:root{--font-sans:"Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;--background:#fff;--foreground:#192c48;--green:#175cde;--brand-blue:#175cde;--brand-yellow:#ffda74;--surface-blue:#eff5ff;--muted:#67758a;--border:#e3e8ef;--paper:#fff;--accent:#d65a1c}*{box-sizing:border-box}html{scroll-padding-top:24px}body{background:var(--background);color:var(--foreground);font-family:var(--font-sans);margin:0;font-size:16px;line-height:1.7}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}a,button{touch-action:manipulation;-webkit-tap-highlight-color:transparent}:focus-visible{outline:3px solid var(--accent);outline-offset:4px}.wrap{width:min(1200px,100% - 80px);margin-inline:auto}.site-header{z-index:20;background:#fffffff7;border-bottom:1px solid #e9eef8;position:relative}.header-inner{align-items:center;gap:24px;min-height:96px;display:flex}.brand{white-space:nowrap;letter-spacing:-.5px;align-items:center;gap:12px;font-size:29px;font-weight:850;display:inline-flex}.brand b{letter-spacing:0;color:var(--brand-blue);vertical-align:middle;margin-left:2px;font-size:14px;font-weight:800}.brand-icon{color:#fff;background:var(--brand-blue);border-radius:16px 16px 6px;flex-shrink:0;place-items:center;width:48px;height:48px;display:grid;position:relative;box-shadow:0 5px 12px #175cde20}.desktop-nav{background:#f2f6fd;border:1px solid #e9eff8;border-radius:100px;align-items:center;gap:5px;margin:auto;padding:5px;display:flex}.desktop-nav a{color:#536780;white-space:nowrap;border:0;border-radius:100px;justify-content:center;align-items:center;min-height:44px;padding:8px 17px;font-size:14px;font-weight:550;display:flex}.desktop-nav a[aria-current]{color:#fff;background:var(--brand-blue);border:0;font-weight:700;box-shadow:0 3px 8px #175cde28}.desktop-nav a:hover,.text-link:hover,.site-footer a:hover{color:var(--accent)}.login-link{background:var(--brand-blue);color:#fff;white-space:nowrap;border-radius:100px;align-items:center;gap:10px;min-height:48px;padding:7px 8px 7px 17px;font-size:14px;font-weight:650;display:flex;box-shadow:0 4px #1044a5}.menu-button{width:44px;min-height:44px;color:var(--brand-blue);background:var(--surface-blue);border:1px solid #dce7f8;border-radius:14px;justify-content:center;align-items:center;padding:8px;display:none}.mobile-nav{gap:8px;padding:8px 0 20px;display:grid}.mobile-nav a{background:#f5f8fe;border-radius:14px;justify-content:space-between;align-items:center;min-height:64px;padding:13px 16px;display:flex}h1,h2,h3,p{overflow-wrap:break-word}h2{letter-spacing:-.5px;margin:0;font-size:28px;font-weight:750;line-height:1.5}.button{border-radius:100px;justify-content:center;align-items:center;gap:22px;min-height:52px;padding:12px 23px;font-size:15px;font-weight:700;display:inline-flex}.primary{background:var(--brand-blue);color:#fff;box-shadow:0 4px #1044a5}.primary:hover,.login-link:hover{background:#15365f}.text-link{min-height:44px;color:var(--brand-blue);background:#fff;border:1px solid #dfe8f6;border-radius:100px;align-items:center;gap:12px;padding:6px 14px;font-size:14px;font-weight:650;display:inline-flex}.home-catalog{padding-top:48px}.home-heading{justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px;display:flex}.home-heading p{color:var(--muted);margin:7px 0 0;font-size:14px}.catalog-controls{border:0;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:20px;padding-block:8px;display:flex}.grade-options{background:#f0f4fb;border:1px solid #e7edf8;border-radius:100px;flex-wrap:wrap;gap:8px;padding:6px;display:flex}.grade-options button{color:#586b84;background:0 0;border:0;border-radius:100px;min-height:44px;padding:9px 20px;font-size:14px}.grade-options button:first-child{padding:9px 20px}.grade-options button[aria-pressed=true]{color:#19355a;background:var(--brand-yellow);border:0;font-weight:750;box-shadow:0 2px 5px #253d6710}.grade-options button:hover{color:var(--green)}.catalog-selection{align-items:center;gap:14px;margin:22px 0 18px;font-size:14px;font-weight:600;display:flex}.catalog-selection span{color:var(--muted);font-size:12px;font-weight:400}.photo-course-grid{grid-template-columns:repeat(3,1fr);gap:27px;display:grid}.photo-course{background:#fff;border:1px solid #e4ebf5;border-radius:20px;min-width:0;padding:9px;display:block;box-shadow:0 5px 18px #1d427b06}.course-photo{aspect-ratio:1.95;background:#e9edf2;border-radius:13px;position:relative;overflow:hidden}.course-photo img{object-fit:cover}.course-photo-reading img{object-position:50% 64%}.course-photo-library img{object-position:50% 62%}.course-photo-label{color:#263c58;background:#ffffffed;border-radius:3px;padding:3px 9px;font-size:11px;position:absolute;top:14px;left:14px}.course-open{color:#1b375c;background:var(--brand-yellow);border:1px solid #ffffffc0;border-radius:50%;place-items:center;width:42px;height:42px;display:grid;position:absolute;bottom:13px;right:13px;box-shadow:0 3px 10px #10294322}.photo-course:hover .course-open{background:var(--green)}.photo-course:hover h3{color:var(--green)}.course-caption{padding:15px 10px 13px}.course-caption-top{color:#5c708e;justify-content:space-between;gap:8px;font-size:12px;display:flex}.course-caption-top span:last-child{color:#78808b;font-size:11px}.course-caption h3{margin:7px 0 4px;font-size:19px;font-weight:700}.course-caption p{color:var(--muted);margin:0;font-size:12px}.prototype-note{color:var(--muted);margin:22px 0 0;font-size:12px}.science-section{background:#eff5ff;border:1px solid #e3ecfb;border-radius:24px;grid-template-columns:47% 53%;margin-top:55px;display:grid;overflow:hidden}.science-photo{min-height:320px;position:relative}.science-photo img{object-fit:cover}.science-content{padding:33px 42px}.science-tag{color:#5b7295;font-size:12px}.science-content h2{margin:9px 0 13px;font-size:28px;line-height:1.55}.science-content p{color:var(--muted);margin:0 0 24px;font-size:13px;line-height:1.9}.science-links{flex-wrap:wrap;gap:12px;display:flex}.science-links a{min-height:46px;color:var(--brand-blue);background:#fff;border:1px solid #d7e3f6;border-radius:100px;justify-content:space-between;align-items:center;gap:20px;padding:8px 17px;font-size:14px;font-weight:600;display:flex}.science-links a:hover{border-color:#7892b9}.home-shortcuts{border-bottom:1px solid var(--border);grid-template-columns:1.8fr 1fr 1fr;align-items:center;gap:36px;margin-top:50px;padding-block:15px 42px;display:grid}.home-shortcuts h2{font-size:22px}.home-shortcuts p{color:var(--muted);margin:8px 0;font-size:13px}.home-shortcuts a{background:#f4f8ff;border:1px solid #e3ebf8;border-radius:18px;grid-template-columns:1fr 35px;align-content:center;column-gap:10px;min-height:100px;padding:18px 22px;display:grid}.home-shortcuts strong{font-size:16px;font-weight:650}.home-shortcuts a>span:last-child{color:var(--muted);font-size:12px}.shortcut-icon{background:var(--brand-yellow);color:#19355a;border-radius:50%;grid-area:1/2/3;align-self:center;place-items:center;width:36px;height:36px;font-size:23px;display:grid}.site-footer{justify-content:space-between;gap:30px;padding-block:38px;display:flex}.site-footer strong{font-size:22px}.site-footer p{color:var(--muted);margin:7px 0;font-size:13px}.site-footer small{color:var(--muted);font-size:11px}.site-footer nav{align-items:flex-start;gap:28px;display:flex}.site-footer a{min-height:44px;padding-top:6px;font-size:13px}.section{padding-block:45px 20px}.eyebrow{color:var(--green);margin:0 0 12px;font-size:13px}.intro{color:var(--muted);margin:0 0 26px;font-size:15px;line-height:1.9}.page-title,.placeholder h1{letter-spacing:-1px;margin:10px 0 20px;font-size:38px;font-weight:750;line-height:1.4}.page-intro{max-width:680px;margin-bottom:30px}.placeholder{max-width:860px;min-height:65vh;padding-bottom:40px}.placeholder .status{margin-top:24px;display:table}.badge{border:1px solid var(--border);color:#526886;border-radius:4px;padding:2px 8px;font-size:12px;display:inline-block}.placeholder-panel{border:1px solid var(--border);background:#f7f9fc;border-radius:8px;margin:26px 0;padding:28px}.placeholder-panel h2{margin-bottom:15px;font-size:21px}.placeholder-panel p,.placeholder-panel li{color:var(--muted)}.placeholder-panel ul{padding-left:22px;list-style:outside}.placeholder-panel li{margin-block:10px}.muted{color:var(--muted);font-size:14px}.detail-eyebrow{margin-top:25px}.search-label{align-items:center;gap:12px;padding-bottom:8px;font-size:13px;display:flex}.search-label input{background:#f7f9fe;border:1px solid #dce5f3;border-radius:100px;width:180px;min-height:46px;padding:9px 17px}.empty-state{border:1px dashed var(--border);text-align:center;color:var(--muted);padding:40px}.skip-link{z-index:50;background:#fff;padding:10px;position:fixed;top:-100px;left:20px}.skip-link:focus{top:10px}@media (width<=1050px){.wrap{width:calc(100% - 48px)}.header-inner,.desktop-nav{gap:20px}.login-link{padding-inline:13px}.photo-course-grid{gap:18px}.course-caption h3{font-size:17px}.science-content{padding:28px}.science-content h2{font-size:24px}.home-shortcuts{gap:22px}.home-shortcuts h2{font-size:20px}}@media (width<=760px){.wrap{width:calc(100% - 36px)}.header-inner{justify-content:space-between;min-height:74px}.brand{font-size:23px}.desktop-nav,.login-link{display:none}.menu-button{display:block}.home-catalog{padding-top:30px}.home-heading{align-items:flex-start;gap:10px}.home-heading h2{font-size:23px}.home-heading p{font-size:12px}.home-heading .text-link{white-space:nowrap;font-size:12px}.grade-options{grid-template-columns:repeat(6,minmax(0,1fr));column-gap:0;width:100%;display:grid}.grade-options button{min-height:48px;padding:9px 2px;font-size:13px}.grade-options button:first-child{padding:9px 2px}.photo-course-grid{grid-template-columns:1fr;gap:24px}.course-photo{aspect-ratio:1.9}.course-caption h3{font-size:20px}.course-caption p{font-size:13px}.prototype-note{line-height:1.8}.science-section{grid-template-columns:1fr;margin-top:35px}.science-photo{min-height:235px}.science-content{padding:26px}.science-content h2{font-size:25px}.science-content p br{display:none}.home-shortcuts{grid-template-columns:1fr 1fr;gap:22px;margin-top:30px;padding-bottom:30px}.home-shortcuts>div{grid-column:1/-1}.home-shortcuts a{padding-left:17px}.home-shortcuts h2{font-size:21px}.site-footer{flex-direction:column;gap:15px}.site-footer nav{flex-wrap:wrap;gap:24px}.page-title,.placeholder h1{font-size:31px}.placeholder-panel{padding:22px}.section{padding-top:30px}.search-label{padding-top:8px}}@media (width>=601px) and (width<=760px){.photo-course-grid{grid-template-columns:repeat(2,1fr)}}@media (prefers-reduced-motion:no-preference){a,button{transition:background-color .15s,color .15s,border-color .15s}.course-photo img{transition:transform .25s}.photo-course:hover .course-photo img{transform:scale(1.035)}}.campaign-hero{isolation:isolate;color:#fff;background:#145bd5;width:100%;max-width:1920px;min-height:550px;margin-inline:auto;position:relative;overflow:hidden}.campaign-inner{width:min(1200px,100% - 80px);margin-inline:auto;padding-block:66px 56px}.campaign-hero:after{content:"";z-index:-1;pointer-events:none;background:linear-gradient(90deg,#082b77a3,#082b772e 48%,#0000 70%);position:absolute;inset:0}.campaign-hero .hero-content{z-index:1;width:min(560px,50%);padding:0;position:relative}.campaign-hero .hero-category{color:#e4efff;margin:0 0 23px;font-size:14px;font-weight:550}.campaign-hero h1{letter-spacing:-1.8px;color:#fff;margin:0 0 22px;font-size:clamp(42px,4.3vw,62px);font-weight:800;line-height:1.3}.campaign-hero .hero-description{color:#e4efff;margin:0 0 28px;font-size:15px;line-height:1.9}.campaign-art{z-index:-2;width:100%;max-width:1440px;margin:0 auto;position:absolute;inset:0}.campaign-art img{object-fit:cover;object-position:60% 35%}.campaign-actions{flex-wrap:wrap;align-items:center;gap:24px;display:flex}.campaign-cta{background:var(--brand-yellow);color:#182e53;border:1px solid #ffe9af;border-radius:100px;min-height:58px;font-size:16px;box-shadow:0 5px #c9993b}.campaign-cta:hover{background:#ffe6a5}.campaign-learn{color:#fff;background:#ffffff0d;border:1px solid #ffffff80;border-radius:100px;justify-content:center;align-items:center;gap:18px;min-height:54px;padding:11px 21px;font-size:14px;font-weight:600;text-decoration:none;display:inline-flex}.campaign-stage{color:#e1edff;margin:22px 0 0;font-size:12px}.campaign-highlights{border-bottom:1px solid var(--border);color:var(--muted);grid-template-columns:repeat(3,1fr);gap:20px;padding-block:27px;font-size:12px;display:grid}.campaign-highlights b{color:var(--foreground);margin-right:13px;font-size:15px;font-weight:700}.campaign-highlights>:not(:first-child){border-left:1px solid var(--border);padding-left:30px}@media (width<=1050px){.campaign-inner{width:calc(100% - 48px);padding-block:55px 45px}.campaign-hero .hero-content{width:53%;padding:0}.campaign-hero h1{font-size:46px}.campaign-hero{min-height:510px}.campaign-highlights b{margin:0 0 4px;display:block}}@media (width<=760px){.campaign-inner{width:100%;padding:28px 23px 0}.campaign-hero{min-height:655px}.campaign-hero .hero-content{width:100%;max-width:none;padding:0}.campaign-hero .hero-category{margin-bottom:16px;font-size:12px}.campaign-hero h1{letter-spacing:-1.2px;margin-bottom:15px;font-size:38px;line-height:1.3}.campaign-hero .hero-description{margin-bottom:19px;font-size:13px;line-height:1.8}.campaign-actions{gap:20px}.campaign-cta{gap:20px;min-height:48px;padding:10px 18px;font-size:14px}.campaign-learn{font-size:13px}.campaign-stage{margin-top:14px;font-size:11px}.campaign-art{height:345px;inset:auto 0 0}.campaign-art img{object-position:85% 55%}.campaign-hero:after{background:linear-gradient(#145bd5 0% 44%,#145bd5a6 52%,#0000 66%)}.campaign-highlights{gap:10px;padding-block:20px;font-size:10px}.campaign-highlights b{font-size:12px}.campaign-highlights>:not(:first-child){padding-left:12px}}.brand-wordmark{flex-direction:column;line-height:1.2;display:flex}.brand-wordmark small{letter-spacing:1px;color:#71839d;margin-top:6px;font-size:10px;font-weight:500}.brand-spark{background:var(--brand-yellow);border:2px solid #fff;border-radius:4px;width:13px;height:13px;position:absolute;top:-3px;right:-3px;transform:rotate(12deg)}.header-actions{align-items:center;gap:10px;display:flex}.login-arrow{background:#ffffff24;border-radius:50%;place-items:center;width:32px;height:32px;display:grid}.login-label-mobile{display:none}.desktop-nav a:hover:not([aria-current]){color:var(--brand-blue);background:#e5edfc}.desktop-nav a[aria-current]:hover{color:#fff}.mobile-nav strong{font-size:15px;font-weight:700;display:block}.mobile-nav small{color:#6d7f99;margin-top:3px;font-size:11px;display:block}.mobile-nav a[aria-current]{color:var(--brand-blue);background:#eaf1ff}.mobile-nav a>svg{color:var(--brand-blue)}.campaign-cta>svg{width:21px;height:21px}.campaign-learn:hover{background:#ffffff24}.grade-options button:hover:not([aria-pressed=true]){background:#e3ebfa}.photo-course:hover{border-color:#b9cdf2;box-shadow:0 10px 24px #1b4e9f12}.photo-course:hover .course-open{color:#fff}.science-links a:hover,.text-link:hover{color:var(--brand-blue);background:#edf4ff;border-color:#a5c0f0}.home-shortcuts a:hover{background:#eaf2ff;border-color:#bdd0f1}.button:active,.login-link:active{transform:translateY(2px);box-shadow:0 1px #1044a5}.campaign-cta:active{box-shadow:0 2px #c9993b}@media (width<=1050px){.header-inner{gap:16px;min-height:86px}.desktop-nav{display:none}.header-actions{margin-left:auto}.menu-button{display:flex}.brand{font-size:27px}.brand-icon{width:44px;height:44px}}@media (width<=760px){.header-inner{gap:8px;min-height:78px}.brand{gap:9px;font-size:24px}.brand-icon{border-radius:13px 13px 5px;width:40px;height:40px}.brand b{font-size:12px}.brand-wordmark small{letter-spacing:.5px;margin-top:4px;font-size:9px}.header-actions{gap:8px}.login-link{gap:6px;min-height:44px;padding:8px 13px;font-size:12px;display:flex;box-shadow:0 3px #1044a5}.login-label-desktop,.login-arrow{display:none}.login-label-mobile{display:inline}.login-link>svg{width:15px;height:15px}.menu-button{border-radius:13px;width:44px;min-height:44px;display:flex}.campaign-actions{gap:11px}.campaign-cta{gap:15px;min-height:50px;padding:10px 18px;font-size:14px}.campaign-learn{gap:10px;min-height:48px;padding:10px 14px;font-size:13px}.grade-options{border-radius:17px;gap:3px;padding:5px}.grade-options button,.grade-options button:first-child{min-height:44px;padding:8px 1px;font-size:12px}.home-shortcuts a{border-radius:15px;min-height:92px;padding:15px 12px}.home-shortcuts strong{font-size:14px}.home-shortcuts a>span:last-child{font-size:11px}.home-catalog{padding-top:33px}}@media (prefers-reduced-motion:no-preference){.button,.login-link,.photo-course{transition:transform .18s,box-shadow .18s,background-color .18s,border-color .18s}.button:hover,.login-link:hover{transform:translateY(-1px)}.button:active,.login-link:active{transform:translateY(2px)}.photo-course:hover{transform:translateY(-3px)}}.search-label .subject-search{background:#f7f9fe;border-radius:100px;width:180px}.search-label .subject-search input{background:0 0;border:0;border-radius:0;width:100%;min-height:0;padding:0}button.ant-btn.menu-button{box-shadow:none;padding:8px}.visual-catalog>.ant-alert{margin-top:14px}.auth-layout{grid-template-columns:1fr 1fr;align-items:start;gap:70px;padding-block:48px 60px;display:grid}.auth-intro{padding:20px 24px 20px 0}.auth-intro h1{margin:10px 0 20px;font-size:40px;font-weight:750;line-height:1.5}.auth-intro p:not(.eyebrow){color:var(--muted);line-height:1.9}.auth-intro img{object-fit:cover;object-position:center 65%;border-radius:20px;width:100%;height:220px;margin:28px 0 20px;display:block}.auth-intro small{color:var(--muted);font-size:12px}.auth-form-card{background:#fff;border:1px solid #e1eaf8;border-radius:24px;padding:30px 34px;box-shadow:0 12px 36px #1b427b08}.auth-form-card h2{font-size:27px}.auth-form-card .ant-alert{margin-bottom:18px}.auth-form-card .ant-form-item{margin-bottom:19px}.auth-form-card .ant-input-affix-wrapper,.auth-form-card .ant-select-selector{min-height:44px}.auth-footnote{color:var(--muted);margin-top:20px;font-size:12px;line-height:1.8}.recovery-code{word-break:break-all;background:#f1f6ff;border-radius:12px;margin-top:18px;padding:18px;font-family:monospace}.account-page{min-height:65vh;padding-block:40px 50px}.account-heading{justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px;display:flex}.account-heading h1{margin:4px 0;font-size:34px;font-weight:750}.account-heading .eyebrow{margin-bottom:5px}.account-page>.ant-alert{margin-bottom:20px}.settings-form{max-width:460px}.account-loading{min-height:60vh;padding:80px 30px}@media (width<=760px){.auth-layout{grid-template-columns:1fr;gap:25px;padding-block:25px 35px}.auth-intro{padding:0}.auth-intro h1{margin:6px 0 12px;font-size:29px}.auth-intro img{display:none}.auth-intro p:not(.eyebrow){font-size:13px}.auth-form-card{border-radius:18px;padding:23px 20px}.auth-form-card h2{font-size:24px}.account-heading{flex-direction:column;align-items:flex-start}.account-heading h1{font-size:28px}.account-page{padding-top:25px}.account-page .ant-card-body{padding:18px}}.published-section{margin-top:48px}.learning-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;margin:24px 0;display:grid}.learning-grid>a{color:inherit;min-width:0}.learning-grid p{overflow-wrap:anywhere}.course-heading{max-width:850px;padding:40px 0}.course-heading h1{font-size:clamp(30px,4vw,48px)}.course-heading .ant-btn{margin:20px 0 0 12px}.lesson-chapter{margin:20px 0}.lesson-chapter li{padding:10px 0}.lesson-layout{grid-template-columns:260px minmax(0,1fr);align-items:start;gap:28px;margin-top:28px;display:grid}.lesson-layout aside{background:#eef4ff;border-radius:16px;padding:20px}.lesson-nav{color:#26496f;overflow-wrap:anywhere;border-radius:8px;margin:4px 0;padding:10px 12px;display:block}.lesson-nav[aria-current=page]{color:#fff;background:#214f8b}.lesson-prose{white-space:pre-wrap;overflow-wrap:anywhere;padding:22px 0;font-size:17px;line-height:1.95}.lesson-actions{flex-wrap:wrap;align-items:center;gap:18px;margin-top:28px;display:flex}.editor-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:0 22px;display:grid}.course-editor{margin:32px 0}.course-editor .ant-form{margin-top:24px}.lesson-editor{border-top:1px solid #dee6f2;margin:12px 0;padding:24px 0}@media (width<=800px){.learning-grid,.lesson-layout,.editor-grid{grid-template-columns:1fr}.lesson-layout .ant-card-body{padding:18px}}.practice-page{padding-block:36px 72px}.practice-banner{background:#edf4ff;border-radius:24px;grid-template-columns:1.2fr 1fr;margin-bottom:30px;display:grid;overflow:hidden}.practice-banner>div{padding:36px 42px}.practice-banner h1{margin:12px 0;font-size:clamp(30px,3.4vw,44px);line-height:1.35}.practice-banner img{object-fit:cover;width:100%;height:100%;max-height:330px}.practice-toolbar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-block:24px;display:flex}.practice-toolbar .ant-select{min-width:130px}.question-card{background:#fff;border:1px solid #dfe7f2;border-radius:16px;margin:22px 0;padding:30px 36px}.question-meta{color:#60718a;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;display:flex}.question-card h2{margin:20px 0;font-size:22px;line-height:1.7}.question-text{white-space:pre-wrap;overflow-wrap:anywhere}.question-options{gap:12px;width:100%;display:grid}.question-review-checks{gap:16px;margin:20px 0;display:grid}.question-review-navigation{justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px;display:flex}.admin-question-search{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:24px 0;display:grid}.admin-question-search label{gap:8px;display:grid}.admin-question-search .ant-input-affix-wrapper,.admin-question-search .ant-btn{min-height:44px}.admin-question-filter-summary .ant-tag{white-space:normal;overflow-wrap:anywhere;max-width:100%}@media (width<=640px){.admin-question-search{grid-template-columns:1fr}}.question-review-checks .ant-checkbox-wrapper{align-items:center;min-height:44px}.question-options .ant-radio-wrapper{white-space:pre-wrap;overflow-wrap:anywhere;background:#f6f8fc;border-radius:10px;align-items:flex-start;margin:0;padding:16px;display:flex}.question-options .ant-radio-wrapper-checked{background:#eaf1ff;outline:1px solid #175cde}.question-options .ant-radio-label{gap:14px;min-width:0;display:flex}.question-options strong{color:#214f8b}.question-options .ant-radio-wrapper-disabled,.question-options .ant-radio-disabled+span{color:#394b62}.question-submit{flex-wrap:wrap;align-items:center;gap:20px;margin-top:24px;display:flex}.answer-result{border-left:4px solid;border-radius:6px;margin:24px 0;padding:20px 24px}.answer-result h3,.answer-result h4{margin:0 0 8px}.answer-correct{background:#edf8f3;border-color:#278361}.answer-wrong{background:#fff6e5;border-color:#d69b23}.history-options li{overflow-wrap:anywhere;padding:8px}@media (width<=700px){.practice-banner{grid-template-columns:1fr}.practice-banner>div{padding:24px}.practice-banner img{height:160px}.question-card{padding:22px 18px}.question-card h2{font-size:19px}.answer-result{padding:18px 14px}}.lesson-video video{background:#101c2d;border-radius:12px;width:100%;max-height:540px;display:block}.media-upload-label{border:1px dashed #175cde;border-radius:12px;padding:16px;font-weight:600;display:block}.media-upload-label input{max-width:100%;margin-top:12px;display:block}.ai-page .ant-card{margin-top:24px}.question-diagram{background:#f6f9ff;border-radius:12px;margin:20px 0;padding:12px}.question-diagram img{width:100%;max-width:560px;height:auto;margin:auto;display:block}.question-diagram figcaption{color:#60718a;text-align:center;overflow-wrap:anywhere;margin-top:8px;font-size:14px}.diagram-editor>.ant-select{min-width:180px;margin-bottom:20px}.diagram-editor label{margin-bottom:16px;display:block}.relation-form-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;display:grid}.relation-prose{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.9}.relation-pagination,.relation-note{margin-top:24px}.relation-page .ant-btn{min-height:44px}.relation-page .ant-card,.relation-page .ant-modal-body{min-width:0}@media (width<=760px){.relation-form-grid{grid-template-columns:1fr;gap:0}}.exam-question-title{white-space:pre-wrap;overflow-wrap:anywhere;margin:0 0 16px;font-size:18px;line-height:1.7}.exam-question-options{display:block}.exam-question-options .ant-space{width:100%}.exam-question-options .ant-radio-wrapper{align-items:center;min-height:44px;line-height:1.7}.study-tasks{margin-bottom:32px}.study-task-heading{justify-content:space-between;align-items:center;gap:16px;display:flex}.study-task-heading h2{margin:0}.study-task-list{margin:0;padding:0;list-style:none}.study-task-list li{border-bottom:1px solid var(--border,#e6eaf0);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 16px;padding:16px 0;display:flex}.study-task-list li:last-child{border-bottom:0}.study-task-copy{overflow-wrap:anywhere;flex:180px;min-width:0}.study-task-copy p{margin:6px 0 0}.study-task-action{align-items:center;min-height:44px;display:inline-flex}.study-tasks>.muted{margin-top:12px;display:block}.study-tasks .learning-grid{grid-template-columns:repeat(2,minmax(0,1fr))}@media (width<=720px){.study-tasks .learning-grid{grid-template-columns:minmax(0,1fr)}}@media (width<=480px){.study-task-copy{flex-basis:100%}}.catalog-filter-panel{border:1px solid var(--border,#e6eaf0);border-radius:16px;margin:20px 0;padding:20px}.catalog-filter-grid{grid-template-columns:repeat(3,minmax(0,1fr));align-items:end;gap:16px;display:grid}.catalog-filter-grid label{flex-direction:column;gap:8px;min-width:0;display:flex}.catalog-filter-grid .ant-select{width:100%;min-height:44px}.catalog-filter-grid>button{min-height:44px}.catalog-filter-panel>p{margin-bottom:0}.catalog-controls .search-label{flex-wrap:wrap}.catalog-controls .search-label .subject-search{background:0 0;border-radius:0;width:320px;max-width:100%}.course-metadata{color:var(--muted);font-size:13px}.course-metadata>div{gap:8px;margin:6px 0;display:flex}.course-metadata dt{flex-shrink:0}.course-metadata dd{overflow-wrap:anywhere;min-width:0;margin:0}@media (width<=720px){.catalog-filter-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=480px){.catalog-filter-grid{grid-template-columns:minmax(0,1fr)}.catalog-controls .search-label{width:100%}}.library-controls{flex-wrap:wrap;align-items:end;gap:16px;margin:20px 0;display:flex}.library-controls label{flex-direction:column;flex:240px;gap:8px;min-width:0;display:flex}.library-controls .ant-select{width:100%;min-height:44px}.library-controls>button{min-height:44px}@media (width<=480px){.library-controls label{flex-basis:100%}}.study-hub-hero{border:1px solid var(--border);background:var(--surface-blue);border-radius:24px;grid-template-columns:1.7fr 1fr;align-items:center;gap:40px;padding:36px;display:grid}.study-hub-hero .page-title{margin-top:8px}.study-hub-actions{flex-wrap:wrap;gap:12px;margin-top:24px;display:flex}.study-hub-note{background:var(--paper);border-radius:18px;padding:28px}.study-hub-note>svg{color:var(--brand-blue);margin-bottom:16px;display:block}.study-hub-note strong{font-size:20px;display:block}.study-hub-note small{color:var(--muted)}.study-path{grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin:28px 0;display:grid}.study-path-item{border:1px solid var(--border);border-radius:18px;padding:24px;transition:border-color .2s,background .2s;position:relative}.study-path-item:hover{border-color:var(--brand-blue);background:var(--surface-blue)}.study-path-item>span{color:var(--brand-blue);margin-bottom:10px;font-size:14px;font-weight:700;display:block}.study-path-item strong{font-size:20px}.study-path-item p{color:var(--muted);margin-bottom:22px}.study-path-item>svg{color:var(--brand-blue);position:absolute;bottom:20px;right:20px}.study-scope{flex-wrap:wrap;gap:8px 20px;margin-bottom:28px;display:flex}.study-scope span{color:var(--muted)}#sync-courses{scroll-margin-top:24px}@media (width<=900px){.study-path{grid-template-columns:repeat(2,minmax(0,1fr))}.study-hub-hero{grid-template-columns:1fr;gap:20px;padding:24px}}@media (width<=480px){.study-hub-hero,.study-hub-note{padding:20px}.study-path{gap:10px}.study-path-item{padding:18px 14px 28px}.study-path-item strong{font-size:18px}.study-hub-actions>a{justify-content:center;width:100%}}@media (prefers-reduced-motion:reduce){.study-path-item{transition:none}}.photo-question{margin:24px 0}.photo-fieldset{border:0;min-width:0;margin:0;padding:0}.photo-preview-wrap{display:block}.photo-correction{gap:16px;margin:24px 0;display:grid}.photo-correction label:has(input[type=range]){gap:8px;display:grid}.photo-correction input[type=range]{width:100%;min-height:44px;accent-color:var(--brand-blue)}.ai-current-answer{margin:24px 0;scroll-margin-top:100px}.photo-picker,.photo-editor{flex-direction:column;gap:10px;margin:20px 0;display:flex}.photo-picker input{border:1px solid var(--border);background:var(--surface-blue);border-radius:8px;width:100%;min-height:44px;padding:8px}.photo-preview{object-fit:contain;border:1px solid var(--border);border-radius:12px;max-width:100%;max-height:360px;margin:16px 0;display:block}.trial-grid{grid-template-columns:1fr 1fr;gap:24px;margin-top:24px;display:grid}.readiness-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:20px;margin:24px 0;display:grid}.trial-list{padding-left:22px}.trial-list li{margin-bottom:24px;padding-left:4px}.trial-list p{color:var(--muted);margin:8px 0}@media (width<=800px){.trial-grid{grid-template-columns:1fr}}.crop-stage{background:var(--surface-blue);border-radius:10px;width:100%;max-width:780px;margin:20px 0;position:relative;overflow:hidden}.crop-stage .photo-preview{border:0;border-radius:0;width:100%;max-height:none;margin:0;display:block}.crop-overlay{border:2px solid var(--brand-blue);pointer-events:none;position:absolute;box-shadow:0 0 0 2000px #0f1e327a}.crop-controls{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 24px;max-width:780px;margin:20px 0;display:grid}.crop-controls label{flex-direction:column;gap:8px;display:flex}.crop-controls input{width:100%;min-height:44px;accent-color:var(--brand-blue)}.photo-search{border-top:1px solid var(--border);margin:24px 0;padding-top:16px}.photo-search li{overflow-wrap:anywhere;margin:12px 0}.practice-search{flex-direction:column;gap:8px;min-width:240px;max-width:100%;display:flex}