacing: 0.06em;
}

/* --------------------------------------------------------------------------
   2. 導入セクション ― こんな方に
   -------------------------------------------------------------------------- */
.online-lead {
  padding-block: var(--section-padding);
  background-color: var(--color-bg);
}

.online-lead__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

@media (min-width: 768px) {
  .online-lead__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.online-lead__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
  padding: 1.75rem 1rem;
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
}

.online-lead__icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: var(--color-apricot-pale);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-apricot);
  flex-shrink: 0;
}

.online-lead__card p {
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--color-ink-mid);
  text-wrap: pretty;
}

.online-lead__message {
  text-align: center;
  font-size: clamp(0.9rem, 2vw, 1.05rem);
  line-height: 2;
  color: var(--color-ink-mid);
  padding: 1.75rem 2rem;
  background-color: var(--color-apricot-pale);
  border-radius: var(--radius-md);
  width: 100%;
  max-width: 100%;
  margin: 0;
  box-shadow: var(--shadow-md);
}

.online-lead__message strong {
  color: var(--color-apricot-dark);
}

/* --------------------------------------------------------------------------
   3. 3つの特長
   -------------------------------------------------------------------------- */
.online-features {
  position: relative;
  overflow: hidden;
}

/* パララックス背景 */
.online-features .parallax-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  z-index: 0;
}

@media (prefers-reduced-motion: reduce) {
  .online-features .parallax-bg {
    background-attachment: scroll;
  }
}

/* 暗めオーバーレイ */
.online-features__overlay {
  position: absolute;
  inset: 0;
  background: rgba(45, 37, 32, 0.62);
  z-index: 1;
}

/* コンテンツ */
.online-features__content {
  position: relative;
  z-index: 2;
  padding-block: var(--section-padding);
}

/* 白抜きタイトル */
.online-section-title--light {
  color: #fff;
}

.online-section-title--light::after {
  background-color: rgba(255, 255, 255, 0.6);
}

.online-features__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 700px) {
  .online-features__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.online-feature-card {
  position: relative;
  padding: 2.5rem 1.75rem 2rem;
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.online-feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.online-feature-card__num {
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-apricot-light);
  line-height: 1;
  letter-spacing: 0;
}

.online-feature-card__icon {
  width: 68px;
  height: 68px;
  border-radius: 50%;
  background-color: var(--color-apricot-pale);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-apricot);
  margin-bottom: 1.25rem;
}

.online-feature-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
}

.online-feature-card__text {
  font-size: 0.9rem;
  line-height: 1.95;
  color: var(--color-ink-mid);
}

/* --------------------------------------------------------------------------
   4. コース一覧
   -------------------------------------------------------------------------- */
.online-courses {
  padding-block: var(--section-padding);
  background-color: var(--color-bg);
}

.online-courses__lead {
  text-align: center;
  font-size: 0.92rem;
  line-height: 1.9;
  color: var(--color-ink-mid);
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: 2.5rem;
}

.online-courses__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 700px) {
  .online-courses__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.online-course-card {
  padding: 0;
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
}

.online-course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* 注目カード（一般書道コース） */
.online-course-card--featured {
  border-color: var(--color-apricot);
  box-shadow: 0 0 0 2px var(--color-apricot-light), var(--shadow-sm);
}

.online-course-card__header {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.5rem 1.5rem 1.25rem;
  background-color: var(--color-bg-pale);
  border-bottom: 1px solid var(--color-border-light);
}

.online-course-card--featured .online-course-card__header {
  background-color: var(--color-apricot-pale);
}

.online-course-card__num {
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--color-apricot-light);
  line-height: 1;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.online-course-card--featured .online-course-card__num {
  color: var(--color-apricot);
}

.online-course-card__tag {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}

.online-course-card__tag--accent {
  color: var(--color-apricot);
}

.online-course-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0.04em;
}

.online-course-card__text {
  padding: 1.25rem 1.5rem 0.75rem;
  font-size: 0.88rem;
  line-height: 1.95;
  color: var(--color-ink-mid);
  flex: 1;
}

.online-course-card__points {
  padding: 0 1.5rem 1.5rem;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.online-course-card__points li {
  font-size: 0.82rem;
  color: var(--color-ink-mid);
  padding-left: 1.1rem;
  position: relative;
}

.online-course-card__points li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-apricot);
  font-size: 0.78rem;
  font-weight: 700;
}

/* --------------------------------------------------------------------------
   5. パララックス ― メッセージ
   -------------------------------------------------------------------------- */
.online-parallax {
  position: relative;
  overflow: hidden;
  min-height: 480px;
  display: flex;
  align-items: center;
}

/* parallax-bg は front-page.css に定義済みだが、
   オンラインページ単体でも動くよう再定義 */
.online-parallax .parallax-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  z-index: 0;
}

@media (prefers-reduced-motion: reduce) {
  .online-parallax .parallax-bg {
    background-attachment: scroll;
  }
}

.online-parallax__overlay {
  position: absolute;
  inset: 0;
  background: rgba(45, 37, 32, 0.72);
  z-index: 1;
}

.online-parallax__content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding-block: var(--section-padding);
}

.online-parallax__title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.08em;
  line-height: 1.5;
  margin-bottom: 1.75rem;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.online-parallax__body {
  font-size: clamp(0.9rem, 1.8vw, 1.05rem);
  color: rgba(255, 255, 255, 0.84);
  line-height: 2.2;
  letter-spacing: 0.04em;
}

/* 大きな装飾文字 */
.online-parallax__deco {
  font-size: clamp(5rem, 14vw, 12rem);
  font-weight: 700;
  color: rgba(255, 255, 255, 0.04);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  letter-spacing: 0;
  z-index: 1;
  white-space: nowrap;
  line-height: 1;
}

/* --------------------------------------------------------------------------
   6. 受講の流れ
   -------------------------------------------------------------------------- */
.online-flow {
  padding-block: var(--section-padding);
  background-color: var(--color-bg-pale);
}

.online-flow__list {
  list-style: none;
  max-width: 720px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.online-flow__item {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--color-border-light);
  position: relative;
}

.online-flow__item:last-child {
  border-bottom: none;
}

/* ステップ番号ラベル */
.online-flow__step {
  flex-shrink: 0;
  min-width: 72px;
  padding: 0.35rem 0.6rem;
  background-color: var(--color-apricot);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  border-radius: var(--radius-sm);
  text-align: center;
  margin-top: 0.2rem;
}

.online-flow__title {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0.04em;
  margin-bottom: 0.4rem;
}

.online-flow__text {
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--color-ink-mid);
}

/* --------------------------------------------------------------------------
   7. 料金
   -------------------------------------------------------------------------- */
.online-price {
  padding-block: var(--section-padding);
  background-color: var(--color-bg);
}

.online-price__table-wrap {
  overflow-x: auto;
  margin-bottom: 1.75rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.online-price__table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-white);
  font-size: 1rem;
}

.online-price__table thead tr {
  background-color: var(--color-apricot);
}

.online-price__table th {
  padding: 0.9rem 1.5rem;
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-align: left;
  font-size: 0.95rem;
}

.online-price__table tbody tr {
  border-bottom: 1px solid var(--color-border-light);
  transition: background-color var(--transition);
}

.online-price__table tbody tr:last-child {
  border-bottom: none;
}

.online-price__table tbody tr:hover {
  background-color: var(--color-apricot-pale);
}

.online-price__table td {
  padding: 1rem 1.5rem;
  color: var(--color-ink);
  line-height: 1.7;
}

.online-price__table td:first-child {
  font-weight: 700;
  color: var(--color-ink);
  white-space: nowrap;
}

/* 入会金 キャンペーン表示 */
.price-original {
  text-decoration: line-through;
  color: var(--color-ink-muted);
  font-size: 0.95rem;
}

.price-arrow {
  margin-inline: 0.3rem;
  color: var(--color-ink-muted);
}

.price-campaign {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-apricot);
}

.price-label {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.2rem 0.6rem;
  background-color: var(--color-apricot);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  border-radius: 20px;
  vertical-align: middle;
}

.price-unit {
  font-size: 0.9rem;
  color: var(--color-ink-muted);
}

/* 注記リスト */
.online-price__notes {
  list-style: none;
  max-width: 560px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.online-price__notes li {
  font-size: 0.92rem;
  color: var(--color-ink-muted);
  padding-left: 1.1rem;
  position: relative;
  line-height: 1.7;
}

.online-price__notes li::before {
  content: '※';
  position: absolute;
  left: 0;
  font-size: 0.78rem;
}

/* --------------------------------------------------------------------------
   8. FAQ
   -------------------------------------------------------------------------- */
.online-faq {
  padding-block: var(--section-padding);
  background-color: var(--color-bg-pale);
}

.faq-list {
  max-width: 760px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1.2rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0.03em;
  line-height: 1.65;
  cursor: default;
  border-bottom: 1px solid var(--color-border-light);
  background-color: var(--color-apricot-pale);
}

.faq-item__icon {
  flex-shrink: 0;
  color: var(--color-apricot);
  margin-top: 0.05rem;
}

.faq-item__a {
  padding: 1.2rem 1.5rem 1.2rem calc(1.5rem + 20px + 0.75rem);
  font-size: 0.9rem;
  line-height: 1.95;
  color: var(--color-ink-mid);
}

/* --------------------------------------------------------------------------
   9. CTA
   -------------------------------------------------------------------------- */
.online-cta {
  padding-block: var(--section-padding);
  background-color: var(--color-bg);
  text-align: center;
}

.online-cta__title {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
}

.online-cta__body {
  font-size: 0.95rem;
  line-height: 2;
  color: var(--color-ink-mid);
  margin-bottom: 2rem;
}

.online-cta__buttons {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

@media (min-width: 480px) {
  .online-cta__buttons {
    flex-direction: row;
    justify-content: center;
  }
}