:root{--bg: #f6f6f7;--panel: #ffffff;--text: #121212;--muted: #9b9ca3;--line: #e8e8ed;--blue: #1885ff;--orange: #ff9800;--star: #ffb400;--orange-soft: #fff6e5;--green: #76a92a;--red: #cf2424;--ink: #080f95;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}body{margin:0;min-height:100vh;color:var(--text);background:var(--bg)}button,select,input{font:inherit}button{border:0;cursor:pointer}button:disabled{cursor:not-allowed;opacity:.45}.app-shell{min-height:100vh}.topbar{position:sticky;top:0;z-index:20;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;min-height:72px;padding:16px 28px;background:#f6f6f7eb;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.floating-notice{position:fixed;top:84px;left:50%;z-index:40;width:min(520px,calc(100vw - 32px));padding:12px 16px;border:1px solid #f4d5a4;border-radius:8px;color:#8a4d00;background:#fff8e6;box-shadow:0 10px 28px #37415129;font-size:14px;font-weight:700;line-height:1.45;text-align:center;transform:translate(-50%)}.floating-notice.warn{border-color:#f4d5a4;color:#8a4d00;background:#fff8e6}.topbar-title{font-size:24px;font-weight:750;text-align:center}.topbar-left,.topbar-right{display:flex;align-items:center;gap:12px}.topbar-right{justify-content:flex-end}.account-chip{max-width:180px;overflow:hidden;color:#555;font-size:15px;font-weight:700;text-overflow:ellipsis;white-space:nowrap}.star-symbol{color:var(--star)}.star-detail-btn{width:28px;height:28px;border-radius:6px;color:var(--star);background:#fff9df}.link-btn{color:var(--blue);background:transparent;font-size:20px;font-weight:650}.link-btn.danger{color:var(--red)}.home-icon-btn{display:inline-flex;align-items:center;justify-content:center;position:relative;width:32px;height:32px;color:var(--blue);background:transparent}.home-icon-roof{position:absolute;top:8px;width:15px;height:15px;border-top:2.4px solid currentColor;border-left:2.4px solid currentColor;transform:rotate(45deg);transform-origin:center}.refresh-icon{display:block}.home-icon-body{position:absolute;top:15px;width:15px;height:11px;border:2.4px solid currentColor;border-top:0;border-radius:1px 1px 3px 3px}.subtle-btn{min-height:44px;padding:0 22px;border-radius:22px;color:#666;background:#e9e9ec}.primary-outline{min-height:46px;padding:0 28px;border:2px solid var(--orange);border-radius:24px;color:var(--orange);background:#fffaf0;font-weight:700}.primary-outline.danger{border-color:var(--red);color:var(--red);background:#fff5f5}.hidden-file-input{display:none}.primary-fill{min-height:52px;padding:0 34px;border-radius:28px;color:#fff;background:var(--blue);font-weight:750}.page{padding:18px 28px 48px}.home-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;max-width:1180px;margin:0 auto}.home-summary{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;max-width:1180px;margin:0 auto 16px}.home-summary>div{padding:12px 18px;border:1px solid var(--line);border-radius:8px;background:#fff}.summary-label{color:var(--muted);font-size:14px;font-weight:700;display:flex;align-items:center;gap:6px}.summary-value{margin-top:4px;font-size:19px;font-weight:800}.summary-hint{margin-top:4px;color:#687384;font-size:13px;font-weight:650}.summary-progress-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.home-card{min-height:150px;padding:24px 26px;border-radius:24px;background:#e2f6ff;text-align:left}.home-card.major{grid-column:1 / -1;background:#fff0d9}.home-features{max-width:1180px;margin:28px auto 0;padding:24px 26px;border:1px solid var(--line);border-radius:24px;background:#fff}.features-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px}.features-title{font-size:20px;font-weight:800;color:var(--text)}.feature-visibility-btn{display:grid;flex:0 0 36px;place-items:center;width:36px;height:36px;padding:0;border:0;border-radius:6px;color:var(--muted);background:transparent}.feature-visibility-btn:hover{color:var(--text);background:#f1f5f9}.home-features-restore{display:flex;justify-content:flex-end;max-width:1180px;margin:18px auto 0}.feature-restore-btn{display:inline-flex;align-items:center;gap:8px;padding:8px 10px;border:0;border-radius:6px;color:var(--muted);background:transparent;font-size:14px;font-weight:650}.feature-restore-btn:hover{color:var(--text);background:#f1f5f9}.features-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.feature-item{display:flex;align-items:flex-start;gap:14px}.feature-icon{flex-shrink:0;display:grid;place-items:center;width:46px;height:46px;border-radius:14px;color:var(--blue);background:#eef6ff}.feature-text{display:flex;flex-direction:column;gap:4px}.feature-text strong{font-size:16px;font-weight:750;color:var(--text)}.feature-text span{font-size:14px;line-height:1.5;color:var(--muted)}@media (max-width: 900px){.features-grid{grid-template-columns:1fr}}.card-title{display:flex;align-items:center;gap:14px;font-size:26px;font-weight:800}.card-icon{display:grid;place-items:center;width:72px;height:72px;border-radius:18px;color:var(--orange);background:#fff;font-size:0}.card-sub{margin:18px 0 0 124px;font-size:24px}.book-picker-mask{position:fixed;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;background:#0006;z-index:50}.book-picker{width:min(420px,90vw);padding:24px;border-radius:16px;background:#fff;box-shadow:0 12px 44px #00000038}.book-picker-title{font-size:20px;font-weight:800;margin-bottom:14px}.book-picker-label{font-size:14px;color:var(--muted);font-weight:700;margin:14px 0 8px}.book-picker-row{display:flex;flex-wrap:wrap;gap:10px}.picker-option{padding:10px 16px;border:1px solid var(--line);border-radius:10px;font-weight:700;color:#1f1f21;background:#fff}.picker-option.active{border-color:var(--orange);color:var(--orange);background:#fff6ea}.book-picker-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:22px}.segmented{display:inline-flex;flex-wrap:wrap;max-width:100%;margin:0 0 28px max(0px,calc((100% - 1220px)/2));padding:3px;border-radius:10px;background:#e7e7ea}.segment{min-width:140px;padding:12px 18px;border-radius:8px;color:#1f1f21;background:transparent;font-weight:700}.segment.active{background:#fff;box-shadow:0 1px 5px #0000001f}.lesson-table-tabs{min-height:42px}.lesson-table-tabs .segment{min-width:96px}.lesson-results{position:relative;min-height:140px}.lesson-list-loading{position:absolute;inset:0 0 auto;z-index:8;display:flex;align-items:center;justify-content:center;gap:10px;min-height:64px;padding:12px 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#e7b65e;color:#633b00;background:#fff2d6}.global-api-error-copy{display:grid;gap:2px;min-width:0}.global-api-error-copy span{overflow-wrap:anywhere}.global-api-error-actions{display:flex;align-items:center;flex:0 0 auto;gap:8px;margin-left:auto}.global-api-error-actions .primary-fill{min-width:96px;padding:9px 14px}.global-api-error-close{width:38px;height:38px;border:0;color:#633b00;background:transparent;font-size:24px;line-height:1}.settings-account{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-top:18px;padding:18px 22px;border:1px solid var(--line);border-radius:8px;background:#fff}.settings-account-actions{display:flex;align-items:center;gap:12px}.stars-panel{display:grid;gap:18px;max-width:980px;margin:0 auto 28px;padding:30px 36px;border-radius:8px;background:#fff}.star-wallet-head{display:flex;align-items:center;gap:24px}.star-wallet-balance{margin-top:4px;color:#555;font-size:30px;font-weight:850}.star-wallet-totals{display:flex;flex-wrap:wrap;gap:8px 18px;margin-right:auto;color:#687384;font-size:14px;font-weight:650}.star-redeem-form{display:grid;grid-template-columns:140px minmax(180px,1fr) minmax(180px,1fr);gap:12px}.star-redeem-dialog{width:min(520px,calc(100vw - 32px))}.star-redeem-dialog .star-redeem-form{grid-template-columns:1fr;margin-top:16px}.star-redeem-dialog .star-redeem-form .dialog-error,.star-redeem-dialog .star-redeem-actions{grid-column:auto}.star-redeem-balance{margin-top:12px;font-size:18px;font-weight:800}.star-redeem-tip{margin-top:10px;padding:12px 14px;border-left:3px solid var(--star);color:#66541f;background:#fff9df;font-size:14px;font-weight:650;line-height:1.6}.star-redeem-form .dialog-error,.star-redeem-actions{grid-column:1 / -1}.star-redeem-actions{display:flex;justify-content:flex-end;gap:10px}.star-ledger{display:grid;gap:0}.star-ledger-title{padding-bottom:10px;border-bottom:1px solid var(--line);font-size:18px;font-weight:800}.star-ledger-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 0;border-bottom:1px solid var(--line)}.star-ledger-row:last-child{border-bottom:0}.star-ledger-row div{display:grid;gap:3px}.star-ledger-row>div span{color:var(--muted);font-size:13px}.stars-panel .star-symbol{color:var(--star)}.star-ledger-row b{color:var(--green)}.star-ledger-row b.debit{color:var(--red)}.auth-page{display:grid;place-items:start center}.auth-panel{width:min(440px,calc(100vw - 48px));margin-top:48px;padding:28px;border:1px solid var(--line);border-radius:8px;background:#fff}.auth-title{font-size:28px;font-weight:800}.auth-sub{margin-top:8px;color:var(--muted);font-size:16px;line-height:1.5}.auth-form{display:grid;gap:12px;margin-top:20px}.auth-error{color:var(--red);font-size:15px;font-weight:650}.auth-panel>.link-btn{margin-top:14px;font-size:16px}.unit-card,.record-card,.mistake-section,.settings-panel,.preview-panel,.analysis-card{max-width:1220px;margin:0 auto 28px;padding:34px 40px;border-radius:22px;background:var(--panel)}.lesson-list{display:grid;gap:22px;max-width:1220px;margin:0 auto 28px}.unit-title{display:flex;align-items:center;gap:12px;margin-bottom:26px;font-size:30px;font-weight:800}.lesson-card{padding:24px 32px;border-radius:22px;background:var(--panel)}.lesson-card.completed{border:1px solid #dbece0;background:#fbfffc}.lesson-card.focus-highlight{outline:3px solid rgba(31,109,196,.48);outline-offset:3px;box-shadow:0 10px 28px #1f6dc429;transition:outline-color .18s ease,box-shadow .18s ease}.lesson-row{padding:22px 0;border-top:1px solid var(--line)}.lesson-row:first-of-type{border-top:0}.lesson-main{display:flex;align-items:center;justify-content:space-between;gap:24px}.review-actions{display:grid;grid-template-columns:repeat(3,minmax(220px,1fr));gap:14px;margin:-8px 0 24px}.review-action{display:grid;gap:6px;min-height:84px;padding:16px 18px;border:2px solid transparent;border-radius:10px;text-align:left;box-shadow:0 8px 20px #37415114}.review-action strong{font-size:20px;font-weight:850}.review-action span{font-size:14px;font-weight:650;line-height:1.35}.review-action.primary{color:#fff;background:var(--blue)}.review-action.primary span{color:#ffffffdb}.review-action.secondary{border-color:var(--orange);color:var(--orange);background:#fffaf0}.review-action.secondary span{color:#8a5a00}.review-action.weak{border-color:#d23f3f;color:#c0392b;background:#fdf0f0}.review-action.weak span{color:#9b2c2c}.review-action:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}.lesson-name{font-size:24px;font-weight:700}.lesson-title-row{display:flex;align-items:center;flex-wrap:wrap;gap:10px}.lesson-status{display:inline-flex;align-items:center;min-height:24px;padding:0 9px;border-radius:12px;font-size:13px;font-weight:800}.lesson-status.done{color:#1f7a3f;background:#e8f7ed}.lesson-count{margin-top:6px;color:var(--muted);font-size:17px}.lesson-progress-inline{color:#33536f;font-weight:700}.lesson-actions{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:10px;min-width:420px}.lesson-actions .primary-outline.compact{width:auto;min-height:34px;padding:0 14px;border-width:1.5px;border-radius:17px;font-size:15px}.lesson-actions .primary-outline.compact .btn-ico,.btn-ico{width:16px;height:16px;margin-right:6px;vertical-align:-3px}.practice-toolbar{display:flex;align-items:center;justify-content:center;gap:38px;margin:10px 0 24px}.page-indicator{font-size:26px;font-weight:650}.grid-wrap{display:grid;grid-template-columns:repeat(4,minmax(190px,1fr));gap:62px 46px;align-items:start}.grid-wrap.dictation-grid{grid-template-columns:1fr;justify-items:center;gap:48px 0;--cell-size: 170px}.word-cell{min-width:0;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}.prompt-row{display:grid;grid-template-columns:calc(var(--char-count) * var(--cell-size, 110px));align-items:center;justify-content:center;margin:0 0 10px;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}.prompt-row.active,.dictation-context.active{grid-template-columns:auto var(--cell-size, 110px) auto;column-gap:10px}.prompt-center{position:relative;width:calc(var(--char-count) * var(--cell-size, 110px))}.pinyin-row{display:grid;grid-template-columns:repeat(var(--char-count),var(--cell-size, 110px));width:calc(var(--char-count) * var(--cell-size, 110px));color:#666;text-align:center;font-size:calc(var(--cell-size, 110px) * .2727);line-height:1.15;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}.prompt-row.active .prompt-center,.prompt-row.active .pinyin-row{width:var(--cell-size, 110px)}.listen-btn{position:absolute;top:50%;right:-58px;transform:translateY(-50%);display:grid;place-items:center;width:48px;height:48px;border-radius:50%;color:var(--blue);background:#eef6ff;font-size:26px;font-weight:800}.writing-box{position:relative;display:grid;grid-template-columns:repeat(var(--char-count),var(--cell-size, 110px));width:calc(var(--char-count) * var(--cell-size, 110px));height:var(--cell-size, 110px);margin:0 auto;overflow:hidden;border:1.5px solid #bbb;border-radius:14px;background:#fff;touch-action:none;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}.writing-box.selected{outline:3px solid #74b6ff}.dictation-context{display:grid;grid-template-columns:calc(var(--char-count) * var(--cell-size, 110px));align-items:center;justify-content:center}.dictation-context.active{display:grid;align-items:center;justify-content:center}.dictation-context.active .writing-box{width:var(--cell-size, 110px);margin:0}.context-text{color:#222;font-family:STKaiti,Kaiti SC,KaiTi,serif;font-size:calc(var(--cell-size, 110px) * .527);line-height:1;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}.context-text.ghost{visibility:hidden;pointer-events:none}.char-grid{position:relative;border-left:1px solid #bbb;touch-action:none;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}.char-grid:first-child{border-left:0}.char-grid:before,.char-grid:after{content:"";position:absolute;z-index:0;pointer-events:none}.char-grid:before{left:50%;top:0;bottom:0;border-left:2px dashed #d2d2d2}.char-grid:after{left:0;right:0;top:50%;border-top:2px dashed #d2d2d2}.answer-char,.copy-char{position:absolute;top:4px;right:4px;bottom:4px;left:4px;z-index:1;display:grid;place-items:center;font-size:calc(var(--cell-size, 110px) * .564);line-height:1;font-family:STKaiti,Kaiti SC,KaiTi,serif;pointer-events:none;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}.answer-char{color:var(--ink)}.copy-char.sample{color:#111}.copy-char.trace{color:#d7d8de}.stroke-glyph{position:relative;z-index:1;width:100%;height:100%}.stroke-glyph path{fill:currentColor}.hand-canvas{position:absolute;top:0;right:0;bottom:0;left:0;z-index:2;width:100%;height:100%;touch-action:none;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;-webkit-tap-highlight-color:transparent}.writing-wrap{position:relative}.writing-wrap .writing-box{flex-shrink:0;margin:0}.check-now-icon{position:absolute;top:50%;right:-58px;z-index:6;transform:translateY(-50%);display:grid;place-items:center;width:44px;height:44px;border-radius:50%;color:#fff;background:var(--blue);font-family:STKaiti,Kaiti SC,KaiTi,serif;font-size:22px;font-weight:800;pointer-events:auto;box-shadow:0 3px 10px #1885ff59}.check-now-icon:disabled{opacity:.6}.preview-grid{display:flex;flex-wrap:wrap;align-items:flex-start;gap:34px 54px}.preview-word{--preview-char-size: 66px;width:max-content;text-align:center}.preview-pinyin{display:grid;grid-template-columns:repeat(var(--char-count),var(--preview-char-size));color:#333;font-size:20px;line-height:1.15;white-space:nowrap}.preview-text{display:grid;grid-template-columns:repeat(var(--char-count),var(--preview-char-size));margin-top:6px;font-size:54px;line-height:1;font-family:STKaiti,Kaiti SC,KaiTi,serif}.dim{color:#b7b7b7}.bottom-action{position:sticky;bottom:0;z-index:12;display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin:0 -28px;padding:18px 28px 24px;background:linear-gradient(#f6f6f700,#f6f6f7f5 24%)}.bottom-action .primary-outline,.bottom-action .primary-fill{width:auto;min-width:180px;max-width:280px;min-height:46px;border-radius:23px}.result-grid{grid-template-columns:repeat(3,minmax(260px,1fr));gap:46px 38px}.result-grid .word-cell{display:flex;flex-direction:column;align-items:center}.result-grid .pinyin-row{margin:0 auto 8px}.result-grid .writing-box{margin:0 auto}.mark{position:absolute;right:10px;bottom:8px;z-index:3;font-size:34px;font-weight:900}.mark.ok{color:var(--green)}.mark.bad{color:var(--red)}.mark.pending{color:var(--orange)}.feedback-controls{display:flex;gap:10px;justify-content:center;width:max(calc(var(--char-count) * 110px),170px);margin-top:12px}.score-row{margin-top:8px;color:#888;font-size:14px;text-align:center}.char-results{display:grid;grid-template-columns:repeat(var(--char-count),var(--cell-size, 110px));width:calc(var(--char-count) * var(--cell-size, 110px));margin:8px auto 0}.result-grid .char-results{margin-left:auto;margin-right:auto}.char-result-cell{padding:0 4px;display:flex;flex-direction:column;align-items:center;gap:4px;text-align:center}.char-result-cell .judge-line{font-size:14px;font-weight:650;color:#444}.char-result-cell .hint-tag{margin-left:0}.manual-mistake-btn{min-height:28px;margin-top:7px;padding:0 10px;border-radius:6px;color:#8a4b00;background:#fff6e5;font-size:13px}.manual-mistake-btn.added{color:var(--green);background:#eef7df;opacity:1}.char-detail-list{width:max(calc(var(--char-count) * var(--cell-size, 110px)),280px);max-width:100%;margin:10px auto 0;display:flex;flex-direction:column;gap:8px}.char-detail-item{display:flex;align-items:flex-start;gap:10px;padding:8px 10px;border-radius:10px;background:#faf7f4;text-align:left}.char-detail-item .detail-char{flex-shrink:0;width:32px;height:32px;display:grid;place-items:center;border-radius:8px;background:#fff;border:1px solid #e3ddd6;font-family:STKaiti,Kaiti SC,KaiTi,serif;font-size:20px;line-height:1;color:#333}.char-detail-item .detail-body{flex:1;min-width:0;display:flex;flex-direction:column;gap:6px}.char-detail-item .detail-actions{display:flex;flex-wrap:wrap;gap:8px}.mini-btn{min-height:30px;padding:0 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