/* Shared blue technology visual system */
:root{font-family:'Microsoft YaHei','PingFang SC',system-ui,sans-serif;color:#142d50;background:#eff7ff;--blue:#087cff;--line:#cee4ff;--muted:#7187a6}body{background:radial-gradient(ellipse at 95% 0,#e0f0ff,transparent 55%),#eff7ff}button{background:linear-gradient(135deg,#078bff,#0869ed);box-shadow:0 4px 10px #0776ed15;min-height:42px}button:hover{filter:brightness(1.07);box-shadow:0 5px 16px #087cff26}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #65c9ff;outline-offset:3px}.secondary{background:#e9f3ff;color:#1975d7;box-shadow:none}.ghost{background:#fff;color:#38638f;border-color:#cee1f8;box-shadow:none}input,textarea,select{border-color:#cee1f6;background:#fbfdff;color:#203d63;min-height:42px}input::placeholder,textarea::placeholder{color:#93a5bc}input:focus,textarea:focus,select:focus{outline:2px solid #6ebaff;border-color:#5aaeff}label{color:#526d90}.muted,.small.muted{color:var(--muted)}.eyebrow{color:#6484ad;letter-spacing:1.8px}h1,h2,h3{color:#102c51}h1{font-weight:750;font-size:30px}h2{font-weight:650}.brand{font-size:21px;letter-spacing:.5px;gap:11px;white-space:nowrap;color:#143455}.brand-caption{font-size:15px;color:#58d5ff;margin-left:3px}.logo{width:34px;height:37px;flex-shrink:0;position:relative;background:linear-gradient(140deg,#8be7ff,#2589f5 53%,#1047bc);border-radius:0;clip-path:polygon(50% 0,95% 24%,95% 75%,50% 100%,5% 75%,5% 24%);box-shadow:none}.logo i{position:absolute;inset:11px 10px;background:#092f64;clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%)}.sidebar{width:220px;padding:0 12px 22px;background:linear-gradient(165deg,#082246,#0a2d56);color:#abcaf4;border:0;z-index:3}.sidebar .brand{height:76px;padding:0 11px;font-size:22px;color:white;gap:9px;letter-spacing:.5px}.sidebar .brand-caption{display:none}.side-label{margin:22px 16px 14px;color:#668dbb;font-size:10px}.nav{display:flex;align-items:center;gap:15px;color:#a5c6f3;padding:16px 17px;margin:6px 0;background:transparent;box-shadow:none;min-height:54px;border:1px solid transparent;font-size:14px;font-weight:500}.nav:hover{background:#164273;box-shadow:none}.nav.active{background:linear-gradient(110deg,#1555a0,#124881);border-color:#337fce40;color:white;font-weight:600;box-shadow:inset 3px 0 #43bcff}.ui-icon{width:23px;height:23px;flex-shrink:0}.nav .ui-icon{color:#7ab6ff;width:22px;height:22px}.nav.active .ui-icon{color:#9cd9ff}.side-bottom{margin:auto 4px 0;background:#113761;border:1px solid #22558a;color:#b7d5ff;padding:14px;font-size:12px}.side-bottom .muted{color:#789fc9}.dot{background:#4fd3ff;box-shadow:0 0 8px #4fd3ff70}.main{margin-left:220px;padding:100px 28px 28px;max-width:none}.topbar{position:absolute;top:0;left:220px;right:0;height:76px;background:linear-gradient(110deg,#092750,#072142);color:#c0d6f4;padding:15px 28px;border-bottom:1px solid #275485;margin:0}.topbar .eyebrow{color:#6498d2;font-size:9px;margin-bottom:4px}.topbar .muted{color:#c3d7f0;font-size:12px}.topbar .ghost{min-height:34px;padding:6px 15px;background:#113764;color:#c6e0ff;border-color:#2e5788}.topbar .pill{background:#0d4c76;color:#7ee0ff;border:1px solid #247db3;padding:7px 12px}.topbar .warning{background:#403047;color:#ffb4ad;border-color:#875267}.panel,.card{border:1px solid var(--line);border-radius:11px;background:linear-gradient(145deg,#fff,#fbfdff);box-shadow:0 5px 15px #205e9f03}.panel{padding:22px;margin-bottom:20px}.panel h2{margin-bottom:13px}.section-title{display:flex;gap:11px;align-items:center}.section-title .ui-icon{color:var(--blue);width:24px;height:24px}.hero{position:relative;isolation:isolate;overflow:hidden;border:1px solid #123e77;min-height:204px;margin-bottom:20px;padding:34px 32px;border-radius:12px;background:radial-gradient(ellipse at 75% 60%,#0a4fbb,transparent 55%),linear-gradient(110deg,#061c3f,#092b68 70%,#041c42);color:white;box-shadow:0 8px 20px #0c4f9b0b}.hero>div:first-child{position:relative;z-index:2;max-width:66%}.hero h1,.hero h2{color:white;text-shadow:0 2px 15px #001d45;font-size:28px;line-height:1.5;margin-bottom:12px;letter-spacing:.2px}.hero p{color:#c5e0ff;line-height:1.9;font-size:14px;max-width:650px}.hero .eyebrow{color:#57baff;font-size:9px}.tech-orbit{position:absolute;z-index:0;right:-25px;top:50%;transform:translateY(-50%);width:47%;min-width:330px;pointer-events:none;opacity:.95}.tech-orbit:after{content:'';position:absolute;width:45%;height:45%;left:23%;top:30%;background:#1aa5ff1c;box-shadow:0 0 55px #25aaff50;border-radius:50%}.tech-orbit svg{width:100%;display:block;filter:drop-shadow(0 0 5px #37b8ff66)}.stats{gap:16px;margin-bottom:20px}.stat{display:flex;align-items:center;gap:20px;padding:22px;border:1px solid #bddcff;background:linear-gradient(130deg,#fff,#f0f8ff);border-radius:11px;min-width:0}.stat-icon{display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#e0f5ff,#e4efff);border:1px solid #def1ff;border-radius:50%;width:64px;height:64px;flex-shrink:0;color:#087cff}.stat-icon .ui-icon{width:32px;height:32px;stroke-width:1.9}.stat strong{font-size:31px;line-height:1.2;margin:0 0 8px;color:#09274e}.stat span{color:#5d789b;font-size:13px}.columns{grid-template-columns:1.2fr 1fr;gap:20px}.main[data-page=overview]>.columns{grid-template-columns:1fr 1fr}.main[data-page=overview]>.columns .panel{min-width:0}.main[data-page=overview] #create-class{display:flex;gap:12px;align-items:flex-start}.main[data-page=overview] #create-class .field{margin:0;flex:1;min-width:0}.main[data-page=overview] #create-class button{white-space:nowrap}.main[data-page=overview] .panel>.muted{margin-bottom:17px}.linkbox{min-width:150px}.cards{gap:16px}.card{border-top:3px solid #75b9ff;padding:22px}.card h3{font-size:15px;color:#183f70}.card p{color:#5d7593}.card footer{border-color:#e4effc;color:#7790b0}.tag{background:#e8f4ff;color:#2176c6}.tag.task{background:#e8edff;color:#5269bb}.pill{background:#e7f3ff;color:#397fc2}.warning{background:#fff2e0;color:#a57727}.table-wrap{border-radius:8px}th{background:#eaf4ff;color:#51729a;font-weight:600}th,td{border-color:#e3effc;padding:15px 12px}tbody tr:hover{background:#f6fbff}.empty{color:#8ba2bd;padding:40px 15px;background:linear-gradient(145deg,#fbfdff,#f3f9ff);border:1px dashed #dceaff;border-radius:8px;margin-top:16px}.score{color:#0877ed}.check{border-color:#d9e8fa;background:#fcfeff}.check:has(input:checked){border-color:#7fbaff;background:#edf7ff}.check input{accent-color:#087cff}.check span{color:#436288}.check .muted{color:#7399bf}summary,a{color:#147ae2}pre{background:#f1f7ff;color:#45617f;border:1px solid #e0edfc}.history-item{border-color:#e3effb}.notice{border-color:#4bafff;background:#edf7ff;color:#567caa}#toast{background:#0c315d;border:1px solid #326598;box-shadow:0 8px 30px #08274f25}.login{background:#f1f8ff}.login-intro{overflow:hidden;color:white;background:radial-gradient(ellipse at 80% 80%,#0d58b5,transparent 60%),linear-gradient(145deg,#071f43,#092c5d);isolation:isolate}.login-intro:after{content:'';position:absolute;z-index:-1;width:420px;height:420px;right:-200px;bottom:0;border:1px solid #52b8ff40;box-shadow:0 0 0 50px #31a2ff09,0 0 0 100px #31a2ff09,0 0 0 150px #31a2ff07;border-radius:50%;transform:rotate(-25deg)}.login-intro .brand{color:white}.login-intro h1{color:white;position:relative;font-size:43px}.login-intro p{color:#a9c9ef;position:relative}.login-intro .eyebrow{color:#60baff}.login-form form{width:385px;padding:30px 10px}.login-form h2{color:#12345f}.login-form .field label{font-size:13px}.login-form input{background:white;padding:13px}.login-form button{padding:13px}.student{max-width:1180px;padding:30px}.student-head{padding:0 0 20px;border-bottom:1px solid #d6e8fa;margin-bottom:24px}.student-head .brand{color:#163b6b}.student .hero{min-height:188px}.student .hero h1{font-size:27px}.tabs{border-color:#d3e6fb;gap:10px}.tabs button{color:#6a86a8;box-shadow:none;border:1px solid transparent}.tabs button:hover{background:#e6f2ff}.tabs .active{background:#e2f0ff;color:#0875e9;border-color:#c8e1ff}.student .cards .card{padding:25px}.student-card summary{font-size:13px}.student-card p{line-height:1.95}.student #score-result .score{text-shadow:0 4px 18px #1687ff20}
@media(min-width:1500px){.main{padding-left:36px;padding-right:36px}.hero{min-height:214px}.hero h2{font-size:33px}.sidebar{width:232px}.main{margin-left:232px}.topbar{left:232px}.stat{padding:25px}.stat-icon{width:70px;height:70px}}
@media(max-width:1200px){.stat{gap:12px;padding:18px 14px}.stat-icon{width:48px;height:48px}.stat-icon .ui-icon{width:26px;height:26px}.stat strong{font-size:27px}.hero h2{font-size:25px}.main[data-page=overview]>.columns{grid-template-columns:1fr}.main[data-page=overview]>.columns .panel{margin-bottom:0}.main[data-page=overview]>.columns{margin-bottom:20px}}
@media(max-width:1050px){.sidebar{width:190px}.main{margin-left:190px;padding:98px 24px 24px}.topbar{left:190px;padding:15px 24px}.columns{grid-template-columns:1fr}.stats{gap:12px;grid-template-columns:repeat(2,1fr)}.stat{padding:18px 22px}.hero>div:first-child{max-width:70%}.hero h2{font-size:23px}.tech-orbit{opacity:.65;right:-95px}.hero p{font-size:13px}.brand-caption{font-size:13px}.sidebar .brand{font-size:21px}}
@media(max-width:720px){.sidebar{position:relative;inset:auto;width:auto;padding:0 15px 10px}.sidebar .brand{height:65px;margin:0}.sidebar .brand .brand-caption{display:inline}.sidebar nav{display:flex;gap:3px;overflow:auto}.nav{gap:7px;padding:10px 12px;min-height:43px;font-size:12px;white-space:nowrap;margin:0}.nav .ui-icon{width:17px;height:17px}.nav.active{box-shadow:none}.side-label,.side-bottom{display:none}.main{margin:0;padding:0 16px 25px}.topbar{position:relative;inset:auto;height:auto;min-height:65px;background:transparent;padding:18px 0;margin:0 0 18px;align-items:center;border-color:#d4e6fa;gap:12px}.topbar .eyebrow{display:none}.topbar .muted{color:#718bad;font-size:10px}.topbar>div:first-child{max-width:45%}.topbar .row{gap:8px}.topbar .pill{font-size:9px;padding:6px 8px;background:#e5f2ff;color:#347bbd;border-color:#c6e3ff}.topbar .warning{color:#a16c34;background:#fff2df;border-color:#efdabd}.topbar .ghost{color:#466c99;background:white;border-color:#c5ddf7;font-size:11px;padding:6px 10px}.main>.row.spread{gap:12px}.main h1{font-size:25px}.main #class-select{max-width:100%;width:100%;font-size:12px}.hero{padding:25px 22px;min-height:190px}.hero>div:first-child{max-width:100%}.hero h2,.student .hero h1{font-size:23px;max-width:90%}.hero p{max-width:90%;font-size:12px}.hero .eyebrow{font-size:8px;letter-spacing:1px}.tech-orbit{display:block;width:300px;min-width:300px;right:-145px;opacity:.25}.hero:after{content:'';position:absolute;inset:0;z-index:1;background:linear-gradient(90deg,#061f4730,transparent)}.stats{gap:10px}.stat{padding:18px 12px;gap:12px}.stat-icon{width:42px;height:42px}.stat-icon .ui-icon{width:24px;height:24px}.stat strong{font-size:26px;margin-bottom:5px}.stat span{font-size:11px}.panel{padding:20px}.main[data-page=overview] #create-class{flex-wrap:wrap}.main[data-page=overview] #create-class .field{flex-basis:100%}.login-intro{padding:30px;min-height:250px}.login-intro h1{font-size:29px;margin:28px 0 0}.login-intro .eyebrow{margin-top:30px!important;font-size:9px}.login-intro p{display:none}.login-form{padding:24px}.login-form form{padding:15px 0}.student{padding:20px 16px}.student-head{flex-wrap:wrap;gap:18px}.student-head .brand{font-size:19px}.student-head>.row{width:100%;justify-content:space-between}.student-head .muted{font-size:12px}.student .hero{min-height:190px}.student .tabs{gap:3px;justify-content:space-between}.tabs button{padding:10px 12px;font-size:12px}.cards{grid-template-columns:1fr}.brand .logo{width:30px;height:33px}.brand .logo i{inset:10px 9px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* Keep the full classroom brand visible on every screen. */
.brand-name{min-width:0;white-space:normal;line-height:1.35}.brand-caption{white-space:nowrap;color:#2577b3}.sidebar .brand .brand-caption{display:block;margin-left:0;font-size:14px;color:#79dfff}.login-intro .brand-caption{color:#79dfff}.topbar .workspace-brand{font-size:12px;letter-spacing:.5px;color:#a5e7ff}@media(max-width:720px){.sidebar .brand .brand-caption{display:inline}.topbar .workspace-brand{display:block;color:#31638e;font-size:11px}.topbar>div:first-child{max-width:55%}}