/* ============================================
   taichi TOP Page
   ============================================ */

:root {
  /* ── 背景色 ─────────────────────────── */
  --bg:          #faf8f4;
  --bg-section:  #f3efe8;
  --bg-dark:     #1e1c18;

  /* ── ブランドカラー ──────────────────── */
  --accent:       #8b6535;
  --accent-light: #c4a06a;
  --gold:         #c8963c;
  --border:       #e2dbd0;
  --white:        #ffffff;
  --line-green:   #06c755;

  /* ── 明背景テキスト ──────────────────── */
  --text:       #26221c;   /* 見出し・主要テキスト */
  --text-sub:   #3d3730;   /* サブテキスト */
  --text-muted: #5a5248;   /* 補足テキスト（旧 #7a756e より高コントラスト） */

  /* ── 暗背景テキスト（5段階）────────── */
  --on-dark-1: rgba(255,255,255,0.96);  /* 見出し */
  --on-dark-2: rgba(255,255,255,0.85);  /* ナビ・サブタイトル */
  --on-dark-3: rgba(255,255,255,0.72);  /* 本文 */
  --on-dark-4: rgba(255,255,255,0.52);  /* キャプション・ラベル */
  --on-dark-5: rgba(255,255,255,0.32);  /* 装飾 */

  /* ── UI状態 ──────────────────────────── */
  --on-dark-border:    rgba(255,255,255,0.28);
  --on-dark-border-focus: rgba(255,255,255,0.60);
  --on-dark-hover-bg:  rgba(255,255,255,0.10);
  --on-dark-input-bg:  rgba(255,255,255,0.07);
  --overlay:           rgba(0,0,0,0.55);
  --overlay-dark:      rgba(0,0,0,0.65);
  --header-scrolled-bg: rgba(250,248,244,0.96);

  /* ── ヒーロー画像（ここを変えるだけで差し替え可） */
  --hero-image:   url('/static/images/hero.jpg');
  --hero-overlay: linear-gradient(150deg, rgba(20,18,14,0.50) 0%, rgba(20,18,14,0.18) 100%);

  /* ── フォント ────────────────────────── */
  --font-serif-jp: 'Shippori Mincho', 'YuMincho', '游明朝', serif;
  --font-serif-en: 'Cormorant Garamond', Georgia, serif;
  --font-sans:     'Noto Sans JP', sans-serif;

  /* ── レイアウト ──────────────────────── */
  --header-h:  72px;
  --container: 1160px;
}

/* ============================================
   ベース
   ============================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-weight: 300;
  line-height: 1.8;
  overflow-x: hidden;
}
img { display: block; width: 100%; height: 100%; object-fit: cover; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
}
.is-hidden { display: none !important; }

/* ============================================
   ローダー
   ============================================ */
.loader {
  position: fixed;
  inset: 0;
  background: var(--bg-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.8s ease, visibility 0.8s ease;
}
.loader.hidden { opacity: 0; visibility: hidden; }
.loader-char {
  font-family: var(--font-serif-jp);
  font-size: clamp(24px, 5vw, 42px);
  color: var(--white);
  letter-spacing: 0.25em;
  animation: loaderFade 1.6s ease forwards;
}
@keyframes loaderFade {
  0%   { opacity: 0; transform: scale(0.85) translateY(10px); }
  40%  { opacity: 1; transform: scale(1) translateY(0); }
  100% { opacity: 1; transform: scale(1) translateY(0); }
}

/* ============================================
   ヘッダー
   ============================================ */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 1000;
  transition: background 0.5s, box-shadow 0.5s, border-color 0.5s;
}
.header.scrolled {
  background: var(--header-scrolled-bg);
  box-shadow: 0 1px 24px rgba(0,0,0,0.07);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 40px;
}

.header-logo {
  display: flex;
  align-items: baseline;
  gap: 10px;
  transition: opacity 0.3s;
}
.header-logo:hover { opacity: 0.7; }
.logo-jp {
  font-family: var(--font-serif-jp);
  font-size: 22px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.1em;
  transition: color 0.5s;
}
.logo-en {
  font-family: var(--font-serif-en);
  font-size: 12px;
  letter-spacing: 0.35em;
  color: var(--on-dark-4);
  transition: color 0.5s;
}
.header.scrolled .logo-jp { color: var(--accent); }
.header.scrolled .logo-en { color: var(--text-muted); }

.nav-list {
  display: flex;
  align-items: center;
  gap: 36px;
}
.nav-list a {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--on-dark-2);
  transition: color 0.3s;
  font-weight: 400;
  position: relative;
}
.nav-list a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 1px;
  background: currentColor;
  transition: width 0.3s;
}
.nav-list a:hover::after { width: 100%; }
.nav-list a:hover { color: var(--white); }
.header.scrolled .nav-list a { color: var(--text-muted); }
.header.scrolled .nav-list a:hover { color: var(--accent); }

.nav-btn {
  border: 1px solid var(--on-dark-border) !important;
  padding: 9px 22px !important;
  border-radius: 1px;
  transition: background 0.3s, border-color 0.3s, color 0.3s !important;
}
.nav-btn::after { display: none !important; }
.nav-btn:hover { background: var(--on-dark-hover-bg) !important; }
.header.scrolled .nav-btn { border-color: var(--accent) !important; color: var(--accent) !important; }
.header.scrolled .nav-btn:hover { background: var(--accent) !important; color: var(--white) !important; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1100;
}
.hamburger span {
  display: block;
  width: 26px;
  height: 1px;
  background: var(--white);
  transition: transform 0.35s, opacity 0.35s, background 0.5s;
}
.header.scrolled .hamburger span { background: var(--text); }
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  position: fixed;
  top: 0; right: -100%;
  width: min(320px, 80vw);
  height: 100%;
  background: var(--bg-dark);
  z-index: 1050;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: right 0.45s cubic-bezier(0.4,0,0.2,1);
}
.mobile-menu.open { right: 0; }
.mobile-menu ul { text-align: center; }
.mobile-menu li { margin: 28px 0; }
.mobile-menu a {
  font-family: var(--font-serif-jp);
  font-size: 20px;
  color: var(--white);
  letter-spacing: 0.15em;
  transition: color 0.3s;
}
.mobile-menu a:hover { color: var(--accent-light); }

.menu-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  z-index: 1040;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.45s, visibility 0.45s;
}
.menu-overlay.open { opacity: 1; visibility: visible; }

/* ---- デスクトップ ユーザーエリア ---- */
.nav-user {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: 8px;
}
.nav-user-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--on-dark-2);
  border: 1px solid var(--on-dark-border);
  padding: 8px 16px;
  border-radius: 2px;
  transition: background 0.3s, color 0.3s, border-color 0.3s;
  white-space: nowrap;
}
.nav-user-btn svg { flex-shrink: 0; }
.nav-user-btn:hover {
  background: var(--on-dark-hover-bg);
  color: var(--white);
}
.nav-user-btn::after { display: none !important; }
.header.scrolled .nav-user-btn {
  color: var(--text-muted);
  border-color: var(--border);
}
.header.scrolled .nav-user-btn:hover {
  background: var(--accent);
  color: var(--white);
  border-color: var(--accent);
}
.nav-logout {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--on-dark-3);
  transition: color 0.3s;
  white-space: nowrap;
}
.nav-logout::after { display: none !important; }
.nav-logout:hover { color: var(--on-dark-1); }
.header.scrolled .nav-logout { color: var(--text-muted); }
.header.scrolled .nav-logout:hover { color: var(--accent); }

/* ---- モバイルメニュー ユーザーエリア ---- */
.mobile-menu-user {
  position: absolute;
  bottom: 66px;
  left: 0; right: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 0 24px;
}
.mobile-user-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 14px 20px;
  border-radius: 3px;
  font-family: var(--font-sans);
  font-size: 15px;
  letter-spacing: 0.08em;
  background: rgba(255,255,255,0.12);
  color: var(--white) !important;
  transition: background 0.3s;
}
.mobile-user-btn:hover { background: rgba(255,255,255,0.22) !important; color: var(--white) !important; }
.mobile-user-btn--line {
  background: var(--line-green) !important;
}
.mobile-user-btn--line:hover { background: #05b04c !important; }
.mobile-logout-btn {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--on-dark-3);
  transition: color 0.3s;
}
.mobile-logout-btn:hover { color: var(--on-dark-1); }

/* ============================================
   ヒーロー
   ============================================ */
.hero {
  position: relative;
  height: 100svh;
  min-height: 600px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-bg {
  position: absolute;
  inset: -12%;
  background-color: var(--bg-dark);
  background-image: var(--hero-image);
  background-size: cover;
  background-position: center top;
  will-change: transform;
}
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--hero-overlay);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--white);
  padding: 0 24px;
  max-width: 860px;
}
.hero-deco-line {
  width: 1px;
  height: 64px;
  background: var(--on-dark-border);
  margin: 0 auto 28px;
  transform-origin: top;
  animation: lineGrow 1.4s ease forwards;
}
@keyframes lineGrow {
  from { transform: scaleY(0); }
  to   { transform: scaleY(1); }
}
.hero-sub-en {
  font-family: var(--font-serif-en);
  font-size: clamp(11px, 1.4vw, 14px);
  letter-spacing: 0.28em;
  color: var(--on-dark-4);
  margin-bottom: 32px;
  animation: fadeUp 1s ease 0.3s both;
}
.hero-title { margin-bottom: 24px; }
.hero-title-jp {
  display: block;
  font-family: var(--font-serif-jp);
  font-size: clamp(28px, 5.5vw, 62px);
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.6;
  color: var(--on-dark-1);
  animation: fadeUp 1s ease 0.55s both;
}
.hero-title-en {
  display: block;
  font-family: var(--font-serif-en);
  font-size: clamp(12px, 1.6vw, 16px);
  font-weight: 300;
  letter-spacing: 0.55em;
  color: var(--on-dark-4);
  margin-top: 18px;
  animation: fadeUp 1s ease 0.8s both;
}
.hero-desc {
  font-family: var(--font-serif-jp);
  font-size: clamp(14px, 1.8vw, 18px);
  font-weight: 400;
  color: var(--on-dark-3);
  letter-spacing: 0.22em;
  margin-top: 16px;
  animation: fadeUp 1s ease 1s both;
}
.hero-scroll {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  margin-top: 64px;
  animation: fadeUp 1s ease 1.3s both;
}
.scroll-label {
  font-family: var(--font-serif-en);
  font-size: 10px;
  letter-spacing: 0.4em;
  color: var(--on-dark-4);
}
.scroll-line {
  display: block;
  width: 1px;
  height: 52px;
  background: linear-gradient(to bottom, var(--on-dark-border), transparent);
  animation: scrollDrop 2.2s ease-in-out infinite;
}
@keyframes scrollDrop {
  0%   { transform: scaleY(0) translateY(-100%); opacity: 1; }
  50%  { transform: scaleY(1) translateY(0); opacity: 1; }
  100% { transform: scaleY(1) translateY(0); opacity: 0; }
}

.hero-vertical-text {
  position: absolute;
  right: 44px;
  top: 50%;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  font-family: var(--font-serif-jp);
  font-size: 11px;
  letter-spacing: 0.35em;
  color: var(--on-dark-5);
  z-index: 2;
  animation: fadeUp 1.2s ease 1.1s both;
}

/* ============================================
   共通パーツ
   ============================================ */
.section-label {
  font-family: var(--font-serif-en);
  font-size: 11px;
  letter-spacing: 0.45em;
  color: var(--accent);
  margin-bottom: 16px;
  display: block;
}
.section-label.light { color: var(--on-dark-4); }

.section-title-jp {
  font-family: var(--font-serif-jp);
  font-size: clamp(24px, 3.8vw, 42px);
  font-weight: 600;
  line-height: 1.55;
  letter-spacing: 0.06em;
  color: var(--text);
}

.section-line {
  width: 40px;
  height: 1px;
  background: var(--accent);
  margin: 22px 0 36px;
}
.section-line.center { margin: 22px auto 36px; }

.section-head { text-align: center; margin-bottom: 64px; }

.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}
.reveal.reveal-right  { transform: translateX(36px); }
.reveal.reveal-left   { transform: translateX(-36px); }
.reveal.visible { opacity: 1; transform: translate(0,0); }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================
   コンセプト
   ============================================ */
.concept {
  padding: 128px 0;
  background: var(--bg);
}
.concept-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 88px;
  align-items: center;
}
.concept-body {
  font-size: 15px;
  line-height: 2.15;
  color: var(--text-muted);
  margin-bottom: 36px;
}
.btn-text {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif-en);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--accent);
  border-bottom: 1px solid var(--accent);
  padding-bottom: 4px;
  transition: gap 0.35s, opacity 0.3s;
}
.btn-text:hover { gap: 18px; opacity: 0.7; }

.concept-image { position: relative; }
.concept-img-wrap {
  position: relative;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background: var(--bg-section);
}
.concept-img-wrap img { transition: transform 0.7s ease; }
.concept-img-wrap:hover img { transform: scale(1.05); }

.concept-img-deco {
  position: absolute;
  top: -22px;
  right: -22px;
  width: 55%;
  height: 55%;
  border: 1px solid var(--border);
  z-index: -1;
  pointer-events: none;
}

/* ============================================
   サービス
   ============================================ */
.services {
  padding: 128px 0;
  background: var(--bg-section);
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.service-card {
  background: var(--white);
  overflow: hidden;
  transition: transform 0.45s ease, box-shadow 0.45s ease;
}
.service-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 24px 64px rgba(0,0,0,0.11);
}
.card-img {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--bg-section);
}
.card-img img { transition: transform 0.65s ease; }
.service-card:hover .card-img img { transform: scale(1.07); }

.card-body { padding: 28px 28px 32px; }
.card-label {
  font-family: var(--font-serif-en);
  font-size: 10px;
  letter-spacing: 0.45em;
  color: var(--accent);
  margin-bottom: 10px;
}
.card-title {
  font-family: var(--font-serif-jp);
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 14px;
  letter-spacing: 0.06em;
}
.card-text {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.95;
}

/* ============================================
   フィーチャー
   ============================================ */
.feature { overflow: hidden; }
.feature-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 560px;
}
.feature-inner.reverse .feature-image { order: 2; }
.feature-inner.reverse .feature-text  { order: 1; }

.feature-image {
  overflow: hidden;
  background: var(--bg-dark);
}
.feature-image img { transition: transform 0.65s ease; }
.feature-image:hover img { transform: scale(1.05); }

.feature-text {
  padding: 80px 64px;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.feature-inner.reverse .feature-text { background: var(--bg-section); }
.feature-text p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 2.15;
}

/* ============================================
   書籍紹介
   ============================================ */
.book-section {
  padding: 128px 0;
  background: var(--bg);
}
.book-inner {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 80px;
  align-items: center;
}
.book-cover {
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background: var(--bg-dark);
  box-shadow: 0 24px 64px rgba(0,0,0,0.18);
}
.book-cover img { transition: transform 0.7s ease; }
.book-cover:hover img { transform: scale(1.03); }

.book-title {
  font-family: var(--font-serif-jp);
  font-size: clamp(20px, 3vw, 32px);
  font-weight: 600;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--text);
  margin-bottom: 10px;
}
.book-author {
  font-family: var(--font-serif-en);
  font-size: 13px;
  letter-spacing: 0.25em;
  color: var(--text-muted);
  margin-bottom: 28px;
}
.book-body {
  font-size: 15px;
  line-height: 2.1;
  color: var(--text-muted);
  margin-bottom: 36px;
}

/* ============================================
   LINE 公式登録セクション
   ============================================ */
.members-section {
  background: var(--bg-dark);
  padding: 112px 0;
  position: relative;
  overflow: hidden;
}
.members-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(139,101,53,0.14) 0%, transparent 65%);
  pointer-events: none;
}
.members-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}
.members-label { color: var(--accent-light) !important; }
.members-heading {
  color: var(--on-dark-1) !important;
  margin-bottom: 40px;
}
.members-benefits {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.members-benefit-item {
  display: flex;
  gap: 18px;
  align-items: flex-start;
}
.members-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.members-benefit-title {
  font-family: var(--font-serif-jp);
  font-size: 16px;
  font-weight: 600;
  color: var(--on-dark-1);
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.members-benefit-body {
  font-size: 13.5px;
  color: var(--on-dark-3);
  line-height: 1.85;
}
.members-card {
  background: var(--white);
  padding: 40px 40px 44px;
  box-shadow: 0 24px 80px rgba(0,0,0,0.3);
}
.members-card-heading {
  font-family: var(--font-serif-jp);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}
.members-card-sub {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 28px;
}
.members-btn-brand {
  display: block;
  width: 100%;
  padding: 16px;
  background: var(--accent);
  color: var(--white);
  font-family: var(--font-serif-jp);
  font-size: 15px;
  letter-spacing: 0.14em;
  text-align: center;
  text-decoration: none;
  transition: opacity 0.3s;
  margin-bottom: 12px;
}
.members-btn-brand:hover { opacity: 0.82; }
.members-btn-line {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 16px;
  background: var(--line-green);
  color: var(--white);
  font-family: var(--font-serif-jp);
  font-size: 15px;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: opacity 0.3s;
  margin-bottom: 14px;
}
.members-btn-line:hover { opacity: 0.82; }
.members-card-note {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  letter-spacing: 0.06em;
}

/* ============================================
   CTA・お問い合わせ
   ============================================ */
.cta {
  background: var(--bg-dark);
  padding: 128px 40px;
  text-align: center;
}
.cta-title {
  font-family: var(--font-serif-jp);
  font-size: clamp(26px, 4.5vw, 50px);
  font-weight: 600;
  color: var(--on-dark-1);
  line-height: 1.6;
  letter-spacing: 0.12em;
  margin-bottom: 28px;
}
.cta-text {
  color: var(--on-dark-3);
  font-size: 15px;
  line-height: 2.1;
  margin-bottom: 52px;
}
.btn-primary {
  display: inline-block;
  padding: 18px 60px;
  background: transparent;
  border: 1px solid var(--on-dark-border);
  color: var(--white);
  font-family: var(--font-serif-jp);
  font-size: 16px;
  letter-spacing: 0.22em;
  position: relative;
  overflow: hidden;
  transition: color 0.4s, border-color 0.4s;
  cursor: pointer;
}
.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}
.btn-primary:hover { border-color: var(--accent); }
.btn-primary:hover::before { transform: scaleX(1); }
.btn-primary span { position: relative; z-index: 1; }

.contact-card {
  max-width: 560px;
  margin: 0 auto;
  text-align: left;
}
.contact-label {
  display: block;
  font-size: 13px;
  color: var(--on-dark-3);
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}
.contact-label .req {
  color: var(--accent-light);
  margin-left: 4px;
}
.contact-textarea {
  width: 100%;
  min-height: 140px;
  padding: 16px;
  background: var(--on-dark-input-bg);
  border: 1px solid var(--on-dark-border);
  border-radius: 2px;
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.8;
  resize: vertical;
  transition: border-color 0.3s;
  margin-bottom: 20px;
}
.contact-textarea::placeholder { color: var(--on-dark-5); }
.contact-textarea:focus {
  outline: none;
  border-color: var(--on-dark-border-focus);
}
.contact-submit-btn {
  width: 100%;
  cursor: pointer;
}
.contact-error {
  background: rgba(200,60,60,0.2);
  border: 1px solid rgba(200,60,60,0.5);
  color: #ffaaaa;
  font-size: 13px;
  padding: 12px 16px;
  border-radius: 2px;
  margin-bottom: 16px;
}
.contact-sent {
  text-align: center;
  padding: 48px 24px;
}
.contact-check {
  width: 56px;
  height: 56px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}
.contact-sent-title {
  font-family: var(--font-serif-jp);
  font-size: 22px;
  color: var(--on-dark-1);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}
.contact-sent-body {
  color: var(--on-dark-3);
  font-size: 14px;
  line-height: 1.9;
}
.contact-login-text {
  color: var(--on-dark-3);
  font-size: 15px;
  line-height: 2;
  text-align: center;
  margin-bottom: 28px;
}
.btn-line-login {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 16px 40px;
  background: var(--line-green);
  color: var(--white);
  font-family: var(--font-serif-jp);
  font-size: 15px;
  letter-spacing: 0.1em;
  border-radius: 2px;
  transition: opacity 0.3s;
}
.btn-line-login:hover { opacity: 0.85; }

/* ============================================
   フッター
   ============================================ */
.footer {
  background: var(--bg-dark);
  padding: 64px 40px;
  border-top: 1px solid var(--on-dark-5);
}
.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}
.footer-logo {
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.footer-logo .logo-jp {
  font-family: var(--font-serif-jp);
  font-size: 22px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.1em;
}
.footer-logo .logo-en {
  font-family: var(--font-serif-en);
  font-size: 13px;
  letter-spacing: 0.4em;
  color: var(--on-dark-5);
}
.footer-nav {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
  justify-content: center;
}
.footer-nav a {
  font-size: 13px;
  color: var(--on-dark-4);
  letter-spacing: 0.1em;
  transition: color 0.3s;
}
.footer-nav a:hover { color: var(--white); }
.footer-social {
  display: flex;
  gap: 20px;
  margin-top: 20px;
  align-items: center;
}
.footer-social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--on-dark-4);
  transition: color 0.3s;
}
.footer-social-btn:hover { color: var(--accent-light); }

.footer-copy {
  font-family: var(--font-serif-en);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--on-dark-5);
  margin-top: 16px;
}

/* ---- モバイルメニュー SNS ---- */
.mobile-sns-links {
  position: absolute;
  bottom: 18px;
  left: 0; right: 0;
  display: flex;
  justify-content: center;
  gap: 0.75rem;
}
.mobile-sns-links .mobile-sns-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1rem;
  border-radius: 9999px;
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  white-space: nowrap;
  transition: opacity 0.2s;
}
.mobile-sns-links .mobile-sns-btn:hover { opacity: 0.82; color: var(--white); }
.mobile-sns-links .mobile-sns-btn--instagram {
  background: linear-gradient(135deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
}
.mobile-sns-links .mobile-sns-btn--line-official { background: var(--line-green); }

/* ============================================
   モーダル
   ============================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-dark);
  z-index: 9000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s, visibility 0.35s;
}
.modal-overlay.show { opacity: 1; visibility: visible; }
.modal-box {
  background: var(--bg);
  padding: 56px 48px;
  max-width: 400px;
  width: 90%;
  text-align: center;
}
.modal-title {
  font-family: var(--font-serif-jp);
  font-size: 22px;
  color: var(--text);
  margin-bottom: 14px;
  letter-spacing: 0.08em;
}
.modal-body {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.9;
  margin-bottom: 32px;
}
.modal-close-btn {
  padding: 12px 40px;
  background: var(--accent);
  color: var(--white);
  border: none;
  font-family: var(--font-serif-jp);
  font-size: 14px;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: opacity 0.3s;
}
.modal-close-btn:hover { opacity: 0.8; }

/* ============================================
   レスポンシブ
   ============================================ */
@media (max-width: 1024px) {
  .concept-inner { gap: 56px; }
  .feature-text { padding: 64px 48px; }
  .nav-list { gap: 24px; }
  .book-inner { grid-template-columns: 240px 1fr; gap: 56px; }
}

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .header-inner { padding: 0 20px; }
  .header-nav { display: none; }
  .hamburger  { display: flex; }
  .hero-vertical-text { display: none; }

  .concept { padding: 80px 0; }
  .concept-inner { grid-template-columns: 1fr; gap: 48px; }
  .concept-img-deco { display: none; }

  .services { padding: 80px 0; }
  .services-grid { grid-template-columns: 1fr; gap: 20px; }
  .section-head { margin-bottom: 40px; }

  .feature-inner,
  .feature-inner.reverse { grid-template-columns: 1fr; }
  .feature-inner.reverse .feature-image { order: 0; }
  .feature-inner.reverse .feature-text  { order: 0; }
  .feature-image { aspect-ratio: 4 / 3; min-height: unset; }
  .feature-text { padding: 48px 20px; }

  .book-section { padding: 80px 0; }
  .book-inner { grid-template-columns: 1fr; gap: 40px; }
  .book-cover { max-width: 240px; }

  .members-section { padding: 80px 0; }
  .members-grid { grid-template-columns: 1fr; gap: 48px; }
  .members-card { padding: 32px 24px 36px; }

  .cta { padding: 80px 20px; }
  .footer { padding: 48px 20px; }
  .footer-nav { gap: 20px; }
}

/* ============================================
   ページトップへ戻る
   ============================================ */
#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999;
  width: 3rem;
  height: 3rem;
  border-radius: 9999px;
  background: rgba(139,101,53,0.85);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  box-shadow: 0 4px 16px rgba(139,101,53,0.40);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s ease, transform 0.3s ease;
  backdrop-filter: blur(4px);
}
#back-to-top.show { opacity: 1; visibility: visible; }
#back-to-top:hover { transform: translateY(-3px); background: var(--accent); }
.mobile-menu.open ~ #back-to-top { display: none !important; }