/**
 * UIコンポーネント（ボタン・カード・ナビ・バナー等）
 * おおたピアノ教室
 */

/* ========== ボタン ========== */
.otapiano-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 14px 32px;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  font-weight: 700;
  line-height: 1;
  border-radius: var(--radius-pill);
  border: 1.5px solid transparent;
  text-decoration: none !important;
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: 0.04em;
}

.otapiano-btn:hover,
.otapiano-btn:focus-visible {
  transform: translateY(-2px);
  text-decoration: none !important;
}

.otapiano-btn--primary {
  background: var(--color-cta);
  color: var(--color-white) !important;
  box-shadow: var(--shadow-cta);
}

.otapiano-btn--primary:hover {
  background: var(--color-cta-hover);
  color: var(--color-white) !important;
}

.otapiano-btn--secondary {
  background: transparent;
  color: var(--color-cta) !important;
  border-color: var(--color-cta);
}

.otapiano-btn--secondary:hover {
  background: var(--color-cta);
  color: var(--color-white) !important;
}

.otapiano-btn--white {
  background: var(--color-white);
  color: var(--color-cta) !important;
  border-color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.otapiano-btn--line {
  background: var(--color-line);
  color: var(--color-white) !important;
  border-radius: var(--radius-md);
  border-color: var(--color-line);
}

.otapiano-btn--line:hover {
  background: var(--color-line-hover);
  color: var(--color-white) !important;
}

.otapiano-btn--line::before {
  content: "";
  width: 24px;
  height: 24px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M19 4H5C3.9 4 3 4.9 3 6V18C3 19.1 3.9 20 5 20H9V22L13 20H19C20.1 20 21 19.1 21 18V6C21 4.9 20.1 4 19 4M7 9H17V11H7V9M14 13H7V11H14V13Z'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}

.otapiano-btn--lg {
  padding: 18px 40px;
  font-size: 18px;
}

.otapiano-btn--sm {
  padding: 10px 20px;
  font-size: var(--fs-caption);
}

.otapiano-btn--block {
  display: flex;
  width: 100%;
}

/* ========== カード ========== */
.otapiano-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.otapiano-card:hover,
.otapiano-card.is-link:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.otapiano-card a {
  text-decoration: none;
  color: inherit;
}

.otapiano-card__icon {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-base-light);
  border-radius: var(--radius-pill);
  margin-bottom: var(--space-md);
  font-size: 24px;
  color: var(--color-cta);
}

.otapiano-card__title {
  font-size: var(--fs-h4);
  margin-bottom: var(--space-sm);
}

.otapiano-card__body {
  color: var(--color-text-sub);
  font-size: var(--fs-caption);
  line-height: var(--lh-relaxed);
  flex: 1;
}

.otapiano-card__cta {
  margin-top: var(--space-md);
  font-size: var(--fs-caption);
  font-weight: 700;
  color: var(--color-cta);
}

.otapiano-card__cta::after {
  content: " →";
  display: inline-block;
  transition: transform var(--transition);
}

.otapiano-card:hover .otapiano-card__cta::after {
  transform: translateX(4px);
}

/* ========== お声カード ========== */
.otapiano-voice {
  background: var(--color-base-light);
  border-radius: var(--radius-md);
  padding: var(--space-xl) var(--space-lg);
  border-left: 4px solid var(--color-accent);
  position: relative;
}

.otapiano-voice::before {
  content: "“";
  position: absolute;
  top: 8px;
  left: var(--space-md);
  font-family: var(--font-serif);
  font-size: 64px;
  color: var(--color-accent);
  line-height: 1;
  opacity: 0.4;
}

.otapiano-voice__body {
  font-size: var(--fs-body);
  line-height: var(--lh-relaxed);
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.otapiano-voice__sign {
  text-align: right;
  font-size: var(--fs-caption);
  color: var(--color-text-sub);
}

/* ========== バナー（募集状況） ========== */
.otapiano-banner-status {
  background: var(--color-cta);
  color: var(--color-white);
  padding: var(--space-lg) 0;
  text-align: center;
}

.otapiano-banner-status__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.otapiano-banner-status__text {
  margin: 0;
  font-size: var(--fs-body);
  font-weight: 500;
}

.otapiano-banner-status__text strong {
  color: var(--color-white);
}

@media (max-width: 600px) {
  .otapiano-banner-status__inner {
    flex-direction: column;
    gap: var(--space-md);
  }
}

/* ========== ナビゲーション（PC） ========== */
.otapiano-nav--pc {
  flex: 1;
  display: flex;
  justify-content: center;
}

@media (max-width: 960px) {
  .otapiano-nav--pc {
    display: none;
  }
}

.otapiano-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.otapiano-nav__item {
  position: relative;
}

.otapiano-nav__link,
.otapiano-nav__item > a {
  display: block;
  padding: 12px 4px;
  font-size: var(--fs-caption);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: 0.06em;
  position: relative;
}

.otapiano-nav__link::after,
.otapiano-nav__item > a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transform: translateX(-50%);
  transition: width var(--transition);
}

.otapiano-nav__link:hover::after,
.otapiano-nav__item > a:hover::after,
.otapiano-nav__item.current-menu-item > a::after,
.otapiano-nav__item.current-menu-parent > a::after {
  width: 100%;
}

.otapiano-nav__link:hover,
.otapiano-nav__item > a:hover {
  color: var(--color-cta);
  text-decoration: none;
}

/* ドロップダウン（サブメニュー） */
.otapiano-nav__list .sub-menu {
  position: absolute;
  top: calc(100% - 4px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 200px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-xs);
  box-shadow: var(--shadow-md);
  list-style: none;
  margin: 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition), visibility var(--transition);
  z-index: var(--z-header);
}

.otapiano-nav__item:hover > .sub-menu,
.otapiano-nav__item:focus-within > .sub-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.otapiano-nav__list .sub-menu li a {
  display: block;
  padding: 10px 16px;
  font-size: var(--fs-caption);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.otapiano-nav__list .sub-menu li a:hover {
  background: var(--color-base-light);
  color: var(--color-cta);
  text-decoration: none;
}

/* ========== ハンバーガー・モバイルナビ ========== */
.otapiano-hamburger {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.otapiano-hamburger__line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition), opacity var(--transition);
  border-radius: 2px;
}

.otapiano-hamburger.is-active .otapiano-hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.otapiano-hamburger.is-active .otapiano-hamburger__line:nth-child(2) {
  opacity: 0;
}

.otapiano-hamburger.is-active .otapiano-hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 960px) {
  .otapiano-hamburger {
    display: flex;
  }
}

.otapiano-nav--mobile {
  position: fixed;
  top: var(--header-h-sp);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-base);
  z-index: var(--z-mobile-nav);
  overflow-y: auto;
  padding: var(--space-lg) var(--gutter);
  display: none;
}

.otapiano-nav--mobile[hidden] {
  display: none !important;
}

.otapiano-nav--mobile.is-open {
  display: block !important;
}

.otapiano-nav-mobile__list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.otapiano-nav-mobile__list li {
  border-bottom: 1px solid var(--color-border);
}

.otapiano-nav-mobile__list a {
  display: block;
  padding: 18px 0;
  font-size: var(--fs-body);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
}

.otapiano-nav-mobile__list .sub-menu {
  padding-left: var(--space-md);
  list-style: none;
  margin: 0;
}

.otapiano-nav-mobile__list .sub-menu a {
  font-size: var(--fs-caption);
  font-weight: 400;
  padding: 12px 0;
  color: var(--color-text-sub);
}

.otapiano-nav-mobile__cta {
  margin-top: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

@media (min-width: 961px) {
  .otapiano-nav--mobile {
    display: none !important;
  }
}

/* ========== パンくず ========== */
.otapiano-breadcrumb {
  background: var(--color-base-light);
  padding: var(--space-md) 0;
  font-size: var(--fs-caption);
  color: var(--color-text-sub);
}

.otapiano-breadcrumb a {
  color: var(--color-text-sub);
}

.otapiano-breadcrumb a:hover {
  color: var(--color-cta);
}

.otapiano-breadcrumb__sep {
  margin: 0 var(--space-xs);
  color: var(--color-text-sub);
  opacity: 0.5;
}

/* ========== ページヘッダー ========== */
.otapiano-page-header {
  text-align: center;
  padding: var(--space-3xl) 0 var(--space-2xl);
  background: var(--color-base-light);
  border-bottom: 1px solid var(--color-border);
}

.otapiano-page-header__title {
  margin-bottom: var(--space-sm);
}

.otapiano-page-header__lead {
  font-size: var(--fs-body);
  color: var(--color-text-sub);
  max-width: 640px;
  margin: 0 auto;
}

/* ========== FAQアコーディオン ========== */
.otapiano-faq {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-white);
}

.otapiano-faq + .otapiano-faq {
  margin-top: var(--space-sm);
}

.otapiano-faq__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-base);
  font-size: var(--fs-body);
  font-weight: 700;
  color: var(--color-text);
  text-align: left;
  cursor: pointer;
  transition: background var(--transition);
}

.otapiano-faq__question:hover {
  background: var(--color-base-light);
}

.otapiano-faq__question::before {
  content: "Q.";
  margin-right: var(--space-sm);
  color: var(--color-cta);
  font-family: var(--font-serif);
  font-size: var(--fs-h4);
  flex-shrink: 0;
}

.otapiano-faq__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  position: relative;
  transition: transform var(--transition);
}

.otapiano-faq__icon::before,
.otapiano-faq__icon::after {
  content: "";
  position: absolute;
  background: var(--color-cta);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 1px;
}

.otapiano-faq__icon::before {
  width: 14px;
  height: 2px;
}

.otapiano-faq__icon::after {
  width: 2px;
  height: 14px;
  transition: transform var(--transition);
}

.otapiano-faq.is-open .otapiano-faq__icon::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.otapiano-faq__answer {
  padding: 0 var(--space-lg);
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition), padding var(--transition);
}

.otapiano-faq.is-open .otapiano-faq__answer {
  padding: var(--space-md) var(--space-lg) var(--space-lg);
  max-height: 1200px;
}

.otapiano-faq__answer::before {
  content: "A.";
  display: inline-block;
  margin-right: var(--space-sm);
  color: var(--color-text-sub);
  font-family: var(--font-serif);
  font-size: var(--fs-h4);
}

/* ========== テーブル ========== */
.otapiano-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.otapiano-table th,
.otapiano-table td {
  padding: var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.otapiano-table th {
  background: var(--color-base);
  font-weight: 700;
  color: var(--color-text);
  font-size: var(--fs-caption);
}

.otapiano-table tr:last-child th,
.otapiano-table tr:last-child td {
  border-bottom: none;
}

.otapiano-table--price td {
  font-family: var(--font-num);
  font-size: 18px;
  font-weight: 500;
  color: var(--color-cta);
}

@media (max-width: 600px) {
  .otapiano-table {
    font-size: var(--fs-caption);
  }
  .otapiano-table th,
  .otapiano-table td {
    padding: var(--space-sm);
  }
}

/* ========== ヒーロー ========== */
.otapiano-hero {
  position: relative;
  padding: var(--space-3xl) 0;
  background: linear-gradient(180deg, var(--color-base) 0%, var(--color-base-light) 100%);
  overflow: hidden;
}

.otapiano-hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

@media (max-width: 768px) {
  .otapiano-hero__inner {
    grid-template-columns: 1fr;
  }
}

.otapiano-hero__title {
  font-size: 48px;
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-md);
}

@media (max-width: 768px) {
  .otapiano-hero__title {
    font-size: 32px;
  }
}

.otapiano-hero__lead {
  font-size: var(--fs-body);
  color: var(--color-text-sub);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-xl);
}

.otapiano-hero__ctas {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.otapiano-hero__visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4 / 5;
  background: var(--color-border);
}

.otapiano-hero__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ========== note記事フィード ========== */
.otapiano-note-feed {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

@media (max-width: 600px) {
  .otapiano-note-feed {
    grid-template-columns: 1fr;
  }
}

.otapiano-note-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-decoration: none;
  color: inherit;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.otapiano-note-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: inherit;
}

.otapiano-note-card__date {
  font-size: var(--fs-small);
  color: var(--color-text-sub);
  margin-bottom: var(--space-xs);
  font-family: var(--font-num);
}

.otapiano-note-card__title {
  font-size: var(--fs-h4);
  font-family: var(--font-serif);
  font-weight: 500;
  margin-bottom: var(--space-sm);
  line-height: var(--lh-snug);
}

.otapiano-note-card__excerpt {
  font-size: var(--fs-caption);
  color: var(--color-text-sub);
  flex: 1;
}

/* ========== フェードイン（スクロール） ========== */
.otapiano-fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 600ms cubic-bezier(0.16, 1, 0.3, 1),
              transform 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

.otapiano-fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== 数字装飾（特徴セクション等） ========== */
.otapiano-number {
  font-family: var(--font-num);
  font-size: 56px;
  font-weight: 500;
  color: var(--color-accent);
  line-height: 1;
  display: block;
  margin-bottom: var(--space-md);
}

@media (max-width: 768px) {
  .otapiano-number {
    font-size: 40px;
  }
}