/* style.css — 卡西尼 3D 轨迹可视化 */
:root {
  --bg: #04060d;
  /* 灰色毛玻璃：按钮与悬浮面板统一使用 */
  --glass: rgba(118, 123, 134, 0.30);
  --glass-strong: rgba(92, 97, 108, 0.48);
  /* 低对比度描边 */
  --border-soft: rgba(255, 255, 255, 0.09);
  --accent: #7fb2ff;
  --accent2: #ffb380;   /* 浅橙：时间条 / 事件 */
  --accent2-soft: #d9b391; /* 降饱和橙：帮助弹窗操作项高亮 */
  --text: #dfe8f5;
  --text-dim: #8fa3c0;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; height: 100%; overflow: hidden; background: var(--bg); }
@supports (overflow: clip) {
  html, body { overflow: clip; } /* 彻底禁止程序化滚动导致的画面偏移 */
}
body {
  position: fixed; inset: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  user-select: none;
  -webkit-user-select: none;
}
#app { position: relative; width: 100%; height: 100%; }
#scene { position: absolute; inset: 0; width: 100%; height: 100%; display: block; cursor: grab; }
#scene:active { cursor: grabbing; }

/* ---------- 顶栏 ---------- */
#topbar {
  position: absolute; top: 0; left: 0; right: 0;
  display: flex; align-items: center;
  padding: 12px 16px;
  background: linear-gradient(to bottom, rgba(4,6,13,0.85), rgba(4,6,13,0));
  z-index: 10;
  pointer-events: none;
}
#topbar > * { pointer-events: auto; }
#brand { display: flex; flex-direction: column; gap: 2px; }
#brand h1 { font-size: 16px; font-weight: 600; letter-spacing: 1px; }
#brand p { font-size: 10.5px; color: var(--text-dim); letter-spacing: 1.2px; }

/* 视图按钮组靠右，紧贴右侧 "?" 按钮 */
#view-buttons { display: flex; gap: 8px; align-items: center; margin-left: auto; }
#hud-right { position: relative; display: flex; gap: 6px; margin-left: 12px; }
.view-btn {
  background: var(--glass); border: 1px solid var(--border-soft);
  color: var(--text-dim); padding: 7px 14px; border-radius: 6px;
  font-size: 12.5px; cursor: pointer;
  transition: background-color .45s ease, color .45s ease;
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
/* 悬停不做边框高亮：仅背景与文字缓慢微微亮起 */
.view-btn:hover { color: var(--text); background: rgba(255,255,255,0.07); }
.view-btn.active { background: rgba(255,255,255,0.14); color: var(--text); border-color: rgba(255,255,255,0.26); }
.vb-divider {
  width: 1px; height: 22px; margin: 0 4px;
  background: var(--border-soft);
}
#trail-history {
  display: flex; gap: 0;
  border: 1px solid var(--border-soft);
  border-radius: 6px; overflow: hidden;
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
#trail-history .view-btn {
  border: none; border-radius: 0; padding: 7px 10px;
  background: var(--glass);
}
#trail-history .view-btn.active { background: rgba(255,255,255,0.14); }
#trail-history .view-btn + .view-btn { border-left: 1px solid var(--border-soft); }

#btn-help,
#btn-settings {
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--glass); border: 1px solid var(--border-soft);
  color: var(--text-dim); cursor: pointer; font-size: 14px;
  transition: background-color .45s ease, color .45s ease;
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
#btn-help:hover,
#btn-settings:hover { color: var(--text); background: rgba(255,255,255,0.08); }

/* 右上角设置菜单：全局视角 / 真实光照 / 轨迹开关 */
#settings-panel {
  position: absolute; top: 40px; right: 0; z-index: 20;
  width: 176px;
  display: flex; flex-direction: column; gap: 6px;
  background: var(--glass-strong); border: 1px solid var(--border-soft);
  border-radius: 10px; padding: 12px 12px 10px;
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 8px 32px rgba(0,0,0,.35);
}
#settings-panel.hidden { display: none; }
.set-label {
  font-size: 10px; color: var(--text-dim); letter-spacing: 2px;
  margin: 2px 0 -2px;
}
#settings-panel .view-btn { width: 100%; }
#settings-panel #trail-history { width: 100%; }
/* 开关行：左侧文字 + 右侧拨动开关 */
.set-row {
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px; padding: 1px 2px;
  font-size: 12.5px; color: var(--text);
}
.switch {
  position: relative; flex: none;
  width: 34px; height: 19px; border-radius: 10px;
  background: rgba(255,255,255,0.12);
  border: 1px solid var(--border-soft);
  cursor: pointer; transition: background-color .4s ease, border-color .4s ease;
}
.switch::after {
  content: ""; position: absolute; top: 1px; left: 1px;
  width: 15px; height: 15px; border-radius: 50%;
  background: #aeb9c9;
  box-shadow: 0 1px 3px rgba(0,0,0,.45);
  transition: transform .35s ease, background .35s ease;
}
.switch:hover { background: rgba(255,255,255,0.18); }
.switch.on { background: rgba(127,178,255,0.40); border-color: rgba(127,178,255,0.55); }
.switch.on::after { transform: translateX(15px); background: #f0f6ff; }

/* ---------- HUD ---------- */
#hud {
  position: absolute; left: 16px; top: 72px; z-index: 9;
  background: var(--glass-strong); border: 1px solid var(--border-soft);
  border-radius: 8px; padding: 10px 14px;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  min-width: 210px;
}
#hud-date { font-size: 16px; font-weight: 600; color: var(--accent); letter-spacing: 0.5px; }
#hud-phase { font-size: 12px; color: var(--text); margin-top: 4px; }
#hud-dist { font-size: 11px; color: var(--text-dim); margin-top: 4px; }
#hud-vel { font-size: 11px; color: var(--text-dim); margin-top: 2px; }

/* ---------- 天体朝向与自转状态 ---------- */
#body-info {
  position: absolute; left: 16px; top: 172px; z-index: 9;
  background: var(--glass-strong); border: 1px solid var(--border-soft);
  border-radius: 8px; padding: 10px 14px;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  min-width: 210px; max-width: 260px;
}
#body-info.hidden { display: none; }
#bi-name { font-size: 14px; font-weight: 600; color: var(--accent); letter-spacing: 0.5px; }
#bi-rows { margin-top: 6px; }
#bi-rows .bi-row {
  display: flex; justify-content: space-between; gap: 12px;
  font-size: 11px; color: var(--text-dim); line-height: 1.9;
}
#bi-rows .bi-row b { color: var(--text); font-weight: 500; text-align: right; }

/* ---------- 事件卡 ---------- */
#event-card {
  position: absolute; right: 16px; top: 72px; z-index: 11;
  width: 330px; max-width: calc(100vw - 32px);
  background: var(--glass-strong); border: 1px solid var(--border-soft);
  border-radius: 10px; padding: 16px 18px;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 8px 32px rgba(0,0,0,.35);
  transition: opacity .25s, transform .25s;
}
#event-card.hidden { opacity: 0; transform: translateX(20px); pointer-events: none; }
#event-card::before {
  content: ""; position: absolute; left: 0; top: 14px; bottom: 14px; width: 3px;
  background: var(--accent2); border-radius: 2px;
}
#event-close {
  position: absolute; top: 8px; right: 10px;
  background: none; border: none; color: var(--text-dim);
  font-size: 18px; cursor: pointer;
  transition: color .35s ease;
}
#event-close:hover { color: var(--text); }
#event-date { font-size: 11.5px; color: var(--accent2); letter-spacing: 1px; }
#event-title { font-size: 16px; margin: 6px 0 8px; font-weight: 600; }
#event-text { font-size: 12.8px; line-height: 1.75; color: #c4d2e6; }

/* ---------- 事件列表 ---------- */
/* 面板本体左侧贴把手、右侧贴屏幕边缘，均取直角（圆角只保留在把手左端），避免拼接处露出缺口 */
#event-panel {
  position: absolute; right: 0; top: 130px; z-index: 9;
  width: 240px; max-height: calc(100vh - 310px);
  background: var(--glass-strong); border: 1px solid var(--border-soft);
  border-left: none; border-right: none; border-radius: 0;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  transition: transform .3s ease;
  display: flex; flex-direction: column;
}
#event-panel.collapsed { transform: translateX(240px); }
/* 窄竖排标签：收起时仅露出 36px 宽的侧边把手 */
#event-panel-head {
  position: absolute; left: -36px; top: 0; width: 36px; height: 100%;
  box-sizing: border-box;
  display: flex; flex-direction: column; align-items: center; justify-content: space-between;
  padding: 12px 0 8px;
  background: var(--glass-strong); border: 1px solid var(--border-soft);
  border-right: none; border-radius: 10px 0 0 10px;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  cursor: pointer;
  transition: background-color .45s ease;
}
#event-panel-head:hover { background: rgba(104, 109, 120, 0.55); }
#event-panel-head span {
  writing-mode: vertical-rl; text-orientation: upright;
  font-size: 13px; font-weight: 600; letter-spacing: 6px;
  color: var(--text);
}
#event-toggle {
  background: none; border: none; color: var(--text-dim);
  font-size: 15px; cursor: pointer; transition: transform .3s ease;
}
#event-panel.collapsed #event-toggle { transform: rotate(180deg); }
#event-list { overflow-y: auto; padding: 8px; }
#event-list::-webkit-scrollbar { width: 5px; }
#event-list::-webkit-scrollbar-thumb { background: rgba(255,255,255,.18); border-radius: 3px; }
.ev-item {
  padding: 8px 10px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--border-soft);
  margin-bottom: 6px; transition: background-color .35s ease;
}
.ev-item:hover { background: rgba(255,255,255,.06); }
.ev-item.current { background: rgba(255,179,128,.08); border-color: rgba(255,179,128,.35); }
.ev-item .ev-date { font-size: 10.5px; color: var(--text-dim); }
.ev-item .ev-title { font-size: 12.5px; color: var(--text); margin-top: 2px; }
.ev-item.current .ev-title { color: var(--accent2); }

/* ---------- 底部时间轴：播放键行（日期 | 播放/暂停 | 时分秒，位于速率控制上方）/ 速率 / 总时间条（进度最底层，事件节点叠加其上） ---------- */
#timeline-bar {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 12;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 8px 18px 12px;
  background: linear-gradient(to top, rgba(4,6,13,0.92), rgba(4,6,13,0));
}
/* 播放键行：日期在播放键左、时分秒在播放键右，字号一致；两侧等宽盒子（12ch 恰好容纳较宽的时分秒）保证播放键严格水平居中 */
#play-row {
  display: flex; align-items: center; gap: 16px;
}
#time-date, #time-hm {
  width: 12ch;
  font-family: Consolas, 'Courier New', monospace;
  font-size: 13px; font-weight: 600; line-height: 1;
  white-space: nowrap;
}
#time-date { text-align: right; color: var(--accent); }
#time-hm { text-align: left; color: var(--text); }

/* 总时间条：左半为倒退半程 + 右半为快进半程，贯穿屏幕的加粗毛玻璃横条（进度为最底层） */
#slider-wrap {
  position: relative; width: 100%; height: 34px;
  display: flex; align-items: center; cursor: pointer;
}
.slider-half {
  position: relative; flex: 1; height: 12px; overflow: hidden;
  background: var(--glass);
  border: 1px solid var(--border-soft);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
#slider-left { border-radius: 6px 0 0 6px; border-right: none; }
#slider-right { border-radius: 0 6px 6px 0; border-left: none; }
.slider-fill {
  position: absolute; left: 0; top: 0; bottom: 0; width: 0%;
  background: linear-gradient(90deg, #a9c4e8, #5f82ba);
  box-shadow: 0 0 10px rgba(95,130,186,.30);
}
#play-btn {
  flex: none;
  width: 42px; height: 42px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; line-height: 1;
  background: var(--glass-strong); border: 1px solid rgba(255,255,255,0.16);
  color: var(--text); font-size: 15px; cursor: pointer;
  transition: background-color .45s ease, color .45s ease, border-color .45s ease;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
/* 播放/暂停图标用内联 SVG 几何绘制（三角质心与双竖线组合中心均落在圆心），随 .playing 类切换 */
#play-btn .ic-pause { display: none; }
#play-btn.playing .ic-play { display: none; }
#play-btn.playing .ic-pause { display: block; }
#play-btn:hover { background: rgba(255,255,255,0.10); }
#play-btn.playing {
  background: rgba(255,179,128,0.85); border-color: rgba(255,179,128,0.9);
  color: #241505;
}
#slider-handle {
  position: absolute; top: 50%; width: 13px; height: 13px; z-index: 4;
  background: rgba(255,255,255,0.92); border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 8px rgba(255,255,255,.45);
  pointer-events: none;
}
/* 事件节点：叠加在总时间条上层的一排圆点（进度条为其底层），横向与时间条对位、可点击跳转 */
#slider-marks {
  position: absolute; inset: 0; z-index: 5;
  pointer-events: none;
}
.mark {
  position: absolute; top: 50%; width: 9px; height: 9px;
  transform: translate(-50%, -50%);
  background: rgba(255,179,128,0.40);
  border: 1px solid rgba(255,179,128,0.55);
  border-radius: 50%;
  cursor: pointer; pointer-events: auto;
  transition: background-color .35s ease, border-color .35s ease;
}
.mark:hover { background: rgba(255,255,255,0.62); border-color: rgba(255,255,255,0.72); }
.mark.past { background: rgba(255,255,255,0.55); border-color: rgba(255,255,255,0.65); }

/* 速率控制：播放键行与总时间条之间居中 */
#rate-wrap {
  width: 280px;
  display: flex; flex-direction: column; align-items: center; gap: 3px;
}
#rate-slider-wrap { position: relative; width: 100%; }
#rate-slider {
  -webkit-appearance: none; appearance: none;
  display: block;
  width: 100%; height: 4px; border-radius: 2px;
  background: rgba(255,255,255,.14); outline: none; cursor: pointer;
}
#rate-slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--accent2); border: 1px solid rgba(0,0,0,.35);
  box-shadow: 0 0 6px rgba(255,179,128,.4); cursor: pointer;
}
#rate-slider::-moz-range-thumb {
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--accent2); border: 1px solid rgba(0,0,0,.35); cursor: pointer;
}
/* 快进（正向）与后退（反向）之间的分割竖线 */
#rate-divider {
  position: absolute; left: 50%; top: -4px; bottom: -4px;
  width: 2px; transform: translateX(-50%);
  background: rgba(223,232,245,0.50);
  pointer-events: none;
  border-radius: 1px;
  box-shadow: 0 0 4px rgba(223,232,245,0.22);
}
#rate-label {
  font-size: 10px; color: var(--accent2); letter-spacing: 1.5px;
  font-family: Consolas, monospace;
  text-align: center;
}

@media (max-width: 900px) {
  #event-panel { display: none; }
  #rate-wrap { display: none; }
  #brand p { display: none; }
  #trail-history { display: none; }
}

/* ---------- 帮助 ---------- */
#help-modal {
  position: absolute; inset: 0; z-index: 30;
  background: rgba(2,4,10,.72);
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(4px);
}
#help-modal.hidden { display: none; }
#help-box {
  width: 460px; max-width: calc(100vw - 40px);
  background: var(--glass-strong); border: 1px solid var(--border-soft);
  border-radius: 12px; padding: 26px 30px;
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
}
#help-box h2 { font-size: 18px; margin-bottom: 14px; color: var(--accent); }
#help-box ul { list-style: none; margin-bottom: 14px; }
#help-box li { font-size: 13px; line-height: 2; color: #c4d2e6; }
#help-box li b { color: var(--accent2-soft); font-weight: 600; }
#help-box p { font-size: 12px; color: var(--text-dim); line-height: 1.7; margin-bottom: 16px; }
#help-github { text-align: center; }
#help-github a { color: var(--accent); text-decoration: none; }
#help-github a:hover { text-decoration: underline; }
#help-close {
  width: 100%; padding: 10px; border-radius: 8px;
  background: rgba(255,255,255,0.14); border: 1px solid rgba(255,255,255,0.22);
  color: var(--text);
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: background-color .45s ease;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
#help-close:hover { background: rgba(255,255,255,0.20); }

/* ---------- 加载 ---------- */
#loading {
  position: absolute; inset: 0; z-index: 40;
  background: var(--bg);
  display: flex; flex-direction: column; gap: 18px;
  align-items: center; justify-content: center;
  transition: opacity .5s;
}
#loading.done { opacity: 0; pointer-events: none; }
.load-ring {
  width: 46px; height: 46px; border-radius: 50%;
  border: 3px solid rgba(127,178,255,.15);
  border-top-color: var(--accent);
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
#loading-text { font-size: 13px; color: var(--text-dim); letter-spacing: 2px; }

/* 3D 标签容器 */
#labels { position: absolute; inset: 0; overflow: hidden; z-index: 5; pointer-events: none; }
.label {
  position: absolute; transform: translate(-50%, -130%);
  font-size: 11px; color: var(--text);
  text-shadow: 0 0 6px rgba(0,0,0,.9);
  pointer-events: auto; cursor: pointer;
  padding: 2px 5px;
  white-space: nowrap;
  transition: color .4s ease, opacity .35s;
}
.label:hover { color: #ffffff; }
.label.sc { color: var(--accent2); font-weight: 600; }
.label.sc:hover { color: #ffcf9e; }
/* Cassini 标签置于标记点下侧：刻度线朝上指向标记，与上侧的天体标签分离 */
.label.sc::after { display: none; }
.label.sc::before {
  content: ""; display: block; width: 1px; height: 10px;
  background: rgba(255,179,128,.45); margin: 0 auto 2px;
}
.label::after {
  content: ""; display: block; width: 1px; height: 10px;
  background: rgba(223,232,245,.4); margin: 2px auto 0;
}
.label.dim { opacity: .45; }
.label.hide { display: none; }