:root{--blue:#2563eb;--blue-dark:#1744a3;--blue-soft:#eaf2ff;--ink:#14213d;--muted:#6b7a99;--line:#e3eaf5;--bg:#f5f8fd;--white:#fff;--green:#14a673;--red:#e25353;--shadow:0 18px 50px rgba(31,71,136,.12)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:"Be Vietnam Pro",sans-serif;color:var(--ink);background:var(--bg);font-size:14px}button,input,textarea,select{font:inherit}.hidden{display:none!important}.login-page{min-height:100vh;display:grid;grid-template-columns:1.08fr .92fr;background:white}.login-brand{position:relative;overflow:hidden;padding:48px 7vw;color:white;background:linear-gradient(145deg,#123b96 0%,#2563eb 58%,#3b82f6 100%);display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:12px;color:inherit;text-decoration:none;font-size:18px;font-weight:700}.brand-mark{width:40px;height:40px;display:grid;place-items:center;border-radius:12px;background:white;color:var(--blue);box-shadow:0 8px 24px rgba(0,0,0,.12)}.hero-copy{margin:auto 0;position:relative;z-index:2;max-width:700px}.eyebrow{display:inline-block;text-transform:uppercase;letter-spacing:.12em;font-weight:700;font-size:11px;color:var(--blue);margin-bottom:12px}.eyebrow.light{color:#dbeafe}.hero-copy h1{font-size:clamp(38px,4.4vw,66px);line-height:1.12;letter-spacing:-.04em;margin:10px 0 24px}.hero-copy p{font-size:17px;line-height:1.8;color:#dce9ff;max-width:620px}.feature-row{display:flex;gap:25px;flex-wrap:wrap;margin-top:36px;color:#edf5ff}.orb{position:absolute;border-radius:50%;background:rgba(255,255,255,.08)}.orb-one{width:360px;height:360px;right:-100px;top:-90px}.orb-two{width:220px;height:220px;left:-60px;bottom:-80px}.login-panel{display:grid;place-items:center;padding:40px}.login-card{width:min(420px,100%)}.login-card h2{font-size:34px;margin:4px 0 8px;letter-spacing:-.03em}.muted{color:var(--muted)}.login-card>p{margin-bottom:30px}.login-card label,.form-grid label{display:block;font-weight:600;margin:18px 0 7px}.login-card input,.form-grid input,.form-grid textarea,.form-grid select,.answer-box{width:100%;border:1px solid var(--line);border-radius:12px;padding:14px 15px;outline:none;background:white;transition:.2s}.login-card input:focus,.form-grid input:focus,.form-grid textarea:focus,.answer-box:focus{border-color:var(--blue);box-shadow:0 0 0 4px rgba(37,99,235,.1)}.password-wrap{position:relative}.password-wrap button{position:absolute;right:10px;top:9px;border:0;background:transparent;color:var(--muted);cursor:pointer}.btn{border:0;border-radius:11px;padding:12px 18px;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:10px;text-decoration:none;transition:.2s}.btn:hover{transform:translateY(-1px)}.btn.primary{background:var(--blue);color:white;box-shadow:0 8px 20px rgba(37,99,235,.22)}.btn.ghost{background:white;color:var(--ink);border:1px solid var(--line)}.btn.danger{color:var(--red);background:#fff1f1}.btn.small{padding:8px 12px;font-size:12px}.btn.full{width:100%;margin-top:24px;justify-content:space-between}.demo-note{margin-top:22px;padding:13px 16px;border-radius:12px;background:var(--blue-soft);color:#38537f;font-size:12px;line-height:1.7}.mobile-brand{display:none}.app{display:flex;min-height:100vh}.sidebar{position:fixed;width:248px;inset:0 auto 0 0;background:#143b86;color:white;padding:26px 18px;display:flex;flex-direction:column;z-index:20}.sidebar-brand{padding:0 10px;margin-bottom:38px}.sidebar nav{display:flex;flex-direction:column;gap:7px}.nav-item{border:0;background:transparent;color:#cbdcff;border-radius:11px;padding:12px 14px;text-align:left;cursor:pointer;display:flex;gap:12px;align-items:center;font-weight:500}.nav-item:hover,.nav-item.active{background:rgba(255,255,255,.12);color:white}.nav-icon{font-size:17px;width:22px}.sidebar-foot{margin-top:auto;padding:18px 6px 2px;border-top:1px solid rgba(255,255,255,.15);display:flex;align-items:center;justify-content:space-between}.user-mini{display:flex;gap:10px;align-items:center;min-width:0}.user-mini>div:last-child{min-width:0}.user-mini strong,.user-mini small{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:125px}.user-mini small{color:#b9cdf5;margin-top:3px}.avatar{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:#dce9ff;color:#1e4ca6;font-weight:700}.icon-button{border:0;background:transparent;color:white;font-size:20px;cursor:pointer}.main{margin-left:248px;width:calc(100% - 248px)}.topbar{height:84px;background:white;border-bottom:1px solid var(--line);padding:0 36px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:10}.topbar h2{margin:3px 0 0;font-size:20px}.top-actions{display:flex;gap:10px;align-items:center}.status-dot{width:8px;height:8px;border-radius:50%;background:#22c55e}.menu-button{display:none}.content{padding:30px 36px 60px;max-width:1500px;margin:auto}.welcome{background:linear-gradient(120deg,#1e4fb5,#3b82f6);color:white;border-radius:20px;padding:30px 34px;display:flex;align-items:center;justify-content:space-between;overflow:hidden;position:relative}.welcome h1{margin:6px 0 10px;font-size:28px}.welcome p{margin:0;color:#dceaff}.welcome-badge{font-size:58px;opacity:.9}.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:22px 0}.stat-card,.card{background:white;border:1px solid var(--line);border-radius:16px;box-shadow:0 5px 20px rgba(37,68,126,.04)}.stat-card{padding:20px;display:flex;justify-content:space-between}.stat-card b{display:block;font-size:27px;margin-top:8px}.stat-icon{width:44px;height:44px;border-radius:12px;background:var(--blue-soft);display:grid;place-items:center;font-size:20px}.section-head{display:flex;align-items:end;justify-content:space-between;margin:30px 0 15px}.section-head h3{margin:0 0 5px;font-size:19px}.activity-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.activity-card{padding:0;overflow:hidden}.activity-top{height:7px;background:var(--blue)}.activity-body{padding:22px}.activity-meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}.number{font-size:12px;font-weight:700;color:var(--blue);background:var(--blue-soft);padding:7px 10px;border-radius:8px}.badge{font-size:11px;font-weight:700;padding:6px 9px;border-radius:20px;background:#eef2f7;color:#66758f}.badge.done,.badge.active{color:#087553;background:#ddf8ed}.badge.off{color:#925b00;background:#fff1d2}.activity-card h3{font-size:18px;margin:0 0 10px}.activity-card p{color:var(--muted);line-height:1.65;min-height:46px}.activity-actions{display:flex;justify-content:space-between;align-items:center;margin-top:20px}.document-link{color:var(--blue);font-weight:600;text-decoration:none}.card{padding:22px}.table-wrap{overflow:auto}.data-table{width:100%;border-collapse:collapse;min-width:720px}.data-table th,.data-table td{padding:14px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}.data-table th{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.data-table tr:last-child td{border:0}.table-user{display:flex;align-items:center;gap:10px}.table-user .avatar{width:34px;height:34px}.actions{display:flex;gap:6px}.tabs{display:flex;gap:8px;margin-bottom:20px}.tab{padding:9px 15px;border:1px solid var(--line);background:white;border-radius:9px;cursor:pointer}.tab.active{background:var(--blue);color:white;border-color:var(--blue)}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}.form-grid .span-2{grid-column:span 2}.form-grid textarea{min-height:130px;resize:vertical}.modal{position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:20px}.modal-backdrop{position:absolute;inset:0;background:rgba(10,25,58,.58);backdrop-filter:blur(3px)}.modal-card{background:white;border-radius:18px;padding:28px;position:relative;z-index:1;width:min(720px,100%);max-height:90vh;overflow:auto;box-shadow:var(--shadow)}.modal-close{position:absolute;right:17px;top:13px;border:0;background:transparent;font-size:27px;cursor:pointer;color:var(--muted)}.modal-card h2{margin:0 35px 8px 0}.activity-detail .content-text{white-space:pre-line;line-height:1.8;background:#f7f9fd;border-radius:13px;padding:18px;margin:18px 0}.answer-box{min-height:160px;resize:vertical}.submit-row{display:flex;align-items:center;justify-content:space-between;margin-top:14px}.toast{position:fixed;right:24px;top:24px;background:#122445;color:white;padding:13px 18px;border-radius:11px;z-index:200;transform:translateY(-100px);opacity:0;transition:.3s;box-shadow:var(--shadow)}.toast.show{transform:none;opacity:1}.toast.error{background:#b4233c}.empty{text-align:center;padding:50px;color:var(--muted)}.import-box{border:2px dashed #cbd8ef;border-radius:14px;padding:25px;text-align:center;background:#f8fbff;margin:18px 0}.import-box input{max-width:320px}.answer-preview{max-width:380px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.progress{height:7px;background:#e7edf6;border-radius:10px;overflow:hidden;margin-top:10px}.progress span{height:100%;display:block;background:var(--blue)}
@media(max-width:900px){.login-page{grid-template-columns:1fr}.login-brand{display:none}.mobile-brand{display:flex;color:var(--ink);margin-bottom:48px}.sidebar{transform:translateX(-100%);transition:.25s}.sidebar.open{transform:none}.main{margin-left:0;width:100%}.menu-button{display:block;border:0;background:transparent;font-size:21px;margin-right:12px}.topbar{padding:0 18px;justify-content:flex-start}.top-actions{margin-left:auto}.top-actions #topName,.status-dot{display:none}.content{padding:22px 18px 50px}.activity-grid{grid-template-columns:1fr}}
@media(max-width:600px){.login-panel{padding:28px 22px}.stat-grid{grid-template-columns:1fr}.welcome{padding:24px}.welcome-badge{display:none}.activity-actions{align-items:flex-end}.form-grid{grid-template-columns:1fr}.form-grid .span-2{grid-column:auto}.top-actions .btn{display:none}.content{padding-left:14px;padding-right:14px}.modal{padding:10px}.modal-card{padding:24px 18px}.section-head{align-items:flex-start;gap:12px}.section-head .btn{padding:10px}}
.rich-editor{border:1px solid var(--line);border-radius:12px;background:white;overflow:hidden;margin-top:8px;transition:.2s}.rich-editor:focus-within{border-color:var(--blue);box-shadow:0 0 0 4px rgba(37,99,235,.1)}.editor-toolbar{display:flex;align-items:center;gap:3px;flex-wrap:wrap;padding:8px;background:#f7f9fd;border-bottom:1px solid var(--line)}.editor-toolbar button,.editor-toolbar select{height:32px;min-width:33px;border:1px solid transparent;border-radius:7px;background:transparent;color:#334766;padding:0 8px;cursor:pointer;font-size:12px}.editor-toolbar button:hover,.editor-toolbar select:hover{background:white;border-color:var(--line);color:var(--blue)}.editor-toolbar select{max-width:105px}.tool-separator{height:22px;width:1px;background:var(--line);margin:0 3px}.editor-area{min-height:170px;padding:15px;outline:0;font-weight:400;line-height:1.7;overflow-wrap:anywhere}.editor-area:empty:before{content:attr(data-placeholder);color:#97a3b8;pointer-events:none}.editor-area img,.rich-content img{display:block;max-width:100%;height:auto;border-radius:10px;margin:12px auto}.editor-area a,.rich-content a{color:var(--blue)}.editor-area .file-chip,.rich-content .file-chip{display:inline-flex;align-items:center;gap:5px;background:var(--blue-soft);border:1px solid #cbdcff;padding:8px 11px;border-radius:9px;text-decoration:none;font-weight:600;margin:5px 2px}.editor-area h2,.rich-content h2{font-size:22px;margin:14px 0 7px}.editor-area h3,.rich-content h3{font-size:17px;margin:12px 0 6px}.editor-area blockquote,.rich-content blockquote{margin:12px 0;border-left:3px solid var(--blue);padding:8px 14px;background:var(--blue-soft);color:#40577e}.rich-content{white-space:normal!important}.rich-content p{margin:8px 0}.answer-preview{max-width:380px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.answer-preview *{display:inline;margin:0}.answer-preview img{display:none}
.editor-area{cursor:text;caret-color:var(--blue);user-select:text;-webkit-user-select:text;white-space:pre-wrap}.editor-area:focus{background:#fff}.editor-area::selection,.editor-area *::selection{background:#cfe0ff;color:var(--ink)}
.editor-field{margin:14px 0 6px}.editor-field-title{display:block;margin-bottom:6px;font-size:13px;font-weight:600;color:var(--ink)}.editor-field .rich-editor{margin-top:0}.editor-area:focus-visible{outline:none}.editor-area[contenteditable=true]{overflow:auto}
.viewable-file:after{content:"Xem";font-size:10px;color:white;background:var(--blue);padding:3px 7px;border-radius:12px;margin-left:5px}
.admin-activity-card{cursor:pointer;transition:transform .2s,box-shadow .2s}.admin-activity-card:hover{transform:translateY(-3px);box-shadow:0 15px 35px rgba(31,71,136,.12)}.back-link{border:0;background:transparent;color:var(--blue);font-weight:600;padding:0;cursor:pointer;margin-bottom:10px}.sort-control{display:flex;align-items:center;gap:9px;color:var(--muted);font-size:12px}.sort-control select{border:1px solid var(--line);border-radius:9px;background:white;padding:9px 12px;color:var(--ink);outline:none}.live-indicator{display:flex;align-items:center;gap:7px;color:var(--green);font-size:12px;font-weight:600;margin:0 0 10px}.live-indicator span{width:8px;height:8px;background:#22c55e;border-radius:50%;box-shadow:0 0 0 0 rgba(34,197,94,.5);animation:livePulse 1.8s infinite}@keyframes livePulse{70%{box-shadow:0 0 0 7px rgba(34,197,94,0)}100%{box-shadow:0 0 0 0 rgba(34,197,94,0)}}.notification-stack{position:fixed;right:20px;top:20px;width:min(390px,calc(100vw - 30px));z-index:300;display:flex;flex-direction:column;gap:10px;pointer-events:none}.submission-notification{background:white;border:1px solid #cfe0fa;border-left:5px solid var(--blue);border-radius:14px;padding:15px;display:grid;grid-template-columns:42px 1fr 22px;gap:11px;align-items:start;box-shadow:0 16px 45px rgba(19,55,112,.22);transform:translateX(calc(100% + 40px));opacity:0;transition:transform .24s ease-out,opacity .2s;pointer-events:auto}.submission-notification.show{transform:none;opacity:1}.notification-icon{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;background:#dcfce7;color:#078052;font-size:19px;font-weight:700}.submission-notification strong{display:block;color:var(--blue-dark);margin-bottom:4px}.submission-notification p{margin:0 0 5px;line-height:1.45;font-size:13px}.submission-notification small{color:var(--muted)}.submission-notification button{border:0;background:transparent;color:#8592a8;font-size:20px;cursor:pointer;padding:0}
@media(max-width:600px){.editor-toolbar{max-height:90px;overflow:auto}.editor-toolbar button{padding:0 6px}.submit-row{align-items:flex-end;gap:12px}}
@media(max-width:600px){.sort-control{width:100%;justify-content:space-between}.notification-stack{right:15px;top:12px}}
.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.course-card{padding:0;overflow:hidden;cursor:pointer;transition:.2s}.course-card:hover{transform:translateY(-3px);box-shadow:0 16px 36px rgba(26,62,119,.13)}.course-cover{height:155px;position:relative;background:linear-gradient(135deg,#1744a3,#4b8cf5);display:grid;place-items:center;overflow:hidden}.course-cover>img{width:100%;height:100%;object-fit:cover}.course-cover>span{font-size:47px;font-weight:700;color:#fff;opacity:.9}.course-id{position:absolute;left:14px;bottom:12px;background:rgba(12,35,77,.78);color:white;border-radius:7px;padding:5px 9px;font-size:11px;font-weight:700;letter-spacing:.06em}.course-body{padding:19px}.course-body h3{margin:0 0 9px;font-size:17px}.course-body>p{color:var(--muted);line-height:1.55;height:44px;overflow:hidden}.course-foot{border-top:1px solid var(--line);padding-top:14px;margin-top:15px;display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:12px}.bulk-bar{background:#eaf2ff;border:1px solid #cbdcff;border-radius:13px;padding:13px 16px;margin-bottom:14px;display:flex;align-items:center;gap:12px}.bulk-bar select{margin-left:auto;min-width:220px;border:1px solid var(--line);border-radius:9px;padding:9px;background:white}.course-chips{display:flex;gap:5px;flex-wrap:wrap}.course-chips>span{background:var(--blue-soft);color:var(--blue-dark);font-size:11px;font-weight:600;border-radius:12px;padding:5px 8px}.course-chips button{border:0;background:transparent;color:var(--red);cursor:pointer;padding:0 0 0 3px}.form-grid select{width:100%;border:1px solid var(--line);border-radius:12px;padding:14px 15px;background:white}
@media(max-width:1050px){.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:650px){.course-grid{grid-template-columns:1fr}.bulk-bar{align-items:stretch;flex-direction:column}.bulk-bar select{margin-left:0;min-width:0}}
.login-panel{position:relative}.login-footer{position:absolute;left:20px;right:20px;bottom:20px;text-align:center;color:var(--muted);font-size:12px}.app-footer{text-align:center;color:var(--muted);font-size:12px;border-top:1px solid var(--line);padding:20px;margin:0 36px}.presence{display:inline-flex;align-items:center;gap:7px;color:var(--muted);font-size:12px;white-space:nowrap}.presence i{width:8px;height:8px;border-radius:50%;background:#a7b0c0}.presence.online{color:#087553;font-weight:600}.presence.online i{background:#22c55e;box-shadow:0 0 0 3px #dcfce7}.content{min-height:calc(100vh - 145px)}
@media(max-width:600px){.login-footer{bottom:12px}.app-footer{margin:0 14px}.login-panel{padding-bottom:65px}}
.btn:disabled{opacity:.65;cursor:wait;transform:none!important}

/* UI refinement: compact controls, balanced spacing and clearer hierarchy */
.btn{min-height:42px;padding:10px 16px;border-radius:10px;font-size:13px;line-height:1.2;white-space:nowrap}.btn.small{min-height:34px;padding:7px 11px;border-radius:8px;font-size:11px}.btn.full{min-height:50px;margin-top:22px;padding:12px 17px}.actions{gap:8px;align-items:center}.section-head{margin:26px 0 14px;gap:18px}.section-head>div:first-child{min-width:0}.section-head h3{line-height:1.35}.card{padding:20px}.data-table th,.data-table td{padding:12px 11px}.topbar{height:76px;padding:0 30px}.content{padding:26px 30px 50px}.stat-grid{gap:15px;margin:18px 0}.stat-card{padding:18px}.activity-grid,.course-grid{gap:16px}.activity-body{padding:19px}.course-body{padding:17px}.course-cover{height:145px}.bulk-bar{padding:11px 14px;gap:10px}.bulk-bar .btn{flex:0 0 auto}

.login-page{background:#f4f7fc}.login-panel{padding:42px clamp(24px,5vw,70px);background:radial-gradient(circle at 85% 10%,rgba(37,99,235,.10),transparent 32%),#f7f9fd}.login-card{width:min(430px,100%);padding:34px 36px 30px;border:1px solid rgba(210,222,241,.9);border-radius:22px;background:rgba(255,255,255,.96);box-shadow:0 24px 65px rgba(24,56,111,.12)}.login-card h2{font-size:31px;line-height:1.2;margin:3px 0 7px}.login-card>p{margin:0 0 24px;line-height:1.65}.login-card label{margin:15px 0 7px;font-size:13px}.login-card input{height:48px;padding:11px 14px;border-radius:11px;font-size:14px}.password-wrap button{width:36px;height:36px;right:6px;top:6px;display:grid;place-items:center;border-radius:8px}.password-wrap button:hover{background:var(--blue-soft)}.password-wrap button svg{width:19px;height:19px;fill:none;stroke:#6e80a2;stroke-width:1.8}.login-card .btn.full{font-size:14px}.mobile-brand{margin-bottom:25px;font-size:16px}.mobile-brand .brand-mark{width:36px;height:36px;border-radius:10px}.login-footer{bottom:16px;font-size:11px;color:#7c8aa5}

.form-grid{gap:0 14px}.form-grid label{margin:14px 0 6px;font-size:13px}.form-grid input,.form-grid textarea,.form-grid select{padding:11px 13px;border-radius:10px}.form-grid input,.form-grid select{min-height:44px}.form-grid textarea{min-height:115px}.modal-card{width:min(680px,100%);padding:26px;border-radius:18px}.modal-card h2{font-size:23px;line-height:1.3}.modal-card .form-grid>.btn.span-2{justify-self:end;min-width:165px;margin-top:13px}.modal-close{right:15px;top:11px}.import-box{padding:20px}.answer-box{min-height:140px}.editor-area{min-height:145px}.submit-row{gap:14px}

@media(max-width:900px){.login-panel{min-height:100vh;padding:42px 22px 72px}.login-card{padding:30px 28px}.topbar{height:70px}.content{padding:20px 18px 42px}}
@media(max-width:600px){.login-panel{padding:24px 15px 62px;align-items:center}.login-card{padding:25px 20px 23px;border-radius:18px}.login-card h2{font-size:27px}.login-card>p{margin-bottom:20px}.mobile-brand{margin-bottom:21px}.section-head{margin:22px 0 12px;flex-wrap:wrap}.section-head>.actions{width:100%;display:grid;grid-template-columns:1fr 1fr}.section-head>.actions .btn{width:100%}.content{padding:17px 14px 38px}.card{padding:16px}.activity-body,.course-body{padding:16px}.modal-card{padding:22px 16px}.modal-card .form-grid>.btn.span-2{width:100%;justify-self:stretch}.submit-row{align-items:stretch;flex-direction:column}.submit-row .btn{width:100%}.bulk-bar .btn{width:100%}}

/* More breathing room between labels and form controls */
.login-card label{margin:19px 0 10px}.form-grid label{margin:19px 0 10px}.form-grid{row-gap:4px}.form-grid label>input,.form-grid label>select,.form-grid label>textarea,.login-card label>input,.login-card label>.password-wrap{margin-top:2px}
@media(max-width:600px){.login-card label,.form-grid label{margin-top:17px;margin-bottom:9px}}
.auth-loading .login-page,.auth-loading .app{visibility:hidden}.boot-screen{display:none;position:fixed;inset:0;z-index:1000;background:#f6f9fe;align-items:center;justify-content:center;flex-direction:column;gap:14px;color:#71809e;font-size:12px;font-weight:600;letter-spacing:.02em}.auth-loading .boot-screen{display:flex}.boot-logo{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#1744a3,#3b82f6);color:white;font-size:18px;font-weight:700;box-shadow:0 12px 28px rgba(37,99,235,.22);animation:bootPulse 1.2s ease-in-out infinite}@keyframes bootPulse{50%{transform:scale(1.06);box-shadow:0 15px 34px rgba(37,99,235,.3)}}

.course-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;padding:24px 26px;border-radius:17px;background:linear-gradient(120deg,#eef4ff,#fff);border:1px solid #dbe6f8}.course-heading h2{margin:1px 0 7px;font-size:24px}.course-heading p{margin:0;color:var(--muted);max-width:750px;line-height:1.6}.admin-course-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.course-activity{position:relative;cursor:pointer;transition:.2s}.course-activity:hover{transform:translateY(-3px);box-shadow:0 15px 34px rgba(31,71,136,.13)}.course-activity .activity-top{background:#2563eb}.course-activity.game .activity-top{background:#8b5cf6}.course-activity.quiz .activity-top{background:#0ea5a4}.activity-gear{position:absolute;z-index:2;right:13px;top:16px;width:34px;height:34px;border:1px solid var(--line);border-radius:9px;background:white;color:#657694;cursor:pointer;transition:.2s}.activity-gear:hover{background:var(--blue);border-color:var(--blue);color:white;transform:rotate(25deg)}.activity-type{display:inline-flex;align-items:center;gap:7px;font-size:11px;font-weight:700;color:#536789}.activity-type i{width:27px;height:27px;border-radius:8px;display:grid;place-items:center;background:var(--blue-soft);color:var(--blue);font-style:normal;font-size:14px}.course-activity.game .activity-type i{background:#f1eaff;color:#7c3aed}.course-activity.quiz .activity-type i{background:#dcf7f5;color:#087f7e}.course-activity .activity-meta{padding-right:38px}.course-activity .activity-actions{border-top:1px solid var(--line);padding-top:13px;color:var(--muted);font-size:12px}.open-result{color:var(--blue);font-weight:700}.activity-type-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px;margin-top:22px}.activity-type-grid>button{position:relative;min-height:190px;padding:22px 17px;border:1px solid var(--line);border-radius:15px;background:#fff;text-align:left;cursor:pointer;display:flex;flex-direction:column;align-items:flex-start;transition:.2s}.activity-type-grid>button:hover{transform:translateY(-3px);border-color:#a9c2f2;box-shadow:0 12px 28px rgba(37,70,127,.11)}.activity-type-grid i{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:var(--blue-soft);color:var(--blue);font-size:23px;font-style:normal;margin-bottom:16px}.activity-type-grid strong{font-size:16px;margin-bottom:7px}.activity-type-grid span{font-size:12px;line-height:1.55;color:var(--muted)}.activity-type-grid em{position:absolute;right:10px;top:10px;background:#fff1d6;color:#936000;border-radius:12px;padding:4px 7px;font-size:9px;font-style:normal;font-weight:700}.settings-actions{display:flex;gap:10px;border-top:1px solid var(--line);padding-top:20px;margin-top:22px}.coming-soon{text-align:center;padding:14px 10px}.coming-soon>i{width:62px;height:62px;margin:0 auto 14px;border-radius:18px;display:grid;place-items:center;background:var(--blue-soft);color:var(--blue);font-style:normal;font-size:30px}.coming-soon p{color:var(--muted);line-height:1.7;max-width:480px;margin:10px auto 22px}
@media(max-width:1150px){.admin-course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:700px){.course-heading{align-items:flex-start;flex-direction:column;padding:20px}.course-heading .btn{width:100%}.admin-course-grid,.activity-type-grid{grid-template-columns:1fr}.activity-type-grid>button{min-height:150px}.settings-actions{flex-direction:column}.settings-actions .btn{width:100%}}
/* Compact modal actions and native-size checkboxes */
.form-grid input[type="checkbox"]{width:17px!important;height:17px!important;min-height:0!important;margin:0!important;padding:0!important;accent-color:var(--blue);flex:0 0 17px}.form-grid label:has(>input[type="checkbox"]){display:flex;align-items:center;gap:9px;align-self:center;margin-top:19px;margin-bottom:10px}.modal-card .form-grid>.btn.span-2{min-width:138px;min-height:38px;padding:9px 14px;font-size:12px;border-radius:9px}.modal-card input[type="file"]{min-height:42px;padding:7px 10px;font-size:12px}.modal-card input[type="file"]::file-selector-button{margin-right:9px;padding:6px 10px;border:1px solid #cbd6e8;border-radius:7px;background:#f4f7fc;color:var(--ink);font:600 11px "Be Vietnam Pro",sans-serif;cursor:pointer}
@media(max-width:600px){.modal-card .form-grid>.btn.span-2{min-height:40px}}
.activity-course-context{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:9px;margin:17px 0 2px;padding:10px 12px;border:1px solid #d8e4f7;border-radius:10px;background:#f5f8fe}.activity-course-context span,.activity-course-context small{font-size:10px;color:var(--muted)}.activity-course-context strong{font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.activity-course-context small{padding:4px 7px;border-radius:7px;background:white;color:var(--blue);font-weight:700}
@media(max-width:600px){.activity-course-context{grid-template-columns:1fr auto}.activity-course-context span{grid-column:span 2}.activity-course-context strong{white-space:normal}}

.word-list-input{min-height:150px!important;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px!important;line-height:1.7}.field-help{display:block;color:var(--muted);font-size:10px;font-weight:400;margin-top:6px}.direction-options{border:1px solid var(--line);border-radius:11px;padding:11px 13px;margin:15px 0 4px;display:flex;gap:16px;flex-wrap:wrap}.direction-options legend{padding:0 5px;font-size:12px;font-weight:700}.direction-options label{display:flex!important;align-items:center;gap:7px;margin:4px 0!important;font-size:11px}.modal-card:has(.word-game){width:min(980px,100%)}.word-game-head{display:flex;justify-content:space-between;align-items:flex-start;gap:20px}.word-game-head h2{margin:0 0 7px}.word-game-head p{color:var(--muted);margin:0;line-height:1.6}.game-score{flex:0 0 auto;min-width:92px;padding:11px;border-radius:12px;background:var(--blue-soft);text-align:center}.game-score strong,.game-score span{display:block}.game-score strong{font-size:21px;color:var(--blue)}.game-score span{font-size:9px;color:var(--muted);margin-top:2px}.word-game-layout{display:grid;grid-template-columns:minmax(0,1fr) 245px;gap:22px;margin-top:20px;align-items:start}.word-grid{--cols:10;display:grid;grid-template-columns:repeat(var(--cols),1fr);gap:4px;padding:13px;border:2px solid #bdd2f3;border-radius:16px;background:#edf4ff;touch-action:none;user-select:none;aspect-ratio:1/1}.word-grid button{min-width:0;aspect-ratio:1/1;border:0;border-radius:7px;background:white;color:#1c2b49;font-weight:700;font-size:clamp(10px,1.5vw,17px);cursor:crosshair;box-shadow:0 1px 3px rgba(32,61,110,.1);padding:0}.word-grid button.selecting{background:#facc54;color:#4b3710;transform:scale(1.05)}.word-grid button.found{background:#22c58b;color:white}.word-game-layout aside{padding:15px;border:1px solid var(--line);border-radius:14px;background:#fafcff}.word-game-layout aside h3{margin:0 0 11px}.game-hint{display:grid;grid-template-columns:29px 1fr;gap:9px;align-items:center;padding:8px 0;border-bottom:1px solid var(--line)}.game-hint>span{width:27px;height:27px;border-radius:8px;display:grid;place-items:center;background:#edf2f8;color:#62718b;font-size:10px;font-weight:700}.game-hint strong,.game-hint small{display:block}.game-hint strong{font-size:11px}.game-hint small{color:var(--muted);font-size:9px;margin-top:2px;line-height:1.4}.game-hint.found>span{background:#dcfce7;color:#078052}.game-hint.found strong{text-decoration:line-through;color:#078052}.word-game-layout aside>.btn{width:100%;margin-top:13px}.game-message{text-align:center;margin-top:14px;color:#526581;font-size:12px;font-weight:600}.leaderboard-list{display:flex;flex-direction:column;gap:8px;margin-top:18px}.leader-row{display:grid;grid-template-columns:30px 38px 1fr auto;gap:10px;align-items:center;padding:10px 13px;border:1px solid var(--line);border-radius:12px}.leader-row>b{font-size:16px;color:#7a88a1;text-align:center}.leader-row .avatar{width:36px;height:36px}.leader-row>div strong,.leader-row>div small{display:block}.leader-row>div small{color:var(--muted);font-size:10px;margin-top:2px}.leader-row em{font-style:normal;font-weight:700;color:var(--blue);font-size:12px}.leader-row.rank-1{border-color:#f1cf6d;background:#fffbeb}.leader-row.rank-1>b{color:#c98a00}.leader-row.rank-2,.leader-row.rank-3{background:#f8faff}
@media(max-width:760px){.word-game-layout{grid-template-columns:1fr}.word-game-layout aside{order:2}.word-grid{gap:2px;padding:7px;border-radius:12px}.word-grid button{border-radius:4px}.word-game-head{flex-direction:column}.game-score{display:flex;gap:6px;align-items:baseline}.game-score strong,.game-score span{display:inline}.leader-row{grid-template-columns:25px 34px 1fr auto;padding:9px}.direction-options{gap:10px}}

/* Game timer and realtime leaderboard */
.game-status{display:flex;gap:9px}.game-timer{flex:0 0 auto;min-width:92px;padding:11px;border-radius:12px;background:#fff1f2;text-align:center}.game-timer strong,.game-timer span{display:block}.game-timer strong{font-size:21px;color:#dc3545}.game-timer span{font-size:9px;color:var(--muted);margin-top:2px}.word-grid.disabled{opacity:.62;pointer-events:none}.leader-table-head,.leader-row{display:grid;grid-template-columns:90px minmax(220px,1fr) 190px;gap:16px;align-items:center}.leader-table-head{margin-top:20px;padding:0 16px 8px;color:var(--muted);font-size:10px;font-weight:800;text-transform:uppercase;letter-spacing:.05em}.leader-table-head span:last-child{text-align:right}.leaderboard-list{margin-top:0}.leader-row{padding:14px 16px}.leader-row>strong{font-size:13px}.leader-row>em{text-align:right}.leader-row .avatar,.leader-row>div{display:none}
@media(max-width:760px){.game-status{width:100%}.game-timer,.game-score{flex:1}.leader-table-head,.leader-row{grid-template-columns:52px minmax(120px,1fr) 95px;gap:8px;padding-left:9px;padding-right:9px}.leader-table-head{font-size:8px}}
.game-complete{text-align:center;padding:18px 8px 8px}.complete-icon{width:72px;height:72px;margin:0 auto 18px;border-radius:50%;display:grid;place-items:center;background:#dcfce7;color:#078052;font-size:34px;font-weight:900;box-shadow:0 0 0 10px #f0fdf4}.game-complete h2{margin:8px 0}.game-complete>p{color:var(--muted)}.complete-result{display:flex;flex-direction:column;width:min(260px,100%);margin:22px auto;padding:18px;border-radius:15px;background:var(--blue-soft)}.complete-result strong{font-size:30px;color:var(--blue)}.complete-result span{font-size:11px;color:var(--muted);margin-top:4px}.complete-actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}

/* Three-column course layout */
.course-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.btn.priority-active{background:#f59e0b;border-color:#f59e0b;color:#fff}.btn.priority-active:hover{background:#d97706}.course-card .course-foot .actions{justify-content:flex-end;flex-wrap:wrap}
@media(max-width:800px){.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:560px){.course-grid{grid-template-columns:1fr}}

/* Notification center */
.notification-center{position:relative}.notification-bell{position:relative;width:40px;height:40px;border:1px solid var(--line);border-radius:11px;background:#fff;color:transparent;font-size:0;cursor:pointer;transition:.2s}.notification-bell:before{content:'🔔';color:#314563;font-size:18px}.notification-bell:hover,.notification-bell[aria-expanded=true]{background:var(--blue-soft);border-color:#b9cef4}.notification-badge{position:absolute;right:-5px;top:-6px;min-width:20px;height:20px;padding:0 5px;border:2px solid #fff;border-radius:999px;background:#ef4444;color:#fff;font-size:9px;font-weight:800;display:grid;place-items:center}.notification-panel{position:absolute;right:0;top:49px;width:min(420px,calc(100vw - 28px));max-height:min(650px,calc(100vh - 90px));overflow:hidden;border:1px solid #d9e3f3;border-radius:16px;background:#fff;box-shadow:0 20px 55px rgba(15,42,86,.22);z-index:60}.notification-panel.admin-panel{border:2px solid #f2b84b;box-shadow:0 20px 60px rgba(109,40,217,.2)}.notification-panel-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 17px;border-bottom:1px solid var(--line);background:#f8fbff}.admin-panel .notification-panel-head{background:linear-gradient(120deg,#f4edff,#fff8df)}.notification-panel-head strong,.notification-panel-head small{display:block}.notification-panel-head strong{font-size:14px}.admin-panel .notification-panel-head strong{color:#6d28d9}.notification-panel-head small{margin-top:3px;color:var(--muted);font-size:9px}.notification-panel-head button{border:0;background:transparent;color:var(--blue);font-size:10px;font-weight:700;cursor:pointer;white-space:nowrap}.notification-list{max-height:520px;overflow:auto}.notification-entry{display:grid;grid-template-columns:38px 1fr;gap:11px;padding:14px 16px;border-bottom:1px solid #edf1f7;background:#fff}.notification-entry.unread{background:#f1f6ff}.notification-entry.admin-entry.unread{background:linear-gradient(90deg,#f4edff,#fffaf0);border-left:4px solid #7c3aed}.notification-entry-icon{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;background:#e8f1ff;color:var(--blue);font-weight:800}.admin-entry .notification-entry-icon{background:#f1e8ff;color:#7c3aed}.notification-entry-title{display:flex;align-items:center;gap:7px}.notification-entry-title strong{font-size:12px;color:#1d2b46}.notification-entry-title em{padding:3px 5px;border-radius:5px;background:#7c3aed;color:#fff;font-size:7px;font-style:normal;letter-spacing:.08em}.notification-entry p{margin:4px 0 6px;color:#4f607b;font-size:11px;line-height:1.5}.notification-entry time{color:#8a97aa;font-size:9px}.notification-empty{padding:35px 18px;text-align:center;color:var(--muted);font-size:11px}
@media(max-width:600px){.notification-panel{position:fixed;right:10px;left:10px;top:66px;width:auto;max-height:calc(100vh - 78px)}.notification-list{max-height:calc(100vh - 150px)}}

/* Flat 2D bell and three-column activity layout */
.notification-bell:before{content:'';display:block;width:20px;height:20px;margin:auto;background-color:#314563;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23000' d='M12 22a2.5 2.5 0 0 0 2.35-1.65h-4.7A2.5 2.5 0 0 0 12 22Zm7-5.5-1.5-2V9a5.5 5.5 0 0 0-4.25-5.36V2.5a1.25 1.25 0 0 0-2.5 0v1.14A5.5 5.5 0 0 0 6.5 9v5.5l-1.5 2V18h14v-1.5Z'/%3E%3C/svg%3E") center/contain no-repeat;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23000' d='M12 22a2.5 2.5 0 0 0 2.35-1.65h-4.7A2.5 2.5 0 0 0 12 22Zm7-5.5-1.5-2V9a5.5 5.5 0 0 0-4.25-5.36V2.5a1.25 1.25 0 0 0-2.5 0v1.14A5.5 5.5 0 0 0 6.5 9v5.5l-1.5 2V18h14v-1.5Z'/%3E%3C/svg%3E") center/contain no-repeat}.notification-bell:hover:before,.notification-bell[aria-expanded=true]:before{background-color:var(--blue)}
.activity-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.activity-card h3{font-size:16px}.activity-card p{font-size:12px}.activity-body{padding:18px}.activity-actions{gap:10px}.activity-actions .btn{flex:0 0 auto}
@media(max-width:1100px){.activity-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:700px){.activity-grid{grid-template-columns:1fr}}
.notification-show-all{width:100%;padding:13px 16px;border:0;border-top:1px solid var(--line);background:#f8fbff;color:var(--blue);font-size:11px;font-weight:800;cursor:pointer}.notification-show-all:hover{background:#edf4ff}.notification-show-all span{color:var(--muted);font-weight:600}.admin-panel .notification-show-all{background:#faf5ff;color:#6d28d9}.admin-panel .notification-show-all:hover{background:#f3e8ff}

/* Compact course workspace */
#pageTitle{max-width:min(720px,52vw);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.topbar>div:not(.top-actions){min-width:0}.topbar #greeting{display:block;max-width:min(760px,55vw);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.course-compact-bar{min-height:42px;margin:0 0 13px;display:flex;align-items:center;gap:14px}.course-compact-bar .back-link{margin:0}.course-compact-bar>span{color:var(--muted);font-size:11px}.course-compact-bar>span strong{color:var(--ink);font-size:13px}.course-compact-bar>.btn{margin-left:auto}.course-compact-bar+.activity-grid{margin-top:0}
@media(max-width:700px){#pageTitle{max-width:45vw;font-size:16px}.topbar #greeting{max-width:45vw}.course-compact-bar{flex-wrap:wrap;gap:9px}.course-compact-bar>.btn{width:auto;margin-left:auto}}
.course-compact-actions{margin-left:auto;display:flex;align-items:center;gap:7px}.instructor-link{min-height:34px;max-width:260px;display:flex;align-items:center;gap:7px;padding:7px 11px;border:1px solid #d7e2f3;border-radius:9px;background:#fff;color:#395373;font-size:10px;font-weight:700;cursor:pointer}.instructor-link:hover{border-color:#a9c2ed;color:var(--blue);background:var(--blue-soft)}.instructor-link span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.instructor-edit{width:34px;height:34px;border:1px solid #d7e2f3;border-radius:9px;background:#fff;color:var(--blue);cursor:pointer}.instructor-edit:hover{background:var(--blue);border-color:var(--blue);color:#fff}.instructor-profile{position:relative;padding-top:4px}.instructor-profile-icon{float:left;width:48px;height:48px;margin:0 14px 8px 0;border-radius:14px;display:grid;place-items:center;background:var(--blue-soft);color:var(--blue);font-size:22px}.instructor-profile h2{padding-top:1px}.instructor-rich{clear:both;margin-top:24px;padding:18px;border:1px solid var(--line);border-radius:13px;background:#f8fbff;line-height:1.75}.instructor-rich img{max-width:100%;height:auto;border-radius:10px}.instructor-empty{clear:both;margin:22px 0;padding:30px}.modal-card:has(#instructorForm){width:min(820px,100%)}#instructorForm .rich-editor{margin-top:8px}
@media(max-width:700px){.course-compact-actions{width:100%;margin-left:0}.instructor-link{flex:1;max-width:none}.course-compact-actions .btn{margin-left:auto}.instructor-profile-icon{width:42px;height:42px}}

/* Priority activity (one per course) */
.activity-card.priority{position:relative;border:2px solid #f0b429;background:linear-gradient(180deg,#fffdf5,#fff);box-shadow:0 14px 34px rgba(217,145,0,.15)}.activity-card.priority .activity-top{background:#f0a500}.activity-card.priority .activity-body{padding-top:52px}.activity-priority-ribbon{position:absolute;z-index:2;left:18px;top:17px;padding:6px 9px;border-radius:8px;background:#fff4cf;color:#8b5b00;font-size:9px;font-weight:800;letter-spacing:.02em}.activity-card.priority .activity-gear{border-color:#f1d58e}.activity-settings-actions{display:grid;grid-template-columns:repeat(3,1fr)}
@media(max-width:650px){.activity-settings-actions{grid-template-columns:1fr}.activity-settings-actions .btn{width:100%}}

/* Highlighted leaderboard panel */
.leaderboard{padding:26px 28px 28px;border:1px solid var(--line);border-radius:18px;background:#fff;box-shadow:0 12px 32px rgba(31,71,136,.08)}.leaderboard>h2{margin:7px 0 9px}.leaderboard>p{margin:0}.leaderboard .leader-table-head{margin-top:24px}.leaderboard .leader-row{background:#fff}.leaderboard .leader-row.rank-1{background:#fffbeb}.leaderboard .leader-row.rank-2,.leaderboard .leader-row.rank-3{background:#f8faff}
@media(max-width:760px){.leaderboard{padding:20px 14px;border-radius:14px}}

/* Admin educational game library */
.game-library-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:22px;padding:24px 26px;border:1px solid #dbe6f7;border-radius:17px;background:linear-gradient(120deg,#eef4ff,#fff)}.game-library-head h2{margin:0 0 7px;font-size:25px}.game-library-head p{margin:0;color:var(--muted);line-height:1.6}.game-library-count{flex:0 0 auto;padding:7px 10px;border-radius:8px;background:#fff;color:var(--blue);font-size:10px;font-weight:800;border:1px solid #d7e2f3}.educational-game-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-auto-rows:minmax(230px,auto);gap:18px}.educational-game-card{position:relative;min-width:0;padding:24px;border:1px solid var(--line);border-radius:17px;background:#fff;color:var(--ink);text-align:left;cursor:pointer;box-shadow:0 7px 24px rgba(31,71,136,.05);transition:.22s;overflow:hidden}.educational-game-card:before{content:'';position:absolute;inset:0 0 auto;height:6px;background:var(--blue)}.educational-game-card:hover{transform:translateY(-4px);border-color:#b8cced;box-shadow:0 16px 38px rgba(31,71,136,.13)}.educational-game-icon{width:52px;height:52px;display:grid;place-items:center;border-radius:14px;background:var(--blue-soft);color:var(--blue);font-size:25px;font-weight:800}.educational-game-order{position:absolute;right:22px;top:24px;color:#c3cede;font-size:13px;font-weight:800}.educational-game-card>strong{display:block;margin:22px 0 9px;font-size:18px}.educational-game-card>p{min-height:60px;margin:0;color:var(--muted);font-size:11px;line-height:1.7}.educational-game-open{display:block;margin-top:18px;padding-top:14px;border-top:1px solid var(--line);color:var(--blue);font-size:11px;font-weight:800}.educational-game-card.game-theme-2:before{background:#1744a3}.educational-game-card.game-theme-3:before{background:#3b82f6}.educational-game-preview{text-align:center;padding:9px}.educational-game-preview>.educational-game-icon{margin:0 auto 14px}.educational-game-preview h2{margin:3px 0 10px}.educational-game-preview>p{max-width:510px;margin:0 auto;color:var(--muted);line-height:1.7}.coming-game-note{margin:22px 0;padding:15px;border:1px solid var(--line);border-radius:12px;background:#f8fbff;text-align:left}.coming-game-note strong,.coming-game-note span{display:block}.coming-game-note strong{font-size:12px;color:var(--blue)}.coming-game-note span{margin-top:5px;color:var(--muted);font-size:10px;line-height:1.6}
@media(max-width:1050px){.educational-game-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:650px){.game-library-head{align-items:flex-start;flex-direction:column;padding:20px}.educational-game-grid{grid-template-columns:1fr;grid-auto-rows:auto}.educational-game-card{min-height:220px}}

/* Random wheel game */
.modal-card:has(.random-wheel-game){width:min(1120px,100%)}.random-wheel-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:18px}.random-wheel-head h2{margin:0 0 7px;font-size:26px}.random-wheel-head p{margin:0;color:var(--muted)}.random-wheel-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:26px;align-items:start}.wheel-stage{position:relative;display:flex;flex-direction:column;align-items:center;padding:20px 16px 4px;overflow:hidden}.random-wheel{width:min(520px,100%);aspect-ratio:1/1;border-radius:50%;filter:drop-shadow(0 15px 25px rgba(24,58,116,.18));will-change:transform}.random-wheel svg{width:100%;height:100%;display:block}.wheel-pointer{position:absolute;z-index:5;top:5px;left:50%;width:0;height:0;transform:translateX(-50%);border-left:20px solid transparent;border-right:20px solid transparent;border-top:48px solid #f59e0b;filter:drop-shadow(0 4px 3px rgba(86,56,0,.24))}.wheel-pointer:after{content:'';position:absolute;left:-7px;top:-45px;width:14px;height:14px;border-radius:50%;background:#fff4cf}.wheel-result{width:min(420px,92%);margin:-2px auto 13px;padding:12px 17px;border:1px solid #dbe5f4;border-radius:12px;background:#fff;text-align:center;box-shadow:0 8px 22px rgba(31,71,136,.08)}.wheel-result span,.wheel-result strong{display:block}.wheel-result span{color:var(--muted);font-size:9px;text-transform:uppercase;letter-spacing:.1em;font-weight:800}.wheel-result strong{margin-top:4px;color:var(--blue-dark);font-size:16px}.wheel-start{min-width:185px}.wheel-start:disabled{opacity:.75;cursor:wait}.wheel-settings{padding:20px;border:1px solid var(--line);border-radius:15px;background:#f8fbff}.wheel-settings label{display:block;font-size:12px;font-weight:700}.wheel-settings label>span{float:right;color:var(--muted);font-size:9px;font-weight:500}.wheel-settings textarea{width:100%;min-height:290px;margin-top:9px;padding:12px;border:1px solid #d7e2f3;border-radius:10px;background:#fff;color:var(--ink);line-height:1.65;resize:vertical;outline:none}.wheel-settings textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(37,99,235,.1)}.wheel-settings>small{display:block;margin:9px 0 15px;color:var(--muted);font-size:9px;line-height:1.55}.wheel-settings>.btn{width:100%}
@media(max-width:850px){.random-wheel-layout{grid-template-columns:1fr}.wheel-settings{order:-1}.wheel-settings textarea{min-height:150px}.random-wheel{width:min(470px,100%)}}@media(max-width:520px){.random-wheel-head{align-items:flex-start;flex-direction:column}.wheel-stage{padding-left:0;padding-right:0}.wheel-pointer{border-left-width:15px;border-right-width:15px;border-top-width:38px}.wheel-result{width:100%}}

/* Account import validation report */
.modal-card:has(.import-report){width:min(820px,100%)}.import-summary{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:20px 0}.import-summary>div{padding:14px;border:1px solid var(--line);border-radius:11px;background:#f8fbff}.import-summary strong,.import-summary span{display:block}.import-summary strong{font-size:22px;color:var(--ink)}.import-summary span{margin-top:4px;color:var(--muted);font-size:9px}.import-summary .success strong{color:#078052}.import-summary .failed strong{color:var(--red)}.import-issue-head{display:flex;align-items:center;justify-content:space-between;margin:20px 0 9px}.import-issue-head span{color:var(--muted);font-size:9px}.import-issue-list{max-height:330px;overflow:auto;border:1px solid var(--line);border-radius:12px}.import-issue{display:grid;grid-template-columns:72px 1fr;gap:12px;padding:12px 14px;border-bottom:1px solid var(--line);background:#fff}.import-issue:last-child{border-bottom:0}.import-issue>span{align-self:start;padding:5px 7px;border-radius:7px;background:#fff0f0;color:var(--red);font-size:9px;font-weight:800;text-align:center}.import-issue.warning>span{background:#fff7df;color:#936000}.import-issue strong{font-size:11px}.import-issue p{margin:4px 0 0;color:#5b6c87;font-size:10px;line-height:1.55}.import-report-actions{display:flex;justify-content:flex-end;gap:9px;margin-top:18px}.import-success-message{padding:15px;border-radius:10px;background:#eaf9f3;color:#087553;font-size:11px}.import-form-error{display:flex;flex-direction:column;gap:4px;margin:14px 0;padding:12px 14px;border:1px solid #f3c7c7;border-radius:10px;background:#fff3f3;color:#a33}.import-form-error strong{font-size:11px}.import-form-error span{font-size:10px;line-height:1.55}
@media(max-width:600px){.import-summary{grid-template-columns:repeat(2,1fr)}.import-issue{grid-template-columns:62px 1fr}.import-report-actions{flex-direction:column}.import-report-actions .btn{width:100%}}
.user-mini[data-profile]{cursor:pointer;border-radius:10px;padding:5px;margin-left:-5px;transition:.2s}.user-mini[data-profile]:hover{background:rgba(255,255,255,.1)}
.table-gear{width:36px;height:36px;border:1px solid var(--line);border-radius:9px;background:#fff;color:#596b88;display:grid;place-items:center;cursor:pointer;font-size:16px;transition:.2s}.table-gear:hover{color:#fff;background:var(--blue);border-color:var(--blue);transform:rotate(25deg)}.user-settings-head{display:flex;align-items:center;gap:13px;margin:17px 0}.user-settings-head .avatar{width:48px;height:48px;font-size:15px}.user-settings-head h2{margin:0!important}.user-settings-head p{margin:4px 0 0;color:var(--muted);font-size:11px}.user-settings-status{display:flex;align-items:center;justify-content:space-between;padding:13px 15px;border-radius:11px;background:#f7f9fd;margin:16px 0}.user-settings-status>span{font-size:11px;color:var(--muted)}.user-settings-actions{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding-top:18px;border-top:1px solid var(--line)}
@media(max-width:600px){.user-settings-actions{grid-template-columns:1fr}.user-settings-actions .btn{width:100%}}

/* Simplified notification palette */
.notification-bell{border:1px solid var(--line);border-radius:10px;box-shadow:none}.notification-bell:hover,.notification-bell[aria-expanded=true]{background:var(--blue-soft);border-color:#b8cced}.notification-panel,.notification-panel.admin-panel{border:1px solid var(--line);background:#fff;box-shadow:0 14px 36px rgba(25,54,102,.14)}.notification-panel-head,.admin-panel .notification-panel-head{background:#fff;border-bottom:1px solid var(--line)}.notification-panel-head strong,.admin-panel .notification-panel-head strong{color:var(--ink)}.notification-entry,.notification-entry.admin-entry{background:#fff;border-left:0}.notification-entry.unread,.notification-entry.admin-entry.unread{background:#f3f7fd;border-left:3px solid var(--blue)}.notification-entry-icon,.admin-entry .notification-entry-icon{background:var(--blue-soft);color:var(--blue)}.notification-entry-title em{background:#e7effd;color:var(--blue);font-size:7px}.admin-panel .notification-show-all,.notification-show-all{background:#f8fbff;color:var(--blue)}.admin-panel .notification-show-all:hover,.notification-show-all:hover{background:#edf4ff}
.paste-uploading,.paste-upload-error{display:inline-block;padding:7px 10px;border-radius:8px;font-size:11px;font-weight:600}.paste-uploading{background:var(--blue-soft);color:var(--blue)}.paste-upload-error{background:#fff1f1;color:var(--red)}

/* Essay grading */
.grade-pill{display:inline-flex;align-items:center;padding:5px 9px;border-radius:8px;background:var(--blue-soft);color:var(--blue);font-size:11px;font-weight:800;white-space:nowrap}.status-waiting,.badge.waiting,.essay-status.waiting{display:inline-flex;align-items:center;padding:5px 9px;border-radius:8px;background:#fff7df;color:#946200;font-size:10px;font-weight:800}.grade-form{display:grid;grid-template-columns:180px minmax(260px,1fr) auto;align-items:end;gap:12px;margin-top:20px;padding:16px;border:1px solid var(--line);border-radius:13px;background:#f8fbff}.grade-form label{margin:0;font-size:12px;font-weight:700}.grade-form label span{color:var(--muted);font-size:10px;font-weight:500}.grade-form input,.grade-form textarea{display:block;width:100%;margin-top:8px;min-height:42px;padding:9px 12px;border:1px solid #d6e0ef;border-radius:9px;background:#fff;color:var(--ink);font-weight:600;resize:vertical}.grade-form textarea{min-height:74px}.grade-form .btn{min-height:42px}.student-grade{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:16px 0;padding:14px 16px;border:1px solid #cbdcf8;border-radius:12px;background:var(--blue-soft)}.student-grade span{color:#526581;font-size:12px;font-weight:600}.student-grade strong{color:var(--blue);font-size:24px}.student-grade small{margin-left:2px;font-size:11px;color:var(--muted)}.essay-status.waiting{margin:14px 0}.teacher-feedback{margin:-6px 0 16px;padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:#fff}.teacher-feedback strong{font-size:11px;color:var(--blue)}.teacher-feedback p{margin:7px 0 0;color:#4f607b;font-size:12px;line-height:1.65}
@media(max-width:800px){.grade-form{grid-template-columns:1fr}.grade-form .btn{width:100%}}

/* Personal profile */
.avatar,.profile-avatar,.profile-form-avatar{position:relative;overflow:hidden;aspect-ratio:1/1;line-height:1}.avatar{flex:0 0 36px;min-width:36px;min-height:36px;max-width:36px;max-height:36px}.table-user .avatar{flex-basis:34px;min-width:34px;min-height:34px;max-width:34px;max-height:34px}.avatar img,.profile-avatar img,.profile-form-avatar img{position:absolute;inset:0;width:100%!important;height:100%!important;max-width:none!important;max-height:none!important;display:block;object-fit:cover;object-position:50% 50%;border-radius:0}.top-profile-link{border:0;background:transparent;color:var(--ink);font-weight:700;cursor:pointer;padding:7px 5px;border-radius:8px}.top-profile-link:hover{color:var(--blue);background:var(--blue-soft)}.optional{float:right;color:var(--muted);font-size:9px;font-weight:500}.table-school{display:inline-block;max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:11px}.profile-shell{max-width:1120px;margin:0 auto}.profile-cover{height:245px;position:relative;overflow:hidden;border-radius:20px 20px 0 0;background:linear-gradient(125deg,#123b86,#2563eb 60%,#79a8ff)}.profile-cover-pattern{position:absolute;inset:0;background:radial-gradient(circle at 18% 28%,rgba(255,255,255,.2) 0 3px,transparent 4px),radial-gradient(circle at 84% 38%,rgba(255,255,255,.13) 0 85px,transparent 86px);background-size:32px 32px,auto}.profile-main{position:relative;min-height:126px;padding:0 34px 22px 220px;display:flex;align-items:flex-end;justify-content:space-between;gap:22px;background:#fff;border:1px solid var(--line);border-top:0;border-radius:0 0 18px 18px}.profile-identity{display:flex;align-items:flex-end;gap:18px}.profile-avatar{position:absolute;left:35px;bottom:22px;width:160px!important;height:160px!important;min-width:160px;min-height:160px;max-width:160px;max-height:160px;flex:0 0 160px;border:6px solid #fff;border-radius:50%;display:grid;place-items:center;background:#dce9ff;color:#1e4ca6;font-size:40px;font-weight:800;box-shadow:0 5px 22px rgba(20,43,82,.18)}.profile-identity h1{margin:0 0 5px;font-size:27px}.profile-identity p{margin:0;color:var(--muted)}.profile-actions{display:flex;gap:9px;flex-wrap:wrap}.profile-columns{display:grid;grid-template-columns:360px 1fr;gap:18px;margin-top:18px}.profile-about h3{margin:0 0 17px}.profile-info-row{display:grid;grid-template-columns:34px 1fr;gap:10px;align-items:center;padding:11px 0;border-bottom:1px solid #edf1f7}.profile-info-row:last-child{border-bottom:0}.profile-info-row i{width:32px;height:32px;border-radius:9px;display:grid;place-items:center;background:var(--blue-soft);color:var(--blue);font-style:normal;font-weight:700}.profile-info-row span{color:var(--muted);font-size:10px}.profile-info-row strong{display:block;margin-top:3px;color:var(--ink);font-size:12px}.profile-welcome{min-height:230px;display:flex;flex-direction:column;justify-content:center;background:linear-gradient(145deg,#fff,#f3f7ff)}.profile-welcome h2{margin:0 0 10px}.profile-welcome p{max-width:570px;color:var(--muted);line-height:1.7}.profile-edit-avatar{display:flex;align-items:center;gap:16px;margin:8px 0 5px}.profile-form-avatar{width:76px!important;height:76px!important;min-width:76px;min-height:76px;max-width:76px;max-height:76px;flex:0 0 76px;border-radius:50%;display:grid;place-items:center;background:#dce9ff;color:#1e4ca6;font-size:20px;font-weight:800}.profile-edit-avatar label{flex:1;margin:0!important}.profile-edit-avatar small{display:block;margin-top:5px;color:var(--muted);font-size:9px;font-weight:400}
.user-settings-head .avatar{flex-basis:48px;min-width:48px;min-height:48px;max-width:48px;max-height:48px}.leader-row .avatar{flex-basis:36px}.sidebar-foot .avatar{flex-basis:36px}
@media(max-width:800px){.profile-cover{height:180px}.profile-main{padding:75px 20px 20px;align-items:flex-start;flex-direction:column}.profile-avatar{width:130px!important;height:130px!important;min-width:130px;min-height:130px;max-width:130px;max-height:130px;flex-basis:130px;left:20px;bottom:auto;top:-65px}.profile-columns{grid-template-columns:1fr}.profile-actions{width:100%}.profile-actions .btn{flex:1}}@media(max-width:520px){.profile-cover{height:145px}.profile-main{padding-top:72px}.profile-identity h1{font-size:22px}.profile-actions{flex-direction:column}.profile-actions .btn{width:100%}}
.activity-card.bulletin .activity-top{background:#0f75bc}.activity-card.bulletin .activity-type i{background:#e7f3ff;color:#0f65a5}.bulletin-summary{color:var(--muted);font-size:15px;line-height:1.65;margin:8px 0 20px}.bulletin-content{padding:22px;border:1px solid var(--line);border-radius:14px;background:#fbfdff;line-height:1.75;min-height:130px;overflow-wrap:anywhere}.bulletin-content img{display:block;max-width:100%;height:auto;border-radius:10px;margin:14px 0}.bulletin-content a{color:var(--blue)}.bulletin-foot{display:flex;align-items:center;justify-content:space-between;gap:15px;padding-top:18px;margin-top:18px;border-top:1px solid var(--line);color:var(--muted)}
.user-filter-bar{display:grid;grid-template-columns:minmax(260px,1.5fr) repeat(3,minmax(150px,.7fr)) auto;gap:10px;padding:13px;margin-bottom:12px;border:1px solid var(--line);border-radius:13px;background:#fff}.user-filter-bar input,.user-filter-bar select{width:100%;height:40px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--ink);padding:0 11px;outline:none}.user-filter-bar input:focus,.user-filter-bar select:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(37,99,235,.09)}.user-search{position:relative}.user-search>span{position:absolute;left:12px;top:8px;color:var(--muted);font-size:18px}.user-search input{padding-left:36px}.user-filter-bar .btn{height:40px}.user-empty{padding:35px 15px}@media(max-width:1100px){.user-filter-bar{grid-template-columns:repeat(2,minmax(0,1fr))}.user-search{grid-column:span 2}}@media(max-width:650px){.user-filter-bar{grid-template-columns:1fr}.user-search{grid-column:auto}.user-filter-bar .btn{width:100%}}
/* Question bank and quiz */
.question-bank-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:22px}.question-bank-head h2{margin:5px 0 0}.question-bank-head>div:last-child{display:flex;gap:10px}.question-bank-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:18px;align-items:start}.question-folder-panel,.question-bank-content,.leaderboard-shell{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 12px 32px rgba(31,71,136,.06)}.question-folder-panel{padding:13px;position:sticky;top:90px}.panel-title{display:flex;align-items:center;justify-content:space-between;padding:7px 8px 12px}.panel-title button{width:30px;height:30px;border:0;border-radius:9px;background:var(--blue-soft);color:var(--blue);font-weight:800;cursor:pointer}.question-folder{width:100%;border:0;background:transparent;border-radius:11px;padding:10px;display:grid;grid-template-columns:26px 1fr 28px;gap:8px;align-items:center;text-align:left;color:var(--ink);cursor:pointer}.question-folder:hover,.question-folder.active{background:#edf4ff;color:var(--blue)}.question-folder div{display:grid;gap:2px}.question-folder small{color:var(--muted);font-size:10px}.question-folder i{font-style:normal;text-align:center}.question-bank-content{padding:18px}.question-toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);padding-bottom:15px;margin-bottom:15px}.question-toolbar>div{display:flex;gap:10px;align-items:baseline}.question-toolbar span{font-size:11px;color:var(--muted)}.question-toolbar input{max-width:320px}.question-bank-item{display:grid;grid-template-columns:36px minmax(0,1fr) auto;gap:14px;padding:17px 0;border-bottom:1px solid var(--line)}.question-bank-item:last-child{border-bottom:0}.question-index{width:32px;height:32px;border-radius:9px;background:var(--blue-soft);color:var(--blue);display:grid;place-items:center;font-weight:800}.question-bank-meta{display:flex;gap:8px;align-items:center;font-size:10px;color:var(--muted)}.question-preview{margin:10px 0;font-weight:650}.question-options-preview{display:flex;flex-wrap:wrap;gap:7px}.question-options-preview span{padding:6px 9px;background:#f5f7fb;border-radius:8px;font-size:11px}.question-options-preview .correct{background:#e8f8ef;color:#167448}.question-bank-actions{display:flex;gap:6px}.question-option-head{display:flex;align-items:center;justify-content:space-between;margin:18px 0 9px}.question-option-row{display:grid;grid-template-columns:34px minmax(0,1fr) 125px 32px;gap:8px;align-items:center;margin-bottom:8px}.question-option-row>span{width:32px;height:32px;border-radius:9px;background:var(--blue-soft);color:var(--blue);display:grid;place-items:center;font-weight:800}.question-option-row>label{font-size:11px}.question-option-row>button{border:0;background:#fff0f0;color:#d84747;border-radius:8px;height:32px;cursor:pointer}.quiz-question-form{display:grid;gap:14px}.aiken-input{min-height:300px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.aiken-summary{display:flex;gap:12px;padding:11px;background:#f2f6fd;border-radius:10px}.aiken-error{color:#b42335;font-size:11px}.quiz-folder-select{border:1px solid var(--line);border-radius:13px;padding:13px;display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.quiz-folder-select label{display:flex;align-items:center;gap:7px;padding:9px;background:#f7f9fd;border-radius:9px}.quiz-folder-select small{margin-left:auto;color:var(--muted)}.quiz-settings-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.quiz-settings-grid label{display:flex;align-items:center;gap:7px;background:#f7f9fd;padding:10px;border-radius:9px}.quiz-player{min-width:min(900px,88vw)}.quiz-player-head{display:flex;justify-content:space-between;align-items:flex-start;gap:20px}.quiz-player-head h2{margin:5px 0}.quiz-clock{min-width:125px;text-align:center;background:#edf4ff;border-radius:13px;padding:10px;color:var(--blue)}.quiz-clock strong,.quiz-clock span{display:block}.quiz-clock strong{font-size:22px}.quiz-clock span{font-size:9px;text-transform:uppercase}.quiz-progress{height:6px;background:#e9eef7;border-radius:8px;overflow:hidden;margin:15px 0 20px}.quiz-progress i{display:block;height:100%;background:var(--blue);transition:.2s}.quiz-question{padding:18px;border:1px solid var(--line);border-radius:15px;margin-bottom:13px}.quiz-question-title{display:flex;justify-content:space-between;color:var(--blue);font-weight:800;margin-bottom:11px}.quiz-question-title small{color:var(--muted)}.quiz-options{display:grid;gap:9px;margin-top:15px}.quiz-options label{cursor:pointer}.quiz-options input{position:absolute;opacity:0}.quiz-options span{display:flex;align-items:center;gap:10px;padding:12px;border:1px solid var(--line);border-radius:11px;transition:.15s}.quiz-options b{width:28px;height:28px;border-radius:8px;background:#edf2fa;display:grid;place-items:center}.quiz-options input:checked+span{border-color:var(--blue);background:#edf4ff;color:#164fa8}.quiz-options input:checked+span b{background:var(--blue);color:#fff}.quiz-player-actions,.quiz-result-actions{display:flex;justify-content:space-between;gap:10px;margin-top:18px}.quiz-result{text-align:center}.quiz-result-icon{width:64px;height:64px;border-radius:50%;background:#e8f8ef;color:#16834c;display:grid;place-items:center;font-size:28px;margin:0 auto 13px}.quiz-score{padding:18px;background:#f4f7fc;border-radius:15px;margin:18px 0}.quiz-score strong{display:block;color:var(--blue);font-size:42px}.quiz-score small{font-size:18px}.quiz-score span{color:var(--muted)}.quiz-review{text-align:left;margin-top:22px;max-height:430px;overflow:auto}.quiz-review>div{border-top:1px solid var(--line);padding:14px 0}.quiz-review p{padding:8px;border-radius:8px}.quiz-review p.correct{background:#e8f8ef}.quiz-review p.wrong{background:#fff0f0}.leaderboard-shell{padding:22px}.quiz-leader-head,.quiz-leader-row{display:grid;grid-template-columns:70px minmax(180px,1fr) 100px 120px 135px;gap:10px;align-items:center}.quiz-leader-head{padding:10px 14px;color:var(--muted);font-size:10px;text-transform:uppercase;font-weight:800}.quiz-leader-row{padding:13px 14px;border:1px solid var(--line);border-radius:11px;margin-top:7px}.quiz-leader-row.rank-1{background:#fff9e7;border-color:#edca62}.quiz-leader-row.rank-2{background:#f6f8fc}.quiz-leader-row.rank-3{background:#fff5ef}.quiz-leader-row b{font-size:20px;text-align:center}.quiz-leader-row span{color:var(--blue);font-weight:800}.quiz-leader-row em{font-style:normal}.quiz-leader-row small{color:var(--muted)}
.modal-card:has(.quiz-player),.modal-card:has(.quiz-question-form),.modal-card:has(#quizActivityForm){width:min(980px,100%)}
@media(max-width:900px){.question-bank-layout{grid-template-columns:1fr}.question-folder-panel{position:static}.quiz-settings-grid{grid-template-columns:1fr 1fr}.quiz-leader-head,.quiz-leader-row{grid-template-columns:45px 1fr 65px}.quiz-leader-head span:nth-child(n+4),.quiz-leader-row em,.quiz-leader-row small{display:none}.question-bank-item{grid-template-columns:32px 1fr}.question-bank-actions{grid-column:2}}
@media(max-width:600px){.question-bank-head{align-items:stretch;flex-direction:column}.question-bank-head>div:last-child{display:grid;grid-template-columns:1fr 1fr}.quiz-folder-select,.quiz-settings-grid{grid-template-columns:1fr}.question-option-row{grid-template-columns:30px 1fr 30px}.question-option-row>label{grid-column:2}.quiz-player{min-width:0}.quiz-player-head{display:block}.quiz-clock{margin-top:10px}.quiz-result-actions{flex-direction:column}}