:root{
  --bg:#f4f7f1;--card:#fff;--line:#d9e3d5;--text:#21342a;--muted:#6b7d71;
  --main:#5f8e59;--main-dark:#466f42;--soft:#edf5e9;--danger:#c95f5f;--warn:#d99b3d;
}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Segoe UI,Arial,sans-serif;color:var(--text);background:var(--bg)}
button,input,select,textarea{font:inherit}button{cursor:pointer;border:0;border-radius:12px;padding:10px 14px;background:var(--main);color:#fff;font-weight:700}button:hover{filter:brightness(.97)}button:disabled{opacity:.5;cursor:not-allowed}
button.ghost,.file-button{background:var(--soft);color:var(--text);border:1px solid var(--line)}button.danger{background:var(--danger)}button.warn{background:var(--warn)}
input,select,textarea{width:100%;border:1px solid var(--line);border-radius:12px;padding:10px 12px;background:#fff;color:var(--text)}textarea{resize:vertical}label{display:grid;gap:5px;font-size:12px;color:var(--muted)}
h1,h2{margin:0}h1{font-size:22px}h2{font-size:18px}.muted{color:var(--muted)}.small-text{font-size:12px}.card{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:0 8px 26px rgba(24,45,30,.07)}
.app-shell{padding:12px;min-height:100vh;display:grid;gap:12px}.topbar{padding:14px;display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:center}.brand{display:flex;gap:10px;align-items:center}.brand-mark{width:44px;height:44px;border-radius:14px;background:var(--main);color:#fff;display:grid;place-items:center;font-weight:800}.connection-grid{display:grid;grid-template-columns:1fr 1fr .7fr auto auto;gap:8px;align-items:end}.status-row{grid-column:1/-1;display:flex;gap:18px;flex-wrap:wrap;font-size:13px;padding-top:2px}.main-layout{display:grid;grid-template-columns:310px minmax(0,1fr) 300px;gap:12px;min-height:calc(100vh - 132px)}.panel{padding:14px;overflow:auto}.left-column,.right-column{max-height:calc(100vh - 132px)}
.section-head,.workspace-top,.frame-head{display:flex;justify-content:space-between;align-items:center;gap:8px}.stack{display:grid;gap:10px}.stack.compact{gap:8px}.button-row{display:flex;gap:8px;flex-wrap:wrap}.small-btn{padding:8px 10px;font-size:12px}.badge{padding:5px 9px;border:1px solid var(--line);border-radius:999px;background:var(--soft);font-size:12px}.file-button{display:block;padding:10px 12px;border-radius:12px;text-align:center;font-size:13px;font-weight:700;cursor:pointer}.file-button.inline{display:inline-flex;align-items:center;width:auto}.inline-label{display:flex;align-items:center;gap:8px}.inline-label input{width:95px}
details{border:1px solid var(--line);border-radius:14px;margin-top:10px;background:#fbfdf9}summary{padding:11px 12px;font-weight:700;cursor:pointer}.details-body{padding:0 12px 12px}.notice{padding:10px;border-radius:12px;background:#fff7df;border:1px solid #ecd08b;font-size:13px}.material-list{display:grid;gap:8px}.material-item{padding:9px;border:1px solid var(--line);border-radius:12px;background:#fff}.material-item strong{display:block;font-size:13px;word-break:break-word}.material-actions{display:flex;gap:6px;flex-wrap:wrap;margin-top:7px}.material-actions button{padding:6px 8px;font-size:11px}.workspace{padding:12px;min-width:0;overflow:hidden}.workspace-top{padding-bottom:10px;border-bottom:1px solid var(--line);flex-wrap:wrap}.tabs{display:flex;gap:6px;flex-wrap:wrap}.tab{background:transparent;color:var(--muted);border:1px solid transparent}.tab.active{background:var(--soft);color:var(--main-dark);border-color:var(--line)}.view{display:none;height:calc(100% - 56px);padding-top:10px}.view.active{display:block}.timer-line{display:flex;align-items:center;justify-content:center;gap:7px;margin-bottom:8px}.timer-line strong{font-size:24px;min-width:78px;text-align:center}.timer-line input{width:58px;text-align:center;padding:7px}.board-toolbar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:8px;border:1px solid var(--line);border-radius:14px;background:#f8fbf6;margin-bottom:8px}.tool-group{display:flex;gap:5px}.tool{background:#fff;color:var(--text);border:1px solid var(--line);padding:8px 10px}.tool.active{background:var(--main);color:#fff}.colors{padding:3px}.color{width:28px;height:28px;border-radius:50%;padding:0;background:var(--c);border:3px solid #fff;box-shadow:0 0 0 1px var(--line)}.color.active{box-shadow:0 0 0 2px var(--main)}.board-wrap{height:calc(100vh - 330px);min-height:410px;position:relative;overflow:hidden;border:2px solid #e7ece4;border-radius:16px;background:#fff;touch-action:none}.board-wrap canvas,.object-layer{position:absolute;inset:0;width:100%;height:100%}.object-layer{pointer-events:none}.board-object{position:absolute;pointer-events:auto;user-select:none;touch-action:none;transform-origin:center;min-width:34px;min-height:34px}.board-object.selected{outline:3px solid #4f7ed8;outline-offset:3px}.board-object.locked{outline-style:dashed}.board-object img{width:100%;height:100%;object-fit:contain;display:block}.board-object.emoji{display:grid;place-items:center;font-size:54px;line-height:1}.board-object.note{background:#fef08a;border-radius:8px;padding:12px;box-shadow:4px 5px 12px rgba(0,0,0,.13);font-family:Comic Sans MS,cursive;white-space:pre-wrap;overflow:auto}.board-object.text{background:rgba(255,255,255,.8);border-radius:7px;padding:6px;white-space:pre-wrap;font-weight:600}.object-controls{display:flex;gap:7px;align-items:center;flex-wrap:wrap;margin-top:8px}.object-controls button{padding:7px 9px;font-size:12px}.emoji-palette{display:flex;gap:6px;flex-wrap:wrap;padding:8px;border:1px solid var(--line);border-radius:12px;background:#fff;margin-bottom:8px}.emoji-palette button{font-size:24px;background:#fff;border:1px solid var(--line);padding:5px}.hidden{display:none!important}.task-card{max-width:760px;margin:0 auto;padding:20px;display:grid;gap:14px}.answers-list{display:grid;gap:7px;margin-top:10px}.answer{padding:9px;border:1px solid var(--line);border-radius:11px;background:#fff}.content-frame{width:100%;height:calc(100vh - 220px);border:1px solid var(--line);border-radius:14px;background:#fff}.video-host{height:calc(100vh - 220px);display:grid;place-items:center;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#111}.video-host iframe,.video-host video{width:100%;height:100%;border:0;object-fit:contain}.screen-video{width:100%;height:calc(100vh - 220px);background:#111;border-radius:14px;object-fit:contain;display:none}.empty-state{display:grid;place-items:center;min-height:220px;color:var(--muted);padding:20px;text-align:center}.participants{display:grid;gap:8px;margin-top:10px}.participant{border:1px solid var(--line);border-radius:13px;padding:10px;background:#fbfdf9}.participant-head{display:flex;justify-content:space-between;gap:8px}.permission-grid{display:grid;grid-template-columns:1fr 1fr;gap:5px;margin-top:8px}.permission-grid label{display:flex;align-items:center;gap:5px;font-size:11px;color:var(--text)}.permission-grid input{width:auto}.events{display:grid;gap:6px}.event{font-size:12px;padding:8px;border:1px solid var(--line);border-radius:10px;background:#fff}.toast{position:fixed;right:16px;bottom:16px;max-width:360px;background:#20342a;color:#fff;padding:12px 15px;border-radius:12px;box-shadow:0 12px 30px rgba(0,0,0,.2);opacity:0;pointer-events:none;transform:translateY(10px);transition:.2s}.toast.show{opacity:1;transform:none}.teacher-only{display:none}
@media(max-width:1180px){.main-layout{grid-template-columns:270px minmax(0,1fr)}.right-column{grid-column:1/-1;max-height:none}.participants{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}.topbar{grid-template-columns:1fr}.connection-grid{grid-template-columns:1fr 1fr 1fr auto auto}}
@media(max-width:760px){.app-shell{padding:6px}.main-layout{grid-template-columns:1fr}.left-column,.right-column{max-height:none}.connection-grid{grid-template-columns:1fr 1fr}.connection-grid button{width:100%}.board-wrap{height:58vh;min-height:360px}.workspace-top{align-items:flex-start}.content-frame,.video-host,.screen-video{height:62vh}.topbar{padding:10px}.brand-mark{display:none}}

.preview-notice{position:sticky;top:0;z-index:10000;padding:12px 18px;background:#fff3cd;border-bottom:1px solid #e6c76b;color:#5f4912;text-align:center;font-size:14px}

/* v1.2: один учитель, приглашения и закрытие комнаты */
.room-actions{grid-column:1/-1;gap:8px;flex-wrap:wrap;padding-top:4px}.teacher-block{display:none}.student-mode .teacher-panel{display:none}.student-mode .main-layout{grid-template-columns:minmax(0,1fr) 300px}.participant-actions{display:flex;gap:6px;align-items:center;flex-wrap:wrap}.participant-actions button{padding:5px 8px;font-size:11px}.room-closed{color:#b42318}.room-open{color:#2b7a33}
@media(max-width:1180px){.student-mode .main-layout{grid-template-columns:minmax(0,1fr)}.student-mode .right-column{grid-column:1}}

.ghost-file{background:#f4f7f2;color:#29402f;border:1px solid #d7e4d1;display:inline-flex;align-items:center;justify-content:center;min-height:44px}
.export-progress{font-size:13px;color:#52665a;min-height:20px}

/* Сворачивание разделов */
details:not([open]) > .details-body{display:none!important;}


/* Выезжающая правая панель */
.right-column {
  min-width: 0;
  transition: transform .25s ease, opacity .2s ease;
}

.right-panel-toggle {
  position: fixed;
  top: 50%;
  right: 0;
  z-index: 1002;
  width: 36px;
  height: 68px;
  padding: 0;
  border-radius: 16px 0 0 16px;
  transform: translateY(-50%);
  font-size: 28px;
  line-height: 1;
  box-shadow: 0 5px 20px rgba(0,0,0,.18);
}

body.right-panel-hidden .main-layout {
  grid-template-columns: 310px minmax(0,1fr) 0;
}

body.student-mode.right-panel-hidden .main-layout {
  grid-template-columns: minmax(0,1fr) 0;
}

body.right-panel-hidden .right-column {
  transform: translateX(calc(100% + 30px));
  opacity: 0;
  pointer-events: none;
  overflow: hidden;
}

@media (max-width:1180px) {
  body.right-panel-hidden .main-layout,
  body.student-mode.right-panel-hidden .main-layout {
    grid-template-columns: minmax(0,1fr);
  }

  body.right-panel-hidden .right-column {
    display: none;
  }
}