/* 场景单词：沿用乐学堂的暖白与草绿色，桌面双栏，内容保持清晰可读。 */
.words-shell { display: grid; grid-template-columns: 272px minmax(0, 1fr); gap: 24px; align-items: start; padding-top: 24px; --w-accent: var(--green); --w-soft: #edf4e5; --w-line: var(--line); }
.words-shell .sidebar { padding: 18px 14px; border: 1px solid var(--w-line); border-radius: 22px; background: var(--white); }
.words-shell .study-content { min-width: 0; }
.words-shell .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.words-shell .sidebar-label { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; padding: 0 6px; margin-bottom: 8px; font-size: 16px; font-weight: 800; }
.words-shell .nav-count { color: var(--muted); font-size: 13px; font-weight: 500; }
.words-shell .category-nav summary { padding: 4px 6px 8px; font-size: 15px; font-weight: 650; cursor: pointer; }
.words-shell .category-nav nav { display: flex; flex-direction: column; gap: 4px; padding: 4px 6px; }
.words-shell .chip { display: flex; align-items: center; gap: 9px; width: 100%; min-height: 42px; padding: 6px 10px; border: 1px solid transparent; border-radius: 10px; background: transparent; color: var(--ink); text-align: left; }
.words-shell .chip:hover { background: #f0f5e9; }
.words-shell .chip.on { background: #e6f0d9; border-color: #b8cfa2; box-shadow: inset 3px 0 0 var(--green); }
.words-shell .chip-emoji { flex-shrink: 0; font-size: 19px; line-height: 1.2; }
.words-shell .chip-name { flex: 1; font-size: 15.5px; font-weight: 650; }
.words-shell .chip-num { color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; }
.words-shell .chip-num.full { color: var(--green); font-weight: 800; }
.words-shell .sidebar-note { margin: 12px 6px 0; color: var(--muted); font-size: 13.5px; line-height: 1.8; }

.words-shell .search-box { min-width: 0; }
.words-shell .search-box input { min-height: 48px; margin-bottom: 12px; border: 1.5px solid #bacbb6; background: var(--white); border-radius: 14px; padding: 8px 10px; font-size: 16px; }
.words-shell .search-box input:focus { border-color: var(--green); }
.words-shell .tts-settings { margin-bottom: 18px; border-color: var(--w-line); background: var(--white); }
.words-shell .tts-settings legend { font-size: 18px; }
.words-shell .tts-controls-grid label, .words-shell .tts-voice-control select { font-size: 17px; }
.words-shell .tts-controls-note { font-size: 15px; }
.words-shell .tts-control-slider output { color: var(--green); }
.words-shell .tts-control-slider input[type="range"] { accent-color: var(--green); }
.words-shell .words-feedback { margin: 0 0 14px; color: var(--green); font-size: 17px; }
.words-shell .words-feedback:empty { display: none; }
.words-shell .words-feedback.error { color: #a3332a; }

.words-shell #words-cards { scroll-margin-top: 24px; }
.words-shell .unit-head { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; min-height: 80px; padding: 14px 18px; margin-bottom: 18px; border: 1px solid #e5dbb9; border-radius: 18px; background: #fff6dc; }
.words-shell .unit-emoji { display: grid; place-items: center; flex: 0 0 46px; height: 46px; font-size: 34px; line-height: 1; }
.words-shell .unit-head h1 { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px 14px; min-width: 0; margin: 0; font-size: clamp(25px, 1.8vw, 32px); line-height: 1.35; letter-spacing: -.02em; }
.words-shell .unit-cn { color: #5d6544; font-size: 21px; font-weight: 650; }
.words-shell .unit-progress { flex-shrink: 0; margin: 0 0 0 auto; color: #5d6544; font-size: 17px; white-space: nowrap; }
.words-shell .unit-progress strong { color: var(--green); font-size: 22px; }
.words-shell .search-head { margin: 0 0 18px; color: var(--muted); font-size: 19px; font-weight: 650; }

.words-shell .wgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 440px), 1fr)); align-items: stretch; gap: 20px; }
.words-shell .wcard { display: flex; flex-direction: column; min-width: 0; padding: 20px; border: 1px solid var(--w-line); border-top: 4px solid color-mix(in srgb, var(--c, #609cbd) 55%, #fffefa); border-radius: 22px; background: var(--white); box-shadow: 0 3px 0 #233e3704; }
.words-shell .wcard.learned { background: #f0f7e9; border-color: #b8d2a5; }
.words-shell .unit-tag { display: inline-block; margin-bottom: 12px; padding: 4px 10px; border-radius: 8px; background: var(--w-soft); color: var(--green-dark); font-size: 15px; }
.words-shell .wtop { display: flex; gap: 14px; align-items: center; }
.words-shell .pic { display: grid; place-items: center; flex: 0 0 64px; width: 64px; height: 64px; padding: 0; border: 1px solid color-mix(in srgb, var(--c, #609cbd) 25%, #fffefa); border-radius: 16px; background: color-mix(in srgb, var(--c, #609cbd) 10%, #fffefa); font-size: 36px; }
.words-shell .pic:hover { filter: brightness(.97); }
.words-shell .pic-fallback { color: var(--green); font-size: 25px; font-weight: 800; text-transform: uppercase; }
.words-shell .winfo { flex: 1; min-width: 0; }
.words-shell .wline { display: flex; align-items: center; gap: 8px; margin: 0; }
.words-shell .word { min-width: 0; margin: 0; font-size: 32px; font-weight: 800; line-height: 1.35; letter-spacing: 0; overflow-wrap: anywhere; }
.words-shell .say { display: grid; place-items: center; flex: 0 0 44px; width: 44px; height: 44px; padding: 0; border: 0; border-radius: 12px; background: #eff4e8; font-size: 21px; }
.words-shell .say:hover { background: #e0eccf; }
.words-shell .wmeta { display: flex; align-items: baseline; flex-wrap: wrap; gap: 2px 12px; margin-top: 3px; }
.words-shell .ipa { color: #57517d; font-size: 19px; font-weight: 650; overflow-wrap: anywhere; }
.words-shell .zh { font-size: 19px; font-weight: 600; color: #33404d; overflow-wrap: anywhere; }
.words-shell .wsec { display: flex; align-items: flex-start; gap: 10px; margin-top: 16px; }
.words-shell .seclabel { flex-shrink: 0; margin-top: 4px; padding: 3px 8px; border-radius: 8px; background: #edf3e5; color: var(--green); font-size: 16px; font-weight: 750; }
.words-shell .parts, .words-shell .rels { display: flex; align-items: flex-start; flex-wrap: wrap; gap: 8px; min-width: 0; }
.words-shell .plus { align-self: center; color: var(--muted); font-size: 16px; }
.words-shell .part, .words-shell .rel { display: inline-flex; flex-direction: column; align-items: flex-start; gap: 2px; max-width: 100%; min-height: 48px; padding: 8px 11px; border: 1px solid #d9e1cf; border-radius: 11px; background: #f9fbf5; color: var(--ink); overflow-wrap: anywhere; text-align: left; }
.words-shell .part:hover, .words-shell .rel:hover { border-color: #a8c28c; background: #eff5e5; }
.words-shell .part b, .words-shell .rel b { font-size: 20px; font-weight: 800; }
.words-shell .part i, .words-shell .rel i { font-style: normal; font-size: 16px; color: #465765; }
.words-shell .rel .rel-ipa { color: #57517d; font-size: 14px; font-weight: 650; }
.words-shell .memo { margin: 16px 0 0; padding: 12px 14px; border: 1px solid #f0e4c3; border-radius: 12px; background: #fff8e8; color: #655638; font-size: 17px; line-height: 1.85; }
.words-shell .wcard-footer { display: flex; justify-content: flex-end; margin-top: auto; padding-top: 16px; }
.words-shell .learn-btn { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 6px 13px; border: 1px solid #bacdb0; border-radius: 11px; background: white; color: var(--green); font-size: 16px; font-weight: 650; }
.words-shell .learn-btn span { font-size: 20px; }
.words-shell .learn-btn:hover, .words-shell .learn-btn.on { border-color: var(--green); background: #e5f0da; }
.words-shell .empty { padding: 30px; border: 2px dashed var(--w-line); border-radius: 18px; color: var(--muted); font-size: 18px; text-align: center; }

@media (min-width: 1800px) { .words-shell .wgrid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 1050px) and (min-width: 900px) {
  .words-shell { grid-template-columns: 240px minmax(0, 1fr); gap: 18px; }
  .words-shell .chip { padding-inline: 8px; }
  .words-shell .unit-head { flex-wrap: wrap; }
  .words-shell .unit-progress { margin-left: 62px; }
}
@media (max-width: 759px) {
  .words-shell { grid-template-columns: minmax(0, 1fr); gap: 18px; padding-top: 18px; }
  .words-shell .sidebar { position: static; padding: 14px; }
  .words-shell .category-nav nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .words-shell .chip { height: 100%; }
  .words-shell .sidebar-note { margin-top: 8px; }
  .words-shell .unit-head { flex-wrap: wrap; gap: 10px 12px; padding: 12px 14px; }
  .words-shell .unit-head h1 { flex: 1; font-size: 25px; }
  .words-shell .unit-cn { font-size: 19px; }
  .words-shell .unit-progress { flex-basis: calc(100% - 58px); margin-left: 58px; font-size: 16px; }
}
@media (max-width: 480px) {
  .words-shell .chip { gap: 7px; padding: 8px; }
  .words-shell .chip-name { font-size: 17px; }
  .words-shell .chip-num { font-size: 14px; }
  .words-shell .wcard { padding: 16px; }
  .words-shell .pic { flex-basis: 54px; width: 54px; height: 54px; font-size: 30px; }
  .words-shell .wtop { gap: 10px; }
  .words-shell .word { font-size: 28px; }
  .words-shell .wmeta { gap: 2px 8px; }
  .words-shell .ipa { font-size: 18px; }
  .words-shell .say { flex-basis: 40px; width: 40px; height: 44px; }
}
@media (prefers-reduced-motion: reduce) {
  .words-shell button { transition: none; }
  .words-shell .wcard.learned-flash { animation: none; }
}
@media print {
  .words-shell .sidebar, .words-shell .learn-btn, .words-shell .say { display: none !important; }
  .words-shell { display: block; }
  .words-shell .wcard { break-inside: avoid; box-shadow: none; }
  .words-shell .wgrid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* 深链高亮：从词以类聚跳转过来时目标词卡闪一下。 */
@keyframes wordFlash { 0% { box-shadow: 0 0 0 0 rgba(47, 125, 79, .5); } 60% { box-shadow: 0 0 0 10px rgba(47, 125, 79, 0); } 100% { box-shadow: 0 0 0 0 rgba(47, 125, 79, 0); } }
.words-shell .wcard.learned-flash { animation: wordFlash 1.6s ease; }