:root{--navy:#082b5e;--blue:#1747f5;--green:#0ccf67;--ink:#13243d;--muted:#647289;--line:#e2e9f2;--soft:#f4f7fb}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:Arial,Helvetica,sans-serif;background:#fff}button,a{font:inherit}button{cursor:pointer}.app-header{height:88px;padding:0 max(22px,calc((100% - 1320px)/2));display:flex;align-items:center;gap:38px;border-bottom:1px solid var(--line);position:sticky;top:0;background:#fff;z-index:20}.logo img{width:175px;height:74px;object-fit:contain}.app-header nav{display:flex;gap:30px;margin:auto}.app-header nav a{text-decoration:none;color:#4c5a70;font-size:14px;font-weight:800}.btn{border:0;border-radius:13px;padding:14px 22px;text-decoration:none;font-weight:900;text-align:center}.btn-primary{background:linear-gradient(135deg,var(--blue),#0879ff);color:#fff;box-shadow:0 9px 23px #1747f52b}.btn-outline{background:#fff;color:var(--navy);border:1px solid #c8d4e4}.btn-large{min-height:56px;display:inline-grid;place-items:center}.hero{min-height:610px;padding:70px max(22px,calc((100% - 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.subject{text-decoration:none;color:inherit}.course-link{width:100%;min-height:50px;border:1px solid #c7d5e7;background:#fff;color:var(--blue);border-radius:12px;font-weight:900;text-decoration:none;display:grid;place-items:center}.content-page{min-height:calc(100vh - 88px);background:#f6f8fc}.content-hero{padding:65px max(22px,calc((100% - 1200px)/2)) 45px;background:linear-gradient(140deg,#082b5e,#0c56b2);color:#fff}.content-hero>span,.course-detail-hero>div>span{font-size:11px;letter-spacing:1.6px;color:#8fc5ff;font-weight:900}.content-hero h1,.course-detail-hero h1{font-size:48px;margin:10px 0}.content-hero p,.course-detail-hero p{font-size:17px;line-height:1.65;color:#c8d8eb;max-width:720px}.section.compact{padding-top:42px}.content-footer{padding:35px max(22px,calc((100% - 1200px)/2));display:flex;align-items:center;gap:25px;border-top:1px solid var(--line);background:#fff}.content-footer img{width:130px;height:70px;object-fit:contain}.content-footer p{font-size:11px;color:var(--muted);max-width:600px}.content-footer a{margin-left:auto;color:var(--blue);font-weight:900;text-decoration:none}.course-detail-hero{padding:55px max(22px,calc((100% - 1200px)/2));background:linear-gradient(140deg,#082b5e,#0d61c4);display:flex;align-items:center;gap:28px;color:#fff}.course-big-icon{width:100px;height:100px;flex:0 0 100px;background:#ffffff1c;border:1px solid #ffffff2f;border-radius:25px;display:grid;place-items:center;font-size:48px}.lesson-layout{max-width:1200px;margin:35px auto;padding:0 22px 70px;display:grid;grid-template-columns:285px 1fr;gap:25px}.lesson-layout aside{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;align-self:start;position:sticky;top:110px}.lesson-layout aside h3{margin-top:0}.lesson-layout aside a{display:flex;align-items:center;gap:10px;text-decoration:none;color:#526076;font-size:12px;font-weight:800;padding:12px 0;border-bottom:1px solid var(--line)}.lesson-layout aside a b{width:30px;height:30px;border-radius:9px;background:#edf3ff;color:var(--blue);display:grid;place-items:center}.lesson-layout aside .lesson-test{margin-top:12px;color:#087c46;border:0}.lesson-list{display:grid;gap:18px}.lesson-list>article{background:#fff;border:1px solid var(--line);border-radius:19px;padding:30px;scroll-margin-top:110px}.lesson-list>article>span{font-size:10px;color:var(--blue);font-weight:900}.lesson-list h2{font-size:27px;color:var(--navy)}.lesson-list>article>p{font-size:15px;color:#506078;line-height:1.8}.lesson-tip{background:#edf8f2;border-left:4px solid var(--green);padding:17px 20px;border-radius:10px;margin-top:22px}.lesson-tip p{font-size:12px;color:#507061;margin-bottom:0;line-height:1.6}.matter-page-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.matter-page-grid article{background:#fff;border:1px solid var(--line);border-radius:20px;padding:25px}.matter-page-grid i{font-style:normal;font-size:31px;width:60px;height:60px;background:#edf3ff;border-radius:16px;display:grid;place-items:center}.matter-page-grid h2{font-size:20px;color:var(--navy)}.matter-page-grid p,.matter-page-grid li{font-size:12px;color:var(--muted);line-height:1.6}.matter-page-grid ul{padding-left:18px}.matter-page-grid a{color:var(--blue);font-size:12px;font-weight:900;text-decoration:none}.topic-content,.exercise-box{max-width:900px;margin:35px auto;padding:35px;background:#fff;border:1px solid var(--line);border-radius:21px}.topic-content>article{display:flex;gap:17px;padding:20px 0;border-bottom:1px solid var(--line)}.topic-content>article>b{width:42px;height:42px;flex:0 0 42px;background:var(--blue);color:#fff;border-radius:12px;display:grid;place-items:center}.topic-content h3{margin:0}.topic-content p{font-size:13px;color:var(--muted);line-height:1.7}.sign-category{margin-bottom:42px}.sign-category>p{color:var(--muted)}.exercise-box>span{font-size:11px;color:var(--blue);font-weight:900;letter-spacing:1.5px}.exercise-box h1{font-size:36px;color:var(--navy)}.exercise-box fieldset{border:1px solid var(--line);border-radius:16px;padding:22px;margin:18px 0}.exercise-box legend{font-weight:900;padding:0 8px}.exercise-box label{display:block;padding:13px;border:1px solid var(--line);border-radius:10px;margin:9px 0;color:#526077}.exercise-box input{margin-right:10px}.exercise-result{margin-top:20px;padding:20px;background:#edf9f2;border-radius:13px;color:#087a45}.training-sign{display:grid;place-items:center;padding:35px}.training-sign .sign{transform:scale(1.45);margin:20px}.exercise-box form>.btn{margin-top:12px}
@media(max-width:900px){.matter-page-grid{grid-template-columns:1fr 1fr}.lesson-layout{grid-template-columns:1fr}.lesson-layout aside{position:static}.content-footer{padding-bottom:90px}}
@media(max-width:600px){.hero{min-height:auto;padding-top:32px}.hero h1{font-size:42px}.hero-copy>p{font-size:16px}.hero-actions,.facts{flex-direction:column}.facts{gap:8px}.hero-card{padding:20px}.section{padding:48px 18px}.section-title h2{font-size:31px}.mode-grid,.subject-grid,.sign-grid,.course-grid,.matter-page-grid{grid-template-columns:1fr}.mode-card{min-height:190px}.subject{min-height:105px}.quiz-header{height:72px;padding:0 12px;gap:8px}.quiz-header>button{width:38px;height:38px}.quiz-header img{width:75px;height:55px}.quiz-header>div strong{font-size:13px}.quiz-header>div small{display:none}.quiz-header>span{padding:7px 9px}.quiz-header b{font-size:16px}.question-card{padding:24px 16px 105px}.question-card h1{font-size:23px}.answers button{min-height:74px;padding:13px;font-size:15px}.quiz-actions{position:fixed;left:0;right:0;bottom:0;background:#fff;padding:10px 13px;gap:8px;border-top:1px solid var(--line);z-index:30}.quiz-actions>button{width:42%}.quiz-actions .btn{width:58%;min-width:0;padding:10px}.result-card{margin:20px 12px;padding:30px 16px}.result-card .btn{width:100%;margin-top:8px}.content-hero{padding:42px 18px 32px}.content-hero h1,.course-detail-hero h1{font-size:34px}.course-detail-hero{padding:35px 18px;align-items:flex-start}.course-big-icon{width:70px;height:70px;flex-basis:70px;font-size:33px}.course-detail-hero p{font-size:13px}.lesson-layout{padding:0 12px 90px}.lesson-list>article{padding:22px}.lesson-list h2{font-size:23px}.topic-content,.exercise-box{margin:16px 12px;padding:23px}.exercise-box h1{font-size:29px}.content-footer{display:block;text-align:center}.content-footer a{display:block;margin-top:15px}}