:root{
  --primary:#0b5cff;--primary-2:#18a9e6;--navy:#061c44;--navy-2:#0a3977;
  --text:#0d1c38;--muted:#71809b;--bg:#f3f6fb;--surface:#fff;--surface-2:#f7f9fd;
  --line:#dfe6f1;--success:#079a67;--warning:#d87906;--danger:#d33e49;--purple:#7357ea;
  --shadow:0 18px 55px rgba(16,42,82,.10);--shadow-sm:0 8px 24px rgba(16,42,82,.07);
  --radius:22px;--rail:248px;--top:76px;--font:Inter,"Segoe UI",Tahoma,Arial,sans-serif;
}
:root[data-theme="dark"]{
  --text:#edf4ff;--muted:#a8b6cf;--bg:#071120;--surface:#0d1b30;--surface-2:#12243d;--line:#263b5b;
  --navy:#06162d;--navy-2:#0a356e;--shadow:0 22px 70px rgba(0,0,0,.28);--shadow-sm:0 10px 28px rgba(0,0,0,.22)
}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:var(--font);background:var(--bg);color:var(--text)}body{overflow-x:hidden}button,input,select,textarea{font:inherit}button{cursor:pointer}a{color:inherit;text-decoration:none}.icon{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.hidden{display:none!important}.small{font-size:12px;color:var(--muted);line-height:1.6}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.stack{display:grid;gap:12px}.full{width:100%}
.primary-btn,.secondary-btn,.ghost-btn,.danger-btn,.icon-btn{border-radius:14px;display:inline-flex;align-items:center;justify-content:center;gap:9px;transition:.18s ease;min-height:44px;padding:0 16px;font-weight:800;border:1px solid transparent}.primary-btn{background:linear-gradient(135deg,var(--primary),#0950d7);color:#fff;box-shadow:0 10px 25px rgba(11,92,255,.22)}.primary-btn:hover{transform:translateY(-1px);box-shadow:0 14px 30px rgba(11,92,255,.28)}.secondary-btn{background:var(--surface);color:var(--primary);border-color:rgba(11,92,255,.28)}.ghost-btn{background:var(--surface-2);color:var(--text);border-color:var(--line)}.danger-btn{background:rgba(211,62,73,.09);color:var(--danger);border-color:rgba(211,62,73,.25)}.icon-btn{width:44px;padding:0;background:var(--surface);color:var(--text);border-color:var(--line);box-shadow:var(--shadow-sm)}.icon-btn:hover,.secondary-btn:hover,.ghost-btn:hover{border-color:rgba(11,92,255,.4);color:var(--primary)}button:disabled{opacity:.55;cursor:not-allowed;transform:none!important}

/* Login */
.login-page{min-height:100vh;display:grid;grid-template-columns:minmax(440px,.92fr) minmax(0,1.08fr);grid-template-areas:"visual panel";direction:ltr;background:radial-gradient(circle at 15% 5%,rgba(24,169,230,.13),transparent 34%),var(--bg)}.login-panel{grid-area:panel;direction:rtl;display:grid;place-items:center;padding:54px 42px;position:relative}.login-visual{grid-area:visual;direction:rtl;display:grid;place-items:center;position:relative;overflow:hidden;background:linear-gradient(145deg,rgba(10,84,210,.90),rgba(28,176,226,.78)),url('unicloud-campus.webp') center/cover}.login-visual::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 76% 20%,rgba(255,255,255,.22),transparent 28%),linear-gradient(to top,rgba(2,23,58,.35),transparent 55%)}.login-brand{position:relative;z-index:2;width:min(660px,88%);text-align:center;color:#fff}.login-logo{width:min(360px,72%);height:auto;filter:drop-shadow(0 18px 28px rgba(0,30,92,.24));margin-bottom:18px}.login-brand h1{font-size:42px;margin:0 0 12px}.login-brand p{font-size:18px;line-height:1.9;color:#e6f3ff;max-width:570px;margin:0 auto}.login-values{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:34px}.login-value{padding:16px 12px;border:1px solid rgba(255,255,255,.25);border-radius:18px;background:rgba(255,255,255,.12);backdrop-filter:blur(10px)}.login-value .icon{width:27px;height:27px;margin-bottom:7px}.login-value b{display:block}.login-value span{font-size:12px;color:#e4f1ff}.login-tools{position:absolute;top:22px;right:24px;display:flex;gap:8px;z-index:3}.language-btn{min-width:94px}.login-card{width:min(500px,100%);background:var(--surface);border:1px solid var(--line);border-radius:30px;padding:30px;box-shadow:var(--shadow)}.login-head{text-align:center;margin-bottom:24px}.login-head img{width:105px;margin-bottom:8px}.login-head h2{font-size:32px;margin:4px 0 7px}.login-head p{margin:0;color:var(--muted);line-height:1.7}.auth-segment{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;padding:5px;border:1px solid var(--line);border-radius:16px;background:var(--surface-2);margin-bottom:20px}.auth-segment button{border:0;border-radius:11px;background:transparent;color:var(--muted);padding:10px 6px;font-weight:800}.auth-segment button.active{background:var(--surface);color:var(--primary);box-shadow:var(--shadow-sm)}.field{display:grid;gap:7px;margin-bottom:15px}.field label{font-size:13px;font-weight:800}.field input,.field select,.field textarea{width:100%;border:1px solid var(--line);border-radius:14px;background:var(--surface);color:var(--text);padding:13px 14px;outline:none}.field textarea{min-height:100px;resize:vertical}.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(11,92,255,.10)}.field-help{font-size:12px;color:var(--muted)}.activation-card{border:1px solid rgba(11,92,255,.22);background:rgba(11,92,255,.055);border-radius:17px;padding:13px;margin-bottom:14px}.activation-card b{display:block;margin-bottom:4px}.login-note{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:13px;margin:6px 0 16px}.text-link{border:0;background:transparent;color:var(--primary);font-weight:800;padding:0}.version{display:block;text-align:center;color:var(--muted);font-size:11px;margin-top:16px}

/* Splash */
.splash{position:fixed;inset:0;z-index:1000;display:grid;place-items:center;background:radial-gradient(circle at center,#fff 0,#eef6ff 55%,#dcecff 100%);animation:splashOut .5s ease 3.2s forwards}.splash-brand{text-align:center}.splash-cloud{width:184px;height:150px;margin:auto;position:relative}.splash-cloud svg{width:100%;height:100%}.splash-cloud path.cloud-line{stroke-dasharray:560;stroke-dashoffset:560;animation:drawCloud 1.15s ease forwards}.splash-cap{opacity:0;transform:translateY(-36px) scale(.78);transform-origin:center;animation:capIn .7s cubic-bezier(.2,.9,.2,1.15) 1.05s forwards}.splash-word{font-size:46px;font-weight:900;letter-spacing:-2px;opacity:0;transform:translateY(12px);animation:wordIn .55s ease 1.72s forwards}.splash-tag{font-size:18px;font-weight:800;color:#24446f;opacity:0;animation:wordIn .5s ease 2.18s forwards}.splash-shine{position:absolute;width:36px;height:36px;border-radius:50%;background:radial-gradient(circle,#fff 0,rgba(255,255,255,.75) 24%,transparent 72%);filter:blur(1px);opacity:0;animation:shine 1s ease 1.9s forwards}@keyframes drawCloud{to{stroke-dashoffset:0}}@keyframes capIn{to{opacity:1;transform:none}}@keyframes wordIn{to{opacity:1;transform:none}}@keyframes shine{0%{opacity:0;transform:translate(-90px,20px)}45%{opacity:1}100%{opacity:0;transform:translate(90px,-18px)}}@keyframes splashOut{to{opacity:0;visibility:hidden}}

/* Application shell */
.app-shell{min-height:100vh;display:grid;grid-template-columns:minmax(0,1fr) var(--rail);grid-template-areas:"main rail";direction:ltr}.side-rail{grid-area:rail;direction:rtl;position:fixed;right:0;top:0;bottom:0;width:var(--rail);z-index:100;background:linear-gradient(180deg,var(--navy),var(--navy-2));color:#e9f2ff;padding:20px 15px;display:flex;flex-direction:column;box-shadow:-10px 0 35px rgba(2,22,55,.12)}.rail-brand{display:flex;align-items:center;justify-content:center;padding:4px 2px 19px;border-bottom:1px solid rgba(255,255,255,.13)}.rail-brand img{width:172px;max-height:92px}.rail-nav{display:grid;gap:7px;margin-top:18px}.nav-btn{border:0;background:transparent;color:#c8d7eb;border-radius:14px;min-height:52px;padding:0 14px;display:flex;align-items:center;gap:13px;font-weight:800;text-align:right}.nav-btn:hover{background:rgba(255,255,255,.08);color:#fff}.nav-btn.active{background:linear-gradient(135deg,#1268ff,#0e58db);color:#fff;box-shadow:0 12px 24px rgba(0,71,210,.25)}.nav-btn .icon{width:24px;height:24px}.rail-bottom{margin-top:auto;border-top:1px solid rgba(255,255,255,.13);padding-top:14px;display:grid;gap:7px}.rail-bottom .nav-btn{min-height:45px}.main-shell{grid-area:main;direction:rtl;min-width:0;margin-right:var(--rail)}.topbar{height:var(--top);position:sticky;top:0;z-index:80;background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(18px);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 26px}.topbar-primary,.topbar-tools{display:flex;align-items:center;gap:10px}.profile-chip{display:flex;align-items:center;gap:10px}.avatar{width:44px;height:44px;border-radius:15px;background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;display:grid;place-items:center;font-weight:900}.profile-chip b{display:block}.profile-chip span{display:block;color:var(--muted);font-size:12px}.course-switch{border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:14px;padding:10px 12px;min-width:190px}.mobile-menu{display:none}.page{padding:26px;max-width:1500px;margin:0 auto}.page-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;margin-bottom:20px}.page-head h2{margin:0 0 5px;font-size:29px}.page-head p{margin:0;color:var(--muted)}
.hero{border-radius:26px;padding:28px 30px;background:linear-gradient(135deg,#0a51d6,#0a7cf0 58%,#22b4d4);color:#fff;display:flex;align-items:center;justify-content:space-between;gap:22px;box-shadow:0 18px 45px rgba(11,92,255,.20);position:relative;overflow:hidden}.hero::before{content:"";position:absolute;width:430px;height:430px;border:80px solid rgba(255,255,255,.06);border-radius:50%;left:-180px;bottom:-290px}.hero-copy{position:relative;z-index:1}.hero h1{font-size:35px;margin:0 0 9px}.hero p{margin:0 0 20px;color:#dcecff;font-size:16px}.hero-art{width:130px;height:130px;border-radius:30px;background:rgba(255,255,255,.15);display:grid;place-items:center}.hero-art .icon{width:64px;height:64px}.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin:18px 0}.stat-card,.panel,.action-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm)}.stat-card{padding:18px;display:flex;align-items:center;gap:14px}.stat-icon{width:50px;height:50px;border-radius:16px;background:var(--surface-2);color:var(--primary);display:grid;place-items:center}.stat-card b{display:block;font-size:26px}.stat-card span{font-size:13px;color:var(--muted)}.section-title{font-size:20px;margin:24px 0 12px}.action-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px}.action-card{padding:20px;text-align:right;color:var(--text);transition:.18s}.action-card:hover{transform:translateY(-2px);border-color:rgba(11,92,255,.35)}.action-card .stat-icon{margin-bottom:12px}.action-card b{display:block;font-size:17px;margin-bottom:4px}.action-card span{font-size:13px;color:var(--muted)}.dashboard-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:16px}.panel{overflow:hidden}.panel-head{padding:17px 19px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:10px}.panel-head h3{margin:0;font-size:19px}.panel-body{padding:18px}.list{display:grid}.list-item{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:12px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}.list-item:last-child{border-bottom:0}.list-item b{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.list-item small{color:var(--muted);display:block;line-height:1.5}.list-icon{width:44px;height:44px;border-radius:14px;background:var(--surface-2);color:var(--primary);display:grid;place-items:center}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:15px}.toolbar-actions{display:flex;gap:8px;flex-wrap:wrap}.search-input{border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:14px;padding:12px 14px;min-width:260px}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:20px;background:var(--surface)}table{width:100%;border-collapse:collapse;min-width:760px}th,td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:right;vertical-align:middle}th{background:var(--surface-2);color:var(--muted);font-size:12px;white-space:nowrap}tr:last-child td{border-bottom:0}.status{display:inline-flex;align-items:center;border-radius:999px;padding:5px 10px;font-size:12px;font-weight:800}.status.ok{background:rgba(7,154,103,.10);color:var(--success)}.status.warn{background:rgba(216,121,6,.10);color:var(--warning)}.status.off{background:rgba(211,62,73,.10);color:var(--danger)}.empty{text-align:center;padding:44px;color:var(--muted)}.empty .icon{width:48px;height:48px;margin-bottom:10px}

/* Modal and workflows */
.modal-back{position:fixed;inset:0;z-index:250;background:rgba(3,13,28,.52);backdrop-filter:blur(6px);display:grid;place-items:center;padding:18px}.modal{width:min(720px,100%);max-height:92vh;overflow:auto;background:var(--surface);border:1px solid var(--line);border-radius:25px;box-shadow:0 28px 90px rgba(0,0,0,.30)}.modal.wide{width:min(1050px,100%)}.modal-head,.modal-foot{padding:18px 20px;display:flex;align-items:center;justify-content:space-between;gap:10px}.modal-head{border-bottom:1px solid var(--line)}.modal-head h3{margin:0}.modal-body{padding:20px}.modal-foot{border-top:1px solid var(--line);justify-content:flex-start;position:sticky;bottom:0;background:var(--surface)}.close-btn{border:0;width:40px;height:40px;border-radius:13px;background:var(--surface-2);color:var(--text)}.workflow-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.choice-card{border:1px solid var(--line);border-radius:18px;background:var(--surface);padding:17px;text-align:right;color:var(--text)}.choice-card.active{border-color:var(--primary);box-shadow:0 0 0 4px rgba(11,92,255,.10)}.choice-card b{display:block;margin-bottom:4px}.choice-card span{font-size:12px;color:var(--muted)}.qr-stage{display:grid;grid-template-columns:320px 1fr;gap:20px;align-items:center}.qr-box{background:#fff;border:1px solid #d9e2ef;border-radius:22px;padding:18px;display:grid;place-items:center;min-height:290px}.qr-box img,.qr-box canvas{max-width:100%;height:auto}.qr-countdown{font-size:50px;font-weight:900;color:var(--primary)}.code-display{font:900 44px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:7px;text-align:center;padding:20px;background:var(--surface-2);border-radius:18px;color:var(--primary);direction:ltr}.camera-shell{position:relative;overflow:hidden;border-radius:20px;background:#020713;min-height:360px}.camera-shell video{width:100%;height:360px;object-fit:cover;display:block}.camera-overlay{position:absolute;inset:45px;border:3px solid #33c8ff;border-radius:24px;box-shadow:0 0 0 999px rgba(0,0,0,.35)}.import-drop{border:2px dashed #b9c8dc;border-radius:20px;padding:28px;text-align:center;background:var(--surface-2)}.import-drop.drag{border-color:var(--primary);background:rgba(11,92,255,.06)}.preview-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:14px 0}.preview-metric{padding:13px;border:1px solid var(--line);border-radius:15px;background:var(--surface-2)}.preview-metric b{font-size:22px;display:block}.question-editor{padding:16px;border:1px solid var(--line);border-radius:18px;margin-bottom:12px}.question-card{padding:18px;border:1px solid var(--line);border-radius:18px;margin-bottom:14px}.option{display:flex;gap:10px;align-items:center;padding:11px;border:1px solid var(--line);border-radius:13px;margin-top:8px}.option input{accent-color:var(--primary)}.assessment-timer{font:900 25px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--primary);direction:ltr}.lecture-card{display:grid;grid-template-columns:54px minmax(0,1fr) auto;gap:13px;align-items:center;padding:14px;border-bottom:1px solid var(--line)}.lecture-card:last-child{border-bottom:0}.presentation{position:fixed;inset:0;z-index:500;background:#071326;color:#fff;padding:40px;display:grid;grid-template-rows:auto 1fr}.presentation-content{display:grid;place-items:center;text-align:center;font-size:32px}.toast-root{position:fixed;left:20px;bottom:20px;z-index:700;display:grid;gap:8px}.toast{min-width:270px;max-width:390px;padding:14px 16px;border-radius:16px;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);font-weight:800}.toast.ok{border-inline-start:5px solid var(--success)}.toast.err{border-inline-start:5px solid var(--danger)}.mobile-nav{display:none}

@media(max-width:1100px){:root{--rail:220px}.stats,.action-grid{grid-template-columns:repeat(2,1fr)}.dashboard-grid{grid-template-columns:1fr}}
@media(max-width:840px){
  .login-page{grid-template-columns:1fr;grid-template-areas:"panel"}.login-visual{display:none}.login-panel{padding:80px 16px 30px}.login-tools{right:16px}.login-card{padding:24px}
  .app-shell{display:block}.side-rail{width:min(300px,88vw);transform:translateX(110%);transition:transform .22s ease}.side-rail.open{transform:none}.main-shell{margin-right:0}.topbar{height:68px;padding:0 14px}.mobile-menu{display:inline-flex}.course-switch{min-width:0;max-width:165px}.profile-chip .profile-text{display:none}.page{padding:18px 14px 92px}.hero{padding:22px}.hero h1{font-size:28px}.hero-art{width:90px;height:90px}.stats,.action-grid{grid-template-columns:1fr 1fr}.page-head{align-items:center}.toolbar{flex-direction:column;align-items:stretch}.search-input{width:100%;min-width:0}.qr-stage{grid-template-columns:1fr}.workflow-grid{grid-template-columns:1fr}.mobile-nav{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;right:9px;left:9px;bottom:9px;z-index:90;background:color-mix(in srgb,var(--surface) 94%,transparent);backdrop-filter:blur(16px);border:1px solid var(--line);border-radius:20px;padding:6px;box-shadow:var(--shadow)}.mobile-nav button{border:0;background:transparent;color:var(--muted);border-radius:14px;padding:7px 3px;display:grid;place-items:center;gap:2px;font-size:10px}.mobile-nav button.active{color:var(--primary);background:var(--surface-2)}.mobile-nav .icon{width:20px;height:20px}
}
@media(max-width:540px){.login-head h2{font-size:27px}.login-values{grid-template-columns:1fr}.stats,.action-grid{grid-template-columns:1fr}.hero-art{display:none}.page-head h2{font-size:24px}.preview-summary{grid-template-columns:1fr}.modal-body{padding:16px}.topbar-tools .language-btn{width:44px;min-width:44px;font-size:0}.topbar-tools .language-btn::after{content:"文";font-size:16px}}