:root{--primary: #4f6ef7;--primary-dark: #3b55d9;--success: #22a06b;--warning: #e8a33d;--danger: #d94f4f;--demo: #b45309;--demo-bg: #fef3c7;--bg: #f4f5f9;--card-bg: #ffffff;--text: #1f2430;--text-2: #5a6272;--border: #e3e6ee;--radius: 12px;--shadow: 0 1px 3px rgba(31, 36, 48, .08)}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,PingFang SC,Microsoft YaHei,sans-serif;font-size:15px;line-height:1.6;-webkit-tap-highlight-color:transparent}#root{min-height:100vh}.app-shell{min-height:100vh;display:flex;flex-direction:column;max-width:860px;margin:0 auto}.app-header{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:var(--card-bg);border-bottom:1px solid var(--border)}.app-title{font-weight:700;font-size:17px;color:var(--primary)}.header-settings{font-size:20px;text-decoration:none}.app-main{flex:1;padding:16px 16px 88px}.app-nav{position:fixed;bottom:0;left:0;right:0;z-index:20;display:flex;background:var(--card-bg);border-top:1px solid var(--border);max-width:860px;margin:0 auto;padding-bottom:env(safe-area-inset-bottom)}.nav-item{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 0 6px;text-decoration:none;color:var(--text-2);font-size:12px}.nav-item.active{color:var(--primary);font-weight:600}.nav-icon{font-size:20px;line-height:1}@media (min-width: 768px){.app-main{padding-bottom:32px}.app-nav{padding:6px 0}}.page-title{font-size:20px;font-weight:700;margin:4px 0 16px}.section{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin-bottom:16px}.section-title{font-size:15px;font-weight:700;margin:0 0 10px;display:flex;align-items:center;justify-content:space-between}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:none;border-radius:10px;padding:10px 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var(--primary);outline-offset:-1px}.chips{display:flex;flex-wrap:wrap;gap:6px}.chip{display:inline-flex;align-items:center;gap:4px;background:#eef1fd;color:var(--primary);border-radius:999px;padding:3px 10px;font-size:12.5px;font-weight:600}.chip .chip-remove{cursor:pointer;font-weight:700;opacity:.7}.chip.plain{background:#f0f2f6;color:var(--text-2)}.chip.warn{background:#fdeeee;color:var(--danger)}.empty-state{text-align:center;color:var(--text-2);padding:40px 16px}.empty-state .empty-icon{font-size:40px;display:block;margin-bottom:8px}.toast{position:fixed;bottom:96px;left:50%;transform:translate(-50%);background:#1f2430eb;color:#fff;padding:10px 18px;border-radius:10px;font-size:14px;z-index:100;max-width:86vw;text-align:center}.progress-bar{height:8px;background:#e8ebf3;border-radius:999px;overflow:hidden}.progress-bar .fill{height:100%;background:var(--primary);border-radius:999px;transition:width .2s ease}.storage-error{max-width:520px;margin:80px 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.btn{width:100%}.choice-desc{font-size:12px;font-weight:400;opacity:.85;display:block}.rating-row{display:flex;gap:10px;margin-top:14px}.rating-btn{flex:1;min-height:52px;border:none;border-radius:12px;font-size:16px;font-weight:700;cursor:pointer;color:#fff;transition:transform .08s ease,filter .15s ease}.rating-btn:active{transform:scale(.97)}.rating-btn.know{background:var(--success)}.rating-btn.barely{background:var(--warning)}.rating-btn.forgot{background:var(--danger)}.rating-btn .rating-sub{display:block;font-size:11.5px;font-weight:400;opacity:.9}.import-source{display:grid;grid-template-columns:1fr 1fr;gap:10px}.source-btn{border:1px dashed var(--border);background:#fbfcfe;border-radius:12px;padding:18px 10px;text-align:center;cursor:pointer;font-size:14px;font-weight:600;color:var(--text)}.source-btn .source-icon{display:block;font-size:26px;margin-bottom:4px}.source-btn input{display:none}.drop-zone{border:2px dashed 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10px;font-size:14px;background:#fbfcfe}.tag-picker .tag-add-btn{border:1px solid var(--primary);color:var(--primary);background:#fff;border-radius:8px;padding:8px 14px;font-weight:600;cursor:pointer}.flash-stage{perspective:1400px;margin:12px 0}.flash-card{position:relative;height:380px;transform-style:preserve-3d;transition:transform .45s cubic-bezier(.2,.7,.3,1);will-change:transform;cursor:pointer}.flash-card.flipped{transform:rotateY(180deg)}.flash-face{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:var(--card-bg);border-radius:16px;box-shadow:var(--shadow);padding:20px;overflow-y:auto;display:flex;flex-direction:column}.flash-face.back{transform:rotateY(180deg)}.flash-label{font-size:12px;font-weight:700;color:var(--text-2);letter-spacing:2px;margin-bottom:10px}.flash-question{flex:1;font-size:16px;white-space:pre-wrap;word-break:break-all}.flash-options{margin-top:10px;font-size:14px;color:var(--text-2)}.flash-answer{flex:1;font-size:15.5px;white-space:pre-wrap;word-break:break-all}.flash-answer .answer-line{font-weight:700;color:var(--success);margin-bottom:8px}.flash-answer 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.pi-question{white-space:pre-wrap;word-break:break-all;font-size:14.5px}.paper-item .pi-answer-space{min-height:72px;border-bottom:1px dashed var(--border);margin-top:8px}.paper-item .pi-ans{margin-top:8px;font-size:13.5px}.paper-item .pi-ans .correct{color:var(--success);font-weight:700}.paper-item .pi-ans .analysis{color:var(--text-2);margin-top:4px;white-space:pre-wrap}.paper-item .pi-source{margin-top:6px;font-size:12px;color:var(--text-2)}.settings-row{display:flex;justify-content:space-between;align-items:center;padding:10px 0;border-bottom:1px solid var(--border);font-size:14px}.settings-row:last-child{border-bottom:none}.lexicon-row{display:flex;align-items:center;gap:8px;padding:8px 0;border-bottom:1px solid var(--border);font-size:13.5px}.lexicon-row:last-child{border-bottom:none}.lexicon-row .lex-kw{font-weight:600}.lexicon-row .lex-kp{color:var(--text-2);flex:1}.result-stat{display:flex;gap:12px;justify-content:center;margin:12px 0;text-align:center}.result-stat 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