/* ===== 全局重置 ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:#1a1a2e;color:#e0e0e0;height:100vh;overflow:hidden}

/* ===== 顶部导航 ===== */
.ai-nav{position:fixed;top:0;left:0;right:0;z-index:200;background:rgba(15,15,30,0.92);backdrop-filter:blur(10px);height:52px;border-bottom:1px solid rgba(255,255,255,0.06)}
.ai-nav-inner{max-width:1400px;margin:0 auto;height:100%;display:flex;align-items:center;padding:0 20px;gap:24px}
.ai-nav-brand{font-size:18px;font-weight:700;color:#a5b4fc;text-decoration:none}
.ai-nav-links{display:flex;gap:16px}
.ai-nav-links a{color:rgba(255,255,255,0.6);text-decoration:none;font-size:14px;transition:color .2s}
.ai-nav-links a:hover,.ai-nav-links a.active{color:#c7d2fe}

/* ===== 布局 ===== */
.ai-layout{display:flex;height:100vh;padding-top:52px}
.ai-page{margin-left:260px;flex:1;display:flex;flex-direction:column;min-width:0;height:100%;overflow:hidden;transition:margin-left .25s}

/* ===== 侧边栏 ===== */
.ai-sidebar{position:fixed;top:52px;left:0;width:260px;height:calc(100vh - 52px);background:#151525;border-right:1px solid rgba(255,255,255,0.06);display:flex;flex-direction:column;overflow-y:auto;overflow-x:hidden;transition:transform .25s,width .25s;z-index:150}
.ai-sidebar.collapsed{transform:translateX(-260px);overflow:hidden}
/* hover 临时展开 */
.ai-sidebar.collapsed:hover{transform:translateX(0);box-shadow:4px 0 20px rgba(0,0,0,0.5)}

.sidebar-top{display:flex;align-items:center;padding:12px;gap:8px;border-bottom:1px solid rgba(255,255,255,0.05)}
.sidebar-collapse-btn,.sidebar-new-chat-btn{background:rgba(255,255,255,0.06);border:none;color:rgba(255,255,255,0.6);cursor:pointer;border-radius:8px;display:flex;align-items:center;gap:6px;padding:8px 10px;font-size:13px;transition:all .2s}
.sidebar-collapse-btn:hover,.sidebar-new-chat-btn:hover{background:rgba(255,255,255,0.1);color:#c7d2fe}
.sidebar-new-chat-btn{flex:1;justify-content:center}
.sidebar-section{padding:12px;border-bottom:1px solid rgba(255,255,255,0.04)}
.sidebar-section-title{font-size:11px;text-transform:uppercase;color:rgba(255,255,255,0.3);margin-bottom:8px;letter-spacing:1px}
.sidebar-mode-btn{display:block;width:100%;padding:8px 12px;border:none;background:rgba(255,255,255,0.03);color:rgba(255,255,255,0.55);font-size:13px;text-align:left;border-radius:6px;cursor:pointer;margin-bottom:4px;transition:all .2s}
.sidebar-mode-btn:hover{background:rgba(255,255,255,0.06);color:#c7d2fe}
.sidebar-mode-btn.active{background:rgba(79,111,191,0.2);color:#a5b4fc}

/* 深度思考开关 */
.toggle-switch{display:flex;align-items:center;gap:10px;cursor:pointer}
.toggle-switch input{display:none}
.toggle-slider{width:36px;height:20px;background:rgba(255,255,255,0.15);border-radius:20px;position:relative;transition:background .2s}
.toggle-slider::after{content:'';position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:#fff;transition:transform .2s}
.toggle-switch input:checked+.toggle-slider{background:#4f6fbf}
.toggle-switch input:checked+.toggle-slider::after{transform:translateX(16px)}
.toggle-label{font-size:13px;color:rgba(255,255,255,0.55)}

/* 对话列表 */
.sidebar-list{flex:1;overflow-y:auto;padding:8px}
.sidebar-item{padding:10px 12px;border-radius:8px;cursor:pointer;transition:background .15s;margin-bottom:2px;display:flex;align-items:center;gap:8px}
.sidebar-item:hover{background:rgba(255,255,255,0.05)}
.sidebar-item.active{background:rgba(79,111,191,0.15)}
.sidebar-item-body{flex:1;min-width:0}
.sidebar-item-title{font-size:13px;color:rgba(255,255,255,0.75);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sidebar-item-time{font-size:11px;color:rgba(255,255,255,0.25);margin-top:2px}
.sidebar-item-actions{display:flex;gap:2px;opacity:0;transition:opacity .15s}
.sidebar-item:hover .sidebar-item-actions{opacity:1}
.sidebar-item-edit,.sidebar-item-del{background:none;border:none;color:rgba(255,255,255,0.25);cursor:pointer;padding:4px;border-radius:4px;transition:all .15s}
.sidebar-item-edit:hover{color:#a5b4fc;background:rgba(79,111,191,0.15)}
.sidebar-item-del:hover{color:#ef4444;background:rgba(239,68,68,0.15)}
.sidebar-item-input{flex:1;background:rgba(255,255,255,0.08);border:1px solid #4f6fbf;border-radius:4px;color:#e0e0e0;font-size:13px;padding:4px 6px;outline:none}
.sidebar-empty{text-align:center;color:rgba(255,255,255,0.2);font-size:12px;padding:20px}

/* 移动端 */
.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,0.5);z-index:250}
.sidebar-overlay.show{display:block}
@media(max-width:900px){
    .ai-sidebar{position:fixed;left:0;top:52px;bottom:0;z-index:300;width:280px;height:auto;transform:translateX(-100%);transition:transform .25s}
    .ai-sidebar:not(.collapsed){transform:translateX(0)}
    .ai-sidebar.collapsed{width:280px;transform:translateX(-100%)}
    .sidebar-collapse-btn{display:none}
}

/* ===== 消息区 ===== */
.ai-messages{flex:1;overflow-y:auto;padding:16px 40px 140px 40px;display:flex;flex-direction:column;gap:12px;max-width:900px;width:100%;margin:0 auto;scroll-behavior:smooth}
.ai-msg{display:flex;flex-direction:column}
.ai-msg{max-width:85%;margin-bottom:20px}
.ai-msg.user{align-self:flex-end;align-items:flex-end;max-width:80%;margin-right:16px}
.ai-msg.assistant{align-self:flex-start;align-items:flex-start;max-width:85%;margin-left:16px}
.ai-bubble{padding:12px 16px;border-radius:18px;line-height:1.7;font-size:14px;word-break:break-word;transition:all .2s ease}
.ai-msg.user .ai-bubble{background:linear-gradient(135deg,#2b5278,#1e3a5f);color:#fff;border-bottom-right-radius:6px;box-shadow:0 2px 8px rgba(0,0,0,0.2)}
.ai-msg.assistant .ai-bubble{background:rgba(42,42,58,0.8);color:#e0e0e0;border-bottom-left-radius:6px;box-shadow:0 2px 8px rgba(0,0,0,0.2);backdrop-filter:blur(4px)}
.ai-bubble pre{background:#1a1a2e;padding:12px 16px;border-radius:10px;overflow-x:auto;margin:8px 0;font-size:13px;border:1px solid rgba(255,255,255,0.04)}
.ai-bubble code{font-family:"Fira Code","Consolas",monospace;font-size:13px}
.ai-bubble p{margin:6px 0}
.ai-bubble ul,.ai-bubble ol{margin:6px 0;padding-left:20px}
.ai-bubble blockquote{border-left:3px solid rgba(255,255,255,0.15);padding-left:12px;color:rgba(255,255,255,0.55);margin:8px 0}
.typing-cursor{display:inline-block;width:2px;height:16px;background:#a5b4fc;animation:blink .8s infinite;vertical-align:text-bottom;margin-left:2px}
@keyframes blink{50%{opacity:0}}
@keyframes spin{to{transform:rotate(360deg)}}

/* 消息操作按钮 */
.ai-msg-actions{display:flex;gap:6px;margin-top:8px;opacity:0;transition:opacity .2s ease}
.ai-msg.assistant:hover .ai-msg-actions{opacity:1}
.ai-msg-action-btn{background:rgba(255,255,255,0.06);border:none;color:rgba(255,255,255,0.4);font-size:11px;padding:4px 8px;border-radius:6px;cursor:pointer;transition:all .2s ease}
.ai-msg-action-btn:hover{background:rgba(255,255,255,0.12);color:rgba(255,255,255,0.8)}
.ai-msg-action-btn.copied{color:#10b981}

/* 文件标签 */
.ai-msg-files{display:flex;gap:4px;flex-wrap:wrap;margin-bottom:4px;justify-content:flex-end}
.ai-msg-file-tag{display:flex;align-items:center;gap:4px;background:rgba(255,255,255,0.1);border-radius:6px;padding:4px 8px;font-size:11px;color:rgba(255,255,255,0.6)}
.ai-files-container{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:8px;max-width:700px;width:100%}
.ai-file-tag{display:flex;align-items:center;gap:6px;background:rgba(79,111,191,0.2);border:1px solid rgba(79,111,191,0.3);border-radius:8px;padding:6px 10px;font-size:12px;color:#c7d2fe}
.ai-file-tag-remove{background:none;border:none;color:rgba(255,255,255,0.4);cursor:pointer;padding:2px}

/* 代码块 */
.code-block-wrapper{position:relative}
.code-copy-btn{position:absolute;top:8px;right:8px;background:rgba(255,255,255,0.08);border:none;color:rgba(255,255,255,0.4);font-size:11px;padding:4px 8px;border-radius:4px;cursor:pointer;display:flex;align-items:center;gap:4px}
.code-copy-btn:hover{background:rgba(255,255,255,0.15);color:#fff}
.code-copy-btn.copied{color:#10b981}

/* ===== 输入栏 ===== */
.ai-input-bar{position:fixed;bottom:0;left:260px;right:0;z-index:100;background:transparent;padding:8px 20px 16px;display:flex;flex-direction:column;align-items:center;transition:left .25s}
.ai-input-inner{width:100%;max-width:900px;display:flex;flex-direction:column;background:#1e1e2e;border:1px solid rgba(255,255,255,0.08);border-radius:16px;overflow:hidden}

#ai-input{flex:none;width:100%;border:none;border-bottom:none;outline:none;background:transparent;font-size:15px;font-family:inherit;line-height:1.5;color:#e0e0e0;resize:none;min-height:80px;max-height:200px;padding:16px 20px 0 20px;box-shadow:none;display:block}
#ai-input::placeholder{color:#555}
#ai-send-btn{flex-shrink:0;width:44px;height:44px;border-radius:14px;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s ease;background:rgba(255,255,255,0.06);color:rgba(255,255,255,0.2)}
#ai-send-btn.has-text{background:#4f6fbf;color:#fff;box-shadow:0 2px 8px rgba(79,111,191,0.3)}
#ai-send-btn.has-text:hover{background:#5b7fd4}
#ai-send-btn:disabled{background:rgba(255,255,255,0.06);color:rgba(255,255,255,0.15);box-shadow:none;cursor:not-allowed}
.ai-inline-btn#ai-stop-btn{width:36px;height:36px;padding:0;border-radius:10px;background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.06);color:#9ca3af;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s ease;flex-shrink:0}
.ai-inline-btn#ai-stop-btn:hover{background:rgba(255,255,255,0.12)}
/* 内联按钮（stop) */

.ai-upload-progress{display:flex;align-items:center;gap:8px;font-size:12px;color:rgba(255,255,255,0.4);padding:0 4px}
.ai-search-indicator{display:flex;align-items:center;gap:8px;font-size:13px;color:#6b7280;padding:6px 20px}

/* ===== Toast ===== */
.ai-toast{position:fixed;top:70px;left:50%;transform:translateX(-50%);background:rgba(0,0,0,0.85);color:#e0e0e0;font-size:13px;padding:8px 20px;border-radius:20px;z-index:500;opacity:0;transition:opacity .3s;pointer-events:none}
.ai-toast.show{opacity:1}

/* ===== 弹窗 ===== */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.6);z-index:400;display:flex;align-items:center;justify-content:center}
.modal-open{overflow:hidden}
.modal-card{background:#252540;border:1px solid rgba(255,255,255,0.08);border-radius:14px;padding:24px;max-width:400px;width:90%;box-shadow:0 20px 60px rgba(0,0,0,0.4)}
.modal-title{font-size:16px;font-weight:600;margin-bottom:12px;color:#e0e0e0}
.modal-body{font-size:14px;color:rgba(255,255,255,0.6);margin-bottom:20px;line-height:1.6}
.modal-buttons{display:flex;gap:10px;justify-content:flex-end}
.modal-btn{padding:8px 20px;border-radius:8px;border:none;font-size:13px;cursor:pointer;transition:all .2s}
.modal-btn-cancel{background:rgba(255,255,255,0.08);color:rgba(255,255,255,0.6)}
.modal-btn-cancel:hover{background:rgba(255,255,255,0.12)}
.modal-btn-confirm{background:#dc2626;color:#fff}
.modal-btn-confirm:hover{background:#ef4444}

/* ===== 工具提示 ===== */
.sidebar-tooltip{position:fixed;background:rgba(0,0,0,0.9);color:#e0e0e0;font-size:12px;padding:6px 10px;border-radius:6px;z-index:350;pointer-events:none;opacity:0;transform:translateY(-50%);transition:opacity .15s;white-space:nowrap}
.sidebar-tooltip.show{opacity:1}

/* ===== 深度思考块 ===== */
.ai-thinking-block{margin-bottom:4px}
.ai-thinking-header{cursor:pointer;font-size:12px;color:rgba(255,255,255,0.4);display:flex;align-items:center;gap:4px;padding:4px 0}
.ai-thinking-body{font-size:13px;color:rgba(255,255,255,0.45);border-left:2px solid rgba(255,255,255,0.1);padding-left:10px;margin:4px 0;display:block}
.ai-thinking-block.collapsed .ai-thinking-body{display:none}
.ai-thinking-block.collapsed .toggle-arrow{transform:rotate(-90deg)}
.toggle-arrow{transition:transform .2s;font-size:10px}
.ai-thinking-divider{height:1px;background:rgba(255,255,255,0.06);margin:8px 0}

/* ===== 浮动展开按钮（侧边栏折叠时可见） ===== */
.sidebar-float-btn{position:fixed;top:60px;left:8px;z-index:160;width:36px;height:36px;border-radius:10px;border:none;background:rgba(21,21,37,0.9);color:rgba(255,255,255,0.5);cursor:pointer;display:none;align-items:center;justify-content:center;backdrop-filter:blur(8px);box-shadow:0 2px 8px rgba(0,0,0,0.3);transition:all .2s}
.sidebar-float-btn:hover{background:rgba(79,111,191,0.5);color:#c7d2fe}
.sidebar-float-btn.show{display:flex}
/* 浮钮显示由 JS 控制，sidebar 展开时自动隐藏 */

/* 侧边栏折叠时，对话区占满宽度 */
.ai-sidebar.collapsed ~ .ai-page{margin-left:0}
.ai-sidebar.collapsed ~ .ai-input-bar{left:0}

/* ===== 滚动条美化 ===== */
.ai-messages::-webkit-scrollbar,
.ai-sidebar::-webkit-scrollbar{width:6px}
.ai-messages::-webkit-scrollbar-track,
.ai-sidebar::-webkit-scrollbar-track{background:transparent}
.ai-messages::-webkit-scrollbar-thumb,
.ai-sidebar::-webkit-scrollbar-thumb{background:#444;border-radius:3px}
.ai-messages::-webkit-scrollbar-thumb:hover,
.ai-sidebar::-webkit-scrollbar-thumb:hover{background:#666}
/* Firefox */
.ai-messages,.ai-sidebar{scrollbar-width:thin;scrollbar-color:#444 transparent}

/* 内联按钮（上传/搜索） */
.ai-inline-btn{flex-shrink:0;height:32px;border-radius:8px;border:none;background:#000;color:rgba(255,255,255,0.35);cursor:pointer;display:flex;align-items:center;gap:4px;padding:0 8px;font-size:12px;transition:all .2s ease}
.ai-inline-btn:hover{background:rgba(255,255,255,0.08);color:rgba(255,255,255,0.75)}
.ai-inline-btn.active{background:rgba(79,111,191,0.25);color:#c7d2fe}
.ai-inline-btn.loading{opacity:.5}

#ai-input:focus{outline:none}

.ai-tool-btn{display:flex;align-items:center;gap:4px;padding:5px 10px;border-radius:6px;border:none;background:#2a2a3a;color:#ccc;font-size:11px;cursor:pointer;transition:all .2s ease}
.ai-tool-btn:hover{background:#333}
.ai-tool-btn.active{background:#3a5a7a;color:#fff}
.ai-tool-btn.loading{opacity:.5}

.ai-input-right{display:flex;gap:8px;align-items:center}
.ai-input-left{display:flex;flex-direction:row;gap:8px;align-items:center}

.ai-toolbar{display:flex;justify-content:space-between;align-items:center;padding:8px 12px;background:transparent}