@charset "UTF-8";
:root{--ink:#172c35;--muted:#6d7f85;--teal:#0b7972;--teal-dark:#075f5a;--teal-soft:#eaf5f1;--line:#e1e8e7;--canvas:#f5f7f7;--paper:#fff;--radius:16px;font-family:"Segoe UI","Microsoft YaHei","PingFang SC",sans-serif;color:var(--ink);font-synthesis:none;background:var(--canvas);font-size:14px;line-height:1.7}
*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}button,a{touch-action:manipulation}button{border:0}input,select,textarea{max-width:100%}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #6bb8b0;outline-offset:3px}h1,h2,h3,p{margin-top:0}h1{font-size:30px;line-height:1.4;letter-spacing:-.6px;margin-bottom:10px;font-weight:700}h2{font-size:19px;line-height:1.55;letter-spacing:-.25px}h3{font-size:16px;line-height:1.6}p{margin-bottom:0}h1:focus{outline:none}[hidden]{display:none!important}.muted{color:var(--muted)}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}.skip-link{position:fixed;left:16px;top:-80px;padding:10px 20px;background:var(--teal);color:#fff;z-index:99;border-radius:8px}.skip-link:focus{top:12px}
.sidebar{position:fixed;top:0;bottom:0;left:0;width:224px;background:var(--paper);border-right:1px solid var(--line);padding:34px 20px 22px;display:flex;flex-direction:column;z-index:30}.brand{display:flex;align-items:center;gap:11px;font-weight:750;font-size:17px;letter-spacing:.2px;margin:0 7px 35px}.brand-icon{width:39px;height:41px;display:grid;place-items:center;background:var(--teal);color:white;font-size:21px;border-radius:11px;box-shadow:0 4px 12px #0b79721c}.brand small{display:block;font-weight:400;font-size:11px;color:var(--muted);letter-spacing:1px;line-height:1.6;margin-top:2px}.nav-label{font-size:11px;color:#92a09e;padding:0 16px;margin-bottom:10px;letter-spacing:1px}nav{display:grid;gap:6px}nav a{display:flex;gap:12px;align-items:center;min-height:45px;padding:10px 15px;border-radius:9px;color:#64777c;font-weight:500}nav a>span:first-child{font-family:Arial,sans-serif;font-size:19px;width:19px;text-align:center;line-height:1}nav a:hover{background:#f4f7f6;color:var(--teal)}nav a.active{background:var(--teal-soft);color:var(--teal);font-weight:650}.nav-count{font-size:11px;padding:0 6px;border-radius:5px;background:#e3edeb;margin-left:auto;line-height:1.8}.sidebar-bottom{margin-top:auto;padding:24px 11px 0;font-size:11px;color:#8c9a9d}.sidebar-bottom p{line-height:1.9}.sidebar-bottom .text-button{display:block;font-size:12px;margin-top:10px}.sidebar-bottom small{display:block;margin-top:12px;font-size:10px;color:#9ba6a8}.import-label{cursor:pointer;color:var(--teal)}.import-label input{position:absolute;width:1px;height:1px;opacity:0}.import-label:focus-within{outline:3px solid #6bb8b0;outline-offset:3px}
.workspace{margin-left:224px;min-height:100vh}.topbar{height:78px;padding:0 42px;display:flex;align-items:center;justify-content:space-between;background:#ffffffd9;border-bottom:1px solid var(--line);gap:20px}.topbar-label{font-size:12px;color:#7d8d91;white-space:nowrap}.topbar-label span{margin:0 12px;color:#c8d1d1}.search-form{width:300px;display:flex;align-items:center;gap:8px;padding:7px 11px;background:#f6f8f8;border:1px solid #e9eeed;border-radius:8px}.search-form>span{font-size:24px;line-height:1;color:#8b9b9c}.search-form input{background:none;border:0;min-width:0;flex:1;font-size:12px;outline:none;padding:2px 0;color:var(--ink)}.search-form kbd{border:1px solid #dbe3e2;border-radius:4px;color:#a1adad;font-size:10px;padding:0 5px;background:white}.mobile-menu{display:none}main{max-width:1260px;padding:38px 44px 55px;margin:0 auto;min-height:calc(100vh - 150px);outline:none}.page-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:28px}.eyebrow{font-size:11px;font-weight:600;letter-spacing:1px;color:var(--teal);margin-bottom:9px}.page-description{color:var(--muted);font-size:13px;line-height:1.8;max-width:760px}.button{display:inline-flex;gap:12px;align-items:center;justify-content:center;border:1px solid transparent;padding:11px 19px;border-radius:8px;font-size:13px;font-weight:600;line-height:1.6;transition:background .18s,box-shadow .18s}.button.primary{background:var(--teal);color:#fff;box-shadow:0 4px 9px #0b79721a}.button.primary:hover{background:var(--teal-dark)}.button.secondary{background:#fff;border-color:#d9e3e0;color:#375550}.button.secondary:hover{background:#f3f8f6}.button.quiet{background:transparent;color:var(--teal);padding-left:8px;padding-right:8px}.button.quiet:hover{background:#ffffff80}.text-button{background:transparent;padding:0;color:var(--teal);font-size:12px;text-align:left}.text-button:hover{text-decoration:underline}.icon-button{padding:5px 9px;border-radius:7px;background:transparent;color:var(--ink);font-size:20px}
.hero-card{background:#eaf3ee;border:1px solid #ddeae1;border-radius:var(--radius);padding:31px 36px;display:flex;align-items:center;justify-content:space-between;gap:40px;position:relative;overflow:hidden;min-height:225px}.hero-content{z-index:1;max-width:660px}.hero-label{font-size:11px;color:#538174;display:flex;align-items:center;gap:7px;letter-spacing:.5px}.status-dot{width:6px;height:6px;border-radius:50%;background:#3b9b7e}.hero-content h2{font-size:25px;line-height:1.5;margin:12px 0 9px;letter-spacing:-.5px}.hero-content p{color:#6d8278;font-size:13px;max-width:570px}.hero-actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:23px}.progress-ring{width:150px;height:150px;flex:0 0 150px;border-radius:50%;background:conic-gradient(var(--teal) var(--progress),#d6e6dc 0);padding:7px;margin-right:10px;transform:rotate(-90deg)}.progress-ring>div{background:#eaf3ee;width:100%;height:100%;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-direction:column;transform:rotate(90deg)}.progress-ring strong{font-size:31px;line-height:1.4;font-weight:700}.progress-ring small{font-size:15px;font-weight:400;color:#82998b}.progress-ring span{font-size:11px;color:#6e887b;margin-top:5px}.stats-row{display:grid;grid-template-columns:repeat(3,1fr);background:white;border:1px solid var(--line);border-radius:12px;padding:19px 4px;margin:20px 0 36px}.stats-row>div{padding:0 26px;border-right:1px solid var(--line)}.stats-row>div:last-child{border:0}.stats-row>div>span{font-size:11px;color:var(--muted);display:block}.stats-row strong{font-size:25px;font-weight:650;line-height:1.5;display:block;margin-top:2px}.stats-row small{font-size:11px;color:#8c9a9c;font-weight:400}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:31px 0 17px}.section-heading h2{margin-bottom:3px}.section-heading p{font-size:12px;color:var(--muted)}.section-heading>a{font-size:12px;color:var(--teal);white-space:nowrap}.category-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:13px}.category-card{background:white;border:1px solid var(--line);padding:18px 17px 15px;border-radius:12px;transition:transform .18s,border-color .18s}.category-card:hover{transform:translateY(-3px);border-color:#a4c9be}.category-card>div:first-child{display:flex;justify-content:space-between;align-items:center;color:#b0bfbb;margin-bottom:16px}.category-number{color:var(--teal);font-family:Georgia,serif;font-size:23px}.category-card h3{font-size:14px;margin-bottom:7px}.category-card p{font-size:11px;color:#879693;line-height:1.8;min-height:60px}.category-progress{height:3px;background:#edf1f0;border-radius:3px;margin:18px 0 5px;overflow:hidden}.category-progress span{display:block;background:var(--teal);height:100%;min-width:0}.category-card small{font-size:10px;color:#9aa7a3}.category-rag .category-number{color:#8b7c3d}.category-agent .category-number{color:#4d7193}.category-training .category-number{color:#966650}.category-evaluation .category-number{color:#756b8e}
.question-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.question-card{background:white;border:1px solid var(--line);border-radius:12px;padding:20px 21px 15px;display:flex;flex-direction:column;transition:border-color .15s,box-shadow .15s;min-width:0}.question-card:hover{border-color:#a1c6bc;box-shadow:0 6px 20px #203d3310}.question-card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;gap:8px}.card-category{font-size:11px;color:#7f9690}.pill{font-size:10px;color:#508071;background:#eef6f0;padding:1px 7px;border-radius:4px;white-space:nowrap}.pill.advanced{color:#93753e;background:#faf3e6}.question-card h3{font-size:14px;line-height:1.8;margin-bottom:9px;display:flex;gap:9px;align-items:baseline}.question-card h3>span{font-size:11px;color:#a1aeab;font-weight:400;flex:0 0 auto}.question-card>p{font-size:11px;color:#889792;line-height:1.9;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:19px}.card-bottom{display:flex;justify-content:space-between;gap:8px;border-top:1px solid #eef2f0;padding-top:12px;font-size:10px;color:#9aa7a3;margin-top:auto}.card-bottom>span:last-child{color:#618c7f;white-space:nowrap}.card-bottom b{font-size:13px;font-weight:400}.study-method{display:flex;gap:17px;align-items:center;padding:22px 26px;background:#edf0ef;border-radius:12px;margin-top:32px}.method-icon{font-size:25px;color:#87a397}.study-method h2{font-size:13px;margin-bottom:5px}.study-method p{font-size:11px;line-height:2;color:#8a9993}.study-method b{font-weight:600;color:#60796e}.footer{display:flex;gap:24px;justify-content:space-between;max-width:1260px;margin:0 auto;padding:19px 44px;color:#a3afad;font-size:10px;border-top:1px solid #e5eae8}
.filter-row{display:flex;gap:8px;flex-wrap:wrap;margin:24px 0}.filter-chip{padding:7px 14px;background:white;border:1px solid #dce5e1;border-radius:7px;color:#6d827a;font-size:12px}.filter-chip.active{background:var(--teal);color:white;border-color:var(--teal)}.results-heading{display:flex;justify-content:space-between;align-items:center;color:#8b9a95;font-size:11px;margin-bottom:17px;gap:10px}.results-heading a{color:var(--teal)}.empty-state{text-align:center;padding:75px 24px;background:white;border:1px dashed #d5e1dc;border-radius:14px}.empty-state>span{font-size:35px;color:#b0c5bd;display:block;margin-bottom:12px}.empty-state h2{margin-bottom:8px}.empty-state p{color:var(--muted);font-size:13px;margin-bottom:23px}.breadcrumb{display:flex;justify-content:space-between;gap:15px;align-items:center;font-size:11px;color:#95a49d;margin-bottom:27px}.breadcrumb a{color:var(--teal)}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:28px;align-items:start}.lesson{padding:29px 32px;background:white;border:1px solid var(--line);border-radius:14px;min-width:0}.lesson h1{font-size:26px;line-height:1.6;margin-top:14px;margin-bottom:25px}.lesson-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;color:#97a49e;font-size:10px}.tag{border-left:1px solid #e6ece8;padding-left:9px}.recall-prompt{display:flex;gap:12px;background:#f6f8f6;border-radius:9px;padding:17px 18px;margin:0 0 17px}.recall-prompt>span{font-size:20px;color:#a1b7a5}.recall-prompt strong{font-size:12px;font-weight:600}.recall-prompt p{font-size:11px;color:#8b9b91;line-height:1.9;margin-top:3px}.reveal-button{margin-bottom:18px;font-size:12px}.short-answer{padding:20px 21px;background:#edf6f1;border-left:3px solid #8ab6a0;border-radius:0 9px 9px 0;margin:10px 0 27px}.short-answer h2{font-size:12px;color:var(--teal);margin-bottom:8px;letter-spacing:.3px}.short-answer p{font-size:13px;line-height:2;color:#3f6252}.lesson-section{margin:28px 0}.lesson-section h2{font-size:16px;margin-bottom:13px}.key-points{padding-left:21px;font-size:13px;color:#526b61;line-height:2.05}.key-points li{padding-left:5px;margin-bottom:12px}.key-points li::marker{color:#8aa799;font-size:11px}.formula-block{background:#202e35;color:#e5eeeb;border-radius:10px;padding:18px 21px;margin:25px 0}.formula-block>span{font-size:10px;color:#8db0a0}.formula-block pre{font-family:Consolas,"Microsoft YaHei",monospace;font-size:12px;line-height:1.9;white-space:pre-wrap;overflow-wrap:anywhere;margin:10px 0 1px}.example-block{background:#fbf7ed;border:1px solid #efe9d9;padding:20px 22px;border-radius:10px}.example-block h2{font-size:13px;color:#8b7846;margin-bottom:8px}.example-block p{font-size:12px;color:#8b846e;line-height:2}.pitfalls{padding-left:18px;color:#8e6b62;font-size:12px;line-height:2}.pitfalls li{margin-bottom:8px}.pitfalls li::marker{color:#c8a592}.follow-ups{padding-left:20px;font-size:12px;color:#6b7d73;line-height:2}.follow-ups li{margin-bottom:9px}.lesson-section>.muted{font-size:11px;margin-bottom:10px}textarea{width:100%;border:1px solid #dde7e0;background:#fcfdfc;border-radius:8px;padding:14px;resize:vertical;min-height:110px;font-size:12px;line-height:1.9;color:#496354}.note-status{display:block;color:#9bac9f;font-size:10px;margin-top:4px}.sources-section{border-top:1px solid #e5ece6;padding-top:23px}.sources-section ul{padding-left:18px;margin:0}.sources-section li{font-size:11px;margin-bottom:11px;color:#6b8b79}.sources-section a{color:var(--teal);overflow-wrap:anywhere}.sources-section small{display:block;color:#97a59c;font-size:10px;margin-top:2px}.lesson-next{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--line);margin-top:29px;padding-top:22px}.lesson-next>a{max-width:47%;display:flex;flex-direction:column;font-size:11px;color:#8c9d93}.lesson-next>a:last-child{text-align:right}.lesson-next b{font-weight:500;color:#5f8370;font-size:11px;line-height:1.8;margin-top:5px}.lesson-aside{position:sticky;top:24px}.self-assessment{border:1px solid var(--line);border-radius:12px;background:white;padding:22px 19px}.self-assessment h2{font-size:15px;margin:8px 0}.self-assessment p{font-size:11px;color:#91a196;line-height:1.9}.grade-buttons{display:grid;gap:8px;margin:19px 0 12px}.grade-button{display:flex;align-items:center;gap:12px;background:#f7f9f7;border:1px solid #e6ede7;border-radius:7px;padding:9px 12px;text-align:left;color:#698473;font-size:12px}.grade-button span{font-size:10px;border:1px solid #d5e0d8;line-height:17px;width:19px;text-align:center;border-radius:4px;color:#95a89a}.grade-button.selected{border-color:var(--teal);background:var(--teal-soft);color:var(--teal)}.grade-button:hover:not(:disabled){border-color:#96baa3}.self-assessment small{font-size:10px;color:#9eafa1;display:block;line-height:1.8}.bookmark-button{width:100%;margin:22px 0 13px;font-size:12px}.lesson-tip{padding:22px 10px;color:#95a69a}.lesson-tip h3{font-size:12px;margin-bottom:7px;color:#819c87}.lesson-tip p{font-size:11px;line-height:1.9}
.quiz-setup{max-width:620px;margin:35px auto;background:white;border:1px solid var(--line);border-radius:16px;padding:35px 45px;display:flex;flex-direction:column;align-items:stretch}.quiz-illustration{display:grid;place-items:center;width:60px;height:60px;border-radius:17px;background:#eef5ef;color:#85a78f;font:32px Georgia,serif;margin:0 auto 22px}.quiz-setup h2{text-align:center;font-size:20px;margin-bottom:10px}.quiz-setup>p{text-align:center;font-size:12px;color:var(--muted);line-height:1.9;margin-bottom:22px}.quiz-setup label{font-size:11px;color:#7b9483;margin:12px 0 6px}select{background:#f9fbf9;border:1px solid #dce6dd;border-radius:7px;padding:10px 13px;color:#577760;font-size:12px;min-height:41px}.quiz-setup>.button{margin-top:27px}.quiz-card{max-width:850px;margin:28px auto;background:white;border:1px solid var(--line);padding:29px 35px;border-radius:15px}.quiz-progress{height:3px;background:#edf2ee;border-radius:3px;margin-bottom:29px;overflow:hidden}.quiz-progress span{display:block;height:100%;background:var(--teal)}.quiz-card>h2{font-size:21px;line-height:1.8;margin:12px 0 25px}.quiz-options{border:0;padding:0;display:grid;gap:12px;margin:0}.quiz-option{display:flex;align-items:center;gap:13px;padding:15px 18px;border:1px solid #e1e8e3;border-radius:8px;cursor:pointer;position:relative;font-size:13px;line-height:1.9;color:#617a69}.quiz-option input{position:absolute;opacity:0}.quiz-option:focus-within{outline:3px solid #6bb8b0;outline-offset:3px}.quiz-option b{margin-left:auto}.option-letter{flex:0 0 26px;height:26px;display:grid;place-items:center;background:#f3f6f3;border-radius:6px;color:#8ba08f;font-size:11px}.quiz-option.chosen{border-color:#7da78b;background:#f5faf5}.quiz-option.right{background:#edf7f1;border-color:#70a386;color:#327452}.quiz-option.wrong{background:#fcf3ed;border-color:#d4a48e;color:#986c58}.quiz-explanation{padding:18px 21px;border-radius:9px;margin:22px 0;background:#f3f7f3}.quiz-explanation h3{font-size:13px;margin-bottom:7px;color:#4a825c}.quiz-explanation p{font-size:12px;line-height:2;color:#728d78}.quiz-explanation.retry{background:#fcf7ee}.quiz-explanation.retry h3{color:#9b7b4c}.quiz-explanation.retry p{color:#93866c}.quiz-explanation a{display:block;color:var(--teal);font-size:11px;margin-top:12px}.quiz-actions{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-top:27px;padding-top:22px;border-top:1px solid #e8ede8}.quiz-result{background:white;border:1px solid var(--line);padding:32px 36px;display:flex;align-items:center;gap:35px;border-radius:14px}.score-disc{width:135px;height:135px;flex:0 0 135px;border-radius:50%;background:#edf6ef;display:flex;justify-content:center;align-items:center;flex-direction:column;color:var(--teal)}.score-disc strong{font-size:37px;line-height:1.5}.score-disc small{font-size:16px;font-weight:400;color:#95ad9a}.score-disc>span{font-size:11px;color:#7d9d85}.quiz-result h2{margin-bottom:10px}.quiz-result p{font-size:12px;color:var(--muted)}.result-list{display:grid;gap:10px;margin-top:25px}.result-list>a{display:flex;align-items:center;gap:17px;background:white;border:1px solid var(--line);padding:15px 21px;border-radius:9px}.result-icon{width:30px;height:30px;display:grid;place-items:center;border-radius:50%;font-size:15px}.result-icon.correct{background:#eaf5ed;color:#5c966d}.result-icon.incorrect{background:#faf0e7;color:#bb997c}.result-list small{display:block;font-size:10px;color:#a2aea4}.result-list strong{font-size:12px;font-weight:500;line-height:1.8;color:#607e69}.result-list b{margin-left:auto;color:#a2b4a7;font-weight:400}.source-notice{background:#edf4ee;border:1px solid #dce7df;border-radius:12px;padding:22px 26px;margin-bottom:25px}.source-notice b{font-size:13px;color:#5f8468}.source-notice p{font-size:12px;color:#8a9e8f;line-height:2;margin-top:7px}.sources-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.source-card{background:white;border:1px solid var(--line);border-radius:11px;padding:22px 25px}.source-domain{font-size:10px;letter-spacing:.5px;color:#91a296;overflow-wrap:anywhere}.source-card h2{font-size:15px;line-height:1.8;margin:9px 0}.source-card h2 a{color:#477d5a}.source-card p{font-size:11px;color:#90a095;line-height:1.9}.source-card small{display:block;font-size:10px;color:#acb8ae;margin-top:16px}.toast{position:fixed;bottom:27px;left:calc(50% + 112px);transform:translateX(-50%);padding:12px 21px;border-radius:9px;background:#203a2f;color:#f1f7f2;box-shadow:0 8px 26px #152b2529;max-width:min(600px,calc(100vw - 35px));font-size:12px;z-index:70}.loading-state{display:flex;align-items:center;justify-content:center;gap:14px;min-height:60vh;color:var(--muted);font-size:13px}.loading-dot{width:9px;height:9px;background:var(--teal);border-radius:50%;animation:pulse 1.4s infinite}@keyframes pulse{50%{opacity:.2}}
@media(min-width:1550px){main{padding-top:44px}.hero-card{min-height:245px}.category-card{padding:20px}.category-card p{min-height:42px}.question-card{min-height:230px}}
@media(max-width:1220px){.sidebar{width:200px;padding-left:14px;padding-right:14px}.workspace{margin-left:200px}.topbar{padding:0 28px}main{padding:30px 28px 45px}.category-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.category-card p{min-height:39px}.question-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero-card{padding:26px;gap:25px}.hero-content h2{font-size:23px}.progress-ring{width:125px;height:125px;flex-basis:125px;margin-right:0}.lesson-layout{grid-template-columns:minmax(0,1fr) 200px;gap:18px}.lesson{padding:25px}.self-assessment{padding:20px 15px}.lesson h1{font-size:23px}.footer{padding-left:28px;padding-right:28px}.toast{left:calc(50% + 100px)}}
@media(max-width:980px){.lesson-layout{grid-template-columns:minmax(0,1fr)}.lesson-aside{position:static;display:grid;grid-template-columns:2fr 1fr;gap:20px}.grade-buttons{grid-template-columns:repeat(2,1fr)}.self-assessment .bookmark-button{margin-top:15px}.lesson-tip{padding-top:35px}.topbar-label{font-size:11px}.search-form{width:240px}.category-grid{gap:11px}.category-card{padding:16px}.stats-row>div{padding:0 18px}.stats-row strong{font-size:22px}.hero-content h2{font-size:21px}.progress-ring{width:108px;height:108px;flex-basis:108px}.progress-ring strong{font-size:26px}.hero-actions{gap:9px}.hero-card{gap:20px}.sources-grid{grid-template-columns:minmax(0,1fr)}}
@media(max-width:760px){.sidebar{transform:translateX(-100%);width:242px;transition:transform .2s}.sidebar.open{transform:translateX(0)}.workspace{margin-left:0}.mobile-menu{display:block}.topbar{height:66px;padding:0 17px;gap:12px}.topbar-label{display:none}.search-form{flex:1;max-width:360px;margin-left:auto}.mobile-shade{position:fixed;inset:0;z-index:25;background:#172c354d}.page-heading{margin-bottom:22px}h1{font-size:25px;letter-spacing:-.5px}main{padding:27px 19px 37px}.page-description{font-size:12px}.hero-card{padding:24px 22px;min-height:0;gap:16px}.hero-content h2{font-size:21px;margin-top:10px}.hero-content p{font-size:11px}.hero-label{font-size:10px}.hero-actions{margin-top:19px}.hero-actions .button{font-size:12px;padding:9px 13px}.hero-actions .quiet{padding-left:0;padding-right:0}.progress-ring{width:88px;height:88px;flex-basis:88px;padding:5px}.progress-ring strong{font-size:22px}.progress-ring small{font-size:11px}.progress-ring span{font-size:9px;margin-top:3px}.stats-row{padding:16px 0;margin-top:15px;margin-bottom:28px}.stats-row>div{padding:0 13px}.stats-row>div>span{font-size:9px}.stats-row strong{font-size:22px}.stats-row small{font-size:9px;display:block}.category-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.category-card{padding:17px}.category-card>div:first-child{margin-bottom:12px}.category-card p{min-height:38px}.category-grid .category-card:last-child{grid-column:1 / -1;display:grid;grid-template-columns:45px 1fr auto;column-gap:14px;align-items:center}.category-grid .category-card:last-child>div:first-child{grid-row:1 / 4;margin:0;display:block}.category-grid .category-card:last-child>div:first-child>span:last-child{display:none}.category-grid .category-card:last-child h3{grid-column:2;margin-bottom:3px}.category-grid .category-card:last-child p{grid-column:2;min-height:0}.category-grid .category-card:last-child .category-progress{grid-column:2;margin-top:10px}.category-grid .category-card:last-child small{grid-column:3;grid-row:1 / 4}.section-heading{margin-top:27px}.section-heading h2{font-size:17px}.section-heading p{font-size:11px}.section-heading>a{font-size:11px}.question-grid{gap:12px}.question-card{padding:18px 16px 13px}.question-card h3{font-size:13px;gap:6px}.question-card h3>span{font-size:10px}.question-card>p{font-size:10px;-webkit-line-clamp:3}.card-category{font-size:10px}.question-card-top{margin-bottom:13px}.card-bottom{font-size:9px;gap:4px;flex-wrap:wrap}.study-method{padding:18px;align-items:flex-start;gap:12px}.study-method p{font-size:10px}.footer{padding:17px 19px;gap:9px;flex-wrap:wrap;font-size:9px}.footer>span:last-child{width:100%}.toast{left:50%;bottom:18px;font-size:11px;width:max-content}.lesson{padding:23px 20px;border-radius:12px}.lesson h1{font-size:23px;margin:14px 0 22px}.lesson-meta{gap:8px}.lesson-layout{gap:18px}.lesson-aside{grid-template-columns:minmax(0,1fr)}.lesson-tip{padding:2px 12px 8px}.grade-buttons{grid-template-columns:repeat(2,1fr)}.self-assessment{padding:22px}.key-points{font-size:12px}.recall-prompt{padding:15px}.short-answer{padding:18px}.short-answer p{font-size:12px}.example-block{padding:18px}.breadcrumb{font-size:10px;margin-bottom:20px}.quiz-setup{padding:28px 24px;margin:25px auto}.quiz-setup h2{font-size:19px}.quiz-card{padding:23px 20px;margin-top:22px}.quiz-card>h2{font-size:18px}.quiz-option{padding:13px 12px;font-size:12px;gap:10px}.quiz-result{padding:25px 22px;gap:21px}.score-disc{width:95px;height:95px;flex-basis:95px}.score-disc strong{font-size:29px}.score-disc small{font-size:13px}.quiz-result h2{font-size:16px}.quiz-result p{font-size:11px}.quiz-result .hero-actions{gap:8px}.quiz-result .button{font-size:11px;padding:9px 12px}.result-list>a{padding:13px 15px;gap:12px}.source-card{padding:20px}.source-notice{padding:20px}}
@media(max-width:420px){main{padding-left:15px;padding-right:15px}.hero-card{padding:22px 18px}.hero-content h2{font-size:20px}.hero-card .progress-ring{display:none}.hero-content p{max-width:290px}.question-grid{grid-template-columns:minmax(0,1fr)}.question-card>p{font-size:11px;-webkit-line-clamp:2}.card-bottom{font-size:10px;flex-wrap:nowrap}.question-card h3{font-size:14px}.category-card h3{font-size:13px}.category-grid .category-card:last-child{column-gap:10px;grid-template-columns:34px 1fr}.category-grid .category-card:last-child small{grid-row:auto;grid-column:2}.stats-row>div{padding:0 10px}.quiz-result{align-items:flex-start;gap:16px}.score-disc{width:77px;height:77px;flex-basis:77px}.score-disc strong{font-size:25px}.score-disc>span{font-size:9px}.quiz-result .hero-actions{margin-top:15px}.lesson-next b{font-size:10px}.formula-block pre{font-size:11px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* 正文保持足够字号与对比度，辅助信息不挤占阅读空间。 */
.question-card>p{font-size:12px;color:#6d8177}.question-card h3{font-size:15px}.category-card p{font-size:12px;color:#70857a}.page-description{color:#627a71}.key-points{font-size:14px;color:#425f51}.short-answer p{font-size:14px}.example-block p,.pitfalls,.follow-ups{font-size:13px}.lesson-section>.muted,.recall-prompt p{font-size:12px;color:#6e8176}.source-card p{font-size:12px;color:#6e8275}.source-notice p{color:#69816f}.quiz-option{color:#4f6c58}.self-assessment p{color:#718a78}.quiz-explanation p{color:#5b7a63}.quiz-explanation.retry p{color:#7c715b}
@media(max-width:760px){.key-points,.short-answer p{font-size:13px}.question-card>p{font-size:12px}.category-card p{font-size:11px}.example-block p,.pitfalls,.follow-ups{font-size:12px}.question-card h3{font-size:14px}}
@media(max-width:760px){.sidebar{visibility:hidden}.sidebar.open{visibility:visible}}