/* Canonical owner: theme/assets/design-system/messenger.css. */
.dttt-messenger-head{align-items:flex-start;border-bottom:1px solid #e6eef2;display:flex;gap:14px;justify-content:space-between;margin-bottom:16px;padding:2px 2px 14px}
.dttt-messenger-head h1{color:#173f59;font-size:24px;line-height:1.18;margin:4px 0}
.dttt-messenger-head p:not(.dttt-student-kicker){color:#66818d;font-size:12px;margin:0}
.dttt-messenger-count{color:#28728e;font-size:12px;font-weight:800;white-space:nowrap}
.dttt-messenger-sidebar,.dttt-messenger-conversation{background:#f7fbfc;border:1px solid #e0ebef;border-radius:14px;min-width:0}
.dttt-messenger-sidebar-head{align-items:center;display:flex;justify-content:space-between;padding:4px 4px 10px}
.dttt-messenger-sidebar-head strong{color:#173f59;font-size:14px}
.dttt-messenger-sidebar-head span{color:#718995;font-size:11px}
.dttt-messenger-thread{align-items:center;border:1px solid transparent;border-radius:11px;box-sizing:border-box;color:inherit;display:flex;gap:9px;margin:4px 0;min-height:44px;padding:9px;text-decoration:none}
.dttt-messenger-thread:hover,.dttt-messenger-thread.is-active{background:#eaf5fa;border-color:#b9dce8}
.dttt-messenger-thread.is-unread{border-left:3px solid #0876b6}
.dttt-messenger-avatar{align-items:center;background:#d9eef5;border-radius:50%;color:#0876b6;display:flex;flex:0 0 34px;font-size:13px;font-weight:900;height:34px;justify-content:center;width:34px}
.dttt-messenger-thread-copy{display:grid;gap:3px;min-width:0}
.dttt-messenger-thread-copy strong{color:#173f59;font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dttt-messenger-thread-copy small{color:#718995;font-size:10px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dttt-messenger-unread{background:#0876b6;border-radius:999px;color:#fff;font-size:10px;min-width:20px;padding:3px 6px;text-align:center}
.dttt-messenger-create h2{color:#173f59;font-size:13px;margin:0 0 8px}
.dttt-messenger-create label,.dttt-messenger-group-form label{color:#45687a;display:grid;font-size:11px;font-weight:800;gap:5px;margin:8px 0}
.dttt-messenger-create select,.dttt-messenger-create input,.dttt-messenger-create textarea,.dttt-messenger-group-form select,.dttt-messenger-group-form input,.dttt-messenger-group-form textarea,.dttt-messenger-reply textarea{background:#fff;border:1px solid #c8dbe4;border-radius:9px;box-sizing:border-box;color:#244b62;font:inherit;font-size:12px;line-height:1.4;min-height:44px;padding:8px;width:100%}
.dttt-messenger-create textarea,.dttt-messenger-group-form textarea,.dttt-messenger-reply textarea{resize:vertical}
.dttt-messenger-create .dttt-button,.dttt-messenger-group-form .dttt-button,.dttt-messenger-reply .dttt-button{align-items:center;background:#0876b6;border:0;border-radius:9px;color:#fff;cursor:pointer;display:inline-flex;font-weight:850;justify-content:center;min-height:44px;padding:0 14px;width:100%}
.dttt-messenger-group-form{border-top:1px solid #dfeaed;margin-top:12px;padding-top:10px}
.dttt-messenger-group-form summary{align-items:center;color:#28728e;cursor:pointer;display:flex;font-size:11px;font-weight:800;min-height:44px;padding:0 4px}
.dttt-messenger-group-form select{min-height:96px}
.dttt-messenger-empty{color:#718995;font-size:11px;line-height:1.5;margin:10px 4px}
.dttt-messenger-conversation-head{background:#fff;border-bottom:1px solid #e0ebef;border-radius:14px 14px 0 0;padding:13px 16px}
.dttt-messenger-conversation-head div{display:grid;gap:3px}
.dttt-messenger-conversation-head strong{color:#173f59;font-size:15px}
.dttt-messenger-conversation-head small{color:#718995;font-size:11px}
.dttt-messenger-post{border:1px solid #dfeaed;border-radius:12px;max-width:78%;padding:9px 11px}
.dttt-messenger-post.is-mine{background:#eaf5fa;border-color:#b9dce8;margin-left:auto}
.dttt-messenger-post.is-incoming{background:#fff;margin-right:auto}
.dttt-messenger-post strong{color:#173f59;font-size:11px}
.dttt-messenger-post p{color:#355e71;font-size:12px;line-height:1.5;margin:4px 0;overflow-wrap:anywhere}
.dttt-messenger-post time{color:#7d9098;display:block;font-size:10px}
.dttt-messenger-reply{align-items:end;background:#fff;border-top:1px solid #e0ebef;border-radius:0 0 14px 14px;display:grid;gap:8px;grid-template-columns:minmax(0,1fr) auto;padding:12px}
.dttt-messenger-reply .dttt-button{width:74px}
.dttt-messenger-placeholder{align-content:center;background:#fff;border-radius:14px;display:grid;gap:5px;justify-items:center;min-height:620px;padding:20px;text-align:center}
.dttt-messenger-placeholder strong{color:#173f59;font-size:15px}
.dttt-messenger-placeholder span{color:#718995;font-size:12px}
.dttt-messenger-create[hidden]{display:none}
.dttt-messenger-create{border-top:1px solid #dfeaed;margin-top:10px;background:#f7fbfd;border:1px solid #dceaf0;border-radius:13px;margin:8px 0;padding:11px}
.dttt-messenger-create form{display:grid;gap:8px}
.dttt-messenger-create label{color:#527181;display:grid;font-size:10px;font-weight:850;gap:4px}
.dttt-messenger-create input,.dttt-messenger-create textarea{background:#fff;border:1px solid #c8dce6;border-radius:8px;box-sizing:border-box;font:inherit;min-height:44px;padding:7px 8px;width:100%}
.dttt-messenger-recipient-list{background:#fff;border:1px solid #dceaf0;border-radius:9px;display:grid;gap:2px;max-height:180px;overflow:auto;padding:5px}
.dttt-messenger-recipient{align-items:center;display:flex;gap:7px;min-height:44px;padding:6px 5px}
.dttt-messenger-recipient input{min-height:0;width:auto}
.dttt-messenger-recipient[hidden]{display:none}
.dttt-messenger-compose-help{color:#718899;font-size:10px;line-height:1.35}
.dttt-messenger input:not([type=checkbox]),.dttt-messenger textarea{font-size:16px;line-height:1.4}
.dttt-messenger-create input:not([type=checkbox]),.dttt-messenger-create textarea,.dttt-messenger-reply input:not([type=checkbox]),.dttt-messenger-reply textarea{font-size:16px;line-height:1.4}
.dttt-messenger-create[role="dialog"]{box-sizing:border-box;position:relative;min-width:0;max-width:100%;padding:12px;border:1px solid #d6e5eb;border-radius:14px;background:#f8fbfd;box-shadow:0 8px 22px rgba(18,48,78,.08)}
.dttt-messenger-compose-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px;color:#173e57;font-size:14px}
.dttt-messenger-compose-close{min-height:44px;padding:0 10px;border:1px solid #b9d2df;border-radius:8px;background:#fff;color:#24556d;cursor:pointer;font:700 12px inherit}
.dttt-messenger-compose-close:focus-visible{outline:3px solid rgba(8,118,182,.3);outline-offset:2px}
.dttt-messenger-new-trigger {
  margin:10px 0;
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  background: #0876b6;
  border: 0;
  border-radius: 9px;
  color: #fff;
  font-weight: 850;
}
.dttt-messenger-status {
  color: #28728e;
  font-size: 11px;
  line-height: 1.35;
  margin: 8px 0 0;
}
.dttt-messenger-status.is-error { color: #b52d3b; }
@media (max-width: 740px) {
.dttt-messenger-panel{border-radius:14px;margin-bottom:24px;padding:12px}
.dttt-messenger-head{display:block}
.dttt-messenger-count{display:block;margin-top:6px}
.dttt-messenger-shell{grid-template-columns:1fr}
.dttt-messenger-sidebar{order:1}
.dttt-messenger-post{max-width:90%}
.dttt-messenger-placeholder{min-height:220px}
.dttt-messenger-reply{grid-template-columns:minmax(0,1fr)}
.dttt-messenger-reply .dttt-button{width:100%}
.dttt-messenger-conversation {min-height:480px;order:2;
    height: auto;
    max-height: none;
    min-height: 0;
  }
.dttt-messenger-posts {min-height:280px;padding:11px;
    max-height: 520px;
    min-height: 220px;
  }
}
html body .dttt-messenger-create input[type="search"][data-dttt-recipient-search],
html body .dttt-messenger-create input[data-dttt-recipient-search] {
  width: 100%;
  box-sizing: border-box;
  font-size: 16px;
  line-height: 1.4;
  min-height: 44px;
}
.dttt-messenger-panel{padding:18px;box-sizing:border-box;width:100%;max-width:100%;margin:0 0 24px;overflow:visible;border:1px solid #d8e5ec;border-radius:18px;background:#fff;box-shadow:0 10px 28px rgba(13,50,82,.08)}
.dttt-messenger-shell{display:grid;grid-template-columns:minmax(250px,320px) minmax(0,1fr);gap:0;min-width:0}
.dttt-messenger-sidebar{padding:10px;min-width:0;max-height:680px;overflow-y:auto;border:0;border-right:1px solid #e0ebef;border-radius:0;background:#f7fbfc}
.dttt-messenger-conversation{display:grid;grid-template-rows:auto minmax(240px,1fr) auto;
  height: min(720px, calc(100vh - 260px));
  max-height: 720px;min-width:0;min-height:620px;border:0;border-radius:0;background:#fff}
.dttt-messenger-posts{background:#fff;display:grid;gap:8px;overflow:auto;padding:16px;
  align-content: start;
  grid-auto-rows: max-content;
  min-height: 0;
  overflow-y: auto;scroll-behavior:smooth}
.dttt-messenger-reply textarea,.dttt-messenger-create :where(input,select,textarea){font-size:16px}
.dttt-messenger-reply button[disabled]{cursor:wait;opacity:.6}
.dttt-messenger-create:not([hidden]){position:fixed;inset:50% auto auto 50%;z-index:13010;width:min(520px,calc(100vw - 24px));max-height:min(82vh,720px);margin:0;padding:16px;overflow:auto;transform:translate(-50%,-50%);border:1px solid #d5e4ea;border-radius:16px;background:#fff;box-shadow:0 24px 70px rgba(8,35,58,.28)}
.dttt-messenger-panel:has(.dttt-messenger-create:not([hidden]))::before{position:fixed;inset:0;z-index:13000;background:rgba(4,24,39,.38);content:""}
@media(max-width:767px) {
html body .dttt-messenger-create input[data-dttt-recipient-search] {
    font-size: 16px;
  }
.dttt-messenger-create[role="dialog"]{margin-top:8px;padding:11px;border-radius:12px}
.dttt-messenger-compose-head{font-size:13px}
.dttt-messenger-compose-close{min-height:40px}
.dttt-messenger-create[role="dialog"] input,.dttt-messenger-create[role="dialog"] textarea{font-size:16px}
.dttt-messenger-panel{width:100%;max-width:100%;margin:0 0 24px;border-radius:15px;overflow:hidden}
.dttt-messenger-head{padding:14px}
.dttt-messenger-shell{display:block}
.dttt-messenger-sidebar{max-height:240px;border-right:0;border-bottom:1px solid #e0ebef}
.dttt-messenger-conversation{min-height:430px}
.dttt-messenger-posts{min-height:260px;max-height:48vh}
.dttt-messenger-reply{position:sticky;bottom:0;grid-template-columns:minmax(0,1fr) 68px;padding:9px}
.dttt-messenger-reply textarea{min-height:44px;max-height:112px;padding:10px}
.dttt-messenger-create:not([hidden]){width:calc(100vw - 20px);max-height:calc(100dvh - 24px);padding:14px}
}
.dttt-message-panel{background:#fff;border:1px solid #d8e5ec;border-radius:14px;box-shadow:0 5px 16px rgba(21,61,83,.045);margin:0 0 18px;max-width:100%;width:100%;padding:18px 20px}
.dttt-message-panel header{border-bottom:1px solid #e4edf1;margin-bottom:14px;padding-bottom:12px}
.dttt-message-panel header h2{color:#173f59;font-size:22px;line-height:1.2;margin:4px 0}
.dttt-message-panel header p{color:#66828f;font-size:12px;margin:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dttt-message-course-list{display:grid;gap:8px;margin-top:12px}
.dttt-message-course-link{background:#f7fbfd;border:1px solid #dce9ee;border-radius:11px;color:inherit;display:flex;gap:10px;justify-content:space-between;padding:12px 14px;text-decoration:none}
.dttt-message-course-link strong{color:#173f59;font-size:14px;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dttt-message-course-link span{color:#65818e;font-size:11px;max-width:52%;overflow:hidden;text-align:right;text-overflow:ellipsis;white-space:nowrap}
.dttt-message-channels{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0 0}
.dttt-message-channels a{align-items:center;background:#f8fbfc;border:1px solid #cfe0e8;border-radius:999px;box-sizing:border-box;color:#426476;display:inline-flex;font-size:11px;font-weight:800;justify-content:center;min-height:44px;padding:0 10px;text-decoration:none}
.dttt-message-channels a.is-active{background:#e5f3fa;border-color:#1680b4;color:#0c658d}
.dttt-task-filters,.dttt-message-filters{display:flex;flex-wrap:wrap;gap:7px;margin:12px 0 16px}
.dttt-task-filters a,.dttt-message-filters a{align-items:center;background:#f7fafb;border:1px solid #cbdde5;border-radius:999px;box-sizing:border-box;color:#416575;display:inline-flex;font-size:12px;font-weight:800;justify-content:center;min-height:44px;padding:0 12px;text-decoration:none}
.dttt-task-filters a.is-active,.dttt-message-filters a.is-active{background:#0876b6;border-color:#0876b6;color:#fff}
.dttt-global-message-list{display:grid;gap:8px}
.dttt-global-message-card{padding:13px 15px}
.dttt-global-message-head{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:8px}
.dttt-global-message-head strong{color:#173f59}
.dttt-global-message-head span{color:#5e7d8b;font-size:11px}
.dttt-global-message-head time{color:#7d9098;font-size:10px;white-space:nowrap}
.dttt-global-message-card h3{font-size:14px;margin:8px 0 4px}
.dttt-global-message-card p{font-size:12px;margin:0}
.dttt-course-message-compose label:nth-last-of-type(2),.dttt-course-message-compose label:nth-last-of-type(1),.dttt-course-message-compose .dttt-message-recipient,.dttt-course-message-compose button{grid-column:1/-1}
.dttt-course-message-compose .dttt-message-recipient{color:#5c7a89;font-size:12px;margin:0}
@media(max-width:680px) {
.dttt-message-panel{border-radius:12px;padding:14px 12px}
.dttt-message-panel header h2{font-size:19px}
.dttt-message-course-link{display:block}
.dttt-message-course-link strong,.dttt-message-course-link span{display:block;max-width:100%;text-align:left}
.dttt-message-course-link span{margin-top:4px;white-space:normal}
.dttt-message-channels{gap:5px}
.dttt-message-channels a{font-size:10px;padding:6px 8px}
.dttt-global-message-head{grid-template-columns:1fr auto}
.dttt-global-message-head span{grid-column:1/-1;grid-row:2}
.dttt-course-message-compose .dttt-message-recipient,.dttt-course-message-compose button{grid-column:1/-1;width:100%}
}
.dttt-course-portal>.dttt-course-context,.dttt-course-portal>.dttt-course-tabs,.dttt-course-portal>.dttt-course-overview-grid,.dttt-course-portal>.dttt-course-tab-panel,.dttt-course-portal>.dttt-message-panel{grid-column:1/-1;min-width:0;width:100%}

/* Messenger v2: the thread remains primary; conversations are the right-side toolbar. */
@media(min-width:741px) {
.dttt-messenger-panel .dttt-messenger-shell{grid-template-columns:minmax(0,1fr) minmax(260px,320px);align-items:stretch}
.dttt-messenger-panel .dttt-messenger-conversation{grid-column:1;grid-row:1;min-width:0;border-radius:14px 0 0 14px}
.dttt-messenger-panel .dttt-messenger-toolbar{grid-column:2;grid-row:1;align-self:start;max-height:min(680px,calc(100vh - 260px));overflow-y:auto;border-right:0;border-left:1px solid #e0ebef;border-radius:0 14px 14px 0;position:sticky;top:calc(var(--dttt-header-height) + var(--dttt-space-4))}
}
@media(max-width:740px) {
.dttt-messenger-panel .dttt-messenger-shell{display:flex;flex-direction:column}
.dttt-messenger-panel .dttt-messenger-conversation{order:1;min-height:430px;border-radius:14px 14px 0 0}
.dttt-messenger-panel .dttt-messenger-toolbar{order:2;max-height:280px;border-right:0;border-top:1px solid #e0ebef;border-radius:0 0 14px 14px;position:static}
}
.dttt-messenger-toolbar .dttt-messenger-sidebar-head{position:sticky;top:-10px;z-index:2;background:#f7fbfc}
.dttt-messenger-thread--student .dttt-messenger-avatar{background:#eef6ff;color:#176493}.dttt-messenger-thread--teacher .dttt-messenger-avatar{background:#fff5e8;color:#a8671b}.dttt-messenger-thread--staff .dttt-messenger-avatar{background:#eef8f2;color:#24734a}
.dttt-messenger-post--student:not(.is-mine){border-color:#c9def3}.dttt-messenger-post--teacher:not(.is-mine){background:#fffaf3;border-color:#efd8b8}.dttt-messenger-post--student strong{color:#176493}.dttt-messenger-post--teacher strong{color:#a8671b}