/* BrowserPair Chat (ADR 0015): a calm, full-height chat with a list, thread, and bottom composer. */
body.app-mode[data-page="chat"] .control-layout{width:100%;padding-top:0}
body.app-mode[data-page="chat"] #app{padding-bottom:0}
body.app-mode[data-page="chat"] .tab-panel.chat-page{padding:0}
.chat-layout{--chat-history:264px;display:grid;grid-template-columns:var(--chat-history) minmax(0,1fr);height:calc(100vh - var(--app-topbar-height));height:calc(100dvh - var(--app-topbar-height));min-height:480px}

/* Chat list */
.chat-history{display:flex;flex-direction:column;gap:8px;min-height:0;padding:16px 12px;border-right:1px solid var(--control-border);background:var(--surface)}
.chat-history-head{display:flex;align-items:center;gap:8px}
.chat-new-button{flex:1;min-height:40px;display:flex;align-items:center;gap:8px;padding:0 12px;border:1px solid var(--ink);border-radius:6px;background:var(--acid);color:var(--acid-ink);font:700 12.5px Geist,system-ui,sans-serif;cursor:pointer;box-shadow:1.5px 1.5px 0 var(--ink)}
.chat-new-button:hover,.chat-new-button:focus-visible{background:#d7ff78;outline:none}
.chat-new-icon{width:15px;height:15px;background:currentColor;-webkit-mask:url('/icons/plus.svg') center/contain no-repeat;mask:url('/icons/plus.svg') center/contain no-repeat}
.chat-history-close{display:none}
#tab-chat .chat-search input{width:100%;min-height:36px;margin:0;padding:0 10px 0 32px;border:1px solid var(--control-border);border-radius:6px;background:var(--control-soft) url('/icons/search.svg') 10px center/14px no-repeat;font-size:12.5px}
html[data-theme="dark"] #tab-chat .chat-search input{background-image:none;padding-left:10px}
.chat-list{flex:1;min-height:0;overflow-y:auto;margin:4px 0 0;padding:0;list-style:none;scrollbar-width:thin}
.chat-list ol{margin:0;padding:0;list-style:none}
.chat-list-group+.chat-list-group{margin-top:12px}
.chat-list-label{display:block;padding:4px 8px;color:var(--muted);font-size:10px;font-weight:800;letter-spacing:.06em;text-transform:uppercase}
.chat-list-item{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:0 8px;padding:8px;border-radius:6px;color:var(--text);text-decoration:none}
.chat-list-item:hover{background:var(--control-soft)}
.chat-list-item.active{background:var(--control-soft);box-shadow:inset 3px 0 0 var(--acid)}
.chat-list-item:focus-visible{outline:2px solid var(--focus);outline-offset:-2px}
.chat-list-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px;font-weight:500}
.chat-list-item small{grid-column:1;color:var(--muted);font-size:11px}
.chat-list-live{grid-row:1;grid-column:2;width:8px;height:8px;border-radius:50%;background:var(--acid);box-shadow:0 0 0 1px var(--ink);animation:chat-pulse 1.6s ease-in-out infinite}
.chat-list-empty{margin:8px;color:var(--muted);font-size:12px}

/* Main column */
.chat-main{display:grid;grid-template-columns:minmax(0,1fr);grid-template-rows:auto minmax(0,1fr) auto;min-width:0;min-height:0;background:var(--bg)}
.chat-header{grid-row:1}.chat-setup,.chat-scroll{grid-row:2}.chat-composer{grid-row:3}
.chat-header{display:flex;align-items:center;gap:12px;min-height:56px;padding:8px 20px;border-bottom:1px solid var(--control-border);background:var(--surface)}
.chat-history-toggle{display:none}
.chat-history-toggle>span{display:block;width:16px;height:16px;margin:auto;background:currentColor;-webkit-mask:url('/icons/history.svg') center/contain no-repeat;mask:url('/icons/history.svg') center/contain no-repeat}
.chat-title-wrap{flex:1;min-width:0;display:flex;align-items:center;gap:8px}
.chat-title-wrap h2{overflow:hidden;margin:0;text-overflow:ellipsis;white-space:nowrap;font-size:14px;font-weight:600;letter-spacing:-.01em}
.chat-title-wrap .chat-rename{opacity:0;transition:opacity .12s ease}
.chat-title-wrap:hover .chat-rename,.chat-title-wrap .chat-rename:focus-visible{opacity:1}
#tab-chat .chat-title-input{flex:1;width:auto;min-width:0;min-height:34px;margin:0;padding:0 10px;border:1px solid var(--ink);border-radius:6px;font-size:15px;font-weight:700}
.chat-page .text-button{min-height:28px;padding:0 4px;border:0;text-decoration:none;color:var(--muted);font-size:12px;font-weight:600}
.chat-page .text-button:hover,.chat-page .text-button:focus-visible{color:var(--text);text-decoration:underline}
.chat-context{display:flex;align-items:center;gap:8px}
.chat-chip{display:flex;align-items:center;gap:6px;min-height:34px;padding:0 4px 0 10px;border:1px solid var(--control-border);border-radius:999px;background:var(--surface)}
#tab-chat .chat-chip select{width:auto;max-width:180px;min-height:30px;height:30px;margin:0;padding:0 22px 0 4px;border:0;border-radius:999px;background:transparent url('/icons/chevron-down.svg') right 4px center/12px no-repeat;appearance:none;font-size:12px;font-weight:700;cursor:pointer}
/* Keep focus on the chip; global form styles otherwise draw a second inset ring. */
html body.app-mode #tab-chat .chat-chip select,
html body.app-mode #tab-chat .chat-chip select:is(:hover,:focus,:active){border:0!important;outline:0!important;box-shadow:none!important;transform:none!important;filter:none!important;background-color:transparent!important;transition:none;color:var(--text)}
#tab-chat .chat-chip select option{background:var(--surface);color:var(--text)}
.chat-model-label{padding-right:8px;font-size:12px;font-weight:700;white-space:nowrap}
.chat-chip select:disabled{cursor:default;opacity:1;color:var(--text)}
.chat-chip:hover{background:var(--control-soft)}
.chat-chip:focus-within{border-color:var(--muted);box-shadow:none}
.chat-chip:has(select:focus-visible){outline:2px solid var(--focus);outline-offset:3px}

.chat-options-button>span,.chat-archive-button>span{display:block;width:16px;height:16px;margin:auto;background:currentColor;-webkit-mask:var(--chat-icon) center/contain no-repeat;mask:var(--chat-icon) center/contain no-repeat}
.chat-options-button{--chat-icon:url('/icons/settings.svg')}.chat-archive-button{--chat-icon:url('/icons/archive.svg')}
.chat-header .icon-button{flex:none;width:36px;height:36px;padding:0;border:1px solid var(--control-border);border-radius:6px;background:var(--surface);cursor:pointer}
.chat-header .icon-button:hover{border-color:var(--ink)}

/* Setup and empty states */
.chat-setup,.chat-empty{display:grid;justify-items:center;align-content:center;gap:8px;max-width:520px;margin:0 auto;padding:48px 24px;text-align:center}
.chat-setup-icon{width:52px;height:52px;border-radius:12px;background:var(--acid);position:relative}
.chat-setup-icon::after{content:'';position:absolute;inset:14px;background:var(--acid-ink);-webkit-mask:url('/icons/agent_model.svg') center/contain no-repeat;mask:url('/icons/agent_model.svg') center/contain no-repeat}
.chat-setup h3,.chat-empty h3{margin:8px 0 0;font-size:22px;letter-spacing:-.03em}
.chat-setup p,.chat-empty p{margin:0;color:var(--muted);font-size:13.5px;line-height:1.55}
.chat-setup-actions{margin-top:8px}
.chat-setup-note{font-size:12.5px!important}

/* Thread */
.chat-scroll{min-height:0;overflow-y:auto;padding:24px 20px 8px;scroll-behavior:smooth}
.chat-thread{display:grid;grid-template-columns:minmax(0,1fr);gap:32px;max-width:720px;margin:0 auto;padding:0;list-style:none}
.chat-task>ol{display:grid;grid-template-columns:minmax(0,1fr);gap:12px;margin:0;padding:0;list-style:none}
.chat-msg{display:flex;gap:10px;align-items:flex-start;min-width:0}
.chat-msg-user{justify-content:flex-end}
.chat-bubble{max-width:min(600px,85%);overflow-wrap:anywhere;white-space:pre-wrap;font-size:15px;line-height:1.65}
.chat-msg-user .chat-bubble{padding:10px 16px;border-radius:18px;background:var(--control-soft)}
.chat-msg-bot .chat-bubble{max-width:100%;padding:0}
.chat-msg-bot .chat-bubble p{margin:0}
.chat-msg-question .chat-bubble{padding:10px 14px;border:1px solid var(--line-strong);border-left:3px solid var(--acid);border-radius:4px 12px 12px 12px;background:var(--surface)}
.chat-question-label{display:block;margin-bottom:4px;color:var(--muted);font-size:10.5px;font-weight:800;letter-spacing:.06em;text-transform:uppercase}
.chat-work summary{display:inline-flex;align-items:center;gap:8px;max-width:100%;cursor:pointer;list-style:none;color:var(--muted);font-size:13px;font-weight:500}
.chat-work summary::-webkit-details-marker{display:none}
.chat-work summary::after{content:'';width:10px;height:10px;flex:none;background:currentColor;-webkit-mask:url('/icons/chevron-down.svg') center/contain no-repeat;mask:url('/icons/chevron-down.svg') center/contain no-repeat;transition:transform .15s ease}
.chat-work details[open] summary::after{transform:rotate(180deg)}
.chat-work summary:hover{color:var(--text)}
.chat-work-label{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chat-work-mark{width:8px;height:8px;flex:none;border-radius:50%;background:var(--line-strong)}
.chat-work.live .chat-work-mark{background:var(--acid);box-shadow:0 0 0 1px var(--ink);animation:chat-pulse 1.4s ease-in-out infinite}
.chat-work.trouble .chat-work-mark{background:var(--warning)}
.chat-work ol{display:grid;gap:4px;margin:10px 0 0 3px;padding:0 0 0 14px;border-left:1px solid var(--control-border);list-style:none}
.chat-work-note{color:var(--muted);font-size:13px;line-height:1.5}
.chat-step{display:flex;align-items:baseline;gap:8px;font-size:12.5px;line-height:1.45}
.chat-step-mark{width:14px;flex:none;text-align:center;font-weight:800}
.chat-step.done .chat-step-mark{color:var(--success)}.chat-step.failed .chat-step-mark{color:var(--danger)}.chat-step.uncertain .chat-step-mark,.chat-step.waiting .chat-step-mark{color:var(--warning)}
.chat-step.running .chat-step-mark::before{content:'';display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--acid);box-shadow:0 0 0 1px var(--ink);animation:chat-pulse 1.4s ease-in-out infinite}
.chat-step-text{min-width:0;overflow-wrap:anywhere}
.chat-step small{color:var(--muted)}
.chat-decision{margin:0}
.chat-decision .attention-item{border:1px solid var(--line-strong);border-radius:8px;background:var(--surface)}
.chat-status{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;padding:8px 12px;border-radius:8px;background:var(--surface);border:1px solid var(--control-border);font-size:12.5px}
.chat-status-dot{width:8px;height:8px;border-radius:50%;background:var(--muted)}
.chat-status.success .chat-status-dot{background:var(--success)}.chat-status.warning .chat-status-dot{background:var(--warning)}.chat-status.waiting .chat-status-dot{background:var(--acid);box-shadow:0 0 0 1px var(--ink)}
.chat-status.live .chat-status-dot{background:var(--acid);box-shadow:0 0 0 1px var(--ink);animation:chat-pulse 1.4s ease-in-out infinite}
.chat-status-label{font-weight:700}
.chat-status.warning{border-color:color-mix(in srgb,var(--warning) 45%,transparent)}
.chat-status-detail{flex-basis:100%;color:var(--muted)}
.chat-status-meta{display:flex;align-items:center;gap:8px;margin-left:auto;color:var(--muted)}
.chat-meta{display:flex;align-items:center;gap:6px;color:var(--muted);font-size:12px}
.chat-meta-check{color:var(--success);font-weight:800}
.chat-meta time::before{content:'· '}
.chat-page .chat-meta .text-button{min-height:24px;font-size:12px}

/* Composer */
.chat-composer{padding:8px 20px 16px;background:linear-gradient(to bottom,transparent,var(--bg) 24%)}
.chat-composer>*{max-width:780px;margin-inline:auto}
.chat-notice{margin-bottom:8px;padding:8px 12px;border-radius:8px;border:1px solid var(--control-border);background:var(--surface);font-size:12.5px}
.chat-notice[data-tone="warning"]{border-color:color-mix(in srgb,var(--warning) 50%,transparent);color:var(--warning)}
.chat-input-box{border:1px solid var(--control-border-strong,var(--line-strong));border-radius:14px;background:var(--surface);box-shadow:0 6px 24px rgba(30,34,25,.06)}
.chat-input-box:focus-within{border-color:var(--ink)}
#tab-chat .chat-input-box textarea{display:block;width:100%;min-height:52px;max-height:220px;margin:0;padding:14px 16px 6px;border-radius:14px 14px 0 0;border:0;background:transparent;resize:none;font-size:14.5px;line-height:1.5;outline:none}
.chat-input-box textarea:disabled{cursor:not-allowed}
.chat-input-row{display:flex;align-items:flex-end;gap:8px;padding:6px 8px 8px 12px}
.chat-send-group{display:flex;align-items:center;gap:8px;margin-left:auto}
.chat-hint{max-width:220px;color:var(--muted);font-size:11.5px;text-align:right}
.chat-send{width:38px;height:38px;flex:none;border:1px solid var(--ink);border-radius:50%;background:var(--acid);color:var(--acid-ink);cursor:pointer}
.chat-send>span{display:block;width:16px;height:16px;margin:auto;background:currentColor;-webkit-mask:url('/icons/arrow-right.svg') center/contain no-repeat;mask:url('/icons/arrow-right.svg') center/contain no-repeat;transform:rotate(-90deg)}
.chat-send:disabled{border-color:var(--control-border);background:var(--control-soft);color:var(--muted);cursor:not-allowed}
.chat-stop{background:var(--surface);color:var(--text)}
.chat-stop>span{-webkit-mask-image:url('/icons/player-stop.svg');mask-image:url('/icons/player-stop.svg');transform:none}


@keyframes chat-pulse{0%,100%{opacity:1}50%{opacity:.35}}
@media(prefers-reduced-motion:reduce){.chat-list-live,.chat-step.running .chat-step-mark::before,.chat-status.live .chat-status-dot,.chat-work.live .chat-work-mark{animation:none}.chat-scroll{scroll-behavior:auto}}

@media(max-width:1000px){.chat-layout{--chat-history:220px}#tab-chat .chat-chip select{max-width:130px}}
@media(max-width:860px){
  .chat-layout{grid-template-columns:minmax(0,1fr);position:relative}
  .chat-history{position:absolute;z-index:20;inset:0 auto 0 0;width:min(300px,86vw);transform:translateX(-102%);transition:transform .18s ease;box-shadow:0 20px 50px rgba(30,34,25,.16)}
  .chat-layout.history-open .chat-history{transform:none}
  .chat-history-close,.chat-history-toggle{display:grid}
  .chat-header{flex-wrap:wrap;gap:8px;padding:8px 12px}
  .chat-context{order:3;width:100%;min-width:0}
  .chat-chip{flex:1 1 0;min-width:0}#tab-chat .chat-chip select{flex:1;min-width:0;width:100%;max-width:none}
  .chat-title-wrap{min-width:0}
  .chat-context .chat-options-button{margin-left:auto}
  .chat-scroll{padding:16px 12px 8px}
  .chat-composer{padding:8px 12px 12px}
  .chat-hint{display:none}
}
@media(max-width:520px){#tab-chat .chat-chip select{max-width:110px}.chat-bubble{max-width:100%}.chat-status-meta{margin-left:0}}
@media(prefers-reduced-motion:reduce){.chat-history{transition:none}}

/* The task-details chat (dashboard-shell.css) styles .chat-step spans as fixed-width marks: not in this thread. */
.chat-thread .chat-step{color:var(--text);font-size:12.5px!important}
.chat-thread .chat-step>.chat-step-text{width:auto;flex:1;color:var(--muted);font-weight:500;text-align:left}
.chat-thread .chat-step>.chat-step-mark{width:14px}
#tab-chat .chat-input-box textarea:focus{box-shadow:none;outline:none}
/* Touch screens: every control in the chat keeps a 44px target. */
@media(max-width:860px){
  #tab-chat button,#tab-chat .chat-chip,#tab-chat .chat-list-item{min-height:44px}
  #tab-chat .chat-header .icon-button,#tab-chat .chat-send{width:44px;height:44px}
}

.chat-empty{padding:24px;gap:8px}
.chat-empty img{width:32px;height:32px}
.chat-empty h3{font-weight:500;font-size:24px;letter-spacing:-.035em}

/* Header menus share the App listbox component and always open below their trigger. */
.chat-header{position:relative;z-index:12}
#tab-chat .chat-chip{position:relative;padding:0 8px;border-radius:10px;min-width:0}
#tab-chat .chat-chip .search-select{width:160px;margin:0}
#tab-chat .chat-browser-chip .search-select{width:190px}
#tab-chat .chat-chip .search-select[hidden]{display:none}
#tab-chat .chat-chip .search-select-trigger{min-height:34px;padding:0 25px 0 4px;border:0;background:transparent;box-shadow:none;border-radius:8px;font-size:12px}
#tab-chat .chat-chip .search-select-panel{top:calc(100% + 10px);bottom:auto;left:auto;right:-8px;width:max(240px,100%);max-width:calc(100vw - 32px);border:1px solid var(--control-border);border-radius:12px;padding:4px;box-shadow:0 12px 32px rgb(0 0 0 / .14)}
#tab-chat .chat-chip .search-select-search{padding:5px;border:0}
#tab-chat .chat-chip .search-select-option{border-radius:7px}
#tab-chat .chat-chip .search-select-trigger:focus-visible{outline:2px solid var(--focus);outline-offset:3px}
@media(max-width:860px){#tab-chat .chat-chip .search-select{width:100%;min-width:0}#tab-chat .chat-chip .search-select-panel{width:240px}#tab-chat .chat-browser-chip .search-select-panel{left:-8px;right:auto}}

/* Provider identity is visually attached to the selected model, including the one-model label. */
#tab-chat .model-provider-icon{display:inline-block;flex:0 0 18px;width:18px;height:18px;background:var(--text);-webkit-mask:url('/icons/agent_model.svg') center/contain no-repeat;mask:url('/icons/agent_model.svg') center/contain no-repeat}
#tab-chat .model-provider-icon[data-provider="openai" i],#tab-chat .model-provider-icon[data-provider="openai-compatible" i]{-webkit-mask-image:url('/icons/chatgpt-symbol-black.svg');mask-image:url('/icons/chatgpt-symbol-black.svg')}
#tab-chat .model-provider-icon[data-provider="anthropic" i]{-webkit-mask-image:url('/icons/claude-symbol-black.svg');mask-image:url('/icons/claude-symbol-black.svg')}
#tab-chat .model-provider-icon[data-provider="google" i],#tab-chat .model-provider-icon[data-provider="gemini" i]{-webkit-mask-image:url('/icons/google-g.svg');mask-image:url('/icons/google-g.svg')}
/* Compact triggers; a longer browser/model name truncates, while its menu remains readable. */
#tab-chat .chat-chip{flex:0 1 auto;gap:4px;padding-inline:8px}
#tab-chat .chat-browser-chip .search-select{width:136px;min-width:0;max-width:100%}
#tab-chat .chat-model-chip .search-select{width:126px;min-width:0;max-width:100%}
#tab-chat .chat-chip .search-select-trigger{padding-right:22px;padding-left:2px}
#tab-chat .chat-chip .search-select-chevron{right:3px;width:14px;height:14px}
#tab-chat .chat-model-label{max-width:145px;overflow:hidden;text-overflow:ellipsis;padding-right:4px}
#tab-chat .chat-chip .search-select-panel{width:240px;min-width:210px;max-width:min(290px,90vw)}
@media(max-width:860px){#tab-chat .chat-browser-chip,#tab-chat .chat-model-chip{flex:1 1 0;min-width:0}#tab-chat .chat-browser-chip .search-select,#tab-chat .chat-model-chip .search-select{width:100%}}
@media(max-width:520px){#tab-chat .chat-chip .search-select-panel{min-width:185px;width:220px}}