:root{--teacher-bg:#f6f2e8;--teacher-bg-soft:#fbf8f2;--teacher-panel:rgba(255,255,255,0.9);--teacher-panel-strong:#ffffff;--teacher-ink:#182230;--teacher-muted:#667589;--teacher-line:rgba(24,34,48,0.1);--teacher-accent:#0f766e;--teacher-accent-rgb:15,118,110;--teacher-accent-soft:#d7f3ef;--teacher-accent-light:#b7ddd9;--teacher-accent-secondary:#4b9993;--teacher-accent-deep:#0b5a54;--teacher-accent-hover:#0d6660;--teacher-wine:#8a3d3d;--teacher-warm:#d7aa55;--teacher-sidebar:#152131;--teacher-sidebar-soft:rgba(255,255,255,0.08);--teacher-shadow:0 22px 60px rgba(20,34,49,0.12);--teacher-radius-lg:30px;--teacher-radius-md:20px;--teacher-radius-sm:14px;--teacher-sidebar-width:clamp(216px,14.5vw,248px);--teacher-sidebar-collapsed-width:clamp(68px,4.5vw,76px);--teacher-sidebar-mobile-width:min(var(--teacher-sidebar-width),calc(100vw - 48px))}*{box-sizing:border-box}body{margin:0;color:var(--teacher-ink);background:radial-gradient(circle at top left,rgba(215,170,85,0.18),transparent 34%),radial-gradient(circle at top right,rgba(var(--teacher-accent-rgb),0.14),transparent 30%),linear-gradient(180deg,#f7f3eb 0%,#f2ede3 100%);font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif}a{text-decoration:none}.teacher-shell{min-height:100vh}.teacher-navbar{position:sticky;top:0;z-index:60;padding:1rem 1.25rem;background:rgba(247,243,235,0.88);backdrop-filter:blur(18px);border-bottom:1px solid rgba(24,34,48,0.08);transition:opacity 0.2s ease,transform 0.2s ease,visibility 0.2s ease}.teacher-shell__brand,.teacher-shell__user,.teacher-shell__user-actions,.teacher-shell__spotlight-actions{display:flex;align-items:center}.teacher-shell__brand{gap:0.9rem}.teacher-shell__sidebar-toggle{color:var(--teacher-ink);padding:0.35rem 0.55rem;border-radius:12px}.teacher-shell__sidebar-toggle i{font-size:1.35rem}.teacher-navbar .navbar-brand{display:flex;align-items:center;gap:0.85rem;color:var(--teacher-ink)}.teacher-navbar .navbar-brand:hover{color:var(--teacher-accent)}.teacher-shell__brand-mark{width:50px;height:50px;border-radius:18px;display:inline-flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--teacher-accent-secondary) 0%,var(--teacher-accent) 100%);color:#fff;box-shadow:0 16px 30px rgba(var(--teacher-accent-rgb),0.2)}.teacher-shell__brand-mark i{font-size:1.3rem}.teacher-navbar .navbar-brand strong{display:block;font-size:1.02rem;letter-spacing:0.02em}.teacher-navbar .navbar-brand small{display:block;color:var(--teacher-muted);font-size:0.8rem}.teacher-shell__user{gap:1rem;margin-left:auto}.teacher-shell__user-meta{flex-direction:column;align-items:flex-end;gap:0.2rem}.teacher-shell__role{padding:0.25rem 0.75rem;border-radius:999px;background:var(--teacher-accent-soft);color:var(--teacher-accent);font-size:0.82rem;font-weight:700}.teacher-shell__date{color:var(--teacher-muted);font-size:0.82rem}.teacher-shell__user-actions{gap:0.6rem}.teacher-shell__icon-btn{width:42px;height:42px;border-radius:14px;display:inline-flex;align-items:center;justify-content:center;color:var(--teacher-ink);background:rgba(255,255,255,0.8);border:1px solid var(--teacher-line);box-shadow:0 8px 18px rgba(20,34,49,0.08);transition:transform 0.2s ease,box-shadow 0.2s ease,color 0.2s ease}.teacher-shell__icon-btn:hover{transform:translateY(-2px);color:var(--teacher-accent);box-shadow:0 14px 24px rgba(20,34,49,0.12)}.teacher-shell__icon-btn--danger:hover{color:var(--teacher-wine)}.teacher-shell__control-btn{border:0}.teacher-shell__fullscreen-controls{position:fixed;top:1rem;right:1rem;z-index:90;display:none}.teacher-shell__fullscreen-exit{display:inline-flex;align-items:center;gap:0.45rem;padding:0.72rem 1rem;border:1px solid rgba(15,23,42,0.1);border-radius:999px;color:#0f172a;background:rgba(255,255,255,0.9);box-shadow:0 16px 34px rgba(15,23,42,0.14);backdrop-filter:blur(16px)}.teacher-shell__fullscreen-exit:hover{color:var(--teacher-accent)}.teacher-shell__layout{display:grid;grid-template-columns:var(--teacher-sidebar-width) minmax(0,1fr);min-height:calc(100vh - 82px);transition:grid-template-columns 0.24s ease}.teacher-shell__sidebar{position:sticky;top:82px;height:calc(100vh - 82px);padding:1.2rem 0.75rem 1rem;background:radial-gradient(circle at top right,rgba(255,255,255,0.06),transparent 24%),linear-gradient(180deg,#152131 0%,#101b29 100%);color:rgba(255,255,255,0.86);overflow-y:auto;transition:width 0.24s ease,padding 0.24s ease,transform 0.24s ease,opacity 0.2s ease,visibility 0.2s ease}.teacher-shell__sidebar-eyebrow,.teacher-shell__nav-label{font-size:0.76rem;letter-spacing:0.16em;text-transform:uppercase;color:rgba(255,255,255,0.46)}.teacher-shell__nav-group + .teacher-shell__nav-group{margin-top:1rem}.teacher-shell__nav-label{margin:0 0 0.55rem 0.6rem}.teacher-shell__sub-group + .teacher-shell__sub-group{margin-top:0.5rem}.teacher-shell__sub-label{display:flex;align-items:center;justify-content:space-between;width:100%;padding:0.6rem 0.75rem;margin:0 0 0.25rem;border:none;border-radius:12px;background:rgba(255,255,255,0.04);color:rgba(255,255,255,0.65);font-size:0.78rem;font-weight:600;letter-spacing:0.06em;cursor:pointer;transition:background 0.2s ease,color 0.2s ease}.teacher-shell__sub-label:hover{background:rgba(255,255,255,0.08);color:rgba(255,255,255,0.9)}.teacher-shell__sub-label i{font-size:0.65rem;transition:transform 0.25s ease}.teacher-shell__sub-group.is-expanded .teacher-shell__sub-label i{transform:rotate(180deg)}.teacher-shell__sub-items{display:grid;gap:0.15rem;overflow:hidden;max-height:0;opacity:0;transition:max-height 0.3s ease,opacity 0.2s ease}.teacher-shell__sub-group.is-expanded .teacher-shell__sub-items{max-height:500px;opacity:1}.teacher-shell__sub-items .nav-link{padding-left:1.3rem;font-size:0.88rem}.teacher-shell__sidebar .nav-link{margin:0 0.1rem 0.3rem;padding:0.78rem 0.85rem;border-radius:16px;display:flex;align-items:center;gap:0.7rem;color:rgba(255,255,255,0.78);transition:transform 0.22s ease,background 0.22s ease,color 0.22s ease}.teacher-shell__sub-label span,.teacher-shell__sidebar .nav-link{white-space:nowrap}.teacher-shell__sidebar .nav-link i{width:20px;text-align:center}.teacher-shell__sidebar .nav-link:hover,.teacher-shell__sidebar .nav-link.active{color:#fff;background:linear-gradient(135deg,rgba(var(--teacher-accent-rgb),0.35),rgba(var(--teacher-accent-rgb),0.16));transform:translateX(2px);box-shadow:inset 0 0 0 1px rgba(255,255,255,0.06)}.teacher-shell__content{padding:1.5rem;display:flex;flex-direction:column;gap:1.25rem;min-width:0}.teacher-shell__spotlight{padding:1.35rem 1.45rem;border-radius:var(--teacher-radius-lg);background:radial-gradient(circle at top right,rgba(255,255,255,0.28),transparent 24%),linear-gradient(135deg,var(--teacher-accent-secondary) 0%,var(--teacher-accent) 54%,var(--teacher-accent-deep) 100%);color:#fff;box-shadow:0 26px 45px rgba(var(--teacher-accent-rgb),0.18);display:flex;justify-content:space-between;gap:1rem;align-items:center;flex-wrap:wrap}.teacher-shell__spotlight h1{margin:0.3rem 0 0.45rem;font-size:clamp(1.5rem,3vw,2rem)}.teacher-shell__spotlight p{margin:0;max-width:640px;color:rgba(255,255,255,0.82)}.teacher-shell__spotlight-kicker{margin:0;font-size:0.82rem;letter-spacing:0.18em;text-transform:uppercase;color:rgba(255,255,255,0.64)}.teacher-shell__spotlight-actions{gap:0.7rem;flex-wrap:wrap}.teacher-shell__action-link{display:inline-flex;align-items:center;gap:0.45rem;padding:0.72rem 1rem;border-radius:999px;background:rgba(255,255,255,0.16);border:1px solid rgba(255,255,255,0.18);color:#fff;transition:transform 0.2s ease,background 0.2s ease}.teacher-shell__action-link:hover{color:#fff;transform:translateY(-2px);background:rgba(255,255,255,0.22)}.teacher-shell__main{min-height:60vh;padding:1.6rem;border-radius:34px;background:rgba(255,255,255,0.76);border:1px solid rgba(255,255,255,0.52);box-shadow:var(--teacher-shadow);backdrop-filter:blur(8px)}@media (min-width: 993px){body.teacher-sidebar-collapsed .teacher-shell__layout{grid-template-columns:var(--teacher-sidebar-collapsed-width) minmax(0,1fr)}body.teacher-sidebar-collapsed .teacher-shell__sidebar{padding:1.2rem 0.5rem 1rem;overflow-x:hidden}body.teacher-sidebar-collapsed .teacher-shell__nav-label,body.teacher-sidebar-collapsed .teacher-shell__sub-label,body.teacher-sidebar-collapsed .teacher-shell__sidebar .nav-link::after{display:none}body.teacher-sidebar-collapsed .teacher-shell__nav-group + .teacher-shell__nav-group{margin-top:0.7rem;padding-top:0.7rem;border-top:1px solid rgba(255,255,255,0.08)}body.teacher-sidebar-collapsed .teacher-shell__sidebar .nav-link{width:52px;min-height:52px;margin-inline:auto;padding:0;justify-content:center}body.teacher-sidebar-collapsed .teacher-shell__sub-items{display:block;max-height:none;opacity:1}body.teacher-sidebar-collapsed .teacher-shell__sub-items .nav-link{padding-left:0}body.teacher-sidebar-collapsed .teacher-shell__sidebar .nav-link{gap:0;font-size:0}body.teacher-sidebar-collapsed .teacher-shell__sidebar .nav-link i{width:auto;font-size:1.2rem}body.teacher-sidebar-collapsed .teacher-shell__sidebar .nav-link:hover,body.teacher-sidebar-collapsed .teacher-shell__sidebar .nav-link.active{transform:translateY(-1px)}}body.teacher-shell-fullscreen{overflow:hidden;background:#f3f6fb}body.teacher-shell-fullscreen .teacher-navbar,body.teacher-shell-fullscreen .teacher-shell__sidebar,body.teacher-shell-fullscreen .teacher-shell__overlay{display:none !important}body.teacher-shell-fullscreen .teacher-shell__fullscreen-controls{display:block}body.teacher-shell-fullscreen .teacher-shell,body.teacher-shell-fullscreen .teacher-shell__layout,body.teacher-shell-fullscreen .teacher-shell__content{min-height:100vh}body.teacher-shell-fullscreen .teacher-shell__layout{display:block}body.teacher-shell-fullscreen .teacher-shell__content{padding:0;gap:0}body.teacher-shell-fullscreen .teacher-shell__main{height:100vh;min-height:100vh;overflow-y:auto;padding:1rem;border:0;border-radius:0;background:#f3f6fb;box-shadow:none;backdrop-filter:none}.teacher-shell__main .card,.teacher-shell__main .modal-content{border-radius:22px;border:1px solid var(--teacher-line);box-shadow:0 18px 30px rgba(20,34,49,0.08)}.teacher-shell__main .btn-primary{background:linear-gradient(135deg,var(--teacher-accent-secondary) 0%,var(--teacher-accent) 100%);border-color:transparent}.teacher-shell__main .btn-primary:hover{background:linear-gradient(135deg,var(--teacher-accent-hover) 0%,var(--teacher-accent-deep) 100%)}.teacher-shell__main .btn-outline-primary{color:var(--teacher-accent-secondary);border-color:rgba(var(--teacher-accent-rgb),0.35)}.teacher-shell__main .btn-outline-primary:hover{background:var(--teacher-accent-secondary);border-color:var(--teacher-accent-secondary);color:#fff}.teacher-shell__main .btn:focus-visible,.teacher-shell__icon-btn:focus-visible,.teacher-shell__sidebar .nav-link:focus-visible,.teacher-shell__action-link:focus-visible{outline:3px solid rgba(20,95,118,0.25);outline-offset:3px}.teacher-shell__main .table-responsive{border-radius:20px;overflow:hidden}.teacher-shell__main .form-control,.teacher-shell__main .form-select{border-radius:14px;min-height:44px;border-color:rgba(20,34,49,0.12)}.teacher-shell__main .form-control:focus,.teacher-shell__main .form-select:focus{border-color:rgba(20,95,118,0.55);box-shadow:0 0 0 0.25rem rgba(20,95,118,0.12)}.teacher-shell__main .pagination .page-link{border-radius:12px;border:none;color:#305062;margin:0 0.15rem;box-shadow:0 8px 16px rgba(20,34,49,0.05)}.teacher-shell__main .pagination .page-item.active .page-link{background:linear-gradient(135deg,var(--teacher-accent-secondary) 0%,var(--teacher-accent) 100%);color:#fff}.teacher-shell__main .alert{border:none;border-radius:18px;box-shadow:0 12px 24px rgba(20,34,49,0.08)}.teacher-shell__overlay{position:fixed;inset:0;background:rgba(0,0,0,0.32);opacity:0;pointer-events:none;transition:opacity 0.25s ease;z-index:45}.teacher-shell__sidebar.open~.teacher-shell__overlay,.teacher-shell__sidebar.open + .teacher-shell__content + .teacher-shell__overlay{opacity:1;pointer-events:auto}@media (max-width: 1200px){.teacher-shell__layout{grid-template-columns:var(--teacher-sidebar-width) minmax(0,1fr)}.teacher-shell__content{padding:1.2rem}}@media (max-width: 992px){.teacher-shell__layout{grid-template-columns:1fr}.teacher-shell__sidebar{position:fixed;top:0;left:calc(-1 * var(--teacher-sidebar-mobile-width));width:var(--teacher-sidebar-mobile-width);height:100vh;z-index:50;transition:transform 0.3s ease;box-shadow:18px 0 44px rgba(0,0,0,0.22)}.teacher-shell__sidebar.open{transform:translateX(var(--teacher-sidebar-mobile-width))}.teacher-shell__content{padding:1rem}.teacher-shell__main{padding:1.1rem;border-radius:26px}}@media (max-width: 768px){.teacher-navbar{padding:0.9rem 0.85rem}.teacher-shell__spotlight{padding:1.15rem;border-radius:24px}.teacher-shell__action-link{width:100%;justify-content:center}.teacher-shell__user{gap:0.65rem}}:root{--page-panel-border:rgba(24,34,48,0.08);--page-panel-shadow:0 18px 34px rgba(24,34,48,0.08);--page-soft-bg:#faf8f3}.page-header{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:1.5rem}.page-header__title{margin:0}.page-header__subtitle{margin-top:0.35rem;color:#6b7c8f;font-size:0.95rem}.page-header__actions{display:flex;flex-wrap:wrap;gap:0.75rem}.dashboard-hero{position:relative;overflow:hidden;padding:1.3rem 1.4rem;border-radius:26px;color:#fff;background:radial-gradient(circle at top right,rgba(255,255,255,0.22),transparent 24%),linear-gradient(135deg,var(--teacher-accent-secondary) 0%,var(--teacher-accent) 52%,var(--teacher-accent-deep) 100%);box-shadow:0 22px 40px rgba(var(--teacher-accent-rgb),0.16)}.dashboard-hero::after{content:'';position:absolute;right:-40px;bottom:-52px;width:220px;height:220px;border-radius:50%;background:rgba(255,255,255,0.1)}.dashboard-hero>*{position:relative;z-index:1}.hero-kicker{display:inline-flex;align-items:center;gap:0.45rem;padding:0.38rem 0.8rem;border-radius:999px;background:rgba(255,255,255,0.14);font-size:0.86rem}.hero-meta{display:flex;flex-wrap:wrap;gap:0.7rem;margin-top:0.9rem}.hero-chip{display:inline-flex;align-items:center;gap:0.45rem;padding:0.55rem 0.86rem;border-radius:999px;background:rgba(8,31,38,0.18);border:1px solid rgba(255,255,255,0.12)}.dashboard-quick-actions .dashboard-panel__body{padding-top:0.9rem}.quick-action-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0.9rem}.quick-action-card{display:block;padding:1rem 1.05rem;border-radius:20px;border:1px solid rgba(24,34,48,0.08);background:linear-gradient(180deg,#fff 0%,#f8fbfd 100%);color:#1d2d3b;transition:transform 0.2s ease,box-shadow 0.2s ease}.quick-action-card:hover{color:#1d2d3b;transform:translateY(-2px);box-shadow:0 16px 28px rgba(24,34,48,0.1)}.quick-action-card .icon-wrap{width:2.6rem;height:2.6rem;display:inline-flex;align-items:center;justify-content:center;border-radius:16px;margin-bottom:0.75rem;background:rgba(var(--teacher-accent-rgb),0.12);color:var(--teacher-accent)}.quick-action-card strong{display:block;margin-bottom:0.35rem}.quick-action-card small{display:block;color:#708295;line-height:1.5}.hero-actions{display:grid;gap:0.8rem}.hero-action-card{display:block;padding:1rem;border-radius:20px;color:#fff;border:1px solid rgba(255,255,255,0.12);background:rgba(255,255,255,0.12);transition:transform 0.2s ease,background 0.2s ease}.hero-action-card:hover{color:#fff;transform:translateY(-2px);background:rgba(255,255,255,0.18)}.hero-action-card .icon-wrap{width:2.75rem;height:2.75rem;display:inline-flex;align-items:center;justify-content:center;border-radius:16px;background:rgba(255,255,255,0.16);margin-bottom:0.7rem}.dashboard-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1rem}.dashboard-metric,.dashboard-panel{border-radius:24px;border:1px solid var(--page-panel-border);background:rgba(255,255,255,0.88);box-shadow:var(--page-panel-shadow)}.dashboard-metric{padding:1.2rem}.dashboard-metric__icon{width:3rem;height:3rem;display:inline-flex;align-items:center;justify-content:center;border-radius:18px;margin-bottom:0.9rem;font-size:1.2rem}.dashboard-metric__value{font-size:2rem;font-weight:800;line-height:1;color:#142433}.dashboard-metric__label{margin-top:0.45rem;font-weight:700;color:#304458}.dashboard-metric__note{margin-top:0.45rem;color:#6b7c8f;font-size:0.92rem}.dashboard-panel{overflow:hidden}.dashboard-panel__header{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;padding:1.2rem 1.25rem 0}.dashboard-panel__header h5{margin:0}.dashboard-panel__header small{color:#708295}.dashboard-panel__body{padding:1.15rem 1.25rem 1.25rem}.dashboard-list{display:grid;gap:0.75rem}.dashboard-list__item{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;padding:0.95rem 1rem;border-radius:18px;border:1px solid var(--page-panel-border);background:var(--page-soft-bg)}.dashboard-list__item strong{display:block;color:#1d2d3b}.dashboard-list__item small{display:block;margin-top:0.28rem;color:#708295}.tone-pill{display:inline-flex;align-items:center;padding:0.35rem 0.72rem;border-radius:999px;font-size:0.82rem;font-weight:700;white-space:nowrap}.tone-primary{background:#dff0ff;color:#135e93}.tone-success{background:#dff7ef;color:#0f6b52}.tone-warning{background:#fff1d8;color:#a16800}.tone-neutral{background:#edf1f5;color:#55677a}.dashboard-empty{padding:1.3rem;text-align:center;border-radius:18px;background:#f8f5ef;color:#6e7d8b}.dashboard-chart{display:grid;gap:0.65rem}.dashboard-chart__row{display:grid;grid-template-columns:72px 1fr auto;align-items:center;gap:0.75rem}.dashboard-chart__bar{height:10px;border-radius:999px;background:#e9eef2;overflow:hidden}.dashboard-chart__bar>span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--teacher-accent-secondary) 0%,var(--teacher-accent) 100%)}.announcement-card{padding:1rem;border-radius:18px;border:1px solid var(--page-panel-border);background:var(--page-soft-bg)}.announcement-card + .announcement-card{margin-top:0.8rem}.class-card{transition:all 0.3s}.class-card:hover{transform:translateY(-5px)}.student-tag{display:inline-block;padding:4px 12px;margin:4px;background:#e9ecef;border-radius:20px;font-size:14px}.student-tag .btn-remove{padding:0 4px;margin-left:4px;font-size:12px;color:#dc3545;cursor:pointer}.student-tag .btn-remove:hover{color:#c82333}.modal-body{max-height:60vh;overflow-y:auto}.summary-bar,.filter-panel,.checkin-toolbar,.publish-card{border:1px solid rgba(0,0,0,0.08);border-radius:16px;background:#fff;box-shadow:0 8px 18px rgba(15,23,42,0.08)}.summary-bar{padding:0.5rem 0.75rem}.summary-row,.checkin-summary{display:flex;flex-wrap:wrap;gap:0.75rem;align-items:center;justify-content:space-between}.summary-chip,.checkin-chip{min-width:110px;padding:0.65rem 0.9rem;border:1px solid rgba(33,37,41,0.1);border-radius:12px;background:#fefefe;box-shadow:0 3px 6px rgba(0,0,0,0.05);text-align:center}.summary-chip small,.checkin-chip small{display:block;letter-spacing:0.03em;font-size:0.65rem;color:#6c757d}.summary-chip strong,.checkin-chip strong{display:block;font-size:1.15rem}.summary-search,.checkin-search{flex:1;min-width:280px}.summary-search .form-control{border-top-right-radius:0;border-bottom-right-radius:0}.summary-search .btn{border-top-left-radius:0;border-bottom-left-radius:0}.view-toggle{display:flex;gap:5px}.view-toggle .btn{padding:6px 12px}.view-toggle .btn.active{background-color:var(--teacher-accent-secondary);color:#fff;border-color:var(--teacher-accent-secondary)}.table-view th{background-color:var(--teacher-accent-secondary);color:#fff;font-weight:500}.table-view .actions{white-space:nowrap}.table-view .actions .btn{padding:4px 8px;font-size:12px}.filter-panel{background:var(--bs-light,#f8f9fa)}.filter-panel .form-label{font-size:0.75rem;letter-spacing:0.04em;text-transform:uppercase}.analysis-summary{font-size:0.8rem;color:var(--bs-gray-600,#6c757d)}.analysis-progress{height:6px;border-radius:999px;overflow:hidden;background:var(--bs-gray-200,#e9ecef);width:100%}.analysis-progress .progress-bar{background:linear-gradient(90deg,var(--bs-primary),var(--bs-success))}.checkin-tools{display:flex;gap:0.5rem;flex-wrap:wrap}.checkin-card{border-width:2px}.notice-btn{border-style:dashed}.notice-btn:hover{transform:translateY(-1px)}.checkin-toolbar{display:flex;flex-wrap:wrap;gap:0.75rem;margin-bottom:1rem;padding:0.85rem 1rem;align-items:center;justify-content:space-between}.checkin-search{display:flex;gap:0.5rem;align-items:center}.publish-shell{display:grid;grid-template-columns:1fr;gap:1rem}.publish-card{border-left:4px solid #3498db}.notice-preview{white-space:pre-wrap;font-family:"Consolas","Monaco",monospace;font-size:0.9rem;background:#f8fbff;border:1px dashed #a7c8e6;border-radius:0.75rem;padding:0.85rem;min-height:110px}@media (max-width: 1200px){.dashboard-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width: 767px){.dashboard-grid{grid-template-columns:1fr}.quick-action-grid{grid-template-columns:1fr}.page-header{align-items:flex-start}.page-header__actions{width:100%}.page-header__actions .btn{flex:1 1 auto}.checkin-search{flex-direction:column;align-items:stretch}.dashboard-panel__body{overflow-x:auto}.table-responsive{font-size:13px}.summary-bar{overflow-x:auto}.summary-row{flex-direction:column;gap:10px}.summary-search{width:100%}.summary-chips{flex-wrap:wrap}}.oa-hero{background:linear-gradient(135deg,#eff8ff 0%,#f7f2ff 100%);border:1px solid #d9e8ff;border-radius:14px;padding:1rem 1.2rem;margin-bottom:1rem}.oa-card{border:1px solid #e9ecef}.oa-card .card-footer{border-top:1px dashed #dfe6ee}.oa-toolbar{display:flex;flex-wrap:wrap;gap:0.75rem;align-items:center;justify-content:space-between;margin-bottom:1.5rem}.oa-search{flex:1;min-width:260px;display:flex;gap:0.5rem;align-items:center}.oa-summary{display:flex;flex-wrap:wrap;gap:0.5rem}.oa-chip{padding:0.65rem 0.9rem;border-radius:12px;border:1px solid rgba(33,37,41,0.12);background:#fff;box-shadow:0 8px 18px rgba(15,23,42,0.08);min-width:120px;text-align:center}.oa-chip small{display:block;font-size:0.68rem;letter-spacing:0.03em;text-transform:uppercase;color:#6c757d}.oa-chip strong{font-size:1.15rem}.editor-panel{border:1px solid rgba(24,34,48,0.08);border-radius:24px;background:rgba(255,255,255,0.92);box-shadow:0 18px 34px rgba(24,34,48,0.08)}.editor-panel .card,.editor-panel .shadow-sm{border-radius:20px}.editor-panel .badge.rounded-pill{letter-spacing:0.02em}.chat-list__group-title{font-size:0.82rem;font-weight:600;color:var(--teacher-muted);letter-spacing:0.04em;padding-left:0.25rem}.chat-list__item{display:flex;align-items:center;gap:0.85rem;padding:0.9rem 1rem;border-radius:16px;transition:background 0.2s ease,transform 0.15s ease;text-decoration:none;color:inherit}.chat-list__item:hover{background:rgba(var(--teacher-accent-rgb),0.06);transform:translateX(2px)}.chat-list__avatar{width:44px;height:44px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:1.05rem;font-weight:700;color:#fff;flex-shrink:0;background:linear-gradient(135deg,var(--teacher-accent-secondary) 0%,var(--teacher-accent) 100%);box-shadow:0 6px 14px rgba(var(--teacher-accent-rgb),0.2)}.chat-list__info{flex:1;min-width:0}.chat-list__name{font-size:0.95rem;font-weight:600;color:var(--teacher-ink);margin-bottom:0.15rem}.chat-list__preview{font-size:0.82rem;color:var(--teacher-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-list__meta{display:flex;flex-direction:column;align-items:flex-end;gap:0.35rem;flex-shrink:0}.chat-list__time{font-size:0.72rem;color:var(--teacher-muted)}.chat-list__badge{min-width:20px;height:20px;padding:0 6px;border-radius:10px;background:linear-gradient(135deg,#dc3545 0%,#c82333 100%);color:#fff;font-size:0.7rem;font-weight:700;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 10px rgba(220,53,69,0.3)}.chat-list__empty{text-align:center;padding:3rem 1rem;color:var(--teacher-muted)}.chat-list__empty i{font-size:3rem;opacity:0.4;display:block;margin-bottom:1rem}.chat-conversation{display:flex;flex-direction:column;height:calc(100vh - 160px);background:#f8f9fa;border-radius:20px;overflow:hidden}.chat-header{display:flex;align-items:center;gap:0.85rem;padding:1rem 1.25rem;background:#fff;border-bottom:1px solid rgba(0,0,0,0.06)}.chat-header__avatar{width:40px;height:40px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:0.95rem;font-weight:700;color:#fff;background:linear-gradient(135deg,var(--teacher-accent-secondary) 0%,var(--teacher-accent) 100%)}.chat-header__info h5{margin:0;font-size:1rem;font-weight:600}.chat-header__info small{font-size:0.78rem;color:var(--teacher-muted)}.chat-messages{flex:1;overflow-y:auto;padding:1.25rem;display:flex;flex-direction:column;gap:0.75rem}.chat-time-divider{text-align:center;margin:0.5rem 0}.chat-time-divider span{display:inline-block;padding:0.25rem 0.85rem;background:rgba(0,0,0,0.05);border-radius:10px;font-size:0.72rem;color:var(--teacher-muted)}.chat-bubble{display:flex;gap:0.6rem;max-width:75%}.chat-bubble--sent{align-self:flex-end;flex-direction:row-reverse}.chat-bubble--received{align-self:flex-start}.chat-bubble__avatar{width:32px;height:32px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:0.75rem;font-weight:700;color:#fff;flex-shrink:0;margin-top:2px}.chat-bubble--sent .chat-bubble__avatar{background:linear-gradient(135deg,var(--teacher-accent-secondary) 0%,var(--teacher-accent) 100%)}.chat-bubble--received .chat-bubble__avatar{background:linear-gradient(135deg,#6c757d 0%,#495057 100%)}.chat-bubble__body{display:flex;flex-direction:column;gap:0.25rem}.chat-bubble__content{padding:0.7rem 1rem;border-radius:16px;line-height:1.55;word-wrap:break-word;white-space:pre-wrap}.chat-bubble--sent .chat-bubble__content{background:linear-gradient(135deg,var(--teacher-accent-secondary) 0%,var(--teacher-accent) 100%);color:#fff;border-bottom-right-radius:6px;box-shadow:0 4px 12px rgba(var(--teacher-accent-rgb),0.2)}.chat-bubble--received .chat-bubble__content{background:#fff;color:var(--teacher-ink);border-bottom-left-radius:6px;box-shadow:0 2px 8px rgba(0,0,0,0.06)}.chat-bubble__time{font-size:0.68rem;color:var(--teacher-muted);padding:0 0.25rem}.chat-bubble--sent .chat-bubble__time{text-align:right}.chat-bubble__image{padding:0.3rem;background:transparent !important;box-shadow:none !important}.chat-bubble__image img{max-width:200px;max-height:200px;border-radius:12px;cursor:pointer;transition:transform 0.2s ease}.chat-bubble__image img:hover{transform:scale(1.02)}.chat-bubble__sticker{padding:0.3rem;background:transparent !important;box-shadow:none !important}.chat-bubble__sticker img{width:100px;height:100px;object-fit:contain}.chat-input-bar{display:flex;align-items:center;gap:0.75rem;padding:0.85rem 1rem;background:#fff;border-top:1px solid rgba(0,0,0,0.06)}.chat-input-bar .form-control{border-radius:14px;padding:0.65rem 1rem;border-color:rgba(0,0,0,0.1);font-size:0.92rem;transition:border-color 0.2s ease,box-shadow 0.2s ease}.chat-input-bar .form-control:focus{border-color:rgba(var(--teacher-accent-rgb),0.4);box-shadow:0 0 0 0.2rem rgba(var(--teacher-accent-rgb),0.1)}.chat-input-bar .btn{border-radius:14px;padding:0.65rem 1.15rem;font-weight:600;background:linear-gradient(135deg,var(--teacher-accent-secondary) 0%,var(--teacher-accent) 100%);border:none;box-shadow:0 4px 12px rgba(var(--teacher-accent-rgb),0.2);transition:transform 0.15s ease,box-shadow 0.15s ease}.chat-input-bar .btn:hover{transform:translateY(-1px);box-shadow:0 6px 16px rgba(var(--teacher-accent-rgb),0.3)}.chat-input-bar .btn:active{transform:translateY(0)}.chat-input-bar .btn-outline-secondary{background:transparent;border:1px solid rgba(0,0,0,0.15);color:var(--teacher-muted);box-shadow:none;padding:0.65rem 0.85rem}.chat-input-bar .btn-outline-secondary:hover{background:rgba(0,0,0,0.05);color:var(--teacher-ink);transform:none;box-shadow:none}.sticker-panel{position:absolute;bottom:70px;left:10px;right:10px;background:#fff;border-radius:16px;box-shadow:0 8px 30px rgba(0,0,0,0.15);z-index:100;max-height:350px;display:flex;flex-direction:column}.sticker-panel__header{display:flex;justify-content:space-between;align-items:center;padding:0.75rem 1rem;border-bottom:1px solid rgba(0,0,0,0.08);font-weight:600;font-size:0.95rem}.sticker-panel__header .btn-close{padding:0.5rem;font-size:0.8rem}.sticker-panel__tabs{display:flex;gap:0.5rem;padding:0.75rem 1rem;border-bottom:1px solid rgba(0,0,0,0.08);overflow-x:auto}.sticker-panel__tabs .btn{white-space:nowrap;font-size:0.82rem;padding:0.4rem 0.8rem;border-radius:10px}.sticker-panel__content{display:grid;grid-template-columns:repeat(auto-fill,minmax(70px,1fr));gap:0.5rem;padding:1rem;overflow-y:auto;max-height:220px}.sticker-item{display:flex;align-items:center;justify-content:center;padding:0.5rem;border-radius:10px;cursor:pointer;transition:background 0.2s ease,transform 0.15s ease}.sticker-item:hover{background:rgba(0,0,0,0.05);transform:scale(1.1)}.sticker-item img{width:50px;height:50px;object-fit:contain}.min-width-0{min-width:0}