/* 小动物过河 —— 课件 UI（配合 Verge3D 默认模板 + 透明背景画布） */

:root {
  --am-ink: #23384a;
  --am-ink-soft: rgba(35, 56, 74, .62);
  --am-brand: #4d87ff;
  --am-brand-deep: #2f6dff;
  --am-ok: #1f9d67;
  --am-bad: #e2574c;
  --am-panel: rgba(255, 255, 255, .88);
  --am-line: rgba(35, 56, 74, .10);
  --am-shadow: 0 18px 40px rgba(31, 63, 90, .16);
  --am-radius-panel: 22px;
  --am-radius-ctl: 14px;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  overflow: hidden;
  color: var(--am-ink);
  background: #e9f5ff;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

noscript {
  display: block;
  padding-top: 100px;
  text-align: center;
  font-size: 20px;
}

/* ---------------------------------------------------------------
   页面背景：三维画布是透明的，这一层就是课件的“底图”
   --------------------------------------------------------------- */
#v3d-container {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background-color: #e9f5ff;
  background-image:
    radial-gradient(120% 85% at 12% 4%, rgba(255, 255, 255, .95) 0%, rgba(255, 255, 255, .30) 40%, rgba(255, 255, 255, 0) 64%),
    radial-gradient(75% 55% at 88% 8%, rgba(255, 208, 138, .50) 0%, rgba(255, 208, 138, 0) 62%),
    radial-gradient(120% 90% at 50% 114%, rgba(96, 196, 150, .40) 0%, rgba(96, 196, 150, 0) 58%),
    linear-gradient(178deg, #dbeeff 0%, #e7f6ef 38%, #f5f3e5 72%, #fdf7ea 100%);
  background-repeat: no-repeat;
}

/* 远山 + 河岸剪影，压得很淡，只做层次 */
#v3d-container::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 44%;
  z-index: 0;
  pointer-events: none;
  opacity: .55;
  background-repeat: no-repeat;
  background-position: bottom center;
  background-size: 100% 100%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 420' preserveAspectRatio='none'%3E%3Cpath d='M0 300C150 252 250 302 370 268 480 236 560 288 690 260 800 236 900 278 1010 252 1100 231 1160 264 1200 248L1200 420 0 420Z' fill='%23c2e6cf' fill-opacity='.5'/%3E%3Cpath d='M0 344C120 318 220 352 330 332 450 310 540 346 660 324 780 302 880 340 1000 320 1100 303 1150 330 1200 317L1200 420 0 420Z' fill='%2398cfb0' fill-opacity='.5'/%3E%3C/svg%3E");
}

/* 画面暗角 + 顶部柔光，让中间的沙盘更聚焦 */
#v3d-container::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  background:
    radial-gradient(118% 78% at 50% 46%, rgba(255, 255, 255, 0) 54%, rgba(28, 58, 84, .10) 100%),
    linear-gradient(180deg, rgba(255, 255, 255, .32) 0%, rgba(255, 255, 255, 0) 20%);
}

/* 三维画布：压在背景之上、UI 之下 */
#v3d-container > canvas {
  position: absolute !important;
  inset: 0;
  z-index: 1;
  touch-action: none;
}

/* ---------------------------------------------------------------
   全屏按钮（沿用模板，换一个更柔和的样式）
   --------------------------------------------------------------- */
.fullscreen-button {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 44px;
  height: 44px;
  z-index: 6;
  display: none;
  cursor: pointer;
  border-radius: 14px;
  background-color: rgba(255, 255, 255, .82);
  border: 1px solid var(--am-line);
  backdrop-filter: blur(10px);
  background-repeat: no-repeat;
  background-position: center;
  background-size: 22px 22px;
}

.fullscreen-open {
  background-image: url('media/fullscreen_open.svg');
}

.fullscreen-close {
  background-image: url('media/fullscreen_close.svg');
}

.v3d-simple-preloader-logo {
  background-image: url('media/logo180.png');
}

/* ---------------------------------------------------------------
   底部居中的可折叠面板
   --------------------------------------------------------------- */
.ui-hidden #am-ui {
  display: none;
}

.am-ui {
  position: absolute;
  left: 50%;
  bottom: 20px;
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  transform: translateX(-50%);
  pointer-events: none;
}

.am-ui,
.am-ui * {
  box-sizing: border-box;
}

.am-ui > * {
  pointer-events: auto;
}

.am-panel {
  width: min(660px, calc(100vw - 28px));
  padding: 34px 16px 12px;
  border-radius: var(--am-radius-panel);
  background: var(--am-panel);
  border: 1px solid rgba(255, 255, 255, .72);
  box-shadow: var(--am-shadow);
  backdrop-filter: blur(14px) saturate(1.05);
}

.am-row {
  display: flex;
  align-items: center;
  gap: 16px;
}

.am-btn {
  flex: 0 0 auto;
  min-height: 48px;
  padding: 0 24px;
  border: 0;
  border-radius: var(--am-radius-ctl);
  font-family: inherit;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: .02em;
  color: #fff;
  cursor: pointer;
  background-image: linear-gradient(180deg, var(--am-brand) 0%, var(--am-brand-deep) 100%);
  box-shadow: 0 8px 18px rgba(47, 109, 255, .28);
  transition: transform .16s ease, box-shadow .16s ease, filter .16s ease;
}

.am-btn:hover {
  filter: brightness(1.04);
  transform: translateY(-1px);
  box-shadow: 0 10px 22px rgba(47, 109, 255, .32);
}

.am-btn:active {
  transform: translateY(0);
  box-shadow: 0 4px 12px rgba(47, 109, 255, .24);
}

.am-kpis {
  display: flex;
  flex: 1 1 auto;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

.am-kpi {
  min-width: 84px;
  padding: 6px 12px;
  border-radius: 14px;
  background: rgba(77, 135, 255, .10);
  border: 1px solid rgba(77, 135, 255, .18);
  text-align: center;
}

.am-kpi--ok {
  background: rgba(31, 157, 103, .12);
  border-color: rgba(31, 157, 103, .22);
}

.am-kpi--bad {
  background: rgba(226, 87, 76, .10);
  border-color: rgba(226, 87, 76, .20);
}

.am-kpi--time {
  background: rgba(240, 163, 67, .12);
  border-color: rgba(240, 163, 67, .24);
}

.am-kpi-label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--am-ink-soft);
  line-height: 1.5;
}

.am-kpi-value {
  display: block;
  font-size: 20px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  line-height: 1.35;
}

.am-hint {
  margin-top: 10px;
  font-size: 15px;
  font-weight: 600;
  color: var(--am-ink-soft);
  text-align: center;
  line-height: 1.5;
}

.am-meta {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-top: 10px;
}

.am-meta .am-hint {
  flex: 1 1 auto;
  margin-top: 0;
  text-align: left;
}

.am-acc {
  flex: 0 0 auto;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(35, 56, 74, .06);
  font-size: 13px;
  font-weight: 800;
  color: var(--am-ink-soft);
  white-space: nowrap;
}

/* 出题模式切换：顺序（教材排法） / 随机 */
.am-mode {
  display: inline-flex;
  flex: 0 0 auto;
  padding: 3px;
  border-radius: 999px;
  background: rgba(35, 56, 74, .07);
}

.am-mode-btn {
  min-width: 52px;
  height: 30px;
  padding: 0 12px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  font-family: inherit;
  font-size: 14px;
  font-weight: 800;
  color: var(--am-ink-soft);
  cursor: pointer;
  transition: background .16s ease, color .16s ease;
}

.am-mode-btn.is-on {
  background: var(--am-brand-deep);
  color: #fff;
  box-shadow: 0 4px 10px rgba(47, 109, 255, .28);
}

.am-icon-btn {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: 12px;
  border: 1px solid rgba(35, 56, 74, .10);
  background: rgba(255, 255, 255, .78);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  transition: transform .16s ease, background .16s ease;
}

.am-icon-btn:hover {
  transform: translateY(-1px);
  background: #fff;
}

.am-icon-btn.is-off {
  background: rgba(226, 87, 76, .10);
  border-color: rgba(226, 87, 76, .26);
}


/* 同一得数三种表达的合成提示 */
.am-equiv {
  position: absolute;
  left: 50%;
  top: 11%;
  z-index: 7;
  padding: 12px 22px;
  border-radius: 18px;
  background: rgba(255, 255, 255, .94);
  border: 1px solid rgba(47, 109, 255, .30);
  box-shadow: 0 18px 40px rgba(31, 63, 90, .18);
  font-size: 22px;
  font-weight: 900;
  color: var(--am-brand-deep);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -10px) scale(.96);
  transition: opacity .22s ease, transform .22s ease;
}

.am-equiv.is-on {
  opacity: 1;
  transform: translate(-50%, 0) scale(1);
}

.am-hint.is-ok {
  color: var(--am-ok);
}

.am-hint.is-bad {
  color: var(--am-bad);
}

.am-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  margin-bottom: -22px;
  z-index: 2;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, .72);
  background: rgba(255, 255, 255, .80);
  box-shadow: 0 10px 24px rgba(31, 63, 90, .14);
  backdrop-filter: blur(12px);
  font-family: inherit;
  font-size: 16px;
  font-weight: 800;
  color: var(--am-ink);
  cursor: pointer;
  transition: transform .16s ease, background .16s ease;
}

.am-toggle:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, .92);
}

.am-toggle-icon {
  font-size: 17px;
  line-height: 1;
}

.am-toggle-arrow {
  font-size: 13px;
  line-height: 1;
  color: var(--am-brand-deep);
}

/* 折叠态：只留一个小把手 */
.am-ui.is-collapsed .am-panel {
  display: none;
}

.am-done-banner {
  position: absolute;
  left: 50%;
  top: 21%;
  z-index: 7;
  transform: translateX(-50%);
  padding: 14px 28px;
  border-radius: 20px;
  background: rgba(255, 255, 255, .92);
  border: 1px solid rgba(31, 157, 103, .28);
  box-shadow: 0 18px 40px rgba(31, 63, 90, .18);
  font-size: 22px;
  font-weight: 900;
  color: var(--am-ok);
  text-align: center;
  pointer-events: none;
}

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

/* ---------------------------------------------------------------
   响应式：平板 / 手机
   --------------------------------------------------------------- */
@media (max-width: 760px), (max-height: 620px) {
  .am-ui {
    bottom: 12px;
    gap: 8px;
  }

  .am-panel {
    width: min(560px, calc(100vw - 20px));
    padding: 30px 12px 8px;
    border-radius: 18px;
  }

  .am-row {
    gap: 10px;
  }

  .am-btn {
    min-height: 44px;
    padding: 0 18px;
    font-size: 16px;
  }

  .am-kpi {
    min-width: 68px;
    padding: 4px 8px;
  }

  .am-kpi-value {
    font-size: 17px;
  }

  .am-hint {
    margin-top: 8px;
    font-size: 14px;
  }
}

@media (max-width: 520px) {
  .am-toggle {
    min-height: 40px;
    padding: 0 14px;
    margin-bottom: -20px;
    font-size: 15px;
  }
}

/* 真正窄的屏（手机）：主按钮单独一行居中，KPI 四等分铺满 */
@media (max-width: 560px) {
  .am-row {
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
  }

  .am-btn {
    flex: 0 0 auto;
    min-width: 150px;
    min-height: 42px;
    padding: 0 22px;
  }

  .am-kpis {
    flex: 1 1 100%;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
  }

  .am-kpi {
    min-width: 0;
    padding: 4px 6px;
  }

  .am-kpi-label {
    font-size: 12px;
  }

  .am-kpi-value {
    font-size: 17px;
  }

  .am-meta {
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px 10px;
  }

  .am-meta .am-hint {
    flex: 1 1 100%;
    text-align: center;
  }
}

/* 竖屏：只调面板宽度和弹层位置，布局交给上面的宽度断点 */
@media (orientation: portrait) {
  .am-ui {
    bottom: 10px;
  }

  .am-panel {
    width: min(660px, calc(100vw - 20px));
    padding: 28px 10px 6px;
  }

  .am-equiv {
    top: 8%;
    max-width: calc(100vw - 20px);
    padding: 10px 16px;
    font-size: 18px;
    white-space: normal;
    text-align: center;
  }

  .am-done-banner {
    top: 16%;
    max-width: calc(100vw - 24px);
    font-size: 19px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .am-btn,
  .am-toggle {
    transition: none;
  }
}

/* 去掉 iOS 点击高亮 */
* {
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}