:root{--font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;--mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;--ease: cubic-bezier(.2, .8, .2, 1);--bg: #ffffff;--bg-secondary: #f4f4f5;--sidebar-bg: #f9f9f9;--text: #0d0d0d;--text-secondary: #6e6e70;--border: rgba(0, 0, 0, .09);--hover: rgba(0, 0, 0, .045);--selected: rgba(0, 0, 0, .08);--pressed: rgba(0, 0, 0, .13);--accent: #0d0d0d;--accent-hover: #2f2f31;--on-accent: #ffffff;--bubble-user: #0d0d0d;--bubble-user-text: #ffffff;--bubble-assistant: #f4f4f5;--bubble-assistant-text: #0d0d0d;--badge-bg: rgba(0, 0, 0, .06);--ghost-btn-bg: rgba(0, 0, 0, .055);--ghost-btn-hover: rgba(0, 0, 0, .09);--ghost-btn-active: rgba(0, 0, 0, .14);--shadow: 0 2px 12px rgba(0, 0, 0, .06);--shadow-lg: 0 12px 40px rgba(0, 0, 0, .14);--toast-bg: rgba(13, 13, 13, .92);--toast-text: #ffffff;--danger: #e5484d;--warning: #f5a524}[data-theme=black]{--bg: 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0;font-size:15px}.auth-tip{margin:14px 0 0;font-size:12px;color:var(--text-secondary);text-align:center}.auth-splash{height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg);color:var(--text-secondary);font-size:14px}.user-row{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:8px 8px 2px}.user-name{flex:1;min-width:0;font-size:13px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.logout-btn{flex-shrink:0;border:1px solid var(--border);background:transparent;color:var(--text-secondary);font-size:12px;padding:5px 12px;border-radius:8px;transition:background .18s var(--ease),color .18s ease}.logout-btn:hover{background:var(--hover);color:var(--text)}.app{height:100vh;height:100dvh}.sidebar{transition:margin-left .28s var(--ease),transform .28s var(--ease)}.app:not(.sidebar-open) .sidebar{margin-left:-281px}.sidebar-top .brand{flex:1}.collapse-btn{width:28px;height:28px;flex-shrink:0;border:1px solid transparent;border-radius:8px;background:transparent;color:var(--text-secondary);font-size:20px;line-height:1;display:flex;align-items:center;justify-content:center;transition:background .15s ease,color .15s ease}.collapse-btn:hover{background:var(--hover);color:var(--text)}.sidebar-expand-btn{display:none;position:fixed;left:12px;top:14px;z-index:60;width:34px;height:34px;border-radius:50%;border:1px solid var(--border);background:var(--bg-secondary);color:var(--text);font-size:20px;line-height:1;align-items:center;justify-content:center;box-shadow:var(--shadow);transition:transform .18s var(--ease),background .18s ease}.sidebar-expand-btn:hover{background:var(--hover);transform:scale(1.06)}.app:not(.sidebar-open) .sidebar-expand-btn{display:flex}.backdrop,.menu-btn{display:none}@media (max-width: 768px){.sidebar{position:fixed;left:0;top:0;bottom:0;width:min(300px,84vw);z-index:50;transform:translate(-105%);box-shadow:var(--shadow-lg)}.app.sidebar-open .sidebar{transform:translate(0)}.app.sidebar-open .backdrop{display:block;position:fixed;top:0;right:0;bottom:0;left:0;z-index:40;background:#00000052;animation:fade-in .2s ease}.sidebar-expand-btn{display:none!important}.menu-btn{display:flex;flex-shrink:0}.main{position:relative}.chat-header{padding:10px 12px 0}.chat-header-main{gap:8px;padding-bottom:10px}.chat-char-name{font-size:16px}.chat-conv-title{max-width:34%}.context-bar{margin:0 -12px}.messages{padding:14px 12px}.bubble{max-width:86%}.composer{padding:8px 12px calc(10px + env(safe-area-inset-bottom))}.settings{padding:16px 16px 48px}.settings-head{margin-bottom:14px}.empty-state{padding:0 28px}.empty-state .menu-btn{position:absolute;top:12px;left:12px}.modal-overlay{align-items:flex-end;padding:0}.modal{width:100%;max-width:100%;max-height:92dvh;overflow-y:auto;padding:8px 20px calc(20px + env(safe-area-inset-bottom));border-radius:20px 20px 0 0;border-bottom:none;animation:sheet-up .28s var(--ease)}@keyframes sheet-up{0%{transform:translateY(48px);opacity:.4}to{transform:none;opacity:1}}.modal:before{content:"";display:block;width:36px;height:4px;border-radius:2px;background:var(--border);margin:4px auto 10px}.modal-head{position:sticky;top:-8px;z-index:5;margin:0 -20px 12px;padding:10px 20px;background:var(--bg-secondary)}.toast{left:16px;right:16px;top:auto;bottom:calc(16px + env(safe-area-inset-bottom));text-align:center}}