:root{--ink: #14212e;--ink-2: #22323f;--ink-3: #2b3a48;--ground: #f4f5f2;--surface: #ffffff;--surface-2: #f8f9f7;--line: #dde1dc;--line-2: #eef0ec;--field: #d5dad4;--text: #14212e;--text-2: #3e4851;--muted: #56616b;--teal: #0e6b63;--teal-dark: #0a4f49;--teal-50: #e3f0ee;--amber: #b4531a;--amber-50: #fbf0dc;--amber-ink: #7a4708;--red-50: #fbe7e3;--red-ink: #8a2a18;--blue-50: #e3eaf6;--blue-ink: #233f73;--plum-50: #efe4f0;--plum-ink: #5a2f5d;--grey-50: #eef0ec;--radius: 12px;--radius-sm: 8px;--sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;--mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;--shadow: 0 8px 30px rgba(20, 33, 46, .12)}*,*:before,*:after{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:var(--sans);font-size:15px;line-height:1.5;color:var(--text);background:var(--ground);-webkit-font-smoothing:antialiased}a{color:var(--teal);text-decoration:none}a:hover{color:var(--teal-dark);text-decoration:underline}h1,h2,h3,h4{margin:0;font-weight:600;line-height:1.25}h1{font-size:24px}h2{font-size:18px}h3{font-size:16px}p{margin:0}button{font:inherit}.mono{font-family:var(--mono)}.muted{color:var(--muted)}.small{font-size:13px}.tiny{font-size:12px}.strong{font-weight:600}.nowrap{white-space:nowrap}.pre{white-space:pre-wrap}.right{text-align:right}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}:focus-visible{outline:3px solid #5aa9a2;outline-offset:2px}.app{display:flex;min-height:100vh}.sidebar{width:240px;flex-shrink:0;background:var(--ink);color:#e8ecef;display:flex;flex-direction:column;padding:22px 14px;gap:2px;position:sticky;top:0;height:100vh;overflow-y:auto}.brand{display:flex;align-items:center;gap:10px;padding:0 10px 24px;color:#fff}.brand:hover{text-decoration:none;color:#fff}.brand-mark{width:36px;height:36px;border-radius:9px;background:var(--teal);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;color:#fff;flex-shrink:0}.brand-name{font-weight:600;font-size:16px;line-height:1.2}.brand-sub{font-size:12px;color:#9faab4}.nav-link{display:flex;align-items:center;gap:12px;min-height:44px;padding:0 12px;border-radius:8px;color:#c5ced6;font-size:14px}.nav-link:hover{background:var(--ink-2);color:#fff;text-decoration:none}.nav-link.active{background:var(--ink-2);color:#fff;font-weight:600}.nav-section{font-size:11px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:#8794a0;padding:18px 12px 6px}.nav-course-dot{width:10px;height:10px;border-radius:3px;flex-shrink:0}.nav-course-code{font-family:var(--mono);font-size:13px}.sidebar-foot{margin-top:auto;border-top:1px solid var(--ink-3);padding:14px 6px 0;display:flex;align-items:center;gap:10px}.avatar{width:36px;height:36px;border-radius:50%;background:var(--ink-3);color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;flex-shrink:0}.sidebar-foot .who{min-width:0;flex:1}.sidebar-foot .who div{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.icon-btn-dark{width:40px;height:40px;border:0;border-radius:8px;background:transparent;color:#c5ced6;display:inline-flex;align-items:center;justify-content:center;cursor:pointer}.icon-btn-dark:hover{background:var(--ink-2);color:#fff}.main{flex:1;min-width:0;display:flex;flex-direction:column}.topbar{min-height:72px;background:var(--surface);border-bottom:1px solid var(--line);padding:12px 32px;display:flex;align-items:center;justify-content:space-between;gap:16px;position:sticky;top:0;z-index:5}.topbar-title{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;min-width:0}.topbar-title h1{font-size:21px}.mobile-bar{display:none}.page{padding:28px 32px 48px;width:100%;max-width:1400px}.page-narrow{max-width:760px}.two-col{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:24px;align-items:start}.three-col{display:grid;grid-template-columns:210px minmax(0,1fr) 300px;gap:24px;align-items:start}.stack{display:flex;flex-direction:column;gap:16px}.stack-lg{display:flex;flex-direction:column;gap:24px}.stack-sm{display:flex;flex-direction:column;gap:8px}.row{display:flex;align-items:center;gap:12px}.row-wrap{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.between{display:flex;align-items:center;justify-content:space-between;gap:12px}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.spacer{flex:1}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px}.card-flush{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 18px;border-bottom:1px solid var(--line-2)}.card h2,.card-flush h2{font-size:16px}.section-title{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:12px}.eyebrow{font-size:12px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}.list-row{display:flex;align-items:center;gap:14px;padding:13px 18px;border-top:1px solid var(--line-2);color:var(--text)}.list-row:first-child{border-top:0}a.list-row:hover,button.list-row:hover{background:var(--surface-2);text-decoration:none;color:var(--text)}button.list-row{width:100%;border-left:0;border-right:0;border-bottom:0;background:none;text-align:left;cursor:pointer}.list-main{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}.list-main .title{font-weight:500;overflow-wrap:anywhere}.hero{background:var(--ink);color:#fff;border-radius:14px;padding:22px 26px;display:flex;align-items:center;gap:22px}.hero .date-block{width:76px;height:84px;border-radius:10px;background:var(--ink-2);display:flex;flex-direction:column;align-items:center;justify-content:center;flex-shrink:0}.hero .date-block .d{font-size:30px;font-weight:600;line-height:1}.hero .kicker{font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:#f2c98b}.hero .title{font-size:20px;font-weight:600}.hero .meta{color:#c5ced6;font-size:14px}.course-band{color:#fff;padding:20px 32px 0}.course-band a{color:#ffffffd9}.course-band h1{font-size:27px;color:#fff}.course-band .code{font-family:var(--mono);font-size:13px;opacity:.85}.band-chip{font-size:12px;padding:5px 10px;border-radius:999px;background:#00000038;color:#fff}.band-tabs{display:flex;gap:26px;margin-top:16px;overflow-x:auto;scrollbar-width:none}.band-tabs button{height:46px;padding:0;border:0;background:transparent;color:#fffc;border-bottom:3px solid transparent;cursor:pointer;white-space:nowrap;font-size:14px}.band-tabs button[aria-selected=true]{color:#fff;font-weight:600;border-bottom-color:#fff}.course-tile{display:flex;gap:14px;align-items:flex-start;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;color:var(--text)}.course-tile:hover{border-color:#b9c1b8;text-decoration:none;color:var(--text);box-shadow:0 2px 10px #14212e0f}.swatch{width:42px;height:42px;border-radius:10px;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:#fff}.kpi{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;display:flex;flex-direction:column;gap:4px}.kpi .v{font-family:var(--mono);font-size:24px;font-weight:500}.kpi .l{font-size:13px;color:var(--muted)}.day-chip{width:46px;height:50px;border-radius:8px;flex-shrink:0;display:flex;flex-direction:column;align-items:center;justify-content:center}.day-chip .dd{font-size:16px;font-weight:600;line-height:1}.day-chip .dw{font-size:11px;font-weight:600}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 18px;border-radius:8px;border:1px solid var(--field);background:var(--surface);color:var(--text);font-size:14px;font-weight:500;cursor:pointer;white-space:nowrap;text-decoration:none}.btn:hover{background:var(--surface-2);text-decoration:none;color:var(--text)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background:var(--teal);border-color:var(--teal);color:#fff;font-weight:600}.btn-primary:hover{background:var(--teal-dark);color:#fff}.btn-dark{background:var(--ink);border-color:var(--ink);color:#fff;font-weight:600}.btn-dark:hover{background:var(--ink-2);color:#fff}.btn-light{background:#fff;border-color:#fff;color:var(--ink);font-weight:600}.btn-ghost{background:transparent;border-color:transparent;color:var(--teal-dark)}.btn-ghost:hover{background:var(--teal-50);color:var(--teal-dark)}.btn-danger{background:var(--surface);border-color:#e3b7ad;color:var(--red-ink)}.btn-danger:hover{background:var(--red-50);color:var(--red-ink)}.btn-sm{min-height:36px;padding:0 12px;font-size:13px}.btn-block{width:100%}.icon-btn{width:40px;height:40px;border-radius:8px;border:1px solid var(--field);background:var(--surface);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text);flex-shrink:0}.icon-btn:hover{background:var(--surface-2)}.icon-btn.plain{border-color:transparent;background:transparent}.field{display:flex;flex-direction:column;gap:6px}.field>span,.field-label{font-size:13px;font-weight:500;color:var(--text-2)}.field .hint{font-size:12px;color:var(--muted);font-weight:400}.input,.select,.textarea{width:100%;min-height:44px;border:1px solid var(--field);border-radius:8px;padding:0 12px;font:inherit;font-size:15px;background:var(--surface);color:var(--text)}.textarea{padding:10px 12px;min-height:96px;resize:vertical;line-height:1.5}.input:focus,.select:focus,.textarea:focus{border-color:var(--teal);outline:2px solid rgba(14,107,99,.2);outline-offset:0}.input.mono{font-family:var(--mono)}.check{display:flex;align-items:flex-start;gap:10px;font-size:14px;cursor:pointer;min-height:32px}.check input{width:18px;height:18px;margin-top:2px;accent-color:var(--teal);flex-shrink:0}.search{position:relative;display:flex;align-items:center}.search svg{position:absolute;left:12px;color:var(--muted);pointer-events:none}.search .input{padding-left:38px}.chips{display:flex;gap:6px;flex-wrap:wrap}.chip{min-height:36px;padding:0 14px;border-radius:999px;border:1px solid var(--field);background:var(--surface);font-size:13px;cursor:pointer;color:var(--text)}.chip[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:#fff;font-weight:600}.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:20px;overflow-x:auto}.tabs button{height:44px;padding:0 14px;border:0;background:transparent;cursor:pointer;color:var(--muted);border-bottom:3px solid transparent;white-space:nowrap}.tabs button[aria-selected=true]{color:var(--text);font-weight:600;border-bottom-color:var(--teal)}.badge{display:inline-flex;align-items:center;gap:4px;font-size:12px;font-weight:600;padding:3px 10px;border-radius:999px;white-space:nowrap;background:var(--grey-50);color:var(--text-2)}.badge-teal{background:var(--teal-50);color:var(--teal-dark)}.badge-amber{background:var(--amber-50);color:var(--amber-ink)}.badge-red{background:var(--red-50);color:var(--red-ink)}.badge-blue{background:var(--blue-50);color:var(--blue-ink)}.badge-plum{background:var(--plum-50);color:var(--plum-ink)}.kind{width:66px;flex-shrink:0;text-align:center;font-size:11px;font-weight:600;padding:5px 0;border-radius:6px;text-transform:uppercase;letter-spacing:.03em}.table-wrap{overflow-x:auto}table.table{width:100%;border-collapse:collapse;font-size:14px}.table th{text-align:left;font-size:12px;font-weight:600;letter-spacing:.03em;text-transform:uppercase;color:var(--muted);background:var(--surface-2);padding:10px 14px;white-space:nowrap}.table td{padding:11px 14px;border-top:1px solid var(--line-2);vertical-align:middle}.table td.num,.table th.num{text-align:right;font-family:var(--mono)}.table tr:hover td{background:#fbfbfa}.bar-track{height:6px;border-radius:3px;background:#e7eae6;overflow:hidden}.bar-fill{height:6px;border-radius:3px}.dist{display:flex;align-items:flex-end;gap:10px;height:120px;border-bottom:1px solid var(--field)}.dist-col{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:4px;height:100%}.dist-bar{width:100%;max-width:70px;border-radius:6px 6px 0 0}.dist-labels{display:flex;gap:10px;margin-top:6px}.dist-labels span{flex:1;text-align:center;font-size:12px;color:var(--muted)}.notice{border-radius:10px;padding:12px 14px;font-size:14px;line-height:1.5;border:1px solid}.notice-info{background:var(--teal-50);border-color:#bcdcd7;color:var(--teal-dark)}.notice-warn{background:var(--amber-50);border-color:#efd29f;color:var(--amber-ink)}.notice-error{background:var(--red-50);border-color:#efc2b8;color:var(--red-ink)}.empty{text-align:center;padding:36px 20px;color:var(--muted);display:flex;flex-direction:column;align-items:center;gap:8px}.empty .icon-circle{width:48px;height:48px;border-radius:50%;background:var(--grey-50);display:flex;align-items:center;justify-content:center;color:var(--text-2);margin-bottom:4px}.empty strong{color:var(--text)}.spinner{width:22px;height:22px;border:3px solid var(--line);border-top-color:var(--teal);border-radius:50%;animation:spin .8s linear infinite}.loading{display:flex;align-items:center;justify-content:center;gap:12px;padding:48px;color:var(--muted)}@keyframes spin{to{transform:rotate(360deg)}}.toasts{position:fixed;bottom:20px;right:20px;display:flex;flex-direction:column;gap:10px;z-index:100;max-width:min(420px,calc(100vw - 40px))}.toast{background:var(--ink);color:#fff;padding:12px 16px;border-radius:10px;box-shadow:var(--shadow);font-size:14px;display:flex;gap:10px;align-items:flex-start}.toast.error{background:var(--red-ink)}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#14212e73;display:flex;align-items:center;justify-content:center;padding:16px;z-index:50}.modal{background:var(--surface);border-radius:14px;width:100%;max-width:560px;max-height:calc(100vh - 32px);display:flex;flex-direction:column;box-shadow:var(--shadow)}.modal.wide{max-width:820px}.modal-head{padding:18px 22px;border-bottom:1px solid var(--line-2);display:flex;align-items:center;justify-content:space-between;gap:12px}.modal-body{padding:20px 22px;overflow-y:auto;display:flex;flex-direction:column;gap:16px}.modal-foot{padding:14px 22px;border-top:1px solid var(--line-2);display:flex;justify-content:flex-end;gap:10px;flex-wrap:wrap}.auth{min-height:100vh;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.auth-side{background:var(--ink);color:#fff;padding:48px;display:flex;flex-direction:column;justify-content:space-between}.auth-side h2{font-size:34px;line-height:1.2;max-width:440px}.auth-side p{color:#c5ced6;max-width:420px;margin-top:14px;font-size:16px}.auth-points{display:flex;flex-direction:column;gap:14px;color:#c5ced6;font-size:15px}.auth-points div{display:flex;gap:12px;align-items:center}.auth-main{display:flex;align-items:center;justify-content:center;padding:32px 20px}.auth-card{width:100%;max-width:400px;display:flex;flex-direction:column;gap:18px}.auth-mobile-head .small{display:none}@media (max-width: 960px){.auth-mobile-head .small{display:block}}.quiz-shell{min-height:100vh;display:flex;flex-direction:column}.quiz-top{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.quiz-top-inner{min-height:66px;padding:10px 28px;display:flex;align-items:center;justify-content:space-between;gap:12px}.timer{display:inline-flex;align-items:center;gap:8px;min-height:40px;padding:0 14px;border-radius:8px;background:var(--amber-50);color:var(--amber-ink);font-family:var(--mono);font-size:15px}.timer.low{background:var(--red-50);color:var(--red-ink)}.progress{height:4px;background:var(--line-2)}.progress>div{height:4px;background:var(--teal);transition:width .3s}.quiz-body{flex:1;display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;padding:24px 28px 40px;max-width:1280px;width:100%;margin:0 auto;align-items:start}.question-card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:32px 38px;display:flex;flex-direction:column;gap:20px;min-height:480px}.question-text{font-size:18px;line-height:1.65;white-space:pre-wrap;max-width:720px}.answer-box{background:var(--surface-2);border:1px solid var(--line-2);border-radius:10px;padding:18px 20px;display:flex;flex-direction:column;gap:12px;max-width:700px}.option{display:flex;align-items:center;gap:14px;min-height:52px;padding:10px 16px;border:1px solid var(--field);border-radius:10px;background:var(--surface);cursor:pointer;font-size:16px;text-align:left;width:100%;color:var(--text)}.option:hover{border-color:#aab3a9}.option.selected{border:2px solid var(--teal);background:var(--teal-50);padding:9px 15px}.option .letter{width:28px;height:28px;border-radius:50%;border:1px solid var(--field);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;flex-shrink:0;background:#fff}.option.selected .letter{background:var(--teal);border-color:var(--teal);color:#fff}.option.correct{border:2px solid var(--teal);background:var(--teal-50)}.option.wrong{border:2px solid #d9907d;background:var(--red-50)}.qnav{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px}.qnav button{height:42px;border-radius:8px;border:0;background:var(--grey-50);color:var(--text-2);font-weight:600;cursor:pointer}.qnav button.done{background:var(--teal);color:#fff}.qnav button.flag{background:#f2c98b;color:#5c3406}.qnav button.current{outline:2px solid var(--ink);outline-offset:1px}.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:12px;color:var(--muted)}.legend span{display:inline-flex;gap:6px;align-items:center}.legend i{width:12px;height:12px;border-radius:3px;display:inline-block}.save-state{font-size:13px}.q-edit{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.q-edit-head{display:flex;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid var(--line-2)}.q-edit-body{padding:18px;display:flex;flex-direction:column;gap:14px}.opt-row{display:flex;align-items:center;gap:10px}.var-grid{display:grid;grid-template-columns:90px repeat(3,minmax(0,1fr)) 40px;gap:8px;align-items:center}@media (max-width: 1180px){.three-col{grid-template-columns:190px minmax(0,1fr)}.three-col>aside{grid-column:1 / -1}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width: 960px){.sidebar{position:fixed;left:0;top:0;bottom:0;z-index:60;transform:translate(-100%);transition:transform .2s ease;height:100%}.sidebar.open{transform:translate(0);box-shadow:var(--shadow)}.scrim{position:fixed;top:0;right:0;bottom:0;left:0;background:#14212e73;z-index:55}.mobile-bar{display:flex;align-items:center;gap:12px;background:var(--ink);color:#fff;padding:10px 14px;position:sticky;top:0;z-index:20}.topbar{position:static;padding:14px 18px;flex-wrap:wrap}.page{padding:20px 16px 40px}.two-col,.three-col{grid-template-columns:minmax(0,1fr)}.course-band{padding:16px 16px 0}.course-band h1{font-size:22px}.quiz-body{grid-template-columns:minmax(0,1fr);padding:16px}.question-card{padding:22px 18px;min-height:0}.quiz-top-inner{padding:10px 16px}.auth{grid-template-columns:minmax(0,1fr)}.auth-side{display:none}}@media (max-width: 640px){.grid-2,.grid-3,.grid-4{grid-template-columns:minmax(0,1fr)}.hero{flex-direction:column;align-items:flex-start;padding:20px}.hero .date-block{display:none}.question-text{font-size:17px}.var-grid{grid-template-columns:70px repeat(3,minmax(0,1fr)) 36px}.hide-sm{display:none}.modal-backdrop{align-items:flex-end;padding:0}.modal{border-radius:14px 14px 0 0;max-height:92vh}}.quiz-shell.strict{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}.quiz-shell.strict input,.quiz-shell.strict textarea{-webkit-user-select:text;user-select:text}.fs-gate{position:fixed;top:0;right:0;bottom:0;left:0;z-index:45;background:#14212eeb;display:flex;align-items:center;justify-content:center;padding:16px}.qnav button:disabled{opacity:.45;cursor:not-allowed}@media print{.quiz-shell{display:none!important}}