/* PeriodicTable - 主样式表 */
/* 参考 ptable.top 视觉设计 */

:root {
  --bg-primary:    #0f172a;
  --bg-secondary:  #1e293b;
  --bg-card:       #1e293b;
  --bg-hover:      #334155;
  --text-primary:  #f1f5f9;
  --text-secondary:#94a3b8;
  --text-muted:    #64748b;
  --border-color:  #334155;
  --accent:        #3b82f6;
  --accent-hover:  #2563eb;

  /* 分类颜色 */
  --cat-alkali:      #ef4444;
  --cat-alkaline:    #f97316;
  --cat-transition:  #eab308;
  --cat-post:        #84cc16;
  --cat-metalloid:   #14b8a6;
  --cat-nonmetal:    #a855f7;
  --cat-halogen:     #06b6d4;
  --cat-noble:       #6366f1;
  --cat-lanthanide:  #ec4899;
  --cat-actinide:    #64748b;

  /* 物态颜色 */
  --state-solid:   #94a3b8;
  --state-liquid:  #38bdf8;
  --state-gas:     #fb923c;
  --state-unknown: #475569;
}

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

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

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Noto Sans SC', sans-serif;
  line-height: 1.5;
  min-height: 100vh;
}

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

/* ===== 导航栏 ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15,23,42,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  height: 56px;
  display: flex;
  align-items: center;
  padding: 0 20px;
}

.nav-inner {
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  margin-right: 20px;
  flex-shrink: 0;
}

.nav-logo .logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #3b82f6, #6366f1);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.nav-link {
  padding: 6px 12px;
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.15s;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.nav-compare-badge {
  background: var(--accent);
  color: #fff;
  border-radius: 10px;
  padding: 1px 6px;
  font-size: 0.7rem;
  margin-left: 4px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.lang-btn {
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s;
}

.lang-btn:hover,
.lang-btn.active {
  border-color: var(--accent);
  color: var(--text-primary);
}

/* ===== 主内容区域 ===== */
.main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.page-title {
  text-align: center;
  margin-bottom: 24px;
}

.page-title h1 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
}

.page-title p {
  color: var(--text-secondary);
  margin-top: 6px;
  font-size: 0.9rem;
}

/* ===== 分类筛选栏 ===== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
  align-items: center;
}

.filter-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 20px;
  border: 2px solid transparent;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
  transition: all 0.15s;
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.filter-btn .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.filter-btn:hover { border-color: var(--bg-hover); color: var(--text-primary); }
.filter-btn.active { border-color: currentColor; color: var(--text-primary); }

.filter-btn[data-cat="all"]         { color: #e2e8f0; }
.filter-btn[data-cat="alkali_metal"]     .dot { background: var(--cat-alkali); }
.filter-btn[data-cat="alkaline_earth"]   .dot { background: var(--cat-alkaline); }
.filter-btn[data-cat="transition_metal"] .dot { background: var(--cat-transition); }
.filter-btn[data-cat="post_transition"]  .dot { background: var(--cat-post); }
.filter-btn[data-cat="metalloid"]        .dot { background: var(--cat-metalloid); }
.filter-btn[data-cat="nonmetal"]         .dot { background: var(--cat-nonmetal); }
.filter-btn[data-cat="halogen"]          .dot { background: var(--cat-halogen); }
.filter-btn[data-cat="noble_gas"]        .dot { background: var(--cat-noble); }
.filter-btn[data-cat="lanthanide"]       .dot { background: var(--cat-lanthanide); }
.filter-btn[data-cat="actinide"]         .dot { background: var(--cat-actinide); }

/* ===== 控制面板（热力图+温度+时间线） ===== */
.controls-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px 20px;
  margin-bottom: 20px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
  align-items: end;
}

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

.ctrl-group label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.ctrl-group .ctrl-title {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

select.ctrl-select {
  width: 100%;
  padding: 8px 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  outline: none;
}

select.ctrl-select:focus { border-color: var(--accent); }

.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.ctrl-slider {
  flex: 1;
  -webkit-appearance: none;
  height: 4px;
  border-radius: 2px;
  background: var(--border-color);
  outline: none;
  cursor: pointer;
}

.ctrl-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  transition: transform 0.1s;
}

.ctrl-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }

.ctrl-value {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  min-width: 60px;
  text-align: right;
}

.state-indicators {
  display: flex;
  gap: 12px;
  margin-top: 6px;
  font-size: 0.75rem;
}

.state-dot {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--text-secondary);
}

.state-dot::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.state-dot.solid::before  { background: var(--state-solid); }
.state-dot.liquid::before { background: var(--state-liquid); }
.state-dot.gas::before    { background: var(--state-gas); }

.reset-btn {
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.reset-btn:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

/* ===== 周期表主体 ===== */
.pt-wrapper {
  overflow-x: auto;
  padding-bottom: 8px;
}

.pt-grid {
  display: grid;
  grid-template-columns: repeat(18, minmax(52px, 1fr));
  grid-template-rows: repeat(9, auto);
  gap: 3px;
  min-width: 960px;
}

/* 元素卡片 */
.el-card {
  aspect-ratio: 1 / 1.1;
  border-radius: 6px;
  padding: 4px 3px 3px;
  cursor: pointer;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: transform 0.12s, box-shadow 0.12s, opacity 0.2s;
  border: 2px solid transparent;
  overflow: hidden;
  min-height: 54px;
}

.el-card:hover {
  transform: scale(1.12);
  z-index: 10;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
  border-color: rgba(255,255,255,0.3);
}

.el-card.dimmed { opacity: 0.15; }
.el-card.highlighted { opacity: 1; }

.el-num {
  font-size: 0.6rem;
  color: rgba(255,255,255,0.6);
  line-height: 1;
  align-self: flex-start;
  padding-left: 2px;
}

.el-sym {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.el-name-zh {
  font-size: 0.62rem;
  color: rgba(255,255,255,0.85);
  line-height: 1.2;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.el-name-en {
  font-size: 0.52rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.2;
  display: none;
}

/* 物态指示器覆盖 */
.el-card.state-mode .el-card-inner::after {
  content: '';
  position: absolute;
  bottom: 2px;
  right: 3px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.el-card.is-solid   { border-bottom-color: var(--state-solid) !important; }
.el-card.is-liquid  { border-bottom-color: var(--state-liquid) !important; border-bottom-width: 3px; }
.el-card.is-gas     { border-bottom-color: var(--state-gas) !important; border-bottom-width: 3px; }
.el-card.is-unknown { border-bottom-color: var(--state-unknown) !important; }

/* 分类颜色 */
.cat-alkali_metal     { background: linear-gradient(135deg, #ef4444cc, #dc2626bb); }
.cat-alkaline_earth   { background: linear-gradient(135deg, #f97316cc, #ea580cbb); }
.cat-transition_metal { background: linear-gradient(135deg, #ca8a04cc, #a16207bb); }
.cat-post_transition  { background: linear-gradient(135deg, #65a30dcc, #4d7c0fbb); }
.cat-metalloid        { background: linear-gradient(135deg, #0d9488cc, #0f766ebb); }
.cat-nonmetal         { background: linear-gradient(135deg, #9333eacc, #7e22cebb); }
.cat-halogen          { background: linear-gradient(135deg, #0891b2cc, #0e7490bb); }
.cat-noble_gas        { background: linear-gradient(135deg, #4f46e5cc, #4338cabb); }
.cat-lanthanide       { background: linear-gradient(135deg, #db2777cc, #be185dbb); }
.cat-actinide         { background: linear-gradient(135deg, #475569cc, #334155bb); }

/* 热力图模式下的颜色由JS动态设置 */
.el-card.heatmap-mode { transition: background 0.3s; }

/* 周期标签 */
.period-label {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* 族标签行 */
.group-label-row {
  display: grid;
  grid-template-columns: repeat(18, minmax(52px, 1fr));
  gap: 3px;
  min-width: 960px;
  margin-bottom: 6px;
}

.group-label {
  text-align: center;
  font-size: 0.7rem;
  color: var(--text-muted);
  padding: 2px 0;
}

/* 镧系/锕系占位符 */
.lanthanide-placeholder,
.actinide-placeholder {
  border-radius: 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  color: rgba(255,255,255,0.7);
  cursor: default;
  padding: 4px;
  text-align: center;
  min-height: 54px;
  aspect-ratio: 1 / 1.1;
}

.lanthanide-placeholder { background: linear-gradient(135deg, #db2777cc, #be185dbb); }
.actinide-placeholder   { background: linear-gradient(135deg, #475569cc, #334155bb); }

/* 行间隔 */
.pt-spacer {
  grid-column: 1 / -1;
  height: 8px;
}

/* 热力图色阶说明 */
.heatmap-legend {
  display: none;
  align-items: center;
  gap: 10px;
  margin: 12px 0;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.heatmap-legend.visible { display: flex; }

.heatmap-bar {
  flex: 1;
  max-width: 300px;
  height: 12px;
  border-radius: 6px;
  background: linear-gradient(to right, #1e3a5f, #2563eb, #22c55e, #fbbf24, #ef4444);
}

/* ===== 分类说明区块 ===== */
.categories-section {
  margin-top: 40px;
}

.section-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.cat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 16px;
  border-left-width: 4px;
}

.cat-card-title {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.cat-card-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.cat-card-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== 对比区 ===== */
.compare-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px 20px;
  margin-top: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.compare-section h3 {
  font-size: 0.95rem;
  color: var(--text-primary);
}

.compare-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  flex: 1;
}

.compare-chip {
  background: var(--bg-hover);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 0.8rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.compare-chip .rm-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 0;
}

.compare-chip .rm-btn:hover { color: #ef4444; }

.compare-actions {
  display: flex;
  gap: 8px;
}

.btn-primary {
  padding: 8px 16px;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: background 0.15s;
}

.btn-primary:hover { background: var(--accent-hover); color: #fff; }

.btn-ghost {
  padding: 8px 16px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-ghost:hover { border-color: var(--accent); color: var(--text-primary); }

/* ===== 文章区 ===== */
.articles-section { margin-top: 40px; }

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 16px;
}

.article-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
  transition: transform 0.15s, border-color 0.15s;
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.article-cover {
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
}

.article-body {
  padding: 16px;
  flex: 1;
}

.article-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
}

.article-summary {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.article-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
}

.article-more {
  font-size: 0.8rem;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ===== 元素详情页 ===== */
.element-detail {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 768px) {
  .element-detail { grid-template-columns: 1fr; }
}

.el-big-card {
  border-radius: 16px;
  padding: 32px 24px;
  text-align: center;
  position: sticky;
  top: 72px;
}

.el-big-number {
  font-size: 1rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 8px;
}

.el-big-sym {
  font-size: 5rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

.el-big-name-zh {
  font-size: 1.4rem;
  color: rgba(255,255,255,0.9);
  margin-top: 8px;
}

.el-big-name-en {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  margin-top: 4px;
}

.el-big-mass {
  font-size: 1.1rem;
  font-weight: 600;
  color: rgba(255,255,255,0.85);
  margin-top: 12px;
}

.el-big-cat {
  display: inline-block;
  margin-top: 10px;
  padding: 4px 14px;
  border-radius: 20px;
  background: rgba(255,255,255,0.15);
  font-size: 0.78rem;
  color: rgba(255,255,255,0.8);
}

.el-nav-btns {
  display: flex;
  gap: 8px;
  margin-top: 20px;
  justify-content: center;
}

.el-nav-btn {
  padding: 6px 14px;
  border-radius: 8px;
  background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.8);
  font-size: 0.82rem;
  text-decoration: none;
  transition: background 0.15s;
}

.el-nav-btn:hover { background: rgba(255,255,255,0.2); color: #fff; }
.el-nav-btn.disabled { opacity: 0.3; pointer-events: none; }

.detail-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
}

.detail-section h3 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.props-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.prop-item label {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: block;
  margin-bottom: 2px;
}

.prop-item .val {
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 500;
}

.electron-config {
  font-family: monospace;
  font-size: 1rem;
  color: var(--accent);
  letter-spacing: 0.05em;
  background: var(--bg-primary);
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

/* ===== 对比工具页 ===== */
.compare-table-wrapper {
  overflow-x: auto;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
}

.compare-table th,
.compare-table td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.875rem;
}

.compare-table th {
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--bg-secondary);
  position: sticky;
  top: 56px;
}

.compare-table td { color: var(--text-secondary); }
.compare-table .prop-label { color: var(--text-muted); font-size: 0.8rem; }
.compare-table .el-sym-cell {
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
}

.compare-table tr:hover td { background: rgba(255,255,255,0.03); }

/* ===== 配平工具 ===== */
.balancer-form {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 24px;
  max-width: 700px;
  margin: 0 auto;
}

.balancer-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: monospace;
  outline: none;
  transition: border-color 0.15s;
}

.balancer-input:focus { border-color: var(--accent); }

.balancer-result {
  margin-top: 20px;
  padding: 16px;
  background: var(--bg-primary);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  font-size: 1.1rem;
  font-family: monospace;
  color: var(--text-primary);
  min-height: 50px;
}

/* ===== 记忆卡 ===== */
.flashcard-container {
  perspective: 1000px;
  max-width: 400px;
  margin: 40px auto;
}

.flashcard {
  width: 100%;
  aspect-ratio: 4/3;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

.flashcard.flipped { transform: rotateY(180deg); }

.flashcard-face {
  position: absolute;
  inset: 0;
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  backface-visibility: hidden;
  padding: 24px;
}

.flashcard-front {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
}

.flashcard-back {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  transform: rotateY(180deg);
}

.fc-sym {
  font-size: 5rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
}

.fc-num {
  font-size: 1rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.fc-name-zh {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.fc-name-en {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-top: 6px;
}

.fc-hint {
  margin-top: 20px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.flashcard-controls {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 24px;
}

.fc-progress {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 12px;
}

/* ===== 速查表 ===== */
.reference-table-wrapper {
  overflow-x: auto;
  overflow-y: auto;
  max-height: calc(100vh - 180px);
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.reference-table {
  width: 100%;
  border-collapse: collapse;
}

.reference-table th,
.reference-table td {
  padding: 8px 12px;
  text-align: right;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.8rem;
  white-space: nowrap;
}

.reference-table th {
  background: var(--bg-secondary);
  color: var(--text-muted);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  position: sticky;
  top: 0;
  z-index: 10;
}

.reference-table td:first-child,
.reference-table th:first-child { text-align: left; }
.reference-table td:nth-child(2),
.reference-table th:nth-child(2) { text-align: center; }
.reference-table td:nth-child(3),
.reference-table th:nth-child(3) { text-align: center; }

.reference-table td { color: var(--text-secondary); }
.reference-table td.sym { font-weight: 700; color: var(--text-primary); font-size: 0.95rem; }

.reference-table tr:hover td { background: rgba(255,255,255,0.03); }

.ref-search {
  width: 100%;
  max-width: 400px;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.875rem;
  outline: none;
  margin-bottom: 16px;
}

.ref-search:focus { border-color: var(--accent); }

/* ===== 文章页 ===== */
.article-content {
  max-width: 760px;
  margin: 0 auto;
}

.article-content h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 28px 0 14px;
  border-left: 4px solid var(--accent);
  padding-left: 12px;
}

.article-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 22px 0 10px;
}

.article-content p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 14px;
  font-size: 0.95rem;
}

.article-content strong { color: var(--text-primary); }

.article-content ul, .article-content ol {
  padding-left: 24px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 14px;
  font-size: 0.95rem;
}

/* ===== 页脚 ===== */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 32px 20px;
  margin-top: 60px;
  text-align: center;
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-links {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.82rem;
  transition: color 0.15s;
}

.footer-links a:hover { color: var(--text-primary); }

.footer-copy {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ===== 工具提示 ===== */
.tooltip {
  position: fixed;
  z-index: 1000;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 10px 14px;
  pointer-events: none;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  max-width: 200px;
  font-size: 0.8rem;
}

.tooltip-sym {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
}

.tooltip-name {
  color: var(--text-secondary);
  font-size: 0.82rem;
}

.tooltip-props {
  margin-top: 6px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .nav-links .nav-link:not(.active) { display: none; }
  .controls-panel { grid-template-columns: 1fr; }
  .props-grid { grid-template-columns: 1fr; }
  .articles-grid { grid-template-columns: 1fr; }

  .el-sym  { font-size: 1rem; }
  .el-name-zh { display: none; }
  .el-num { font-size: 0.55rem; }
}

/* ===== 动画 ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-in { animation: fadeIn 0.3s ease; }

.heatmap-bar-container {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 0 16px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.heatmap-gradient-bar {
  flex: 1;
  height: 8px;
  border-radius: 4px;
}