:root{--bg: #ffffff;--bg-sidebar: #f7f7f5;--bg-elev: #ffffff;--bg-hover: #efefed;--bg-input: #ffffff;--border: #e3e2e0;--text: #1a1a19;--text-dim: #5f5e5b;--text-mute: #9b9a97;--accent: #2f6fed;--accent-strong: #1f5bd6;--user-bg: #f1f1ef;--code-bg: #f4f4f2;--selected: #e8e8e5;--radius: 10px;--sidebar-w: 280px;--content-max: 760px;--font: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;--mono: "IBM Plex Mono", "SF Mono", ui-monospace, monospace;--shadow-soft: 0 1px 2px rgba(15, 15, 15, .04), 0 10px 28px rgba(15, 15, 15, .06)}*{box-sizing:border-box}html,body,#app{margin:0;height:100%;overflow:hidden}body{background:var(--bg);color:var(--text);font-family:var(--font)}button,input,textarea,select{font:inherit;color:var(--text)}.app{display:grid;grid-template-columns:var(--sidebar-w) minmax(0,1fr);height:100%;overflow:hidden}.sidebar{width:var(--sidebar-w);min-width:var(--sidebar-w);max-width:var(--sidebar-w);display:flex;flex-direction:column;border-right:1px solid var(--border);background:var(--bg-sidebar);min-height:0;z-index:2;overflow:hidden}.sidebar-top{flex:0 0 auto;padding:16px 14px 12px;display:flex;flex-direction:column;gap:12px}.brand{display:flex;align-items:center;gap:10px;min-width:0}.brand-logo{width:28px;height:28px;flex-shrink:0;border-radius:7px;display:block;object-fit:contain;background:#fff;border:1px solid var(--border)}.brand-name{font-weight:500;letter-spacing:.02em;font-size:13px;color:var(--text-dim);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.btn-new{width:100%;border:1px solid var(--border);background:var(--bg-elev);border-radius:8px;padding:10px 12px;cursor:pointer;display:flex;align-items:center;gap:8px;transition:border-color .15s ease,background .15s ease}.btn-new:hover{border-color:#cfcfcb;background:var(--bg-hover)}.btn-new-icon{font-size:16px;line-height:1;color:var(--text)}.chat-list{flex:1 1 auto;overflow-x:hidden;overflow-y:auto;padding:4px 10px 16px;min-height:0;width:100%}.group-label{margin:14px 6px 6px;font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--text-mute)}.chat-item{width:100%;max-width:100%;border:0;background:transparent;border-radius:8px;padding:8px;cursor:pointer;color:var(--text-dim);display:flex;align-items:center;gap:10px;min-width:0;text-decoration:none}.chat-item:hover{background:var(--bg-hover);color:var(--text)}.chat-item.active{background:var(--selected);color:var(--text)}.chat-item-icon{width:16px;height:16px;flex-shrink:0;opacity:.75}.chat-item.active .chat-item-icon{opacity:1}.chat-item-title{flex:1 1 auto;min-width:0;text-align:left;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:13.5px;line-height:1.3}.sidebar-foot{flex:0 0 auto;padding:12px 14px 16px;border-top:1px solid var(--border)}.sidebar-foot-row{display:flex;align-items:center;justify-content:space-between;gap:8px;min-width:0}.btn-logout{flex:0 0 auto;font-size:11px;line-height:1.2;color:var(--text-mute);background:transparent;border:1px solid var(--border);border-radius:999px;padding:4px 10px;cursor:pointer;transition:color .15s ease,border-color .15s ease}.btn-logout:hover{color:var(--text);border-color:var(--text-mute)}.badge{display:inline-block;font-size:11px;color:var(--text-mute);border:1px solid var(--border);border-radius:999px;padding:4px 8px}.badge.warn{color:#9a6700;border-color:#e8d5a3;background:#fff8e7}.main{position:relative;display:flex;flex-direction:column;min-width:0;min-height:0;overflow:hidden;z-index:1}.main-bg{position:absolute;inset:0;z-index:0;pointer-events:none;background:radial-gradient(900px 480px at 12% -10%,rgba(47,111,237,.05) 0%,transparent 58%),radial-gradient(700px 420px at 100% 0%,rgba(15,15,15,.03) 0%,transparent 55%),linear-gradient(180deg,#fafafa 0%,var(--bg) 70%)}.chat-header{position:relative;z-index:1;flex:0 0 auto;padding:12px 16px;border-bottom:1px solid var(--border);background:#ffffffd1;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.chat-header-inner{max-width:var(--content-max);margin:0 auto;width:100%;display:flex;align-items:center;gap:10px;min-width:0}.btn-menu{display:none;flex:0 0 auto;width:40px;height:40px;border:1px solid var(--border);border-radius:10px;background:var(--bg-elev);cursor:pointer;padding:0;align-items:center;justify-content:center}.btn-menu:hover{background:var(--bg-hover)}.btn-menu-bars,.btn-menu-bars:before,.btn-menu-bars:after{display:block;width:16px;height:1.5px;background:var(--text);border-radius:2px;position:relative}.btn-menu-bars:before,.btn-menu-bars:after{content:"";position:absolute;left:0}.btn-menu-bars:before{top:-5px}.btn-menu-bars:after{top:5px}.chat-header h1{margin:0;flex:1 1 auto;min-width:0;font-size:15px;font-weight:560;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar-overlay{display:none}.messages{position:relative;z-index:1;flex:1 1 auto;overflow-x:hidden;overflow-y:auto;min-height:0;padding:28px 24px 40px}.messages-inner{max-width:var(--content-max);margin:0 auto;width:100%}.empty-state{max-width:420px;margin:12vh auto 0;text-align:center;color:var(--text-dim)}.empty-title{margin:0 0 8px;color:var(--text);font-size:20px;font-weight:600}.empty-sub{margin:0;line-height:1.5;font-size:14px}.empty-sub code{font-family:var(--mono);overflow-wrap:anywhere}.btn-empty-action{margin-top:18px;border:1px solid var(--border);background:var(--bg-elev);border-radius:8px;padding:9px 14px;cursor:pointer;color:var(--text)}.btn-empty-action:hover{border-color:var(--accent-strong);background:var(--bg-hover)}.msg{display:grid;grid-template-columns:28px minmax(0,1fr);gap:14px;margin:0 0 22px}.msg-avatar{width:28px;height:28px;border-radius:8px;display:grid;place-items:center;font-size:12px;font-weight:700;margin-top:2px}.msg.user .msg-avatar{background:#e8eefc;color:var(--accent-strong)}.msg.assistant .msg-avatar{background:#e7f5ee;color:#0f7a4d}.msg-body{min-width:0;line-height:1.55;font-size:14.5px;overflow-wrap:anywhere}.msg.user .msg-body{background:var(--user-bg);border:1px solid var(--border);border-radius:var(--radius);padding:12px 14px}.msg-body p{margin:0 0 .8em}.msg-body p:last-child{margin-bottom:0}.msg-body pre{background:var(--code-bg);border:1px solid var(--border);border-radius:8px;padding:12px;overflow-x:auto;font-family:var(--mono);font-size:12.5px}.msg-body code{font-family:var(--mono);font-size:.92em}.msg-body :not(pre)>code{background:var(--code-bg);padding:.1em .35em;border-radius:4px}.msg-body table{border-collapse:collapse;width:100%;margin:.8em 0;font-size:13px}.msg-body th,.msg-body td{border:1px solid var(--border);padding:6px 8px;text-align:left}.msg-body th{background:var(--bg-hover)}.msg-meta{margin-top:6px;font-size:11px;color:var(--text-mute)}.messages-load-sentinel{text-align:center;padding:8px 12px 12px;font-size:12px;color:var(--text-mute);-webkit-user-select:none;user-select:none}.messages-load-sentinel.loading{color:var(--accent)}.composer{position:relative;z-index:1;flex:0 0 auto;padding:0 24px 22px}.btn-scroll-bottom{position:absolute;z-index:2;right:max(24px,calc(50% - var(--content-max) / 2));bottom:calc(100% + 10px);width:40px;height:40px;border:1px solid var(--border);border-radius:50%;background:var(--bg-elev);color:var(--text);cursor:pointer;padding:0;display:grid;place-items:center;box-shadow:var(--shadow-soft);opacity:0;visibility:hidden;pointer-events:none;transform:translateY(8px) scale(.96);transition:opacity .16s ease,transform .16s ease,visibility .16s,background .12s ease,border-color .12s ease}.btn-scroll-bottom.is-visible{opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0) scale(1)}.btn-scroll-bottom:hover{background:var(--bg-hover);border-color:#cfcfcb;color:var(--accent)}.btn-scroll-bottom:focus-visible{outline:2px solid var(--accent-strong);outline-offset:2px}.btn-scroll-bottom-icon{display:block}.composer-box{max-width:var(--content-max);margin:0 auto;width:100%;border:1px solid var(--border);background:var(--bg-input);border-radius:16px;padding:10px 12px 8px;box-shadow:var(--shadow-soft)}.composer-box textarea{width:100%;border:0;outline:none;resize:none;background:transparent;color:var(--text);caret-color:var(--accent-strong);min-height:44px;max-height:180px;line-height:1.45;padding:4px 4px 8px}.composer-box textarea::placeholder{color:var(--text-mute)}.composer-box textarea:disabled{opacity:.55}.composer-bar{display:flex;justify-content:space-between;align-items:center;gap:10px}.composer-bar-left{display:flex;align-items:center;gap:8px;min-width:0;flex:1 1 auto}.btn-attach{flex:0 0 auto;width:34px;height:34px;border:1px solid var(--border);border-radius:8px;background:var(--bg-elev);color:var(--text-dim);cursor:pointer;display:grid;place-items:center;padding:0;transition:border-color .15s ease,background .15s ease,color .15s ease}.btn-attach:hover:not(:disabled){border-color:#cfcfcb;background:var(--bg-hover);color:var(--accent)}.btn-attach:disabled{opacity:.45;cursor:not-allowed}.attachment-list{display:flex;flex-wrap:wrap;gap:8px;padding:0 4px 10px}.attachment-chip{display:inline-flex;align-items:center;gap:8px;max-width:100%;border:1px solid var(--border);background:var(--bg-elev);border-radius:10px;padding:6px 8px 6px 6px}.attachment-thumb{width:36px;height:36px;border-radius:6px;object-fit:cover;display:block;cursor:zoom-in}.attachment-file-icon{width:36px;height:36px;display:grid;place-items:center;font-size:18px}.attachment-chip-name{font-size:12px;max-width:180px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.attachment-chip-size{font-size:11px;color:var(--text-mute);white-space:nowrap}.attachment-remove{border:0;background:transparent;color:var(--text-mute);cursor:pointer;font-size:16px;line-height:1;padding:0 2px}.attachment-remove:hover{color:var(--text)}.msg-attachments{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:8px}.msg-attachment.image{display:block;padding:0;border:0;background:none;cursor:zoom-in}.msg-attachment.image img{display:block;max-width:min(320px,100%);max-height:240px;border-radius:10px;border:1px solid var(--border)}.msg-attachment.file{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border:1px solid var(--border);border-radius:8px;background:var(--bg-hover);color:var(--accent);text-decoration:none;font-size:13px}.msg-attachment.file:hover{background:var(--bg-hover)}.model-picker{position:relative;min-width:0;max-width:min(340px,58vw)}.model-trigger{display:inline-flex;align-items:center;gap:8px;max-width:100%;border:1px solid var(--border);background:var(--bg-elev);border-radius:8px;padding:6px 10px;cursor:pointer;transition:border-color .15s ease,background .15s ease}.model-trigger:hover:not(:disabled){border-color:#cfcfcb;background:var(--bg-hover)}.model-trigger:disabled{opacity:.55;cursor:not-allowed}.model-trigger-label{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px;color:var(--text)}.model-trigger-chevron{flex:0 0 auto;width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid var(--text-mute);transition:transform .15s ease}.model-picker.open .model-trigger-chevron{transform:rotate(180deg)}.model-menu{position:absolute;left:0;bottom:calc(100% + 8px);z-index:20;min-width:max(100%,220px);max-width:min(360px,86vw);max-height:min(340px,50vh);overflow:auto;padding:6px;border:1px solid var(--border);border-radius:10px;background:var(--bg-elev);box-shadow:var(--shadow-soft)}.model-menu-sep{margin:8px 8px 4px;font-size:10px;text-transform:uppercase;letter-spacing:.08em;color:var(--text-mute)}.model-menu-sep.bare{margin:4px 8px;height:1px;background:var(--border);text-indent:-9999px}.model-menu-item{width:100%;display:grid;grid-template-columns:16px minmax(0,1fr) auto;align-items:center;gap:8px;border:0;background:transparent;border-radius:7px;padding:8px;cursor:pointer;text-align:left;color:var(--text-dim)}.model-menu-item:hover{background:var(--bg-hover);color:var(--text)}.model-menu-item.selected{color:var(--text);background:var(--selected)}.model-menu-item.other{color:var(--accent)}.model-menu-check{font-size:12px;color:var(--accent);line-height:1}.model-menu-text{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px}.model-menu-fav{color:#db2777;font-size:12px}body.modal-open{overflow:hidden}.image-preview-modal{position:fixed;inset:0;z-index:90;display:grid;place-items:center;padding:24px}.image-preview-modal[hidden]{display:none!important}.image-preview-backdrop{position:absolute;inset:0;border:0;padding:0;margin:0;background:#000000d1;cursor:zoom-out}.image-preview-dialog{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center;gap:12px;max-width:min(96vw,1200px);max-height:92vh}.image-preview-close{position:absolute;top:-12px;right:-12px;z-index:2;width:36px;height:36px;border:1px solid var(--border);border-radius:999px;background:var(--bg-elev);color:var(--text);font-size:22px;line-height:1;cursor:pointer}.image-preview-close:hover{background:var(--bg-hover)}.image-preview-img{display:block;max-width:100%;max-height:calc(92vh - 48px);object-fit:contain;border-radius:12px;box-shadow:0 16px 48px #0f0f0f47}.image-preview-caption{margin:0;max-width:100%;color:#ffffffeb;font-size:13px;text-align:center;word-break:break-word}.model-modal{position:fixed;inset:0;z-index:80;display:grid;place-items:center;padding:16px}.model-modal[hidden]{display:none!important}.model-modal-backdrop{position:absolute;inset:0;border:0;padding:0;margin:0;background:#0000009e;cursor:pointer}.model-modal-dialog{position:relative;z-index:1;width:min(560px,100%);max-height:min(820px,88vh);display:flex;flex-direction:column;border:1px solid var(--border);border-radius:14px;background:var(--bg-elev);box-shadow:0 16px 48px #0f0f0f1f;overflow:hidden}.model-modal-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px 6px}.model-modal-header h2{margin:0;font-size:16px;font-weight:600}.model-modal-close{width:32px;height:32px;border:1px solid var(--border);border-radius:8px;background:var(--bg-elev);cursor:pointer;font-size:20px;line-height:1;color:var(--text-dim)}.model-modal-close:hover{background:var(--bg-hover);color:var(--text)}.model-modal-search-wrap{padding:0 16px 10px}.model-modal-search{width:100%;box-sizing:border-box;padding:9px 12px;border:1px solid var(--border);border-radius:8px;background:var(--bg-input);color:var(--text);font:inherit;font-size:14px;line-height:1.3}.model-modal-search::placeholder{color:var(--text-mute)}.model-modal-search:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #2f6fed26}.model-modal-search::-webkit-search-cancel-button{cursor:pointer}.model-modal-hint{margin:0;padding:0 16px 10px;font-size:12.5px;color:var(--text-mute);line-height:1.4}.model-modal-body{overflow:auto;padding:4px 10px 14px;min-height:0}.model-modal-empty{margin:24px;text-align:center;color:var(--text-mute)}.model-group{margin:0 0 12px}.model-group-title{margin:10px 6px 6px;font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--text-mute);font-weight:600}.model-group-list{display:flex;flex-direction:column;gap:2px}.model-row{display:grid;grid-template-columns:minmax(0,1fr) 36px;align-items:stretch;border-radius:8px}.model-row.selected{background:var(--selected)}.model-row-pick{display:grid;grid-template-columns:18px minmax(0,1fr);gap:10px;align-items:center;border:0;background:transparent;border-radius:8px;padding:8px;cursor:pointer;text-align:left;color:var(--text-dim);min-width:0}.model-row-pick:hover{background:var(--bg-hover);color:var(--text)}.model-row.selected .model-row-pick{color:var(--text)}.model-row-radio{color:var(--accent);font-size:12px;line-height:1}.model-row-label{min-width:0;display:flex;flex-direction:column;gap:1px}.model-row-name{font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.model-row-id{font-size:11px;color:var(--text-mute);font-family:var(--mono);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.model-fav-btn{border:0;background:transparent;border-radius:8px;cursor:pointer;color:var(--text-mute);font-size:16px;line-height:1}.model-fav-btn:hover:not(:disabled){background:var(--bg-hover);color:#db2777}.model-fav-btn.on{color:#db2777}.model-fav-btn.pinned{color:#b45309;cursor:default;opacity:.9}.btn-send{flex:0 0 auto;width:36px;height:36px;border:0;background:#1a1a19;color:#fff;border-radius:10px;padding:0;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:filter .15s ease,opacity .15s ease}.btn-send-icon{display:block}.btn-send:disabled{opacity:.45;cursor:not-allowed}.btn-send:not(:disabled):hover{filter:brightness(1.05)}.typing{color:var(--text-mute);font-style:italic}@media(max-width:800px){.app{grid-template-columns:1fr}.btn-menu{display:inline-flex}.sidebar{position:fixed;top:0;left:0;bottom:0;z-index:40;transform:translate(-105%);transition:transform .2s ease;box-shadow:8px 0 32px #0f0f0f1f}.app.sidebar-open .sidebar{transform:translate(0)}.sidebar-overlay{display:block;position:fixed;inset:0;z-index:30;background:#0f0f0f47;border:0;padding:0;margin:0;cursor:pointer}.sidebar-overlay[hidden]{display:none!important}.composer{padding:0 12px 14px}.btn-scroll-bottom{right:12px;bottom:calc(100% + 8px)}.messages{padding:20px 12px 28px}.chat-header{padding:10px 12px}.model-picker{max-width:min(210px,52vw)}.model-modal{padding:10px}.model-modal-dialog{max-height:92vh}}.login-page{min-height:100%;overflow:auto;background:radial-gradient(1200px 600px at 10% -10%,rgba(47,111,237,.08),transparent 55%),radial-gradient(900px 500px at 100% 0%,rgba(15,15,15,.03),transparent 50%),#f7f7f5}.login-shell{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px 16px}.login-card{width:min(100%,380px);background:var(--bg-elev);border:1px solid var(--border);border-radius:16px;padding:28px 24px 24px;box-shadow:var(--shadow-soft)}.login-brand{text-align:center;margin-bottom:24px}.login-logo{border-radius:10px;margin-bottom:12px}.login-title{margin:0 0 8px;font-size:1.35rem;font-weight:600}.login-sub{margin:0;color:var(--text-dim);font-size:.92rem;line-height:1.45}.login-form{display:flex;flex-direction:column;gap:14px}.login-field{display:flex;flex-direction:column;gap:6px}.login-label{font-size:.82rem;color:var(--text-dim)}.login-field input{width:100%;border:1px solid var(--border);background:var(--bg-input);color:var(--text);caret-color:var(--accent-strong);border-radius:10px;padding:11px 12px;outline:none;transition:border-color .15s ease,box-shadow .15s ease}.login-field input::placeholder{color:var(--text-mute)}.login-field input:-webkit-autofill,.login-field input:-webkit-autofill:hover,.login-field input:-webkit-autofill:focus{-webkit-text-fill-color:var(--text);-webkit-box-shadow:0 0 0 1000px var(--bg-input) inset;caret-color:var(--accent-strong)}.login-field input:focus{border-color:var(--accent-strong);box-shadow:0 0 0 3px #2f6fed26}.login-error{margin:0;font-size:.85rem;color:#c62828;line-height:1.4}.login-submit{margin-top:4px;border:none;border-radius:10px;padding:11px 14px;background:#1a1a19;color:#fff;font-weight:600;cursor:pointer;transition:filter .15s ease,transform .1s ease}.login-submit:hover:not(:disabled){filter:brightness(1.05)}.login-submit:active:not(:disabled){transform:translateY(1px)}.login-submit:disabled{opacity:.7;cursor:not-allowed}