:root{--primary: #000000;--primary-soft: #1f1f1f;--bg-main: #f5f5f5;--panel-white: #ffffff;--panel-soft: #f0f0f0;--border-subtle: #e5e5e5;--border-strong: #000000;--text-main: #1a1a1a;--text-muted: #666666;--text-soft: #999999;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--radius-full: 9999px;--trans-fast: .15s ease-out;--trans-med: .25s ease-out}*{margin:0;padding:0;box-sizing:border-box}html{height:100%}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica 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var(--border-subtle);position:relative;z-index:10}.top-header-left{display:flex;align-items:center;gap:16px}.top-header-logo{display:flex;align-items:center;gap:12px}.top-header-logo-mark{width:36px;height:36px;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center}.top-header-title{font-size:.8rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase}.badge-version{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--border-strong);font-size:.55rem;padding:2px 6px;margin-left:8px}.top-header-right{display:flex;align-items:center;gap:12px}.header-search-wrapper{position:relative}.header-search{display:flex;align-items:center;gap:8px;background:var(--bg-main);border:1px solid var(--border-subtle);padding:4px 10px}.header-search-dropdown{position:absolute;top:100%;left:0;right:0;margin-top:4px;max-height:280px;overflow-y:auto;background:var(--panel-white);border:1px solid var(--border-subtle);border-radius:var(--radius-md);box-shadow:0 4px 12px #00000014;z-index:30}.header-search-dropdown-item{display:block;width:100%;padding:10px 12px;text-align:left;border:none;background:transparent;color:var(--text-main);font-size:.875rem;cursor:pointer;border-bottom:1px solid var(--border-subtle);transition:background var(--trans-fast)}.header-search-dropdown-item:last-child{border-bottom:none}.header-search-dropdown-item:hover{background:var(--panel-soft)}.header-search-dropdown-item .history-item-title{font-weight:500;margin-bottom:2px}.header-search-dropdown-item .history-item-meta{font-size:.7rem;color:var(--text-muted)}.header-search input{border:none;background:transparent;font-size:.75rem;color:var(--text-main);width:200px;min-width:0}.header-search-clear{display:flex;align-items:center;justify-content:center;padding:2px;border:none;background:transparent;color:var(--text-muted);cursor:pointer;border-radius:var(--radius-sm);transition:color 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24px;gap:16px;font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.1em;justify-content:flex-start;border-left:4px solid var(--primary);flex-shrink:0;min-width:0;width:calc(100% - 48px);box-sizing:border-box;background:var(--primary);color:#fff;border-color:var(--primary)}.sidebar-scroll>.sidebar-new-session-btn:hover{background:var(--primary-soft);border-color:var(--primary-soft);color:#fff}.sidebar-scroll>.history-header{margin:16px 24px 8px;padding:0;flex-shrink:0}.sidebar-scroll>.history-list{min-width:0;overflow-x:hidden}.history-item{padding:0 8px 0 0;margin:0 24px;border:none;border-left:4px solid transparent;min-width:0;overflow:hidden;flex-shrink:0;background:transparent}.history-item:hover{background:var(--bg-main)}.history-item-active{border-left-color:var(--primary);background:var(--bg-main)}.history-item-main{padding:16px 0;gap:16px;min-width:0;overflow:hidden}.history-item-title{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.1em}.history-item-text{min-width:0;overflow:hidden}.history-item-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.history-item-meta{font-size:10px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-center{padding:20px 16px 0;min-width:0}.chat-scroll{padding:20px 4px 20px 16px;gap:32px;min-width:0}.message-list{gap:32px}.message-row{gap:12px;min-width:0}.message-bubble{min-width:0}.message-avatar,.message-avatar-user{width:32px;height:32px}.message-bubble{max-width:85%;padding:16px;font-size:13px;box-shadow:0 1px 3px #0000000d;word-wrap:break-word;overflow-wrap:break-word}.message-bubble-user{background:var(--primary);color:#fff;border:1px solid var(--border-strong)}.chat-input-shell{padding:16px;padding-bottom:max(calc(32px + env(safe-area-inset-bottom)),48px);background:var(--bg-main);border-top:1px solid var(--border-subtle)}.chat-input-row{min-width:0}.chat-input-panel{border:1px solid var(--border-subtle);padding:6px;background:var(--panel-white);transition:border-color var(--trans-fast)}.chat-input-panel:focus-within{border-color:var(--primary)}.textarea-shell{font-size:14px;padding:8px}.textarea-shell::placeholder{color:var(--text-muted)}.chat-input-right{flex-shrink:0;min-width:44px}.chat-input-right .action-btn{width:44px;height:44px;min-width:44px;min-height:44px;padding:10px}.chat-input-row .chat-input-right button.send-btn.chat-send-btn{height:44px;min-height:44px;min-width:44px;width:44px;padding:0;display:flex;align-items:center;justify-content:center;color:var(--text-main);background:transparent url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cline x1='22' y1='2' x2='11' y2='13'/%3E%3Cpolygon points='22 2 15 22 11 13 2 9 22 2'/%3E%3C/svg%3E") no-repeat center / 20px 20px;flex-shrink:0;overflow:visible;border:none;border-radius:0}.chat-input-right .chat-send-btn .chat-send-btn-icon{display:flex;align-items:center;justify-content:center;width:20px;height:20px;flex-shrink:0;pointer-events:none}.chat-input-right .chat-send-btn .chat-send-btn-icon svg{display:block;width:20px;height:20px;min-width:20px;min-height:20px;flex-shrink:0}.chat-input-right .chat-send-btn:disabled .chat-send-btn-icon{display:none}.chat-input-right .chat-send-btn .chat-send-btn-loading{font-size:14px;color:var(--text-main)}.chat-model-selector-wrapper{display:none}::-webkit-scrollbar{width:4px;height:4px}::-webkit-scrollbar-track{background:#f5f5f5}::-webkit-scrollbar-thumb{background:#ccc;border-radius:0}.chat-error-banner{word-wrap:break-word;overflow-wrap:break-word;font-size:.8rem}.modal-overlay{padding:max(16px,env(safe-area-inset-top)) max(16px,env(safe-area-inset-right)) max(16px,env(safe-area-inset-bottom)) max(16px,env(safe-area-inset-left));align-items:center}.modal-box{width:100%;max-width:min(calc(100vw - 32px),360px);margin:0 auto}.modal-actions{flex-wrap:wrap;gap:12px}.modal-btn{min-height:44px;min-width:80px}.image-overlay{padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}}