/* ============================================================
   太阳系科普网站 —— 样式
   ============================================================ */

:root {
  --bg: #05060d;
  --panel-bg: rgba(13, 17, 33, 0.92);
  --panel-border: rgba(120, 160, 255, 0.18);
  --text: #e8edff;
  --text-dim: #9aa6c8;
  --accent: #6ea8ff;
  --accent-warm: #ffb347;
  --chip-bg: rgba(110, 168, 255, 0.12);
  --shadow: 0 8px 40px rgba(0, 0, 0, 0.6);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
          "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

html, body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}

#app { position: fixed; inset: 0; }

/* ---------- 画布 ---------- */
#sky {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
  touch-action: none;
}
#sky:active { cursor: grabbing; }

/* ---------- 顶部标题栏 ---------- */
#topbar {
  position: absolute;
  top: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  pointer-events: none;
  z-index: 10;
}
#topbar .title {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-shadow: 0 2px 12px rgba(0,0,0,0.8);
}
#topbar .title .sub {
  display: block;
  font-size: 11px;
  font-weight: 400;
  color: var(--text-dim);
  letter-spacing: 1px;
  margin-top: 2px;
}
#topbar .top-actions { pointer-events: auto; display: flex; gap: 8px; }

.icon-btn {
  pointer-events: auto;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  color: var(--text);
  border-radius: 9px;
  padding: 8px 12px;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
  backdrop-filter: blur(8px);
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}
.icon-btn:hover { background: rgba(110,168,255,0.18); border-color: var(--accent); }
.icon-btn:active { transform: scale(0.96); }

/* 缩放按钮：紧凑的方形 ＋ / － */
.icon-btn.zoom-btn {
  padding: 0;
  width: 34px;
  height: 34px;
  font-size: 19px;
  line-height: 1;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---------- 行星快速导航（左侧竖条） ---------- */
#planet-nav {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 6px;
  z-index: 10;
}
#planet-nav button {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  color: var(--text-dim);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 12px;
  cursor: pointer;
  text-align: left;
  min-width: 64px;
  backdrop-filter: blur(8px);
  transition: all 0.15s;
  display: flex; align-items: center; gap: 6px;
}
#planet-nav button .dot {
  width: 9px; height: 9px; border-radius: 50%;
  display: inline-block; flex: 0 0 auto;
  box-shadow: 0 0 6px currentColor;
}
#planet-nav button:hover { color: var(--text); border-color: var(--accent); transform: translateX(3px); }
#planet-nav button.active { color: var(--text); border-color: var(--accent); background: rgba(110,168,255,0.2); }

/* ---------- 底部控制栏 ---------- */
#controls {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 12px 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: min(680px, calc(100vw - 32px));
}
.ctrl-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

#play-btn {
  background: var(--accent);
  color: #04122e;
  border: none;
  border-radius: 50%;
  width: 42px; height: 42px;
  font-size: 17px;
  cursor: pointer;
  flex: 0 0 auto;
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.1s, background 0.15s;
}
#play-btn:hover { background: #8cbcff; }
#play-btn:active { transform: scale(0.94); }

.speed-wrap { flex: 1 1 auto; display: flex; flex-direction: column; gap: 3px; min-width: 200px; }
.speed-wrap .labels { display: flex; justify-content: space-between; font-size: 11px; color: var(--text-dim); }
.speed-wrap .labels b { color: var(--accent-warm); font-weight: 600; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 5px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--accent) 0%, #2a3a66 100%);
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--accent);
  box-shadow: 0 0 8px rgba(110,168,255,0.8);
}
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--accent);
}

.presets { display: flex; gap: 6px; flex: 0 0 auto; }
.presets button {
  background: var(--chip-bg);
  border: 1px solid transparent;
  color: var(--text-dim);
  border-radius: 7px;
  padding: 5px 9px;
  font-size: 11.5px;
  cursor: pointer;
  transition: all 0.15s;
}
.presets button:hover { color: var(--text); border-color: var(--accent); }
.presets button.active { background: var(--accent); color: #04122e; font-weight: 600; }

.toggles { display: flex; gap: 14px; flex-wrap: wrap; font-size: 12px; color: var(--text-dim); }
.toggles label { display: flex; align-items: center; gap: 5px; cursor: pointer; user-select: none; }
.toggles input { accent-color: var(--accent); cursor: pointer; }

/* ---------- 信息面板（右侧抽屉） ---------- */
#panel {
  position: absolute;
  top: 60px; right: 0;
  height: calc(100% - 60px);
  width: min(380px, 88vw);
  background: var(--panel-bg);
  border-left: 1px solid var(--panel-border);
  box-shadow: -10px 0 40px rgba(0,0,0,0.5);
  backdrop-filter: blur(14px);
  transform: translateX(100%);
  transition: transform 0.32s cubic-bezier(0.22, 1, 0.36, 1);
  z-index: 20;
  overflow-y: auto;
  padding: 22px 22px 40px;
}
#panel.open { transform: translateX(0); }

#panel .close {
  position: absolute;
  top: 16px; right: 16px;
  background: var(--chip-bg);
  border: none; color: var(--text);
  width: 30px; height: 30px;
  border-radius: 50%;
  font-size: 16px; cursor: pointer;
  transition: background 0.15s;
}
#panel .close:hover { background: rgba(255,90,90,0.3); }

#panel .p-symbol { font-size: 38px; line-height: 1; margin-bottom: 6px; }
#panel .p-name { font-size: 24px; font-weight: 700; }
#panel .p-name .en { font-size: 14px; color: var(--text-dim); font-weight: 400; margin-left: 8px; }
#panel .p-type {
  display: inline-block;
  margin-top: 8px;
  background: var(--chip-bg);
  color: var(--accent);
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
}
#panel .p-desc { margin-top: 16px; font-size: 13.5px; line-height: 1.7; color: #cfd6ee; }

#panel .stats {
  margin-top: 18px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--panel-border);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  overflow: hidden;
}
#panel .stats .cell { background: rgba(8,11,22,0.6); padding: 10px 12px; }
#panel .stats .cell .k { font-size: 11px; color: var(--text-dim); }
#panel .stats .cell .v { font-size: 14px; font-weight: 600; margin-top: 3px; }
#panel .stats .cell.full { grid-column: span 2; }

#panel h4 {
  margin-top: 22px; margin-bottom: 10px;
  font-size: 13px; color: var(--accent);
  letter-spacing: 0.5px;
  border-left: 3px solid var(--accent);
  padding-left: 8px;
}
#panel ul.facts { list-style: none; display: flex; flex-direction: column; gap: 8px; }
#panel ul.facts li {
  font-size: 13px; line-height: 1.55; color: #cfd6ee;
  padding-left: 18px; position: relative;
}
#panel ul.facts li::before {
  content: "✦"; position: absolute; left: 0; color: var(--accent-warm); font-size: 11px;
}

#panel .moons { display: flex; flex-direction: column; gap: 8px; }
#panel .moon-chip {
  background: rgba(8,11,22,0.6);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 10px 12px;
  cursor: pointer;
  transition: all 0.15s;
}
#panel .moon-chip:hover { border-color: var(--accent); background: rgba(110,168,255,0.1); }
#panel .moon-chip .mc-top { display: flex; align-items: center; gap: 8px; }
#panel .moon-chip .mc-dot { width: 11px; height: 11px; border-radius: 50%; box-shadow: 0 0 6px currentColor; }
#panel .moon-chip .mc-name { font-size: 13.5px; font-weight: 600; }
#panel .moon-chip .mc-name .en { color: var(--text-dim); font-weight: 400; font-size: 11px; margin-left: 5px; }
#panel .moon-chip .mc-meta { font-size: 11px; color: var(--text-dim); margin-top: 4px; }
#panel .moon-chip .mc-note { font-size: 12px; color: #bcc5e2; margin-top: 6px; line-height: 1.5; }

#panel .back-link {
  display: inline-block; margin-top: 4px; margin-bottom: 4px;
  color: var(--accent); font-size: 12.5px; cursor: pointer;
  background: none; border: none; padding: 0;
}
#panel .back-link:hover { text-decoration: underline; }

#panel .replay-btn {
  display: block; width: 100%;
  margin: 14px 0 4px;
  background: linear-gradient(135deg, #2dd4a0, #2aa6c4);
  color: #04122e; border: none; border-radius: 10px;
  padding: 11px; font-size: 13.5px; font-weight: 600; cursor: pointer;
  transition: filter 0.15s, transform 0.1s;
}
#panel .replay-btn:hover { filter: brightness(1.1); }
#panel .replay-btn:active { transform: scale(0.98); }

#planet-nav button.voy-nav { margin-top: 6px; border-color: rgba(95, 224, 176, 0.45); }

/* ---------- 帮助浮层 ---------- */
#help {
  position: absolute;
  inset: 0;
  background: rgba(3, 5, 12, 0.82);
  backdrop-filter: blur(6px);
  z-index: 50;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
#help.show { display: flex; }
#help .card {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  padding: 30px 32px;
  max-width: 460px;
  box-shadow: var(--shadow);
}
#help .card h2 { font-size: 22px; margin-bottom: 6px; }
#help .card .lead { color: var(--text-dim); font-size: 13px; margin-bottom: 18px; line-height: 1.6; }
#help .card ul { list-style: none; display: flex; flex-direction: column; gap: 11px; }
#help .card li { font-size: 13.5px; line-height: 1.55; display: flex; gap: 10px; align-items: flex-start; }
#help .card li .ico { font-size: 16px; flex: 0 0 24px; text-align: center; }
#help .card .key {
  background: var(--chip-bg); border: 1px solid var(--panel-border);
  border-radius: 5px; padding: 1px 7px; font-size: 12px; font-family: monospace;
}
#help .card button {
  margin-top: 22px; width: 100%;
  background: var(--accent); color: #04122e;
  border: none; border-radius: 10px;
  padding: 11px; font-size: 14px; font-weight: 600; cursor: pointer;
}
#help .card button:hover { background: #8cbcff; }

/* ---------- 浮动时间 / 提示 ---------- */
#clock {
  position: absolute;
  top: 60px; left: 20px;
  font-size: 12px;
  color: var(--text-dim);
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 9px;
  padding: 7px 12px;
  z-index: 9;
  backdrop-filter: blur(8px);
  pointer-events: none;
  line-height: 1.6;
}
#clock b { color: var(--text); font-weight: 600; }

#hint {
  position: absolute;
  bottom: 110px; left: 50%; transform: translateX(-50%);
  font-size: 12px; color: var(--text-dim);
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  padding: 6px 14px; border-radius: 20px;
  z-index: 9; pointer-events: none;
  opacity: 0; transition: opacity 0.4s;
}
#hint.show { opacity: 1; }

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  #planet-nav { display: none; }
  #topbar { padding: 12px 14px; }
  #topbar .title { font-size: 17px; }
  #topbar .title .sub { display: none; }
  #clock { top: 52px; font-size: 11px; }
  #controls { padding: 10px 12px; }
  .toggles { gap: 10px; font-size: 11px; }
  #panel { top: 52px; height: calc(100% - 52px); }
}