/* ============================================================
   原子结构 3D 示意模型 —— 样式
   清爽蓝、白底、大按钮大字号、投屏可读、无深色模式
   布局：左侧 3D 区弹性填满整页高度；右侧控制面板独立滚动
   ============================================================ */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --blue: #2f80ed;
  --blue-dark: #1b5fc1;
  --blue-bg: #eef4fb;
  --text: #1c2b3a;
  --text-light: #55677a;
  --border: #d7e2ee;
  --green: #27ae60;
  --orange: #f2994a;
  --purple: #9b51e0;
  --red: #e74c3c;
  --card-shadow: 0 2px 10px rgba(31, 74, 129, 0.08);
  /* 页面上下固定占用：顶栏约 67px + 主区内边距 32px + 余量 */
  --page-offset: 102px;
}

html { font-size: 16px; }

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
  background: linear-gradient(180deg, #f6f9fd 0%, #eef4fb 100%);
  color: var(--text);
  min-height: 100vh;
}

.hidden { display: none !important; }

/* ---------------- 头部 ---------------- */
.app-header {
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(31, 74, 129, 0.08);
  position: sticky;
  top: 0;
  z-index: 60;
}
.header-inner {
  max-width: 98%;
  margin: 0 auto;
  padding: 10px 18px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 28px; height: 28px; border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #7fb2f5, var(--blue) 60%, var(--blue-dark));
  box-shadow: 0 0 0 4px rgba(47, 128, 237, 0.15);
  flex: none;
}
.brand h1 { font-size: 22px; color: var(--text); white-space: nowrap; }
.tabs { display: flex; gap: 8px; flex: 1; flex-wrap: wrap; }
.tab-btn {
  min-height: 46px;
  padding: 0 18px;
  font-size: 18px;
  border: 2px solid transparent;
  border-radius: 10px;
  background: var(--blue-bg);
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s;
}
.tab-btn:hover { background: #dceafa; }
.tab-btn.active {
  background: var(--blue);
  color: #fff;
  font-weight: bold;
  box-shadow: 0 3px 8px rgba(47, 128, 237, 0.35);
}
.header-actions { display: flex; gap: 8px; }

/* ---------------- 布局 ---------------- */
.app-main { max-width: 98%; margin: 0 auto; padding: 16px; }
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 400px;
  gap: 16px;
  align-items: start;
}
/* 左侧：3D 区弹性撑满整页高度，底部附属卡片保持自然高度 */
.stage-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
  min-height: calc(100vh - var(--page-offset));
}
/* 页②单视图外层容器：让内部 3D 舞台继续弹性伸展 */
#singleWrap { display: flex; flex-direction: column; flex: 1 1 auto; min-width: 0; }

.side {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-height: calc(100vh - var(--page-offset));
  overflow-y: auto;
  padding-bottom: 20px;
  padding-right: 6px;
}

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 18px;
  box-shadow: var(--card-shadow);
}
.card h2 {
  font-size: 19px;
  color: var(--blue-dark);
  margin-bottom: 10px;
  padding-left: 10px;
  border-left: 4px solid var(--blue);
}

/* ---------------- 3D 舞台 ---------------- */
.stage {
  position: relative;
  width: 100%;
  height: 480px;
  background: radial-gradient(circle at 50% 40%, #ffffff 0%, #eaf1f9 100%);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}
/* 主 3D 舞台：占据左侧剩余空间（随窗口高度自动放大）；矮屏时自动降低下限，避免整页滚动 */
.stage-tall {
  flex: 1 1 auto;
  min-height: min(450px, 46vh);
  height: auto;
}
/* 页③：α 散射展开时也让 3D 区优先保留较大高度 */
#view3 { min-height: min(420px, 44vh); }
.stage-cmp { height: 300px; border-radius: 10px; }
.stage canvas { display: block; position: absolute; inset: 0; width: 100%; height: 100%; touch-action: none; }

.stage-toolbar {
  position: absolute;
  top: 0; left: 0; right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 10px;
  z-index: 5;
  pointer-events: none;
  flex-wrap: wrap;
  gap: 6px;
}
.stage-toolbar .hint {
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 4px 12px;
  font-size: 14px;
  color: var(--text-light);
}
.toolbar-btns { display: flex; gap: 6px; pointer-events: auto; }

.stage-badge {
  position: absolute;
  bottom: 10px; left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  color: var(--text-light);
  font-size: 15px;
  padding: 4px 14px;
  border-radius: 16px;
  white-space: nowrap;
  max-width: 94%;
  overflow: hidden;
  text-overflow: ellipsis;
}
.stage-badge.warn {
  color: #8a5a00;
  background: #fff8e6;
  border-color: #f0d488;
}

/* 页③：模型示意图旁的“这是什么原子”标签 */
.stage-atom-tag {
  position: absolute;
  top: 50px; right: 10px;
  z-index: 5;
  pointer-events: none;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid #b9d7f5;
  border-radius: 16px;
  padding: 5px 14px;
  font-size: 15px;
  font-weight: bold;
  color: var(--blue-dark);
  max-width: 72%;
  line-height: 1.5;
  box-shadow: var(--card-shadow);
}

.note-bar {
  background: #fffdf3;
  border: 1px solid #f0d488;
  color: #8a5a00;
  border-radius: 10px;
  padding: 9px 14px;
  font-size: 16px;
}

/* 核放大浮层 */
.zoom-overlay {
  position: absolute;
  top: 52px; left: 10px;
  z-index: 6;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 14px;
  box-shadow: var(--card-shadow);
  max-width: 78%;
}
.zoom-overlay .zoom-title { font-size: 18px; font-weight: bold; margin-bottom: 6px; }
.zoom-overlay .zoom-legend { font-size: 15px; color: var(--text); margin-bottom: 4px; line-height: 1.8; }
.zoom-overlay .zoom-legend .dot {
  display: inline-block; width: 12px; height: 12px; border-radius: 50%;
  margin-right: 4px; vertical-align: -1px; border: 1px solid rgba(0,0,0,0.2);
}
.dot.p { background: #e74c3c; }
.dot.n { background: #9aa7b1; }

/* 降级提示层 */
.stage.degraded { display: flex; align-items: center; justify-content: center; }
.degrade-layer {
  text-align: center;
  background: #fff;
  border: 2px dashed #b8cbe4;
  border-radius: 12px;
  padding: 26px 30px;
  max-width: 92%;
  max-height: 92%;
  overflow: auto;
}
.degrade-title { font-size: 20px; font-weight: bold; color: #b9770e; margin-bottom: 10px; }
.degrade-reason { font-size: 17px; margin-bottom: 10px; }
.degrade-steps { text-align: left; display: inline-block; font-size: 16px; color: var(--text); line-height: 1.9; margin-bottom: 10px; }
.degrade-note { font-size: 15px; color: var(--green); }

/* ---------------- 按钮 / 表单 ---------------- */
.btn {
  min-height: 44px;
  padding: 0 16px;
  font-size: 17px;
  border: none;
  border-radius: 10px;
  background: var(--blue);
  color: #fff;
  cursor: pointer;
  transition: background 0.15s;
  font-family: inherit;
}
.btn:hover:not(:disabled) { background: var(--blue-dark); }
.btn:disabled { background: #c3d3e8; color: #fff; cursor: not-allowed; }
.btn-ghost {
  background: #fff;
  color: var(--blue-dark);
  border: 2px solid var(--blue);
}
.btn-ghost:hover:not(:disabled) { background: var(--blue-bg); }
.btn-small { min-height: 40px; font-size: 15px; padding: 0 12px; border-radius: 8px; }
.btn-wide { width: 100%; margin-top: 10px; font-size: 18px; }
.btn-step { min-width: 46px; min-height: 44px; font-size: 20px; padding: 0; border-radius: 10px; }

.select {
  min-height: 44px;
  font-size: 18px;
  padding: 0 10px;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  font-family: inherit;
  flex: 1;
}
.ctrl-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}
.ctrl-row:last-child { margin-bottom: 0; }
.ctrl-row label, .ctrl-label { font-size: 16px; color: var(--text-light); min-width: 112px; }
.ctrl-row.step { justify-content: space-between; }
.ctrl-row.wrap { flex-wrap: wrap; }
.stepper { display: flex; align-items: center; gap: 8px; }
.step-val {
  min-width: 56px;
  text-align: center;
  font-size: 24px;
  font-weight: bold;
  color: var(--blue-dark);
}
.preset-row { display: flex; flex-wrap: wrap; gap: 6px; flex: 1; }
.preset-row .btn { min-height: 38px; font-size: 15px; padding: 0 10px; border-radius: 8px; background: var(--blue-bg); color: var(--blue-dark); }
.preset-row .btn:hover { background: #dceafa; }

.check-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  margin: 8px 0;
  cursor: pointer;
}
.check-row input[type="checkbox"] { width: 20px; height: 20px; accent-color: var(--blue); cursor: pointer; }
input[type="range"] { flex: 1; accent-color: var(--blue); min-height: 30px; }

.seg { display: inline-flex; background: var(--blue-bg); border-radius: 10px; padding: 3px; gap: 3px; }
.seg-btn {
  min-height: 42px;
  padding: 0 16px;
  font-size: 17px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
}
.seg-btn.active { background: #fff; color: var(--blue-dark); font-weight: bold; box-shadow: 0 1px 4px rgba(31, 74, 129, 0.2); }

/* ---------------- 数值面板 ---------------- */
.panel .prow {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 4px;
  border-bottom: 1px dashed var(--border);
  font-size: 17px;
}
.panel .prow:last-child { border-bottom: none; }
.panel .prow span { color: var(--text-light); }
.panel .prow b { font-size: 19px; }
.panel-mini .prow { font-size: 15px; padding: 4px 2px; }
.panel-mini .prow b { font-size: 16px; }
.sh-dot { display: inline-block; width: 11px; height: 11px; border-radius: 50%; margin: 0 3px 0 8px; vertical-align: -1px; border: 1px solid rgba(0,0,0,0.15); }

.formula {
  margin-top: 10px;
  background: var(--blue-bg);
  border-radius: 10px;
  padding: 11px 12px;
  font-size: 22px;
  text-align: center;
  color: var(--blue-dark);
  font-weight: bold;
  letter-spacing: 1px;
}

.badges { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.badge {
  font-size: 15px;
  padding: 4px 12px;
  border-radius: 14px;
  border: 1px solid transparent;
}
.badge-atom { background: #e8f7ee; color: #1e7d43; border-color: #b9e6c9; }
.badge-ion { background: #fdeeee; color: #b03a2e; border-color: #f2c4c0; }
.badge-iso { background: #f4ecfb; color: #76409a; border-color: #d9c2ef; }
.badge-stable { background: #e8f4fd; color: #1b5fc1; border-color: #b9d7f5; }

/* ---------------- 实时解释 ---------------- */
.explain { font-size: 16px; line-height: 1.9; color: var(--text); }
.explain p { margin-bottom: 7px; }
.explain b { color: var(--blue-dark); }
.rep-note { margin-top: 8px; font-size: 15px; color: #8a5a00; background: #fff8e6; border: 1px solid #f0d488; border-radius: 8px; padding: 7px 11px; line-height: 1.75; }

/* ---------------- 手动排布 ---------------- */
.layer-btns { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 10px 0; }
.layer-btn { font-size: 18px; }
.layer-btn .cnt {
  display: inline-block;
  min-width: 26px;
  margin-left: 6px;
  background: rgba(255,255,255,0.3);
  border-radius: 8px;
  padding: 1px 6px;
}
.manual-actions { display: flex; gap: 8px; margin-bottom: 10px; }
.manual-msg {
  min-height: 22px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-light);
}
.manual-msg.err { color: var(--red); font-weight: bold; }
.manual-msg.ok { color: var(--green); font-weight: bold; }
.rule-list { margin: 8px 0 0 20px; font-size: 15px; color: var(--text-light); line-height: 1.9; }

/* ---------------- 2D 示意图与图例 ---------------- */
.diagram-row { display: grid; grid-template-columns: auto 1fr; gap: 14px; }
.diagram-box { display: flex; flex-direction: column; align-items: center; }
.diagram-title { font-size: 16px; color: var(--text-light); margin-bottom: 8px; }
/* 2D 图尺寸随视口高度自适应：矮屏压缩 2D 图，把纵向空间让给 3D 舞台 */
#canvas2d { height: clamp(220px, 28vh, 320px); width: auto; max-width: 100%; }
.legend-box { display: flex; flex-direction: column; }
.legend-box #btnExport2D { margin-top: auto; }
.lg-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 0;
  font-size: 16px;
  border-bottom: 1px dashed var(--border);
}
.lg-row:last-of-type { border-bottom: none; }
.lg-dot { width: 14px; height: 14px; border-radius: 50%; border: 1px solid rgba(0,0,0,0.15); flex: none; }
.lg-row b { margin-left: auto; font-size: 17px; color: var(--blue-dark); }
.lg-cap { font-size: 14px; color: var(--text-light); }
.mini-note { font-size: 15px; color: var(--text-light); line-height: 1.7; margin-top: 8px; }

/* ---------------- 对比模式 ---------------- */
.compare-presets {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
}
.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.cmp-head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; font-size: 18px; }
.cmp-tag { font-size: 14px; padding: 2px 10px; border-radius: 12px; color: #fff; }
.cmp-tag.left { background: var(--blue); }
.cmp-tag.right { background: var(--purple); }
.cmp-2d { display: block; margin: 10px auto 0; width: min(300px, 100%); height: auto; aspect-ratio: 1 / 1; }
.cmp-side .panel { margin-top: 10px; }

/* ---------------- 页签③ 时间轴与模型 ---------------- */
.timeline { display: flex; gap: 8px; flex-wrap: wrap; }
.tl-btn {
  flex: 1;
  min-width: 132px;
  min-height: 62px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  font-family: inherit;
  padding: 6px 4px;
  transition: all 0.15s;
}
.tl-btn:hover { border-color: var(--blue); }
.tl-btn.active { border-color: var(--blue); background: var(--blue-bg); box-shadow: 0 3px 8px rgba(47,128,237,0.2); }
.tl-year { font-size: 16px; font-weight: bold; color: var(--blue-dark); }
.tl-name { font-size: 17px; font-weight: bold; }
.tl-sci { font-size: 14px; color: var(--text-light); }
#modelInfo .mi-row { margin-bottom: 8px; font-size: 17px; line-height: 1.8; }
#modelInfo .mi-row b { color: var(--blue-dark); }
#modelEval { margin-top: 10px; }
#modelEval .ev-block { border-radius: 10px; padding: 10px 12px; font-size: 16px; line-height: 1.8; margin-bottom: 8px; }
#modelEval .ev-block.good { background: #e8f7ee; border: 1px solid #b9e6c9; }
#modelEval .ev-block.bad { background: #fdeeee; border: 1px solid #f2c4c0; }
#modelEval .ev-block b { display: block; margin-bottom: 4px; }

/* α 散射示意图：限制显示宽度，避免展开后过度占据纵向空间 */
.alpha-card .mini-note { margin-top: 6px; }
#alphaCanvas {
  width: 100%;
  max-width: 860px;
  max-height: 30vh;
  height: auto;
  margin: 0 auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  display: block;
}
.alpha-controls { display: flex; align-items: center; gap: 12px; margin-top: 10px; flex-wrap: wrap; }

/* ---------------- 数据表 ---------------- */
.data-table { width: 100%; border-collapse: collapse; font-size: 15.5px; margin-top: 10px; }
.data-table th, .data-table td { border: 1px solid var(--border); padding: 6px 8px; text-align: center; }
.data-table th { background: var(--blue-bg); color: var(--blue-dark); }
.data-table tr:nth-child(even) td { background: #fafcff; }

/* ---------------- 思考与讨论 ---------------- */
.rg-table-wrap { overflow-x: auto; margin-bottom: 12px; }
.disc-q { border-top: 1px dashed var(--border); padding-top: 10px; margin-top: 10px; }
.disc-q:first-of-type { border-top: none; }
.disc-title { font-size: 17px; font-weight: bold; line-height: 1.7; margin-bottom: 8px; }
.disc-btns { display: flex; gap: 8px; margin-bottom: 6px; }
.disc-a {
  font-size: 16px;
  line-height: 1.8;
  background: var(--blue-bg);
  border-radius: 8px;
  padding: 9px 11px;
  margin-bottom: 6px;
  color: var(--text);
}

/* ---------------- 模态 ---------------- */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(20, 40, 64, 0.45);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-box {
  background: #fff;
  border-radius: 16px;
  max-width: 680px;
  width: 100%;
  max-height: 86vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.25);
}
.modal-help { max-width: 860px; }
.modal-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 8px;
}
.modal-head h2 { font-size: 21px; color: var(--blue-dark); }
.modal-head-right { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.help-tabs { margin: 10px 18px 0; }
.modal-body { padding: 16px 20px; overflow-y: auto; font-size: 17px; line-height: 1.9; }
.modal-body p { margin-bottom: 8px; }
.modal-body ul { margin: 0 0 8px 22px; }
.modal-body li { margin-bottom: 5px; }
.modal-body h3 { margin: 10px 0 6px; color: var(--blue-dark); font-size: 19px; }
.modal-body b { color: var(--blue-dark); }

/* ---------------- 提示与横幅 ---------------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 40px;
  transform: translateX(-50%);
  background: rgba(28, 43, 58, 0.92);
  color: #fff;
  padding: 10px 22px;
  border-radius: 24px;
  font-size: 16px;
  z-index: 120;
  max-width: 90%;
}
.fps-banner {
  position: fixed;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  background: #fff8e6;
  border: 1px solid #f0d488;
  color: #8a5a00;
  border-radius: 12px;
  padding: 8px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 110;
  font-size: 16px;
  box-shadow: var(--card-shadow);
  flex-wrap: wrap;
  max-width: 94%;
}
.side-toggle {
  position: fixed;
  right: 14px;
  bottom: 14px;
  z-index: 90;
  min-height: 46px;
  box-shadow: 0 4px 14px rgba(47, 128, 237, 0.4);
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 1080px) {
  .layout { grid-template-columns: minmax(0, 1fr) 340px; }
  .stage-tall { min-height: 430px; }
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .stage-col { min-height: 0; }
  .stage { height: 380px; }
  .stage-tall { flex: 0 0 auto; height: 420px; min-height: 0; }
  #view3 { min-height: 0; }
  .diagram-row { grid-template-columns: 1fr; }
  .compare-grid { grid-template-columns: 1fr; }
  #canvas2d { width: 100%; max-width: 340px; height: auto; }
  .side-toggle { display: block; }
  .side { display: none; }
  .side.open { display: flex; }
  .brand h1 { font-size: 19px; }
  .tab-btn { font-size: 16px; padding: 0 12px; }
}
@media (min-width: 901px) {
  .side-toggle { display: none !important; }
}
@media (max-width: 560px) {
  .app-main { padding: 10px; }
  .step-val { font-size: 21px; }
  .stage-cmp { height: 240px; }
  .stage { height: 320px; }
  .stage-tall { height: 340px; }
  .card { padding: 14px 14px; }
}