/**
 * 母（Song Kum Sook様）追悼スライドショーサイト
 * スタイルシート - 黄色を基調とした温もりと品格のあるデザインシステム
 */

:root {
  /* カラーパレット */
  --color-primary: #D4A017;
  --color-primary-light: #F6E27A;
  --color-primary-soft: #FFF9E6;
  --color-primary-dark: #A67C00;
  --color-bg: #FAF8F5;
  --color-surface: #FFFFFF;
  --color-surface-translucent: rgba(255, 255, 255, 0.92);
  --color-text-main: #2A2621;
  --color-text-muted: #6B645C;
  --color-border: #E8E2D8;
  --color-border-light: #F2ECE1;
  --color-theater-bg: #141312;
  --color-theater-overlay: rgba(20, 19, 18, 0.75);

  /* タイポグラフィ */
  --font-serif: 'Noto Serif KR', 'Noto Serif JP', 'Batang', 'Song Myung', 'Yu Mincho', serif;
  --font-sans: 'Noto Sans KR', 'Noto Sans JP', system-ui, -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Malgun Gothic', 'Nanum Gothic', 'Hiragino Sans', sans-serif;

  /* シャドウ & トランジション */
  --shadow-sm: 0 2px 8px rgba(42, 38, 33, 0.06);
  --shadow-md: 0 6px 20px rgba(42, 38, 33, 0.08);
  --shadow-lg: 0 12px 36px rgba(42, 38, 33, 0.14);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s ease;
}

/* リセット & ベーススタイル */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

button, input, select, textarea {
  font-family: inherit;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--color-bg);
  color: var(--color-text-main);
  width: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  line-height: 1.7;
  min-height: 100vh;
  width: 100%;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  background: radial-gradient(circle at 50% 0%, var(--color-primary-soft) 0%, var(--color-bg) 60%);
  -webkit-font-smoothing: antialiased;
}

/* ユーティリティ */
.hidden {
  display: none !important;
}

/* ヘッダー */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background-color: var(--color-surface-translucent);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.title-group {
  display: flex;
  flex-direction: column;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.yellow-accent-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  box-shadow: 0 0 8px rgba(212, 160, 23, 0.5);
}

.site-subtitle {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* 言語切り替えボタングループ */
.lang-switcher {
  display: flex;
  background-color: var(--color-border-light);
  border-radius: 30px;
  padding: 3px;
  border: 1px solid var(--color-border);
}

.lang-btn {
  background: transparent;
  border: none;
  padding: 0.4rem 0.9rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  color: var(--color-text-main);
}

.lang-btn.active {
  background-color: var(--color-surface);
  color: var(--color-primary-dark);
  box-shadow: var(--shadow-sm);
}

/* メインコンテンツ */
.main-content {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* スライドショーセクション */
.slideshow-section {
  display: flex;
  flex-direction: column;
  background-color: var(--color-theater-bg);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(212, 160, 23, 0.25);
}

/* スライドショー表示領域 */
.slideshow-viewport {
  position: relative;
  width: 100%;
  height: min(76vh, 680px);
  background-color: var(--color-theater-bg);
  display: flex;
  justify-content: center;
  align-items: center;
  user-select: none;
  overflow: hidden;
}

.slide-img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  opacity: 0;
  transform: scale(0.99);
  transition: opacity 0.5s ease-in-out, transform 0.6s ease-out;
}

.slide-img.active {
  opacity: 1;
  transform: scale(1);
}

/* ビューポート上の左右矢印ボタン */
.nav-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(20, 19, 18, 0.6);
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.2);
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: all var(--transition-fast);
  z-index: 10;
}

.nav-arrow:hover {
  background-color: var(--color-primary);
  color: #141312;
  border-color: var(--color-primary-light);
  transform: translateY(-50%) scale(1.08);
}

.nav-arrow:active {
  transform: translateY(-50%) scale(0.95);
}

.nav-arrow.prev {
  left: 1.25rem;
}

.nav-arrow.next {
  right: 1.25rem;
}

/* プログレスバー */
.progress-container {
  width: 100%;
  height: 4px;
  background-color: rgba(255, 255, 255, 0.1);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-primary-light), var(--color-primary));
}

/* スライドショーコントロールバー */
.slideshow-controls {
  background-color: #1A1816;
  padding: 1rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.controls-left, .controls-right, .controls-center {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.slide-counter {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-primary-light);
  background: rgba(255, 255, 255, 0.06);
  padding: 0.4rem 0.9rem;
  border-radius: 20px;
  border: 1px solid rgba(212, 160, 23, 0.3);
  letter-spacing: 0.05em;
}

/* 共通コントロールボタン */
.btn-control {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 46px;
  padding: 0.55rem 1.2rem;
  border-radius: 26px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.btn-secondary {
  background-color: rgba(255, 255, 255, 0.1);
  color: #FAF8F5;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.2);
  color: #FFFFFF;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  color: #1C1917;
  box-shadow: 0 3px 12px rgba(212, 160, 23, 0.3);
}

.btn-primary:hover {
  filter: brightness(1.06);
  transform: translateY(-1px);
  box-shadow: 0 5px 16px rgba(212, 160, 23, 0.4);
}

.btn-download {
  background-color: var(--color-surface);
  color: var(--color-text-main);
  border: 1px solid var(--color-primary);
}

.btn-download:hover {
  background-color: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

/* メッセージセクション */
.message-card {
  background-color: var(--color-surface);
  border-radius: 16px;
  padding: 2.25rem 2rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.message-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary-light), var(--color-primary), var(--color-primary-light));
}

.message-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.message-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text-main);
}

.message-body {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.9;
  white-space: pre-line;
  background-color: var(--color-bg);
  padding: 1.5rem;
  border-radius: 10px;
  border-left: 3px solid var(--color-primary);
}

/* フッター */
.site-footer {
  margin-top: auto;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 2rem 1.25rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer-info {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 0.75rem;
  font-weight: 500;
}

.footer-copyright {
  font-size: 0.8rem;
  color: #9C958C;
}

/* 認証モーダル */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(20, 19, 18, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
  opacity: 1;
  transition: opacity 0.3s ease;
}

.modal-overlay.fade-out {
  opacity: 0;
  pointer-events: none;
}

.modal-card {
  background-color: var(--color-surface);
  border-radius: 18px;
  padding: 1.75rem 2rem 2.25rem;
  max-width: 480px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.modal-top-bar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 0.75rem;
}

.modal-top-bar .lang-switcher {
  background-color: var(--color-bg);
}

.modal-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--color-primary-light), var(--color-primary));
}

.modal-icon-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
  border-radius: 50%;
  margin-bottom: 1.25rem;
  border: 1px solid rgba(212, 160, 23, 0.3);
}

.modal-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--color-text-main);
}

.modal-desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 1.75rem;
  line-height: 1.6;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.auth-input {
  width: 100%;
  min-height: 50px;
  padding: 0.75rem 1.25rem;
  border-radius: 10px;
  border: 2px solid var(--color-border);
  font-size: 1rem;
  outline: none;
  transition: border-color var(--transition-fast);
  background-color: var(--color-bg);
}

.auth-input:focus {
  border-color: var(--color-primary);
  background-color: var(--color-surface);
}

.auth-error {
  color: #D32F2F;
  font-size: 0.85rem;
  font-weight: 600;
  text-align: left;
}

.modal-btn-submit {
  min-height: 50px;
  font-size: 1.05rem;
}

/* アニメーション */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

.shake {
  animation: shake 0.4s ease-in-out;
  border-color: #D32F2F !important;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
  .header-container {
    padding: 0.75rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
  }

  .title-group {
    min-width: 0;
    flex: 1;
  }

  .site-title {
    font-size: 1.2rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .site-subtitle {
    font-size: 0.72rem;
    line-height: 1.3;
    margin-top: 2px;
  }

  .lang-switcher {
    flex-shrink: 0;
  }

  .lang-btn {
    padding: 0.35rem 0.65rem;
    font-size: 0.78rem;
  }

  .main-content {
    padding: 0.85rem 0.75rem 2.5rem;
    gap: 1.5rem;
  }

  .slideshow-viewport {
    height: 52vh;
    min-height: 300px;
  }

  .nav-arrow {
    width: 44px;
    height: 44px;
  }

  .nav-arrow.prev {
    left: 0.4rem;
  }

  .nav-arrow.next {
    right: 0.4rem;
  }

  .slideshow-controls {
    display: flex;
    flex-direction: column;
    padding: 0.85rem;
    gap: 0.75rem;
  }

  .controls-left {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
  }

  .controls-left .btn-control {
    flex: 1;
  }

  .controls-right {
    width: 100%;
  }

  .controls-right .btn-control {
    width: 100%;
  }

  .btn-control {
    min-height: 48px;
    font-size: 0.95rem;
    padding: 0.6rem 1.2rem;
  }

  .slide-counter {
    font-size: 1.05rem;
    padding: 0.45rem 0.9rem;
    flex-shrink: 0;
  }

  .message-card {
    padding: 1.5rem 1.15rem;
  }

  .message-title {
    font-size: 1.15rem;
  }

  .message-body {
    font-size: 0.95rem;
    padding: 1rem;
    line-height: 1.75;
  }

  .footer-info {
    flex-direction: column;
    gap: 0.3rem;
  }

  .footer-info span:nth-child(2) {
    display: none;
  }
}