@import "https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&family=Inter:wght@300;400;500;600;700&display=swap";:root{--font-ui:"Inter", system-ui, sans-serif;--font-cjk:"Noto Sans SC", sans-serif;--ink-black:#0f0e0d;--ink-dark:#1c1a18;--ink-mid:#2e2b28;--ink-grey:#4a4742;--ink-muted:#7a7570;--ink-light:#c8c3bc;--ink-pale:#f0ede8;--ink-white:#faf9f7;--red:#c0392b;--orange:#e67e22;--green:#27ae60;--blue:#2980b9;--purple:#8e44ad;--bg:var(--ink-white);--bg2:var(--ink-pale);--surface:#fff;--border:#ddd9d3;--text:var(--ink-dark);--text-muted:var(--ink-muted);--accent:#b5451b;--accent-h:#d4561f;--header-h:44px;--radius:10px;--shadow:0 2px 12px #0000001f;font-family:var(--font-ui);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;touch-action:manipulation;font-size:16px;line-height:1.5}@media (prefers-color-scheme:dark){:root{--bg:var(--ink-black);--bg2:var(--ink-dark);--surface:var(--ink-mid);--border:#3a3733;--text:var(--ink-pale);--text-muted:var(--ink-light);--accent:#e0622d;--accent-h:#f07840}}*,:before,:after{box-sizing:border-box}html,body{height:100%;margin:0;padding:0;overflow:hidden}#app{flex-direction:column;width:100%;height:100%;display:flex;position:relative;overflow:hidden}.app-header{height:var(--header-h);z-index:100;background:var(--bg);border-bottom:1px solid var(--border);-webkit-backdrop-filter:blur(8px);align-items:center;padding:0 12px;display:flex;position:fixed;top:0;left:0;right:0}.header-left,.header-right{flex:0 0 90px;align-items:center;display:flex}.header-right{justify-content:flex-end}.header-center{text-align:center;color:var(--text);flex:1;font-size:17px;font-weight:600}.header-timer,.header-remainder{color:var(--text-muted);font-variant-numeric:tabular-nums;font-size:13px}.btn-back{cursor:pointer;color:var(--accent);font-size:15px;font-family:var(--font-ui);background:0 0;border:none;align-items:center;gap:4px;padding:4px 8px;display:flex}.btn-back:active{opacity:.7}.view{inset:0;top:var(--header-h);-webkit-overflow-scrolling:touch;position:absolute;overflow:hidden auto}.slide-enter{animation:.25s both slideInRight}.slide-exit{animation:.25s both slideOutLeft}.slide-back-enter{animation:.25s both slideInLeft}.slide-back-exit{animation:.25s both slideOutRight}@keyframes slideInRight{0%{transform:translate(100%)}to{transform:translate(0)}}@keyframes slideOutLeft{0%{transform:translate(0)}to{transform:translate(-100%)}}@keyframes slideInLeft{0%{transform:translate(-100%)}to{transform:translate(0)}}@keyframes slideOutRight{0%{transform:translate(0)}to{transform:translate(100%)}}#view-index{min-height:calc(100dvh - var(--header-h));background:linear-gradient(170deg, var(--bg) 0%, var(--bg2) 100%);flex-direction:column;justify-content:center;align-items:center;gap:0;display:flex}.index-logo{font-family:var(--font-cjk);color:var(--accent);filter:drop-shadow(0 2px 8px #b5451b40);margin-bottom:8px;font-size:80px;font-weight:700;line-height:1}.index-title{letter-spacing:-.5px;color:var(--text);font-size:28px;font-weight:700}.index-version{color:var(--text-muted);margin-bottom:40px;font-size:13px}.index-website{margin-top:16px}.btn-write{background:var(--accent);color:#fff;cursor:pointer;letter-spacing:-.2px;font-size:20px;font-weight:600;font-family:var(--font-ui);border:none;border-radius:50px;margin-bottom:36px;padding:14px 56px;transition:background .15s,transform .1s,box-shadow .15s;display:block;box-shadow:0 4px 20px #b5451b59}.btn-write:active{background:var(--accent-h);transform:scale(.97);box-shadow:0 2px 8px #b5451b33}.index-options{gap:12px;display:flex}.btn-option{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);cursor:pointer;font-size:13px;font-family:var(--font-ui);flex-direction:column;align-items:center;gap:6px;padding:14px 22px;transition:background .15s,transform .1s;display:flex}.btn-option:active{background:var(--bg2);transform:scale(.96)}.btn-option .icon{font-size:22px}.settings-list,.lists-list{max-width:600px;margin:0 auto;padding:8px 12px 40px}.section-divider{letter-spacing:.6px;text-transform:uppercase;color:var(--text-muted);padding:20px 12px 6px;font-size:12px;font-weight:600}.list-item{background:var(--surface);border-radius:var(--radius);color:var(--text);border:1px solid var(--border);justify-content:space-between;align-items:center;margin-bottom:2px;padding:14px 16px;font-size:15px;transition:background 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var(--border);text-align:right;background:var(--bg);width:72px;color:var(--text);font-size:15px;font-family:var(--font-ui);border-radius:6px;padding:4px 8px}.select-input{border:1px solid var(--border);background:var(--bg);color:var(--text);font-size:15px;font-family:var(--font-ui);cursor:pointer;border-radius:6px;padding:4px 8px}#view-teach{height:calc(100% - var(--header-h));padding-bottom:calc(56px + env(safe-area-inset-bottom,0px));flex-direction:column;display:flex}.teach-prompt{text-align:center;padding:8px 16px}.teach-pinyin{color:var(--accent);font-size:20px;font-weight:500;font-family:var(--font-cjk);min-height:28px}.teach-definition{color:var(--text-muted);min-height:20px;font-size:14px}.teach-canvas-wrap{flex:1;justify-content:center;align-items:center;padding:8px;display:flex;position:relative}.teach-canvas-inner{box-shadow:var(--shadow);aspect-ratio:1;border-radius:12px;max-width:100%;max-height:100%;margin:0 auto;position:relative;overflow:hidden}#teach-canvas canvas{background:#faf9f7;display:block}@media (prefers-color-scheme:dark){#teach-canvas canvas{background:#f5f2ed}.teach-canvas-inner{box-shadow:0 2px 20px #00000080}}.teach-controls{z-index:90;padding:10px 20px;padding-bottom:calc(10px + env(safe-area-inset-bottom,0px));border-top:1px solid var(--border);background:var(--bg);justify-content:space-around;display:flex;position:fixed;bottom:0;left:0;right:0}.teach-ctrl{cursor:pointer;color:var(--text-muted);background:0 0;border:none;border-radius:8px;padding:8px 16px;font-size:24px;transition:color .15s,background .15s}.teach-ctrl:hover{color:var(--text);background:var(--bg2)}.teach-ctrl:active{transform:scale(.9)}.error-card{text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:16px;height:100%;padding:24px;display:flex}.error-card h2{color:var(--text-muted);margin:0;font-size:20px}.error-option-btn{background:var(--surface);border:1px solid var(--border);cursor:pointer;width:100%;max-width:320px;font-size:15px;font-family:var(--font-ui);color:var(--text);border-radius:8px;padding:12px 20px;transition:background .15s}.error-option-btn:active{background:var(--bg2)}.load-error-card{text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:16px;height:280px;padding:24px;display:flex}.load-error-card p{color:var(--text-muted);max-width:320px;margin:0;font-size:15px}.grading-overlay{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#0009;border-radius:12px;justify-content:space-around;align-items:center;display:flex;position:absolute;inset:0}.grade-btn{cursor:pointer;color:#fff;background:0 0;border:none;border-radius:50%;flex-direction:column;align-items:center;gap:6px;padding:12px;font-size:28px;transition:transform .1s;display:flex}.grade-btn:active{transform:scale(1.2)}.grade-btn span{opacity:.8;font-size:11px}.regrade-icon{color:#ffffffb3;cursor:pointer;font-size:22px;transition:color .15s;position:absolute;top:8px;right:8px}.regrade-icon:hover{color:#fff}.answer-panel{background:var(--bg);z-index:200;transition:transform .3s cubic-bezier(.2,.8,.4,1);position:fixed;inset:0;overflow-y:auto;transform:translateY(100%)}.answer-panel.visible{transform:translateY(0)}.answer-header{border-bottom:1px solid var(--border);background:var(--bg);z-index:10;align-items:center;padding:12px 16px;display:flex;position:sticky;top:0}.answer-char{font-family:var(--font-cjk);color:var(--accent);margin-right:12px;font-size:28px;font-weight:700}.answer-title{flex:1;font-size:16px;font-weight:600}.answer-body{max-width:600px;margin:0 auto;padding:16px 12px 40px}.answer-animation{justify-content:center;margin-bottom:20px;display:flex}.panel-section{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;overflow:hidden}.panel-heading{letter-spacing:.6px;text-transform:uppercase;color:var(--text-muted);background:var(--bg2);border-bottom:1px solid var(--border);padding:10px 14px;font-size:12px;font-weight:600}.panel-body{padding:12px 14px}.metadata-field{align-items:flex-start;gap:8px;margin-bottom:8px;font-size:14px;display:flex}.metadata-field:last-child{margin-bottom:0}.field-label{color:var(--text-muted);text-transform:uppercase;min-width:32px;padding-top:2px;font-size:12px;font-weight:600}.field-value{color:var(--text);flex:1}.field-value a{color:var(--accent);cursor:pointer}.decomp-node{align-items:baseline;gap:6px;margin-bottom:4px;font-size:14px;display:flex}.decomp-node.indent{padding-left:20px}.decomp-val{font-family:var(--font-cjk);color:var(--accent);font-weight:600}.decomp-label{color:var(--text)}.decomp-link{color:var(--accent);cursor:pointer;text-decoration:underline}.popup-backdrop{z-index:300;background:#00000080;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.popup-box{background:var(--surface);border-radius:14px;width:100%;max-width:360px;overflow:hidden;box-shadow:0 8px 40px #0000004d}.popup-title{text-align:center;color:var(--text);padding:18px 20px 10px;font-size:17px;font-weight:600}.popup-text{color:var(--text-muted);text-align:center;padding:0 20px 16px;font-size:14px;line-height:1.5}.popup-actions{border-top:1px solid var(--border);display:flex}.popup-btn{cursor:pointer;color:var(--accent);font-size:16px;font-family:var(--font-ui);background:0 0;border:none;flex:1;padding:14px;transition:background .1s}.popup-btn+.popup-btn{border-left:1px solid var(--border)}.popup-btn.bold{font-weight:600}.popup-btn:active{background:var(--bg2)}.blacklist-item{align-items:center;gap:10px;display:flex}.blacklist-word{font-family:var(--font-cjk);color:var(--accent);font-size:20px;font-weight:700}.blacklist-info{color:var(--text-muted);flex:1;font-size:14px}.remove-btn{color:var(--text-muted);cursor:pointer;background:0 0;border:none;padding:4px;font-size:20px}.remove-btn:hover{color:var(--red)}.assets-view{text-align:center;flex-direction:column;align-items:center;gap:16px;max-width:600px;margin:0 auto;padding:20px 12px 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a{color:var(--accent)}.stroke-animation{cursor:pointer}.flex-spacer{flex:1}.mt8{margin-top:8px}.modal-field{flex-direction:column;gap:6px;margin-bottom:14px;display:flex}.modal-field label{color:var(--text-muted);font-size:13px}.modal-field input[type=text],.modal-field input[type=file]{border:1px solid var(--border);background:var(--bg);color:var(--text);font-size:15px;font-family:var(--font-ui);border-radius:8px;width:100%;padding:10px 12px}.assets-view-container{background:linear-gradient(135deg, var(--bg) 0%, var(--bg2) 100%);z-index:1000;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.loader-card{background:var(--surface);border:1px solid var(--border);text-align:center;border-radius:16px;width:100%;max-width:400px;padding:40px 24px;box-shadow:0 10px 30px #0000001a}.assets-logo{font-family:var(--font-cjk);color:var(--accent);filter:drop-shadow(0 4px 8px #b5451b33);margin-bottom:16px;font-size:64px}.assets-title{color:var(--text);margin:0 0 16px;font-size:20px;font-weight:700}.progress-container{margin-top:24px}.status{color:var(--text-muted);margin-bottom:12px;font-size:14px}.progress-bar{background:var(--bg2);border-radius:4px;height:8px;margin-bottom:12px;overflow:hidden}.progress-fill{background:var(--accent);border-radius:4px;height:100%;transition:width .3s}.assets-warning{color:var(--orange);margin:8px 0 0;font-size:12px}.info-container{margin-top:20px}.desc{color:var(--text-muted);margin-bottom:24px;font-size:14px;line-height:1.6}.error-msg{color:var(--red);margin-bottom:24px;font-size:14px}.btn-download{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:50px;padding:12px 32px;font-size:16px;font-weight:600;transition:background .15s,transform .1s;box-shadow:0 4px 12px #b5451b4d}.btn-download:active{background:var(--accent-h);transform:scale(.97)}.stats-view{max-width:600px;margin:0 auto;padding:8px 12px 40px}.stats-grid{grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:16px;display:grid}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);border-left:3px solid var(--accent);text-align:center;padding:14px 12px;transition:background .1s}.stat-value{color:var(--text);font-variant-numeric:tabular-nums;font-size:24px;font-weight:700;line-height:1.2}.stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.4px;margin-top:4px;font-size:11px;font-weight:500}.stats-overall-progress{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:8px;padding:14px 16px}.stat-progress-label{color:var(--text-muted);justify-content:space-between;margin-bottom:8px;font-size:13px;display:flex}.stat-progress{background:var(--bg2);border-radius:8px;height:8px;overflow:hidden}.stat-progress-bar{border-radius:8px;height:100%;transition:width .3s}.stat-progress-segmented{gap:0;display:flex}.stat-progress-segmented .stat-progress-bar{border-radius:0}.stat-progress-segmented .stat-progress-bar:first-child{border-radius:8px 0 0 8px}.stat-progress-segmented .stat-progress-bar:last-child{border-radius:0 8px 8px 0}.stat-progress-segmented .stat-progress-bar:only-child{border-radius:8px}.stat-progress-mastered{background:#1b5e20}.stat-progress-learned{background:#66bb6a}.stat-progress-remaining{background:var(--bg2)}.list-stat-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:2px;padding:14px 16px}.list-stat-header{justify-content:space-between;align-items:center;margin-bottom:8px;display:flex}.list-stat-name{color:var(--text);font-size:14px;font-weight:600}.list-stat-count{color:var(--text-muted);font-variant-numeric:tabular-nums;font-size:13px}.list-stat-detail{color:var(--text-muted);justify-content:space-between;margin-top:6px;font-size:12px;display:flex}.stat-number{color:var(--text);font-variant-numeric:tabular-nums;font-weight:600}.add-btn{border:2px solid var(--accent);width:28px;height:28px;color:var(--accent);cursor:pointer;background:0 0;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;padding:0;font-size:18px;font-weight:600;line-height:1;display:flex}.add-btn:hover{background:var(--accent);color:#fff}.add-btn:disabled{opacity:.4}.add-word-view{max-width:600px;margin:0 auto;padding:16px 12px 40px}.add-word-header{align-items:center;gap:12px;margin-bottom:24px;display:flex}.add-word-title{color:var(--text);font-size:17px;font-weight:600}.add-word-body{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px 16px}.add-word-error{color:var(--red);background:#ff000014;border-radius:8px;margin-bottom:16px;padding:10px 14px;font-size:13px}.add-word-submit{background:var(--accent);color:#fff;cursor:pointer;width:100%;font-size:16px;font-weight:600;font-family:var(--font-ui);border:none;border-radius:10px;margin-top:8px;padding:14px 32px;transition:background .15s,opacity .15s}.add-word-submit:active{background:var(--accent-h)}.add-word-submit:disabled{opacity:.5;cursor:default}.list-toggle-group{margin-bottom:2px}.list-words-expanded{background:var(--bg2);border:1px solid var(--border);border-radius:0 0 var(--radius) var(--radius);border-top:none;overflow:hidden}.list-word-row{border-top:1px solid var(--border);justify-content:space-between;align-items:center;gap:8px;padding:10px 16px;display:flex}.list-word-row.muted{color:var(--text-muted);justify-content:center;font-size:13px}.list-word-info{flex:1;align-items:center;gap:10px;min-width:0;display:flex}.list-word-char{font-family:var(--font-cjk);color:var(--accent);flex-shrink:0;font-size:20px;font-weight:700}.list-word-meta{color:var(--text-muted);text-overflow:ellipsis;white-space:nowrap;font-size:13px;overflow:hidden}.trash-btn{cursor:pointer;color:var(--text-muted);background:0 0;border:none;flex-shrink:0;padding:4px 6px;font-size:18px;transition:color .15s}.trash-btn:hover{color:var(--red)}.trash-btn:disabled{opacity:.4;cursor:default}