/* ==========================================================================
   日本原子力学会 再処理・リサイクル部会
   リニューアル用 スタイルシート (style.css)
   ========================================================================== */

/* 1. 変数定義とリセット */
:root {
  --color-primary: #1e3a8a;       /* メインのネイビー (信頼・知性) */
  --color-primary-light: #3b82f6; /* 明るめのブルー */
  --color-secondary: #059669;     /* アクセントのエメラルド (リサイクル) */
  --color-secondary-hover: #047857;
  --color-bg: #f8fafc;            /* 背景用ライトグレー */
  --color-card-bg: #ffffff;       /* カード背景の白 */
  --color-text: #1e293b;          /* メインテキスト (濃いグレー) */
  --color-text-light: #64748b;    /* サブテキスト (薄いグレー) */
  --color-border: #e2e8f0;        /* 境界線 */
  --font-sans: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
  --max-width: 1100px;
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px -1px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --transition: all 0.25s ease-in-out;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  text-decoration: underline;
}

/* 2. 基本レイアウト */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* 3. ヘッダー */
.site-header {
  background-color: var(--color-card-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 32px;
  height: 32px;
  color: var(--color-secondary);
}

.site-title {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-light);
  line-height: 1.2;
}

.site-title span {
  display: block;
  font-size: 1.2rem;
  color: var(--color-primary);
  font-weight: 700;
  margin-top: 0.15rem;
}

.site-nav ul {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}

.nav-link {
  color: var(--color-text);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.5rem 0;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-secondary);
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--color-secondary);
  text-decoration: none;
}

.nav-link:hover::after {
  width: 100%;
}

/* 4. ヒーローセクション (明るい未来・シンプルバージョン) */
.hero-section {
  background: linear-gradient(135deg, #eff6ff 0%, #f8fafc 100%);
  color: var(--color-text);
  padding: 4rem 0;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(16,185,129,0.08) 0%, rgba(0,0,0,0) 70%);
  pointer-events: none;
}

.hero-inner-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-text {
  max-width: 680px;
}

.hero-tag {
  display: inline-block;
  background-color: #dcfce7;
  border: 1px solid #bbf7d0;
  color: #15803d;
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.hero-lead {
  font-size: 1.05rem;
  color: #475569;
  font-weight: 500;
  max-width: 680px;
}

.hero-graphic {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-graphic img {
  width: 100%;
  max-width: 320px;
  height: auto;
  border-radius: 16px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.08);
  animation: floatImage 6s ease-in-out infinite;
}

@keyframes floatImage {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-8px); }
  100% { transform: translateY(0px); }
}

@media (max-width: 900px) {
  .hero-inner-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
  }
  
  .hero-text {
    max-width: 100%;
  }

  .hero-graphic img {
    max-width: 240px;
  }
}

/* 5. メインレイアウト */
.main-layout {
  padding: 3rem 0;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 2.5rem;
}

@media (max-width: 900px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
}

/* 6. フィルターコントロール & 検索 & 年度選択 */
.filter-wrapper {
  margin-bottom: 2rem;
  background-color: var(--color-card-bg);
  padding: 1.25rem 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 1.75rem;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.filter-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text-light);
  white-space: nowrap;
}

.filter-buttons {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 0.4rem 1rem;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover {
  background-color: #e2e8f0;
  border-color: #cbd5e1;
}

.filter-btn.active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

/* 年度選択セレクトボックス */
#year-select {
  padding: 0.4rem 2rem 0.4rem 0.75rem;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  background-color: white;
  cursor: pointer;
  outline: none;
  transition: var(--transition);
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'></polyline></svg>");
  background-repeat: no-repeat;
  background-position: right 8px center;
}

#year-select:hover {
  border-color: #cbd5e1;
  background-color: #f8fafc;
}

/* 検索ボックス */
.search-box {
  margin-left: auto;
}

@media (max-width: 900px) {
  .search-box {
    margin-left: 0;
    width: 100%;
  }
}

#search-input {
  padding: 0.4rem 0.8rem 0.4rem 2.2rem;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  font-size: 0.875rem;
  width: 220px;
  outline: none;
  background: white url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><circle cx='11' cy='11' r='8'></circle><line x1='21' y1='21' x2='16.65' y2='16.65'></line></svg>") no-repeat 10px center;
  transition: var(--transition);
}

@media (max-width: 900px) {
  #search-input {
    width: 100%;
  }
}

#search-input:focus {
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
}

/* NEWバッジ */
.badge-new {
  display: inline-block;
  background-color: var(--color-secondary);
  color: white;
  font-size: 0.65rem;
  font-weight: 800;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  margin-left: 0.5rem;
  vertical-align: middle;
  letter-spacing: 0.05em;
  line-height: 1.3;
}

/* 7. お知らせリスト・カード */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.news-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
}

.news-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1;
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.news-date {
  font-size: 0.9rem;
  color: var(--color-text-light);
  font-weight: 500;
  font-family: monospace, sans-serif;
}

/* カテゴリ別タグカラー */
.news-tag {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  text-transform: uppercase;
}

.tag-default {
  background-color: #f1f5f9;
  color: #475569;
}

.tag-seminar {
  background-color: #dcfce7;
  color: #15803d;
}

.tag-award {
  background-color: #dbeafe;
  color: #1d4ed8;
}

.tag-report {
  background-color: #f3e8ff;
  color: #6b21a8;
}

.news-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.news-content {
  color: var(--color-text);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  white-space: pre-wrap;
}

/* PDFダウンロードエリア */
.news-downloads {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
}

.download-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background-color: #f8fafc;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  width: fit-content;
  transition: var(--transition);
}

.download-link:hover {
  background-color: #f1f5f9;
  border-color: #cbd5e1;
  color: var(--color-primary-light);
  text-decoration: none;
}

.download-icon {
  width: 16px;
  height: 16px;
  color: #ef4444; /* PDFをイメージした赤 */
  flex-shrink: 0;
}

.download-icon-doc {
  width: 16px;
  height: 16px;
  color: #3b82f6; /* Wordなどをイメージした青 */
  flex-shrink: 0;
}

/* 空状態 */
.empty-state {
  text-align: center;
  padding: 3rem 1.5rem;
  background-color: var(--color-card-bg);
  border: 1px dashed var(--color-border);
  border-radius: 8px;
  color: var(--color-text-light);
}

/* 8. サイドバー */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.sidebar-widget {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.widget-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  border-left: 3px solid var(--color-secondary);
  padding-left: 0.5rem;
  line-height: 1.2;
}

.widget-content {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.widget-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.widget-list a {
  color: var(--color-text);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.widget-list a:hover {
  color: var(--color-primary-light);
  text-decoration: none;
}

.widget-list a::after {
  content: '→';
  font-size: 0.8rem;
  color: var(--color-text-light);
}

/* 9. フッター */
.site-footer {
  background-color: #0f172a;
  color: #94a3b8;
  padding: 2.5rem 0;
  border-top: 1px solid #1e293b;
  font-size: 0.85rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-copyright {
  color: #64748b;
}

/* 10. ローディング表示 */
.loading {
  text-align: center;
  padding: 4rem 0;
  color: var(--color-text-light);
  font-weight: 500;
}

.spinner {
  border: 3px solid rgba(0, 0, 0, 0.1);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border-left-color: var(--color-primary);
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}