/* 曹冲称象 · 三年级互动课件
 * 只在 lesson_chengxiang.js / chengxiang.html 中引用，不动 V3D 模板文件。
 */

:root {
  --cx-ink: #17324a;
  --cx-ink-soft: #44637d;
  --cx-primary: #2f7ff0;
  --cx-primary-dark: #1f63cc;
  --cx-warm: #ff6a3d;
  --cx-ok: #2faa6b;
  --cx-panel: rgba(255, 255, 255, 0.9);
  --cx-panel-line: rgba(255, 255, 255, 0.75);
  --cx-radius-l: 24px;
  --cx-radius-m: 14px;
  --cx-shadow: 0 18px 46px rgba(16, 42, 74, 0.2);
  --cx-font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: #a8d4f7;
  font-family: var(--cx-font);
  color: var(--cx-ink);
  -webkit-font-smoothing: antialiased;
}

/* ---------- 天空背景（V3D 画布透明，这里透出来） ---------- */
#cx-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(80% 55% at 80% 6%, rgba(255, 244, 205, 0.95) 0%, rgba(255, 244, 205, 0) 58%),
    radial-gradient(120% 80% at 12% 96%, rgba(226, 245, 255, 0.85) 0%, rgba(226, 245, 255, 0) 62%),
    linear-gradient(180deg, #7fc0f4 0%, #a5d6f8 26%, #cfe9fb 52%, #eaf4fb 72%, #fbf4e4 100%);
}

#cx-bg .cx-sun {
  position: absolute;
  top: 5%;
  right: 11%;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 252, 232, 0.95) 0%, rgba(255, 240, 190, 0.5) 38%, rgba(255, 235, 180, 0) 72%);
}

.cx-cloud {
  position: absolute;
  width: 210px;
  height: 62px;
  border-radius: 100px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 12px 30px rgba(110, 160, 210, 0.14);
  opacity: 0.9;
}

.cx-cloud::before,
.cx-cloud::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.94);
}

.cx-cloud::before {
  width: 96px;
  height: 96px;
  left: 26px;
  top: -46px;
}

.cx-cloud::after {
  width: 130px;
  height: 74px;
  right: 18px;
  top: -28px;
}

.cx-cloud.is-far {
  opacity: 0.55;
  transform: scale(0.78);
}

.cx-cloud.is-mid {
  opacity: 0.78;
  transform: scale(0.94);
}

@keyframes cx-drift {
  from {
    transform: translate3d(-30vw, 0, 0) scale(var(--cx-cloud-scale, 1));
  }
  to {
    transform: translate3d(120vw, 0, 0) scale(var(--cx-cloud-scale, 1));
  }
}

.cx-cloud.is-anim {
  animation: cx-drift linear infinite;
}

.cx-vignette {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(120% 95% at 50% 42%, rgba(255, 255, 255, 0) 58%, rgba(255, 255, 255, 0.42) 100%);
}

/* ---------- 3D 容器与 UI 层 ---------- */
#v3d-container {
  z-index: 1;
}

#cx-ui {
  position: absolute;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  font-family: var(--cx-font);
  opacity: 0;
  transition: opacity 0.5s ease;
}

#cx-ui.is-ready {
  opacity: 1;
}

#cx-ui button {
  font-family: inherit;
  cursor: pointer;
  pointer-events: auto;
}

/* 左上角小标题 */
.cx-brand {
  position: absolute;
  top: 16px;
  left: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 16px 9px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--cx-panel-line);
  box-shadow: 0 10px 26px rgba(16, 42, 74, 0.14);
  backdrop-filter: blur(10px);
}

.cx-brand b {
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 1px;
}

.cx-brand span {
  font-size: 14px;
  font-weight: 700;
  color: var(--cx-ink-soft);
}

/* ---------- 底部中间主面板 ---------- */
.cx-panel {
  position: absolute;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  width: min(640px, calc(100vw - 28px));
  padding: 14px 18px 16px;
  border-radius: var(--cx-radius-l);
  background: var(--cx-panel);
  border: 1px solid var(--cx-panel-line);
  box-shadow: var(--cx-shadow);
  backdrop-filter: blur(16px) saturate(1.15);
  pointer-events: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cx-panel.is-hidden {
  display: none;
}

.cx-panel::before {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  top: 0;
  height: 4px;
  border-radius: 0 0 8px 8px;
  background: linear-gradient(90deg, var(--cx-primary), #63c1ff 55%, var(--cx-warm));
  opacity: 0.85;
}

.cx-head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.cx-step {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 62px;
  height: 30px;
  padding: 0 10px;
  border-radius: 999px;
  background: rgba(47, 127, 240, 0.12);
  color: var(--cx-primary-dark);
  font-size: 15px;
  font-weight: 900;
}

.cx-title {
  flex: 1;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.5px;
}

.cx-dots {
  display: flex;
  gap: 6px;
  margin-right: 4px;
}

.cx-dots i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(47, 127, 240, 0.22);
}

.cx-dots i.is-on {
  background: var(--cx-primary);
}

.cx-dots i.is-now {
  background: var(--cx-warm);
  transform: scale(1.25);
}

.cx-tools {
  display: flex;
  gap: 6px;
}

.cx-tools button {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  border: 1px solid rgba(23, 50, 74, 0.1);
  background: rgba(255, 255, 255, 0.85);
  font-size: 17px;
  line-height: 1;
  color: var(--cx-ink-soft);
}

.cx-tools button:hover {
  background: #fff;
  color: var(--cx-primary-dark);
}

.cx-tools button.is-on {
  background: linear-gradient(180deg, #4a92f7, var(--cx-primary));
  border-color: rgba(20, 80, 190, 0.35);
  color: #fff;
}

.cx-tools button#cx-mode {
  width: auto;
  min-width: 54px;
  padding: 0 10px;
  font-size: 14px;
  font-weight: 900;
}

.cx-tools button#cx-record {
  width: auto;
  min-width: 46px;
  padding: 0 10px;
  font-size: 14px;
  font-weight: 900;
}

/* ---------- 称重记录表 ---------- */
.cx-record {
  border-radius: 16px;
  border: 1px solid rgba(23, 50, 74, 0.1);
  background: rgba(240, 248, 255, 0.72);
  padding: 8px 10px 9px;
}

.cx-record.is-hidden {
  display: none;
}

.cx-record-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  font-size: 15px;
  font-weight: 900;
  color: var(--cx-ink-soft);
  margin-bottom: 6px;
}

.cx-record-head b {
  font-size: 18px;
  color: var(--cx-primary-dark);
}

.cx-record-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px 12px;
  max-height: 120px;
  overflow-y: auto;
}

.cx-rec-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-size: 15px;
  font-weight: 700;
  color: var(--cx-ink-soft);
  padding: 2px 0;
}

.cx-rec-row b {
  font-size: 17px;
  color: var(--cx-warm);
}

.cx-rec-row i {
  margin-left: auto;
  font-style: normal;
  font-size: 13px;
  color: rgba(23, 50, 74, 0.5);
}

.cx-rec-empty {
  grid-column: 1 / -1;
  font-size: 14px;
  color: rgba(23, 50, 74, 0.45);
  font-weight: 700;
}

/* ---------- 悬停时的“xx 千克”小标签 ---------- */
.cx-chip {
  position: absolute;
  transform: translate(-50%, -50%);
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(23, 50, 74, 0.12);
  box-shadow: 0 6px 16px rgba(16, 42, 74, 0.18);
  font-size: 15px;
  font-weight: 900;
  color: var(--cx-warm);
  white-space: nowrap;
}

/* ---------- 结论块 ---------- */
.cx-conclusion {
  position: relative;
  margin: 16px 0 0;
  padding: 14px 14px 10px;
  border-radius: 16px;
  background: rgba(47, 127, 240, 0.08);
  border: 1px solid rgba(47, 127, 240, 0.16);
}

.cx-tag {
  position: absolute;
  top: -11px;
  left: 14px;
  padding: 2px 10px;
  border-radius: 999px;
  background: linear-gradient(180deg, #4a92f7, var(--cx-primary));
  color: #fff;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.5px;
}

.cx-rec-box {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 12px;
  margin: 8px 0 8px;
  max-height: 108px;
  overflow-y: auto;
}

.cx-hint {
  font-size: 17px;
  line-height: 1.55;
  color: var(--cx-ink-soft);
  font-weight: 600;
}

.cx-hint b {
  color: var(--cx-warm);
}

.cx-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.cx-btn {
  min-height: 46px;
  padding: 0 20px;
  border-radius: var(--cx-radius-m);
  border: 1px solid rgba(23, 50, 74, 0.12);
  background: #fff;
  color: var(--cx-ink);
  font-size: 18px;
  font-weight: 900;
  letter-spacing: 0.5px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.cx-btn:hover {
  transform: translateY(-1px);
}

.cx-btn:active {
  transform: translateY(1px) scale(0.99);
}

.cx-btn.cx-primary {
  background: linear-gradient(180deg, #4a92f7, var(--cx-primary) 60%, #2370e0);
  border-color: rgba(20, 80, 190, 0.35);
  color: #fff;
  box-shadow: 0 10px 24px rgba(47, 127, 240, 0.32);
}

.cx-btn.cx-warm {
  background: linear-gradient(180deg, #ff8a5c, var(--cx-warm) 60%, #ef5527);
  border-color: rgba(200, 70, 20, 0.32);
  color: #fff;
  box-shadow: 0 10px 24px rgba(255, 106, 61, 0.32);
}

.cx-btn.cx-ghost {
  background: rgba(255, 255, 255, 0.7);
  color: var(--cx-ink-soft);
  font-size: 16px;
  padding: 0 16px;
}

.cx-btn[disabled] {
  opacity: 0.45;
  cursor: default;
  transform: none;
  box-shadow: none;
}

/* KPI + 水位小标尺 */
.cx-kpis {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 10px;
  border-top: 1px dashed rgba(23, 50, 74, 0.14);
  font-size: 16px;
  font-weight: 800;
  color: var(--cx-ink-soft);
}

.cx-kpis .cx-kpi {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.cx-kpis .cx-kpi b {
  font-size: 21px;
  color: var(--cx-primary-dark);
}

.cx-kpis .cx-kpi.is-ok b {
  color: var(--cx-ok);
}

.cx-gauge {
  margin-left: auto;
  position: relative;
  width: 152px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(180deg, #eaf5ff 0%, #cfe7fb 46%, #9fd0f2 47%, #78bce8 100%);
  border: 1px solid rgba(23, 50, 74, 0.12);
  overflow: hidden;
  flex: none;
}

.cx-gauge i {
  position: absolute;
  left: 6px;
  right: 6px;
  height: 3px;
  border-radius: 3px;
}

.cx-gauge .cx-gauge-water {
  top: 21px;
  background: rgba(255, 255, 255, 0.9);
}

.cx-gauge .cx-gauge-mark {
  top: 21px;
  background: var(--cx-warm);
  box-shadow: 0 0 0 2px rgba(255, 106, 61, 0.24);
  transition: top 0.25s ease;
}

.cx-gauge.is-ok .cx-gauge-mark {
  background: var(--cx-ok);
  box-shadow: 0 0 0 2px rgba(47, 170, 107, 0.26);
}

.cx-gauge span {
  position: absolute;
  top: 4px;
  left: 8px;
  font-size: 12px;
  font-weight: 800;
  color: rgba(23, 50, 74, 0.55);
}

/* 面板收起后的悬浮按钮 */
.cx-show {
  position: absolute;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid var(--cx-panel-line);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--cx-shadow);
  backdrop-filter: blur(14px);
  font-size: 17px;
  font-weight: 900;
  color: var(--cx-primary-dark);
}

/* ---------- 跟随 3D 位置的浮动文字 ---------- */
.cx-pop-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.cx-pop {
  position: absolute;
  transform: translate(-50%, -50%);
  font-size: 30px;
  font-weight: 900;
  color: var(--cx-warm);
  text-shadow: 0 3px 0 #fff, 0 0 18px rgba(255, 255, 255, 0.9);
  white-space: nowrap;
}

.cx-pop.is-gain {
  font-size: 22px;
  color: #fff;
  text-shadow: 0 2px 0 rgba(31, 99, 204, 0.55), 0 0 14px rgba(255, 255, 255, 0.6);
}

.cx-pop.is-ok {
  font-size: 26px;
  color: var(--cx-ok);
}

/* ---------- 中央结算弹窗 ---------- */
.cx-modal {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(20, 44, 70, 0.28);
  backdrop-filter: blur(10px);
  pointer-events: auto;
}

.cx-modal[hidden] {
  display: none;
}

.cx-modal-card {
  width: min(520px, calc(100vw - 32px));
  max-height: calc(100vh - 48px);
  overflow: auto;
  padding: 22px 24px 24px;
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-shadow: 0 26px 60px rgba(12, 34, 60, 0.32);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.cx-modal-title {
  font-size: 24px;
  font-weight: 900;
  text-align: center;
}

.cx-modal-title small {
  display: block;
  margin-top: 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--cx-ink-soft);
}

.cx-eq {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 19px;
  font-weight: 800;
  color: var(--cx-ink-soft);
}

.cx-eq b {
  font-size: 26px;
  color: var(--cx-primary-dark);
}

.cx-eq b.cx-hot {
  color: var(--cx-warm);
}

.cx-eq.is-big {
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(47, 127, 240, 0.1);
  font-size: 20px;
}

.cx-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(23, 50, 74, 0.35);
  font-size: 20px;
}

.cx-modal ol {
  margin: 0;
  padding-left: 22px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--cx-ink-soft);
  font-weight: 600;
}

.cx-modal ol b {
  color: var(--cx-warm);
}

/* ---------- 移动端 ---------- */
@media (max-width: 640px) {
  .cx-brand {
    top: 10px;
    left: 10px;
    padding: 6px 12px 6px 10px;
  }

  .cx-brand b {
    font-size: 16px;
  }

  .cx-brand span {
    display: none;
  }

  .cx-panel {
    bottom: 10px;
    padding: 12px 13px 13px;
    border-radius: 20px;
    gap: 8px;
  }

  .cx-title {
    font-size: 19px;
  }

  .cx-step {
    min-width: 54px;
    height: 26px;
    font-size: 13px;
  }

  .cx-dots {
    display: none;
  }

  .cx-hint {
    font-size: 15px;
  }

  .cx-btn {
    min-height: 44px;
    font-size: 16px;
    padding: 0 15px;
  }

  .cx-kpis {
    font-size: 14px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .cx-kpis .cx-kpi b {
    font-size: 18px;
  }

  .cx-gauge {
    width: 100%;
    margin-left: 0;
  }

  .cx-pop {
    font-size: 24px;
  }

  .cx-modal-card {
    padding: 18px 16px 20px;
  }

  .cx-record-list,
  .cx-rec-box {
    grid-template-columns: minmax(0, 1fr);
    max-height: 96px;
  }

  .cx-tools button#cx-mode,
  .cx-tools button#cx-record {
    min-width: 44px;
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .cx-cloud.is-anim {
    animation: none;
  }

  #cx-ui,
  .cx-gauge .cx-gauge-mark {
    transition: none;
  }
}