:root {
  --bg:#f3f5f2; --surface:#fff; --soft:#f7f8f6; --ink:#172019; --muted:#69746d;
  --line:#dce3dd; --green:#226a4b; --green-dark:#174b36; --green-soft:#e4f1e9;
  --lime:#c9df7a; --yellow:#f6dda0; --red:#b64f49; --red-soft:#fae9e7;
  --blue:#426b8a; --blue-soft:#eaf1f7; --purple:#6c5aa1; --shadow:0 18px 50px rgba(27,50,35,.09);
  --sidebar:264px; --radius:18px;
}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;color:var(--ink);background:var(--bg);font:14px/1.45 Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
button,input,select,textarea{font:inherit} button{cursor:pointer} a{color:inherit;text-decoration:none}.hidden{display:none!important}.muted{color:var(--muted)}.tiny{font-size:12px}.eyebrow{display:block;color:var(--muted);font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.eyebrow.light{color:#b9d0c5}
.brand{display:flex;align-items:center;gap:11px}.brand-mark{width:42px;height:42px;display:grid;place-items:center;border-radius:13px;color:var(--green-dark);background:var(--lime);font-size:21px;font-weight:900}.brand strong,.brand small{display:block}.brand strong{font-size:17px}.brand small{margin-top:2px;font-size:11px}.brand-light{color:#fff}.brand-light small{color:#aac2b7}
.login-screen{min-height:100vh;display:grid;grid-template-columns:minmax(420px,1.1fr) minmax(460px,.9fr)}.login-visual{position:relative;overflow:hidden;padding:38px 48px;display:flex;flex-direction:column;color:#fff;background:linear-gradient(145deg,#143c2d,#256b4d)}.login-visual:before,.login-visual:after{content:"";position:absolute;border-radius:50%;background:rgba(201,223,122,.1)}.login-visual:before{width:560px;height:560px;right:-190px;bottom:-270px}.login-visual:after{width:270px;height:270px;right:70px;top:90px}.login-copy{position:relative;z-index:1;margin:auto 0;max-width:620px}.login-copy h1{margin:15px 0 18px;font-size:clamp(38px,5vw,66px);line-height:1.04;letter-spacing:-.04em}.login-copy p{max-width:580px;color:#c7d9d0;font-size:18px}.security-points{margin-top:32px;display:flex;gap:12px;flex-wrap:wrap}.security-points span{padding:9px 12px;border:1px solid rgba(255,255,255,.16);border-radius:999px;background:rgba(255,255,255,.07);font-size:12px}.login-panel{padding:40px;display:grid;place-items:center;background:#f8faf8}.login-card{width:min(440px,100%);padding:38px;border:1px solid var(--line);border-radius:24px;background:#fff;box-shadow:var(--shadow)}.login-card h2{margin:8px 0 5px;font-size:30px}.login-card>label,.form-field{display:block;margin-top:18px;color:#405047;font-size:12px;font-weight:750}.login-card input,.field,input,select,textarea{width:100%;margin-top:7px;padding:11px 12px;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:10px;outline:none}.login-card input:focus,.field:focus,input:focus,select:focus,textarea:focus{border-color:#85b099;box-shadow:0 0 0 3px rgba(34,106,75,.1)}.form-error{min-height:21px;margin:10px 0 0;color:var(--red);font-size:12px}.demo-accounts{margin-top:22px;padding-top:18px;border-top:1px solid var(--line)}.demo-accounts>strong{display:block;margin-bottom:9px}.demo-button{width:100%;margin-top:7px;padding:9px 10px;display:flex;justify-content:space-between;border:1px solid var(--line);border-radius:9px;background:var(--soft);color:var(--ink);font-size:11px}.demo-button:hover{border-color:#9eb9a9}.demo-button code{color:var(--green-dark)}
.primary-button,.secondary-button,.danger-button,.text-button{min-height:39px;padding:9px 14px;border-radius:10px;border:1px solid transparent;font-weight:750}.primary-button{color:#fff;background:var(--green)}.primary-button:hover{background:var(--green-dark)}.secondary-button{color:var(--green-dark);background:#fff;border-color:var(--line)}.danger-button{color:var(--red);background:var(--red-soft)}.text-button{padding:6px;color:var(--green);background:transparent}.large-button{width:100%;min-height:48px}.small-button{min-height:32px;padding:6px 10px;font-size:12px}.button-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.app-shell{min-height:100vh}.sidebar{position:fixed;inset:0 auto 0 0;z-index:30;width:var(--sidebar);padding:25px 18px 18px;display:flex;flex-direction:column;color:#eef5f0;background:#173f30}.role-card{margin:26px 0 20px;padding:12px;display:flex;align-items:center;gap:10px;border-radius:13px;background:rgba(255,255,255,.08)}.role-icon{width:37px;height:37px;display:grid;place-items:center;border-radius:11px;color:var(--green-dark);background:var(--lime);font-weight:900}.role-card strong,.role-card small{display:block}.role-card small{margin-top:3px;color:#a9c1b6;font-size:11px}.nav-list{display:flex;flex-direction:column;gap:5px}.nav-list button{min-height:44px;padding:10px 11px;display:flex;align-items:center;gap:11px;color:#bed1c7;background:transparent;border:0;border-radius:11px;text-align:left}.nav-list button:hover{color:#fff;background:rgba(255,255,255,.07)}.nav-list button.active{color:var(--green-dark);background:#f1f5f2;font-weight:800}.nav-symbol{width:22px;font-size:17px;text-align:center}.sidebar-security{margin-top:auto;padding:12px;display:flex;gap:9px;border:1px solid rgba(255,255,255,.1);border-radius:12px;background:rgba(255,255,255,.04)}.sidebar-security span{color:var(--lime);font-size:18px}.sidebar-security strong,.sidebar-security small{display:block}.sidebar-security strong{font-size:11px}.sidebar-security small{margin-top:3px;color:#99b2a6;font-size:9px}.logout-button{margin-top:10px;padding:10px;color:#c5d4cd;background:transparent;border:0;border-radius:10px;text-align:left}.logout-button:hover{background:rgba(255,255,255,.07)}
.main-area{min-height:100vh;margin-left:var(--sidebar)}.topbar{position:sticky;top:0;z-index:20;min-height:76px;padding:14px 30px;display:flex;align-items:center;gap:15px;border-bottom:1px solid rgba(220,227,221,.85);background:rgba(243,245,242,.92);backdrop-filter:blur(14px)}.topbar strong{display:block;margin-top:3px;font-size:17px}.topbar-actions{margin-left:auto;display:flex;align-items:center;gap:12px}.secure-badge{padding:7px 9px;color:var(--green-dark);background:var(--green-soft);border-radius:999px;font-size:10px;font-weight:800}.avatar-button{width:39px;height:39px;border:0;border-radius:12px;color:#4d3024;background:#d8baa5;font-weight:850}.mobile-menu{display:none;width:40px;height:40px;border:1px solid var(--line);border-radius:10px;background:#fff}.content{max-width:1500px;margin:0 auto;padding:30px 32px 54px}.page-heading{margin-bottom:22px;display:flex;align-items:flex-end;justify-content:space-between;gap:20px}.page-heading h1{margin:7px 0 5px;font-size:31px;letter-spacing:-.025em}.page-heading p{max-width:760px;margin:0;color:var(--muted)}
.grid{display:grid;gap:16px}.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.card{padding:20px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:0 8px 30px rgba(31,54,40,.04)}.metric-card .metric{margin:10px 0 4px;font-size:35px;font-weight:900}.metric-card p{margin:0;color:var(--muted);font-size:12px}.card-head{margin-bottom:15px;display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.card-head h2,.card-head h3{margin:0}.card-head h2{font-size:19px}.card-head h3{font-size:16px}.section-space{margin-top:17px}.empty-state{padding:35px 18px;text-align:center;color:var(--muted)}
.status{display:inline-flex;align-items:center;gap:5px;padding:5px 8px;border-radius:999px;font-size:10px;font-weight:800}.status.active,.status.confirmed,.status.completed,.status.open{color:var(--green-dark);background:var(--green-soft)}.status.requested,.status.reserved,.status.in_progress{color:#765817;background:#fff2c9}.status.suspended,.status.declined,.status.cancelled,.status.high{color:var(--red);background:var(--red-soft)}.status.planned,.status.closed,.status.booked,.status.normal{color:#50626f;background:var(--blue-soft)}.status.low,.status.paused{color:#63577d;background:#f0ecf8}
.data-list{display:flex;flex-direction:column}.data-row{padding:13px 0;display:grid;grid-template-columns:minmax(160px,1.4fr) minmax(130px,1fr) auto;align-items:center;gap:14px;border-bottom:1px solid #edf0ed}.data-row:last-child{border-bottom:0}.row-main strong,.row-main small{display:block}.row-main small{margin-top:4px;color:var(--muted);font-size:11px}.date-chip{min-width:115px;color:#35463d}.date-chip strong,.date-chip small{display:block}.date-chip small{color:var(--muted)}
.student-grid{display:grid;grid-template-columns:repeat(3,minmax(250px,1fr));gap:14px}.student-card{padding:18px;border:1px solid var(--line);border-radius:16px;background:#fff}.student-card-head{display:flex;align-items:center;gap:11px}.student-avatar{width:45px;height:45px;display:grid;place-items:center;border-radius:14px;color:var(--green-dark);background:var(--green-soft);font-weight:900}.student-card h3{margin:0}.student-card p{margin:13px 0;color:var(--muted);min-height:40px}.student-card footer{display:flex;align-items:center;justify-content:space-between;gap:8px}.progress-line{display:flex;align-items:center;gap:9px}.progress-line progress{width:100%;height:9px;accent-color:var(--green)}
.split-layout{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(300px,.65fr);gap:17px}.form-card label{display:block;margin-bottom:14px;color:#415048;font-size:12px;font-weight:750}.form-card textarea{min-height:100px;resize:vertical}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.form-actions{margin-top:15px;display:flex;justify-content:flex-end;gap:8px}.inline-form{padding:15px;border:1px solid var(--line);border-radius:13px;background:var(--soft)}.plan-item{padding:12px;display:grid;grid-template-columns:minmax(190px,1.7fr) minmax(125px,.7fr) minmax(105px,.6fr) 36px;align-items:end;gap:9px;border:1px solid var(--line);border-radius:12px;background:#fff}.plan-item+.plan-item{margin-top:9px}.plan-item label{margin:0}.icon-delete{width:36px;height:39px;border:0;border-radius:9px;color:var(--red);background:var(--red-soft)}
.calendar-columns{display:grid;grid-template-columns:1fr 1fr;gap:16px}.slot-card,.request-card{padding:14px;display:flex;align-items:center;gap:12px;border:1px solid var(--line);border-radius:13px;background:#fff}.slot-card+.slot-card,.request-card+.request-card{margin-top:9px}.slot-card>div,.request-card>div{min-width:0;flex:1}.slot-card strong,.slot-card small,.request-card strong,.request-card small{display:block}.slot-card small,.request-card small{margin-top:4px;color:var(--muted)}
.hero-card{position:relative;overflow:hidden;padding:27px;color:#fff;background:linear-gradient(125deg,#194734,#2b7755);border:0}.hero-card:after{content:"";position:absolute;right:-45px;top:-75px;width:230px;height:230px;border-radius:50%;background:rgba(201,223,122,.18)}.hero-card h1{position:relative;z-index:1;margin:9px 0;font-size:30px}.hero-card p{position:relative;z-index:1;max-width:720px;color:#c8ddd2}.hero-card .button-row{position:relative;z-index:1;margin-top:20px}.hero-card .primary-button{color:var(--green-dark);background:var(--lime)}.practice-card{min-height:150px;display:flex;flex-direction:column}.practice-card .practice-icon{width:43px;height:43px;display:grid;place-items:center;border-radius:13px;background:var(--green-soft);font-size:20px}.practice-card h3{margin:12px 0 4px}.practice-card p{margin:0;color:var(--muted)}.practice-card footer{margin-top:auto;padding-top:15px}
.account-security{max-width:720px}.security-note{padding:14px;display:flex;gap:10px;border-radius:12px;color:var(--green-dark);background:var(--green-soft)}.audit-list{max-height:520px;overflow:auto}.audit-row{padding:10px 0;border-bottom:1px solid var(--line);font-size:11px}.audit-row strong{display:block}.audit-row small{color:var(--muted)}.toast{position:fixed;right:24px;bottom:24px;z-index:100;max-width:380px;padding:12px 16px;color:#fff;background:#163e2e;border-radius:11px;box-shadow:var(--shadow);opacity:0;transform:translateY(12px);pointer-events:none;transition:.24s}.toast.show{opacity:1;transform:translateY(0)}.toast.error{background:#803a36}
@media(max-width:1120px){.grid-4{grid-template-columns:repeat(2,1fr)}.student-grid,.grid-3{grid-template-columns:repeat(2,1fr)}.split-layout{grid-template-columns:1fr}.calendar-columns{grid-template-columns:1fr}}
@media(max-width:820px){:root{--sidebar:250px}.sidebar{left:calc(-1 * var(--sidebar));transition:left .22s}.menu-open .sidebar{left:0;box-shadow:20px 0 55px rgba(0,0,0,.24)}.main-area{margin-left:0}.mobile-menu{display:block}.content{padding:23px 18px 45px}.topbar{padding:13px 18px}.secure-badge{display:none}.login-screen{grid-template-columns:1fr}.login-visual{min-height:300px;padding:28px}.login-copy h1{font-size:38px}.login-copy p{font-size:15px}.login-panel{padding:25px}.login-card{padding:27px}}
@media(max-width:580px){.grid-4,.grid-3,.grid-2,.student-grid{grid-template-columns:1fr}.page-heading{align-items:flex-start;flex-direction:column}.form-grid{grid-template-columns:1fr}.plan-item{grid-template-columns:1fr 1fr}.plan-item>label:first-child{grid-column:1/-1}.data-row{grid-template-columns:1fr auto}.data-row>.date-chip{grid-column:1/2}.login-visual{display:none}.login-panel{min-height:100vh;padding:16px}.login-card{border:0;box-shadow:none}.topbar-actions .secure-badge{display:none}}

/* Registration, fixed learning-plan layout and shared classroom */
.auth-panel{width:min(470px,100%)}
.auth-mode-copy{margin-bottom:10px;padding:12px 14px;border-radius:12px;color:var(--green-dark);background:var(--green-soft)}
.auth-mode-copy strong,.auth-mode-copy span{display:block}.auth-mode-copy span{margin-top:3px;color:#53665b;font-size:11px}
.auth-tabs{margin-bottom:12px;padding:4px;display:grid;grid-template-columns:repeat(3,1fr);gap:4px;border:1px solid var(--line);border-radius:13px;background:#eef2ee}
.auth-tabs button{min-height:38px;padding:6px;border:0;border-radius:9px;color:var(--muted);background:transparent;font-size:11px;font-weight:800}
.auth-tabs button.active{color:var(--green-dark);background:#fff;box-shadow:0 3px 12px rgba(31,54,40,.08)}
.auth-panel .login-card{width:100%}
.login-card .checkbox-field{display:flex;align-items:flex-start;gap:9px;font-weight:600}
.checkbox-field input{width:17px;height:17px;margin:1px 0 0;flex:0 0 auto}
.status.approved,.status.accepted,.status.live{color:var(--green-dark);background:var(--green-soft)}
.status.pending,.status.waiting{color:#765817;background:#fff2c9}
.status.rejected,.status.revoked,.status.expired{color:var(--red);background:var(--red-soft)}
.status.ended{color:#50626f;background:var(--blue-soft)}
.plan-layout{display:grid;grid-template-columns:1fr;gap:17px}
.plan-item{width:100%;grid-template-columns:minmax(0,1.7fr) minmax(0,.8fr) minmax(0,.7fr) 40px;overflow:hidden}
.plan-item label,.plan-item input,.plan-item select{min-width:0}
.plan-item-notes{grid-column:1/-2}
.icon-delete{width:40px;align-self:end}
.latest-invite{margin-top:15px;padding:13px;border-radius:12px;background:var(--green-soft)}
.latest-invite strong{display:block;margin-bottom:7px}
.latest-invite textarea{min-height:75px;font-size:11px}
.registration-requests .data-row{grid-template-columns:minmax(220px,1.5fr) auto auto}
.classroom-header{display:flex;align-items:center;justify-content:space-between;gap:18px}
.classroom-header #classroom-status{margin-top:7px}
.classroom-participants{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.classroom-participants>span{width:38px;height:38px;display:grid;place-items:center;border-radius:12px;color:var(--green-dark);background:var(--green-soft);font-size:10px;font-weight:900}
.classroom-participants small{color:var(--muted)}
.board-shell{overflow:hidden;border:1px solid var(--line);border-radius:18px;background:#fff;box-shadow:var(--shadow)}
.board-toolbar{padding:12px;display:flex;align-items:center;gap:8px;flex-wrap:wrap;border-bottom:1px solid var(--line);background:#fff}
.board-toolbar .active{color:#fff;background:var(--green)}
.board-toolbar .muted{margin-left:auto}
.board-zoom-controls{display:flex;align-items:center;gap:4px;padding-left:5px;border-left:1px solid var(--line)}
.board-zoom-controls button{min-width:34px;padding-inline:8px}
.board-viewport{max-height:calc(100vh - 260px);min-height:520px;overflow:auto;background:#e9ede9}
.board-viewport::-webkit-scrollbar{width:12px;height:12px}.board-viewport::-webkit-scrollbar-thumb{border:3px solid #e9ede9;border-radius:999px;background:#b6c0b8}
#board-canvas-size{position:relative;width:1200px;height:720px;transition:width .16s ease,height .16s ease}
#lesson-board{position:absolute;inset:0 auto auto 0;width:1200px;height:720px;overflow:hidden;touch-action:none;transform-origin:top left;background-color:#fafbf9;background-image:linear-gradient(#e7ece8 1px,transparent 1px),linear-gradient(90deg,#e7ece8 1px,transparent 1px);background-size:24px 24px}
#lesson-board.draw-mode{cursor:crosshair}
#board-strokes,.drawing-preview,#board-items-layer{position:absolute;inset:0;width:1200px;height:720px}
.drawing-preview,#board-strokes{pointer-events:none}
#board-strokes.eraser-mode{z-index:2;pointer-events:auto;cursor:crosshair}
.board-stroke-hit{fill:none;stroke:transparent;stroke-width:24;pointer-events:stroke}
.board-stroke-hit:hover{stroke:rgba(188,70,62,.16)}
.board-stroke,#drawing-preview{fill:none;stroke:#25342b;stroke-width:3.5;stroke-linecap:round;stroke-linejoin:round}
.board-stroke.blue{stroke:#426b8a}.board-stroke.green{stroke:#226a4b}.board-stroke.pink{stroke:#b64f71}#drawing-preview{stroke:#226a4b;stroke-dasharray:5 4}
#board-items-layer{pointer-events:none}
.board-item{position:absolute;z-index:3;display:flex;flex-direction:column;pointer-events:auto;border:1px solid rgba(45,60,50,.12);border-radius:8px;box-shadow:0 9px 24px rgba(30,50,38,.14);overflow:hidden;background:#fff}
.board-item.dragging{z-index:20;opacity:.94;box-shadow:0 20px 45px rgba(18,45,29,.28)}
.board-item.resizing{z-index:20;box-shadow:0 20px 45px rgba(18,45,29,.28)}
.board-item.yellow{background:#fff1a8}.board-item.green{background:#d9f0df}.board-item.blue{background:#dcebf7}.board-item.pink{background:#f7dce5}
.board-item header{height:32px;padding:6px 8px;display:flex;align-items:center;justify-content:space-between;cursor:grab;border-bottom:1px solid rgba(0,0,0,.08);font-size:10px;font-weight:850;text-transform:uppercase;letter-spacing:.05em}
.board-item header:active{cursor:grabbing}.board-item header button{width:24px;height:24px;border:0;border-radius:6px;color:var(--red);background:rgba(255,255,255,.5)}
.board-item textarea{height:100%;margin:0;padding:10px;resize:none;border:0;border-radius:0;background:transparent;box-shadow:none}
.board-item textarea:focus{box-shadow:inset 0 0 0 2px rgba(34,106,75,.22)}
.board-image-frame{min-height:0;flex:1;display:grid;place-items:center;padding:5px;background:#f1f4f1}.board-image-frame img{width:100%;height:100%;display:block;object-fit:contain;pointer-events:none;user-select:none}
.board-resize-handle{position:absolute;right:0;bottom:0;z-index:4;width:28px;height:28px;padding:0;border:0;border-radius:14px 0 7px 0;background:linear-gradient(135deg,transparent 42%,rgba(34,106,75,.84) 43%);cursor:nwse-resize;touch-action:none}.board-resize-handle::after{content:"";position:absolute;right:5px;bottom:5px;width:8px;height:8px;border-right:2px solid #fff;border-bottom:2px solid #fff}
.lesson-timer{min-width:150px;padding:10px 13px;border-radius:12px;background:var(--soft);text-align:center}.lesson-timer span,.lesson-timer strong{display:block}.lesson-timer span{color:var(--muted);font-size:10px}.lesson-timer strong{margin-top:2px;font-size:21px;font-variant-numeric:tabular-nums}.lesson-timer.live{color:var(--green-dark);background:var(--green-soft)}.lesson-timer.overtime{color:var(--red);background:var(--red-soft)}

.materials-layout{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(300px,.65fr);gap:17px;align-items:start}.material-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,340px),1fr));gap:12px}.material-card{min-width:0;width:100%;box-sizing:border-box;padding:15px;display:grid;grid-template-columns:48px minmax(0,1fr);gap:12px;border:1px solid var(--line);border-radius:14px;background:var(--soft)}.material-icon{width:46px;height:56px;display:grid;place-items:center;border-radius:8px;color:#fff;background:var(--red);font-size:10px;font-weight:900}.material-main{min-width:0}.material-card h3{margin:2px 0 4px;font-size:15px;overflow-wrap:anywhere}.material-card p{margin:0;color:var(--muted);font-size:10px;overflow-wrap:anywhere}.material-card footer{min-width:0;grid-column:1/-1;display:flex;flex-wrap:wrap;gap:7px;justify-content:flex-end}.material-upload{position:sticky;top:96px}.material-upload-progress{width:100%;height:12px;accent-color:var(--green)}
.material-assignees{min-width:0;grid-column:1/-1;padding-top:10px;border-top:1px solid var(--line)}.material-assignees>strong{display:block;margin-bottom:7px;font-size:11px}.assignment-chip{max-width:100%;margin:0 5px 5px 0;padding:5px 7px;display:inline-flex;align-items:center;gap:5px;border-radius:999px;color:var(--green-dark);background:var(--green-soft);font-size:10px}.assignment-chip button{flex:0 0 auto;width:18px;height:18px;padding:0;border:0;border-radius:50%;color:var(--red);background:#fff}.material-assign-form{min-width:0;width:100%;margin-top:8px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:6px}.material-assign-form select{min-width:0;width:100%;padding:7px 9px;font-size:11px}
.practice-score{color:var(--muted);font-size:10px}.practice-card footer{display:flex;align-items:center;justify-content:space-between;gap:10px}.practice-runner{max-width:840px;margin-inline:auto}.practice-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}.practice-fields label{padding:11px;border:1px solid var(--line);border-radius:11px;background:var(--soft)}.practice-fields label span{display:block;font-weight:750}.answer-correct{border-color:#56a475!important;background:#edf8f1!important}.answer-wrong{border-color:#c96d66!important;background:#fff0ef!important}

/* Visual teacher calendar */
.teacher-calendar-card{padding:0;overflow:hidden}
.calendar-titlebar{padding:16px 18px;display:flex;align-items:center;gap:9px;border-bottom:1px solid var(--line)}
.calendar-titlebar h2{margin:0 auto 0 4px;font-size:22px;text-transform:capitalize}
.calendar-weekdays,.teacher-calendar-grid{display:grid;grid-template-columns:repeat(7,minmax(0,1fr))}
.calendar-weekdays{padding:8px 0;color:var(--muted);background:var(--soft);border-bottom:1px solid var(--line);font-size:11px;font-weight:800;text-align:center}
.calendar-day{min-height:122px;padding:7px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff}
.calendar-day:nth-child(7n){border-right:0}.calendar-day.outside{background:#fafbfa}.calendar-day.outside .calendar-day-number{color:#aab2ad}.calendar-day.today{background:#f3f8f4;box-shadow:inset 0 0 0 2px var(--green)}
.calendar-day-number{width:28px;height:28px;display:grid;place-items:center;border:0;border-radius:9px;color:var(--ink);background:transparent;font-weight:850}
.calendar-day-number:hover{color:#fff;background:var(--green)}
.calendar-events{margin-top:4px;display:flex;flex-direction:column;gap:4px}
.calendar-event{min-width:0;padding:5px 6px;display:flex;align-items:center;gap:5px;border:0;border-radius:7px;font-size:10px;text-align:left;overflow:hidden}
button.calendar-event{cursor:pointer}.calendar-event strong{flex:0 0 auto}.calendar-event span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.calendar-event.lesson{color:#174b36;background:#dfeee5}.calendar-event.requested{color:#765817;background:#fff2c9}.calendar-event.completed{color:#50626f;background:var(--blue-soft)}.calendar-event.slot{color:#37596e;background:#edf4f8}
.calendar-event.slot.selected{color:#fff;background:var(--green);box-shadow:0 0 0 2px rgba(34,106,75,.22)}.student-calendar-day .calendar-day-number:hover{color:var(--ink);background:transparent}
.calendar-legend{padding:11px 18px;display:flex;gap:18px;flex-wrap:wrap;color:var(--muted);font-size:11px}.calendar-legend span{display:flex;align-items:center;gap:6px}.legend-dot{width:9px;height:9px;border-radius:50%;background:#dfeee5}.legend-dot.requested{background:#f6dda0}.legend-dot.open{background:#bdd5e4}
.calendar-empty-note{margin:8px 0 0;padding:10px 14px;border-radius:10px;color:var(--muted);background:var(--soft);font-size:11px}

.modal-backdrop{position:fixed;inset:0;z-index:120;padding:20px;display:grid;place-items:center;background:rgba(15,27,19,.55);backdrop-filter:blur(3px)}
.modal-card{width:min(560px,100%);padding:22px;border-radius:18px;background:#fff;box-shadow:0 24px 80px rgba(0,0,0,.25)}
.modal-card .card-head h2{margin-top:4px}.modal-card #close-lesson-editor{font-size:24px;line-height:1}

.admin-login-page{min-height:100vh;display:grid;place-items:center;padding:24px;background:radial-gradient(circle at top right,#e4f1e9,transparent 40%),var(--bg)}
.admin-login-shell{width:min(460px,100%)}.admin-login-shell .login-card{width:100%}
.email-policy-hint{display:block;margin-top:6px;color:var(--muted);font-size:11px;line-height:1.4}
.status.assigned{color:#50626f;background:var(--blue-soft)}.status.submitted{color:#765817;background:#fff2c9}.status.reviewed{color:var(--green-dark);background:var(--green-soft)}
.homework-layout{display:grid;grid-template-columns:minmax(300px,.7fr) minmax(0,1.4fr);gap:17px;align-items:start}.homework-create{position:sticky;top:96px}.homework-list,.homework-student-list{display:flex;flex-direction:column;gap:13px}.homework-card h2,.homework-card h3{margin:5px 0 0}.homework-card>p{white-space:pre-wrap}.homework-meta{margin:12px 0;display:flex;gap:8px;flex-wrap:wrap;color:var(--muted);font-size:10px}.homework-meta span{padding:5px 8px;border-radius:999px;background:var(--soft)}.homework-response,.homework-feedback,.homework-waiting{margin-top:13px;padding:14px;border-radius:12px;background:var(--soft)}.homework-response p,.homework-feedback p{white-space:pre-wrap}.homework-response small{color:var(--muted)}.homework-feedback{color:var(--green-dark);background:var(--green-soft)}.homework-waiting{color:var(--muted);text-align:center}.homework-review-form{margin-top:12px;padding:13px;border:1px solid var(--line);border-radius:12px}.homework-review-form label:last-of-type{max-width:190px}.homework-card>footer{margin-top:12px;display:flex;justify-content:flex-end}.homework-drawing-head{margin:12px 0 7px;display:flex;align-items:center;justify-content:space-between;gap:10px}.homework-pad{width:100%;height:auto;display:block;border:1px solid var(--line);border-radius:12px;touch-action:none;background-color:#fff;background-image:linear-gradient(#edf0ed 1px,transparent 1px),linear-gradient(90deg,#edf0ed 1px,transparent 1px);background-size:20px 20px}.homework-pad:not(.readonly){cursor:crosshair}.homework-stroke{fill:none;stroke:#25342b;stroke-width:3.5;stroke-linecap:round;stroke-linejoin:round}.homework-preview{stroke:#226a4b;stroke-dasharray:5 4}
@media(max-width:900px){.materials-layout{grid-template-columns:1fr}.material-upload{position:static}}
@media(max-width:900px){.homework-layout{grid-template-columns:1fr}.homework-create{position:static}}
@media(max-width:700px){.plan-item{grid-template-columns:1fr 1fr}.plan-item>label:first-child,.plan-item-notes{grid-column:1/-1}.icon-delete{grid-column:2;justify-self:end}.classroom-header{align-items:flex-start;flex-direction:column}.board-toolbar .muted{width:100%;margin-left:0}.registration-requests .data-row{grid-template-columns:1fr auto}.registration-requests .button-row{grid-column:1/-1}.calendar-day{min-height:90px;padding:4px}.calendar-event span{display:none}.calendar-event{justify-content:center}.calendar-titlebar h2{font-size:17px}.calendar-titlebar{padding:12px}.calendar-weekdays{font-size:9px}.material-grid,.practice-fields{grid-template-columns:1fr}.material-assign-form{grid-template-columns:1fr}.material-assign-form .secondary-button{width:100%}}
@media(max-width:580px){.auth-tabs{grid-template-columns:1fr}.auth-panel .login-card{padding:24px 20px}.board-viewport{min-height:430px}.teacher-calendar-card{margin-inline:-8px}.calendar-day{min-height:67px}.calendar-day-number{width:25px;height:25px}.calendar-event{padding:3px;font-size:8px}.calendar-titlebar #calendar-today{display:none}.calendar-titlebar h2{font-size:15px}.modal-backdrop{padding:10px}}

/* Larger reusable classroom board and in-lesson assignment workspace */
.lesson-start-notice{margin-bottom:17px;padding:18px 20px;display:flex;align-items:center;justify-content:space-between;gap:18px;border:1px solid #e4c96e;border-radius:16px;background:#fff4c9;box-shadow:0 10px 30px rgba(83,68,18,.08)}
.lesson-start-notice.live{color:#fff;border-color:var(--green);background:linear-gradient(120deg,#194734,#2b7755)}
.lesson-start-notice h2,.lesson-start-notice p{margin:3px 0}.lesson-start-notice p{font-size:12px}.lesson-start-notice.live .eyebrow,.lesson-start-notice.live p{color:#d8e8df}.lesson-start-notice.live .primary-button{color:var(--green-dark);background:var(--lime)}
.board-viewport{height:max(680px,calc(100vh - 220px));max-height:none;min-height:680px}
#board-canvas-size{width:2000px;height:1200px}
#lesson-board{width:2000px;height:1200px}
#lesson-board.draw-mode{cursor:crosshair}#lesson-board.erase-mode{cursor:none}
#board-strokes,.drawing-preview,#board-items-layer{width:2000px;height:1200px}
#board-strokes{z-index:5;pointer-events:none}.drawing-preview{z-index:6;pointer-events:none}
#lesson-board.draw-mode .drawing-preview,#lesson-board.erase-mode .drawing-preview{z-index:50;pointer-events:all;touch-action:none}
#lesson-board.draw-mode .board-item,#lesson-board.erase-mode .board-item{pointer-events:none}
#eraser-preview{fill:rgba(255,255,255,.72);stroke:#b64f49;stroke-width:2;pointer-events:none}
.classroom-workspace{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}.classroom-workspace .classroom-homework-card{grid-column:1/-1}
.inline-classroom-form{display:flex;align-items:flex-end;gap:10px}.inline-classroom-form label{min-width:0;flex:1;color:#415048;font-size:12px;font-weight:750}
.teacher-classroom-actions{display:flex;align-items:center;justify-content:flex-end;gap:8px;flex-wrap:wrap}
#classroom-homework-card:focus-within{box-shadow:0 0 0 3px rgba(34,106,75,.16),var(--shadow)}
@media(max-width:700px){.classroom-workspace{grid-template-columns:1fr}.classroom-workspace .classroom-homework-card{grid-column:auto}.lesson-start-notice{align-items:flex-start;flex-direction:column}.inline-classroom-form{align-items:stretch;flex-direction:column}}
@media(max-width:580px){.board-viewport{height:600px;min-height:600px}}