:root{--blue:#1874df;--navy:#123f73;--ink:#20324b;--muted:#78889e;--line:#e5ecf5;--bg:#f3f7fc;--green:#20a577;--shadow:0 4px 16px rgba(34,62,100,.04)}*{box-sizing:border-box}body{margin:0;font-family:'Segoe UI',Tahoma,Arial,sans-serif;color:var(--ink);background:var(--bg);font-size:14px;line-height:1.5}a{color:var(--blue);text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select,textarea{outline-offset:3px}button{cursor:pointer}.icon{width:20px;height:20px;flex-shrink:0;vertical-align:middle}.app-shell{display:flex;min-height:100vh}.app-sidebar{width:232px;background:var(--navy);color:#fff;position:fixed;inset:0 auto 0 0;overflow-y:auto;z-index:50;padding:24px 14px 16px;display:flex;flex-direction:column}.app-brand{display:flex;align-items:center;gap:11px;color:#fff;padding:0 10px 25px}.app-brand img{width:46px;height:46px;object-fit:contain}.app-brand span{font-size:10px;letter-spacing:.7px;line-height:1.8}.app-brand strong{display:block;font-size:16px;letter-spacing:1px}.nav-label{font-size:9px;letter-spacing:1.4px;color:#a6c5e6;padding:0 13px;margin:4px 0 12px}.app-sidebar nav a{display:flex;align-items:center;gap:12px;padding:10px 12px;margin:3px 0;border-radius:6px;color:#d6e5f6;font-size:12px;transition:.15s}.app-sidebar nav a:hover{background:#225285;color:#fff}.app-sidebar nav a.active{background:#1977e6;color:white;box-shadow:0 4px 12px #0c345766}.app-sidebar .icon{width:17px;height:17px}.sidebar-bottom{border-top:1px solid #ffffff1c;margin-top:auto;padding:16px 12px 0;display:flex;align-items:center;gap:12px;color:#c2d8ef;font-size:12px}.app-body{margin-left:232px;min-width:0;flex:1}.app-topbar{height:76px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:18px;padding:0 28px;position:sticky;top:0;z-index:30}.icon-button{border:0;background:transparent;color:#72859d;display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:8px}.icon-button:hover{background:#f0f6fe;color:var(--blue)}.global-search{display:flex;align-items:center;gap:10px;color:#8b9bb0;flex:1;max-width:480px}.global-search input{border:0;background:transparent;width:100%;font-size:12px}.topbar-actions{display:flex;gap:16px;align-items:center;margin-left:auto}.account{display:flex;align-items:center;gap:10px}.account strong{font-size:12px;display:block;max-width:170px}.account small{display:block;font-size:10px;color:var(--muted)}.avatar{height:34px;width:34px;display:grid;place-items:center;background:#dcecff;color:#1b6fcc;border-radius:50%;font-weight:700}.app-main{padding:24px 28px 36px;max-width:1800px;margin:auto}.breadcrumb{color:#8796a9;font-size:11px;margin-bottom:16px}.breadcrumb span{padding:0 10px}.page-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:24px}.page-heading h1{font-size:24px;letter-spacing:-.6px;margin:0 0 4px}.page-heading p{font-size:12px;color:var(--muted);margin:0}.date-chip{font-size:11px;background:white;border:1px solid var(--line);padding:7px 10px;border-radius:6px;color:#73849a;white-space:nowrap}.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:24px}.stat-card{background:#fff;border:1px solid var(--line);border-radius:9px;display:flex;gap:14px;align-items:center;padding:20px 18px;box-shadow:var(--shadow)}.stat-icon{display:grid;place-items:center;width:42px;height:42px;border-radius:9px}.stat-icon .icon{width:23px;height:23px}.blue{color:#1874df;background:#e9f2ff}.green{color:#17a777;background:#e7f8f0}.purple{color:#895add;background:#f1eaff}.orange{color:#e59128;background:#fff3e0}.stat-card small{font-size:11px;color:#7c8aa0;display:block}.stat-card strong{font-size:26px;line-height:1.2;display:block;margin-top:4px}.panel{background:#fff;border:1px solid var(--line);border-radius:9px;padding:22px;margin-bottom:22px;box-shadow:var(--shadow)}.panel h2{font-size:15px;margin:0 0 18px}.panel h3{font-size:13px;margin:0 0 10px}.muted{color:var(--muted);font-size:12px}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:18px;flex-wrap:wrap}.search-form{display:flex;align-items:center;gap:8px}.search-form input{padding:9px 12px;border:1px solid var(--line);border-radius:6px;width:230px}.search-form .icon{color:#94a3b8}.toolbar-actions{display:flex;gap:8px}.button,.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:9px 14px;border-radius:6px;border:1px solid transparent;font-size:12px;font-weight:600;white-space:nowrap;background:var(--blue);color:white;min-height:36px}.button .icon{width:16px;height:16px}.primary{background:var(--blue);color:white}.subtle,.btn.gray{color:#4d6380;background:#f4f8fc;border-color:var(--line)}.danger,.btn.red{background:#fff0f0;color:#d94a4a;border-color:#fbe0e0}.button:hover,.btn:hover{filter:brightness(.96)}.form-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.field{display:block;min-width:0;font-size:12px;color:#52667f}.field span{display:block;font-weight:600;margin-bottom:7px}.field b{color:#dd5c5c}.field input,.field select,.field textarea,.form-control{width:100%;border:1px solid #dae4f0;padding:10px 12px;border-radius:6px;color:#2d425e;background:#fff;min-height:39px}.field input:focus,.field select:focus,.field textarea:focus{border-color:#6da7ec;outline:2px solid #e5f1ff}.wide{grid-column:1/-1}.form-actions{display:flex;gap:10px;align-items:center;margin-top:20px}.table-wrap{overflow:auto;max-width:100%}.data-table,.table{width:100%;border-collapse:collapse;font-size:12px;white-space:nowrap}.data-table th,.table th{background:#f5f8fc;color:#60738f;font-size:11px;font-weight:600;text-align:left;padding:12px 14px;border-bottom:1px solid var(--line)}.data-table td,.table td{padding:12px 14px;border-bottom:1px solid #edf2f8;vertical-align:middle}.data-table tr:hover td{background:#fbfdff}.data-table input:not([type=radio]){width:62px;padding:7px;border:1px solid #dce5ef;border-radius:4px}.data-table input.notes{width:160px}.data-table select{padding:6px;border:1px solid #dce5ef;border-radius:5px}.table-action{background:#edf5ff;padding:5px 9px;border-radius:4px;font-size:11px}.pagination{display:flex;justify-content:space-between;align-items:center;padding-top:18px;color:#8b98aa;font-size:11px}.pagination a{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border:1px solid var(--line);border-radius:4px;margin-left:4px;color:#6c7e96}.pagination a.active{background:var(--blue);color:white;border-color:var(--blue)}.badge{display:inline-flex;padding:3px 8px;background:#e8f7ef;color:#209a6c;border-radius:4px;font-size:10px}.badge.gray{background:#f1f4f8;color:#6c7c90}.badge.blue{background:#e9f2ff;color:#2476ce}.alert{padding:12px 16px;border-radius:7px;margin-bottom:18px;font-size:13px}.alert.success{background:#e5f6ed;color:#19845f}.alert.error{background:#fff0f0;color:#b64040}.empty-state{padding:38px 20px;text-align:center;color:#8a98aa;font-size:13px;white-space:normal}.split-grid{display:grid;grid-template-columns:1.6fr 1fr;gap:22px}.resource-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.resource-card{border:1px solid var(--line);border-radius:8px;overflow:hidden;background:white;display:flex;flex-direction:column}.resource-cover{height:90px;background:#f3f8ff;display:grid;place-items:center;color:#4f8ed6}.resource-cover .icon{width:34px;height:34px}.resource-card-body{padding:17px;flex:1}.resource-card h3{font-size:14px;line-height:1.45;margin:8px 0;color:#2c4667}.resource-card p{font-size:12px;color:#7d8ca0}.resource-card-footer{border-top:1px solid var(--line);padding:11px 16px;display:flex;justify-content:space-between;align-items:center;font-size:11px}.notice-item{padding:15px 0;border-bottom:1px solid var(--line)}.notice-item h3{font-size:13px;margin:0 0 5px}.notice-item p{margin:5px 0;font-size:12px;color:#70839b;white-space:pre-wrap;overflow-wrap:anywhere}.quick-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.quick-card{display:flex;align-items:center;gap:12px;padding:18px;background:#f4f8fd;border:1px solid var(--line);border-radius:7px;font-size:12px;font-weight:600}.bar-chart{display:flex;flex-direction:column;gap:13px}.bar-row{display:grid;grid-template-columns:100px 1fr 45px;gap:12px;align-items:center;font-size:11px}.bar-track{height:9px;background:#edf2f8;border-radius:9px;overflow:hidden}.bar-fill{height:100%;background:#2c85eb;border-radius:9px}.app-footer{padding:10px 28px 24px;font-size:10px;color:#91a0b3}.profile-banner{background:#eaf3ff;border-radius:10px;display:flex;align-items:center;gap:20px;padding:28px;margin-bottom:22px}.profile-banner h2{font-size:22px;margin:0 0 6px}.profile-banner p{font-size:12px;margin:0;color:#617d9f}.profile-banner img{width:70px;height:70px;object-fit:contain}.login-page{min-height:100vh;display:grid;grid-template-columns:1.1fr 1fr;background:#fff}.login-story{background:linear-gradient(145deg,#0b3563,#0e5f9f);padding:10vh 8vw;color:white;display:flex;flex-direction:column;justify-content:center}.login-story img{width:86px;height:86px;object-fit:contain;margin-bottom:34px}.login-story h1{font-size:38px;line-height:1.2;letter-spacing:-1px;margin:0 0 20px}.login-story p{color:#bcd6ed;max-width:380px;font-size:15px;line-height:1.8}.login-story small{margin-top:60px;color:#a7c6e2}.login-side{display:flex;align-items:center;justify-content:center;padding:36px}.login-box{max-width:370px;width:100%}.login-box h2{font-size:28px;letter-spacing:-.7px;margin:0 0 8px}.login-box p{font-size:13px;color:#8492a4;margin:0 0 30px}.login-box .field{margin-bottom:19px}.login-box .button{width:100%;margin-top:8px;padding:13px}.login-note{font-size:11px!important;margin:24px 0!important;line-height:1.7}.login-back{font-size:12px}.calendar-week{min-width:780px;table-layout:fixed}.calendar-week td{height:115px;vertical-align:top;white-space:normal}.lesson-card{background:#edf5ff;border-left:3px solid #3d8be6;padding:8px;border-radius:4px;margin:5px 0;font-size:11px}.lesson-card strong{display:block;color:#2a5a91}.lesson-card small{font-size:10px;color:#7d94ad}.attendance-bulk{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}.checkbox-label{display:flex;align-items:center;gap:8px;font-size:12px}.details-toggle{margin:18px 0}.details-toggle summary{cursor:pointer;font-weight:600;color:#30659a;font-size:13px}.details-toggle[open] summary{margin-bottom:18px}.thumb{height:52px;width:76px;object-fit:cover;border-radius:5px}.drawer-backdrop{display:none}.print-only{display:none}@media(min-width:1600px){.resource-grid{grid-template-columns:repeat(4,1fr)}}@media(max-width:1150px){.stat-grid{grid-template-columns:repeat(2,1fr)}.form-grid{grid-template-columns:repeat(2,1fr)}.resource-grid{grid-template-columns:repeat(2,1fr)}.split-grid{grid-template-columns:1fr}.quick-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:780px){.app-sidebar{transform:translateX(-100%);transition:transform .2s}.menu-open .app-sidebar{transform:translateX(0)}.menu-open .drawer-backdrop{display:block;position:fixed;inset:0;background:#10244177;z-index:45}.app-body{margin-left:0}.app-topbar{height:64px;padding:0 14px;gap:8px}.global-search{display:none}.topbar-actions{gap:5px}.account strong{max-width:145px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.app-main{padding:20px 14px}.page-heading h1{font-size:21px}.date-chip{display:none}.stat-grid{gap:10px}.stat-card{padding:15px 11px;gap:9px}.stat-icon{width:33px;height:33px}.stat-card strong{font-size:22px}.stat-card small{font-size:10px}.panel{padding:16px}.form-grid{grid-template-columns:1fr}.resource-grid{grid-template-columns:1fr}.toolbar{align-items:stretch}.search-form{width:100%}.search-form input{min-width:0;flex:1}.quick-grid{grid-template-columns:repeat(2,1fr)}.quick-card{padding:13px;font-size:11px}.login-page{display:block}.login-story{padding:34px 28px}.login-story img{width:52px;height:52px;margin-bottom:18px}.login-story h1{font-size:26px;margin-bottom:8px}.login-story p{font-size:12px;margin:0}.login-story small{display:none}.login-side{padding:30px 24px}.login-box h2{font-size:24px}.profile-banner{padding:20px;gap:14px}.profile-banner h2{font-size:19px}.profile-banner img{width:50px;height:50px}.field input,.field select{min-height:44px}.button,.icon-button{min-height:42px}.data-table th,.data-table td{padding:10px}.app-footer{padding:10px 14px 24px}}@media print{.app-sidebar,.app-topbar,.breadcrumb,.toolbar,form,.button,.form-actions,.pagination,.app-footer,.details-toggle{display:none!important}.app-body{margin:0}.app-main{padding:0}.panel{box-shadow:none;border:0;padding:0}.table-wrap{overflow:visible}.print-only{display:block}.page-heading{margin-bottom:12px}.data-table{white-space:normal;font-size:10px}.calendar-week{min-width:0}.stat-grid{break-inside:avoid}}
/* Kiểu chữ chung cho giao diện quản trị và cổng học tập. */
body{font-family:'Segoe UI',Tahoma,Arial,sans-serif;font-size:15px}h1,h2,h3,h4{letter-spacing:normal}.data-table{font-size:14px}.app-sidebar nav a{font-size:14px}.muted,.page-heading p{color:#526477}.stat-card small{font-size:13px}.account small{font-size:12px}@media(max-width:780px){.stat-card small{font-size:12px}.quick-card{font-size:13px}.data-table{font-size:14px}}
/* Bản 1.2: không để nội dung bảng làm rộng trang trên điện thoại. */
.app-shell{width:100%;min-width:0}.app-body,.app-main{min-width:0;width:100%}.split-grid{grid-template-columns:minmax(0,1.6fr) minmax(0,1fr)}.split-grid>*{min-width:0}.panel,.stat-card,.resource-card,.quick-card{min-width:0}.table-wrap{width:100%;min-width:0;overscroll-behavior-x:contain;-webkit-overflow-scrolling:touch}.form-actions,.toolbar-actions{flex-wrap:wrap}.profile-banner>div,.stat-card>div,.resource-card-body,.resource-card-footer>*{min-width:0}.profile-banner p,.resource-card h3,.resource-card p,.notice-item,.alert{overflow-wrap:anywhere}.drawer-backdrop{display:none}.app-topbar>button[data-menu-toggle]{flex-shrink:0}.icon-button{flex-shrink:0}.stat-icon{flex-shrink:0}.profile-banner img{flex-shrink:0}.pagination{flex-wrap:wrap;gap:10px}.table-scroll-note{display:none}@media(max-width:1000px){.split-grid{grid-template-columns:minmax(0,1fr)}}
@media(max-width:780px){
 .app-body{width:100%;margin-left:0}.app-main{padding:18px 12px 26px}.app-topbar{width:100%;padding:0 12px}.topbar-actions{min-width:0;gap:4px}.account{min-width:0;gap:6px}.account strong{max-width:120px}.account small{max-width:120px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.app-sidebar{width:min(280px,86vw);padding-top:18px;padding-bottom:max(18px,env(safe-area-inset-bottom));visibility:hidden;pointer-events:none}.menu-open{overflow:hidden}.menu-open .app-sidebar{visibility:visible;pointer-events:auto}.menu-open .drawer-backdrop{display:block}.app-sidebar nav a{padding:13px 12px;min-height:44px}.page-heading{gap:8px;margin-bottom:18px}.page-heading>div{min-width:0}.page-heading h1{line-height:1.35}.page-heading p{font-size:13px;line-height:1.6}.panel{padding:16px 12px;margin-bottom:16px}.panel h2{font-size:16px}.panel h3{font-size:15px}.field{font-size:14px}.field input,.field select,.field textarea,.data-table input,.data-table select{font-size:16px}.button,.btn{font-size:14px;min-height:44px;white-space:normal}.search-form{gap:6px}.search-form input{width:0;min-width:0;flex:1;font-size:16px}.search-form .button{flex-shrink:0}.form-actions{align-items:stretch;gap:8px}.form-actions>.button{flex:1}.form-actions>form{max-width:100%}.profile-banner{padding:18px 14px;align-items:flex-start;gap:12px}.profile-banner p{font-size:13px;line-height:1.7}.stat-card{padding:14px 10px;gap:8px}.stat-card strong{font-size:23px}.stat-card small{line-height:1.5;font-size:12px}.quick-card{min-height:48px;white-space:normal;line-height:1.4}.table-scroll-note{display:block;color:#526477;font-size:12px;margin:0 0 8px}.calendar-week{min-width:760px}.data-table th{font-size:13px}.pagination{font-size:13px}.pagination a{width:36px;height:36px}.bar-row{grid-template-columns:90px minmax(0,1fr) 35px;gap:8px}.resource-card-footer{flex-wrap:wrap;gap:8px}.login-side{padding:26px 18px}.login-box{width:100%;min-width:0}.login-box .field{margin-bottom:16px}
 .mobile-records,.mobile-records tbody{display:block;width:100%;white-space:normal}.mobile-records thead{display:none}.mobile-records tbody tr{display:block;margin-bottom:12px;border:1px solid var(--line);border-radius:7px;background:#fff;overflow:hidden}.mobile-records tbody td{display:grid;grid-template-columns:minmax(90px,36%) minmax(0,1fr);gap:10px;padding:10px 12px;white-space:normal;overflow-wrap:anywhere;font-size:14px;text-align:left}.mobile-records tbody td:before{content:attr(data-label);font-size:12px;font-weight:600;color:#60738f;line-height:1.6}.mobile-records tbody td:last-child{border-bottom:0}.mobile-records td[colspan]{display:block}.mobile-records td[colspan]:before{display:none}.mobile-records td .badge{justify-self:start}.mobile-records td .table-action{justify-self:start;min-height:36px;padding:8px 12px}.mobile-records tbody tr:hover td{background:transparent}
}
@media(max-width:380px){.account strong,.account small{max-width:94px}.stat-card{align-items:flex-start}.stat-icon{width:28px;height:28px}.stat-icon .icon{width:19px;height:19px}.profile-banner img{width:38px;height:38px}.quick-card{padding:12px 8px}.mobile-records tbody td{grid-template-columns:90px minmax(0,1fr)}}
@media print{.table-scroll-note{display:none}.mobile-records{display:table}.mobile-records thead{display:table-header-group}.mobile-records tbody{display:table-row-group}.mobile-records tbody tr{display:table-row}.mobile-records tbody td{display:table-cell}.mobile-records td:before{display:none}}