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var(--neutral-100);--cream-light: var(--neutral-50);--tortoise-amber: var(--vermillion-300);--tortoise-orange: var(--vermillion-500);--bg-primary: var(--neutral-50);--bg-secondary: #FFFFFF;--bg-tertiary: var(--neutral-100);--bg-card: #FFFFFF;--bg-input: var(--neutral-100);--bg-hover: var(--neutral-200);--card-bg: var(--bg-card);--card-bg-hover: var(--bg-hover);--input-bg: var(--bg-input);--text-primary: var(--neutral-800);--text-secondary: var(--neutral-500);--text-muted: var(--neutral-400);--text-light: #FFFFFF;--accent: var(--jade-500);--accent-dim: rgba(0, 149, 107, .1);--accent-hover: var(--jade-600);--accent-active: var(--jade-700);--accent-text: #FFFFFF;--secondary: var(--jade-700);--secondary-hover: var(--jade-600);--secondary-active: var(--jade-800);--correct: var(--jade-500);--correct-light: var(--jade-50);--correct-dim: rgba(0, 149, 107, .1);--incorrect: var(--error-500);--incorrect-light: var(--error-50);--incorrect-dim: rgba(220, 38, 38, .1);--warning: var(--warning-500);--warning-light: var(--warning-50);--bronze: #CD7F32;--silver: #C0C0C0;--gold: #FFD700;--border-radius: 6px;--border-radius-lg: 8px;--border-radius-xl: 10px;--border-radius-sm: 4px;--border-radius-xs: 3px;--transition: .12s ease;--transition-bounce: .2s ease;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 2px 4px rgba(0, 0, 0, .06);--shadow-lg: 0 4px 8px rgba(0, 0, 0, .06);--shadow-xl: 0 6px 12px rgba(0, 0, 0, .08);--border-light: var(--neutral-200);--border-medium: var(--neutral-300)}*,*:before,*:after{box-sizing:border-box}html,body,#root{min-height:100%;height:100dvh;overflow:hidden}body{font-family:Nunito,SimSun,CJK 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var(--border-light);font-weight:500;font-size:.85rem}.struggle-char{font-size:1.4rem;font-family:SimSun,serif;color:var(--text-primary);min-width:36px;background:var(--cream);width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:var(--border-radius);border:1px solid var(--border-light)}.struggle-char.phonetic{color:var(--mingdao-green-dark);background:var(--mingdao-green-dim);border-color:var(--mingdao-green)}.struggle-name{font-weight:600;color:var(--text-primary);min-width:60px}.struggle-meaning{flex:1;color:var(--text-secondary);font-size:.8rem}.struggle-accuracy{font-weight:700;color:var(--incorrect);min-width:40px;text-align:right}.struggle-count{font-size:.72rem;color:var(--text-muted);min-width:60px;text-align:right;font-weight:500}.mastered-grid{display:flex;flex-wrap:wrap;gap:6px}.mastered-char{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:var(--correct-light);border:1px solid 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var(--mingdao-green-dim)}.lookup-search-input::placeholder{color:var(--text-muted)}.lookup-empty-state{text-align:center;padding:32px 14px;color:var(--text-secondary);background:var(--card-bg);border-radius:var(--border-radius-lg);border:1px solid var(--border-light);font-weight:500;font-size:.9rem}.lookup-empty-icon{font-size:2.5rem;margin-bottom:10px;opacity:.4}.lookup-results-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:8px}.lookup-result-card{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:128px;padding:14px 8px;background:var(--card-bg);border:1px solid var(--border-light);border-radius:var(--border-radius-lg);cursor:pointer;transition:var(--transition);text-align:center}.lookup-result-card:hover{background:var(--cream);border-color:var(--mingdao-green)}.lookup-result-char{font-size:2.2rem;font-family:SimSun,serif;color:var(--text-primary);margin-bottom:6px;background:var(--cream);width:52px;height:52px;display:flex;align-items:center;justify-content:center;border-radius:var(--border-radius);border:1px solid var(--border-light)}.lookup-result-pinyin{font-size:.82rem;color:var(--mingdao-green-dark);margin-bottom:2px;font-weight:600}.lookup-result-meaning{font-size:.75rem;color:var(--text-secondary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%;font-weight:500}.lookup-detail-split{display:grid;grid-template-columns:minmax(320px,.95fr) minmax(360px,1.05fr);width:100%;min-height:calc(100vh - 24px);border:1px solid 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48px)}.lookup-detail-split__left{position:relative;display:flex;flex-direction:column;gap:24px;padding:36px 32px 32px;background:radial-gradient(circle at top left,rgba(224,124,76,.08),transparent 32%),linear-gradient(180deg,var(--cream-light) 0%,var(--cream) 100%)}.lookup-detail-split__back{position:absolute;top:18px;left:20px;display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border:1px solid var(--border-light);border-radius:999px;background:#ffffffb3;color:var(--text-secondary);font-size:.76rem;font-weight:600;cursor:pointer;transition:var(--transition)}.lookup-detail-split__back:hover{background:#fff;border-color:var(--mingdao-green-dark);color:var(--text-primary)}.lookup-detail-split__hero{display:flex;flex-direction:column;align-items:flex-start;gap:10px;padding-top:46px}.lookup-detail-split__characters{margin:0;font-size:clamp(4.8rem,14vw,8rem);line-height:.95;letter-spacing:.04em;color:var(--text-primary)}.lookup-detail-split__hero-meta{display:flex;align-items:center;gap:12px}.lookup-detail-split__left-meta{display:flex;flex-wrap:wrap;gap:8px}.lookup-detail-split__meta-pill{padding:4px 10px;border-radius:999px;background:#ffffffd9;border:1px solid var(--border-light);font-size:.68rem;font-weight:700;color:var(--warm-brown-dark);text-transform:uppercase;letter-spacing:.08em}.lookup-detail-split__right{display:flex;flex-direction:column;gap:24px;padding:36px 32px 32px;background:radial-gradient(circle at top right,rgba(92,186,166,.08),transparent 28%),var(--bg-secondary);overflow-y:auto}.lookup-detail-split__pinyin{color:var(--mingdao-green-dark);font-size:1.7rem;font-weight:700;letter-spacing:.04em}.lookup-detail-split__audio-btn,.lookup-detail-split__example-audio-btn{width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;border:1px solid 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var(--border-light);border-radius:16px;background:#fff;box-shadow:var(--shadow-sm)}.lookup-detail-split__example-card{padding:16px}.lookup-detail-split__example-header,.lookup-detail-split__status-header{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.lookup-detail-split__example-english,.lookup-detail-split__example-chinese,.lookup-detail-split__example-pinyin{margin:0}.lookup-detail-split__example-english{color:var(--text-primary);font-size:.98rem;font-weight:600;line-height:1.5}.lookup-detail-split__example-chinese{margin-top:12px;font-size:1.5rem;line-height:1.45}.lookup-detail-split__example-pinyin{margin-top:8px;color:var(--mingdao-green-dark);font-size:.88rem;line-height:1.45}.lookup-detail-split__status-card{display:flex;flex-direction:column;gap:12px;padding:18px}.lookup-detail-split__status-pill{display:inline-flex;align-items:center;justify-content:center;padding:6px 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var(--border-light);border-radius:999px;background:#fffc;font-size:.86rem}.lookup-detail-split__prim-char{font-weight:600;font-size:1rem}.lookup-detail-split__vocab-item{display:flex;align-items:center;gap:16px;padding:14px 16px;flex-wrap:wrap}.lookup-detail-split__vocab-char{font-size:1.5rem;font-weight:700;color:var(--mingdao-green-dark)}.lookup-detail-split__vocab-pinyin{display:block;color:var(--mingdao-green-dark);font-size:.85rem;font-weight:700}.lookup-detail-split__vocab-meaning{display:block;color:var(--text-secondary);font-size:.88rem}.lookup-detail-split__stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.lookup-detail-split__stat{text-align:center;padding:12px 8px;background:var(--cream-light);border-radius:12px;border:1px solid var(--border-light)}.lookup-detail-split__stat-value{display:block;font-size:1.12rem;font-weight:700;color:var(--mingdao-green-dark);margin-bottom:2px}.lookup-detail-split__stat-label{display:block;font-size:.64rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;font-weight:700}@media(max-width:960px){.lookup-detail-modal__content,.lookup-detail-modal .lookup-detail-split{max-height:calc(100vh - 48px)}.lookup-detail-modal .lookup-detail-split{min-height:auto}.lookup-detail-split{grid-template-columns:1fr;min-height:auto}.lookup-detail-split__left{padding:28px 24px 24px}.lookup-detail-split__right{padding:24px}}@media(max-width:768px){.lookup-detail-split{border-radius:12px}.lookup-detail-split__characters{font-size:clamp(3.5rem,20vw,6rem)}.lookup-detail-split__hero{padding-top:44px}.lookup-detail-split__component-grid{grid-template-columns:1fr 1fr}.lookup-detail-split__stats{grid-template-columns:repeat(2,1fr)}}@media(max-width:640px){.lookup-detail-split__left,.lookup-detail-split__right{padding:20px 16px 16px}.lookup-detail-split__back{position:static;min-height:44px;margin:0 0 8px}.lookup-detail-split__hero{padding-top:0}.lookup-detail-split__hero-meta,.lookup-detail-split__section-header,.lookup-detail-split__breakdown-header,.lookup-detail-split__example-header,.lookup-detail-split__status-header{flex-direction:column;align-items:flex-start}}@media(max-width:480px){.lookup-results-grid{grid-template-columns:repeat(2,1fr)}.lookup-detail-modal{padding:12px}.lookup-detail-modal__content,.lookup-detail-modal .lookup-detail-split{max-height:calc(100vh - 24px)}.lookup-detail-modal__close{top:14px;right:14px}.lookup-detail-split__left,.lookup-detail-split__right{padding:22px 18px 18px}.lookup-detail-split__component-grid,.lookup-detail-split__stats{grid-template-columns:1fr}.lookup-detail-split__example-chinese{font-size:1.28rem}}@media(max-width:430px){.lookup-search-container{margin-bottom:12px}.lookup-result-card{min-height:116px;padding:12px 6px}.lookup-detail-split__characters{font-size:clamp(3rem,21vw,4.5rem)}.lookup-detail-split__left,.lookup-detail-split__right{padding:18px 14px 14px}}#sentence-scramble-exercise.exercise-view.single-column{max-width:600px;margin:0 auto}#sentence-scramble-exercise .exercise-sidebar{display:flex;flex-direction:column;gap:24px}#sentence-scramble-exercise .sidebar-header{display:flex;justify-content:space-between;align-items:center;padding:0}#sentence-scramble-exercise .pack-name-badge{position:static;color:var(--warm-brown);font-size:.8rem;font-weight:800;letter-spacing:.04em;text-transform:uppercase;background:var(--cream);border:1px solid var(--border-light);border-radius:var(--border-radius-xl);padding:6px 14px}#sentence-scramble-exercise .progress-indicator{color:var(--mingdao-green-dark);font-size:.9rem;font-weight:700;background:var(--mingdao-green-dim);padding:4px 12px;border-radius:var(--border-radius);border:1px solid var(--mingdao-green)}.answer-area{padding:0}.answer-area h3{font-size:.75rem;font-weight:800;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.08em;margin-bottom:16px}.answer-area .answer-chips{min-height:84px;background:var(--input-bg);border-radius:var(--border-radius-sm);padding:16px;border:1px solid var(--border-light)}.answer-area .placeholder-text{color:var(--text-muted);font-size:.95rem;font-style:italic}.segments-pool{padding:0}.segments-pool h3{font-size:.75rem;font-weight:800;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.08em;margin-bottom:16px}.segment-chips{display:flex;flex-wrap:wrap;gap:12px;align-items:center}.segment-chip{font-family:SimSun,serif;font-size:1.75rem;line-height:1.2;padding:12px 24px;border:none;border-radius:999px;cursor:pointer;transition:var(--transition);font-weight:400;white-space:nowrap}.segment-chip.available{background:var(--cream);color:var(--text-primary);box-shadow:var(--shadow-sm);border:1px solid var(--border-light)}.segment-chip.available:hover{background:var(--cream-light);transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--mingdao-green)}.segment-chip.available:active{transform:translateY(0);box-shadow:var(--shadow-sm)}.segment-chip.selected{background:var(--mingdao-green);color:#fff;box-shadow:none;border:1px solid var(--mingdao-green-dark)}.segment-chip.selected:hover{background:var(--mingdao-green-light);transform:translateY(-2px);box-shadow:none}.segment-chip.selected:active{transform:translateY(1px);box-shadow:none}.action-buttons{display:flex;gap:12px}.action-buttons .reset-btn{flex:1;background:var(--input-bg);border:1px solid 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4px;min-height:unset;background:var(--bg-secondary)}.flashcard-card__primitive-char{font-size:1.4rem}.flashcard-card__primitive-meaning{font-size:.65rem}.flashcard-card__primitive-header{flex-wrap:wrap;align-items:flex-start}.flashcard-card__primitive-progress{white-space:normal}.flashcard-card__primitive-check-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;flex-shrink:0;border:none;border-radius:12px;background:var(--mingdao-green);color:#fff;font-size:1.1rem;font-weight:700;cursor:pointer}.flashcard-card__primitive-check-btn:active{background:var(--mingdao-green-dark);transform:scale(.95)}.flashcard-card__primitive-header{flex-wrap:nowrap}.flashcard-card__right-bottom--primitive{display:none}.flashcard-session-picker,.flashcard-metrics,.flashcard-summary{grid-template-columns:1fr}}@media(max-width:640px){.flashcard-view--config,.flashcard-view--summary{padding:10px 8px;overflow-y:auto;-webkit-overflow-scrolling:touch}.flashcard-shell{padding:14px 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