/* 课堂互动摇号器 · 纯本地，无第三方依赖 */
.classroom-section {
  padding: 34px 0 12px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 80px;
}
.classroom-launch {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 24px;
  padding: 26px;
  border: 1px solid #D9D1FF;
  border-radius: 16px;
  background: linear-gradient(135deg, #F4F1FF 0%, #FFF7E8 62%, #FFE9D6 100%);
  box-shadow: 0 8px 24px rgba(99,91,255,.08);
}
.classroom-launch-copy { display: flex; align-items: flex-start; gap: 16px; min-width: 0; }
.classroom-launch-icon {
  width: 52px; height: 52px; flex: 0 0 52px; border-radius: 14px;
  display: grid; place-items: center; font-size: 26px;
  background: linear-gradient(135deg, #635BFF, #8B5CF6); color: #fff;
  box-shadow: 0 8px 18px rgba(99,91,255,.22);
}
.classroom-launch h2 { margin: 0 0 6px; color: var(--text); font-size: 22px; }
.classroom-launch p { margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.7; }
.classroom-launch-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.classroom-launch-tags span { padding: 3px 9px; border-radius: 99px; background: rgba(255,255,255,.72); color: #4F46E5; font-size: 11.5px; border: 1px solid rgba(99,91,255,.13); }
.classroom-open-btn, .picker-primary, .picker-secondary, .picker-ghost {
  border: 0; cursor: pointer; font: inherit; border-radius: 10px; transition: transform .15s, box-shadow .15s, background .15s;
}
.classroom-open-btn {
  min-width: 146px; padding: 12px 18px; color: #fff; font-weight: 700;
  background: linear-gradient(135deg, #635BFF, #7C3AED);
  box-shadow: 0 7px 16px rgba(99,91,255,.24);
}
.classroom-open-btn:hover, .picker-primary:hover { transform: translateY(-1px); box-shadow: 0 9px 22px rgba(99,91,255,.3); }

.classroom-picker-dialog {
  width: min(1040px, calc(100vw - 28px)); max-height: calc(100vh - 28px);
  padding: 0; border: 0; border-radius: 18px; color: var(--text);
  background: var(--bg); box-shadow: 0 24px 80px rgba(31,26,20,.28); overflow: hidden;
}
.classroom-picker-dialog::backdrop { background: rgba(31,26,20,.58); backdrop-filter: blur(5px); }
.picker-shell { max-height: calc(100vh - 28px); overflow-y: auto; }
.picker-shell:fullscreen {
  width: 100vw; height: 100vh; max-height: none; overflow-y: auto;
  background: var(--bg); border-radius: 0;
}
.picker-shell:fullscreen .picker-body { min-height: calc(100vh - 67px); }
.picker-shell:fullscreen .picker-head { border-radius: 0; }
.classroom-picker-dialog.is-app-fullscreen {
  position: fixed; inset: 0; width: 100vw; height: 100vh; max-width: none; max-height: none;
  margin: 0; border-radius: 0;
}
.classroom-picker-dialog.is-app-fullscreen .picker-shell { width: 100%; height: 100%; max-height: none; }
.classroom-picker-dialog.is-app-fullscreen .picker-body { min-height: calc(100vh - 67px); }
.picker-head {
  position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 12px;
  padding: 14px 18px; background: rgba(247,239,220,.96); border-bottom: 1px solid var(--line);
}
.picker-head-title { flex: 1; min-width: 0; }
.picker-head-title strong { display: block; font-size: 17px; }
.picker-head-title small { color: var(--muted); }
.picker-icon-btn { width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 9px; background: var(--bg); color: var(--text); cursor: pointer; font-size: 17px; }
.picker-body { display: grid; grid-template-columns: 300px minmax(0, 1fr); min-height: 560px; }
.picker-settings { display: block; padding: 20px; background: var(--bg-soft); border-right: 1px solid var(--line); }
.picker-settings h3, .picker-history h3 { margin: 0 0 14px; font-size: 14px; color: var(--text); }
.picker-field { display: grid; gap: 6px; margin-bottom: 14px; }
.picker-field label, .picker-check { font-size: 12.5px; font-weight: 600; color: var(--text); }
.picker-field input, .picker-field select {
  width: 100%; height: 40px; padding: 7px 10px; border: 1px solid var(--line);
  border-radius: 8px; background: var(--bg); color: var(--text); font: inherit; font-size: 14px;
}
.picker-field input:focus, .picker-field select:focus { outline: 3px solid rgba(99,91,255,.14); border-color: #635BFF; }
.picker-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.picker-hint { color: var(--muted); font-size: 11px; line-height: 1.55; }
.picker-check { display: flex; align-items: center; gap: 8px; margin: 12px 0; cursor: pointer; }
.picker-check input { width: 17px; height: 17px; accent-color: #635BFF; }
.picker-settings-actions { display: flex; gap: 8px; margin-top: 16px; }
.picker-secondary, .picker-ghost { padding: 9px 12px; border: 1px solid var(--line); background: var(--bg); color: var(--text); font-size: 12.5px; }
.picker-secondary:hover, .picker-ghost:hover { border-color: #635BFF; color: #635BFF; }
.picker-history { margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--line); }
.picker-history-list { display: flex; flex-wrap: wrap; gap: 7px; min-height: 29px; }
.picker-history-list span { min-width: 29px; padding: 4px 8px; text-align: center; border-radius: 8px; background: #ECE7FF; color: #4F46E5; font-weight: 700; font-size: 12px; }
.picker-history-empty { color: var(--muted) !important; background: transparent !important; font-weight: 400 !important; padding-left: 0 !important; }

.picker-stage { position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 30px; overflow: hidden; background: radial-gradient(circle at 50% 35%, #FFFFFF 0%, #FFFCF6 56%, #FFF7E8 100%); }
.picker-stage::before, .picker-stage::after { content: ''; position: absolute; width: 220px; height: 220px; border-radius: 50%; filter: blur(2px); pointer-events: none; }
.picker-stage::before { top: -110px; right: -80px; background: rgba(99,91,255,.08); }
.picker-stage::after { bottom: -120px; left: -80px; background: rgba(244,124,60,.09); }
.picker-status { position: relative; z-index: 1; min-height: 24px; margin-bottom: 12px; color: var(--muted); font-size: 14px; text-align: center; }
.picker-ball {
  position: relative; z-index: 1; width: clamp(190px, 28vw, 270px); aspect-ratio: 1;
  display: grid; place-items: center; border-radius: 50%; color: #fff;
  background: radial-gradient(circle at 34% 25%, #A78BFA 0%, #7C3AED 34%, #4F46E5 74%, #3730A3 100%);
  box-shadow: inset -16px -20px 35px rgba(36,20,90,.28), inset 12px 12px 30px rgba(255,255,255,.22), 0 22px 45px rgba(79,70,229,.27);
}
.picker-ball::after { content: ''; position: absolute; top: 12%; left: 19%; width: 25%; height: 13%; border-radius: 50%; background: rgba(255,255,255,.28); transform: rotate(-25deg); }
.picker-number { font-size: clamp(66px, 11vw, 112px); line-height: 1; font-weight: 900; letter-spacing: -.05em; text-shadow: 0 5px 18px rgba(0,0,0,.22); }
.picker-ball.is-rolling { animation: pickerPulse .26s ease-in-out infinite alternate; }
.picker-ball.is-winner { animation: pickerWin .55s cubic-bezier(.2,.9,.3,1.35); }
@keyframes pickerPulse { to { transform: scale(1.035) rotate(1.5deg); filter: saturate(1.12); } }
@keyframes pickerWin { 0% { transform: scale(.86); } 58% { transform: scale(1.12); } 100% { transform: scale(1); } }
.picker-result-list { position: relative; z-index: 1; display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; min-height: 36px; margin-top: 17px; }
.picker-result-list > span { padding: 6px 12px; border-radius: 99px; background: #fff; border: 1px solid #D9D1FF; color: #4F46E5; font-weight: 800; box-shadow: 0 3px 10px rgba(99,91,255,.1); }
.picker-result-list.is-multi {
  width: min(620px, 100%); display: grid;
  grid-template-columns: repeat(var(--winner-count, 3), minmax(94px, 1fr));
  gap: 12px; margin: 4px auto 0;
}
.picker-result-list.is-multi > span {
  min-height: 132px; padding: 15px 10px; border-radius: 18px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  background: linear-gradient(155deg, #FFFFFF, #F1EDFF); border: 2px solid #C4B5FD;
  box-shadow: 0 12px 28px rgba(99,91,255,.15);
  animation: winnerCardIn .5s cubic-bezier(.2,.9,.3,1.25) both;
}
.picker-result-list.is-multi > span:nth-child(2) { animation-delay: .1s; }
.picker-result-list.is-multi > span:nth-child(3) { animation-delay: .2s; }
.picker-result-list.is-multi > span:nth-child(4) { animation-delay: .3s; }
.picker-result-list.is-multi > span:nth-child(5) { animation-delay: .4s; }
.picker-result-list.is-multi strong { font-size: clamp(42px, 7vw, 68px); line-height: 1; color: #4F46E5; letter-spacing: -.04em; }
.picker-result-list.is-multi small { margin-top: 9px; color: var(--muted); font-size: 12px; font-weight: 600; }
.picker-stage.is-multi-result .picker-ball { display: none; }
@keyframes winnerCardIn { from { opacity: 0; transform: translateY(24px) scale(.82) rotate(-2deg); } to { opacity: 1; transform: none; } }
.picker-primary { position: relative; z-index: 1; min-width: 210px; margin-top: 20px; padding: 13px 24px; color: #fff; background: linear-gradient(135deg, #635BFF, #7C3AED); font-weight: 800; font-size: 16px; box-shadow: 0 8px 20px rgba(99,91,255,.25); }
.picker-primary:disabled { opacity: .55; cursor: wait; transform: none; }
.picker-shortcut { position: relative; z-index: 1; margin-top: 8px; color: var(--muted); font-size: 11.5px; }
.picker-game-actions { position: relative; z-index: 1; display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 22px; }
.picker-card-result { position: relative; z-index: 1; width: min(520px, 100%); min-height: 58px; margin-top: 12px; padding: 12px 16px; border-radius: 12px; border: 1px dashed #C4B5FD; background: rgba(255,255,255,.76); text-align: center; color: var(--text); }
.picker-card-result strong { color: #635BFF; }
.picker-card-result:empty { display: none; }
.picker-confetti { position: absolute; inset: 0; z-index: 10; pointer-events: none; overflow: hidden; }
.picker-confetti i { position: absolute; top: -18px; width: 9px; height: 15px; border-radius: 2px; animation: confettiFall 1.35s ease-in forwards; }
@keyframes confettiFall { to { transform: translate3d(var(--drift), 680px, 0) rotate(720deg); opacity: .15; } }

[data-theme="dark"] .classroom-launch { background: linear-gradient(135deg, rgba(99,91,255,.18), #18181B 58%, rgba(244,124,60,.12)); border-color: #3F3F46; }
[data-theme="dark"] .classroom-launch-tags span, [data-theme="dark"] .picker-card-result { background: rgba(39,39,42,.85); }
[data-theme="dark"] .classroom-picker-dialog, [data-theme="dark"] .picker-stage { background: #0F0F12; }
[data-theme="dark"] .picker-shell:fullscreen { background: #0F0F12; }
[data-theme="dark"] .picker-head { background: rgba(24,24,27,.96); }
[data-theme="dark"] .picker-stage { background: radial-gradient(circle at 50% 35%, #27272A 0%, #18181B 58%, #0F0F12 100%); }
[data-theme="dark"] .picker-result-list span { background: #27272A; }
[data-theme="dark"] .picker-result-list.is-multi > span { background: linear-gradient(155deg, #27272A, #18181B); border-color: #6D5DD3; }

@media (max-width: 760px) {
  .classroom-launch { grid-template-columns: 1fr; padding: 20px; }
  .classroom-open-btn { width: 100%; }
  .picker-body { grid-template-columns: 1fr; }
  .picker-settings { border-right: 0; border-bottom: 1px solid var(--line); }
  .picker-stage { min-height: 530px; padding: 26px 16px 34px; }
  .picker-ball { width: 190px; }
  .picker-result-list.is-multi { grid-template-columns: repeat(2, minmax(104px, 1fr)); max-width: 330px; }
  .picker-result-list.is-multi > span { min-height: 106px; border-radius: 14px; }
  .picker-result-list.is-multi strong { font-size: 42px; }
}
@media (max-width: 430px) {
  .classroom-launch-copy { gap: 11px; }
  .classroom-launch-icon { width: 44px; height: 44px; flex-basis: 44px; font-size: 22px; }
  .classroom-launch h2 { font-size: 18px; }
  .picker-head { padding: 10px 12px; }
  .picker-head-title small { display: none; }
  .picker-settings { padding: 16px; }
  .picker-primary { width: 100%; }
  .picker-result-list.is-multi { gap: 8px; }
  .picker-result-list.is-multi > span { min-height: 94px; padding: 10px 7px; }
  .picker-result-list.is-multi strong { font-size: 36px; }
}

@media (prefers-reduced-motion: reduce) {
  .picker-ball, .picker-confetti i { animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
  .classroom-open-btn, .picker-primary { transition: none; }
}