:root{font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans",sans-serif;color:#263a36;background:#f3f6f4;font-size:14px}*{box-sizing:border-box}body{margin:0}header{height:72px;background:#fff;border-bottom:1px solid #dce5df;display:flex;align-items:center;gap:24px;padding:0 28px}header strong{font-size:28px;color:#26775d;letter-spacing:-1px}small{font-size:13px;font-weight:500;color:#556b63;letter-spacing:0}.badge{padding:7px 12px;background:#fff2cf;border-radius:6px;font-size:12px}header button{margin-left:auto}#status{padding:10px 28px;background:#e7f0eb;min-height:40px}button,input,textarea,select{font:inherit}button{cursor:pointer;border:1px solid #c8d8cf;border-radius:7px;background:white;color:#294c3d;padding:9px 13px}button:hover{background:#eaf2ed}button.primary{background:#26775d;color:#fff;border-color:#26775d}input,select,textarea{border:1px solid #ccd9d1;border-radius:7px;padding:10px;background:#fff}input:focus,textarea:focus{outline:2px solid #8ebba5}#login{max-width:560px;margin:50px auto;padding:32px;background:white;border:1px solid #dce5df;border-radius:14px}h1{font-size:25px}label{display:grid;gap:8px;margin:18px 0}details{margin-top:18px;border-top:1px solid #dce5df;padding-top:14px}summary{cursor:pointer;color:#416b58}.hint{font-size:12px;line-height:1.8;color:#6c7d73}main{display:grid;grid-template-columns:250px 1fr;height:calc(100vh - 112px)}[hidden]{display:none!important}aside{padding:22px 16px;background:#fff;border-right:1px solid #dce5df}.aside-title{font-size:12px;font-weight:bold;color:#718178;margin:0 10px 20px}nav button{display:block;text-align:left;width:100%;margin:7px 0;border-color:transparent;background:#f2f6f3;padding:15px}nav button.selected{background:#dceee3;color:#1a694c}.conversation{min-width:0;display:flex;flex-direction:column}.toolbar{display:flex;gap:12px;align-items:center;padding:16px 24px;background:#fff}.toolbar h2{font-size:17px;margin:0 auto 0 0}.toolbar input{width:260px}#items{overflow:auto;flex:1;padding:18px 24px;min-height:200px}.item{max-width:850px;background:white;border:1px solid #dce5df;border-radius:10px;margin:0 0 14px;padding:16px}.item p{white-space:pre-wrap;line-height:1.7}.item small{font-size:11px}.item button{font-size:12px;padding:6px 9px;margin:4px 5px 0 0}.item.important{border-left:4px solid #d4a33b}.item img,.item video{max-width:100%;max-height:300px;display:block;margin-top:10px}.item pre{white-space:pre-wrap}#composer{padding:16px 24px;background:#fff;border-top:1px solid #dce5df;max-height:50vh;overflow:auto}textarea{width:100%;height:70px;resize:vertical}.actions{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0}.actions input{flex:1}#pending{color:#8c5b17;font-size:12px}canvas{display:block;max-width:100%;border:1px solid #d4ded7;margin:12px 0}#lock{white-space:nowrap}@media(max-width:750px){header{padding:12px;height:auto;flex-wrap:wrap;gap:8px}header small{display:none}main{grid-template-columns:1fr;height:auto}aside{border-right:0;padding:12px}nav{display:flex;overflow:auto}nav button{min-width:150px;margin:0 6px 0 0}aside .hint{display:none}.toolbar{flex-wrap:wrap;padding:12px}.toolbar input{width:100%}#items{height:45vh;flex:auto}#login{margin:20px;padding:20px}#composer{max-height:none}}

/* Non-secret registration guide uses a reading layout, not chat columns. */
main.registration-guide{display:block;height:auto;max-width:760px;margin:24px auto;padding:0 20px 32px;line-height:1.8}
.registration-guide img{display:block;max-width:100%;height:auto}
/* Trial viewport constraints; no hidden overflow masking. */
main,aside,nav,.toolbar,.actions,#composer,#items,#login,dialog{min-width:0;max-width:100%}
input,select,textarea{min-width:0;max-width:100%}.actions input{flex:1 1 120px}
.item,header,#status,dialog{overflow-wrap:anywhere}dialog{width:440px;border:1px solid #c8d8cf;border-radius:12px}dialog::backdrop{background:#0005}
@media(max-width:750px){main{grid-template-columns:minmax(0,1fr)}header strong{font-size:23px}nav button{flex:0 0 150px}#composer,#items{padding:12px}#login{max-width:calc(100% - 24px);margin:12px}header button{margin-left:0}.actions>*{max-width:100%}}

#search-options{margin:0;padding:8px 24px;background:#fff}#search-options label{margin:0;font-size:12px}#search-options .hint{margin:4px 0}#file-editor-body{height:180px}#version-confirm{border-top:1px solid #c8d8cf;margin-top:12px}#version-confirm button{margin:4px}

#note-attachment-image{max-width:100%;height:auto}#note-attachment-text{height:140px}

#directory-list{display:flex;flex-direction:column;gap:6px;max-height:220px;overflow:auto}#directory-profile{border-top:1px solid #c8d8cf;margin-top:12px}

.item.unread-target{border-left:4px solid #26775d}
.toolbar{flex-wrap:wrap}

#group-people{max-height:240px;overflow:auto}#group-people label,#group-history-label{display:flex;align-items:center;gap:8px;margin:10px 0}

#notification-rooms label{display:flex;align-items:center;gap:.6rem;margin:.6rem 0}#notification-rooms input{width:auto;margin:0;flex:none}

#notification-panel{margin:8px 20px;padding:10px 16px;background:#edf6f1;border:1px solid #85ab99;border-radius:10px}#notification-items p{margin:.4rem 0}
/* Parent-thread shortcuts stay compact beside the conversation. */
#thread-links{display:flex;flex-wrap:wrap;gap:6px;padding:8px 16px;background:#f1f7f4}
#thread-links:empty{display:none}
#thread-links button{width:auto;margin:0;padding:7px 10px;border:1px solid #d5e5dc;background:white;font-size:.9rem}

/* R24 permanent, bounded thread list. */
aside{overflow:auto}.list-tabs{display:flex;gap:6px;margin-bottom:12px}.list-tabs button{flex:1}.list-tabs .selected{background:#dceee3;font-weight:bold}
#thread-panel label{margin:8px 0}#thread-count{font-size:12px}#thread-list{display:block;max-height:48vh;overflow:auto}#thread-list button{width:100%;overflow-wrap:anywhere}
@media(max-width:750px){#thread-list{max-height:28vh}#thread-list button{margin:4px 0;min-width:0}#thread-links{display:flex}#thread-links button{flex:0 1 auto;min-width:0}}

#reply-compose{border-left:3px solid #26775d;padding:8px;background:#edf6f1}blockquote[data-reply]{margin:8px 0;padding:8px 12px;border-left:3px solid #8ebba5;background:#f3f6f4;white-space:pre-wrap;font-size:13px;overflow-wrap:anywhere}