/* Onlinedars Studio: one visual language across the learning workspace. */
:root{--brand:#0f766e;--accent:#0f766e;--muted:#5d6d81;--studio-navy:#102139;--studio-ink:#182d43;--studio-teal:#0f766e;--studio-line:#e1e8ef;--studio-paper:#f5f7fb;font-family:"Segoe UI Variable","Segoe UI",system-ui,-apple-system,sans-serif;color:var(--studio-ink);background:var(--studio-paper)}
body{background:var(--studio-paper);color:var(--studio-ink)}
.studio-shell{min-height:100vh;isolation:isolate;color:var(--studio-ink);font-size:15px;line-height:1.6}
.studio-shell h1,.studio-shell h2,.studio-shell h3{color:#182d43;letter-spacing:-.035em;font-weight:750;line-height:1.22}
.studio-shell h1{font-size:clamp(1.55rem,2.3vw,2.12rem)}.studio-shell h2{font-size:1.22rem}.studio-shell h3{font-size:1.02rem;letter-spacing:-.018em}
.studio-shell p{line-height:1.7}.studio-shell small,.studio-shell .muted{color:#5d6d81}.studio-shell .eyebrow{color:#0d736b;font-size:10px;font-weight:800;letter-spacing:.16em}
.studio-shell button{border-radius:11px;font-weight:650;transition:background-color .16s,color .16s,box-shadow .16s,transform .16s}
.studio-shell button:disabled{transform:none}.studio-shell a{color:#086d67}.studio-shell button:focus-visible,.studio-shell a:focus-visible,.studio-shell input:focus-visible,.studio-shell select:focus-visible,.studio-shell textarea:focus-visible,.studio-shell summary:focus-visible{outline:3px solid #0f766e;outline-offset:3px}
.studio-shell button.secondary{background:#edf3f6;color:#344e65}.studio-shell button.danger{background:#b6364b;color:#fff}.studio-shell button:hover{filter:brightness(1.035)}
.studio-shell input,.studio-shell select,.studio-shell textarea{border-color:#d3dfe8;border-radius:10px;background:#fcfdff;color:#223b51;box-shadow:0 1px 2px #1c355603;min-width:0}
.studio-shell input:not([type=checkbox]):not([type=radio]),.studio-shell select{min-height:44px}.studio-shell input[type=checkbox],.studio-shell input[type=radio]{accent-color:#0f766e;box-shadow:none}.studio-shell input::placeholder,.studio-shell textarea::placeholder{color:#65758a;opacity:1}.studio-shell label{font-size:.83rem;color:#344b61;font-weight:650}.studio-shell textarea{line-height:1.7}
.studio-shell .panel{border:1px solid var(--studio-line);border-radius:17px;background:#fff;box-shadow:0 5px 24px #16345104;padding:24px;margin-bottom:20px}.studio-shell .grid{gap:20px}.studio-shell .actions{gap:10px}.studio-shell .badge{border-radius:7px;background:#edf3f7;color:#41596e;font-weight:650;font-size:11px}.studio-shell .warning{background:#fff8e9;border-color:#ead7a9;color:#76561e;border-radius:12px}.studio-shell .error{border-radius:12px}.studio-shell .stat{color:#0f766e}
.studio-shell .has-nav .workspace{margin-left:232px}.studio-shell .workspace{min-height:100vh;min-width:0;background:radial-gradient(ellipse at 92% 3%,#e8f3f140,transparent 46%),#f5f7fb}
.studio-shell .workspace>main.wrap{max-width:1680px;padding:30px 34px 36px;min-width:0}.studio-shell .workspace>main:focus{outline:none}.studio-shell .workspace>footer{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:20px 34px 26px;border-top:1px solid #e6edf2;font-size:11px;color:#627589}.studio-shell .workspace>footer>span:first-child{font-weight:800;letter-spacing:.02em;color:#264358}
.studio-skip{position:fixed;top:10px;left:250px;z-index:100;padding:12px 18px;border-radius:9px;background:#fff;color:#0b6b62;box-shadow:0 4px 24px #0b263b33;transform:translateY(-170%);font-weight:700}.studio-skip:focus{transform:translateY(0)}
.studio-shell .global-nav{position:fixed;inset:0 auto 0 0;width:232px;display:flex;flex-direction:column;align-items:stretch;gap:0;background:#102139;color:#dce7ef;padding:26px 15px 18px;border:0;z-index:25;overflow-y:auto;scrollbar-width:thin;scrollbar-color:#395065 #102139;border-radius:0;margin:0}
.studio-shell .rail-brand{display:flex;flex-direction:row;align-items:center;gap:11px;margin:0 0 25px;padding:0 5px;flex-shrink:0}.studio-shell .rail-brand>b{display:grid;place-items:center;width:43px;height:48px;border:0;border-radius:13px;background:#ffffff0b;color:#eefbf7;line-height:1;flex-shrink:0}.studio-shell .rail-brand svg{width:34px;height:34px}.studio-shell .rail-brand>span{display:flex;flex-direction:column;gap:2px;min-width:0;letter-spacing:0}.studio-shell .rail-brand strong{font-size:20px;color:#f7fbff;font-weight:750;letter-spacing:-.04em}.studio-shell .rail-brand small{font-size:10px;color:#b2c7d3;font-weight:400;white-space:nowrap}
.studio-shell .studio-nav-section{display:flex;flex-direction:column;gap:3px;margin-bottom:18px}.studio-shell .studio-nav-caption{display:block;padding:0 13px;margin:0 0 9px;color:#a1b6c8;font-size:9px;font-weight:700;letter-spacing:.15em}
.studio-shell .global-nav button{position:relative;display:flex;flex-direction:row;align-items:center;justify-content:flex-start;gap:12px;padding:11px 13px;min-height:44px;background:transparent;color:#c4d2df;border:0;border-radius:10px;font-size:12px;font-weight:500;line-height:1.35;text-align:left;flex-shrink:0;width:100%}
.studio-shell .global-nav button>svg{width:21px;height:21px;flex-shrink:0;opacity:.93}.studio-shell .global-nav button>span.studio-nav-label{font-size:12px;flex:1;min-width:0}.studio-shell .global-nav button.active{background:#1b4d4b;color:#fff;box-shadow:inset 3px 0 #5ad6b4;font-weight:700}.studio-shell .global-nav button:hover{background:#ffffff0b;color:#fff;filter:none}.studio-shell .global-nav button.active:hover{background:#205652}.studio-shell .global-nav button:focus-visible{outline-color:#f2b85a;outline-offset:-2px}
.studio-shell .global-nav .nav-count{position:static;display:grid;place-items:center;min-width:21px;height:21px;line-height:1;margin-left:auto;background:#efbf6d;color:#27374a;border:0;font-size:10px;border-radius:7px;padding:2px 5px;flex-shrink:0}.studio-shell .rail-bottom{display:flex;align-items:center;gap:8px;writing-mode:horizontal-tb;align-self:stretch;margin-top:auto;padding:14px 9px 0;border-top:1px solid #ffffff12;color:#acbfd0;font-size:9px;letter-spacing:0;opacity:1;white-space:normal;line-height:1.4}.studio-rail-dot{width:6px;height:6px;flex-shrink:0;border-radius:50%;background:#6fd4b9}.studio-shell .global-nav .more-trigger{display:none}
.studio-shell .topbar{display:flex;align-items:center;gap:22px;min-height:90px;padding:19px 34px;background:#ffffffef;color:#213b51;border-bottom:1px solid #e2eaf1;box-shadow:0 2px 8px #182d4302}
.studio-shell .breadcrumb{display:flex;flex-direction:column;align-items:flex-start;gap:3px;flex:1;min-width:105px;font-size:15px;line-height:1.25}.studio-shell .breadcrumb>span:first-child{font-size:9px;font-weight:750;letter-spacing:.16em;color:#668094}.studio-shell .breadcrumb>strong{font-size:17px;font-weight:700;color:#1d364d;letter-spacing:-.025em;overflow-wrap:anywhere}.studio-header-utilities{display:flex;align-items:center;gap:17px;min-width:0}.studio-shell .header-actions{gap:5px;margin:0;flex-wrap:nowrap}
.studio-shell .studio-search{display:flex;align-items:center;gap:10px;border:1px solid #dce7ee;background:#f6f9fc;color:#536d83;border-radius:11px;min-width:124px;min-height:42px;padding:10px 14px;font-size:12px;font-weight:500}.studio-shell .studio-search svg{width:18px;height:18px}.studio-shell .header-actions .studio-tool{display:grid;place-items:center;width:37px;height:40px;padding:8px;color:#516d82;background:transparent;border:1px solid transparent;border-radius:10px}.studio-shell .studio-tool span{position:absolute;clip-path:inset(50%);width:1px;height:1px;overflow:hidden;white-space:nowrap}.studio-shell .header-actions .studio-tool:hover{background:#edf3f6;border-color:#dfe8ef}.studio-shell .header-actions .studio-tool[data-action=logout]:hover{color:#a02b42;background:#fff0f2}
.studio-shell .profile{display:flex;align-items:center;gap:10px;min-width:0;max-width:260px;padding-left:20px;border-left:1px solid #e3eaf1}.studio-shell .avatar{display:grid;place-items:center;width:39px;height:39px;flex-shrink:0;border:3px solid #fff;border-radius:14px;background:#e4f2ee;color:#136e60;box-shadow:0 0 0 1px #d4e8e1;font-size:12px;font-weight:750}.studio-shell .profile>div{min-width:0}.studio-shell .profile b{display:block;max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:11px;color:#233f53}.studio-shell .profile small{font-size:9px;margin-top:3px;color:#5a7386;max-width:225px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.studio-shell .page-intro{margin-bottom:26px;gap:20px}.studio-shell .page-intro h1{margin:7px 0 10px}.studio-shell .page-intro p{font-size:.88rem;color:#5d7184}.studio-shell .date-pill{background:#fff;border-color:#e0e8ef;border-radius:11px;padding:9px 13px;color:#536d83;font-variant-numeric:tabular-nums}
.studio-shell .course-tabs{display:flex;gap:6px;flex-wrap:wrap;border:1px solid #e0e8ef;background:#fff;border-radius:14px;padding:6px;margin-bottom:24px}.studio-shell .course-tabs button{border:0;background:transparent;border-radius:9px;color:#536d83;font-size:12px;min-height:40px;padding:9px 14px}.studio-shell .course-tabs button.active{background:#e5f3ed;color:#0a675d;font-weight:750}.studio-shell .course-tabs button[data-page=grades],.studio-shell .course-tabs button[data-page=rankings]{color:#0b7369}
.studio-shell .lesson-course-context{padding:20px 24px;border-radius:16px}.studio-shell .lesson-course-context h1{font-size:1.3rem}.studio-shell .course-grading-summary{border-radius:13px;border-color:#e0e8ef}.studio-shell .course-grading-summary>summary{padding:13px 17px;font-size:.8rem;color:#526c80}.studio-shell .lesson-reader{border-radius:18px;overflow:hidden;padding:26px}.studio-shell .lesson-heading{padding-bottom:20px;border-bottom-color:#e2e9ef}.studio-shell .lesson-heading h2{font-size:1.5rem;letter-spacing:-.035em;line-height:1.35}.studio-shell .lesson-position{border-radius:20px;background:#edf5f4;color:#196c61;padding:5px 10px;font-size:11px}.studio-shell .lecture{border-radius:14px;padding:24px;background:#fbfcfe;color:#334f64;line-height:1.9;font-size:.98rem}.studio-shell .lesson-tabs{border-radius:11px;gap:7px;background:#f1f5f8;padding:5px;border:0}.studio-shell .lesson-tabs [role=tab]{border-radius:8px;background:transparent;color:#546c7f;border:0;font-size:.82rem;min-height:42px}.studio-shell .lesson-tabs [role=tab][aria-selected=true]{background:#fff;color:#0b6f63;box-shadow:0 2px 7px #23405310;border:0}.studio-shell .lesson-pagination{gap:12px}.studio-shell .lesson-pagination button{border-radius:11px;background:#f2f6f9;color:#294b60;padding:13px 15px;min-width:0}.studio-shell .lesson-pagination button small{font-size:10px;line-height:1.5;color:#5c7487}.studio-shell .lesson-navigation{border-radius:15px;border-color:#dce6ef;background:#fff}.studio-shell .lesson-navigation>summary{background:#fff;color:#29495e;padding:17px}.studio-shell .lesson-navigation-body{padding:10px}.studio-shell .module-outline{border:1px solid #e4ebf0;border-radius:11px;background:#fff;overflow:hidden}.studio-shell .module-outline>summary{padding:13px;background:#f6f9fb}.studio-shell .module-outline>summary small{font-size:10px;color:#597185}.studio-shell button.lesson{padding:12px 13px;border:0;border-radius:9px;font-size:11px;line-height:1.55;background:#fff;color:#405d72;margin:4px 0}.studio-shell button.lesson.active{background:#e9f5ef;color:#0b675b;box-shadow:inset 3px 0 #23917b}.studio-shell button.lesson small{font-size:9px;color:#617789}.studio-shell .lesson-navigation-count{background:#e6f3ed;color:#0c6c60}
.studio-shell .admin-workspace .admin-sections{border-radius:14px;padding:7px;border-color:#e0e8ef}.studio-shell .admin-workspace .admin-section-button.active{background:#0f766e}.studio-shell .admin-workspace .active .admin-nav-count{color:#0f766e}.studio-shell .admin-workspace .admin-stat-card{border-radius:15px;box-shadow:0 6px 22px #16345104}.studio-shell .admin-workspace .admin-stat-card>span{color:#0f766e}.studio-shell .admin-workspace .admin-stat-card:hover{border-color:#97c5b7;background:#fbfefd}.studio-shell .admin-workspace .admin-order li:before{background:#e4f3ed;color:#126b5e}.studio-shell .admin-workspace .admin-user-card{border-radius:13px}.studio-shell .admin-workspace .admin-user-card summary:after{color:#0f766e}.studio-shell .admin-workspace .admin-shortcuts button{border-radius:10px}
.studio-shell .lesson-editor-workspace{border-radius:20px;padding:30px}.studio-shell .lesson-editor-navigation{background:#f3f6f9;border-radius:14px;border-color:#e5ebf1}.studio-shell .lesson-editor-tab.active{border-color:#d7e7e1;color:#0e705f;box-shadow:0 2px 6px #103e2c08}.studio-shell .lesson-editor-tab.active .lesson-editor-step{background:#0f766e;color:#fff}.studio-shell .lesson-editor-section-heading{border-bottom-color:#e5edf2}.studio-shell .lesson-editor-step{background:#e6edf2;color:#516d83}.studio-shell .lesson-editor-intro .eyebrow{color:#0f766e}.studio-shell .lesson-editor-save button[type=submit]{background:#0f766e}.studio-shell .lecture-toolbar{border-radius:12px;background:#f6f9fb;border-color:#dee8ef}
.studio-shell .student-next{background:linear-gradient(120deg,#123c4b,#176d66);border-radius:21px;border:1px solid #ffffff0d;box-shadow:0 10px 32px #173c4c0b}.studio-shell .student-next h2,.studio-shell .student-next h3{color:#fff}.studio-shell .student-shortcut{border-radius:15px;box-shadow:0 4px 18px #17334e04;border-color:#e0e8ef}.studio-shell .student-shortcut svg{color:#0f766e}.studio-shell .student-course-card{border-radius:18px;box-shadow:0 8px 26px #17334e05;border-color:#e1e8ef}.studio-shell .student-course-card .course-cover{border-radius:0}.studio-shell .student-course-summary{border-radius:18px;border-color:#dce9e5;background:linear-gradient(120deg,#f4faf6,#fff)}.studio-shell .student-course-summary>div:last-child strong{color:#1d4f4a}.studio-shell .student-course-summary button{background:#0f766e}.studio-shell .student-shell progress{accent-color:#1d917d}
.studio-shell .table-scroll{border:1px solid #e3eaf0;border-radius:12px;overflow:auto}.studio-shell table{font-size:.84rem}.studio-shell th{background:#f3f7fa;color:#496378;font-size:.74rem;font-weight:700;padding:14px 15px}.studio-shell td{border-bottom-color:#e8eef3;padding:14px 15px;color:#304e64}.studio-shell tr:last-child td{border-bottom:0}.studio-shell tbody tr:hover{background:#fbfefd}.studio-shell .review-item.active{background:#eaf6f0;border-color:#87baa9;color:#0f6357}.studio-shell .submission-paper{border-radius:13px;background:#fbfcfe}.studio-shell .ranking-score{color:#0f766e}.studio-shell .ranking-leader{border-radius:17px}.studio-shell .ranking-leader-position{color:#0f766e}.studio-shell .file-chip{border-radius:12px;background:#f2f7fa;border-color:#dce8ee}.studio-shell .deadline-strip{border-radius:12px;background:#f5f8fb}.studio-shell .grading-guide{border-radius:13px}.studio-shell .timer{border-radius:15px;background:#102f42;box-shadow:0 6px 26px #122f4214}
.studio-shell .mobile-more[hidden]{display:none!important}.studio-shell [hidden]{display:none!important}
@media(min-width:761px) and (max-width:1179px){.studio-shell .has-nav .workspace{margin-left:88px}.studio-shell .global-nav{width:88px;padding:22px 6px 16px}.studio-shell .rail-brand{justify-content:center;padding:0;margin-bottom:22px}.studio-shell .rail-brand>span,.studio-shell .studio-nav-caption,.studio-shell .rail-bottom{display:none}.studio-shell .studio-nav-section{gap:4px;margin-bottom:9px}.studio-shell .global-nav button{flex-direction:column;justify-content:center;gap:7px;padding:11px 4px;min-height:68px;text-align:center;border-radius:10px}.studio-shell .global-nav button>span.studio-nav-label{font-size:9px;line-height:1.3;flex:0}.studio-shell .global-nav .nav-count{position:absolute;top:3px;right:4px;min-width:17px;height:17px;font-size:8px;border-radius:5px}.studio-shell .workspace>main.wrap{padding:26px}.studio-shell .topbar{padding:18px 26px;gap:16px}.studio-shell .profile{max-width:180px;padding-left:14px}.studio-shell .profile b{max-width:140px}.studio-shell .profile small{max-width:140px}.studio-shell .studio-search{min-width:42px;width:42px;padding:10px;justify-content:center}.studio-shell .studio-search>span{position:absolute;clip-path:inset(50%);width:1px;height:1px;overflow:hidden}.studio-header-utilities{gap:9px}.studio-skip{left:100px}}
@media(max-width:760px){.studio-shell{font-size:14px}.studio-shell .has-nav .workspace{margin-left:0;padding-bottom:calc(80px + env(safe-area-inset-bottom))}.studio-shell .workspace>main.wrap{padding:24px 15px 28px}.studio-shell .topbar{padding:16px;gap:12px;min-height:80px;flex-wrap:wrap}.studio-shell .breadcrumb{min-width:90px;flex:1;gap:4px}.studio-shell .breadcrumb>strong{font-size:16px}.studio-shell .breadcrumb>span:first-child{font-size:8px}.studio-shell .profile{order:2;padding-left:0;border:0;max-width:45%;margin-left:auto;gap:8px}.studio-shell .profile b{max-width:135px;font-size:10px}.studio-shell .profile small{font-size:8px;max-width:135px}.studio-shell .avatar{width:34px;height:34px;border-radius:12px;font-size:10px}.studio-header-utilities{order:3;flex-basis:100%;border-top:1px solid #edf1f6;padding-top:10px;justify-content:space-between;gap:10px}.studio-shell .studio-search{min-height:36px;font-size:11px;flex:1;max-width:240px;min-width:0;padding:8px 11px}.studio-shell .header-actions .studio-tool{width:36px;height:36px}.studio-shell .global-nav{position:fixed;inset:auto 0 0;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:1px;width:100%;height:auto;min-height:74px;padding:8px 5px calc(8px + env(safe-area-inset-bottom));background:#102139;border-radius:20px 20px 0 0;border:0;box-shadow:0 -4px 25px #132b4326;overflow:visible;z-index:45}.studio-shell .studio-nav-section{display:contents;margin:0}.studio-shell .global-nav .desktop-only,.studio-shell .global-nav .rail-brand,.studio-shell .studio-nav-caption,.studio-shell .rail-bottom{display:none!important}.studio-shell .global-nav button,.studio-shell .global-nav .more-trigger{display:flex;align-items:center;justify-content:center;flex-direction:column;gap:6px;width:auto;min-width:0;min-height:54px;margin:0;padding:7px 2px;border-radius:12px;font-size:9px;color:#c4d3df;text-align:center}.studio-shell .global-nav button>span.studio-nav-label,.studio-shell .global-nav .more-trigger>span{font-size:8px;line-height:1.2;flex:0}.studio-shell .global-nav button>svg{width:20px;height:20px}.studio-shell .global-nav button.active{background:#24534f;color:#fff;box-shadow:none}.studio-shell .global-nav .nav-count{position:absolute;top:2px;right:10px;min-width:16px;height:16px;border-radius:5px;font-size:8px}.studio-shell .mobile-more{position:fixed;inset:auto 10px calc(86px + env(safe-area-inset-bottom));display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;padding:15px;background:#fff;border:1px solid #dfe8ef;border-radius:20px;box-shadow:0 10px 55px #16324c33;z-index:46;max-height:65vh;overflow:auto}.studio-shell .mobile-more button{display:flex;align-items:center;gap:10px;text-align:left;background:#f4f8fa;color:#2d5067;border-radius:10px;font-size:11px;min-height:48px;padding:11px}.studio-shell .mobile-more button svg{width:20px;height:20px;color:#0f766e;flex-shrink:0}.studio-shell .studio-skip{left:12px}.studio-shell .workspace>footer{padding:16px;gap:10px;font-size:9px}.studio-shell .panel{padding:18px;border-radius:15px;margin-bottom:16px}.studio-shell .page-intro{gap:13px;margin-bottom:22px}.studio-shell .page-intro h1{font-size:1.65rem}.studio-shell .date-pill{font-size:10px;padding:7px 10px}.studio-shell .course-tabs{gap:4px;padding:5px;border-radius:12px}.studio-shell .course-tabs button{font-size:10px;padding:9px 10px;min-height:38px}.studio-shell .lesson-reader{padding:18px}.studio-shell .lesson-heading h2{font-size:1.3rem}.studio-shell .lecture{padding:17px;font-size:.94rem;line-height:1.85}.studio-shell .lesson-editor-workspace{padding:20px 15px;border-radius:17px}.studio-shell .lesson-editor-navigation{gap:5px}.studio-shell .lesson-editor-tab{padding:11px 8px;font-size:10px}.studio-shell .lesson-course-context{padding:17px}.studio-shell .student-next{border-radius:18px}.studio-shell .table-scroll{border-radius:10px}.studio-shell .grid{gap:15px}.studio-shell .lesson-pagination button{padding:12px;font-size:11px}}
@media(max-width:370px){.studio-shell .topbar{padding:13px;gap:9px}.studio-shell .profile{max-width:46%}.studio-shell .profile>div{max-width:102px}.studio-shell .profile b,.studio-shell .profile small{max-width:102px}.studio-shell .breadcrumb>strong{font-size:14px}.studio-shell .workspace>main.wrap{padding:20px 12px}.studio-shell .global-nav button>span.studio-nav-label{font-size:7px}.studio-shell .studio-search{max-width:170px}.studio-shell .header-actions{gap:2px}.studio-shell .header-actions .studio-tool{width:32px}.studio-shell .page-intro h1{font-size:1.45rem}}
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