.practice-shell {
          width: min(980px, calc(100% - 32px));
          min-height: 100dvh;
      margin: 0 auto;
      padding: 22px 0 calc(var(--answer-dock-space, 220px) + env(safe-area-inset-bottom, 0px));
    }

    .practice-head {
      position: relative;
      z-index: 100;
      display: grid;
      grid-template-columns: auto 1fr auto;
      align-items: center;
      gap: 16px;
      padding: 0 0 18px;
      border-bottom: 1px solid var(--paper-line);
    }

    .practice-title {
      min-width: 0;
    }

    .practice-title strong {
      display: block;
      font-family: var(--font-cn);
      font-size: 18px;
      letter-spacing: 1px;
    }

    .practice-title span {
      display: block;
      margin-top: 3px;
      color: var(--muted);
      font-size: 13px;
    }

    .timer-badge {
      color: var(--ink-soft);
      font-family: var(--font-serif);
      font-size: 15px;
      font-weight: 600;
      letter-spacing: 1px;
    }

    .seg-progress {
      display: grid;
      grid-auto-flow: column;
      grid-auto-columns: 1fr;
      gap: 5px;
      margin-top: 18px;
      min-height: 4px;
    }

    .seg {
      height: 4px;
      border-radius: 2px;
      background: var(--paper-line);
    }

    .seg.done {
      background: var(--red);
    }

    .seg.current {
      background: rgba(226, 72, 61, .48);
    }

    .practice-grid {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 30px;
      padding-top: 38px;
    }

    .source-panel {
      width: min(900px, 100%);
      text-align: center;
    }

    .source-label,
    .input-label,
    .hint-label {
      color: var(--faint);
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 2.5px;
      text-transform: uppercase;
    }

    .source-text {
      margin: 14px 0 0;
      color: var(--ink);
      font-family: var(--font-en);
      font-size: clamp(22px, 3.2vw, 36px);
      line-height: 1.42;
      letter-spacing: 0;
      text-align: center;
      transition: filter .18s var(--ease), opacity .18s var(--ease);
    }

    .source-text.is-blurred {
      filter: blur(8px);
      opacity: .58;
      pointer-events: none;
      text-shadow: 0 0 16px rgba(29, 28, 24, .72);
      user-select: none;
    }

    .source-word {
      display: inline;
      margin: 0;
      padding: 0 .06em;
      border: 0;
      border-radius: 5px;
      color: inherit;
      background: transparent;
      font: inherit;
      letter-spacing: inherit;
      line-height: inherit;
      cursor: pointer;
      user-select: text;
      transition: background .16s var(--ease), color .16s var(--ease);
    }

    .source-word:hover,
    .source-word.active {
      color: var(--ink);
      background: rgba(255, 235, 92, .42);
    }

    .source-panel.zh-source .source-text {
      font-family: var(--font-cn);
      font-size: clamp(21px, 2.9vw, 34px);
      line-height: 1.58;
    }

    .source-audio-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      margin: 18px auto 0;
      min-width: 132px;
      height: 42px;
      padding: 0 18px;
      border: 1px solid var(--paper-line-strong);
      border-radius: 8px;
      color: var(--ink);
      background: rgba(247, 243, 233, .74);
      font-family: var(--font-cn);
      font-size: 15px;
      font-weight: 700;
      cursor: pointer;
      transition: border-color .18s var(--ease), color .18s var(--ease), background .18s var(--ease);
    }

    .source-audio-btn:hover {
      border-color: rgba(226, 72, 61, .58);
      color: var(--red);
      background: rgba(255, 255, 255, .68);
    }

    .source-audio-btn[disabled] {
      cursor: wait;
      color: var(--muted);
      border-color: var(--paper-line);
      background: rgba(247, 243, 233, .45);
    }

    .source-audio-btn.is-playing {
      color: var(--red);
      border-color: rgba(226, 72, 61, .58);
      background: rgba(226, 72, 61, .08);
    }

    .source-audio-icon {
      width: 16px;
      font-size: 13px;
      line-height: 1;
      text-align: center;
    }

    .source-visibility-btn {
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 12px auto 0;
      width: 28px;
      height: 28px;
      padding: 0;
      border: 0;
      border-radius: 0;
      color: var(--muted);
      background: transparent;
      cursor: pointer;
      transition: color .18s var(--ease), opacity .18s var(--ease);
    }

    .source-visibility-btn:hover {
      color: var(--ink);
      background: transparent;
    }

    .source-visibility-btn.is-hidden {
      color: var(--muted);
      background: transparent;
    }

    .source-visibility-btn svg {
      width: 18px;
      height: 18px;
      fill: none;
      stroke: currentColor;
      stroke-width: 2;
      stroke-linecap: round;
      stroke-linejoin: round;
    }

    .source-visibility-btn .eye-closed,
    .source-visibility-btn.is-hidden .eye-open {
      display: none;
    }

    .source-visibility-btn.is-hidden .eye-closed {
      display: block;
    }

    .hint-card {
      display: none;
      margin-top: 24px;
      padding: 16px 18px;
      border: 1px solid rgba(201, 154, 56, .35);
      background: rgba(255, 248, 224, .64);
      color: #6E5122;
      border-radius: 8px;
      animation: slip-down .2s var(--ease) both;
    }

    .hint-card.open {
      display: block;
    }

    @keyframes slip-down {
      from { opacity: 0; transform: translateY(-8px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .hint-head {
      display: flex;
      justify-content: space-between;
      gap: 14px;
      margin-bottom: 8px;
    }

    .hint-count {
      color: var(--amber);
      font-size: 12px;
      font-weight: 700;
    }

	    .hint-text {
	      margin: 0;
	      font-size: 16px;
	      line-height: 1.72;
	    }

	    .practice-skip-btn {
	      position: fixed;
	      left: 50%;
	      bottom: calc(var(--answer-dock-space, 220px) + var(--keyboard-offset, 0px) + env(safe-area-inset-bottom, 0px) - 20px);
	      z-index: 41;
	      display: none;
	      padding: 7px 14px;
	      border: 0;
	      border-radius: 0;
	      color: rgba(115, 112, 108, .62);
	      background: transparent;
	      font-family: var(--font-cn);
	      font-size: 14px;
	      font-weight: 700;
	      line-height: 1.2;
	      cursor: pointer;
	      transform: translateX(-50%);
	      -webkit-tap-highlight-color: transparent;
	      touch-action: manipulation;
	      transition: color .16s var(--ease), opacity .16s var(--ease);
	    }

	    .practice-skip-btn:hover {
	      color: rgba(35, 32, 27, .72);
	    }

	    .practice-skip-btn:disabled {
	      color: rgba(115, 112, 108, .36);
	      cursor: not-allowed;
	    }

	    .word-popover {
	      position: fixed;
	      z-index: 90;
      width: min(420px, calc(100vw - 28px));
      padding: 22px 24px 24px;
      border: 2px solid rgba(35, 32, 27, .1);
      border-radius: 18px;
      color: #5F5D5B;
      background: rgba(255, 255, 252, .98);
      box-shadow: 0 18px 42px rgba(52, 43, 31, .18);
      text-align: left;
      animation: word-pop .18s var(--ease) both;
    }

    .word-popover[hidden] {
      display: none;
    }

    @keyframes word-pop {
      from { opacity: 0; transform: translateY(8px) scale(.98); }
      to { opacity: 1; transform: translateY(0) scale(1); }
    }

    .word-popover-head {
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 14px 18px;
    }

    .word-popover-title {
      margin: 0;
      color: #E85B14;
      font-family: var(--font-serif);
      font-size: 30px;
      font-weight: 700;
      line-height: 1.05;
    }

    .word-phonetic {
      margin-top: 6px;
      color: #7D7A76;
      font-family: var(--font-serif);
      font-size: 18px;
      line-height: 1.2;
    }

    .word-sound-actions {
      display: flex;
      flex-wrap: wrap;
      justify-content: flex-end;
      gap: 8px;
      max-width: 100%;
    }

    .word-sound-btn {
      min-width: 56px;
      height: 42px;
      padding: 0 10px;
      border: 2px solid rgba(35, 32, 27, .14);
      border-radius: 8px;
      color: #73706C;
      background: #F9F9F6;
      font-family: var(--font-cn);
      font-size: 14px;
      font-weight: 700;
      cursor: pointer;
      transition: border-color .16s var(--ease), color .16s var(--ease), background .16s var(--ease);
    }

    .word-sound-btn:hover,
    .word-sound-btn.is-playing {
      border-color: rgba(226, 72, 61, .45);
      color: var(--red);
      background: rgba(226, 72, 61, .07);
    }

    .word-favorite-btn {
      min-width: 64px;
      height: 42px;
      padding: 0 12px;
      border: 2px solid rgba(35, 32, 27, .14);
      border-radius: 8px;
      color: #73706C;
      background: #F9F9F6;
      font-family: var(--font-cn);
      font-size: 14px;
      font-weight: 700;
      cursor: pointer;
      white-space: nowrap;
      transition: border-color .16s var(--ease), color .16s var(--ease), background .16s var(--ease);
    }

    .word-favorite-btn:hover,
    .word-favorite-btn.is-saved {
      border-color: rgba(226, 72, 61, .45);
      color: var(--red);
      background: rgba(226, 72, 61, .07);
    }

    .word-definitions {
      display: grid;
      gap: 8px;
      margin: 24px 0 0;
      padding: 0;
      list-style: none;
      font-family: var(--font-cn);
      font-size: 18px;
      line-height: 1.42;
    }

    .word-definitions li {
      display: grid;
      grid-template-columns: 48px 1fr;
      gap: 10px;
      align-items: baseline;
    }

    .word-pos {
      color: #6B6864;
      font-family: var(--font-serif);
    }

    .word-translation {
      color: #666360;
    }