:root {
  --color-bg: #ffffff;
  --color-text: #222222;       /* from site body text */
  --color-primary: #e0bc40;    /* brand accent (gold) */
  --color-accent: #594912;     /* brown accent seen in CSS */
  --color-muted: #fafafa;      /* subtle section background */
  --color-border: #e6e6e6;
  --color-link: #009bb2;       /* link/teal accent */

  --radius: 12px;
  --shadow: 0 6px 18px rgba(0,0,0,.08);
}

/* ダークモード用のCSS変数 */
[data-theme="dark"] {
  --color-bg: #1a1a1a;
  --color-text: #e0e0e0;
  --color-primary: #f4d03f;    /* より明るいゴールド */
  --color-accent: #d4af37;     /* より明るいブラウン */
  --color-muted: #2a2a2a;      /* ダークなセクション背景 */
  --color-border: #404040;
  --color-link: #4dd0e1;       /* より明るいティール */
  --shadow: 0 6px 18px rgba(0,0,0,.3);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Noto Sans JP", system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(6px);
  width: 100%;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  gap: 12px;
}
.brand {
  font-weight: 800;
  letter-spacing: .04em;
  text-decoration: none;
  color: var(--color-text);
}
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 30px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
  position: relative;
}

.hamburger span {
  width: 100%;
  height: 3px;
  background: var(--color-text);
  border-radius: 3px;
  transition: all 0.3s ease;
  transform-origin: center;
}

.hamburger--active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.hamburger--active span:nth-child(2) {
  opacity: 0;
}

.hamburger--active span:nth-child(3) {
  transform: rotate(-45deg) translate(8px, -8px);
}

.nav { display: flex; gap: 18px; align-items: center; }
.nav a { color: var(--color-text); text-decoration: none; font-weight: 600; }
.nav a:hover { color: var(--color-link); }

/* Main content - ヘッダーの下にコンテンツが隠れないように */
main {
  padding-top: 60px;
}

/* Hero */
.hero {
  padding: 72px 0 64px;
  background: linear-gradient(180deg, #fff, var(--color-muted));
  border-bottom: 2px solid var(--color-primary);
}
.eyebrow { color: var(--color-accent); font-weight: 700; letter-spacing: .08em; }
.hero__title { font-size: clamp(24px, 3.6vw, 40px); margin: 8px 0 6px; line-height: 1.3; }
.hero__meta, .hero__venue { color: #666; margin: 0 0 8px; }
.hero__ctas { margin-top: 18px; display: flex; gap: 12px; }

/* Sections */
.section { padding: 56px 0; }
.section--alt { background: var(--color-muted); }
.section--highlight { background: #fff7df; border-top: 2px solid var(--color-primary); border-bottom: 2px solid var(--color-primary); }
.section__title { font-size: 22px; margin: 0 0 16px; border-left: 9px solid var(--color-primary); padding-left: 12px; }
.section__action { margin-top: 16px; }

/* Grid */
.grid { display: grid; gap: 20px; }
.grid--2 { grid-template-columns: 1fr 1fr; }
@media (max-width: 880px) { .grid--2 { grid-template-columns: 1fr; } }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.card { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }
.card__eyebrow { color: var(--color-primary); font-weight: 700; letter-spacing: .08em; }
.card__title { margin: 4px 0 10px; font-size: 18px; }
.card__meta { color: #777; margin: 0 0 6px; }

/* Registration Cards */
.registration-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; margin-top: 2rem; }
.registration-card { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); text-align: center; }
.registration-card__title { margin: 0 0 12px; font-size: 20px; font-weight: 700; color: var(--color-text); }
.registration-card__date { color: var(--color-text); opacity: 0.8; margin: 0 0 20px; font-size: 14px; }
.registration-card .btn { width: 100%; text-align: center; }

/* Lists */
.list { padding-left: 0; margin: 0; }
.list li { margin: 6px 0; }
.list--links a { color: var(--color-link); text-decoration: none; }
.list--links a:hover { text-decoration: underline; }

/* FAQ */
details.faq { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius); padding: 12px 14px; margin: 10px 0; }
details.faq > summary { cursor: pointer; font-weight: 700; }

/* Buttons */
.btn { display: inline-block; padding: 10px 16px; border-radius: 999px; text-decoration: none; font-weight: 700; border: 2px solid transparent; }
.btn--primary { background: var(--color-primary); color: #222; border-color: var(--color-primary); }
.btn--primary:hover { filter: brightness(0.95); }
.btn--ghost { background: #fff; color: var(--color-text); border-color: #d9d7d0; }
.btn--ghost:hover { border-color: var(--color-text); }
.btn--nav { border-color: var(--color-primary); color: var(--color-text); }
.btn--nav:hover { background: var(--color-primary); }
.btn--disabled { 
  opacity: 0.6; 
  cursor: not-allowed; 
  pointer-events: none; 
  background: #ccc; 
  color: #666; 
  border-color: #ccc; 
}
.btn--disabled:hover { 
  filter: none; 
  background: #ccc; 
  color: #666; 
  border-color: #ccc; 
}

/* Links */
.link { color: var(--color-link); text-decoration: none; }
.link:hover { text-decoration: underline; }

.note { color: #666; font-size: .95rem; }
.small { color: #666; font-size: .9rem; }

/* Footer */
.site-footer { border-top: 1px solid var(--color-border); padding: 24px 0; background: var(--color-bg); }

/* ダークモード用の追加スタイル */
[data-theme="dark"] .site-header {
  background: var(--color-bg);
  border-bottom-color: var(--color-border);
}

[data-theme="dark"] .hero {
  background: linear-gradient(180deg, var(--color-bg), var(--color-muted));
}

[data-theme="dark"] .section--highlight {
  background: #2d2d1a; /* ダークモード用のハイライト背景 */
  border-color: var(--color-primary);
}

[data-theme="dark"] .card {
  background: var(--color-bg);
  border-color: var(--color-border);
}

[data-theme="dark"] .registration-card {
  background: var(--color-bg);
  border-color: var(--color-border);
}

[data-theme="dark"] .btn--ghost {
  background: var(--color-bg);
  color: var(--color-text);
  border-color: var(--color-border);
}

[data-theme="dark"] .btn--ghost:hover {
  border-color: var(--color-text);
  background: var(--color-muted);
}

[data-theme="dark"] .btn--disabled {
  background: #555;
  color: #999;
  border-color: #555;
}

[data-theme="dark"] .btn--disabled:hover {
  background: #555;
  color: #999;
  border-color: #555;
}

[data-theme="dark"] details.faq {
  background: var(--color-bg);
  border-color: var(--color-border);
}

/* ボタンのスタイル調整 */
#theme-toggle, #language-toggle {
  min-width: 40px;
  text-align: center;
  font-size: 14px;
  padding: 8px 12px;
}

#theme-toggle {
  font-size: 16px;
}

/* 会場案内のスタイル */
.venue-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}

.venue-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.venue-card__title {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--color-primary);
}

.venue-card__description {
  margin: 0 0 12px;
  line-height: 1.6;
}

.venue-card__address {
  font-weight: 600;
  color: var(--color-accent);
  margin: 0 0 12px;
}

.map-container {
  margin-top: 32px;
}

.map-title {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 16px;
  color: var(--color-text);
}

.map-wrapper {
  margin-bottom: 12px;
}

.map-note {
  text-align: center;
  margin: 0;
}

.map-note a {
  color: var(--color-link);
  text-decoration: none;
  font-weight: 600;
}

.map-note a:hover {
  text-decoration: underline;
}

/* ダークモード用の会場案内スタイル */
[data-theme="dark"] .venue-card {
  background: var(--color-bg);
  border-color: var(--color-border);
}

[data-theme="dark"] .venue-card__title {
  color: var(--color-primary);
}

[data-theme="dark"] .venue-card__address {
  color: var(--color-accent);
}

/* 開催概要のスタイル */
.event-overview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}

.overview-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.overview-card__title {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 16px;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 8px;
}

.event-details {
  background: var(--color-muted);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 24px;
}

/* ダークモード用の開催概要スタイル */
[data-theme="dark"] .overview-card {
  background: var(--color-bg);
  border-color: var(--color-border);
}

[data-theme="dark"] .overview-card__title {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

[data-theme="dark"] .event-details {
  background: var(--color-muted);
}

/* 参加コミュニティ紹介のスタイル */
.communities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin: 32px 0;
}

.community-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.community-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,.12);
}

.community-card__title {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--color-primary);
}

.community-card__description {
  margin: 0 0 16px;
  line-height: 1.6;
  color: var(--color-text);
}

.community-card__links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.community-card__links .link {
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 6px;
  background: var(--color-muted);
  transition: background-color 0.2s ease;
}

.community-card__links .link:hover {
  background: var(--color-primary);
  color: #222;
  text-decoration: none;
}

/* ダークモード用の参加コミュニティ紹介スタイル */
[data-theme="dark"] .community-card {
  background: var(--color-bg);
  border-color: var(--color-border);
}

[data-theme="dark"] .community-card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,.4);
}

[data-theme="dark"] .community-card__title {
  color: var(--color-primary);
}

[data-theme="dark"] .community-card__links .link {
  background: var(--color-muted);
  color: var(--color-text);
}

[data-theme="dark"] .community-card__links .link:hover {
  background: var(--color-primary);
  color: #222;
}

/* コミュニティ表示切り替えボタン */
.community-view-toggle {
  margin: 20px 0;
  display: flex;
  gap: 12px;
  align-items: center;
}

.btn--view-toggle {
  padding: 8px 16px;
  font-size: 14px;
}

.community-view-toggle .btn.active {
  background: var(--color-primary);
  color: #222;
  border-color: var(--color-primary);
}

[data-theme="dark"] .community-view-toggle .btn.active {
  background: var(--color-primary);
  color: #222;
}

/* リスト型表示 */
.communities-list {
  display: block !important;
  grid-template-columns: none !important;
}

.communities-list .community-card {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 20px;
  padding: 20px;
}

.communities-list .community-card__title {
  min-width: 200px;
  margin: 0;
  font-size: 18px;
}

.communities-list .community-card__description {
  flex: 1;
  margin: 0 0 12px;
}

.communities-list .community-card__links {
  margin-top: 8px;
}

@media (max-width: 768px) {
  .communities-list .community-card {
    flex-direction: column;
    gap: 12px;
  }
  
  .communities-list .community-card__title {
    min-width: auto;
  }
  
  .communities-list .community-card__description {
    display: none !important;
    flex: none !important;
  }
}

/* 登壇者・スタッフカードのスタイル */
.person-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 32px;
  margin-top: 32px;
}

.person-card {
  text-align: center;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px 20px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.person-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,.12);
}

.person-card__avatar {
  position: relative;
  width: 120px;
  height: 120px;
  margin: 0 auto 16px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--color-muted);
  display: flex;
  align-items: center;
  justify-content: center;
}

.person-card__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.person-card__avatar-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--color-text);
  opacity: 0.5;
}

.person-card__avatar img + .person-card__avatar-icon {
  display: none;
}

.person-card__name {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 16px;
  color: var(--color-text);
}

.person-card__sns {
  display: flex;
  gap: 12px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.sns-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: var(--color-text);
  background: var(--color-muted);
  text-decoration: none;
  transition: all 0.2s ease;
}

.sns-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,.15);
}

.sns-link--x:hover {
  background: #000;
  color: #fff;
}

.sns-link--facebook:hover {
  background: #1877f2;
  color: #fff;
}

.sns-link--instagram:hover {
  background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
  color: #fff;
}

.sns-link--linkedin:hover {
  background: #0a66c2;
  color: #fff;
}

/* ダークモード用の登壇者・スタッフカードスタイル */
[data-theme="dark"] .person-card {
  background: var(--color-bg);
  border-color: var(--color-border);
}

[data-theme="dark"] .person-card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,.4);
}

[data-theme="dark"] .person-card__avatar {
  background: var(--color-muted);
}

[data-theme="dark"] .person-card__avatar-icon {
  color: var(--color-text);
}

[data-theme="dark"] .sns-link {
  background: var(--color-muted);
  color: var(--color-text);
}

/* 閲覧者数表示（左側固定の吹き出し） */
.viewer-count-bubble {
  position: fixed;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 999;
  background: var(--color-bg);
  border: 2px solid var(--color-primary);
  border-radius: 12px;
  padding: 12px 16px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  max-width: 200px;
  font-size: 0.85rem;
  line-height: 1.4;
  color: var(--color-text);
  animation: fadeIn 0.5s ease-in;
}

.viewer-count-bubble::before {
  content: '';
  position: absolute;
  left: -8px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  border-right: 8px solid var(--color-primary);
}

.viewer-count-bubble::after {
  content: '';
  position: absolute;
  left: -6px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  border-right: 8px solid var(--color-bg);
}

.viewer-count-text {
  display: block;
  font-weight: 500;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-50%) translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
  }
}

/* ダークモード対応 */
[data-theme="dark"] .viewer-count-bubble {
  background: var(--color-bg);
  border-color: var(--color-primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .viewer-count-bubble::after {
  border-right-color: var(--color-bg);
}

/* モバイル対応 */
@media (max-width: 768px) {
  .viewer-count-bubble {
    left: 10px;
    max-width: 160px;
    font-size: 0.75rem;
    padding: 10px 12px;
  }
}

@media (max-width: 480px) {
  .viewer-count-bubble {
    display: none; /* 小さい画面では非表示 */
  }
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
  .person-cards {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 24px;
  }
  
  .person-card__avatar {
    width: 100px;
    height: 100px;
  }
  
  .person-card__name {
    font-size: 16px;
  }
}

/* マウスポインタを星に変更 */
* {
  cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24'%3E%3Cpath fill='%23e0bc40' d='M12 2l3.09 6.26L22 9.27l-5 4.87 1.18 6.88L12 17.77l-6.18 3.25L7 14.14 2 9.27l6.91-1.01L12 2z'/%3E%3C/svg%3E") 12 12, auto;
}

/* カーソル追従エフェクト */
.cursor-trail {
  position: fixed;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  pointer-events: none;
  z-index: 9999;
  opacity: 0.8;
  transform: translate(-50%, -50%);
  transition: opacity 0.3s ease, transform 0.1s ease;
}

.cursor-trail.sparkle {
  width: 12px;
  height: 12px;
  background: radial-gradient(circle, var(--color-primary) 0%, transparent 70%);
  box-shadow: 0 0 8px var(--color-primary), 0 0 16px var(--color-primary);
  animation: sparkle 0.5s ease-out forwards;
}

.cursor-trail.click {
  width: 20px;
  height: 20px;
  background: radial-gradient(circle, var(--color-primary) 0%, transparent 70%);
  box-shadow: 0 0 12px var(--color-primary), 0 0 24px var(--color-primary);
  animation: clickFlash 0.6s ease-out forwards;
}

@keyframes sparkle {
  0% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(2);
  }
}

@keyframes clickFlash {
  0% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
  50% {
    opacity: 0.8;
    transform: translate(-50%, -50%) scale(1.5);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(2.5);
  }
}

/* モバイル対応 */
@media (max-width: 768px) {
  /* モバイルではカーソルエフェクトを軽量化 */
  .cursor-trail {
    display: none;
  }
  
  /* ハンバーガーメニュー */
  .hamburger {
    display: flex;
  }
  
  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background: var(--color-bg);
    border-left: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: 80px 24px 24px;
    gap: 0;
    transition: right 0.3s ease;
    box-shadow: -2px 0 8px rgba(0, 0, 0, 0.1);
    overflow-y: auto;
    z-index: 1000;
  }
  
  .nav--open {
    right: 0;
  }
  
  .nav a,
  .nav button {
    width: 100%;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
    text-align: left;
    display: block;
  }
  
  .nav a.btn--nav,
  .nav button {
    margin-top: 12px;
    border: 2px solid var(--color-border);
    border-radius: 999px;
    text-align: center;
    padding: 10px 16px;
  }
  
  .nav a:last-of-type {
    border-bottom: none;
  }
  
  /* モバイル時のヘッダーコンテナ */
  .site-header .container {
    position: relative;
  }
}