/* ============================================================
   太阳系 · 动态交互 3D 探索 — 样式
   ============================================================ */

:root {
  --bg: #05070f;
  --panel: rgba(13, 19, 34, 0.82);
  --panel-border: rgba(120, 170, 255, 0.18);
  --text: #e8edf7;
  --text-dim: #9fb0c8;
  --accent: #ffb52e;
  --accent2: #59c2ff;
  --star: #ffd88a;
  --rock: #d99b6b;
  --gas: #c8a06a;
  --ice: #7fd6e8;
  --dwarf: #c9a0e8;
  --belt: #a8b8c8;
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

#app { position: relative; width: 100%; height: 100%; }

#scene-container { position: absolute; inset: 0; }
#scene-container canvas { display: block; }

/* ---------- 顶部栏 ---------- */
.topbar {
  position: absolute;
  top: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px 18px;
  padding: 14px 18px;
  background: linear-gradient(180deg, rgba(5,8,16,0.75), rgba(5,8,16,0));
  pointer-events: none;
  z-index: 20;
}
.topbar > * { pointer-events: auto; }

.title h1 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 4px;
  background: linear-gradient(90deg, #ffe3a3, #ffb52e, #ff9d5c);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.title .subtitle {
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--text-dim);
  text-transform: uppercase;
}

.controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.control-group {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  background: rgba(13, 19, 34, 0.6);
  backdrop-filter: blur(8px);
}
.ctrl-label { font-size: 12px; color: var(--text-dim); white-space: nowrap; }
.speed-value {
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--accent2);
  min-width: 38px;
  text-align: right;
}
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 110px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent2), var(--accent));
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--accent2);
  box-shadow: 0 0 8px rgba(89, 194, 255, 0.8);
  cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%;
  background: #fff; border: 2px solid var(--accent2);
  box-shadow: 0 0 8px rgba(89, 194, 255, 0.8); cursor: pointer;
}

.ctrl-btn {
  padding: 7px 13px;
  font-size: 12px;
  color: var(--text-dim);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  background: rgba(13, 19, 34, 0.6);
  backdrop-filter: blur(8px);
  cursor: pointer;
  transition: all 0.18s ease;
  white-space: nowrap;
}
.ctrl-btn:hover { color: var(--text); border-color: rgba(120, 170, 255, 0.45); }
.ctrl-btn.active { color: #08111f; background: var(--accent2); border-color: var(--accent2); }

/* ---------- 底部导航条（两行：行星 / 飞行器） ---------- */
.bottom-nav {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  z-index: 20;
  background: linear-gradient(0deg, rgba(5,8,16,0.82), rgba(5,8,16,0));
}
.chip-bar {
  display: flex;
  gap: 8px;
  padding: 10px 18px;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
}
.chip-bar.spacecraft-bar { padding-top: 0; padding-bottom: 14px; }
.chip-bar::-webkit-scrollbar { height: 4px; }
.chip-bar::-webkit-scrollbar-thumb { background: rgba(120,170,255,0.3); border-radius: 2px; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  font-size: 13px;
  color: var(--text-dim);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  background: rgba(13, 19, 34, 0.65);
  backdrop-filter: blur(8px);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.18s ease;
}
.chip:hover { color: var(--text); border-color: rgba(120,170,255,0.5); transform: translateY(-2px); }
.chip.active {
  color: #08111f;
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 4px 18px rgba(255, 181, 46, 0.35);
}
.chip-dot { width: 9px; height: 9px; border-radius: 50%; flex: none; box-shadow: 0 0 6px currentColor; }
.chip.active .chip-dot { box-shadow: 0 0 6px rgba(0,0,0,0.5); }

/* ---------- 信息面板 ---------- */
.info-panel {
  position: absolute;
  top: 74px; right: 16px; bottom: 112px;
  width: min(400px, calc(100vw - 32px));
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  background: var(--panel);
  backdrop-filter: blur(14px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  transform: translateX(calc(100% + 24px));
  opacity: 0;
  transition: transform 0.32s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.32s ease;
  z-index: 30;
  display: flex;
  flex-direction: column;
}
.info-panel.open { transform: translateX(0); opacity: 1; }

.panel-close {
  position: absolute;
  top: 12px; right: 12px;
  width: 30px; height: 30px;
  font-size: 22px; line-height: 1;
  color: var(--text-dim);
  border: 1px solid var(--panel-border);
  border-radius: 50%;
  background: rgba(255,255,255,0.04);
  cursor: pointer;
  transition: all 0.18s ease;
  z-index: 2;
}
.panel-close:hover { color: #fff; background: rgba(255,255,255,0.12); }

.panel-content {
  flex: 1;
  overflow-y: auto;
  padding: 26px 24px 30px;
  scrollbar-width: thin;
  scrollbar-color: rgba(120,170,255,0.3) transparent;
}
.panel-content::-webkit-scrollbar { width: 6px; }
.panel-content::-webkit-scrollbar-thumb { background: rgba(120,170,255,0.3); border-radius: 3px; }

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 14px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--panel-border);
}
.panel-title h2 { font-size: 26px; font-weight: 700; letter-spacing: 2px; }
.panel-en { font-size: 13px; color: var(--text-dim); letter-spacing: 1px; }

.type-badge {
  flex: none;
  padding: 5px 11px;
  font-size: 12px;
  border-radius: 999px;
  white-space: nowrap;
  border: 1px solid transparent;
}
.kind-star .type-badge { color: #08111f; background: var(--star); border-color: var(--star); }
.kind-rock .type-badge { color: #08111f; background: var(--rock); border-color: var(--rock); }
.kind-gas  .type-badge { color: #08111f; background: var(--gas); border-color: var(--gas); }
.kind-ice  .type-badge { color: #08111f; background: var(--ice); border-color: var(--ice); }
.kind-dwarf .type-badge { color: #08111f; background: var(--dwarf); border-color: var(--dwarf); }
.kind-belt .type-badge { color: #08111f; background: var(--belt); border-color: var(--belt); }

.panel-desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-dim);
  margin-bottom: 16px;
}

/* 数据格子 */
.facts { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.fact {
  padding: 12px 14px;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
}
.fact-wide { grid-column: 1 / -1; }
.fact-label { font-size: 11px; color: var(--text-dim); margin-bottom: 5px; letter-spacing: 1px; }
.fact-value { font-size: 14px; font-weight: 600; line-height: 1.4; }
.fact-value.comps { display: flex; flex-wrap: wrap; gap: 6px; }
.fact-value.comps .chip {
  padding: 4px 10px;
  font-size: 12px;
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  background: rgba(120, 170, 255, 0.1);
  white-space: normal;
}
.fact-value.comps .chip:hover { transform: none; }

/* 星带专用 */
.belt-location {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--accent);
  border: 1px solid rgba(255, 181, 46, 0.25);
  border-radius: 12px;
  background: rgba(255, 181, 46, 0.07);
}
.section-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--accent2);
  margin: 18px 0 10px;
}
.intro-list { display: flex; flex-direction: column; gap: 10px; }
.intro-item {
  padding: 12px 14px;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
}
.intro-title { font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 5px; }
.intro-text { font-size: 12.5px; line-height: 1.65; color: var(--text-dim); }

.count-box {
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 700;
  color: #08111f;
  border-radius: 12px;
  background: linear-gradient(90deg, var(--accent), #ffd88a);
}

.belt-bodies { display: flex; flex-direction: column; gap: 10px; }
.belt-body {
  padding: 13px 15px;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
}
.belt-body-name { font-size: 14px; font-weight: 700; margin-bottom: 3px; }
.belt-body-meta { font-size: 12px; color: var(--accent2); margin-bottom: 6px; }
.belt-body-desc { font-size: 12.5px; line-height: 1.6; color: var(--text-dim); }

/* ---------- 3D 标签 ---------- */
.planet-label {
  padding: 3px 10px;
  font-size: 12px;
  color: var(--text);
  letter-spacing: 1px;
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  background: rgba(13, 19, 34, 0.55);
  backdrop-filter: blur(4px);
  white-space: nowrap;
  pointer-events: none;
  transition: all 0.18s ease;
}
.planet-label.is-major {
  color: #08111f;
  background: rgba(255, 181, 46, 0.85);
  border-color: rgba(255, 181, 46, 0.9);
}
.planet-label.hovered { background: var(--accent2); color: #08111f; border-color: var(--accent2); }

/* ---------- 提示与悬浮 tooltip ---------- */
.hint {
  position: absolute;
  left: 18px; bottom: 116px;
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 1px;
  opacity: 0.85;
  z-index: 15;
  pointer-events: none;
}
.tooltip {
  position: fixed;
  display: none;
  padding: 7px 12px;
  font-size: 12px;
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  background: rgba(13, 19, 34, 0.92);
  pointer-events: none;
  z-index: 50;
  white-space: nowrap;
}

/* ---------- 加载遮罩 ---------- */
.loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  background: radial-gradient(ellipse at center, #0a1122 0%, #05070f 70%);
  z-index: 100;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}
.loading.hidden { opacity: 0; visibility: hidden; }
.loading-spinner {
  width: 46px; height: 46px;
  border-radius: 50%;
  border: 3px solid rgba(255, 181, 46, 0.2);
  border-top-color: var(--accent);
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { font-size: 13px; color: var(--text-dim); letter-spacing: 3px; }

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  .topbar { padding: 10px 12px; }
  .title h1 { font-size: 18px; }
  .title .subtitle { display: none; }
  .control-group { padding: 6px 10px; }
  input[type="range"] { width: 80px; }
  .ctrl-btn { padding: 6px 10px; font-size: 11px; }

  .info-panel {
    top: auto;
    left: 12px; right: 12px; bottom: 88px;
    width: auto;
    max-height: 62vh;
    transform: translateY(calc(100% + 24px));
    border-radius: 18px;
  }
  .info-panel.open { transform: translateY(0); }

  .chip-bar { padding: 10px 12px 4px; }
  .chip-bar.spacecraft-bar { padding: 0 12px calc(10px + env(safe-area-inset-bottom)); }
  .hint { display: none; }
  .facts { grid-template-columns: 1fr; }
  .fact-wide { grid-column: auto; }
}

/* ---------- 小测验 ---------- */
.quiz-btn {
  color: #08111f;
  background: var(--accent);
  border-color: var(--accent);
  font-weight: 600;
}
.quiz-btn:hover { color: #08111f; background: #ffc766; border-color: #ffc766; }

.quiz-modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}
.quiz-modal.open { visibility: visible; opacity: 1; }
.quiz-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(3, 6, 14, 0.72);
  backdrop-filter: blur(4px);
}
.quiz-dialog {
  position: relative;
  width: min(640px, 100%);
  max-height: 86vh;
  overflow-y: auto;
  padding: 26px 24px;
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: 0 16px 60px rgba(0, 0, 0, 0.6);
  scrollbar-width: thin;
  scrollbar-color: rgba(120, 170, 255, 0.3) transparent;
}
.quiz-dialog::-webkit-scrollbar { width: 6px; }
.quiz-dialog::-webkit-scrollbar-thumb { background: rgba(120, 170, 255, 0.3); border-radius: 3px; }

.quiz-close {
  position: absolute;
  top: 14px; right: 14px;
  width: 30px; height: 30px;
  font-size: 22px; line-height: 1;
  color: var(--text-dim);
  border: 1px solid var(--panel-border);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  transition: all 0.18s ease;
}
.quiz-close:hover { color: #fff; background: rgba(255, 255, 255, 0.12); }

.quiz-title { font-size: 21px; font-weight: 700; letter-spacing: 2px; }
.quiz-sub { font-size: 12px; color: var(--text-dim); margin: 6px 0 4px; }

.quiz-question {
  margin: 16px 0;
  padding: 15px;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
}
.q-text { font-size: 14.5px; font-weight: 600; line-height: 1.5; margin-bottom: 11px; }
.q-num { color: var(--accent2); margin-right: 2px; }
.q-options { display: flex; flex-direction: column; gap: 8px; }
.q-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.16s ease;
}
.q-option:hover { border-color: rgba(120, 170, 255, 0.5); background: rgba(120, 170, 255, 0.06); }
.q-option input { accent-color: var(--accent2); cursor: pointer; }
.q-opt-label { font-size: 13.5px; line-height: 1.4; }
.q-option.correct { border-color: #3fd98a; background: rgba(63, 217, 138, 0.12); }
.q-option.wrong { border-color: #ff6b6b; background: rgba(255, 107, 107, 0.12); }
.q-explain {
  margin-top: 11px;
  font-size: 12.5px;
  line-height: 1.6;
  color: #a7e8c4;
  padding: 9px 12px;
  border-radius: 8px;
  background: rgba(63, 217, 138, 0.08);
}
.q-explain[hidden] { display: none; }

.quiz-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 6px;
}
.quiz-score { font-size: 15px; font-weight: 700; color: var(--accent); }
.quiz-submit {
  padding: 10px 22px;
  font-size: 14px;
  font-weight: 600;
  color: #08111f;
  background: var(--accent2);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.18s ease;
}
.quiz-submit:hover { background: #8ad4ff; }

/* ---------- 飞行器 ---------- */
.kind-spacecraft .type-badge { color: #08111f; background: #ffd166; border-color: #ffd166; }

.trajectory-marker {
  padding: 2px 8px;
  font-size: 10.5px;
  color: #08111f;
  background: rgba(255, 209, 102, 0.92);
  border-radius: 999px;
  white-space: nowrap;
  pointer-events: none;
}

.spacecraft-date {
  padding: 2px 8px;
  font-size: 10.5px;
  color: var(--text);
  background: rgba(13, 19, 34, 0.72);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  white-space: nowrap;
  pointer-events: none;
}

.timeline { display: flex; flex-direction: column; gap: 8px; }
.timeline-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 12px;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
}
.timeline-date {
  flex: none;
  min-width: 92px;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.5;
}
.timeline-event { font-size: 12.5px; color: var(--text); line-height: 1.5; }

.moon-label {
  padding: 1px 7px;
  font-size: 10px;
  color: var(--text);
  background: rgba(13, 19, 34, 0.65);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  white-space: nowrap;
  pointer-events: none;
}