:root{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:#172640;background:#f2f5fa;font-synthesis:none;font-size:16px;--blue:#315ed4;--ink:#172640;--muted:#63718a;--line:#dfe6f0;--green:#167451;--red:#b43c48;--radius:18px}
*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{color:inherit;cursor:pointer}button:disabled{cursor:not-allowed}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #7897ee;outline-offset:4px}button:disabled{opacity:.45}h1,h2,p{margin:0}h1{font-size:30px;line-height:1.5;letter-spacing:-.7px;font-weight:700}h2{font-size:21px;line-height:1.5;font-weight:650}p{line-height:1.8}strong{font-weight:650}svg{flex-shrink:0}.icon{width:22px;height:22px;vertical-align:middle}.quiet,.lead{color:var(--muted)}.lead{font-size:16px;line-height:1.85}.quiet{font-size:14px;line-height:1.7}.full{width:100%}.text-correct{color:var(--green)}.text-wrong{color:var(--red)}.skip-link{opacity:0;pointer-events:none;position:fixed;top:-60px;left:20px;background:white;padding:12px;z-index:100}.skip-link:focus{opacity:1;pointer-events:auto;top:10px}.boot-state{min-height:100svh;display:grid;place-content:center;gap:20px;text-align:center;color:var(--muted)}.loading-dot{width:16px;height:16px;border:3px solid #cdd7ef;border-top-color:var(--blue);border-radius:100%;margin:auto;animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
.button{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:48px;padding:12px 22px;border:1px solid transparent;border-radius:11px;line-height:1.5;font-size:15px;font-weight:600;transition:background .14s,color .14s;text-decoration:none!important}.button.primary{background:var(--blue);color:white;box-shadow:0 4px 10px #315ed414}.button.primary:hover:not(:disabled){background:#244cb8}.button.secondary{border-color:#d7dfed;background:white;color:#364866}.button.secondary:hover:not(:disabled){background:#edf2fb}.quiet-button{background:transparent;color:var(--muted);padding:8px 10px;min-height:42px}.quiet-button:hover{background:#e8eef8}.icon-button{border:0;background:transparent;padding:10px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center}.icon-button:hover{background:#eaf0f9}.pill{border:1px solid var(--line);padding:6px 12px;border-radius:99px;font-size:13px;white-space:nowrap;background:#fff}.brand{display:flex;align-items:center;gap:11px;font-size:21px;color:var(--ink);font-weight:700;line-height:1.3;text-decoration:none!important}.brand img{display:block;flex-shrink:0}.brand small{display:block;font-size:12px;font-weight:400;color:var(--muted);margin-top:5px}
.app-shell{max-width:1600px;margin:auto;min-height:100svh;display:grid;grid-template-columns:230px 1fr}.sidebar{position:sticky;top:0;height:100svh;padding:38px 22px 26px;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column}.sidebar .brand{margin:0 3px 50px}.sidebar nav{display:grid;gap:9px}.nav-link{display:flex;align-items:center;gap:13px;color:#5d6c85;font-size:15px;font-weight:550;border-radius:10px;padding:15px 17px;text-decoration:none!important}.nav-link:hover{background:#f2f5fa}.nav-link.active{background:#eaf0ff;color:#244fbd}.nav-count{margin-left:auto;background:#f3e6e9;color:var(--red);font-size:11px;min-width:22px;text-align:center;padding:2px 6px;border-radius:20px}.sidebar-bottom{margin-top:auto;display:flex;align-items:flex-start;gap:12px;color:#8b97ab;font-size:12px;padding:20px 7px 0;border-top:1px solid #edf1f7;line-height:1.9}.sidebar-bottom .icon{margin-top:4px;width:18px}.sidebar-bottom strong{font-weight:400;color:#63718a}.main-column{min-width:0}.page{max-width:1060px;margin:0 auto;padding:46px 50px 50px;outline:none}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:28px}.page-heading .quiet{margin-bottom:6px}.page-heading .lead{margin-top:8px}.mobile-header,.bottom-nav{display:none}.local-tag{display:flex;gap:5px;align-items:center;font-size:11px;color:var(--muted)}.local-tag .icon{width:14px;height:14px}
.continue-panel{background:white;display:flex;align-items:center;justify-content:space-between;gap:42px;padding:32px 34px;border-radius:20px;border:1px solid #dce5f3;box-shadow:0 5px 20px #3c548407;position:relative;overflow:hidden}.continue-panel:before{content:"";position:absolute;left:0;top:32px;bottom:32px;width:4px;background:var(--blue);border-radius:0 4px 4px 0}.eyebrow{color:var(--blue);font-size:13px;font-weight:600;display:block;margin-bottom:10px}.continue-text{max-width:440px}.continue-text h2{font-size:25px;line-height:1.6}.continue-text>p{color:var(--muted);font-size:14px;margin:10px 0 22px}.continue-text .button{min-width:174px}.study-total{width:188px;flex-shrink:0;align-self:center;padding-left:28px;border-left:1px solid var(--line)}.study-total>span{font-size:13px;color:var(--muted)}.study-total>p{margin:8px 0 12px;white-space:nowrap;line-height:1.2}.study-total strong{font-size:42px;letter-spacing:-1px;font-weight:650}.study-total p>span{font-size:16px;color:#8a95a8}.study-total small{font-size:12px;color:var(--muted);display:block;margin-top:8px}progress{width:100%;height:5px;border:none;display:block;border-radius:9px;background:#e8edf6;overflow:hidden;appearance:none}progress::-webkit-progress-bar{background:#e8edf6;border-radius:9px}progress::-webkit-progress-value{background:var(--blue);border-radius:9px}progress::-moz-progress-bar{background:var(--blue);border-radius:9px}
.home-shortcuts{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:19px 0 34px}.shortcut{display:flex;align-items:center;gap:14px;text-align:left;border:0;background:#e8edf6;border-radius:13px;padding:18px 20px;min-height:86px}.shortcut:hover{background:#e0e8f5}.shortcut>span{flex:1}.shortcut strong{font-size:16px;display:block}.shortcut small{display:block;color:var(--muted);font-size:12px;line-height:1.6;margin-top:5px}.shortcut>.icon:first-child{width:25px;height:25px;color:#4e6b9b}.shortcut>.icon:last-child{width:17px;height:17px;color:#8190aa}.section-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.section-heading a{font-size:13px;display:flex;align-items:center;color:var(--muted);gap:3px}.section-heading .icon{width:14px}.chapter-list{background:#fff;border:1px solid var(--line);border-radius:15px;overflow:hidden}.chapter-row{display:flex;align-items:center;width:100%;border:0;background:transparent;text-align:left;gap:20px;padding:22px 25px;min-height:96px}.chapter-row+.chapter-row{border-top:1px solid #eaf0f7}.chapter-row:hover{background:#f7f9fe}.chapter-number{font-size:20px;font-variant-numeric:tabular-nums;color:#9cabc2;font-weight:500}.chapter-main{flex:1;min-width:0}.chapter-main>strong{display:block;font-size:16px;line-height:1.7}.chapter-caption{display:flex;gap:18px;color:#8491a6;font-size:12px;margin:7px 0 9px}.chapter-main progress{height:3px;max-width:250px}.chapter-row>.icon{width:16px;color:#9aa8bb}.save-notice{display:flex;gap:12px;margin-top:28px;align-items:flex-start;color:#63718a}.save-notice>.icon{width:18px;height:18px;margin-top:4px}.save-notice>div{flex:1}.save-notice strong{font-size:13px}.save-notice p{font-size:12px;margin-top:4px}.save-notice .icon-button{padding:4px;color:#8b98ab}.save-notice .icon-button .icon{width:17px;height:17px}.all-questions{margin-top:20px}.page-note{font-size:12px;color:#7e8ba1;margin-top:20px;text-align:center}
.practice-page{max-width:920px;padding-top:24px;padding-bottom:132px}.practice-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:21px}.back-link{display:inline-flex;align-items:center;gap:7px;color:var(--muted);font-size:14px}.back-link>.icon{width:17px}.practice-progress{display:grid;grid-template-columns:1fr auto;gap:12px 20px;color:var(--muted);margin-bottom:25px;font-size:14px;line-height:1.6}.practice-progress>span{max-width:550px}.practice-progress>strong{color:var(--ink);font-size:17px;white-space:nowrap}.practice-progress>strong>span{color:#8995a9;font-size:13px;font-weight:400}.practice-progress progress{grid-column:1/-1;height:4px}.question-paper{background:white;border-radius:18px;border:1px solid #e1e7f0;padding:30px 34px}.question-meta{display:flex;align-items:center;flex-wrap:wrap;gap:11px;font-size:12px;color:#8692a5;margin-bottom:18px}.type-badge{background:#eaf0ff;color:var(--blue);padding:4px 9px;border-radius:5px;font-weight:600}.review-badge{background:#fff5df;color:#90651a;padding:3px 7px;border-radius:5px;font-size:11px}.question-paper h1{font-size:22px;line-height:1.9;letter-spacing:0;white-space:pre-line;overflow-wrap:anywhere}.question-hint{font-size:13px;color:#8390a5;margin:14px 0 23px;line-height:1.7}.options{padding:0;margin:0;border:0;display:grid;gap:12px;min-width:0}.option{position:relative;display:flex;align-items:flex-start;gap:14px;border:1.5px solid #e0e6f0;border-radius:11px;padding:17px 18px;background:#fff;cursor:pointer;min-height:61px;transition:background .1s,border-color .1s}.option:hover{background:#f7f9fe;border-color:#beccea}.option input{position:absolute;opacity:0;width:1px;height:1px;top:20px;left:12px}.option:has(input:focus-visible){outline:3px solid #7897ee;outline-offset:3px}.option-key{display:flex;align-items:center;justify-content:center;width:26px;height:26px;flex-shrink:0;background:#f0f3f8;border-radius:7px;color:#71809a;font-size:14px;font-weight:600;margin-top:1px}.option-text{font-size:17px;line-height:1.8;flex:1;white-space:pre-line;overflow-wrap:anywhere}.option-mark{min-width:18px;align-self:center;display:flex}.option-mark .icon{width:19px;height:19px}.option.selected{background:#eff4ff;border-color:#6587e7}.option.selected .option-key{background:var(--blue);color:white}.options:disabled .option{cursor:default;opacity:1}.option.correct-option{background:#eef9f4;border-color:#80baa0;color:#175b42}.option.correct-option .option-key{background:#237c58;color:white}.option.correct-option .option-mark{color:var(--green)}.option.wrong-option{background:#fff1f2;border-color:#d69aa2;color:#8e2d3c}.option.wrong-option .option-key{background:var(--red);color:white}.option.wrong-option .option-mark{color:var(--red)}.practice-actions{position:fixed;bottom:0;left:230px;right:0;padding:18px max(30px,calc((100vw - 230px - 820px)/2)) calc(18px + env(safe-area-inset-bottom));display:flex;justify-content:space-between;align-items:center;gap:16px;background:#f2f5faf5;border-top:1px solid #dfe6f0;z-index:10;backdrop-filter:blur(8px)}.save-label{display:flex;align-items:center;gap:5px;color:#789287;font-size:12px;white-space:nowrap}.save-label .icon{width:15px;height:15px}.action-buttons{display:flex;gap:12px}.action-buttons .primary{min-width:170px}.feedback{margin-top:27px;padding:22px;border-radius:11px}.correct-feedback{background:#edf8f2;color:#1d6447}.wrong-feedback{background:#fff0f2;color:#9a3442}.feedback-title{display:flex;align-items:center;gap:9px;outline:none}.feedback-title h2{font-size:17px}.feedback-title>.icon{width:21px;height:21px}.answer-comparison{display:flex;gap:36px;margin-top:13px}.answer-comparison p{font-size:13px;color:#637480}.answer-comparison strong{font-size:17px;color:inherit;margin-left:10px}.result-note{font-size:12px;margin-top:12px;line-height:1.8}.explanation{padding-top:25px}.explanation>h2{font-size:17px;margin-bottom:12px}.explanation>p{font-size:16px;line-height:1.95;color:#485976;white-space:pre-line}.source-details{border-top:1px solid #e9edf4;margin-top:22px;padding-top:14px;font-size:12px;color:var(--muted)}summary{cursor:pointer;line-height:1.7}.source-details p{font-size:12px;margin:10px 0}.source-details ul{padding-left:19px;margin:0}.source-details li{padding:5px 0}.source-details a{line-height:1.7}.source-details .icon{width:12px;height:12px}.retry-question{border:0;background:transparent;color:var(--blue);font-size:13px;padding:12px 0;margin-top:9px}.retry-question:hover{text-decoration:underline}.review-note{display:flex;align-items:flex-start;gap:9px;padding:15px 16px;border-radius:9px;background:#fff8e9;color:#806025;margin-top:18px}.review-note>.icon{width:17px;height:17px;margin-top:3px}.review-note strong{font-size:13px}.review-note p{font-size:13px;line-height:1.8;margin-top:5px;white-space:pre-line}
.tabs{display:flex;gap:5px;padding:5px;background:#e7edf6;border-radius:12px;margin-bottom:22px;width:fit-content;max-width:100%}.tab{border:0;background:transparent;border-radius:8px;min-height:42px;padding:8px 17px;color:#718099;font-size:14px}.tab.active{background:white;color:var(--blue);box-shadow:0 1px 4px #223f7010}.tab span{font-size:12px;margin-left:7px;font-variant-numeric:tabular-nums}.filter-label{display:flex;gap:12px;align-items:center;font-size:13px;color:var(--muted);margin-bottom:20px}.filter-label select{max-width:320px;width:auto;padding:9px 33px 9px 12px;background:white;border:1px solid var(--line);border-radius:8px;font-size:13px;color:var(--ink)}.mistake-list{border-radius:14px;background:white;border:1px solid var(--line);overflow:hidden}.mistake-row{display:grid;grid-template-columns:1fr 20px;gap:10px;width:100%;text-align:left;padding:23px 25px;border:0;background:transparent}.mistake-row+.mistake-row{border-top:1px solid var(--line)}.mistake-row:hover{background:#f9fbff}.mistake-meta{display:flex;flex-wrap:wrap;gap:13px;font-size:12px;color:#7a89a2;grid-column:1}.mistake-row>strong{font-size:16px;line-height:1.85;grid-column:1;white-space:pre-line}.mistake-row>.quiet{font-size:12px;grid-column:1}.mistake-row>.icon{grid-column:2;grid-row:1/4;align-self:center;width:16px;color:#9aa8bb}.empty-state{display:flex;flex-direction:column;align-items:center;text-align:center;padding:65px 25px;background:#fff;border:1px solid var(--line);border-radius:16px;gap:14px}.empty-state>.icon{width:40px;height:40px;color:#9fb0ce;margin-bottom:6px}.empty-state h2{font-size:20px}.empty-state p{font-size:14px;color:var(--muted);max-width:360px}.empty-state .button{margin-top:10px}.record-summary{display:grid;grid-template-columns:repeat(3,1fr);background:#fff;border:1px solid var(--line);border-radius:16px;padding:27px 18px;margin-bottom:28px}.record-summary>div{display:flex;flex-direction:column;gap:8px;text-align:center}.record-summary>div+div{border-left:1px solid var(--line)}.record-summary strong{font-size:32px}.record-summary span{color:var(--muted);font-size:13px}.record-section{background:#fff;border:1px solid var(--line);border-radius:14px;padding:25px 27px;margin-bottom:20px}.record-section h2{font-size:18px;margin-bottom:13px}.record-section>p{font-size:14px;color:#65748c;line-height:1.9}.record-section>p+p{margin-top:15px}.detail-list{margin:17px 0 0;font-size:13px}.detail-list div{display:flex;gap:20px;justify-content:space-between;padding:11px 0;border-top:1px solid #edf1f7}.detail-list dt{color:#8b97aa}.detail-list dd{margin:0;text-align:right}.button-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}.button-row .button{font-size:13px;min-height:43px}.button-row .icon{width:18px;height:18px}.completion{background:white;border:1px solid var(--line);border-radius:22px;padding:50px 25px;text-align:center}.completion-symbol{display:inline-flex;align-items:center;justify-content:center;width:68px;height:68px;background:#e9f4ef;color:var(--green);border-radius:50%;margin-bottom:25px}.completion-symbol .icon{width:35px;height:35px}.completion h1{margin:8px 0 12px;font-size:27px}.completion-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:30px auto;max-width:520px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:25px 0}.completion-stats>div{display:grid;gap:12px}.completion-stats strong{font-size:30px}.completion-stats small{font-size:16px;color:var(--muted);font-weight:400}.completion-stats span{font-size:12px;color:var(--muted)}.completion-buttons{display:grid;gap:12px;max-width:300px;margin:auto}.completion-buttons>a:last-child{font-size:13px;margin-top:10px}
dialog{padding:25px 26px 28px;border:1px solid #dfe6f0;border-radius:18px;background:white;box-shadow:0 20px 70px #182c5b29;max-width:min(560px,calc(100vw - 32px));width:100%;max-height:85svh;color:var(--ink)}dialog::backdrop{background:#15253b55;backdrop-filter:blur(3px)}.dialog-header{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;margin-bottom:17px}.dialog-header h2{font-size:20px;padding-top:4px}.dialog-header .icon-button{margin:-4px -6px 0 0;color:#73829c}.choice-fieldset{padding:0;border:0;margin:24px 0}.choice-fieldset legend{font-size:13px;margin-bottom:11px;color:var(--muted)}.segmented{display:flex;gap:8px}.segmented label{position:relative;flex:1;min-width:0;cursor:pointer}.segmented input{position:absolute;width:1px;height:1px;opacity:0}.segmented span{display:block;text-align:center;font-size:14px;background:#f3f5f9;border:1px solid #e5eaf3;border-radius:8px;padding:12px 5px}.segmented input:checked+span{background:#edf2ff;color:var(--blue);border-color:#7897e9}.segmented input:focus-visible+span{outline:3px solid #7897ee;outline-offset:3px}.dialog-note{font-size:12px;color:#8491a7;margin-bottom:19px}.card-legend{display:flex;gap:7px;align-items:center;font-size:12px;color:var(--muted);margin:16px 0}.legend-dot{width:10px;height:10px;border:1px solid #d3dce9;border-radius:3px;margin-left:8px}.legend-dot:first-child{margin-left:0}.legend-dot.correct{background:#cce8da;border-color:#82b99f}.legend-dot.wrong{background:#f5d8de;border-color:#d494a1}.answer-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:9px;margin:20px 0 3px}.grid-question{border:1px solid #dfe6f0;background:#f5f7fb;border-radius:8px;min-height:43px;font-size:14px}.grid-question.correct{background:#e5f4eb;border-color:#c2e2d0;color:var(--green)}.grid-question.wrong{background:#fce7ec;border-color:#edc2cb;color:var(--red)}.grid-question.current{outline:2px solid var(--blue);outline-offset:1px}.storage-warning{display:flex;align-items:flex-start;gap:10px;padding:13px 22px;background:#fff4da;color:#7d5d22;font-size:12px;line-height:1.7}.storage-warning>.icon{width:17px;height:17px;flex-shrink:0;margin-top:2px}.storage-warning>a{white-space:nowrap;margin-left:auto}.toast{position:fixed;left:50%;bottom:105px;transform:translate(-50%,12px);background:#172640;color:white;font-size:13px;line-height:1.7;max-width:min(460px,calc(100vw - 36px));padding:12px 20px;border-radius:10px;box-shadow:0 5px 20px #17264022;opacity:0;visibility:hidden;transition:opacity .2s,transform .2s;z-index:100;text-align:center;width:max-content}.toast.visible{opacity:1;visibility:visible;transform:translate(-50%,0)}
.activation-page{min-height:100svh;padding:42px 24px 32px;display:flex;align-items:center;flex-direction:column;background:linear-gradient(180deg,#eaf0fb 0,#f4f7fc 62%)}.activation-page>.brand{align-self:flex-start;margin:0 0 45px max(0px,calc((100vw - 1200px)/2))}.activation-card{width:min(100%,448px);padding:38px 35px 28px;background:#fff;border:1px solid #dce5f4;border-radius:22px;box-shadow:0 12px 36px #27497e09}.key-symbol{display:inline-flex;align-items:center;justify-content:center;width:52px;height:52px;border-radius:15px;background:#eaf0ff;color:var(--blue);margin-bottom:23px}.key-symbol .icon{width:27px;height:27px}.activation-card h1{font-size:28px;letter-spacing:-.4px}.activation-card>.lead{font-size:14px;margin-top:10px;margin-bottom:29px}.field-label{display:block;color:#596981;font-size:13px;font-weight:600;margin-bottom:9px}#activation-code{width:100%;border:1px solid #cfd9e9;background:#fafcff;padding:14px 14px;border-radius:9px;min-height:51px;font-size:15px;letter-spacing:.3px;color:var(--ink);margin-bottom:16px}#activation-code::placeholder{color:#9aa8bb;letter-spacing:0}.activation-notes{border-top:1px solid #e9eef6;padding-top:19px;margin-top:27px;display:grid;gap:10px;color:#7a89a0;font-size:12px}.activation-notes p{display:flex;gap:9px;align-items:center}.activation-notes .icon{width:16px;height:16px}.activation-footnote{font-size:12px;text-align:center;max-width:420px;color:#8491a6;line-height:1.9;margin-top:25px}.form-error{color:var(--red);font-size:13px;line-height:1.8;margin:12px 0}.form-error[hidden]{display:none}
@media(min-width:1600px){.practice-actions{left:calc((100vw - 1600px)/2 + 230px);right:calc((100vw - 1600px)/2);padding-left:160px;padding-right:160px}}
@media(max-width:1100px){.app-shell{grid-template-columns:200px 1fr}.sidebar{padding:32px 16px}.sidebar .brand{font-size:19px}.page{padding-left:30px;padding-right:30px}.continue-panel{padding:27px;gap:25px}.continue-text h2{font-size:22px}.study-total{width:150px;padding-left:23px}.practice-actions{left:200px;padding-left:30px;padding-right:30px}.shortcut{padding:17px 14px;gap:10px}.shortcut small{font-size:11px}}
@media(max-width:760px){:root{font-size:15px}.app-shell{display:block}.sidebar{display:none}.mobile-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;background:#fff;border-bottom:1px solid #e8edf5}.mobile-header .brand{font-size:17px;gap:9px}.page{padding:27px 20px calc(100px + env(safe-area-inset-bottom))}.page-heading{gap:10px;margin-bottom:22px;align-items:flex-start}.page-heading h1{font-size:25px;letter-spacing:-.5px}.page-heading .quiet{font-size:12px;margin-bottom:5px}.page-heading .pill{display:none}.page-heading .lead{font-size:14px}.continue-panel{padding:24px;gap:20px;align-items:flex-start;border-radius:17px;display:block}.continue-panel:before{top:26px;bottom:26px}.continue-text h2{font-size:22px;line-height:1.6}.continue-text>p{font-size:12px;margin:11px 0 18px}.continue-text .button{width:100%;font-size:15px}.eyebrow{font-size:12px;margin-bottom:9px}.study-total{border:0;border-top:1px solid #e7edf6;width:100%;padding:19px 0 0;margin-top:21px;display:grid;grid-template-columns:1fr auto;gap:9px;align-items:center}.study-total>span{font-size:12px}.study-total>p{margin:0;font-size:14px;grid-row:1;grid-column:2}.study-total strong{font-size:23px;letter-spacing:0}.study-total p>span{font-size:12px}.study-total progress{grid-column:1/-1;height:4px}.study-total small{display:none}.home-shortcuts{gap:10px;margin:14px 0 28px}.shortcut{padding:17px 14px;gap:11px;min-height:95px;align-items:flex-start}.shortcut>.icon:first-child{width:21px;height:21px;margin-top:2px}.shortcut>.icon:last-child{display:none}.shortcut strong{font-size:14px}.shortcut small{font-size:11px;line-height:1.7}.section-heading{margin-bottom:13px}.section-heading h2{font-size:18px}.section-heading a{font-size:12px}.chapter-row{padding:19px 17px;gap:16px;min-height:94px}.chapter-number{font-size:18px}.chapter-main>strong{font-size:15px}.chapter-caption{font-size:11px;gap:14px;margin:6px 0 9px}.chapter-main progress{max-width:none}.chapter-row>.icon{width:14px}.bottom-nav{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;background:#fffffff7;border-top:1px solid #e0e7f2;padding:8px 8px calc(8px + env(safe-area-inset-bottom));z-index:10;backdrop-filter:blur(8px)}.bottom-nav .nav-link{padding:5px 2px;font-size:10px;gap:5px;display:flex;flex-direction:column;border-radius:8px;position:relative}.bottom-nav .nav-link.active{background:transparent;color:var(--blue)}.bottom-nav .nav-link>.icon{width:22px;height:22px}.bottom-nav .nav-count{position:absolute;right:16px;top:1px;padding:1px 4px;font-size:9px;min-width:15px}.save-notice{margin-top:22px}.save-notice .icon-button{margin-right:-5px}.save-notice strong{font-size:12px}.save-notice p{font-size:11px}.practice-page{padding:15px 16px calc(133px + env(safe-area-inset-bottom))}.practicing .mobile-header{display:none}.practice-top{margin-bottom:17px}.back-link{font-size:13px}.quiet-button{font-size:13px}.practice-progress{font-size:12px;gap:10px;margin:0 4px 17px}.practice-progress>span{line-height:1.6;padding-right:5px}.practice-progress>strong{font-size:16px}.question-paper{padding:22px 19px;border-radius:14px}.question-meta{font-size:11px;gap:8px;margin-bottom:17px}.type-badge{padding:4px 8px}.question-paper h1{font-size:20px;line-height:1.85}.question-hint{font-size:12px;margin:13px 0 21px}.option{padding:15px 13px;gap:11px;min-height:62px;border-radius:10px}.option-text{font-size:16px;line-height:1.85}.option-key{width:25px;height:25px;font-size:13px;margin-top:2px}.option-mark{min-width:15px}.option-mark .icon{width:17px;height:17px}.options{gap:11px}.practice-actions{left:0;right:0;padding:10px 18px calc(12px + env(safe-area-inset-bottom));flex-direction:column;gap:8px;align-items:stretch}.save-label{justify-content:center;font-size:10px;gap:4px}.save-label .icon{width:12px;height:12px}.action-buttons{width:100%;gap:11px}.action-buttons .button{font-size:14px;min-height:47px}.action-buttons .primary{flex:1;min-width:0}.previous{padding-left:14px;padding-right:14px}.previous .icon{width:16px}.feedback{padding:18px 15px;margin-top:22px}.feedback-title h2{font-size:15px}.feedback-title>.icon{width:19px;height:19px}.answer-comparison{gap:24px}.answer-comparison p{font-size:12px}.answer-comparison strong{font-size:16px;margin-left:6px}.explanation{padding-top:22px}.explanation>h2{font-size:16px}.explanation>p{font-size:15px;line-height:1.95}.review-note{padding:13px 12px;gap:8px}.review-note p{font-size:12px}.review-note strong{font-size:12px}.review-note>.icon{width:15px;height:15px}.tabs{width:100%;gap:1px;padding:4px}.tab{flex:1;min-height:41px;padding:8px 5px;font-size:12px;white-space:nowrap}.tab span{margin-left:5px;font-size:11px}.page-heading>.button{font-size:12px;padding:9px 12px;min-height:42px;white-space:nowrap;margin-top:14px}.page-heading>.button .icon{display:none}.filter-label{font-size:12px;gap:10px}.filter-label select{max-width:calc(100% - 45px);font-size:12px}.mistake-row{padding:19px 17px}.mistake-meta{font-size:11px;gap:9px}.mistake-row>strong{font-size:15px}.mistake-row>.quiet{font-size:11px}.record-summary{padding:22px 10px;margin-bottom:20px}.record-summary strong{font-size:27px}.record-summary span{font-size:11px}.record-section{padding:22px 20px;margin-bottom:16px}.record-section h2{font-size:17px}.record-section>p{font-size:13px}.detail-list{font-size:12px}.button-row{gap:9px}.button-row .button{padding:10px 12px;font-size:12px}.completion{padding:35px 19px}.completion h1{font-size:23px}.completion>.lead{font-size:13px}.completion-stats{gap:5px}.completion-stats strong{font-size:25px}.completion-stats small{font-size:13px}.completion-stats span{font-size:11px}.completion-symbol{width:58px;height:58px}.completion-symbol .icon{width:30px;height:30px}.storage-warning{padding:10px 16px;font-size:11px;flex-wrap:wrap;gap:7px}.storage-warning>span{flex:1}.storage-warning>a{margin-left:24px}.activation-page{padding:24px 22px 30px;justify-content:flex-start}.activation-page>.brand{margin:0 0 40px;align-self:flex-start;font-size:19px}.activation-card{padding:29px 24px 24px;border-radius:19px}.activation-card h1{font-size:25px}.activation-card>.lead{font-size:13px;margin-bottom:25px}.activation-footnote{font-size:11px;margin-top:22px}.key-symbol{width:46px;height:46px;margin-bottom:19px}.key-symbol .icon{width:25px;height:25px}.activation-notes{font-size:11px}dialog{padding:23px 20px;border-radius:16px;max-height:83svh}.dialog-header h2{font-size:18px}.answer-grid{gap:8px;grid-template-columns:repeat(6,1fr)}.grid-question{min-height:42px;font-size:13px}.toast{bottom:105px;font-size:12px;padding:11px 16px}}
@media(max-width:360px){.page{padding-left:15px;padding-right:15px}.practice-page{padding-left:11px;padding-right:11px}.question-paper{padding:20px 16px}.question-paper h1{font-size:19px}.option{padding:14px 10px;gap:9px}.option-text{font-size:15px}.home-shortcuts{gap:8px}.shortcut{padding:15px 11px;gap:8px}.shortcut>.icon:first-child{display:none}.chapter-row{gap:12px;padding:18px 14px}.chapter-main>strong{font-size:14px}.activation-card{padding:25px 20px}.answer-grid{grid-template-columns:repeat(5,1fr)}.study-total strong{font-size:21px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}