:root{--sion-surface:#f6f8fb;--sion-ink:#182433;--sion-card:#fff;--sion-border:#62697629;--sion-muted:#667085;--sion-primary:#206bc4;--sion-primary-soft:#edf4ff;--sion-control:#fff;--sion-control-strong:#f8fafc}*{box-sizing:border-box}body{background:var(--sion-surface);min-height:100vh;color:var(--sion-ink);text-rendering:geometricprecision;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-synthesis:none;margin:0}[data-bs-theme=dark]{--sion-surface:#0e141f;--sion-ink:#eef3f8;--sion-card:#151e2c;--sion-border:#94a3b82e;--sion-muted:#93a3b8;--sion-primary:#5b9dff;--sion-primary-soft:#5b9dff24;--sion-control:#101827;--sion-control-strong:#1b2738}button{font:inherit}.auth-screen{background:radial-gradient(circle at 20% 10%,#206bc421,#0000 34%),linear-gradient(145deg,#eef3fb 0%,#fff 54%,#eef6f2 100%);place-items:center;min-height:100vh;padding:24px;display:grid}.auth-panel{width:min(100%,430px)}.verify-screen{background:radial-gradient(circle at 18% 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#62697629;border-radius:8px;box-shadow:0 18px 55px #18243317}.demo-strip{flex-wrap:wrap;justify-content:center;gap:8px;margin-top:16px;display:flex}[data-bs-theme=dark] .auth-screen{background:radial-gradient(circle at 18% 12%,#5b9dff38,#0000 31%),radial-gradient(circle at 82% 78%,#2dd4bf21,#0000 34%),linear-gradient(145deg,#0b1220 0%,#111827 54%,#0d1625 100%)}[data-bs-theme=dark] .brand-mark{color:#fff;background:linear-gradient(145deg,#2d7ddd,#5b9dff);border:1px solid #dbeafe38;box-shadow:0 18px 38px #206bc457,0 0 0 7px #5b9dff1a}[data-bs-theme=dark] .auth-brand-mark.has-logo{background:#ffffffeb;border-color:#dbeafe5c;box-shadow:0 18px 38px #00000047,0 0 0 7px #5b9dff1a}[data-bs-theme=dark] .auth-heading .text-secondary{color:#aebbd0!important}[data-bs-theme=dark] .auth-heading h1{color:#f4f8ff;text-shadow:0 1px 18px #5b9dff29}[data-bs-theme=dark] .auth-card{background:#151e2cf5;border-color:#94a3b83d;box-shadow:0 22px 60px #00000057,0 0 0 1px #5b9dff0d}[data-bs-theme=dark] .auth-card .form-label,[data-bs-theme=dark] .auth-card .form-check-label{color:#e8eef8}[data-bs-theme=dark] .auth-card .form-control{color:#f4f8ff;background:#0f1726;border-color:#94a3b847}[data-bs-theme=dark] .auth-card .form-control:focus{border-color:#5b9dff;box-shadow:0 0 0 3px #5b9dff38}[data-bs-theme=dark] .auth-card .input-icon-addon{color:#aebbd0}[data-bs-theme=dark] .demo-strip .btn-outline-primary{color:#d8e8ff;background:#5b9dff14;border-color:#5b9dff7a}[data-bs-theme=dark] .demo-strip .btn-outline-primary:hover{color:#fff;background:#5b9dff2e;border-color:#5b9dff}.app-shell{grid-template-columns:264px 1fr;min-height:100vh;display:grid}.sidebar{border-right:1px solid var(--sion-border);background:var(--sion-card);flex-direction:column;height:100vh;padding:20px 14px 20px 20px;display:flex;position:sticky;top:0;overflow:hidden}.sidebar-brand{flex:none;align-items:center;gap:12px;margin:0 6px 20px 0;display:flex}.sidebar-brand strong,.sidebar-brand 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var(--sion-border);color:var(--sion-muted);background:var(--sion-control);text-align:center;border-radius:8px;padding:18px 10px;font-size:13px;font-weight:700}.mobile-more-icon{width:42px;height:42px;color:var(--sion-primary);background:var(--sion-primary-soft);border-radius:8px;place-items:center;display:grid}.mobile-more-item strong,.mobile-more-item small{display:block}.mobile-more-item small{color:var(--sion-muted);margin-top:3px;line-height:1.3}}@keyframes mobile-sheet-enter{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@media (prefers-reduced-motion:reduce){.mobile-more-sheet{animation:none}}@media (max-width:430px){.auth-screen{padding:calc(18px + env(safe-area-inset-top)) 14px 18px;align-items:stretch}.auth-panel{flex-direction:column;justify-content:center;min-height:100%;display:flex}.auth-brand-mark{border-radius:21px;width:82px;height:82px}.auth-heading h1{font-size:23px}.timeline-row{grid-template-columns:48px 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var(--sion-border);justify-content:flex-end;align-items:center;gap:8px;padding:10px 14px;display:flex}.filter-select{min-width:150px;color:var(--sion-muted);align-items:center;gap:8px;padding:0 8px;font-size:12px;display:flex;position:relative}.filter-select select,.filter-select select:focus,.filter-select select:active{box-shadow:none!important;border:0!important;outline:0!important}.filter-select svg{pointer-events:none;position:absolute;right:5px}.btn-outline-warning{color:#f59f00;border-color:#f59f00}.data-table-wrap{width:100%}.data-table-toolbar{justify-content:space-between;gap:8px;padding:12px 14px;display:flex}.table-search{border:1px solid var(--sion-border);color:#98a2b3;border-radius:7px;align-items:center;gap:8px;width:min(100%,570px);padding:7px 10px;display:flex}.table-search input{width:100%;color:var(--sion-ink);background:0 0;border:0;outline:0;font-size:14px}.table-size{color:var(--sion-muted);align-items:center;gap:7px;font-size:13px;display:flex}.table-size select{border:1px solid var(--sion-border);color:var(--sion-ink);background:var(--sion-card);border-radius:6px;padding:7px 8px;font-size:14px}.table-scroll{position:relative;overflow-x:auto}.table-loading{z-index:2;min-height:160px;color:var(--sion-muted);-webkit-backdrop-filter:blur(1.5px);backdrop-filter:blur(1.5px);background:#ffffffc7;justify-content:center;align-items:center;gap:9px;font-size:12px;display:flex;position:absolute;inset:0}.table-loader{border:2px solid #d6e4f5;border-top-color:var(--sion-primary);border-radius:50%;width:22px;height:22px;animation:.7s linear infinite table-loader-spin}@keyframes table-loader-spin{to{transform:rotate(360deg)}}@media (max-width:640px){.table-loading{min-height:120px;position:sticky;left:0}}@media (prefers-reduced-motion:reduce){.table-loader{animation:none}}.data-table{border-collapse:collapse;width:100%;min-width:700px}.data-table th,.data-table td{border-top:1px solid var(--sion-border);text-align:left;padding:11px 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.btn:disabled{cursor:not-allowed;opacity:.65}[data-bs-theme=dark] .confirm-dialog-backdrop{-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);background:#020617ad}[data-bs-theme=dark] .confirm-dialog{border-color:#94a3b83d;box-shadow:0 28px 70px #0000006b}[data-bs-theme=dark] .confirm-dialog-warning .confirm-dialog-icon{color:#ffd166;background:#f59e0b24}[data-bs-theme=dark] .confirm-dialog-danger .confirm-dialog-icon{color:#ff9b9b;background:#d6393924}[data-bs-theme=dark] .confirm-dialog-primary .confirm-dialog-icon{color:#8bbcff;background:#5b9dff29}[data-bs-theme=dark] .confirm-dialog-actions .btn-outline-secondary{color:var(--sion-ink);background:0 0;border-color:#94a3b86b}[data-bs-theme=dark] .confirm-dialog-actions .btn-outline-secondary:hover:not(:disabled){background:var(--sion-control-strong)}@keyframes confirm-backdrop-in{0%{opacity:0}to{opacity:1}}@keyframes 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14px;display:flex}.user-import-file-button{position:relative;overflow:hidden}.user-import-file-button input{cursor:pointer;opacity:0;width:100%;height:100%;position:absolute;inset:0}.user-import-error{align-items:flex-start;gap:8px;margin:0 0 14px;display:flex}.user-import-error-list{color:#7f1d1d;background:#fff7f7;border:1px solid #fecaca;border-radius:8px;gap:8px;max-height:190px;margin:0 0 14px;padding:12px 14px;font-size:12px;display:grid;overflow:auto}.user-import-error-list>div{grid-template-columns:72px minmax(0,1fr);gap:8px;line-height:1.4;display:grid}.user-import-error-list b{color:#b42318}.user-import-error-list small{color:#9b2c2c}.user-import-success{color:#176b3a;background:#f0fff4;border:1px solid #b7ebc6;border-radius:8px;align-items:center;gap:8px;margin:0 0 14px;padding:11px 13px;font-size:13px;font-weight:700;display:flex}.user-import-success 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0;width:5px;height:9px;transform:rotate(45deg)translateY(-1px)}.import-progress{color:#1e3a8a;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;grid-template-columns:1fr auto;align-items:center;gap:8px 14px;margin-bottom:14px;padding:12px 14px;font-size:13px;font-weight:800;display:grid}.import-progress div{background:#dbeafe;border-radius:999px;grid-column:1/-1;height:8px;overflow:hidden}.import-progress i{border-radius:inherit;background:#2563eb;height:100%;display:block}.import-table-scroll{border:1px solid var(--sion-border);border-radius:8px;max-height:min(420px,100vh - 360px)}.import-preview-modal .data-table{margin:0}.import-preview-modal .modal-actions{margin-top:16px;margin-bottom:0;padding:16px 0 22px}.import-valid{color:#177245;font-weight:800}.import-invalid{color:#c2410c;font-weight:800}@media (max-width:860px){.student-class-toolbar,.student-class-layout{grid-template-columns:1fr}.student-class-toolbar{display:grid}.student-class-toolbar>div{justify-content:flex-start}.class-rail{grid-template-columns:repeat(auto-fit,minmax(142px,1fr))}}.teacher-qr-backdrop{z-index:95;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#0f1b2a9e;place-items:center;padding:24px;display:grid;position:fixed;inset:0}.teacher-qr-modal{width:min(420px,100vw - 32px);color:var(--sion-ink);background:var(--sion-card);border:1px solid #ffffffb8;border-radius:18px;gap:18px;padding:24px;display:grid;box-shadow:0 28px 80px #0f1b2a57}.teacher-qr-heading{justify-content:space-between;align-items:flex-start;gap:16px;display:flex}.teacher-qr-heading h2,.teacher-qr-heading p{margin:0}.teacher-qr-heading h2{letter-spacing:0;margin-top:4px;font-size:24px;line-height:1.15}.icon-button{border:1px solid var(--sion-border);width:38px;height:38px;color:var(--sion-ink);background:var(--sion-control-strong);cursor:pointer;border-radius:10px;flex:none;place-items:center;transition:color .15s,background .15s,border-color .15s;display:inline-grid}.icon-button:hover{color:#b42318;background:#fff1f0;border-color:#b423183d}.teacher-qr-content{justify-items:center;gap:12px;display:grid}.teacher-qr-content img{border:1px solid var(--sion-border);background:#fff;border-radius:16px;width:min(100%,292px);height:auto;padding:14px;display:block;box-shadow:0 12px 28px #0f172a17}.teacher-qr-countdown{width:100%;color:var(--sion-muted);justify-content:center;align-items:center;gap:7px;margin:0;font-size:13px;font-weight:750;display:inline-flex}.teacher-qr-countdown svg{color:var(--sion-primary)}.teacher-qr-note{color:var(--sion-muted);text-align:center;margin:0;font-size:13px;line-height:1.5}.teacher-qr-modal .button{justify-self:center}@media (max-width:520px){.teacher-qr-backdrop{padding:16px}.teacher-qr-modal{border-radius:16px;gap:16px;padding:20px}.teacher-qr-heading h2{font-size:22px}.teacher-qr-content img{width:min(100%,270px);padding:12px}}.sidebar-qr-action{border:1px solid color-mix(in srgb, var(--sion-primary), transparent 72%);width:calc(100% - 6px);color:var(--sion-primary);background:linear-gradient(135deg, var(--sion-primary-soft), color-mix(in srgb, var(--sion-card), transparent 8%));text-align:left;border-radius:10px;align-items:center;gap:11px;margin:0 6px 16px 0;padding:12px 11px;transition:border-color .16s,box-shadow .16s,transform .16s;display:flex;box-shadow:0 8px 18px #206bc414}.sidebar-qr-action:hover{border-color:color-mix(in srgb, var(--sion-primary), transparent 42%);transform:translateY(-1px);box-shadow:0 12px 24px #206bc424}.sidebar-qr-icon{color:#fff;background:var(--sion-primary);border-radius:10px;flex:none;place-items:center;width:40px;height:40px;display:grid;box-shadow:0 6px 12px #206bc438}.sidebar-qr-copy{gap:3px;min-width:0;display:grid}.sidebar-qr-copy strong,.sidebar-qr-copy small{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.sidebar-qr-copy strong{font-size:13px}.sidebar-qr-copy small{color:var(--sion-muted);font-size:11px}.student-permit-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-bottom:18px;display:grid}.teacher-substitution-pane{gap:24px}.substitution-hero{color:#fff;background:linear-gradient(135deg,#10233f 0%,#206bc4 62%,#0f766e 140%);border:1px solid #d7e3f1;border-radius:8px;justify-content:space-between;align-items:center;gap:18px;padding:22px;display:flex;box-shadow:0 18px 40px #0f233f2e}.substitution-hero span,.substitution-section-title span{align-items:center;gap:8px;font-weight:600;display:inline-flex}.substitution-hero h2{letter-spacing:0;margin:8px 0 6px;font-size:26px;font-weight:600}.substitution-hero p{color:#ffffffd1;max-width:760px;margin:0;font-weight:400}.substitution-hero-stat{text-align:center;background:#ffffff1f;border-radius:8px;place-items:center;gap:2px;min-width:150px;padding:14px;display:grid}.substitution-hero-stat strong{font-size:38px;line-height:1}.substitution-hero-stat span{color:#ffffffd1;font-size:12px}.substitution-layout{grid-template-columns:minmax(280px,420px) minmax(0,1fr);gap:18px;margin-top:6px;display:grid}.substitution-form,.substitution-list-card{background:#fff;border:1px solid #d7e3f1;border-radius:8px;box-shadow:0 16px 35px #14213d12}.substitution-form{align-content:start;gap:14px;padding:18px;display:grid}.substitution-section-title{color:#14213d;align-items:center;gap:10px;display:flex}.substitution-section-title>svg{color:#206bc4}.substitution-section-title strong{font-size:17px;font-weight:600;display:block}.substitution-section-title span{color:#6b7f95;font-size:12px}.substitution-form label{color:#304a67;gap:7px;font-size:13px;font-weight:600;display:grid}.substitution-form select,.substitution-form input,.substitution-form textarea,.substitution-actions textarea{color:#14213d;width:100%;font:inherit;background:#f8fbff;border:1px solid #c9d7e8;border-radius:8px;padding:10px 11px}.substitution-form textarea,.substitution-actions textarea{resize:vertical;min-height:92px}.substitution-list-card{min-width:0;overflow:hidden}.substitution-tabs{border-bottom:1px solid #e2ebf5;gap:8px;padding:14px;display:flex}.substitution-tabs button{color:#52677f;background:#f8fbff;border:1px solid #c9d7e8;border-radius:999px;padding:8px 13px;font-weight:600}.substitution-tabs button.active{color:#fff;background:#206bc4;border-color:#206bc4}.substitution-list{gap:12px;padding:14px;display:grid}.substitution-item{background:#fff;border:1px solid #d7e3f1;border-radius:8px;grid-template-columns:minmax(0,1fr) auto;gap:14px;padding:14px;display:grid}.substitution-item.status-pending{border-color:#d7e3f1}.substitution-item.status-accepted{background:#fbfffd;border-color:#c9e8d8}.substitution-item.status-rejected,.substitution-item.status-cancelled{background:snow;border-color:#f0caca}.substitution-status{color:#206bc4;background:#edf4ff;border-radius:999px;width:fit-content;padding:5px 9px;font-size:12px;font-weight:600;display:inline-flex}.substitution-item h3{color:#14213d;margin:9px 0 6px;font-size:18px;font-weight:600}.substitution-item p,.substitution-item small{color:#52677f;align-items:center;gap:7px;margin:0 0 5px;font-weight:400;display:flex}.substitution-item small{color:#6b7f95;align-items:flex-start}.substitution-actions{gap:10px;width:min(260px,34vw);display:grid}.substitution-actions textarea{min-height:74px}.substitution-actions>div{justify-content:flex-end;gap:8px;display:flex}.substitution-action-button{border-radius:4px;align-items:center;gap:6px;min-height:34px;padding:6px 12px;font-weight:500;line-height:1.2;display:inline-flex}.substitution-item-icon{color:#9aabc0;align-self:center}.substitution-empty{color:#6b7f95;text-align:center;border:1px dashed #c9d7e8;border-radius:8px;margin:14px;padding:32px;font-weight:500}[data-bs-theme=dark] .substitution-form,[data-bs-theme=dark] .substitution-list-card{border-color:var(--sion-border);background:var(--sion-card);box-shadow:0 18px 38px #00000042}[data-bs-theme=dark] .substitution-section-title,[data-bs-theme=dark] .substitution-section-title strong,[data-bs-theme=dark] .substitution-item h3{color:var(--sion-ink)}[data-bs-theme=dark] .substitution-section-title span,[data-bs-theme=dark] .substitution-form label,[data-bs-theme=dark] .substitution-item p,[data-bs-theme=dark] .substitution-item small,[data-bs-theme=dark] .substitution-empty{color:var(--sion-muted)}[data-bs-theme=dark] .substitution-form select,[data-bs-theme=dark] .substitution-form input,[data-bs-theme=dark] .substitution-form textarea,[data-bs-theme=dark] .substitution-actions textarea{border-color:var(--sion-border);background:var(--sion-control);color:var(--sion-ink)}[data-bs-theme=dark] .substitution-form select option{background:var(--sion-control);color:var(--sion-ink)}[data-bs-theme=dark] .substitution-form textarea::placeholder,[data-bs-theme=dark] .substitution-actions textarea::placeholder{color:#7f8ea3}[data-bs-theme=dark] .substitution-tabs{border-bottom-color:var(--sion-border)}[data-bs-theme=dark] .substitution-tabs button{border-color:var(--sion-border);background:var(--sion-control);color:var(--sion-muted)}[data-bs-theme=dark] .substitution-tabs button.active{border-color:var(--sion-primary);background:var(--sion-primary);color:#fff}[data-bs-theme=dark] .substitution-item{border-color:var(--sion-border);background:var(--sion-control-strong)}[data-bs-theme=dark] .substitution-item.status-pending{border-color:var(--sion-border)}[data-bs-theme=dark] .substitution-item.status-accepted{background:#2fb3441a;border-color:#2fb34457}[data-bs-theme=dark] .substitution-item.status-rejected,[data-bs-theme=dark] .substitution-item.status-cancelled{background:#d639391a;border-color:#d6393961}[data-bs-theme=dark] .substitution-status{background:var(--sion-primary-soft);color:#8bbcff}[data-bs-theme=dark] .substitution-empty{border-color:var(--sion-border);background:#1018278a}[data-bs-theme=dark] .substitution-item-icon{color:#718197}[data-bs-theme=dark] .teacher-substitution-pane .alert-success{color:#9be7ad;background:#2fb3441f;border-color:#2fb34457}[data-bs-theme=dark] .teacher-substitution-pane .alert-danger{color:#ffb4b4;background:#d639391f;border-color:#d6393961}@media (max-width:900px){.substitution-hero,.substitution-layout,.substitution-item{grid-template-columns:1fr}.substitution-hero{display:grid}.substitution-actions{width:100%}}.monitoring-page{color:#14213d;background:#eef4fb;min-height:100vh;padding:28px;font-family:Arial,Helvetica,sans-serif}.monitoring-shell{flex-direction:column;gap:22px;width:min(1480px,100%);margin:0 auto;display:flex}.monitoring-header{background:#fff;border:1px solid #d7e3f1;border-radius:8px;justify-content:space-between;align-items:flex-start;gap:20px;padding:26px;display:flex;box-shadow:0 18px 45px #14213d14}.monitoring-kicker{color:#206bc4;align-items:center;gap:9px;margin-bottom:10px;font-weight:800;display:inline-flex}.monitoring-header h1{letter-spacing:0;margin:0;font-size:clamp(28px,4vw,48px);line-height:1.05}.monitoring-header p{color:#52677f;margin:10px 0 0;font-size:16px;font-weight:700}.monitoring-period-pill{color:#1b5ea8;background:#edf6ff;border:1px solid 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