:root{--brand:#2563eb;--brand-dark:#1d4ed8;--brand-light:#eff6ff;--ink:#0f172a;--ink-2:#334155;--muted:#64748b;--line:#e2e8f0;--bg:#f1f5f9;--panel:#fff;--ok:#16a34a;--ok-bg:#dcfce7;--warn:#d97706;--warn-bg:#fef3c7;--danger:#dc2626;--danger-bg:#fee2e2;--info:#0891b2;--info-bg:#cffafe;--radius:10px;--shadow:0 1px 3px rgba(15,23,42,.08),0 1px 2px rgba(15,23,42,.04);--shadow-lg:0 10px 30px rgba(15,23,42,.12);--sidebar-w:250px}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:14px;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{margin:0;font-weight:600;line-height:1.3}.layout{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-w);flex:0 0 var(--sidebar-w);background:#0f172a;color:#cbd5e1;display:flex;flex-direction:column;position:fixed;top:0;bottom:0;left:0;overflow-y:auto;z-index:40;transition:transform .2s ease}.sidebar__brand{padding:20px 18px;font-size:16px;font-weight:700;color:#fff;border-bottom:1px solid hsla(0,0%,100%,.08);display:flex;align-items:center;gap:10px}.sidebar__logo{width:32px;height:32px;border-radius:8px;background:var(--brand);display:grid;place-items:center;font-size:15px}.sidebar__group{padding:14px 0 4px}.sidebar__group-title{padding:0 18px 6px;font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:#64748b}.sidebar__link{display:flex;align-items:center;gap:10px;padding:9px 18px;color:#cbd5e1;font-size:13.5px;border-left:3px solid transparent}.sidebar__link:hover{background:hsla(0,0%,100%,.05);color:#fff;text-decoration:none}.sidebar__link.router-link-active{background:rgba(37,99,235,.18);border-left-color:var(--brand);color:#fff;font-weight:500}.sidebar__icon{width:18px;text-align:center;opacity:.9}.main{flex:1;margin-left:var(--sidebar-w);display:flex;flex-direction:column;min-width:0}.topbar{height:60px;background:var(--panel);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 22px;position:sticky;top:0;z-index:30}.topbar__title{font-size:16px;font-weight:600}.topbar__user{display:flex;align-items:center;gap:12px}.avatar{width:34px;height:34px;border-radius:50%;background:var(--brand-light);color:var(--brand);display:grid;place-items:center;font-weight:600;font-size:13px}.content{padding:22px;flex:1}.burger{display:none;background:none;border:none;font-size:20px;cursor:pointer;color:var(--ink-2)}.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.panel__head{padding:14px 18px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.panel__title{font-size:15px;font-weight:600}.panel__body{padding:18px}.panel+.panel{margin-top:18px}.page-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-bottom:18px}.page-head h1{font-size:20px}.page-head p{margin:4px 0 0;color:var(--muted);font-size:13px}.grid{display:grid;gap:16px}.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow)}.stat__label{color:var(--muted);font-size:12.5px}.stat__value{font-size:26px;font-weight:700;margin-top:6px;line-height:1}.stat__hint{color:var(--muted);font-size:12px;margin-top:6px}.field{margin-bottom:14px}.field__label{display:block;font-size:12.5px;font-weight:500;color:var(--ink-2);margin-bottom:5px}.field__label .req{color:var(--danger)}.input,.select,.textarea{width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:8px;font:inherit;color:var(--ink);background:#fff;outline:none;transition:border-color .15s,box-shadow .15s}.input:focus,.select:focus,.textarea:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(37,99,235,.12)}.input:disabled,.select:disabled{background:#f8fafc;color:var(--muted)}.textarea{min-height:90px;resize:vertical}.field__error{color:var(--danger);font-size:12px;margin-top:4px}.field--invalid .input,.field--invalid .select,.field--invalid .textarea{border-color:var(--danger)}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 14px}.form-grid .full{grid-column:1/-1}.checkbox{display:inline-flex;align-items:center;gap:8px;cursor:pointer;font-size:13.5px}.checkbox input{width:16px;height:16px;accent-color:var(--brand)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:8px 15px;border:1px solid transparent;border-radius:8px;background:var(--brand);color:#fff;font:inherit;font-weight:500;cursor:pointer;transition:background .15s,opacity .15s;white-space:nowrap}.btn:hover{background:var(--brand-dark);text-decoration:none;color:#fff}.btn:disabled{opacity:.55;cursor:not-allowed}.btn--ghost{background:#fff;color:var(--ink-2);border-color:var(--line)}.btn--ghost:hover{background:#f8fafc;color:var(--ink)}.btn--danger{background:var(--danger)}.btn--danger:hover{background:#b91c1c}.btn--success{background:var(--ok)}.btn--success:hover{background:#15803d}.btn--sm{padding:5px 10px;font-size:12.5px;border-radius:7px}.btn--block{width:100%}.btn-row{display:flex;gap:8px;flex-wrap:wrap}.table-wrap{overflow-x:auto}.table{width:100%;border-collapse:collapse;font-size:13.5px}.table th{text-align:left;background:#f8fafc;color:var(--ink-2);font-weight:600;font-size:12.5px;white-space:nowrap}.table td,.table th{padding:10px 12px;border-bottom:1px solid var(--line)}.table td{vertical-align:middle}.table tbody tr:hover{background:#f8fafc}.table td.actions{white-space:nowrap;text-align:right}.table .num{text-align:right;font-variant-numeric:tabular-nums}.table__empty{text-align:center;padding:34px 12px;color:var(--muted)}.badge{display:inline-block;padding:3px 9px;border-radius:999px;font-size:11.5px;font-weight:600;background:#f1f5f9;color:var(--ink-2);white-space:nowrap}.badge--ok{background:var(--ok-bg);color:#166534}.badge--warn{background:var(--warn-bg);color:#92400e}.badge--danger{background:var(--danger-bg);color:#991b1b}.badge--info{background:var(--info-bg);color:#155e75}.badge--muted{background:#f1f5f9;color:var(--muted)}.filters{display:flex;gap:10px;flex-wrap:wrap;align-items:flex-end}.filters .field{margin-bottom:0;min-width:150px}.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);overflow-x:auto}.tab{padding:10px 16px;border:none;background:none;font:inherit;color:var(--muted);cursor:pointer;border-bottom:2px solid transparent;white-space:nowrap}.tab:hover{color:var(--ink)}.tab.is-active{color:var(--brand);border-bottom-color:var(--brand);font-weight:600}.modal-backdrop{position:fixed;inset:0;background:rgba(15,23,42,.5);display:flex;align-items:flex-start;justify-content:center;padding:40px 16px;overflow-y:auto;z-index:60}.modal{background:#fff;border-radius:12px;box-shadow:var(--shadow-lg);width:100%;max-width:560px;animation:modal-in .15s ease}.modal--lg{max-width:860px}.modal--sm{max-width:420px}@keyframes modal-in{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}.modal__head{padding:16px 20px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.modal__title{font-size:15.5px;font-weight:600}.modal__close{border:none;background:none;font-size:22px;line-height:1;cursor:pointer;color:var(--muted);padding:0 4px}.modal__body{padding:20px}.modal__foot{padding:14px 20px;border-top:1px solid var(--line);display:flex;justify-content:flex-end;gap:8px}.toasts{position:fixed;right:18px;bottom:18px;display:flex;flex-direction:column;gap:10px;z-index:90}.toast{min-width:260px;max-width:380px;padding:12px 16px;border-radius:10px;background:#fff;box-shadow:var(--shadow-lg);border-left:4px solid var(--ok);font-size:13.5px;animation:modal-in .15s ease}.toast--error{border-left-color:var(--danger)}.toast--info{border-left-color:var(--info)}.muted{color:var(--muted)}.small{font-size:12.5px}.strong{font-weight:600}.text-right{text-align:right}.text-center{text-align:center}.mt-0{margin-top:0}.mt-1{margin-top:8px}.mt-2{margin-top:16px}.mt-3{margin-top:24px}.mb-1{margin-bottom:8px}.mb-2{margin-bottom:16px}.flex{display:flex}.flex-between{display:flex;align-items:center;justify-content:space-between;gap:12px}.gap-1{gap:8px}.gap-2{gap:16px}.wrap{flex-wrap:wrap}.nowrap{white-space:nowrap}.loading{padding:40px;text-align:center;color:var(--muted)}.spinner{width:26px;height:26px;border:3px solid var(--line);border-top-color:var(--brand);border-radius:50%;animation:spin .7s linear infinite;margin:0 auto 10px}@keyframes spin{to{transform:rotate(1turn)}}.empty{padding:40px 20px;text-align:center;color:var(--muted)}.alert{padding:12px 14px;border-radius:8px;font-size:13.5px;margin-bottom:14px}.alert--error{background:var(--danger-bg);color:#991b1b}.alert--info{background:var(--brand-light);color:#1e40af}.alert--warn{background:var(--warn-bg);color:#92400e}.pagination{display:flex;align-items:center;gap:6px;justify-content:flex-end;padding:12px 18px;border-top:1px solid var(--line);flex-wrap:wrap}.pagination__btn{min-width:32px;height:32px;padding:0 8px;border:1px solid var(--line);background:#fff;border-radius:7px;cursor:pointer;font:inherit;font-size:13px}.pagination__btn:hover:not(:disabled){background:#f8fafc}.pagination__btn.is-active{background:var(--brand);color:#fff;border-color:var(--brand)}.pagination__btn:disabled{opacity:.45;cursor:not-allowed}.auth{min-height:100vh;display:grid;place-items:center;background:linear-gradient(135deg,#1e3a8a,#0f172a);padding:20px}.auth__card{width:100%;max-width:390px;background:#fff;border-radius:14px;padding:32px;box-shadow:var(--shadow-lg)}.auth__logo{width:52px;height:52px;border-radius:14px;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:22px;margin:0 auto 16px}.auth__title{text-align:center;font-size:19px;margin-bottom:4px}.auth__sub{text-align:center;color:var(--muted);font-size:13px;margin-bottom:22px}.auth__hint{margin-top:18px;padding-top:16px;border-top:1px solid var(--line);font-size:12px;color:var(--muted);line-height:1.7}.test-timer{font-size:20px;font-weight:700;font-variant-numeric:tabular-nums;padding:6px 14px;border-radius:8px;background:var(--brand-light);color:var(--brand-dark)}.test-timer.is-danger{background:var(--danger-bg);color:#991b1b}.q-nav{display:flex;flex-wrap:wrap;gap:6px}.q-nav__item{width:34px;height:34px;border:1px solid var(--line);border-radius:7px;background:#fff;cursor:pointer;font:inherit;font-size:12.5px}.q-nav__item.is-answered{background:var(--ok-bg);border-color:#86efac;color:#166534}.q-nav__item.is-current{outline:2px solid var(--brand);outline-offset:1px}.option{display:flex;align-items:flex-start;gap:10px;padding:11px 14px;border:1px solid var(--line);border-radius:9px;cursor:pointer;margin-bottom:8px;transition:border-color .12s,background .12s}.option:hover{border-color:var(--brand);background:var(--brand-light)}.option input{margin-top:2px;accent-color:var(--brand)}.option.is-selected{border-color:var(--brand);background:var(--brand-light)}.option.is-correct{border-color:#86efac;background:var(--ok-bg)}.option.is-wrong{border-color:#fca5a5;background:var(--danger-bg)}.q-card{padding:18px;border:1px solid var(--line);border-radius:10px;margin-bottom:14px;background:#fff}.q-card__head{display:flex;justify-content:space-between;gap:12px;margin-bottom:12px}.q-card__text{font-weight:500;font-size:14.5px;line-height:1.55}.chat{display:flex;flex-direction:column;gap:12px}.msg{padding:12px 14px;border-radius:10px;background:#f8fafc;border:1px solid var(--line);max-width:80%}.msg--own{align-self:flex-end;background:var(--brand-light);border-color:#bfdbfe}.msg__meta{font-size:11.5px;color:var(--muted);margin-bottom:5px}.file-card{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--line);border-radius:10px;margin-bottom:10px;background:#fff}.file-card__icon{width:40px;height:40px;border-radius:9px;display:grid;place-items:center;font-size:17px;background:var(--brand-light);flex:0 0 40px}.file-card__body{flex:1;min-width:0}.file-card__title{font-weight:500}video{max-width:100%;border-radius:10px;background:#000}.card-badge{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;border-radius:999px;font-size:11.5px;font-weight:600;border:1px solid transparent;white-space:nowrap}.card-badge--green{background:var(--ok-bg);color:#166534;border-color:#86efac}.card-badge--yellow{background:var(--warn-bg);color:#92400e;border-color:#fcd34d}.card-badge--red{background:var(--danger-bg);color:#991b1b;border-color:#fca5a5}.card-pick{display:flex;gap:5px}.card-pick__btn{width:34px;height:30px;border:1px solid var(--line);border-radius:7px;background:#fff;cursor:pointer;font-size:14px;line-height:1;opacity:.45;transition:opacity .12s,border-color .12s,transform .12s}.card-pick__btn:hover{opacity:.85}.card-pick__btn.is-active{opacity:1;transform:scale(1.08)}.card-pick__btn.is-active[data-card=green]{border-color:#16a34a;background:var(--ok-bg)}.card-pick__btn.is-active[data-card=yellow]{border-color:#d97706;background:var(--warn-bg)}.card-pick__btn.is-active[data-card=red]{border-color:#dc2626;background:var(--danger-bg)}.card-pick__btn:disabled{opacity:.2;cursor:not-allowed}.card-bar{display:flex;height:10px;border-radius:999px;overflow:hidden;background:var(--line);min-width:120px}.card-bar span{display:block;height:100%}.card-bar .g{background:var(--ok)}.card-bar .y{background:var(--warn)}.card-bar .r{background:var(--danger)}.day-card{border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff;margin-bottom:12px}.day-card.is-today{border-color:var(--brand);box-shadow:0 0 0 3px rgba(37,99,235,.1)}.day-card__head{padding:10px 14px;background:#f8fafc;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:10px}.day-card__date{font-weight:600}.day-card.is-today .day-card__date{color:var(--brand)}.lesson-row{display:flex;align-items:flex-start;gap:14px;padding:12px 14px;border-bottom:1px solid var(--line)}.lesson-row:last-child{border-bottom:none}.lesson-row.is-past{opacity:.6}.lesson-row__time{flex:0 0 92px;font-weight:600;font-variant-numeric:tabular-nums;color:var(--brand-dark)}.lesson-row__body{flex:1;min-width:0}.lesson-row__topic{font-weight:500}.lesson-row__meta{font-size:12.5px;color:var(--muted);margin-top:3px}.weekday-pick{display:flex;flex-wrap:wrap;gap:6px}.weekday-pick__btn{padding:7px 12px;border:1px solid var(--line);border-radius:7px;background:#fff;cursor:pointer;font:inherit;font-size:13px}.weekday-pick__btn.is-active{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:500}@media (max-width:1100px){.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width:900px){.sidebar{transform:translateX(-100%)}.sidebar.is-open{transform:none}.main{margin-left:0}.burger{display:block}.form-grid,.grid--2,.grid--3{grid-template-columns:1fr}.content{padding:16px}}@media (max-width:560px){.grid--4{grid-template-columns:1fr}}