/* ============================================================
   世界时钟 —— 浅色青蓝主题（对齐站点设计变量）
   对应模板：content/world-clock.html；初始数据来自页面内 #wc-data 的 SSR JSON，
   走表 / 切洲 / 换算等交互由 static/js/world-clock.js 驱动。
   文件按源码顺序分两层：前半为基础样式，文末「深度美化层」与 .wc-hero--night
   （北京入夜后由 JS 切换的深空变体）按级联顺序覆盖前面的同名规则。
   ============================================================ */

/* ─────────────────── Hero ─────────────────── */
.wc-hero {
  position: relative;
  overflow: hidden;
  margin: 0 0 26px;
  padding: 28px 40px 0;
  border-radius: var(--radius-16);
  background:
    radial-gradient(ellipse at 85% 12%, rgba(78, 205, 196, 0.16), transparent 42%),
    radial-gradient(ellipse at 8% 108%, rgba(52, 152, 219, 0.12), transparent 45%),
    linear-gradient(135deg, #eefaf5 0%, #ecf5ff 52%, #f4fbf0 100%);
  border: 1px solid rgba(52, 152, 219, 0.16);
  box-shadow: 0 14px 38px -18px rgba(52, 152, 219, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

/* 浅色经纬网格纹理（青蓝调） */
.wc-hero-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(0deg, rgba(52, 152, 219, 0.05) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(90deg, rgba(52, 152, 219, 0.05) 0 1px, transparent 1px 88px),
    radial-gradient(ellipse at 50% -16%, rgba(78, 205, 196, 0.14), transparent 55%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.18));
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.18));
}

/* 浅色下星空装饰不可见，隐藏 */
.wc-hero .wc-stars {
  display: none;
}

/* 右上角：旋转时钟刻度圆环（装饰） */
.wc-hero::before {
  content: '';
  position: absolute;
  right: -80px;
  top: -110px;
  width: 270px;
  height: 270px;
  border-radius: 50%;
  background: repeating-conic-gradient(from 0deg, rgba(52, 152, 219, 0.5) 0deg 2deg, transparent 2deg 15deg);
  -webkit-mask-image: radial-gradient(circle, transparent 58%, #000 58%, #000 64%, transparent 64%);
  mask-image: radial-gradient(circle, transparent 58%, #000 58%, #000 64%, transparent 64%);
  opacity: 0.4;
  animation: wcHeroRingSpin 90s linear infinite;
}

@keyframes wcHeroRingSpin {
  to { transform: rotate(360deg); }
}

/* 底部渐变分隔线（青→蓝） */
.wc-hero::after {
  content: '';
  position: absolute;
  left: 10%;
  right: 10%;
  bottom: 0;
  height: 2px;
  border-radius: var(--radius-2);
  background: linear-gradient(90deg, transparent, rgba(78, 205, 196, 0.45), rgba(52, 152, 219, 0.4), transparent);
}

.wc-stars {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1.4px 1.4px at 22px 34px, rgba(255, 255, 255, 0.85), transparent 60%),
    radial-gradient(1.2px 1.2px at 112px 76px, rgba(255, 255, 255, 0.7), transparent 60%),
    radial-gradient(1.5px 1.5px at 198px 24px, rgba(255, 255, 255, 0.9), transparent 60%),
    radial-gradient(1px 1px at 268px 118px, rgba(255, 255, 255, 0.6), transparent 60%),
    radial-gradient(1.3px 1.3px at 330px 52px, rgba(255, 255, 255, 0.8), transparent 60%),
    radial-gradient(1.1px 1.1px at 60px 150px, rgba(255, 255, 255, 0.55), transparent 60%),
    radial-gradient(1.2px 1.2px at 150px 190px, rgba(255, 255, 255, 0.65), transparent 60%),
    radial-gradient(1.4px 1.4px at 300px 200px, rgba(255, 255, 255, 0.5), transparent 60%);
  animation: wcTwinkle 3.6s ease-in-out infinite alternate;
}

@keyframes wcTwinkle {
  from { opacity: 0.55; }
  to { opacity: 1; }
}

.wc-hero-inner {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-20) 56px; padding-bottom: var(--space-16);
}

.wc-hero-info {
  text-align: center;
}

/* hero 底部数据条 */
.wc-hero-stats {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-8) var(--space-20);
  margin: 0 0 18px;
  padding: var(--space-8) var(--space-16);
  border-radius: var(--radius-12);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(52, 152, 219, 0.16);
  font-size: var(--fs-12);
  color: var(--text-secondary);
}

.wc-hero-stat {
  display: inline-flex;
  align-items: center;
  gap: var(--space-6);
}

.wc-hero-stat b {
  font-size: var(--fs-14);
  color: #146a7a;
  font-variant-numeric: tabular-nums;
}

.wc-hs-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.wc-hs-dot-day {
  background: #ffd76a;
  box-shadow: 0 0 7px rgba(255, 215, 106, 0.85);
}

.wc-hs-dot-night {
  background: #7fa4ff;
  box-shadow: 0 0 7px rgba(127, 164, 255, 0.75);
}

.wc-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-4) var(--space-12);
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, rgba(78, 205, 196, 0.14), rgba(52, 152, 219, 0.12));
  border: 1px solid rgba(52, 152, 219, 0.28);
  color: #146a7a;
  font-size: var(--fs-12);
  font-weight: 600;
  letter-spacing: 0.4px;
}

.wc-hero-badge::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4ecdc4;
  box-shadow: 0 0 9px rgba(78, 205, 196, 0.9);
  animation: wc-badge-pulse 2.2s ease-in-out infinite;
}

@keyframes wc-badge-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.72); }
}

.wc-hero-title {
  margin: 10px 0 4px;
  font-size: var(--fs-h1);
  font-weight: 800;
  letter-spacing: 1.5px;
  color: #0e7a72;
  background: linear-gradient(90deg, #0e7a72, #2b6cb0);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.wc-hero-sub {
  margin: 0;
  color: var(--text-muted);
  font-size: var(--fs-13);
}

.wc-hero-city {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: var(--space-8); padding-right: 38px; /* 给右上角太阳/月亮角标让位，避免遮挡时区信息 */
  margin-bottom: var(--space-6);
}

.wc-hero-city-name {
  font-size: var(--fs-17);
  font-weight: 700;
}

.wc-hero-city-zone {
  padding: var(--space-2) var(--space-8);
  border-radius: var(--radius-6);
  background: rgba(52, 152, 219, 0.08);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--fs-11); /* 略小一号，保证「城市名 + 时区」在卡片内一行放下 */
}

.wc-hero-city-offset {
  margin-top: var(--space-4);
  margin-left: auto;
  width: fit-content; /* 时区偏移徽章独占一行、靠右，两张卡片头部结构一致且避开右上角角标 */
  padding: var(--space-2) var(--space-8);
  border-radius: var(--radius-6);
  background: rgba(52, 152, 219, 0.1);
  border: 1px solid rgba(52, 152, 219, 0.28);
  color: #146a7a;
  font-family: var(--font-mono);
  font-size: var(--fs-11);
  font-weight: 600;
}

.wc-hero-time {
  font-family: var(--font-mono);
  font-size: 44px;
  font-weight: 700;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  letter-spacing: 1.5px;
  color: #14718f;
  margin-top: var(--space-10); /* 与上方时区徽章拉开距离 */
}

.wc-hero-date {
  margin-top: var(--space-8);
  font-size: var(--fs-13);
  font-variant-numeric: tabular-nums;
}

/* 双时钟：格林威治（副） + 北京（主） */
.wc-hero-clocks {
  display: flex;
  align-items: stretch; gap: var(--space-16);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.wc-hero-clock {
  flex: 1 1 0;
  min-width: 340px; /* 两卡等宽：宽度超过「城市+时区」行的内容需求，保证一行放下且不被角标遮挡 */
  text-align: right; padding: var(--space-12) var(--space-28) ; /* 右侧 28px：滚动时间与卡片外缘留出间距 */
  border-radius: var(--radius-16);
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(52, 152, 219, 0.24);
  box-shadow: 0 8px 22px -10px rgba(52, 152, 219, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.wc-hero-clock-utc {
  min-width: 340px;
  border-color: rgba(78, 205, 196, 0.35);
  background: rgba(232, 250, 245, 0.92);
}

.wc-hero-clock-utc .wc-hero-time {
  font-size: 40px;
  color: #0f8a85;
  text-shadow: none;
}

.wc-hero-clock-utc .wc-hero-city-zone,
.wc-hero-clock-utc .wc-hero-city-offset {
  color: #1f6f8f;
}

.wc-hero-clock-utc .wc-hero-city-name {
  color: #0f8a85;
}

/* 北京时间卡片（后位，天蓝主题与 UTC 青绿区分） */
.wc-hero-clock-beijing {
  min-width: 340px;
  border-color: rgba(52, 152, 219, 0.3);
  background: rgba(238, 246, 255, 0.92);
}

.wc-hero-clock-beijing .wc-hero-time {
  font-size: 40px;
  color: #1a6fa0;
  text-shadow: none;
}

.wc-hero-clock-beijing .wc-hero-city-name {
  color: #1a6fa0;
}

/* ─────────────────── 通用区块 ─────────────────── */
.wc-section { margin-bottom: var(--space-24); padding: var(--space-24) ;
  background: var(--bg-card);
  border-radius: var(--radius-12);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.wc-section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-6) var(--space-16); margin-bottom: var(--space-16);
}

.wc-section-title {
  margin: 0;
  font-size: var(--fs-18);
  font-weight: 700;
  color: var(--text-primary);
}

.wc-section-desc {
  margin: 0;
  font-size: var(--fs-12);
  color: var(--text-muted);
}

/* ─────────────────── 昼夜地图 ─────────────────── */
.wc-map-wrap {
  position: relative;
  border-radius: var(--radius-12);
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: #0a1024;
}

#wcMap {
  display: block;
  width: 100%;
  height: auto;
  cursor: grab;
  touch-action: none;
}

#wcMap:active {
  cursor: grabbing;
}

/* 地图缩放控件（右上角） */
.wc-map-zoom {
  position: absolute;
  top: var(--space-12);
  right: var(--space-12);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  z-index: 4;
}

.wc-zoom-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-8);
  border: 1px solid rgba(140, 190, 255, 0.35);
  background: rgba(10, 16, 36, 0.8);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  color: #dceaff;
  font-size: var(--fs-17);
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s, transform 0.15s;
}

.wc-zoom-btn:hover {
  background: rgba(60, 100, 190, 0.55);
  transform: scale(1.06);
}

.wc-zoom-btn:active {
  transform: scale(0.95);
}

.wc-map-legend {
  position: absolute;
  left: var(--space-12);
  bottom: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center; gap: var(--space-12);
  padding: var(--space-6) var(--space-12);
  border-radius: var(--radius-8);
  background: rgba(10, 16, 36, 0.72);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  color: rgba(255, 255, 255, 0.85);
  font-size: var(--fs-11);
}

.wc-map-legend span {
  display: inline-flex;
  align-items: center; gap: var(--space-4);
}

.wc-map-hint {
  color: rgba(255, 255, 255, 0.45);
}

/* 城市光点 hover 信息浮层 */
.wc-map-tip {
  position: absolute;
  z-index: 5;
  min-width: 216px;
  padding: var(--space-10) var(--space-12);
  border-radius: var(--radius-12);
  background: rgba(9, 15, 34, 0.92);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(130, 180, 255, 0.35);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  color: #eaf2ff;
  font-size: var(--fs-12);
  line-height: var(--lh-ui);
  pointer-events: none;
  white-space: nowrap;
}

.wc-map-tip-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-10); margin-bottom: var(--space-2);
}

.wc-map-tip-city {
  font-size: var(--fs-14);
  font-weight: 700;
  color: #fff;
}

.wc-map-tip-offset {
  font-size: var(--fs-11);
  color: #7fd4a8;
  font-family: var(--font-mono);
}

.wc-map-tip-zone {
  font-size: var(--fs-11);
  color: rgba(220, 235, 255, 0.72);
  font-family: var(--font-mono);
  margin-bottom: var(--space-4);
}

.wc-map-tip-time {
  font-size: var(--fs-17);
  font-weight: 700;
  font-family: var(--font-mono);
  color: #ffd76a;
  letter-spacing: 1px;
}

.wc-map-tip-day {
  font-size: var(--fs-11);
  color: rgba(220, 235, 255, 0.85);
}

.wc-dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.wc-dot-day { background: #ffd76a; box-shadow: 0 0 8px rgba(255, 215, 106, 0.8); }
.wc-dot-night { background: #7fa4ff; box-shadow: 0 0 8px rgba(127, 164, 255, 0.7); }
.wc-dot-sun { background: #ff8a3d; box-shadow: 0 0 10px rgba(255, 138, 61, 0.9); }
.wc-dot-city { background: #ffffff; box-shadow: 0 0 6px rgba(255, 255, 255, 0.7); }

/* ─────────────────── 大洲 Tab 切换 ─────────────────── */
.wc-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  margin-bottom: var(--space-16);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid var(--border-light);
}

.wc-tab {
  display: inline-flex;
  align-items: center;
  gap: var(--space-6);
  padding: var(--space-6) var(--space-16);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  background: #ffffff;
  color: var(--text-secondary);
  font-size: var(--fs-13);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.wc-tab:hover {
  border-color: rgba(93, 151, 67, 0.4);
  color: var(--primary-dark);
}

.wc-tab i {
  font-style: normal;
  min-width: 20px;
  text-align: center;
  padding: 0 6px;
  border-radius: var(--radius-pill);
  background: rgba(93, 151, 67, 0.16);
  color: var(--primary-dark);
  font-size: var(--fs-11);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.wc-tab.is-active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: #fff;
  box-shadow: 0 3px 10px rgba(93, 151, 67, 0.3);
}

.wc-tab.is-active i {
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
}

.wc-tab-panel {
  display: none;
}

.wc-tab-panel.is-active {
  display: block;
}

/* ─────────────────── 城市卡片 ─────────────────── */
.wc-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(216px, 1fr)); gap: var(--space-12);
  /* 面板卡片在视口外时跳过渲染（懒加载 + 滚动优化） */
  content-visibility: auto;
  contain-intrinsic-size: auto 260px;
}

.wc-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-16) var(--space-12) var(--space-12);
  border-radius: var(--radius-12);
  border: 1px solid var(--border-color);
  background: linear-gradient(180deg, #ffffff, #fbfdf9);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.wc-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.wc-card-top {
  display: flex;
  align-items: baseline; gap: var(--space-6);
  width: 100%;
  justify-content: center;
  margin-bottom: var(--space-4);
}

.wc-card-city {
  font-size: var(--fs-15);
  font-weight: 700;
  color: var(--text-primary);
}

.wc-card-country {
  font-size: var(--fs-11);
  color: var(--text-muted);
}

.wc-analog-wrap {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  margin: 6px 0 2px;
}

.wc-analog {
  display: block;
  width: 100px;
  height: 100px;
}

.wc-analog-offset {
  padding: 1px var(--space-8);
  border-radius: var(--radius-pill);
  background: rgba(93, 151, 67, 0.12);
  border: 1px solid rgba(93, 151, 67, 0.28);
  color: var(--primary-dark);
  font-family: var(--font-mono);
  font-size: var(--fs-11);
  line-height: var(--lh-ui);
}

.wc-card-time {
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.5px;
}

.wc-card-date { margin-top: var(--space-2);
  font-size: var(--fs-11);
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.wc-card-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center; gap: var(--space-4);
  margin-top: var(--space-8);
}

.wc-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-8);
  border-radius: var(--radius-pill);
  font-size: var(--fs-11);
  font-weight: 500;
  white-space: nowrap;
}

.wc-badge-diff {
  background: rgba(93, 151, 67, 0.1);
  border: 1px solid rgba(93, 151, 67, 0.25);
  color: var(--primary-dark);
}

.wc-badge-utc {
  background: rgba(52, 152, 219, 0.1);
  border: 1px solid rgba(52, 152, 219, 0.3);
  color: #1a6fa8;
}

.wc-badge-date {
  background: rgba(230, 126, 34, 0.1);
  border: 1px solid rgba(230, 126, 34, 0.28);
  color: #c05f0a;
}

.wc-card-flag {
  position: absolute;
  top: var(--space-12);
  right: var(--space-12);
  font-size: var(--fs-11);
  font-weight: 600;
  padding: var(--space-2) var(--space-8);
  border-radius: var(--radius-pill);
}

.wc-card-flag.is-day {
  background: rgba(255, 190, 60, 0.14);
  color: #b07d12;
}

.wc-card-flag.is-night {
  background: rgba(90, 110, 220, 0.12);
  color: #4a5bc4;
}

.wc-empty {
  padding: 30px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: var(--fs-13);
}

/* ─────────────────── 24h 时间条 ─────────────────── */
.wc-timeline {
  padding: 4px 0 8px;
}

.wc-timeline-axis {
  position: relative;
  display: flex;
  flex-direction: column; gap: var(--space-6);
}

.wc-tl-row {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr) 112px;
  align-items: center;
  gap: var(--space-10);
  /* 视口外时间条跳过渲染 */
  content-visibility: auto;
  contain-intrinsic-size: auto 32px;
}

.wc-tl-city {
  text-align: left;
  font-size: var(--fs-12);
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.wc-tl-city small {
  display: block;
  font-weight: 400;
  color: var(--text-muted);
  font-size: var(--fs-11);
}

/* 时间条行内：轨道包裹层（时间标签不被轨道裁剪） */
.wc-tl-track-wrap {
  position: relative;
  min-width: 0;
}

.wc-tl-track {
  position: relative;
  height: 22px;
  border-radius: var(--radius-6);
  background: linear-gradient(90deg, #17204a 0%, #27407d 46%, #17204a 100%);
  overflow: hidden;
}

/* 每小时一根刻度线：4.1666% ≈ 1/24 轨道宽 */
.wc-tl-track::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(90deg, transparent 0, transparent calc(4.1666% - 1px), rgba(255, 255, 255, 0.09) calc(4.1666% - 1px), rgba(255, 255, 255, 0.09) 4.1666%);
}

.wc-tl-day {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(255, 211, 110, 0.5), rgba(255, 236, 170, 0.85) 50%, rgba(255, 211, 110, 0.5));
}

.wc-tl-marker {
  position: absolute;
  top: 1px;
  bottom: 1px;
  width: 2.6px;
  border-radius: var(--radius-2);
  background: #ff5d5d;
  box-shadow: 0 0 8px rgba(255, 93, 93, 0.85);
}


.wc-tl-scale {
  margin-bottom: var(--space-10);
  display: grid;
  grid-template-columns: 150px repeat(24, 1fr) 112px;
  gap: var(--space-10);
  color: var(--text-muted);
  font-size: var(--fs-11);
  text-align: center;
  font-variant-numeric: tabular-nums;
}

/* 刻度左右占位列（与行的城市列/时间列同宽，保证 0-23 与横条对齐） */
.wc-tl-scale-ph {
  display: block;
  min-width: 0;
}

/* 时间条行尾常驻信息（当前时间 + 日期，无 hover 气泡） */
.wc-tl-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1px;
  min-width: 0;
  line-height: 1.2;
}

.wc-tl-meta-time {
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  font-weight: 700;
  color: #14718f;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.3px;
}

.wc-tl-meta-date {
  font-size: var(--fs-11);
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* ─────────────────── 换算器 ─────────────────── */
.wc-converter-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-10);
}

/* 侧边栏内的换算器：来源/目标一行（两列），时刻与按钮占整行 */
.wc-converter--side .wc-converter-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
}

.wc-converter--side .wc-select,
.wc-converter--side .wc-input {
  width: 100%;
  max-width: none;
  min-width: 0;
  height: 32px;
  padding: 0 8px;
  font-size: var(--fs-12);
  border-radius: var(--radius-6);
}

.wc-converter--side .wc-converter-row input[type="datetime-local"] {
  grid-column: 1 / -1;
}

.wc-converter--side .wc-btn {
  width: 100%;
  height: 32px;
  padding: 0 12px;
  font-size: var(--fs-12);
  border-radius: var(--radius-6);
  grid-column: 1 / -1;
}

.wc-converter--side .wc-converter-result {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-6);
  margin-top: var(--space-12);
  padding: var(--space-8) var(--space-12);
}

.wc-converter--side .wc-conv-item {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  min-width: 0;
}

.wc-converter--side .wc-conv-label {
  font-size: var(--fs-11);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.wc-converter--side .wc-conv-time {
  font-size: var(--fs-13);
  line-height: 1.2;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.wc-converter--side .wc-conv-date {
  display: none;
}

.wc-converter--side .wc-conv-diff {
  align-self: center;
  margin-left: 0;
  padding: var(--space-2) var(--space-10);
  border-radius: var(--radius-pill);
  background: rgba(93, 151, 67, 0.1);
  border: 1px solid rgba(93, 151, 67, 0.25);
  color: var(--primary-dark);
  font-size: var(--fs-11);
  font-weight: 600;
  line-height: 1.3;
}

.wc-select,
.wc-input {
  height: 38px;
  padding: 0 12px;
  border-radius: var(--radius-8);
  border: 1px solid var(--border-color);
  background: #fff;
  color: var(--text-primary);
  font-size: var(--fs-13);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.wc-select:focus,
.wc-input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(93, 151, 67, 0.15);
}

.wc-select { max-width: 240px; min-width: 150px; }

.wc-input[type="datetime-local"] { min-width: 210px; }

.wc-btn {
  height: 38px;
  padding: 0 18px;
  border: none;
  border-radius: var(--radius-8);
  background: var(--primary-color);
  color: #fff;
  font-size: var(--fs-13);
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.wc-btn:hover { background: var(--primary-dark); }

.wc-converter-result {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-12) var(--space-20);
  margin-top: var(--space-16);
  padding: var(--space-16);
  border-radius: var(--radius-12);
  background: linear-gradient(135deg, var(--primary-bg), #f6faf3);
  border: 1px solid rgba(93, 151, 67, 0.18);
}

.wc-conv-item {
  display: flex;
  flex-direction: column; gap: var(--space-2);
}

.wc-conv-label {
  font-size: var(--fs-11);
  font-weight: 600;
  color: var(--primary-dark);
}

.wc-conv-time {
  font-family: var(--font-mono);
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.wc-conv-date {
  font-size: var(--fs-11);
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.wc-conv-diff {
  margin-left: auto;
  font-size: var(--fs-13);
  font-weight: 600;
  color: var(--accent-color);
}

/* ─────────────────── 侧边栏：世界时刻速览 + 昼夜分布 ─────────────────── */
/* 全球昼夜分布 */
.wc-dn-bar {
  height: 10px;
  border-radius: var(--radius-pill);
  overflow: hidden;
  background: linear-gradient(90deg, #17204a, #27407d);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.3);
}

.wc-dn-bar i {
  display: block;
  height: 100%;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, #ffd76a, #ffb85c);
  box-shadow: 0 0 8px rgba(255, 215, 106, 0.6);
  transition: width 0.6s ease;
}

.wc-dn-legend {
  display: flex;
  justify-content: space-between; margin-top: var(--space-8);
  font-size: var(--fs-12);
  color: var(--text-secondary);
}

.wc-dn-legend span {
  display: inline-flex;
  align-items: center; gap: var(--space-4);
}

.wc-dn-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: none;
}

.wc-dn-dot-day {
  background: #ffd76a;
  box-shadow: 0 0 6px rgba(255, 215, 106, 0.8);
}

.wc-dn-dot-night {
  background: #7fa4ff;
  box-shadow: 0 0 6px rgba(127, 164, 255, 0.7);
}

.wc-dn-legend b {
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

/* ─────────────────── 页脚说明 ─────────────────── */
.wc-footnote {
  margin: 4px 0 22px;
  padding: var(--space-12) var(--space-16) var(--space-12) var(--space-20);
  border-radius: var(--radius-12);
  background: #ffffff;
  border: 1px solid rgba(93, 151, 67, 0.4);
  border-left: 4px solid var(--primary-color);
  color: #2b3445;
  font-size: var(--fs-12);
  line-height: var(--lh-loose);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.18);
}

.wc-footnote p { margin: 0; }

.wc-footnote code {
  padding: 1px var(--space-6);
  border-radius: var(--radius-6);
  background: rgba(93, 151, 67, 0.14);
  color: #2d6a4f;
  font-family: var(--font-mono);
  font-size: var(--fs-11);
}

.wc-footnote a { color: #2d6a4f; text-decoration: none; }
.wc-footnote a:hover { text-decoration: underline; }

/* ─────────────────── 响应式 ─────────────────── */
@media (max-width: 767px) {
  .wc-hero { padding: var(--space-28) var(--space-20) var(--space-28); }
  .wc-hero-clock { min-width: 0; text-align: left; }
  .wc-hero-city { justify-content: flex-start; }
  .wc-hero-city-offset { margin-left: 0; }
  .wc-section { padding: var(--space-16) var(--space-16) var(--space-20); }
  .wc-conv-diff { margin-left: 0; }
  .wc-tl-row { grid-template-columns: 86px minmax(0, 1fr); }
}

/* ============================================================
   深度美化层：区块标题装饰 / hero 强化 / 卡片质感 / 微交互
   ============================================================ */

/* ── 区块标题：左侧渐变装饰条 ── */
.wc-section-head {
  align-items: center;
}

.wc-section-title {
  display: flex;
  align-items: center;
  gap: var(--space-10);
  font-size: var(--fs-20);
  letter-spacing: 0.5px;
}

.wc-section-title::before {
  content: '';
  width: 4px;
  height: 18px;
  border-radius: var(--radius-4);
  background: linear-gradient(180deg, var(--primary-color), #7fd4a8);
  box-shadow: 0 0 8px rgba(93, 151, 67, 0.4);
}

.wc-section-desc {
  letter-spacing: 0.2px;
}

/* ── Hero：边框光 + 双时钟卡片质感 ── */
.wc-hero-clock {
  position: relative;
  overflow: hidden;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}

/* 时钟卡片顶部高光线 */
.wc-hero-clock::before {
  content: '';
  position: absolute;
  top: 0;
  left: 12%;
  right: 12%;
  height: 1.5px;
  border-radius: var(--radius-2);
  background: linear-gradient(90deg, transparent, rgba(82, 168, 232, 0.4), transparent);
}

.wc-hero-clock:hover {
  transform: translateY(-2px);
}

.wc-hero-clock-utc:hover {
  border-color: rgba(52, 152, 219, 0.5);
  box-shadow: 0 10px 26px -12px rgba(52, 152, 219, 0.35);
}

.wc-hero-clock-beijing:hover {
  border-color: rgba(52, 152, 219, 0.55);
  box-shadow: 0 10px 26px -12px rgba(52, 152, 219, 0.38);
}

.wc-hero-city {
  padding-bottom: var(--space-8);
  border-bottom: 1px dashed rgba(52, 152, 219, 0.2);
}

.wc-hero-date {
  display: inline-block;
  margin-top: var(--space-8);
  padding: var(--space-2) var(--space-12);
  border-radius: var(--radius-pill);
  background: rgba(52, 152, 219, 0.08);
  color: var(--text-secondary);
}

/* 时钟卡片底部副标注（充实右侧区域） */
.wc-hero-clock-note { margin-top: var(--space-6); padding-top: var(--space-6);
  border-top: 1px dashed rgba(52, 152, 219, 0.18);
  font-size: var(--fs-11);
  color: var(--text-muted);
  letter-spacing: 0.3px;
}

.wc-hero-clock-utc .wc-hero-date {
  background: rgba(78, 205, 196, 0.12);
}

/* ── Tab：渐变激活态 + 悬停浮起 ── */
.wc-tab {
  transition: all var(--transition-fast), transform 0.18s ease, box-shadow 0.18s ease;
}

.wc-tab:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px -4px rgba(93, 151, 67, 0.25);
}

.wc-tab.is-active {
  background: linear-gradient(135deg, var(--primary-color), #74a84e);
  border-color: transparent;
  box-shadow: 0 4px 14px -3px rgba(93, 151, 67, 0.45);
}

/* ── 城市卡片：顶部高光线 + 表盘光晕 + 入场动效 ── */
.wc-card {
  overflow: hidden;
}

.wc-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 14%;
  right: 14%;
  height: 2px;
  border-radius: var(--radius-2);
  background: linear-gradient(90deg, transparent, rgba(93, 151, 67, 0.5), transparent);
  opacity: 0.55;
  transition: opacity 0.2s ease;
}

.wc-card:hover::before {
  opacity: 1;
}

.wc-analog-wrap::before {
  content: '';
  position: absolute;
  inset: -16px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(93, 151, 67, 0.13), transparent 72%);
  pointer-events: none;
}

.wc-card:hover {
  border-color: rgba(93, 151, 67, 0.35);
}

.wc-card-time {
  position: relative;
}

/* 面板切换淡入（仅切换瞬间，无持续开销） */
.wc-tab-panel.is-active {
  animation: wc-panel-in 0.32s ease;
}

@keyframes wc-panel-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── 徽标：彩色圆点前缀 ── */
.wc-badge { gap: var(--space-4);
}

.wc-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex: none;
}

.wc-badge-diff::before {
  background: #5d9743;
  box-shadow: 0 0 5px rgba(93, 151, 67, 0.7);
}

.wc-badge-utc::before {
  background: #3498db;
  box-shadow: 0 0 5px rgba(52, 152, 219, 0.7);
}

.wc-badge-date::before {
  background: #e67e22;
  box-shadow: 0 0 5px rgba(230, 126, 34, 0.7);
}

/* ── 时间条：轨道内阴影 + 标记三角 + 行悬停 ── */
.wc-tl-track {
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.35);
}

.wc-tl-marker::after {
  content: '';
  position: absolute;
  top: -4px;
  left: 50%;
  transform: translateX(-50%);
  border: 4px solid transparent;
  border-bottom-color: #ff5d5d;
}

.wc-tl-row {
  transition: background-color 0.15s ease;
}

.wc-tl-row:hover .wc-tl-city {
  color: var(--primary-dark);
}

.wc-tl-row:hover .wc-tl-city small {
  color: var(--text-secondary);
}

/* ── 换算器：结果卡片光 ── */
.wc-converter-result {
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6), 0 3px 12px rgba(93, 151, 67, 0.1);
}

.wc-btn {
  box-shadow: 0 3px 10px -3px rgba(93, 151, 67, 0.45);
}

.wc-btn:hover {
  box-shadow: 0 5px 14px -3px rgba(93, 151, 67, 0.55);
}

/* ── 移动端补充 ── */
@media (max-width: 767px) {
  .wc-hero-clocks {
    flex-direction: column;
    align-items: stretch;
  }
  .wc-hero-clock,
  .wc-hero-clock-utc,
  .wc-hero-clock-beijing {
    width: 100%;
    min-width: 0;
  }
  .wc-card-time {
    font-size: var(--fs-18);
  }
  .wc-map-legend {
    left: var(--space-8);
    right: var(--space-8);
    bottom: var(--space-8);
    justify-content: center;
    gap: var(--space-8);
    font-size: var(--fs-11);
    padding: var(--space-6) var(--space-8);
  }
}

/* ─────────────────── 时钟卡片角标：太阳/月亮动画 ─────────────────── */
.wc-clock-orb {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  z-index: 2;
  width: 44px;
  height: 44px;
  pointer-events: none;
}

/* 太阳：旋转射线 */
.wc-clock-orb--sun .wc-orb-rays {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: repeating-conic-gradient(from 0deg, rgba(255, 193, 60, 0.85) 0deg 10deg, transparent 10deg 45deg);
  -webkit-mask-image: radial-gradient(circle, transparent 58%, #000 59%, #000 78%, transparent 79%);
  mask-image: radial-gradient(circle, transparent 58%, #000 59%, #000 78%, transparent 79%);
  animation: wc-orb-spin 14s linear infinite;
}

.wc-clock-orb--sun .wc-orb-core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 22px;
  height: 22px;
  margin: -11px 0 0 -11px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #fff3c4, #ffc94d 70%, #f5a623);
  box-shadow: 0 0 16px rgba(255, 201, 77, 0.85);
  animation: wc-orb-pulse 3.2s ease-in-out infinite;
}

/* 月亮：新月 + 微光呼吸 + 浮动（与太阳脉冲动画呼应） */
.wc-clock-orb--moon .wc-orb-rays {
  display: none;
}

.wc-clock-orb--moon .wc-orb-core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 24px;
  height: 24px;
  margin: -12px 0 0 -12px;
  border-radius: 50%;
  box-shadow: inset -9px 6px 0 1px #e6eeff;
  filter: drop-shadow(0 0 10px rgba(190, 210, 255, 0.75));
  animation: wc-orb-float 5.5s ease-in-out infinite, wc-orb-moon-glow 3.6s ease-in-out infinite;
}

@keyframes wc-orb-spin {
  to { transform: rotate(360deg); }
}

@keyframes wc-orb-pulse {
  0%, 100% { box-shadow: 0 0 16px rgba(255, 201, 77, 0.85); }
  50% { box-shadow: 0 0 26px rgba(255, 201, 77, 1); }
}

@keyframes wc-orb-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

/* 月亮微光呼吸：柔光随帧亮暗起伏 */
@keyframes wc-orb-moon-glow {
  0%, 100% { opacity: 0.85; filter: drop-shadow(0 0 6px rgba(190, 210, 255, 0.5)); }
  50% { opacity: 1; filter: drop-shadow(0 0 18px rgba(190, 210, 255, 0.95)); }
}

/* Hero 数字时间：滚动数字列（odometer 效果，仅变化的数字向上翻动） */
.wc-hero-time .wc-roll-digit {
  display: inline-block;
  height: 1em;
  line-height: 1;
  overflow: hidden;
  vertical-align: top;
}

.wc-hero-time .wc-roll-strip {
  display: block;
  line-height: 1;
}

.wc-hero-time .wc-roll-strip i {
  display: block;
  height: 1em;
  line-height: 1;
  font-style: normal;
}

.wc-hero-time .wc-roll-colon {
  display: inline-block;
  line-height: 1;
  vertical-align: top;
}

/* ─────────────────── Hero 夜晚模式（北京夜晚时切换深色夜空主题） ─────────────────── */
.wc-hero--night {
  background:
    radial-gradient(ellipse at 82% 0%, rgba(125, 155, 255, 0.22), transparent 52%),
    radial-gradient(ellipse at 12% 105%, rgba(155, 115, 235, 0.18), transparent 52%),
    radial-gradient(ellipse at 50% 55%, rgba(85, 115, 225, 0.09), transparent 62%),
    radial-gradient(1.5px 1.5px at 30% 28%, rgba(255, 255, 255, 0.55), transparent 60%),
    radial-gradient(1.2px 1.2px at 58% 15%, rgba(255, 255, 255, 0.4), transparent 60%),
    radial-gradient(1.4px 1.4px at 76% 42%, rgba(255, 255, 255, 0.5), transparent 60%),
    radial-gradient(1.1px 1.1px at 18% 62%, rgba(255, 255, 255, 0.35), transparent 60%),
    radial-gradient(1.3px 1.3px at 45% 78%, rgba(255, 255, 255, 0.42), transparent 60%),
    linear-gradient(160deg, #0c1534 0%, #090f26 50%, #101a3e 100%);
  border-color: rgba(125, 160, 255, 0.24);
  box-shadow: 0 16px 42px -18px rgba(15, 30, 90, 0.65), inset 0 1px 0 rgba(255, 255, 255, 0.07);
}

.wc-hero--night .wc-stars {
  display: block;
}

.wc-hero--night .wc-hero-title {
  background: linear-gradient(90deg, #8fd0ff, #a8e8d0);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.wc-hero--night .wc-hero-sub {
  color: rgba(255, 255, 255, 0.62);
}

.wc-hero--night .wc-hero-badge {
  background: rgba(120, 160, 255, 0.14);
  border-color: rgba(120, 160, 255, 0.35);
  color: #bcd8ff;
}

.wc-hero--night .wc-hero-badge::before {
  background: #8fd0ff;
  box-shadow: 0 0 9px rgba(143, 208, 255, 0.9);
}

.wc-hero--night .wc-hero-clock {
  background: rgba(20, 30, 60, 0.55);
  border-color: rgba(120, 160, 255, 0.25);
}

.wc-hero--night .wc-hero-clock-utc {
  background: rgba(18, 38, 48, 0.55);
  border-color: rgba(120, 200, 190, 0.3);
}

.wc-hero--night .wc-hero-clock-beijing {
  background: rgba(24, 30, 66, 0.6);
  border-color: rgba(120, 160, 255, 0.3);
}

.wc-hero--night .wc-hero-time {
  color: #cfe4ff;
  text-shadow: 0 0 22px rgba(120, 160, 255, 0.5);
}

.wc-hero--night .wc-hero-clock-utc .wc-hero-time {
  color: #a8f0d5;
  text-shadow: 0 0 22px rgba(90, 220, 175, 0.5);
}

.wc-hero--night .wc-hero-clock-beijing .wc-hero-time {
  color: #cfe0ff;
}

.wc-hero--night .wc-hero-city-name,
.wc-hero--night .wc-hero-clock-utc .wc-hero-city-name,
.wc-hero--night .wc-hero-clock-beijing .wc-hero-city-name {
  color: #eef4ff;
}

.wc-hero--night .wc-hero-city-zone {
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.65);
}

.wc-hero--night .wc-hero-city-offset {
  background: rgba(120, 160, 255, 0.14);
  border-color: rgba(120, 160, 255, 0.3);
  color: #a8c8ff;
}

.wc-hero--night .wc-hero-city {
  border-bottom-color: rgba(255, 255, 255, 0.12);
}

.wc-hero--night .wc-hero-date {
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.6);
}

.wc-hero--night .wc-hero-clock-note {
  border-top-color: rgba(120, 160, 255, 0.15);
  color: rgba(255, 255, 255, 0.45);
}

.wc-hero--night .wc-hero-stats {
  background: rgba(20, 30, 60, 0.45);
  border-color: rgba(120, 160, 255, 0.18);
  color: rgba(255, 255, 255, 0.65);
}

.wc-hero--night .wc-hero-stat b {
  color: #fff;
}