:root{--bg:#f5f7fb;--panel:#fff;--text:#1d2433;--muted:#6b7280;--primary:#4355b9;--accent:#7c4dbe;--primary2:#eef0ff;--border:#e5e7eb;--danger:#c62828;--warn:#a16207;--success:#16803a;--shadow:0 12px 32px rgba(31,41,55,.08)}*{box-sizing:border-box}body{margin:0;font-family:Inter,Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--text)}button,input,textarea,select{font:inherit}.hidden{display:none!important}.offline-banner{background:#20263a;color:white;text-align:center;padding:10px 16px;font-size:14px}.app-shell{min-height:100vh;display:grid;grid-template-columns:260px 1fr}.sidebar{background:#f9faff;border-right:1px solid var(--border);padding:22px 16px;display:flex;flex-direction:column;position:sticky;top:0;height:100vh}.brand{display:flex;align-items:center;gap:12px;padding:0 8px 18px}.brand-mark{width:42px;height:42px;border-radius:12px;background:var(--primary);color:white;display:grid;place-items:center;font-weight:800}.brand strong,.brand span{display:block}.brand span{font-size:12px;color:var(--muted);margin-top:2px}.role-switch{display:grid;grid-template-columns:1fr 1fr;background:#eceffa;border-radius:12px;padding:4px;margin-bottom:18px}.role-btn{border:0;background:transparent;padding:9px;border-radius:9px;cursor:pointer}.role-btn.active{background:white;color:var(--primary);box-shadow:0 2px 7px rgba(0,0,0,.08);font-weight:700}.nav-list{display:flex;flex-direction:column;gap:5px}.nav-item{border:0;background:transparent;text-align:left;padding:12px;border-radius:10px;color:#4b5563;cursor:pointer}.nav-item:hover,.nav-item.active{background:var(--primary2);color:var(--primary);font-weight:700}.sidebar-footer{margin-top:auto;display:grid;gap:10px;color:var(--muted);font-size:12px;padding:10px 6px}.install-btn{border:0;border-radius:10px;padding:10px;background:var(--primary);color:white;cursor:pointer}.main-content{min-width:0}.topbar{height:86px;background:white;border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 28px;gap:18px;position:sticky;top:0;z-index:5}.topbar h1{font-size:20px;margin:0}.topbar p{font-size:13px;color:var(--muted);margin:4px 0 0}.top-actions{margin-left:auto;display:flex;align-items:center;gap:12px}.icon-btn{border:1px solid var(--border);background:white;width:40px;height:40px;border-radius:10px;cursor:pointer}.avatar{width:40px;height:40px;border-radius:50%;background:var(--primary2);color:var(--primary);display:grid;place-items:center;font-weight:800}.page{display:none;padding:28px;max-width:1500px;margin:auto}.active-page{display:block}.hero{background:linear-gradient(120deg,var(--primary),var(--accent));color:white;border-radius:22px;padding:28px;display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px}.hero h2{font-size:28px;margin:5px 0}.hero p{margin:0;color:#e9eaff}.eyebrow{font-size:12px;letter-spacing:.14em}.hero-badge{background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.24);border-radius:18px;padding:18px 24px;text-align:center}.hero-badge strong,.hero-badge span{display:block}.hero-badge strong{font-size:30px}.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:18px 0}.metric{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:18px}.metric span,.metric strong,.metric small{display:block}.metric span{font-size:13px;color:var(--muted)}.metric strong{font-size:24px;margin:8px 0}.metric small{color:var(--muted)}.grid-2{display:grid;grid-template-columns:1.3fr 1fr;gap:18px;margin:18px 0}.panel{background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:20px;box-shadow:var(--shadow)}.panel-head,.section-intro{display:flex;justify-content:space-between;align-items:center;gap:14px}.panel-head h3,.section-intro h2{margin:0}.section-intro{margin-bottom:18px}.section-intro p{margin:5px 0 0;color:var(--muted)}.text-btn{border:0;background:transparent;color:var(--primary);cursor:pointer}.primary{border:0;background:var(--primary);color:white;border-radius:10px;padding:11px 16px;cursor:pointer}.lesson-card,.event,.list-card{display:flex;align-items:center;gap:15px;padding:16px;border:1px solid var(--border);border-radius:14px;margin-top:12px}.featured{background:#fbfbff}.lesson-icon{font-size:30px}.grow{flex:1}.lesson-card h3,.lesson-card p{margin:4px 0}.lesson-card p,.event small,.list-card p{color:var(--muted)}.chip,.tag{display:inline-block;border-radius:999px;padding:4px 9px;background:var(--primary2);color:var(--primary);font-size:12px}.tag.warn{background:#fff4d6;color:var(--warn)}.tag.danger{background:#ffe7e7;color:var(--danger)}.tag.success{background:#e6f7eb;color:var(--success)}.progress{height:8px;background:#e9ebf3;border-radius:10px;overflow:hidden;margin-top:10px}.progress i{display:block;height:100%;background:var(--primary)}.date-box{min-width:52px;height:55px;border:1px solid var(--border);border-radius:10px;display:grid;place-items:center;font-size:10px;color:var(--muted)}.date-box b{font-size:18px;color:var(--text)}.event div{flex:1}.event strong,.event small{display:block}.announcement-preview{padding:14px 0;border-top:1px solid var(--border);display:flex;align-items:center;gap:13px}.announcement-preview:first-child{border-top:0}.announcement-preview-copy{min-width:0;flex:1}.announcement-preview h4{margin:0 0 5px}.announcement-preview p{margin:0;color:var(--muted);font-size:13px}.mini-date{flex:0 0 52px;height:54px;border:1px solid var(--border);border-radius:13px;background:var(--primary2);display:grid;place-items:center;align-content:center;line-height:1;box-shadow:0 4px 12px rgba(31,41,55,.06)}.mini-date span{font-size:10px;letter-spacing:.08em;color:var(--primary);font-weight:800;margin-bottom:4px}.mini-date b{font-size:20px;color:var(--text)}.list-card{background:white}.list-card .meta{font-size:12px;color:var(--muted)}.list-card h3{margin:4px 0}.card-list{display:grid;gap:12px}.action-right{margin-left:auto}.disabled{opacity:.55;cursor:not-allowed}.calendar-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:8px}.calendar-day{background:white;border:1px solid var(--border);border-radius:12px;min-height:115px;padding:10px}.calendar-day b{font-size:13px}.calendar-day .cal-event{font-size:11px;background:var(--primary2);color:var(--primary);padding:5px;border-radius:7px;margin-top:7px}.settings-panel{display:grid;gap:15px}.setting{display:flex;gap:10px}.editor-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.form-panel{display:grid;gap:14px}.form-panel label{display:grid;gap:6px;font-weight:600}.form-panel input,.form-panel textarea,.form-panel select{width:100%;border:1px solid var(--border);border-radius:10px;padding:11px;background:white}.compact-list{display:grid;gap:10px}.compact-item{padding:12px;border:1px solid var(--border);border-radius:10px}.compact-item strong,.compact-item small{display:block}.compact-item small{color:var(--muted);margin-top:4px}.activity-row{display:flex;justify-content:space-between;border-top:1px solid var(--border);padding:14px 0}.quick-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.quick-grid button{border:1px solid var(--border);background:white;border-radius:12px;padding:18px;cursor:pointer}.empty-state{text-align:center;background:white;border:1px solid var(--border);border-radius:18px;padding:60px 20px}.empty-state span{font-size:44px}.student-row{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:12px;padding:13px;border-top:1px solid var(--border)}.student-row.header{font-weight:700;background:#fafafa;border-radius:10px;border-top:0}.student-row small{color:var(--muted)}dialog{border:0;border-radius:20px;max-width:760px;width:calc(100% - 32px);padding:28px;box-shadow:0 30px 80px rgba(0,0,0,.24)}dialog::backdrop{background:rgba(12,18,35,.65)}.dialog-close{float:right;border:0;background:#eee;width:36px;height:36px;border-radius:50%;font-size:22px;cursor:pointer}.reader-content{line-height:1.75;margin:20px 0;white-space:pre-wrap}.toast{position:fixed;right:20px;bottom:20px;background:#20263a;color:white;padding:12px 18px;border-radius:10px;opacity:0;pointer-events:none;transform:translateY(10px);transition:.25s}.toast.show{opacity:1;transform:none}#menuBtn{display:none}@media(max-width:1000px){.metrics{grid-template-columns:repeat(2,1fr)}.grid-2,.editor-grid{grid-template-columns:1fr}.app-shell{grid-template-columns:220px 1fr}}@media(max-width:760px){.app-shell{display:block}.sidebar{position:fixed;left:-280px;width:260px;z-index:20;transition:.25s;box-shadow:10px 0 30px rgba(0,0,0,.15)}.sidebar.open{left:0}.topbar{padding:0 16px}.page{padding:18px}.metrics{grid-template-columns:1fr 1fr}.hero{align-items:flex-start;flex-direction:column}.hero h2{font-size:24px}.panel-head,.section-intro{align-items:flex-start;flex-direction:column}.calendar-grid{grid-template-columns:repeat(2,1fr)}#menuBtn{display:block}.lesson-card,.event,.list-card{align-items:flex-start;flex-wrap:wrap}.action-right{margin-left:0;width:100%}.action-right button{width:100%}.student-row{grid-template-columns:1fr 1fr}.student-row.header{display:none}}@media(max-width:430px){.metrics{grid-template-columns:1fr}.calendar-grid{grid-template-columns:1fr}.topbar p{display:none}}

.secondary{border:1px solid var(--border);background:white;color:var(--text);border-radius:10px;padding:11px 16px;cursor:pointer}.brand-logo,.profile-image{width:100%;height:100%;object-fit:cover}.brand-logo{object-fit:contain;padding:4px}.avatar{overflow:hidden}.student-profile-strip{display:flex;align-items:center;justify-content:space-between;gap:16px;background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:12px 16px;margin-bottom:14px}.student-instructor-profile{display:flex;align-items:center;gap:12px}.student-instructor-profile small,.student-instructor-profile strong{display:block}.student-instructor-profile small{color:var(--muted);margin-bottom:3px}.profile-photo{border-radius:50%;background:var(--primary2);color:var(--primary);display:grid;place-items:center;font-weight:800;overflow:hidden;flex:0 0 auto}.profile-photo.large{width:48px;height:48px}.profile-photo.xl{width:84px;height:84px;font-size:24px}.student-school-logos{display:flex;align-items:center;gap:8px}.mini-logo{width:42px;height:42px;object-fit:contain;border:1px solid var(--border);border-radius:10px;padding:4px;background:white}.customize-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.color-field{display:grid;grid-template-columns:1fr 52px;gap:10px;align-items:end}.color-field input[type=color]{width:52px;height:44px;border:1px solid var(--border);border-radius:10px;padding:3px;background:white}.helper-text{color:var(--muted)}.logo-preview-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.upload-preview{min-height:140px;border:1px dashed var(--border);border-radius:14px;display:grid;place-items:center;padding:12px;text-align:center;color:var(--muted)}.upload-preview span,.upload-preview b{display:block}.upload-preview img{max-width:100%;height:82px;object-fit:contain}.profile-editor-head{display:flex;align-items:center;gap:16px}.privacy-note{background:var(--primary2);border-radius:12px;padding:14px;color:var(--primary)}.privacy-note strong,.privacy-note span{display:block}.privacy-note span{margin-top:5px;font-size:13px}.instructor-hero{background:linear-gradient(120deg,var(--primary),var(--accent))}@media(max-width:900px){.customize-grid{grid-template-columns:1fr}}@media(max-width:560px){.student-profile-strip{align-items:flex-start}.student-school-logos{flex-wrap:wrap}.logo-preview-row{grid-template-columns:1fr}.color-field{grid-template-columns:1fr 48px}}

.form-actions{display:flex;gap:10px;flex-wrap:wrap}.lesson-manage-item{display:flex;justify-content:space-between;align-items:center;gap:14px}.lesson-manage-copy{min-width:0;flex:1}.lesson-title-line{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.lesson-manage-actions{display:flex;gap:7px;flex-wrap:wrap;justify-content:flex-end}.lesson-manage-actions button{padding:8px 10px;font-size:12px}.danger-btn{border:1px solid #efb4b4;background:#fff4f4;color:#b42318;border-radius:10px;padding:9px 12px;cursor:pointer}.danger-btn:hover{background:#ffe7e7}.empty-mini{padding:24px;text-align:center;border:1px dashed var(--border);border-radius:12px;color:var(--muted)}@media(max-width:680px){.lesson-manage-item{align-items:flex-start;flex-direction:column}.lesson-manage-actions{width:100%;justify-content:flex-start}.lesson-manage-actions button{flex:1}.form-actions button{flex:1}}

/* Version 4: Subjects and EDP authentication */
.auth-shell{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:stretch;max-width:980px;margin:24px auto}.auth-brand-panel{padding:36px;border-radius:24px;background:linear-gradient(145deg,var(--primary),var(--accent));color:#fff;display:flex;flex-direction:column;justify-content:center;min-height:430px}.auth-brand-panel h2{font-size:2rem;margin:10px 0}.auth-brand-panel p{opacity:.9;line-height:1.7}.auth-brand-panel .privacy-note{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.25);color:#fff}.auth-card{max-width:480px;width:100%;margin:auto}.auth-tabs{display:grid;grid-template-columns:1fr 1fr;background:var(--soft);padding:5px;border-radius:14px;margin-bottom:22px}.auth-tab{border:0;background:transparent;padding:11px;border-radius:10px;font-weight:700;color:var(--muted);cursor:pointer}.auth-tab.active{background:var(--card);color:var(--primary);box-shadow:0 2px 8px rgba(0,0,0,.08)}.wide{width:100%;justify-content:center;margin-top:8px}.subjects-layout{margin-bottom:22px}.roster-panel{margin-top:18px}.roster-toolbar{display:flex;gap:14px;align-items:center;margin:18px 0}.file-drop{border:1px dashed var(--border);border-radius:14px;padding:14px;display:flex!important;flex-direction:column;gap:5px}.file-drop input{margin-top:8px}.file-drop span{font-size:.85rem;color:var(--muted)}.import-summary{padding:13px 15px;border-radius:12px;background:var(--success-soft);margin-bottom:14px;display:flex;gap:8px;flex-wrap:wrap}.roster-row{grid-template-columns:150px 1.6fr 130px 90px}.account-ok{color:#17834d;font-weight:700}.account-wait{color:#a56b00;font-weight:700}.danger-link{border:0;background:none;color:#c0392b;font-weight:700;cursor:pointer}.student-subjects-strip{margin-bottom:18px}.subject-chip-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:12px}.subject-card{border:1px solid var(--border);border-radius:14px;padding:14px;background:var(--card);display:flex;flex-direction:column;gap:4px}.subject-card strong{color:var(--primary)}.subject-card span{font-weight:700}.subject-card small{color:var(--muted)}
@media(max-width:800px){.auth-shell{grid-template-columns:1fr}.auth-brand-panel{min-height:auto;padding:24px}.roster-toolbar{flex-direction:column;align-items:stretch}.roster-row{grid-template-columns:110px 1fr}.roster-row span:nth-child(3),.roster-row span:nth-child(4){margin-top:5px}}

/* v5 assessment scheduling */
button:disabled{opacity:.55;cursor:not-allowed}.form-panel input[type="datetime-local"]{width:100%;box-sizing:border-box}.compact-item .tag+ .tag{margin-left:6px}@media(max-width:700px){.lesson-manage-actions{width:100%;flex-wrap:wrap}.action-right{align-items:flex-start}}

.manual-student-box{margin-top:16px;padding:16px;border:1px solid var(--border);border-radius:16px;background:var(--soft)}
.manual-student-box h4{margin:0 0 4px}
.manual-student-grid{display:grid;grid-template-columns:minmax(150px,.7fr) minmax(260px,1.5fr) auto;gap:12px;align-items:end}
.manual-student-grid .primary{min-height:44px;white-space:nowrap}
@media(max-width:760px){.manual-student-grid{grid-template-columns:1fr}.manual-student-grid .primary{width:100%}}
.roster-subject-picker{display:grid;grid-template-columns:minmax(260px,520px);gap:12px;margin:18px 0}.roster-subject-picker select{width:100%}.manual-student-box{margin-top:18px;padding-top:18px;border-top:1px solid var(--line)}.manual-student-grid{display:grid;grid-template-columns:minmax(180px,.8fr) minmax(260px,1.5fr) auto;gap:12px;align-items:end}.manual-student-grid button{min-height:46px}.roster-panel{margin-top:22px}.roster-panel input:disabled,.roster-panel button:disabled{opacity:.55;cursor:not-allowed}@media(max-width:760px){.manual-student-grid{grid-template-columns:1fr}.roster-toolbar{align-items:stretch}.roster-toolbar>*{width:100%}}

/* v8 dynamic quiz and assignment engine */
.assessment-editor-grid{grid-template-columns:minmax(420px,1.15fr) minmax(340px,.85fr)}
.import-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:-4px}
.question-tools{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:12px 0 8px;padding:12px;border:1px solid var(--border);border-radius:12px;background:var(--soft)}
.question-tools>div{display:flex;gap:7px;flex-wrap:wrap}
.question-tools button{padding:8px 10px}
.question-builder{display:grid;gap:12px;margin-bottom:14px}
.question-card{border:1px solid var(--border);border-radius:15px;padding:14px;background:#fff}
.question-card-head{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:10px}
.question-type-badge{text-transform:uppercase;font-size:11px;font-weight:800;letter-spacing:.05em;color:var(--primary)}
.question-card-grid{display:grid;grid-template-columns:1fr 110px;gap:10px}
.question-card .choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:9px}
.question-actions{display:flex;gap:6px}.question-actions button{padding:6px 9px}
.assessment-dialog{max-width:850px}.student-assessment-form{display:grid;gap:16px;margin:20px 0}
.student-question{padding:16px;border:1px solid var(--border);border-radius:14px;background:var(--soft)}
.student-question h4{margin:0 0 12px}.choice-option{display:flex;align-items:flex-start;gap:9px;padding:8px 0}.choice-option input{margin-top:3px}
.result-box{padding:16px;border-radius:12px;background:var(--success-soft);margin:14px 0}.result-box strong{font-size:20px;display:block;margin-bottom:5px}
.source-attachment{display:flex;gap:10px;align-items:center;padding:12px;border:1px dashed var(--border);border-radius:12px;margin:14px 0}
@media(max-width:900px){.assessment-editor-grid{grid-template-columns:1fr}}@media(max-width:600px){.question-card-grid,.question-card .choice-grid{grid-template-columns:1fr}.question-tools{align-items:flex-start;flex-direction:column}}


/* v8.4: Cute calendar date badges for student announcements */
.announcement-card{align-items:center}
.cute-date-badge{flex:0 0 62px;width:62px;height:66px;border:1px solid color-mix(in srgb,var(--primary) 24%,var(--border));border-radius:16px;overflow:hidden;background:#fff;display:flex;flex-direction:column;align-items:stretch;justify-content:flex-start;box-shadow:0 7px 18px rgba(31,41,55,.09)}
.cute-date-badge span{display:flex;align-items:center;justify-content:center;min-height:23px;padding:4px 5px;background:var(--primary);color:#fff;font-size:10px;font-weight:800;letter-spacing:.12em;line-height:1}
.cute-date-badge b{display:flex;flex:1;align-items:center;justify-content:center;color:var(--text);font-size:23px;line-height:1;font-weight:800}
.cute-date-badge.compact{flex-basis:56px;width:56px;height:60px;border-radius:14px}
.cute-date-badge.compact span{min-height:21px;font-size:9px}
.cute-date-badge.compact b{font-size:21px}
.announcement-preview{min-height:78px}
.announcement-preview-copy h4{line-height:1.25}
@media(max-width:430px){.cute-date-badge{flex-basis:56px;width:56px;height:60px;border-radius:14px}.cute-date-badge span{min-height:21px;font-size:9px}.cute-date-badge b{font-size:21px}.announcement-card{flex-wrap:nowrap}.announcement-card .grow{min-width:0}}

/* Public authentication gateway */
body.public-auth .app-shell{display:block;min-height:100vh}
body.public-auth .sidebar,body.public-auth .topbar{display:none!important}
body.public-auth .main-content{min-height:100vh;display:grid;place-items:center;padding:28px}
body.public-auth .page{width:100%;max-width:1050px;padding:0}
body.student-mode .role-switch,body.instructor-mode .role-switch{display:none!important}
body.student-mode #instructorNav{display:none!important}
body.instructor-mode #studentNav{display:none!important}
@media(max-width:760px){body.public-auth .main-content{padding:16px}body.public-auth .auth-shell{grid-template-columns:1fr}}


/* v8.9.7 public three-way access tabs */
.auth-tabs-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.35rem;}
.auth-tabs-three .auth-tab{padding:.85rem .5rem;font-size:.92rem;}
@media (max-width:640px){.auth-tabs-three{grid-template-columns:1fr;}.auth-tabs-three .auth-tab{width:100%;}}