/* ============================================================
 * 中世对照历史时间轴 · Apple HIG + Emil Kowalski 原则
 *
 * 设计理念：
 * - 系统字体（SF Pro / 苹方 / Segoe UI）+ 紧字距大标题
 * - 半透明 header（backdrop-filter）
 * - 只动 transform 和 opacity（硬件加速）
 * - 自定义 cubic-bezier 曲线（强 ease-out）
 * - 减弱动效支持（prefers-reduced-motion）
 * ============================================================ */

/* -------- 设计 tokens -------- */
:root {
  /* 字体 */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro SC',
    'PingFang SC', 'Helvetica Neue', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'SF Mono', ui-monospace, 'JetBrains Mono', Menlo, monospace;

  /* 自定义曲线（Emil 建议的标准 ease-out） */
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
  --ease-drawer: cubic-bezier(0.32, 0.72, 0, 1);

  /* 动效时长 */
  --t-fast: 120ms;
  --t-base: 200ms;
  --t-slow: 280ms;

  /* 颜色 - 灰色 */
  --gray-50: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;

  /* 分类色（事件 5 大类） */
  --cat-political: #dc2626;
  --cat-economic: #d97706;
  --cat-cultural: #2563eb;
  --cat-scientific: #16a34a;
  --cat-figures: #9333ea;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.06), 0 4px 8px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.08), 0 8px 24px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 8px 24px rgba(0, 0, 0, 0.10), 0 16px 48px rgba(0, 0, 0, 0.06);

  /* 半径 */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
}

/* -------- 重置 -------- */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font: 14px/1.5 var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'kern', 'liga', 'calt';
  color: var(--gray-900);
  background: var(--gray-50);
}

body {
  margin: 0;
  min-height: 100vh;
}

h1, h2, h3, h4, p {
  margin: 0;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

input, select {
  font: inherit;
  color: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

/* -------- 顶部 header（Apple 风格半透明） -------- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.72);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.app-header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 16px 24px 12px;
}

.app-header-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 12px;
  gap: 16px;
  flex-wrap: wrap;
}

.app-title-group {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.app-title {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--gray-900);
}

.app-subtitle {
  font-size: 12px;
  color: var(--gray-500);
  font-family: var(--font-mono);
}

.app-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--gray-500);
}

.stat-pill {
  background: rgba(0, 0, 0, 0.04);
  padding: 4px 10px;
  border-radius: 10px;
  font-family: var(--font-mono);
  font-weight: 500;
}

.stat-pill #total-count {
  color: var(--gray-900);
  font-weight: 600;
}

.header-link {
  color: var(--gray-500);
  text-decoration: underline;
  text-decoration-color: var(--gray-300);
  text-underline-offset: 3px;
  transition: color var(--t-fast) var(--ease-out);
}

.header-link:hover {
  color: var(--gray-900);
}

/* -------- 视图切换 tabs -------- */
.view-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
  background: rgba(0, 0, 0, 0.04);
  padding: 3px;
  border-radius: 8px;
  width: fit-content;
}

.view-tab {
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-600);
  border-radius: 5px;
  transition: all var(--t-fast) var(--ease-out);
  white-space: nowrap;
}

.view-tab:hover {
  color: var(--gray-900);
}

.view-tab.active {
  background: white;
  color: var(--gray-900);
  box-shadow: var(--shadow-sm), 0 1px 2px rgba(0, 0, 0, 0.04);
}

.view-tab:active {
  transform: scale(0.97);
}

/* -------- 筛选栏 -------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
  padding-top: 4px;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.filter-label {
  font-size: 12px;
  color: var(--gray-500);
  font-weight: 500;
  letter-spacing: 0.01em;
}

.filter-chips {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.chip {
  padding: 4px 12px;
  font-size: 11px;
  font-weight: 500;
  border-radius: 14px;
  border: 1px solid;
  transition: all var(--t-fast) var(--ease-out);
  white-space: nowrap;
}

.chip:active:not(:disabled) {
  transform: scale(0.97);
}

.year-range {
  display: flex;
  align-items: center;
  gap: 8px;
}

.range-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 110px;
  height: 4px;
  background: var(--gray-200);
  border-radius: 2px;
  outline: none;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--gray-700);
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--t-fast) var(--ease-out);
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.range-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--gray-700);
  border-radius: 50%;
  cursor: pointer;
  border: 0;
}

.year-display {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gray-700);
  min-width: 72px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.range-sep {
  color: var(--gray-400);
  font-size: 11px;
}

.search-input, .select-input {
  padding: 5px 10px;
  font-size: 12px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  background: white;
  outline: none;
  transition: border-color var(--t-fast) var(--ease-out),
    box-shadow var(--t-fast) var(--ease-out);
  min-width: 160px;
}

.search-input:focus, .select-input:focus {
  border-color: var(--gray-400);
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

/* -------- 按钮 -------- */
.btn-primary {
  padding: 6px 14px;
  background: var(--gray-900);
  color: white;
  font-size: 12px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--t-fast) var(--ease-out);
}

.btn-primary:not(:disabled):hover {
  background: var(--gray-700);
}

.btn-primary:not(:disabled):active {
  transform: scale(0.97);
}

.btn-ghost {
  padding: 5px 10px;
  font-size: 11px;
  color: var(--gray-600);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  transition: all var(--t-fast) var(--ease-out);
}

.btn-ghost:hover {
  background: var(--gray-100);
  color: var(--gray-900);
}

.btn-ghost:active {
  transform: scale(0.97);
}

/* -------- 视图切换（active class 控制） -------- */
.view {
  display: none;
}

.view.active {
  display: block;
}

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

/* ============================================================
 * 时间轴视图
 * ============================================================ */

.timeline-header {
  display: grid;
  grid-template-columns: 1fr 90px 1fr;
  gap: 0;
  padding: 0 0 8px 0;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--gray-200);
}

.column-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--gray-700);
  padding: 4px 8px;
  text-transform: uppercase;
}

.column-label.china-side {
  text-align: left;
  border-left: 3px solid var(--cat-political);
  padding-left: 12px;
}

.column-label.world-side {
  text-align: right;
  border-right: 3px solid var(--gray-500);
  padding-right: 12px;
}

.axis-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--gray-500);
  text-align: center;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.timeline-rows {
  position: relative;
}

/* ===== 年行（核心：左右事件对齐到同一年） ===== */
.year-row {
  display: grid;
  grid-template-columns: 1fr 90px 1fr;
  gap: 0;
  align-items: stretch;
  min-height: 56px;
  position: relative;
  padding: 4px 0;
  /* staggered animation support */
  opacity: 1;
  transition: opacity var(--t-base) var(--ease-out),
    transform var(--t-base) var(--ease-out);
}

.year-row.entering {
  opacity: 0;
  transform: translateY(8px);
}

.year-row.milestone {
  min-height: 36px;
  opacity: 0.6;
}

/* ---- 左/右 cells ---- */
.year-row .cell {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.year-row .china-cell {
  padding-right: 24px; /* 给 connector 线留位 */
  align-items: flex-end;
}

.year-row .world-cell {
  padding-left: 24px;
  align-items: flex-start;
}

.year-row .china-cell.empty,
.year-row .world-cell.empty {
  /* nothing here, but still takes space */
}

/* ---- 中央 axis 年份 tick ---- */
.year-row .axis-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

/* 中央一条贯穿的细线（让年份 tick "挂" 在上面） */
.year-row .axis-cell::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--gray-200);
  transform: translateX(-0.5px);
}

.year-tick {
  position: relative;
  background: var(--gray-50);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--gray-700);
  white-space: nowrap;
  z-index: 1;
  transition: background var(--t-fast) var(--ease-out);
}

.year-tick:hover {
  background: white;
  box-shadow: var(--shadow-sm);
}

.year-row.milestone .year-tick {
  background: transparent;
  color: var(--gray-400);
  font-weight: 400;
}

/* -------- 事件卡片 -------- */
.event-card {
  background: white;
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-left: 3px solid var(--cat-color);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  max-width: 100%;
  width: 100%;
  position: relative;
  cursor: pointer;
  transition: transform var(--t-base) var(--ease-out),
    box-shadow var(--t-base) var(--ease-out),
    border-color var(--t-base) var(--ease-out);
  will-change: transform;
}

/* China 卡片：右侧有 connector 线 */
.china-cell .event-card::after {
  content: '';
  position: absolute;
  top: 50%;
  right: -24px;
  width: 24px;
  height: 1px;
  background: var(--cat-color);
  opacity: 0.45;
  pointer-events: none;
  transform: translateY(-0.5px);
}

/* World 卡片：左侧有 connector 线 */
.world-cell .event-card::before {
  content: '';
  position: absolute;
  top: 50%;
  left: -24px;
  width: 24px;
  height: 1px;
  background: var(--cat-color);
  opacity: 0.45;
  pointer-events: none;
  transform: translateY(-0.5px);
}

/* hover：抬起 */
.event-card:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* 按下：缩放（Apple HIG） */
.event-card:active {
  transform: scale(0.985);
}

.event-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  color: var(--gray-500);
  margin-bottom: 4px;
  flex-wrap: wrap;
}

.year-label {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: -0.01em;
}

.dynasty-tag {
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 4px;
  background: rgba(217, 119, 6, 0.10);
  color: #92400e;
  font-weight: 500;
}

.subcat-tag {
  padding: 1px 7px;
  border-radius: 8px;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.event-card-title {
  font-size: 13.5px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--gray-900);
  letter-spacing: -0.005em;
}

.event-card-body {
  margin-top: 8px;
  font-size: 12.5px;
  color: var(--gray-600);
  line-height: 1.65;
  display: none;
}

.event-card.expanded .event-card-body {
  display: block;
}

.event-card-body strong {
  color: var(--gray-900);
  font-weight: 600;
}

.event-card-people {
  margin-top: 6px;
  font-size: 11px;
  color: var(--gray-500);
}

.event-card-people-label {
  margin-right: 4px;
}

.event-card-link {
  display: inline-block;
  margin-top: 8px;
  font-size: 11px;
  color: var(--cat-color);
  font-weight: 500;
  transition: opacity var(--t-fast) var(--ease-out);
}

.event-card-link:hover {
  opacity: 0.7;
}

/* -------- 空态 -------- */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--gray-400);
  font-size: 13px;
}

/* ============================================================
 * 表格视图
 * ============================================================ */

.table-wrapper {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.events-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 13px;
}

.events-table thead th {
  position: sticky;
  top: 0;
  background: var(--gray-50);
  padding: 10px 14px;
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--gray-500);
  border-bottom: 1px solid var(--gray-200);
  white-space: nowrap;
  user-select: none;
  transition: background var(--t-fast) var(--ease-out);
}

.events-table thead th[data-sort] {
  cursor: pointer;
}

.events-table thead th[data-sort]:hover {
  background: var(--gray-100);
  color: var(--gray-700);
}

.events-table thead th.sorted-asc::after {
  content: ' ↑';
  color: var(--gray-700);
}

.events-table thead th.sorted-desc::after {
  content: ' ↓';
  color: var(--gray-700);
}

.events-table tbody td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--gray-100);
  vertical-align: middle;
}

.events-table tbody tr {
  transition: background-color var(--t-fast) var(--ease-out);
}

.events-table tbody tr:hover {
  background: var(--gray-50);
}

.events-table tbody tr:last-child td {
  border-bottom: 0;
}

.cell-year {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
  color: var(--gray-900);
}

.cell-side {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.cell-side.china {
  color: var(--cat-political);
}

.cell-side.world {
  color: var(--gray-700);
}

.cell-cat {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
}

.cell-cat-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cat-color, var(--gray-300));
  flex-shrink: 0;
}

.cell-subcat {
  font-size: 11px;
  color: var(--gray-600);
}

.cell-title {
  font-weight: 500;
  color: var(--gray-900);
  letter-spacing: -0.005em;
}

.cell-people {
  font-size: 11px;
  color: var(--gray-500);
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.cell-source {
  font-size: 11px;
  color: var(--gray-500);
}

.cell-source a {
  color: var(--cat-cultural);
  text-decoration: underline;
  text-decoration-color: var(--gray-300);
  text-underline-offset: 2px;
}

.cell-source a:hover {
  text-decoration-color: var(--cat-cultural);
}

.th-actions, .cell-actions {
  width: 100px;
  text-align: right;
}

.cell-actions {
  display: flex;
  gap: 4px;
  justify-content: flex-end;
}

.icon-btn {
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--gray-500);
  font-size: 14px;
  transition: all var(--t-fast) var(--ease-out);
}

.icon-btn:not(:disabled):hover {
  background: var(--gray-100);
  color: var(--gray-900);
}

.icon-btn:not(:disabled):active {
  transform: scale(0.92);
}

.table-footer {
  padding: 12px 16px;
  font-size: 12px;
  color: var(--gray-500);
  text-align: right;
  background: white;
  border-top: 1px solid var(--gray-100);
}

/* ============================================================
 * Modal
 * ============================================================ */

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.4);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-base) var(--ease-out);
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 640px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  transform: scale(0.96) translateY(8px);
  opacity: 0;
  transition: transform var(--t-slow) var(--ease-out-back),
    opacity var(--t-slow) var(--ease-out);
}

.modal-backdrop.open .modal-card {
  transform: scale(1) translateY(0);
  opacity: 1;
}

.modal-header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--gray-100);
  position: relative;
}

.modal-meta {
  font-size: 12px;
  color: var(--gray-500);
  font-family: var(--font-mono);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.modal-meta .dot {
  color: var(--gray-300);
}

.modal-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--gray-900);
  padding-right: 32px;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  line-height: 1;
  color: var(--gray-500);
  border-radius: 50%;
  transition: all var(--t-fast) var(--ease-out);
}

.modal-close:hover {
  background: var(--gray-100);
  color: var(--gray-900);
}

.modal-close:active {
  transform: scale(0.92);
}

.modal-body {
  padding: 16px 24px 24px;
}

.modal-description {
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray-700);
}

.modal-description strong {
  color: var(--gray-900);
  font-weight: 600;
}

.modal-people {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--gray-100);
  font-size: 13px;
  color: var(--gray-600);
}

.modal-people-label {
  font-weight: 600;
  color: var(--gray-700);
  margin-right: 6px;
}

.modal-section-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--gray-500);
  margin: 16px 0 8px 0;
}

#modal-sources {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

#modal-sources li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 12px;
}

.source-type-tag {
  flex-shrink: 0;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--gray-100);
  color: var(--gray-600);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

#modal-sources a {
  color: var(--cat-cultural);
  text-decoration: underline;
  text-decoration-color: var(--gray-300);
  text-underline-offset: 2px;
  word-break: break-all;
  transition: text-decoration-color var(--t-fast) var(--ease-out);
}

#modal-sources a:hover {
  text-decoration-color: var(--cat-cultural);
}

/* ============================================================
 * 错误提示
 * ============================================================ */
.error-banner {
  position: fixed;
  bottom: 16px;
  right: 16px;
  z-index: 200;
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #b91c1c;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  animation: slide-in-up var(--t-base) var(--ease-out-back);
}

.error-banner strong {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

@keyframes slide-in-up {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================================
 * 响应式
 * ============================================================ */

@media (max-width: 1023px) {
  /* 平板/手机：时间轴退化为单列 */
  .timeline-header {
    grid-template-columns: 1fr;
  }
  .timeline-header .axis-label,
  .timeline-header .china-side,
  .timeline-header .world-side {
    display: none;
  }
  .timeline-header::after {
    content: '建议在桌面端（≥1024px）查看左右对照视图';
    grid-column: 1;
    text-align: center;
    color: var(--gray-400);
    font-size: 12px;
    padding: 8px;
    background: var(--gray-50);
    border-radius: var(--radius-sm);
  }

  .year-row {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .year-row .axis-cell {
    display: flex;
    padding: 4px 0;
  }
  .year-row .china-cell,
  .year-row .world-cell {
    padding: 0;
    align-items: stretch;
  }
  .china-cell .event-card::after,
  .world-cell .event-card::before {
    display: none; /* 手机端不需要 connector */
  }
  .year-row .axis-cell::before {
    display: none;
  }

  .app-header-inner {
    padding: 12px 16px 8px;
  }
  .app-main {
    padding: 16px;
  }
  .app-title {
    font-size: 17px;
  }
}

@media (max-width: 640px) {
  .app-header-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .filter-bar {
    gap: 12px;
  }
  .events-table {
    font-size: 12px;
  }
  .events-table thead th,
  .events-table tbody td {
    padding: 8px 10px;
  }
}

/* ============================================================
 * 减弱动效（prefers-reduced-motion）—— 可访问性硬要求
 * ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .event-card:hover {
    transform: none;
  }
  .event-card:active {
    transform: none;
  }
  .view-tab:active,
  .btn-ghost:active,
  .btn-primary:not(:disabled):active {
    transform: none;
  }
  .modal-card {
    transform: none;
  }
  /* connector 线在减弱动效下保持（不是位置变化） */
}

/* ============================================================
 * prefers-reduced-transparency：实化半透明表面
 * ============================================================ */
@media (prefers-reduced-transparency: reduce) {
  .app-header {
    background: white;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
  .modal-backdrop {
    background: rgba(0, 0, 0, 0.6);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
}