/* ==========================================================================
   Pickleball Hub - Clean Event Portal Design System
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Variables & Reset
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette (Intex Osaka Inspired) */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  
  --color-primary: #0a2540;      /* 深いネイビー (信頼感・洗練) */
  --color-primary-light: #1e3a8a;
  --color-secondary: #0066cc;    /* クリーンなブルー (アクティブ) */
  --color-secondary-light: #3b82f6;
  --color-accent: #ff6b00;       /* 快活なオレンジ (アクセント) */
  --color-accent-hover: #e05e00;
  
  --text-main: #1e293b;          /* メイン文字色 */
  --text-sub: #64748b;           /* サブ文字色 */
  --text-white: #ffffff;
  
  --border-color: #e2e8f0;
  --card-shadow: 0 4px 20px rgba(15, 23, 42, 0.05);
  --card-shadow-hover: 0 10px 30px rgba(15, 23, 42, 0.1);
  
  /* Fonts */
  --font-family: 'Barlow', 'Noto Sans JP', sans-serif;
  
  /* Layout */
  --header-height: 80px;
  --container-width: 1200px;
  --transition-normal: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-fast: all 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* --------------------------------------------------------------------------
   2. Common Utilities
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section-inner {
  padding: 80px 0;
  transition: var(--transition-normal);
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--color-primary);
  position: relative;
  display: inline-block;
  padding-bottom: 12px;
  letter-spacing: -0.02em;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
  border-radius: 2px;
}

.section-subtitle {
  font-size: 0.9rem;
  color: var(--text-sub);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-top: 8px;
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   3. Buttons & UI Elements
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-family);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 10px 24px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: var(--transition-normal);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--text-white);
  box-shadow: 0 4px 12px rgba(255, 107, 0, 0.2);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(255, 107, 0, 0.35);
}

.btn-secondary {
  background-color: var(--bg-primary);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: var(--text-white);
  transform: translateY(-2px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-secondary);
  border: 2px solid var(--color-secondary);
}

.btn-outline:hover {
  background-color: var(--color-secondary);
  color: var(--text-white);
  transform: translateY(-2px);
}

/* --- No Image Placeholder --- */
.no-image-placeholder {
  width: 100%;
  height: 100%;
  min-height: 200px;
  background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-sub);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
  user-select: none;
}

.no-image-placeholder::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at center, rgba(255, 255, 255, 0.4) 0%, transparent 80%);
  pointer-events: none;
}

.no-image-placeholder i {
  font-size: 2.2rem;
  margin-bottom: 8px;
  color: #94a3b8;
}

.no-image-placeholder span {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 4px;
  opacity: 0.7;
}

/* --------------------------------------------------------------------------
   4. Header & Navigation (Sticky & Sleek)
   -------------------------------------------------------------------------- */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: var(--transition-normal);
}

.main-header.scrolled {
  box-shadow: var(--card-shadow-hover);
  height: 70px;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo-area {
  font-size: 1.6rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  text-decoration: none;
  display: flex;
  align-items: center;
}

.logo-accent {
  color: var(--color-secondary);
}

.logo-text {
  color: var(--color-primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-item {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 8px 16px;
  border-radius: 4px;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-item i {
  font-size: 0.95rem;
  color: var(--text-sub);
  transition: var(--transition-fast);
}

.nav-item:hover {
  background-color: var(--bg-tertiary);
  color: var(--color-secondary);
}

.nav-item:hover i {
  color: var(--color-secondary);
}

.nav-item.active {
  color: var(--color-secondary);
  position: relative;
}

.nav-item.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 16px;
  right: 16px;
  height: 3px;
  background-color: var(--color-secondary);
  border-radius: 2px;
}

.header-cta {
  margin-left: 10px;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 1010;
}

.mobile-nav-toggle span {
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  transition: var(--transition-normal);
  border-radius: 1px;
}

/* --------------------------------------------------------------------------
   5. Main Visual (単一ビジュアル - アスペクト比維持のための二層構造)
   -------------------------------------------------------------------------- */
.hero-section {
  position: relative;
  height: 580px;
  margin-top: var(--header-height);
  overflow: hidden;
  background-color: #020617; /* 暗いベース背景 */
}

/* 画像を表示するコンテナ */
.hero-visual-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* 背景ぼかし層 */
.hero-visual-bg {
  position: absolute;
  inset: -20px; /* ぼかした縁が見切れるのを防ぐための拡張 */
  background-size: cover;
  background-position: center;
  filter: blur(20px) brightness(0.45);
  z-index: 1;
  pointer-events: none;
}

/* 前面クッキリ表示層 */
.hero-visual-img {
  position: relative;
  z-index: 2;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain; /* アスペクト比を完全に維持 */
  pointer-events: none;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(10, 37, 64, 0.75) 0%, rgba(10, 37, 64, 0.3) 60%, rgba(10, 37, 64, 0.1) 100%);
  z-index: 3;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 4;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  pointer-events: none; /* コンテンツ下のリンククリックを妨げない */
}

.hero-text-side {
  max-width: 620px;
  color: var(--text-white);
  pointer-events: auto; /* ボタンなどがクリックできるように設定 */
}

.hero-badge {
  display: inline-block;
  background-color: var(--color-secondary);
  color: var(--text-white);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero-title span {
  background: linear-gradient(120deg, #38bdf8 0%, #00ffcc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: 1.1rem;
  opacity: 0.95;
  margin-bottom: 30px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
}

/* Intex Osaka style overlay card (News / Quick Info) */
.hero-news-overlay {
  position: absolute;
  bottom: 0;
  right: 5%;
  width: 380px;
  background-color: var(--bg-primary);
  border-radius: 12px 12px 0 0;
  box-shadow: 0 -5px 25px rgba(0,0,0,0.15);
  z-index: 5;
  overflow: hidden;
  border: 1px solid var(--border-color);
  border-bottom: none;
  display: block;
}

.news-card-header {
  background-color: var(--color-primary);
  color: var(--text-white);
  padding: 14px 20px;
  font-weight: 800;
  font-size: 0.95rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.news-card-header span {
  font-size: 0.75rem;
  background-color: var(--color-accent);
  padding: 2px 6px;
  border-radius: 3px;
}

.news-card-body {
  padding: 20px;
}

.news-item {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 12px;
  margin-bottom: 12px;
}

.news-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0;
}

.news-date {
  font-size: 0.75rem;
  color: var(--color-secondary);
  font-weight: 700;
  margin-bottom: 4px;
}

.news-title {
  font-size: 0.88rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-primary);
  text-decoration: none;
  display: block;
  transition: var(--transition-fast);
}

.news-title:hover {
  color: var(--color-secondary);
}

/* --------------------------------------------------------------------------
   6. Section 1: ABOUT (ピックルとは？)
   -------------------------------------------------------------------------- */
#about {
  background-color: var(--bg-primary);
}

.about-intro-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 50px;
  align-items: center;
  margin-bottom: 60px;
}

.about-text h3 {
  font-size: 1.8rem;
  color: var(--color-primary);
  margin-bottom: 15px;
  font-weight: 800;
}

.about-text p {
  color: var(--text-sub);
  margin-bottom: 20px;
}

.about-visual {
  width: 100%;
}

.about-visual .no-image-placeholder {
  aspect-ratio: 16 / 10;
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.about-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 30px;
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.about-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--color-secondary-light);
}

.card-icon {
  width: 54px;
  height: 54px;
  background-color: rgba(0, 102, 204, 0.08);
  border-radius: 8px;
  color: var(--color-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  transition: var(--transition-fast);
}

.about-card:hover .card-icon {
  background-color: var(--color-secondary);
  color: var(--text-white);
}

.about-card h4 {
  font-size: 1.2rem;
  color: var(--color-primary);
  margin-bottom: 12px;
  font-weight: 700;
}

.about-card p {
  font-size: 0.95rem;
  color: var(--text-sub);
}

.about-association {
  text-align: center;
  margin-top: 50px;
  padding: 25px;
  background-color: var(--bg-tertiary);
  border-radius: 8px;
}

.about-association p {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 12px;
}

.link-btn {
  color: var(--color-secondary);
  text-decoration: none;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition-fast);
}

.link-btn:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   7. Section 2: EVENTS (今後のイベント)
   -------------------------------------------------------------------------- */
#events {
  background-color: var(--bg-secondary);
}

.events-container {
  max-width: 900px;
  margin: 0 auto;
}

/* プレースホルダーの拡大によってテキストが潰れるのを防ぐため flex に変更 */
.event-featured-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: var(--card-shadow);
  overflow: hidden;
  display: flex;
  margin-bottom: 40px;
  transition: var(--transition-normal);
}

.event-featured-card:hover {
  box-shadow: var(--card-shadow-hover);
}

/* 画像側: カード幅の 40%〜45% を厳密に割り当て */
.event-img-side {
  width: 42%;
  flex-shrink: 0;
  position: relative;
}

.event-img-side .no-image-placeholder {
  min-height: 100%;
  border: none;
  border-radius: 0;
  aspect-ratio: auto;
}

/* テキスト側: 十分なスペースを確保 */
.event-content-side {
  width: 58%;
  padding: 35px 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.event-badge {
  display: inline-block;
  align-self: flex-start;
  background-color: rgba(255, 107, 0, 0.1);
  color: var(--color-accent);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
  border: 1px solid rgba(255, 107, 0, 0.2);
}

.event-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 15px;
  line-height: 1.45;
  letter-spacing: -0.01em;
}

.event-details {
  margin-bottom: 20px;
  list-style: none;
}

.event-details li {
  font-size: 0.92rem;
  color: var(--text-sub);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
  line-height: 1.5;
}

.event-details li i {
  color: var(--color-secondary);
  width: 16px;
  text-align: center;
}

.event-cta-box {
  background-color: var(--bg-tertiary);
  border-radius: 8px;
  padding: 30px;
  text-align: center;
}

.event-cta-box h4 {
  font-size: 1.15rem;
  color: var(--color-primary);
  margin-bottom: 10px;
  font-weight: 700;
}

.event-cta-box p {
  font-size: 0.9rem;
  color: var(--text-sub);
  margin-bottom: 20px;
}

/* --------------------------------------------------------------------------
   8. Section 3: RADIO (ピックルラジオ)
   -------------------------------------------------------------------------- */
#radio {
  background-color: var(--bg-primary);
}

.radio-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 50px;
  align-items: center;
}

.radio-info-side {
  display: flex;
  flex-direction: column;
}

.radio-badge {
  align-self: flex-start;
  background-color: rgba(0, 102, 204, 0.08);
  color: var(--color-secondary);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 15px;
}

.radio-title {
  font-size: 2rem;
  color: var(--color-primary);
  margin-bottom: 15px;
  font-weight: 800;
}

.radio-desc {
  color: var(--text-sub);
  margin-bottom: 30px;
}

.radio-cover-area {
  display: flex;
  align-items: center;
  gap: 20px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 20px;
  border-radius: 8px;
  max-width: 460px;
}

.radio-cover-img {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: 6px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.radio-cover-text strong {
  display: block;
  font-size: 0.95rem;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.radio-cover-text p {
  font-size: 0.8rem;
  color: var(--text-sub);
}

/* Spotify Container */
.spotify-embed-container {
  width: 100%;
  box-shadow: var(--card-shadow-hover);
  border-radius: 12px;
  overflow: hidden;
  background-color: #000;
  border: 1px solid var(--border-color);
}

.spotify-embed-container iframe {
  display: block;
}

/* Members Area */
.members-area {
  margin-top: 80px;
  border-top: 1px solid var(--border-color);
  padding-top: 60px;
}

.members-title {
  text-align: center;
  font-size: 1.5rem;
  color: var(--color-primary);
  font-weight: 800;
  margin-bottom: 40px;
}

.members-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.member-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.member-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-shadow-hover);
}

.member-image-placeholder {
  width: 100%;
  height: 180px;
  background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--border-color);
}

.member-fallback-icon {
  font-size: 3.5rem;
  color: #94a3b8;
}

.member-info {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.member-info h4 {
  font-size: 1.2rem;
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: 4px;
}

.member-role {
  font-size: 0.75rem;
  color: var(--color-secondary);
  font-weight: 700;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.member-bio {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 20px;
  flex: 1;
}

.member-social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--text-sub);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px;
  border-radius: 4px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  transition: var(--transition-fast);
}

.member-social-link:hover {
  background-color: var(--color-secondary);
  color: var(--text-white);
  border-color: var(--color-secondary);
}

/* --------------------------------------------------------------------------
   9. Section 4: PAST EVENTS (過去のイベント - 画像アスペクト比対応)
   -------------------------------------------------------------------------- */
#past-events {
  background-color: var(--bg-secondary);
}

/* 3つカード表示用としてカラムを3に変更 */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

/* a.gallery-card にも対応できるようスタイルの整合性を確保 */
.gallery-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}

.gallery-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--color-secondary-light);
}

/* 縦長画像（firstevent, firstevent2, image1）が綺麗に見えるアスペクト比 3/4 */
.gallery-img-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background-color: var(--bg-tertiary);
  transition: var(--transition-normal);
}

.gallery-img {
  width: 100%;
  height: 100%;
  object-fit: cover; /* 縦長比率内で綺麗にトリミング表示 */
  transition: transform 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.gallery-card:hover .gallery-img {
  transform: scale(1.04);
}

.gallery-info {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.gallery-date {
  font-size: 0.75rem;
  color: var(--color-secondary);
  font-weight: 700;
  margin-bottom: 6px;
}

.gallery-title {
  font-size: 1.15rem;
  color: var(--color-primary);
  font-weight: 800;
  margin-bottom: 8px;
  line-height: 1.4;
}

.gallery-desc {
  font-size: 0.88rem;
  color: var(--text-sub);
  line-height: 1.6;
}

/* noteへのリンク用特別カラー */
.gallery-card.link-card:hover {
  border-color: #2cb696; /* noteカラーに近いグリーン系のアクセント */
}
.gallery-card.link-card:hover .gallery-date {
  color: #2cb696;
}

/* --------------------------------------------------------------------------
   10. Section 5: CONTACT (お問い合わせ - セキュアフォーム)
   -------------------------------------------------------------------------- */
#contact {
  background-color: var(--bg-primary);
}

.contact-container {
  max-width: 680px;
  margin: 0 auto;
}

.contact-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 40px;
  box-shadow: var(--card-shadow);
}

.contact-intro-text {
  text-align: center;
  color: var(--text-sub);
  margin-bottom: 30px;
  font-size: 0.95rem;
}

.form-group {
  margin-bottom: 24px;
}

.form-label {
  display: block;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.form-label span {
  color: var(--color-accent);
  margin-left: 4px;
  font-size: 0.8rem;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-family);
  font-size: 0.95rem;
  color: var(--text-main);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  transition: var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.15);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

.form-actions {
  text-align: center;
  margin-top: 30px;
}

.form-actions .btn {
  width: 100%;
  max-width: 280px;
  padding: 12px 30px;
  font-size: 1rem;
}

/* --------------------------------------------------------------------------
   11. Footer
   -------------------------------------------------------------------------- */
.main-footer {
  background-color: var(--color-primary);
  color: var(--text-white);
  padding: 40px 0;
  border-top: 4px solid var(--color-secondary);
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.03em;
}

.footer-logo-accent {
  color: var(--color-secondary-light);
}

.footer-nav {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-nav a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  transition: var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--text-white);
}

.footer-copy {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  margin-top: 10px;
}

/* --------------------------------------------------------------------------
   12. Dynamic Toast Notification (XSS Safe)
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 9999;
  pointer-events: none;
}

.toast {
  background-color: var(--color-primary);
  color: var(--text-white);
  padding: 16px 24px;
  border-radius: 8px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.25);
  display: flex;
  align-items: center;
  gap: 12px;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  border-left: 4px solid #10b981; /* 成功の緑 */
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.toast-icon {
  font-size: 1.25rem;
  color: #10b981;
}

.toast-message {
  font-size: 0.9rem;
  font-weight: 700;
}

/* --------------------------------------------------------------------------
   13. Responsive Styles (スマホでの見え方・画像サイズ最適化)
   -------------------------------------------------------------------------- */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.6rem;
  }
  .about-intro-grid,
  .radio-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .about-grid,
  .members-grid,
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-news-overlay {
    display: none; /* スマホ・タブレットはスライダー下部の立体カードを非表示 */
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 70px;
  }
  .main-header.scrolled {
    height: 70px;
  }
  
  /* 余白調整で画面に収まりやすくする */
  .section-inner {
    padding: 50px 0;
  }
  .section-header {
    margin-bottom: 30px;
  }
  
  /* Mobile Menu Toggle */
  .mobile-nav-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 20px;
    gap: 10px;
    box-shadow: 0 10px 15px rgba(0,0,0,0.05);
    transform: translateY(-120%);
    transition: var(--transition-normal);
    z-index: 999;
  }
  
  .nav-menu.open {
    transform: translateY(0);
  }
  
  .nav-item {
    width: 100%;
    padding: 12px 20px;
    justify-content: flex-start;
  }
  
  .nav-item.active::after {
    left: 0;
    right: auto;
    width: 4px;
    height: 100%;
    top: 0;
    bottom: 0;
    border-radius: 0 2px 2px 0;
  }
  
  .header-cta {
    width: 100%;
    margin-left: 0;
    margin-top: 10px;
  }
  
  .header-cta .btn {
    width: 100%;
  }
  
  /* Hamburger Open State */
  .mobile-nav-toggle.open span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .mobile-nav-toggle.open span:nth-child(2) {
    opacity: 0;
  }
  .mobile-nav-toggle.open span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  /* --- ヒーローエリアのスマホ最適化 --- */
  .hero-section {
    height: 440px; /* 高さを抑えて要素をコンパクトに収める */
  }
  
  .hero-overlay {
    /* 中央の画像と前面テキストのコントラストを高めるため、ぼかしに合わせた強めの暗色グラデーションを設定 */
    background: radial-gradient(circle at center, rgba(10, 37, 64, 0.6) 0%, rgba(10, 37, 64, 0.9) 100%);
  }
  
  .hero-title {
    font-size: 2.0rem; /* 文字サイズを適切に縮小 */
    line-height: 1.3;
    margin-bottom: 12px;
    /* テキスト可読性を担保するための強いシャドウ */
    text-shadow: 0 4px 15px rgba(2, 6, 23, 0.95), 0 2px 4px rgba(2, 6, 23, 0.95);
  }
  
  .hero-lead {
    font-size: 0.92rem;
    line-height: 1.6;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(2, 6, 23, 0.95);
  }
  
  .hero-actions {
    gap: 12px;
  }
  
  .hero-actions .btn {
    padding: 8px 18px;
    font-size: 0.88rem;
  }

  /* --- 各種グリッドのスマホ表示縦並び化 --- */
  .about-grid,
  .members-grid,
  .gallery-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  /* --- 今後のイベントのスマホ表示最適化 --- */
  .event-featured-card {
    flex-direction: column;
  }
  .event-img-side {
    width: 100%;
    height: 180px; /* スマホ向けに高さを小さく調整 */
  }
  .event-content-side {
    width: 100%;
    padding: 24px;
  }
  .event-title {
    font-size: 1.25rem; /* スマホ用にタイトルをさらに調整 */
    margin-bottom: 12px;
  }
  
  /* --- ラジオのスマホ表示最適化 --- */
  .radio-cover-area {
    max-width: 100%;
    width: 100%;
  }

  /* --- 過去のイベント画像のスマホ巨大化防止 --- */
  .gallery-img-wrapper {
    /* 縦長(3/4)のままだと幅一杯に広がった際に縦に長くなりすぎるため、横長(4/3)に切り替える */
    aspect-ratio: 4 / 3;
  }
  .gallery-title {
    font-size: 1.1rem;
  }
  
  .contact-card {
    padding: 24px;
  }
  .footer-nav {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }
}