.app-main{padding-bottom:var(--nav-height);min-height:100dvh}.app-nav{position:fixed;bottom:0;left:0;right:0;height:var(--nav-height);display:flex;background:var(--color-bg);border-top:1px solid var(--color-border);z-index:100;padding-bottom:env(safe-area-inset-bottom)}.app-nav__item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;font-size:.6rem;letter-spacing:.02em;color:var(--color-text-muted);text-decoration:none;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;transition:color .15s}.app-nav__item.active{color:var(--color-accent)}.app-nav__item.locked{opacity:.35;pointer-events:none}.app-nav__icon{font-size:1.35rem;line-height:1}.app-nav__lang{display:flex;align-items:center;justify-content:center;padding:0 10px;font-size:.65rem;font-weight:700;letter-spacing:.05em;color:var(--color-text-muted);background:none;border:none;cursor:pointer;-webkit-tap-highlight-color:transparent;transition:color .15s}.app-nav__lang:hover{color:var(--color-accent)}.page{padding:var(--page-padding);max-width:600px;margin:0 auto}.page__header{display:flex;align-items:center;justify-content:space-between;padding:16px 0 12px}.page__title{margin:0;font-size:1.3rem;font-weight:700}.page__subtitle{margin:0;font-size:.85rem;color:var(--color-text-muted)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 18px;border:none;border-radius:var(--radius);font-size:.95rem;font-weight:600;transition:opacity .15s}.btn:disabled{opacity:.4;cursor:not-allowed}.btn--primary{background:var(--color-accent);color:#fff}.btn--ghost{background:none;color:var(--color-text-muted);padding:10px 12px}.btn--icon{width:44px;height:44px;padding:0;border-radius:50%;font-size:1.4rem;background:var(--color-accent);color:#fff;border:none}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;padding:60px 24px;text-align:center}.empty-state__icon{font-size:3rem;line-height:1}.empty-state__title{margin:0;font-size:1.1rem;font-weight:600}.empty-state__body{margin:0;font-size:.9rem;color:var(--color-text-muted);max-width:260px}.word-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:1px}.word-card{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:12px;padding:12px 4px;border-bottom:1px solid var(--color-border)}.word-card__char{font-size:2rem;line-height:1;min-width:2.2rem;text-align:center}.word-card__info{min-width:0}.word-card__pinyin{font-size:.8rem;color:var(--color-text-muted);margin:0 0 2px}.word-card__meaning{font-size:.9rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin:0}.word-card__level{display:flex;flex-direction:column;align-items:center;gap:3px;min-width:36px}.word-card__level-num{font-size:.75rem;font-weight:600;color:var(--color-text-muted)}.level-bar{width:36px;height:4px;background:var(--color-border);border-radius:2px;overflow:hidden}.level-bar__fill{height:100%;background:var(--color-success);border-radius:2px;transition:width .3s}.add-words-dialog{border:none;border-radius:var(--radius) var(--radius) 0 0;padding:0;margin:auto auto 0;width:100%;max-width:600px;max-height:90dvh;overflow:hidden}.add-words-dialog__inner{display:flex;flex-direction:column;max-height:90dvh;overflow:hidden}.add-words-dialog__header{display:flex;align-items:center;justify-content:space-between;padding:16px var(--page-padding);border-bottom:1px solid var(--color-border);flex-shrink:0}.add-words-dialog__title{margin:0;font-size:1.1rem;font-weight:700}.add-words-dialog__body{overflow-y:auto;flex:1;min-height:0;padding:8px 0}.add-words-dialog__footer{padding:var(--page-padding);border-top:1px solid var(--color-border);flex-shrink:0}.add-collection__all-added{padding:20px var(--page-padding);color:var(--color-text-muted);text-align:center;font-size:.9rem;margin:0}.add-collection__import-section{padding:14px var(--page-padding);border-top:1px solid var(--color-border);display:flex;flex-direction:column;gap:10px}.add-collection__import-title{margin:0;font-size:.78rem;font-weight:700;color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.07em}.add-collection__url-row{display:flex;gap:6px}.add-collection__url-input{flex:1;padding:8px 10px;border:1px solid var(--color-border);border-radius:var(--radius);font-size:.875rem;background:var(--color-surface);color:inherit;min-width:0}.add-collection__url-input:focus{outline:2px solid var(--color-accent);outline-offset:1px}.collection-item{display:flex;align-items:center;gap:14px;padding:14px var(--page-padding);cursor:pointer;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent}.collection-item:active{background:var(--color-surface)}.collection-item__check{width:22px;height:22px;border-radius:50%;border:2px solid var(--color-border);flex-shrink:0;display:flex;align-items:center;justify-content:center;transition:background .15s,border-color .15s}.collection-item__check--selected{background:var(--color-accent);border-color:var(--color-accent);color:#fff}.collection-item__info{flex:1}.collection-item__name{font-weight:600;font-size:.95rem}.collection-item__meta{font-size:.8rem;color:var(--color-text-muted);margin-top:2px}.add-collection__group{border-bottom:1px solid var(--color-border)}.add-collection__group:last-of-type{border-bottom:none}.add-collection__group-header{display:flex;align-items:center;justify-content:space-between;padding:10px var(--page-padding);cursor:pointer;list-style:none;-webkit-user-select:none;user-select:none;font-weight:600;font-size:.85rem}.add-collection__group-header::-webkit-details-marker{display:none}.add-collection__group-header:after{content:"▾";font-size:.75rem;color:var(--color-text-muted);transition:transform .15s}.add-collection__group[open]>.add-collection__group-header:after{transform:rotate(-180deg)}.add-collection__group-name{flex:1}.add-collection__group-count{font-size:.75rem;color:var(--color-text-muted);font-weight:400;margin-right:6px}.collection-item__already{font-size:.75rem;color:var(--color-success);font-weight:600}.practice-mode-list{display:flex;flex-direction:column;gap:6px;padding-bottom:16px}.practice-mode-quick{padding:8px 0 4px}.mode-section-header{padding:14px 0 4px;font-size:.7rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--color-text-muted)}.mode-card{display:flex;align-items:center;gap:12px;padding:14px 12px;background:var(--color-surface);border-radius:var(--radius);border:none;width:100%;text-align:left;cursor:pointer;-webkit-tap-highlight-color:transparent;transition:background .12s}.mode-card:active{background:color-mix(in srgb,var(--color-accent) 8%,var(--color-surface))}.mode-card__icon{font-size:1.3rem;line-height:1;flex-shrink:0}.mode-card__name{flex:1;font-weight:600;font-size:.95rem;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mode-card__count{font-size:.8rem;color:var(--color-text-muted);white-space:nowrap;flex-shrink:0}.practice-splash{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;min-height:calc(100dvh - var(--nav-height));text-align:center;padding:24px;cursor:pointer;-webkit-tap-highlight-color:transparent}.practice-splash__icon{font-size:3.5rem;line-height:1}.practice-splash__label{margin:0;font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--color-text-muted)}.practice-splash__name{margin:0;font-size:1.5rem;font-weight:700}.practice-splash__count{margin:0;font-size:.9rem;color:var(--color-text-muted)}.practice-session{display:flex;flex-direction:column;min-height:calc(100dvh - var(--nav-height))}.practice-session__bar{display:flex;align-items:center;justify-content:space-between;padding:10px var(--page-padding);border-bottom:1px solid var(--color-border);flex-shrink:0}.practice-session__count{font-size:.85rem;color:var(--color-text-muted)}.question-card{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px var(--page-padding) 16px;gap:8px;text-align:center}.question-card__label{font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;color:var(--color-text-muted)}.question-card__prompt{margin:0}.question-card__prompt--character{font-size:5rem;line-height:1.1;font-weight:400}.question-card__prompt--pinyin{font-size:2rem;font-weight:500}.question-card__prompt--meaning{font-size:1.3rem;font-weight:500;max-width:280px}.choices{display:flex;flex-direction:column;gap:10px;padding:12px var(--page-padding) 0;width:100%;max-width:480px;margin:0 auto}.choice-btn{width:100%;padding:14px 16px;border-radius:var(--radius);border:2px solid var(--color-border);background:var(--color-bg);font-size:1rem;text-align:center;transition:border-color .12s,background .12s;cursor:pointer}.choice-btn--character{font-size:1.6rem;padding:10px 16px}.choice-btn--pinyin{font-size:1rem}.choice-btn--meaning{font-size:.95rem}.choice-btn:active:not(:disabled){background:var(--color-surface)}.choice-btn--correct{border-color:var(--color-success);background:#eafaf1}.choice-btn--wrong{border-color:var(--color-accent);background:var(--color-accent-light)}.practice-actions{padding:10px var(--page-padding) max(16px,env(safe-area-inset-bottom));max-width:480px;margin:0 auto;width:100%}.summary{display:flex;flex-direction:column;align-items:center;gap:24px;padding:40px var(--page-padding);text-align:center}.summary__icon{font-size:3rem}.summary__title{margin:0;font-size:1.4rem;font-weight:700}.summary__mode{margin:0;font-size:.85rem;color:var(--color-text-muted)}.summary__stats{display:flex;flex-direction:column;gap:12px;width:100%;max-width:320px}.stat-row{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;background:var(--color-surface);border-radius:var(--radius);font-size:.95rem}.stat-row__value{font-weight:700;font-size:1.05rem}.stat-row__value--positive{color:var(--color-success)}.stat-row__value--negative{color:var(--color-accent)}.vocab-list{display:flex;flex-direction:column;gap:8px;padding-bottom:8px}.vocab-row{display:flex;flex-direction:column;gap:8px;padding:14px 12px;background:var(--color-surface);border-radius:var(--radius);cursor:pointer;-webkit-tap-highlight-color:transparent;border:none;width:100%;text-align:left;transition:background .12s}.vocab-row:active{background:color-mix(in srgb,var(--color-accent) 8%,var(--color-surface))}.vocab-row--see-all{background:color-mix(in srgb,var(--color-accent) 8%,white)}.vocab-row__top{display:flex;align-items:center;gap:8px}.vocab-row__name{flex:1;font-weight:600;font-size:.95rem;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.vocab-row--see-all .vocab-row__name{color:var(--color-accent)}.vocab-row__actions{display:flex;align-items:center;gap:4px;flex-shrink:0}.vocab-row__count{font-size:.8rem;color:var(--color-text-muted);white-space:nowrap}.vocab-row__action-btn{background:none;border:none;padding:4px 6px;color:var(--color-text-muted);font-size:.8rem;cursor:pointer;border-radius:4px;line-height:1;flex-shrink:0}.vocab-row__action-btn:hover{background:var(--color-border)}.vocab-row__action-btn--danger{color:var(--color-accent)}.vocab-row__progress{display:flex;align-items:center;gap:8px}.vocab-row__progress-bar{flex:1;height:4px;background:var(--color-border);border-radius:2px;overflow:hidden}.vocab-row__progress-fill{height:100%;background:var(--color-success);border-radius:2px;transition:width .3s}.vocab-row__progress-label{font-size:.72rem;color:var(--color-text-muted);white-space:nowrap;flex-shrink:0}.vocab-group-header{padding:12px var(--page-padding) 4px;font-size:.7rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--color-text-muted)}.vocab-footer{display:flex;gap:8px;padding:12px 0 16px}.vocab-footer .btn{flex:1}.vocab-detail-header{display:flex;align-items:center;gap:8px;padding:12px 0;border-bottom:1px solid var(--color-border);margin-bottom:8px}.vocab-detail-header__title{flex:1;margin:0;font-size:1.1rem;font-weight:700;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.vocab-detail-header__actions{display:flex;gap:4px;flex-shrink:0}.btn--sm{padding:4px 10px;font-size:.8rem}.btn--danger{color:var(--color-accent)}.create-collection__fields{display:flex;flex-direction:column;gap:12px;padding:12px var(--page-padding);border-bottom:1px solid var(--color-border)}.create-collection__label{display:flex;flex-direction:column;gap:4px;font-size:.9rem;font-weight:600}.create-collection__optional{font-weight:400;color:var(--color-muted)}.create-collection__input{padding:8px 10px;border:1px solid var(--color-border);border-radius:var(--radius);font-size:1rem;background:var(--color-surface);color:inherit;width:100%;box-sizing:border-box}.create-collection__input:focus{outline:2px solid var(--color-accent);outline-offset:1px}.create-collection__search-row{display:flex;align-items:center;gap:8px;padding:10px var(--page-padding);border-bottom:1px solid var(--color-border)}.create-collection__search{flex:1;padding:8px 10px;border:1px solid var(--color-border);border-radius:var(--radius);font-size:.95rem;background:var(--color-surface);color:inherit;min-width:0}.create-collection__search:focus{outline:2px solid var(--color-accent);outline-offset:1px}.create-collection__count{font-size:.85rem;font-weight:600;color:var(--color-accent);white-space:nowrap}.create-collection__word-list{list-style:none;padding:0;margin:0}.create-collection__word-item{display:flex;align-items:center;gap:10px;padding:10px var(--page-padding);border-bottom:1px solid var(--color-border);cursor:pointer;-webkit-user-select:none;user-select:none}.create-collection__word-item:last-child{border-bottom:none}.create-collection__word-item:hover,.create-collection__word-item:focus{background:var(--color-surface);outline:none}.create-collection__word-item--selected{background:var(--color-accent-light)}.create-collection__word-check{width:22px;height:22px;border:2px solid var(--color-border);border-radius:4px;display:flex;align-items:center;justify-content:center;font-size:.75rem;flex-shrink:0;color:var(--color-accent)}.create-collection__word-item--selected .create-collection__word-check{background:var(--color-accent);border-color:var(--color-accent);color:#fff}.create-collection__word-char{font-size:1.3rem;width:2rem;flex-shrink:0;text-align:center}.create-collection__word-pinyin{font-size:.8rem;color:var(--color-muted);width:5rem;flex-shrink:0}.create-collection__word-meaning{font-size:.85rem;color:var(--color-muted);min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.create-collection__no-results{padding:20px var(--page-padding);color:var(--color-muted);text-align:center;font-size:.9rem}.share-dialog__body{padding:0;display:flex;flex-direction:column;gap:0}.share-dialog__info{padding:14px var(--page-padding) 4px;margin:0;font-size:.9rem;color:var(--color-muted)}.share-dialog__section{padding:14px var(--page-padding);border-top:1px solid var(--color-border);display:flex;flex-direction:column;gap:8px}.share-dialog__section-title{margin:0;font-size:.95rem;font-weight:700}.share-dialog__section-desc{margin:0;font-size:.85rem;color:var(--color-muted)}.share-dialog__url-row{display:flex;gap:8px;align-items:stretch}.share-dialog__url-input{flex:1;padding:8px 10px;border:1px solid var(--color-border);border-radius:var(--radius);font-size:.8rem;background:var(--color-surface);color:var(--color-muted);min-width:0}.share-dialog__copy-btn{flex-shrink:0}.share-dialog__too-large{margin:0;padding:0 var(--page-padding);font-size:.85rem;color:var(--color-accent)}.toast{position:fixed;bottom:calc(var(--nav-height) + env(safe-area-inset-bottom) + 12px);left:50%;transform:translate(-50%);padding:10px 20px;border-radius:var(--radius);font-size:.9rem;font-weight:600;white-space:nowrap;z-index:1000;pointer-events:none;animation:toast-in .2s ease}.toast--success{background:var(--color-success);color:#fff}.toast--error{background:var(--color-accent);color:#fff}@keyframes toast-in{0%{opacity:0;transform:translate(-50%) translateY(8px)}to{opacity:1;transform:translate(-50%) translateY(0)}}*,*:before,*:after{box-sizing:border-box}:root{--color-bg: #ffffff;--color-surface: #f7f7f7;--color-border: #e0e0e0;--color-text: #1a1a1a;--color-text-muted: #888;--color-accent: #c0392b;--color-accent-light: #fdecea;--color-success: #27ae60;--nav-height: 56px;--page-padding: 16px;--radius: 10px}html,body,#root{height:100%}body{margin:0;background:var(--color-bg);color:var(--color-text);font-family:system-ui,-apple-system,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overscroll-behavior:none}button{font-family:inherit;cursor:pointer}dialog::backdrop{background:#00000073}