/* styles.css —— 时间线主题与布局 */

:root {
  --font-body: 'Inter', ui-sans-serif, system-ui, 'Microsoft YaHei', 'PingFang SC', 'Noto Sans SC', sans-serif;
  --card-radius: 14px;
}

/* ==================== 主题 ==================== */

/* 极简（默认，浅色） */
body,
body[data-theme="minimal"] {
  --bg-grad: #f6f7f9;
  --bg-solid: #ffffff;
  --text-main: #16181d;
  --text-muted: #767d8a;
  --card-bg: #ffffff;
  --card-border: #e5e7eb;
  --accent: #16181d;
  --accent-glow: rgba(16, 24, 40, 0.10);
  --guide-line: #d6dae1;
  --guide-grid: #eef0f3;
  --guide-node: #b7bdc8;
  --guide-label: #9ba2ae;
  --header-bg: rgba(255, 255, 255, 0.78);
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.05), 0 10px 24px rgba(16, 24, 40, 0.06);
  --shadow-hover: 0 6px 16px rgba(16, 24, 40, 0.10), 0 18px 44px rgba(16, 24, 40, 0.09);
  --font-body: 'Inter', ui-sans-serif, system-ui, 'Microsoft YaHei', 'PingFang SC', 'Noto Sans SC', sans-serif;
  color-scheme: light;
}

/* 午夜蓝（原深蓝玻璃主题） */
body[data-theme="midnight"] {
  --bg-grad: radial-gradient(1200px 600px at 20% -10%, #17253b 0%, transparent 60%), linear-gradient(180deg, #0f1724 0%, #071026 100%);
  --bg-solid: #0b1320;
  --text-main: #e6eef8;
  --text-muted: #93a5c0;
  --card-bg: rgba(13, 22, 36, 0.88);
  --card-border: rgba(255, 255, 255, 0.09);
  --accent: #4f9cff;
  --accent-glow: rgba(79, 156, 255, 0.28);
  --guide-line: rgba(255, 255, 255, 0.17);
  --guide-grid: rgba(255, 255, 255, 0.05);
  --guide-node: #4f9cff;
  --guide-label: #6d7f9b;
  --header-bg: rgba(7, 16, 38, 0.6);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-hover: 0 14px 44px rgba(0, 0, 0, 0.6);
  --font-body: 'Inter', ui-sans-serif, system-ui, 'Microsoft YaHei', 'PingFang SC', 'Noto Sans SC', sans-serif;
  color-scheme: dark;
}

/* 赛博朋克 */
body[data-theme="cyberpunk"] {
  --bg-grad: repeating-linear-gradient(0deg,
      transparent 0,
      transparent 2px,
      rgba(255, 0, 255, 0.045) 2px,
      rgba(255, 0, 255, 0.045) 4px),
    linear-gradient(to bottom, #050011, #120024);
  --bg-solid: #0a0a12;
  --text-main: #00f3ff;
  --text-muted: #ff7bff;
  --card-bg: rgba(8, 8, 16, 0.92);
  --card-border: rgba(0, 243, 255, 0.5);
  --accent: #ff00ff;
  --accent-glow: rgba(0, 243, 255, 0.35);
  --guide-line: rgba(0, 243, 255, 0.45);
  --guide-grid: rgba(255, 0, 255, 0.14);
  --guide-node: #ff00ff;
  --guide-label: #00f3ff;
  --header-bg: rgba(5, 0, 17, 0.7);
  --card-radius: 2px;
  --shadow: 0 0 16px rgba(0, 243, 255, 0.22);
  --shadow-hover: 0 0 28px rgba(255, 0, 255, 0.45);
  --font-body: 'Courier New', 'Microsoft YaHei', 'PingFang SC', monospace;
  color-scheme: dark;
}

/* 复古 */
body[data-theme="retro"] {
  --bg-grad: #000000;
  --bg-solid: #001100;
  --text-main: #33ff33;
  --text-muted: #22aa22;
  --card-bg: #001100;
  --card-border: #1c7a1c;
  --accent: #33ff33;
  --accent-glow: rgba(51, 255, 51, 0.2);
  --guide-line: #22aa22;
  --guide-grid: rgba(51, 255, 51, 0.12);
  --guide-node: #33ff33;
  --guide-label: #22aa22;
  --header-bg: #000000;
  --card-radius: 0px;
  --shadow: none;
  --shadow-hover: none;
  /* 字体未加载时回退到等宽字体 */
  --font-body: 'Press Start 2P', 'Microsoft YaHei', 'PingFang SC', 'Courier New', monospace;
  color-scheme: dark;
}

/* ==================== 基础 ==================== */

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg-grad);
  color: var(--text-main);
  font-family: var(--font-body);
  display: flex;
  flex-direction: column;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* 页头 */
.site-header {
  padding: 18px 40px;
  border-bottom: 1px solid var(--card-border);
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px 28px;
  z-index: 100;
}

.site-title {
  font-size: 1.3rem;
  margin: 0;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.site-subtitle {
  color: var(--text-muted);
  margin: 4px 0 0;
  font-size: 0.85rem;
}

.controls {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

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

.control-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.04em;
}

/* 原生 select：JS 增强后会被隐藏，仅在禁用 JS 时作为降级控件显示 */
select {
  background: var(--card-bg);
  color: var(--text-main);
  border: 1px solid var(--card-border);
  padding: 7px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

select:hover,
select:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
  outline: none;
}

/* ---------- 自定义下拉（与主题风格统一） ---------- */

.dd {
  position: relative;
  display: inline-block;
}

/* 隐藏原生控件，但保留其值与 change 事件语义 */
.dd-native {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
}

.dd-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  min-width: 112px;
  padding: 7px 10px 7px 12px;
  background: var(--card-bg);
  color: var(--text-main);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.85rem;
  line-height: 1.45;
  cursor: pointer;
  transition: border-color 0.18s, box-shadow 0.18s;
}

.dd-trigger:hover {
  border-color: var(--guide-node);
}

.dd[data-open="true"] .dd-trigger,
.dd-trigger:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
  outline: none;
}

.dd-value {
  white-space: nowrap;
}

.dd-caret {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  color: var(--text-muted);
  transition: transform 0.18s ease;
}

.dd[data-open="true"] .dd-caret {
  transform: rotate(180deg);
}

.dd-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  z-index: 200;
  min-width: 100%;
  margin: 0;
  padding: 4px;
  list-style: none;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  box-shadow: var(--shadow-hover);
  display: none;
}

.dd[data-open="true"] .dd-menu {
  display: block;
}

.dd-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: 6px;
  font-size: 0.85rem;
  color: var(--text-main);
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.12s;
}

.dd-option::before {
  content: '✓';
  flex: 0 0 10px;
  font-size: 0.7rem;
  color: var(--accent);
  opacity: 0;
}

.dd-option[aria-selected="true"] {
  background: var(--guide-grid);
  font-weight: 600;
}

.dd-option[aria-selected="true"]::before {
  opacity: 1;
}

.dd-option:hover,
.dd-option.is-active {
  background: var(--accent-glow);
}

/* ==================== 时间线画布 ==================== */

main {
  flex: 1;
  min-height: 0;
  position: relative;
}

.timeline {
  position: absolute;
  inset: 0;
  overflow: auto;
  /* 不用滚动条，改为按住拖动平移 */
  scrollbar-width: none;
  -ms-overflow-style: none;
  cursor: grab;
  /* 允许单指平移，双指捏合交给脚本处理（否则会被浏览器页面缩放吃掉） */
  touch-action: pan-x pan-y;
}

/* 捏合缩放时的百分比提示 */
.zoom-badge {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translate(-50%, 8px);
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow);
  color: var(--text-main);
  font-size: 0.78rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 300;
}

.zoom-badge.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.timeline::-webkit-scrollbar {
  display: none;
}

.timeline.is-dragging {
  cursor: grabbing;
  user-select: none;
}

.track {
  position: relative;
}

/* ==================== 引导线（SVG） ==================== */

.guides {
  position: absolute;
  left: 0;
  top: 0;
  pointer-events: none;
  overflow: visible;
}

.guides .axis,
.guides .spine {
  stroke: var(--guide-line);
  stroke-width: 2;
  stroke-linecap: round;
  fill: none;
}

.guides .grid {
  stroke: var(--guide-grid);
  stroke-width: 1;
  stroke-dasharray: 2 8;
}

.guides .stem {
  stroke: var(--guide-line);
  stroke-width: 1.5;
  fill: none;
}

.guides .node {
  fill: var(--bg-solid);
  stroke: var(--guide-node);
  stroke-width: 2;
}

.guides .year-label {
  fill: var(--guide-label);
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  /* 描边与背景同色，让标签压在引导线上时依然清晰 */
  paint-order: stroke;
  stroke: var(--bg-solid);
  stroke-width: 3px;
  stroke-linejoin: round;
}

/* ==================== 事件卡片 ==================== */

.event {
  position: absolute;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  padding: 16px 18px 18px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 6px;
  z-index: 1;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}

.event:hover,
.event:focus-visible {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow-hover);
  outline: none;
  z-index: 3;
}

.event-date {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

/* 反作弊标签 */
.event-tag {
  padding: 1px 7px;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: var(--guide-grid);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  white-space: nowrap;
}

.event-title {
  font-size: 1rem;
  margin: 0;
  font-weight: 700;
  line-height: 1.4;
  color: var(--accent);
}

.event-desc {
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--text-main);
  opacity: 0.78;
  margin: 0;
}

/* 图谱视图信息密度高，卡片更紧凑，描述最多显示 4 行 */
.timeline.view-graph .event {
  padding: 13px 15px 15px;
}

.timeline.view-graph .event-desc {
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ==================== 提示信息 ==================== */

.message {
  margin: 80px auto;
  max-width: 620px;
  padding: 22px 26px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  box-shadow: var(--shadow);
  font-size: 0.88rem;
  line-height: 1.85;
}

.message code {
  background: var(--guide-grid);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85em;
}

.message.error {
  border-color: #e5484d;
  color: #e5484d;
}

/* ==================== 页脚 ==================== */

.site-footer {
  text-align: center;
  padding: 10px;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid var(--card-border);
  background: var(--header-bg);
}

.site-footer p {
  margin: 0;
}

.site-footer .footer-note {
  margin-top: 2px;
  opacity: 0.75;
}

.site-footer code {
  font-size: 0.95em;
}

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

@media (max-width: 768px) {
  .site-header {
    padding: 16px 20px;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
  }

  .controls {
    width: 100%;
    gap: 10px 12px;
  }

  /* 两列排布，避免控件把页面撑宽 */
  .control-group {
    flex: 1 1 45%;
    min-width: 0;
  }

  .control-label {
    flex: 0 0 auto;
  }

  .dd {
    width: 100%;
  }

  .dd-trigger {
    width: 100%;
    min-width: 0;
  }

  select {
    width: 100%;
    min-width: 0;
  }
}