.sb-container{width:100%;max-width:700px;margin:0 auto;background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);overflow:hidden}.sb-card-body{display:flex;flex-direction:column;gap:1.5rem;padding:1.375rem 2.25rem 2.25rem}.sb-heading{display:flex;flex-direction:column;gap:.875rem}.sb-header-progress{font-size:var(--fs-micro);font-weight:var(--fw-regular);color:var(--text-faint)}.sb-header-progress strong{font-weight:inherit;color:inherit}.sb-header{display:flex;align-items:center;justify-content:space-between;gap:1rem}.sb-title{font-size:1.1rem;font-weight:700;color:var(--text-main);margin:0}.sb-topic-badge{font-size:.8rem;color:var(--text-muted);background:var(--bg-rail);border-radius:999px;padding:.25rem .75rem;border:1px solid var(--border-subtle);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:160px}.sb-reset-btn{background:none;border:1px solid var(--border-subtle);border-radius:50%;width:36px;height:36px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text-muted);flex-shrink:0;transition:background .15s,color .15s,transform .2s}.sb-reset-btn:hover{background:var(--bg-rail);color:var(--text-main);transform:rotate(-30deg)}.sb-reset-btn:active{transform:rotate(-90deg)}.sb-progress-track{height:4px;background:color-mix(in srgb,var(--wordmark) 12%,transparent);overflow:hidden}.sb-progress-fill{height:100%;background:var(--wordmark);transition:width .4s ease}.sb-drop-zone-label{font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin-bottom:.5rem}.sb-drop-zone{min-height:170px;border:1.5px solid var(--border-subtle);border-radius:var(--radius-lg, 16px);padding:.75rem;display:flex;flex-wrap:wrap;gap:.5rem;align-content:center;transition:border-color .2s,background .2s,box-shadow .2s;background:var(--bg-app)}.sb-drop-wrap{position:relative}.sb-play-pill{position:absolute;top:12px;right:12px;display:inline-flex;align-items:center;gap:.4375rem;padding:.4375rem .875rem;border:1px solid var(--border-subtle);border-radius:var(--radius-pill);background:var(--bg-card);color:var(--text-muted);font-family:var(--font-body);font-size:var(--fs-caption);font-weight:var(--fw-semibold);line-height:1;cursor:pointer;transition:color .15s ease,border-color .15s ease}.sb-play-pill:hover{color:var(--accent);border-color:var(--accent)}.sb-drop-zone-placeholder{width:100%;align-self:center;text-align:center;color:var(--text-main);font-size:1rem;font-weight:600;pointer-events:none;-webkit-user-select:none;user-select:none;padding:1.25rem .5rem}.sb-drop-zone.sb-has-chunks{border-color:var(--accent-warm);border-style:solid}.sb-drop-zone.sb-correct{border-color:var(--color-success);background:var(--color-success-bg, rgba(34, 197, 94, .08));border-style:solid}.sb-drop-zone.sb-incorrect{border-color:var(--color-error);background:#ef44440f;border-style:solid;animation:sb-shake .4s ease}@keyframes sb-shake{0%,to{transform:translate(0)}20%{transform:translate(-6px)}40%{transform:translate(6px)}60%{transform:translate(-4px)}80%{transform:translate(4px)}}.sb-chunk{display:inline-flex;align-items:center;justify-content:space-between;gap:.5rem;padding:.75rem 1.25rem .75rem 1.5rem;border-radius:999px;border:1.5px solid var(--border-subtle);background:var(--bg-card);color:var(--text-main);font-size:1.2rem;font-weight:500;cursor:pointer;transition:background .15s,border-color .15s,color .15s,transform .12s,box-shadow .12s;-webkit-user-select:none;user-select:none;white-space:nowrap;font-family:var(--font-serif-body)}.sb-chunk:hover{background:var(--bg-rail);border-color:var(--accent-warm);transform:translateY(-2px);box-shadow:0 4px 12px #00000014}.sb-chunk:active{transform:translateY(0);box-shadow:none}.sb-chunk.placed{background:var(--accent-warm);border-color:var(--accent-warm);color:#fff}.sb-chunk.placed:hover{background:var(--accent-hover);border-color:var(--accent-hover);transform:translateY(-2px)}.sb-chunk.correct{background:var(--color-success);border-color:var(--color-success);color:#fff;cursor:default;animation:sb-pop .25s ease}.sb-chunk.incorrect{background:var(--color-error);border-color:var(--color-error);color:#fff;cursor:default}@keyframes sb-pop{0%{transform:scale(.9)}60%{transform:scale(1.08)}to{transform:scale(1)}}.sb-available-label{font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin-bottom:.5rem}.sb-available-chunks{display:flex;flex-wrap:wrap;gap:.5rem;min-height:48px}.sb-feedback{display:flex;align-items:center;justify-content:center;text-align:center;font-size:1rem;font-weight:700;line-height:var(--lh-normal);min-height:1.5rem;margin-top:.25rem;transition:opacity .2s}.sb-feedback.correct{color:var(--color-success)}.sb-feedback.incorrect{color:var(--color-error)}.sb-translation-row{display:inline-flex;align-items:center;gap:.75rem;padding:.5rem 1.2rem;background:var(--bg-card);border:1.5px solid var(--border-subtle);border-radius:999px;box-shadow:0 4px 12px #00000005;font-size:1.05rem;color:var(--text-main);width:fit-content;margin:.5rem 0;align-self:flex-start;font-weight:500}.sb-translation-toggle{background:none;border:none;cursor:pointer;color:var(--text-muted);padding:0;display:flex;align-items:center;gap:.4rem;font-size:.9rem;text-decoration:none;transition:color .15s;font-weight:600}.sb-translation-toggle:hover{color:var(--accent-warm)}.sb-translation-text{transition:opacity .2s}.sb-translation-text.hidden{opacity:0;pointer-events:none;-webkit-user-select:none;user-select:none}.sb-next-btn{width:100%;padding:.85rem;font-size:1rem;font-weight:700;border-radius:var(--radius-md, 12px);background:var(--accent);color:#fff;border:none;cursor:pointer;transition:background .15s,transform .12s;animation:sb-pop .3s ease}.sb-next-btn:hover{background:var(--accent-hover);transform:translateY(-1px)}.sb-next-btn:active{transform:translateY(0)}.sb-status-bar{display:flex;justify-content:space-between;border-top:1px solid var(--border-subtle);padding-top:.75rem;font-size:.8rem;color:var(--text-muted)}.sb-status-bar strong{color:var(--text-main)}.sb-summary{text-align:center;display:flex;flex-direction:column;align-items:center;gap:1.25rem;padding:2rem 1rem}.sb-summary-score{font-size:3.5rem;font-weight:800;color:var(--accent-warm);line-height:1}.sb-summary-label{font-size:1rem;color:var(--text-muted)}.sb-summary-title{font-size:1.5rem;font-weight:700;color:var(--text-main)}.sb-summary-actions{display:flex;flex-direction:column;gap:.75rem;width:100%;max-width:320px}#sbTtsSpeedMount{width:min(220px,80vw);margin-top:0}#sbTtsSpeedMount .tts-speed-control{margin:0}#sbTtsSpeedMount .tts-speed-row{justify-content:center}.sb-chunk-audio-btn{display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px;border-radius:50%;color:currentColor;opacity:.45;transition:opacity .15s,background-color .15s,transform .1s;cursor:pointer;flex-shrink:0}.sb-chunk-audio-btn:hover{opacity:.95;background-color:#00000014;transform:scale(1.1)}.sb-chunk.placed .sb-chunk-audio-btn:hover,.sb-chunk.correct .sb-chunk-audio-btn:hover,.sb-chunk.incorrect .sb-chunk-audio-btn:hover{background-color:#ffffff2e}.sb-sentence-audio-btn:hover{color:var(--accent-warm)!important;background-color:var(--bg-rail)!important;transform:scale(1.05)}.sb-sentence-audio-btn:active{transform:scale(.95)}.sb-copy-btn:hover{background-color:var(--bg-rail)!important;color:var(--text-main)!important;border-color:var(--accent-warm)!important}.sb-copy-btn:active{transform:scale(.95)}#sbTranscriptBody::-webkit-scrollbar{width:6px}#sbTranscriptBody::-webkit-scrollbar-track{background:transparent}#sbTranscriptBody::-webkit-scrollbar-thumb{background:var(--border-subtle);border-radius:3px}#sbTranscriptBody::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.sb-available-container{position:relative}.sb-available-chunks.sb-blur{filter:blur(10px);pointer-events:none;-webkit-user-select:none;user-select:none}.sb-blur-overlay{position:absolute;inset:0;background:#ffffff73;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.75rem;box-sizing:border-box;padding:1rem;border-radius:12px;z-index:10;cursor:pointer;border:1.5px dashed var(--border-subtle);transition:opacity .25s ease,visibility .25s;animation:fadeIn .2s ease-out}@media(max-width:768px){.sb-available-container.sb-listen-first-active{min-height:250px}.sb-blur-overlay{padding:1.25rem .75rem}}.sb-blur-reveal-btn{background:var(--accent-warm);color:#fff;border:none;border-radius:999px;padding:.65rem 1.5rem;font-weight:600;font-size:.95rem;cursor:pointer;box-shadow:0 4px 15px color-mix(in srgb,var(--accent) 20%,transparent);transition:transform .15s,background-color .15s;display:flex;align-items:center;gap:.5rem}.sb-blur-reveal-btn:hover{transform:scale(1.05);background:var(--accent-hover)}.sb-chunk .interactive-word{color:inherit!important;font-weight:inherit;border-radius:0;padding:0;cursor:pointer;transition:background-color .15s}.sb-chunk .interactive-word:hover{background-color:#00000014;border-radius:2px}.sb-chunk.placed .interactive-word:hover,.sb-chunk.correct .interactive-word:hover,.sb-chunk.incorrect .interactive-word:hover{background-color:#fff3}.sb-chunk-remove-btn{display:inline-flex;align-items:center;justify-content:center;width:18px;height:18px;border-radius:50%;background:#ffffff26;color:#fff;cursor:pointer;transition:background-color .15s;margin-left:.5rem}.sb-chunk-remove-btn:hover{background:#ffffff59}.review-container:has(.sb-container--stage){max-width:none}.sb-container--stage{--sb-gutter: 3.5rem;--sb-ink: color-mix(in srgb, var(--text-main) 82%, var(--bg-app));max-width:none;margin:0;background:transparent;border:none;border-radius:0;box-shadow:none;overflow:visible;min-height:min(900px,calc(100vh - 8rem));display:flex;flex-direction:column}.sb-sessionbar{flex:none;display:flex;align-items:center;gap:1.25rem;padding:1.75rem var(--sb-gutter) 0}.sb-container--stage .sb-header-progress{flex:none;min-width:84px;font-size:var(--fs-body-sm);font-weight:var(--fw-regular);color:var(--text-faint)}.sb-container--stage .sb-progress-track{flex:1;min-width:0;height:6px;border-radius:var(--radius-pill);background:color-mix(in srgb,var(--wordmark) 14%,transparent)}.sb-container--stage .sb-progress-fill{border-radius:var(--radius-pill)}.sb-bar-btn{flex:none;display:inline-flex;align-items:center;justify-content:center;height:34px;padding:0 .5rem;border:1px solid color-mix(in srgb,var(--text-faint) 30%,transparent);border-radius:var(--radius-pill);background:transparent;color:var(--text-muted);font-family:var(--font-body);font-size:var(--fs-micro);font-weight:var(--fw-semibold);cursor:pointer;transition:color .15s ease,border-color .15s ease}.sb-bar-btn--text{padding:0 .9rem}.sb-bar-btn--icon{width:34px;padding:0}.sb-bar-btn.is-on{color:var(--accent);border-color:var(--accent)}.sb-bar-btn:hover{color:var(--text-main);border-color:var(--text-faint)}.sb-container--stage .conv-end-session-btn{flex:none;width:34px;height:34px;padding:0;border:1px solid color-mix(in srgb,var(--text-faint) 30%,transparent);border-radius:50%;background:transparent;color:var(--text-muted);font-size:var(--fs-body-lg);font-weight:var(--fw-regular);line-height:1;box-shadow:none}.sb-container--stage .conv-end-session-btn:hover{background:transparent;color:var(--text-main);border-color:var(--text-faint)}.sb-stage{flex:1;display:flex;flex-direction:column;justify-content:center;gap:3.75rem;padding:0 var(--sb-gutter) 1.25rem}.sb-answer,.sb-container--stage .sb-available-container{width:100%;max-width:760px;margin:0 auto}.sb-prompt-row{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;margin-bottom:2.125rem}.sb-container--stage .sb-drop-zone-label{margin:0;font-size:1.25rem;font-weight:var(--fw-semibold);line-height:1.3;color:var(--sb-ink);text-transform:none;letter-spacing:normal}.sb-container--stage .sb-play-pill{position:static;padding:0;border:none;background:none;color:var(--accent);font-size:var(--fs-body-sm);font-weight:var(--fw-semibold);gap:.5rem}.sb-container--stage .sb-play-pill:hover{color:var(--accent-hover);border-color:transparent}.sb-container--stage .sb-drop-wrap{position:static}.sb-stage:has(.sb-available-container.sb-listen-first-active) .sb-play-pill{display:none}.sb-container--stage .sb-drop-zone{min-height:64px;border:none;border-radius:0;padding:0;background:transparent;display:flex;flex-wrap:wrap;gap:1.375rem;align-items:flex-end;align-content:flex-end}.sb-container--stage .sb-drop-zone.sb-has-chunks,.sb-container--stage .sb-drop-zone.sb-correct,.sb-container--stage .sb-drop-zone.sb-incorrect{border:none;background:transparent}.sb-container--stage .sb-feedback{font-size:1.375rem;margin-top:1.75rem;min-height:2rem}.sb-slot{display:inline-block;flex:none;height:2px;background:color-mix(in srgb,var(--text-main) 18%,transparent)}.sb-container--stage .sb-available-chunks{gap:.875rem;min-height:0}.sb-container--stage .sb-chunk{padding:.875rem 1.625rem;font-size:1.3125rem;font-weight:500;border-radius:var(--radius-pill);border:1.5px solid var(--border-subtle);background:var(--bg-card);color:var(--sb-ink);box-shadow:0 1px #2020200d}.sb-container--stage .sb-chunk:not(.placed):not(.correct):not(.incorrect):hover{background:var(--bg-card);border-color:var(--accent);color:var(--accent);transform:none;box-shadow:0 1px #2020200d}.sb-container--stage .sb-chunk.placed{background:var(--accent-warm);border-color:var(--accent-warm);color:#fff}.sb-container--stage .sb-chunk.placed:hover{background:var(--accent-hover);border-color:var(--accent-hover)}.sb-container--stage .sb-chunk.correct{background:var(--color-success);border-color:var(--color-success);color:#fff;cursor:default}.sb-container--stage .sb-chunk.incorrect{background:var(--color-error);border-color:var(--color-error);color:#fff;cursor:default}.sb-footer{flex:none;display:flex;align-items:center;justify-content:center;gap:1.5rem;min-height:56px;padding:0 var(--sb-gutter) 3.25rem}.sb-container--stage .sb-translation-text{display:block;margin-top:1.5rem;font-style:italic;font-size:var(--fs-body);line-height:var(--lh-normal);color:var(--text-muted)}.sb-container--stage .sb-translation-text.hidden{display:none}.sb-container--stage .sb-next-btn{width:auto;flex:none;border-radius:var(--radius-pill);padding:1rem 2.5rem;font-size:var(--fs-body-lg);font-weight:var(--fw-bold)}@media(max-width:768px){.sb-container--stage{--sb-gutter: 1.25rem;min-height:0}.sb-stage{gap:2.5rem;padding:2rem var(--sb-gutter)}.sb-container--stage .sb-chunk{font-size:1.125rem;padding:.75rem 1.25rem}.sb-footer{padding:0 var(--sb-gutter) 2rem}}