/*
Theme Name: MathBoard Teacher
Theme URI: https://example.com/mathboard
Author: OpenAI
Description: Интерактивная онлайн-доска для учителей математики и других предметов.
Version: 1.5.0
Requires at least: 6.2
Requires PHP: 7.4
Text Domain: mathboard
*/
:root{--bg:#f4f6fa;--panel:#fff;--ink:#182230;--muted:#687387;--line:#dfe4ec;--blue:#3468ff;--blue2:#e9efff;--shadow:0 10px 35px rgba(25,40,70,.12);--radius:14px}
*{box-sizing:border-box}html,body{margin:0;height:100%;overflow:hidden;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}button,input,select{font:inherit}.mb-app{display:grid;grid-template-rows:58px 1fr 42px;height:100dvh}.mb-top{display:flex;align-items:center;gap:12px;padding:8px 14px;background:var(--panel);border-bottom:1px solid var(--line);z-index:10}.mb-brand{display:flex;align-items:center;gap:9px;font-weight:800;white-space:nowrap}.mb-logo{width:34px;height:34px;border-radius:10px;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:20px}.mb-title{min-width:130px;max-width:270px;border:0;background:transparent;font-weight:650;padding:8px;border-radius:8px}.mb-title:hover,.mb-title:focus{background:var(--bg);outline:none}.mb-spacer{flex:1}.mb-top-btn,.mb-icon-btn{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:9px;height:38px;padding:0 13px;display:inline-flex;align-items:center;gap:7px;cursor:pointer}.mb-top-btn:hover,.mb-icon-btn:hover{background:#f7f8fb}.mb-top-btn.primary{border-color:var(--blue);background:var(--blue);color:#fff}.mb-main{min-height:0;display:grid;grid-template-columns:74px 1fr}.mb-toolbar{background:var(--panel);border-right:1px solid var(--line);padding:10px 8px;display:flex;flex-direction:column;gap:5px;overflow-y:auto;z-index:8}.mb-tool{height:52px;border:0;background:transparent;border-radius:10px;color:var(--muted);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;cursor:pointer;font-size:10px}.mb-tool span:first-child{font-size:21px;line-height:1}.mb-tool:hover{background:var(--bg);color:var(--ink)}.mb-tool.active{background:var(--blue2);color:var(--blue)}.mb-sep{height:1px;background:var(--line);margin:3px}.mb-stage-wrap{position:relative;overflow:hidden;background:#e8ebf1}.mb-stage{position:absolute;inset:0;touch-action:none;cursor:crosshair}.mb-stage.grid{background-color:#fff;background-image:linear-gradient(#e7eaf0 1px,transparent 1px),linear-gradient(90deg,#e7eaf0 1px,transparent 1px);background-size:25px 25px}.mb-stage.dots{background-color:#fff;background-image:radial-gradient(#cfd5df 1.2px,transparent 1.2px);background-size:22px 22px}.mb-stage.blank{background:#fff}.mb-canvas{position:absolute;inset:0;width:100%;height:100%}.mb-floating{position:absolute;top:14px;left:50%;transform:translateX(-50%);display:flex;gap:6px;background:#fff;padding:6px;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);z-index:6}.mb-floating label{display:flex;align-items:center;gap:5px;color:var(--muted);font-size:12px}.mb-floating input[type=color]{width:30px;height:30px;padding:2px;border:1px solid var(--line);border-radius:7px;background:#fff}.mb-floating input[type=range]{width:90px}.mb-bottom{display:flex;align-items:center;gap:7px;padding:5px 12px;background:#fff;border-top:1px solid var(--line);z-index:10}.mb-pages{display:flex;align-items:center;gap:5px;overflow-x:auto}.mb-page{height:30px;min-width:34px;border:1px solid var(--line);background:#fff;border-radius:7px;cursor:pointer}.mb-page.active{color:#fff;background:var(--blue);border-color:var(--blue)}.mb-status{margin-left:auto;color:var(--muted);font-size:12px;white-space:nowrap}.mb-zoom{display:flex;align-items:center;gap:4px}.mb-zoom button{width:30px;height:30px;padding:0;border:1px solid var(--line);background:#fff;border-radius:7px;cursor:pointer}.mb-modal{position:fixed;inset:0;background:rgba(17,24,39,.42);display:none;align-items:center;justify-content:center;z-index:30;padding:20px}.mb-modal.open{display:flex}.mb-dialog{width:min(520px,100%);max-height:80vh;overflow:auto;background:#fff;border-radius:16px;box-shadow:var(--shadow);padding:22px}.mb-dialog h2{margin:0 0 14px}.mb-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.mb-card{border:1px solid var(--line);border-radius:12px;padding:14px;text-align:center;cursor:pointer;background:#fff}.mb-card:hover{border-color:var(--blue);background:var(--blue2)}.mb-card b{display:block;font-size:24px;margin-bottom:7px}.mb-formula-input{width:100%;border:1px solid var(--line);border-radius:10px;padding:12px;margin:7px 0}.mb-help{color:var(--muted);font-size:13px;line-height:1.5}.mb-toast{position:fixed;right:18px;bottom:58px;background:#172033;color:#fff;padding:11px 15px;border-radius:10px;box-shadow:var(--shadow);opacity:0;transform:translateY(10px);transition:.2s;z-index:50}.mb-toast.show{opacity:1;transform:none}.mb-mobile-more{display:none}@media(max-width:760px){.mb-app{grid-template-rows:54px 1fr 42px}.mb-main{grid-template-columns:1fr}.mb-toolbar{position:absolute;z-index:15;left:8px;top:62px;border:1px solid var(--line);border-radius:13px;box-shadow:var(--shadow);max-height:calc(100vh - 130px);transform:translateX(-110%);transition:.2s}.mb-toolbar.open{transform:none}.mb-mobile-more{display:inline-flex}.mb-brand strong{display:none}.mb-title{min-width:80px;width:30vw}.mb-top-btn .label{display:none}.mb-floating{top:8px}.mb-floating label:nth-child(3){display:none}}
.mb-presentation{display:none;position:absolute;left:50%;bottom:16px;transform:translateX(-50%);z-index:9;align-items:center;gap:7px;padding:7px;background:#172033;color:#fff;border-radius:12px;box-shadow:var(--shadow)}.mb-presentation.open{display:flex}.mb-presentation button{height:32px;border:0;border-radius:7px;background:#fff;color:#182230;padding:0 12px;cursor:pointer}.mb-presentation>button:first-child,.mb-presentation>button:nth-child(3){font-size:24px;width:36px;padding:0}.mb-presentation span{width:1px;height:24px;background:#475569}.mb-call{display:none;position:fixed;right:16px;top:74px;width:min(390px,calc(100vw - 32px));height:520px;background:#111827;border-radius:16px;overflow:hidden;z-index:40;box-shadow:0 24px 70px rgba(0,0,0,.4);resize:both;min-width:290px;min-height:240px}.mb-call.open{display:block}.mb-call.minimized{height:48px!important;resize:none}.mb-call.minimized #jitsi{display:none}.mb-call-head{height:48px;padding:0 10px;display:flex;align-items:center;gap:7px;color:#fff;background:linear-gradient(135deg,#182230,#26364d);cursor:move;user-select:none}.mb-call-head small{color:#aebbd0}.mb-live{width:9px;height:9px;border-radius:50%;background:#31c76a;box-shadow:0 0 0 4px rgba(49,199,106,.15)}.mb-call-head button{border:0;background:#ffffff18;color:#fff;width:30px;height:30px;border-radius:8px;font-size:20px;cursor:pointer}.mb-call-head #callMin{margin-left:auto}.mb-call #jitsi{height:calc(100% - 48px)}.mb-call iframe{width:100%;height:100%;border:0}.mb-stage{background-position:var(--grid-x,0px) var(--grid-y,0px)}
.mb-presentation{left:auto;bottom:auto;transform:none;right:22px;top:78px}.mb-context{display:none;position:fixed;z-index:60;min-width:190px;padding:7px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow)}.mb-context.open{display:grid;gap:4px}.mb-context strong{padding:7px 9px;font-size:12px;color:var(--muted)}.mb-context button{border:0;background:#fff;text-align:left;padding:9px;border-radius:7px;cursor:pointer}.mb-context button:hover{background:var(--blue2);color:var(--blue)}
.mb-draw-author{display:none;position:fixed;z-index:25;pointer-events:none;background:#3468ff;color:#fff;padding:4px 8px;border-radius:8px;font-size:12px;font-weight:700;box-shadow:0 4px 12px #3468ff44}.mb-draw-author.show{display:block}.mb-crop-wrap{position:relative;max-height:55vh;overflow:auto;background:#dfe4ec;border-radius:10px}.mb-crop-wrap canvas{display:block;max-width:100%;height:auto}.mb-crop-wrap #cropSelection{display:none;position:absolute;border:2px solid #3468ff;background:#3468ff18;pointer-events:none}.mb-presence-label{position:fixed;z-index:20;pointer-events:none;color:#fff;background:#3468ff;padding:3px 7px;border-radius:7px;font-size:11px}.mb-modal#nameModal{background:#eef2f8}.mb-modal#nameModal .mb-dialog{max-width:420px}.mb-context{min-width:205px}
.mb-math-dialog label{display:grid;gap:5px;font-size:13px;color:var(--muted)}.mb-math-fields{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:10px}.mb-math-fields label.full{grid-column:1/-1}.mb-math-preview{min-height:92px;margin-top:14px;border:1px dashed #b8c2d2;border-radius:12px;background:#f8faff;display:flex;align-items:center;justify-content:center;font-family:Cambria Math,"Times New Roman",serif;font-size:32px;color:#111827}.mb-preview-fraction{display:inline-grid;grid-template-rows:auto 2px auto;text-align:center;min-width:70px;gap:4px}.mb-preview-fraction i{height:2px;background:currentColor}.mb-context .mb-danger{color:#cf3344}.mb-context .mb-danger:hover{background:#fff0f1;color:#b82031}.mb-tool[data-tool="pointer"] span:first-child{transform:rotate(-25deg)}
@media print{.mb-top,.mb-toolbar,.mb-bottom,.mb-floating{display:none!important}.mb-app,.mb-main{display:block;height:100%}.mb-stage-wrap{position:fixed;inset:0;background:#fff}.mb-stage{inset:0}}