/* ===== 基本設定 ===== */
:root {
  --accent: #3e5c76;        /* スレートブルー */
  --accent-dark: #2c4258;
  --accent-light: #eef3f8;
  --text: #2b2b2b;
  --text-sub: #6b7280;
  --bg: #ffffff;
  --bg-alt: #f7f9fb;
  --border: #e5e9ef;
  --radius: 1rem;
  --shadow: 0 4px 24px rgba(62, 92, 118, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: 'Noto Sans JP', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; }

/* ===== ボタン ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, box-shadow 0.15s, color 0.2s;
}
.btn--primary {
  background: var(--accent);
  color: #fff;
}
.btn--primary:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(62, 92, 118, 0.3);
}
.btn--ghost {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn--ghost:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
}
.btn--lg { padding: 0.95rem 2.2rem; font-size: 1rem; }

/* ===== ヘッダー ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.8rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
}
.logo-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}
.logo-name {
  font-family: 'Zen Old Mincho', serif;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.3;
}
.logo-sub {
  font-size: 0.68rem;
  color: var(--text-sub);
  letter-spacing: 0.08em;
}
.nav { display: flex; align-items: center; gap: 1.2rem; }
.nav-list {
  display: flex;
  gap: 1.4rem;
  list-style: none;
}
.nav-list a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  transition: color 0.2s;
}
.nav-list a:hover { color: var(--accent); }
.btn--nav { font-size: 0.85rem; padding: 0.6rem 1.2rem; }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.4rem;
  color: var(--accent);
  cursor: pointer;
}
.mobile-menu {
  display: none;
  border-top: 1px solid var(--border);
  background: #fff;
}
.mobile-menu.open { display: block; }
.mobile-menu ul { list-style: none; padding: 0.5rem 0; }
.mobile-menu a {
  display: block;
  padding: 0.85rem 1.5rem;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}
.mobile-menu .mobile-apply { color: var(--accent); font-weight: 700; }

/* ===== ヒーロー ===== */
.hero {
  background:
    radial-gradient(ellipse at 80% 20%, rgba(62, 92, 118, 0.12), transparent 55%),
    radial-gradient(ellipse at 10% 90%, rgba(62, 92, 118, 0.08), transparent 50%),
    var(--bg-alt);
  padding: 6.5rem 1.5rem 7rem;
  text-align: center;
}
.hero-inner { max-width: 760px; margin: 0 auto; }
.hero-eyebrow {
  display: inline-block;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.35rem 1.1rem;
  border-radius: 999px;
  margin-bottom: 1.5rem;
}
.hero-title {
  font-family: 'Zen Old Mincho', serif;
  font-size: clamp(2rem, 5.5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 1.4rem;
}
.hero-lead {
  color: var(--text-sub);
  font-size: 1rem;
  margin-bottom: 2.2rem;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== セクション共通 ===== */
.section { padding: 5.5rem 1.5rem; }
.section--alt { background: var(--bg-alt); }
.section-inner { max-width: 1000px; margin: 0 auto; }
.section-inner--narrow { max-width: 760px; }
.section-eyebrow {
  text-align: center;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.section-title {
  font-family: 'Zen Old Mincho', serif;
  text-align: center;
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 700;
  margin-bottom: 1.2rem;
}
.section-lead {
  text-align: center;
  color: var(--text-sub);
  font-size: 0.95rem;
  margin-bottom: 3rem;
}

/* ===== 教室について ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.feature-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.6rem;
  text-align: center;
  box-shadow: var(--shadow);
}
.feature-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1.1rem;
  border-radius: 50%;
  background: var(--accent-light);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}
.feature-card h3 { font-size: 1.05rem; margin-bottom: 0.6rem; }
.feature-card p { font-size: 0.88rem; color: var(--text-sub); }

/* ===== 先生紹介 ===== */
.teacher-wrap {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2.5rem;
  align-items: start;
  margin-top: 2.5rem;
}
.photo-placeholder {
  aspect-ratio: 3 / 4;
  border-radius: var(--radius);
  background: var(--accent-light);
  border: 2px dashed #b9c8d6;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  color: #8aa0b4;
  font-size: 0.85rem;
}
.photo-placeholder i { font-size: 2rem; }
.teacher-name {
  font-family: 'Zen Old Mincho', serif;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}
.teacher-name span {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.8rem;
  color: var(--text-sub);
  font-weight: 400;
  margin-left: 0.6rem;
  letter-spacing: 0.08em;
}
.teacher-history {
  list-style: none;
  margin-bottom: 1.6rem;
}
.teacher-history li {
  position: relative;
  padding: 0.45rem 0 0.45rem 1.4rem;
  font-size: 0.92rem;
  border-bottom: 1px dashed var(--border);
}
.teacher-history li::before {
  content: '♪';
  position: absolute;
  left: 0;
  color: var(--accent);
}
.teacher-message {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.6rem;
  box-shadow: var(--shadow);
}
.teacher-message h4 {
  font-size: 0.92rem;
  color: var(--accent);
  margin-bottom: 0.6rem;
}
.teacher-message p { font-size: 0.92rem; }

/* ===== 料金 ===== */
.price-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.price-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem 1.6rem;
  box-shadow: var(--shadow);
}
.price-card--featured {
  border: 2px solid var(--accent);
  position: relative;
}
.price-tag {
  display: inline-block;
  background: var(--accent-light);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.3rem 0.9rem;
  border-radius: 999px;
  margin-bottom: 0.8rem;
}
.price-card--featured .price-tag { background: var(--accent); color: #fff; }
.price-target { font-size: 0.85rem; color: var(--text-sub); margin-bottom: 0.4rem; }
.price-amount {
  font-size: 1.9rem;
  font-weight: 900;
  color: var(--accent-dark);
  margin-bottom: 1rem;
}
.price-amount span {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-sub);
  margin-left: 0.3rem;
}
.price-card ul { list-style: none; }
.price-card li {
  font-size: 0.87rem;
  padding: 0.35rem 0;
  color: var(--text);
}
.price-card li i { color: var(--accent); margin-right: 0.5rem; font-size: 0.8rem; }
.price-note {
  text-align: center;
  margin-top: 2rem;
  font-size: 0.88rem;
  color: var(--text-sub);
}
.price-note i { color: var(--accent); margin-right: 0.4rem; }

/* ===== FAQ ===== */
.faq-list { display: flex; flex-direction: column; gap: 0.9rem; }
.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  overflow: hidden;
}
.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.05rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary i { color: var(--accent); transition: transform 0.25s; flex-shrink: 0; }
.faq-item[open] summary i { transform: rotate(180deg); }
.faq-item p {
  padding: 0 1.4rem 1.2rem;
  font-size: 0.9rem;
  color: var(--text-sub);
}

/* ===== アクセス ===== */
.access-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 2.2rem;
  box-shadow: var(--shadow);
}
.access-card dl { display: flex; flex-direction: column; gap: 0; }
.access-card dl > div {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px dashed var(--border);
}
.access-card dl > div:last-child { border-bottom: none; }
.access-card dt {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent-dark);
}
.access-card dt i { color: var(--accent); margin-right: 0.45rem; width: 1.1rem; }
.access-card dd { font-size: 0.92rem; }

/* ===== 申し込みフォーム ===== */
.section--apply {
  background: linear-gradient(160deg, var(--accent-dark), var(--accent));
}
.section-eyebrow--light { color: #bcd0e2; }
.section-title--light { color: #fff; }
.section-lead--light { color: rgba(255, 255, 255, 0.8); }

.form-card {
  background: #fff;
  border-radius: 1.2rem;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.18);
  padding: 2.5rem;
}
.form-group { margin-bottom: 1.3rem; }
.form-group label {
  display: block;
  font-size: 0.86rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}
.form-group label span { color: #dc2626; margin-left: 0.2rem; }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.8rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: 0.6rem;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-alt);
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
  outline: none;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(62, 92, 118, 0.12);
  background: #fff;
}
.form-group textarea { resize: vertical; min-height: 130px; }
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.btn--submit { width: 100%; padding: 0.95rem; font-size: 1rem; margin-top: 0.4rem; }
.btn--submit:disabled {
  background: #ccc;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}
.form-note {
  font-size: 0.76rem;
  color: var(--text-sub);
  margin-top: 1rem;
  text-align: center;
}
.form-note i { color: var(--accent); margin-right: 0.3rem; }

.error-msg {
  display: none;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 0.6rem;
  padding: 0.75rem 1rem;
  color: #dc2626;
  font-size: 0.88rem;
  margin-bottom: 1.2rem;
}
.success-msg {
  display: none;
  text-align: center;
  padding: 2rem 1rem;
}
.success-msg .success-icon {
  font-size: 3.2rem;
  color: #16a34a;
  margin-bottom: 1rem;
}
.success-msg h3 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 0.7rem;
}
.success-msg p { color: var(--text-sub); font-size: 0.92rem; }

/* ===== フッター ===== */
.footer {
  background: #1d2935;
  color: #cbd5e1;
  padding: 3rem 1.5rem 2rem;
  text-align: center;
}
.footer-logo {
  font-family: 'Zen Old Mincho', serif;
  font-size: 1.15rem;
  color: #fff;
  margin-bottom: 1.4rem;
}
.footer-logo i { color: #8aa9c4; margin-right: 0.5rem; }
.footer-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.4rem;
  margin-bottom: 1.8rem;
}
.footer-nav a {
  text-decoration: none;
  font-size: 0.85rem;
  color: #cbd5e1;
  transition: color 0.2s;
}
.footer-nav a:hover { color: #fff; }
.footer-copy { font-size: 0.78rem; color: #7d8da0; }

/* ===== レスポンシブ ===== */
@media (max-width: 860px) {
  .nav-list, .btn--nav { display: none; }
  .nav-toggle { display: block; }
  .feature-grid, .price-grid { grid-template-columns: 1fr; }
  .teacher-wrap { grid-template-columns: 1fr; }
  .teacher-photo { max-width: 280px; margin: 0 auto; width: 100%; }
  .access-card dl > div { grid-template-columns: 1fr; gap: 0.2rem; }
  .form-row { grid-template-columns: 1fr; }
  .form-card { padding: 1.75rem 1.3rem; }
  .section { padding: 4rem 1.25rem; }
  .hero { padding: 4.5rem 1.25rem 5rem; }
  .hero-title { font-size: clamp(1.55rem, 7vw, 2.2rem); }
}