/* ============================================================
   元素トレンド (Element Trends) スタイル
   周期表本体のダークな科学テーマに合わせた配色・カード表現。
   trends.html 専用（index.html のウィジェットは最小CSSをインライン）。
   ============================================================ */

:root {
  --bg-dark: #0a0e14;
  --bg-panel: #0d1117;
  --bg-card: #161b22;
  --border: #21262d;
  --text: #e6edf3;
  --text-muted: #7d8590;
  --accent-cyan: #00d4ff;
  --accent-green: #00ff88;
  --accent-purple: #a855f7;
  --accent-pink: #ff6b9d;
  --accent-orange: #ff9500;
  --accent-yellow: #ffd700;
  --accent-red: #ff4757;

  --alkali: #ff6b6b;
  --alkaline: #ffa502;
  --transition: #ffd43b;
  --post-transition: #69db7c;
  --metalloid: #4dabf7;
  --nonmetal: #38d9a9;
  --halogen: #da77f2;
  --noble: #748ffc;
  --lanthanide: #f783ac;
  --actinide: #e599f7;
  --unknown: #495057;

  --glow: 0 0 20px;
}

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

html { font-size: 14px; scroll-behavior: smooth; }

body {
  font-family: "JetBrains Mono", "Noto Sans JP", "Noto Sans SC", "Noto Sans KR", monospace;
  background: var(--bg-dark);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* トップページと同じアニメーション背景（放射グラデーション＋グリッド） */
body::before {
  content: '';
  position: fixed; inset: 0;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(0, 212, 255, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(168, 85, 247, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(0, 255, 136, 0.03) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}
body::after {
  content: '';
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: 0;
}

a { color: var(--accent-cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* --- ナビ（トップページの表示切替と同じ雰囲気） --- */
.trends-nav {
  display: flex; flex-wrap: wrap; gap: 8px;
  justify-content: center; align-items: center;
  padding: 14px 16px;
  background: rgba(13, 17, 23, 0.85);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(8px);
}
.trends-nav a {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px; border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-card); color: var(--text);
  font-size: 0.85rem; transition: all 0.15s;
}
.trends-nav a:hover { border-color: var(--accent-cyan); text-decoration: none; }
.trends-nav a.active {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.25);
}

/* --- \u8a00\u8a9e\u5207\u66ff\uff08\u30c8\u30c3\u30d7\u30da\u30fc\u30b8\u3068\u540c\u3058\u53f3\u4e0a\u56fa\u5b9a\u306e\u4e38\u30dc\u30bf\u30f3\uff09 --- */
.lang-switcher {
  position: fixed;
  top: 15px; right: 15px;
  z-index: 1000;
  display: flex; gap: 5px;
  background: var(--bg-panel);
  padding: 6px;
  border-radius: 25px;
  border: 1px solid var(--border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}
.lang-btn {
  width: 36px; height: 36px;
  border: 2px solid rgba(0, 212, 255, 0.4);
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(22, 27, 34, 0.9), rgba(33, 38, 45, 0.9));
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; color: #e6edf3;
  transition: all 0.3s ease;
  position: relative; overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}
.lang-btn::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  opacity: 0; transition: opacity 0.3s ease;
}
.lang-btn:hover {
  transform: scale(1.1);
  border-color: var(--accent-cyan);
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(168, 85, 247, 0.15));
  box-shadow: 0 0 15px rgba(0, 212, 255, 0.4);
}
.lang-btn.active {
  border-color: var(--accent-cyan);
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.2), rgba(168, 85, 247, 0.2));
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
}
.lang-btn.active::before { opacity: 0.3; }
.lang-btn span { position: relative; z-index: 1; }
.lang-btn[data-lang="ja"] span { font-family: 'Noto Sans JP', sans-serif; }
.lang-btn[data-lang="zh"] span { font-family: 'Noto Sans SC', sans-serif; }
.lang-btn[data-lang="ko"] span { font-family: 'Noto Sans KR', sans-serif; }
.lang-btn[data-lang="en"] span { font-family: 'JetBrains Mono', monospace; font-size: 11px; }

/* --- コンテナ --- */
.trends-container { position: relative; z-index: 1; max-width: 960px; margin: 0 auto; padding: 24px 16px 64px; }

/* ヘッダー：トップページと同じグラデーションボックス＋回転する光の演出 */
.trends-header {
  text-align: center;
  margin-bottom: 28px;
  padding: 30px 20px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(168, 85, 247, 0.1));
  border: 1px solid var(--border);
  border-radius: 16px;
  position: relative;
  overflow: hidden;
}
.trends-header::before {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: conic-gradient(from 0deg, transparent, rgba(0, 212, 255, 0.1), transparent 30%);
  animation: trends-rotate 20s linear infinite;
}
@keyframes trends-rotate { to { transform: rotate(360deg); } }
.trends-header > * { position: relative; z-index: 1; }
.trends-header h1 {
  font-family: "Orbitron", sans-serif;
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 900;
  letter-spacing: 0.1em;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-green), var(--accent-purple));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: var(--glow) rgba(0, 212, 255, 0.3);
  margin-bottom: 8px;
}
.trends-header .lead { color: var(--text-muted); font-size: 0.95rem; }
.trends-generated { color: var(--text-muted); font-size: 0.75rem; margin-top: 6px; }

/* --- タブ --- */
.trends-tabs {
  display: flex; flex-wrap: wrap; gap: 8px;
  justify-content: center; margin-bottom: 24px;
}
.trends-tab {
  padding: 9px 18px; border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--bg-card); color: var(--text-muted);
  font-family: inherit; font-size: 0.85rem; cursor: pointer;
  transition: all 0.15s;
}
.trends-tab:hover { color: var(--text); border-color: var(--accent-cyan); }
.trends-tab.active {
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.2), rgba(168, 85, 247, 0.2));
  color: var(--text); border-color: var(--accent-cyan);
}

/* サブタブ（カテゴリ期間切替など） */
.trends-subtabs {
  display: flex; flex-wrap: wrap; gap: 6px;
  justify-content: center; margin-bottom: 20px;
}
.trends-subtab {
  padding: 5px 12px; border-radius: 14px;
  border: 1px solid var(--border);
  background: transparent; color: var(--text-muted);
  font-family: inherit; font-size: 0.78rem; cursor: pointer;
}
.trends-subtab.active { color: var(--accent-cyan); border-color: var(--accent-cyan); }

/* --- ランキングカード --- */
.ranking-list { display: flex; flex-direction: column; gap: 10px; }

.ranking-card {
  display: grid;
  grid-template-columns: 48px 56px 1fr auto;
  align-items: center; gap: 12px;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: transform 0.12s, border-color 0.12s;
  cursor: pointer;
  text-decoration: none; color: inherit;
}
.ranking-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-cyan);
  text-decoration: none;
}
.ranking-rank {
  font-family: "Orbitron", sans-serif;
  font-size: 1.3rem; font-weight: 700;
  text-align: center; color: var(--text-muted);
}
.ranking-card:nth-child(1) .ranking-rank { color: #ffd700; }
.ranking-card:nth-child(2) .ranking-rank { color: #c0c0c0; }
.ranking-card:nth-child(3) .ranking-rank { color: #cd7f32; }

.ranking-symbol {
  width: 52px; height: 52px;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
}
.ranking-symbol .sym { font-size: 1.3rem; font-weight: 700; line-height: 1; }
.ranking-symbol .z { font-size: 0.6rem; color: var(--text-muted); }

.ranking-info { min-width: 0; }
.ranking-name { font-size: 1rem; font-weight: 600; }
.ranking-name-en { font-size: 0.72rem; color: var(--text-muted); }
.ranking-chips { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 4px; }
.ranking-chip {
  font-size: 0.62rem; padding: 1px 7px; border-radius: 10px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.25);
  color: var(--accent-cyan);
}

.ranking-metrics { text-align: right; white-space: nowrap; }
.ranking-count {
  font-family: "Orbitron", sans-serif;
  font-size: 1.1rem; color: var(--accent-green);
}
.ranking-count-label { font-size: 0.6rem; color: var(--text-muted); }
.ranking-sub { font-size: 0.72rem; margin-top: 2px; }

/* 変動・成長率の色 */
.change-up { color: var(--accent-green); }
.change-down { color: var(--accent-red); }
.change-same { color: var(--text-muted); }
.change-new {
  color: var(--accent-orange); font-weight: 700; font-size: 0.62rem;
  border: 1px solid var(--accent-orange); border-radius: 8px; padding: 0 5px;
}
.growth-positive { color: var(--accent-green); }
.growth-negative { color: var(--accent-red); }

/* --- カテゴリ別グリッド --- */
.category-groups { display: flex; flex-direction: column; gap: 28px; }
.category-block h2 {
  font-size: 1rem; margin-bottom: 12px;
  padding-left: 10px; border-left: 3px solid var(--accent-purple);
}
.category-block .ranking-card { grid-template-columns: 40px 48px 1fr auto; }

/* --- 空状態・読み込み --- */
.trends-empty, .trends-loading {
  text-align: center; padding: 48px 16px; color: var(--text-muted);
}
.trends-loading::after {
  content: ""; display: inline-block;
  width: 22px; height: 22px; margin-left: 10px;
  border: 3px solid var(--border);
  border-top-color: var(--accent-cyan);
  border-radius: 50%; animation: trend-spin 0.8s linear infinite;
  vertical-align: middle;
}
@keyframes trend-spin { to { transform: rotate(360deg); } }

/* --- 元素別詳細ビュー --- */
.element-detail-head {
  display: flex; align-items: center; gap: 18px;
  flex-wrap: wrap; margin-bottom: 24px;
  padding: 20px; border: 1px solid var(--border);
  border-radius: 16px; background: var(--bg-card);
}
.element-detail-symbol {
  width: 84px; height: 84px; border-radius: 16px;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
}
.element-detail-symbol .sym { font-size: 2.2rem; font-weight: 700; line-height: 1; }
.element-detail-symbol .z { font-size: 0.75rem; color: var(--text-muted); }
.element-detail-meta h1 { font-size: 1.6rem; margin-bottom: 2px; }
.element-detail-meta .en { color: var(--text-muted); font-size: 0.85rem; }

.element-stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px; margin-bottom: 24px;
}
.element-stat {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 12px; padding: 14px; text-align: center;
}
.element-stat .value {
  font-family: "Orbitron", sans-serif; font-size: 1.4rem;
  color: var(--accent-cyan);
}
.element-stat .label { font-size: 0.7rem; color: var(--text-muted); margin-top: 4px; }

.chart-panel {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 16px; padding: 18px; margin-bottom: 24px;
}
.chart-panel h2 { font-size: 0.95rem; margin-bottom: 14px; }
.chart-wrap { position: relative; height: 300px; }

.back-link { display: inline-block; margin-bottom: 18px; font-size: 0.85rem; }

/* --- プライバシー注記 --- */
.trends-note {
  margin-top: 40px; padding: 16px;
  border: 1px solid var(--border); border-radius: 12px;
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-muted); font-size: 0.78rem; line-height: 1.7;
}

/* --- SEO説明文 --- */
.trends-about {
  margin-top: 28px; color: var(--text-muted);
  font-size: 0.82rem; line-height: 1.9;
}
.trends-about h2 { font-size: 1rem; color: var(--text); margin-bottom: 8px; }

footer.trends-footer {
  position: relative; z-index: 1;
  text-align: center; padding: 28px 16px;
  color: var(--text-muted); font-size: 0.78rem;
  border-top: 1px solid var(--border); margin-top: 40px;
}

/* --- レスポンシブ --- */
@media (max-width: 560px) {
  .lang-switcher { top: 8px; right: 8px; padding: 4px; gap: 3px; }
  .lang-btn { width: 30px; height: 30px; font-size: 12px; }
  .lang-btn[data-lang="en"] span { font-size: 10px; }
  .trends-nav { justify-content: flex-start; padding-right: 140px; min-height: 44px; }
  .ranking-card { grid-template-columns: 36px 46px 1fr auto; gap: 8px; padding: 10px 12px; }
  .ranking-symbol { width: 44px; height: 44px; }
  .ranking-symbol .sym { font-size: 1.1rem; }
  .ranking-name { font-size: 0.9rem; }
  .ranking-count { font-size: 0.95rem; }
  .element-detail-head { gap: 12px; padding: 16px; }
  .element-detail-symbol { width: 68px; height: 68px; }
  .element-detail-symbol .sym { font-size: 1.8rem; }
}