:root{--bg:#07101f;--panel:#0d182a;--panel2:#111f34;--line:#20324d;--text:#edf4ff;--muted:#8fa4c2;--accent:#57a8ff;--accent2:#7f6bff;--good:#4ad7a8;--warn:#ffbd5b;--bad:#ff6b7d;--shadow:0 24px 80px rgba(0,0,0,.38)}*{box-sizing:border-box}html,body{margin:0;height:100%;font-family:Inter,"PingFang SC","Microsoft YaHei",sans-serif;background:radial-gradient(circle at 15% 10%,#132b51 0,transparent 32%),var(--bg);color:var(--text)}button,input,textarea,select{font:inherit}button{cursor:pointer}.hidden{display:none!important}.muted{color:var(--muted)}.center{text-align:center}.wide{width:100%}.primary{border:0;color:#fff;background:linear-gradient(135deg,var(--accent),var(--accent2));border-radius:12px;padding:13px 18px;font-weight:700;box-shadow:0 10px 30px rgba(72,127,255,.25)}.ghost{border:1px solid var(--line);background:#0b1627;color:var(--text);border-radius:10px;padding:10px}.auth-shell{min-height:100%;display:grid;grid-template-columns:1.2fr 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rgba(255,255,255,.1);border-radius:24px;padding:28px;box-shadow:var(--shadow);backdrop-filter:blur(20px)}.tabs{display:flex;background:#081322;border-radius:12px;padding:4px;margin-bottom:24px}.tab{flex:1;border:0;background:transparent;color:var(--muted);padding:10px;border-radius:9px}.tab.active{background:#162844;color:#fff}.auth-form{display:grid;gap:16px}.auth-form label{font-size:13px;color:#bed0e6;display:grid;gap:8px}.auth-form input,.auth-form select{width:100%;border:1px solid var(--line);background:#091525;color:var(--text);border-radius:11px;padding:12px;outline:none}.auth-form input:focus,.auth-form select:focus{border-color:var(--accent)}.auth-form p{font-size:12px;margin:0}.app-shell{height:100%;display:grid;grid-template-columns:280px 1fr}.sidebar{background:rgba(7,16,31,.95);border-right:1px solid var(--line);padding:18px 14px;display:flex;flex-direction:column;min-height:0}.side-head{display:flex;align-items:center;gap:10px;padding:4px 8px 18px}.mini-logo{width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,var(--accent),var(--accent2));display:grid;place-items:center;font-weight:900}.side-head b,.side-head span{display:block}.side-head span{font-size:11px;color:var(--muted);margin-top:3px}.new-chat{border:1px solid #335581;background:linear-gradient(135deg,rgba(87,168,255,.18),rgba(127,107,255,.16));color:#fff;border-radius:12px;padding:12px;text-align:left}.side-label{font-size:11px;color:#687e9d;text-transform:uppercase;letter-spacing:1px;margin:24px 9px 9px}.conversation-list{overflow:auto;display:grid;gap:4px;min-height:0}.conv-item{display:flex;align-items:center;gap:8px;border-radius:9px;padding:9px 10px;color:#b7c7db;font-size:13px}.conv-item:hover,.conv-item.active{background:#13243b;color:#fff}.conv-item span{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.conv-item button{opacity:0;border:0;background:transparent;color:#8ca1bc}.conv-item:hover button{opacity:1}.side-foot{margin-top:auto;display:grid;gap:8px;padding-top:16px}.usage-mini{padding:12px;background:#0c192a;border:1px solid var(--line);border-radius:12px}.usage-mini span,.usage-mini b{display:block;font-size:11px}.usage-mini b{margin:6px 0 8px;color:#d6e6fa}.usage-mini>div{height:5px;background:#1b2b42;border-radius:10px;overflow:hidden}.usage-mini i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--accent2))}.chat-main{display:flex;flex-direction:column;min-width:0;min-height:0}.topbar{height:72px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 26px;background:rgba(8,18,33,.78);backdrop-filter:blur(14px)}.topbar h2{font-size:16px;margin:0 0 5px}.topbar>div>span{font-size:11px;color:var(--muted)}.top-actions{display:flex;align-items:center;gap:18px}.search-toggle{display:flex;align-items:center;gap:8px;font-size:13px;color:#b9c9de}.search-toggle input{display:none}.search-toggle span{width:38px;height:21px;background:#24354d;border-radius:20px;position:relative;transition:.2s}.search-toggle span:after{content:"";width:15px;height:15px;position:absolute;left:3px;top:3px;background:#fff;border-radius:50%;transition:.2s}.search-toggle input:checked+span{background:var(--accent)}.search-toggle input:checked+span:after{left:20px}.user-badge{height:38px;min-width:38px;padding:0 11px;border-radius:12px;background:#14243b;border:1px solid var(--line);display:flex;align-items:center;gap:9px;font-size:12px}.messages{flex:1;overflow:auto;padding:34px max(24px,calc((100% - 860px)/2));scroll-behavior:smooth}.welcome{text-align:center;padding-top:11vh}.welcome-icon{font-size:35px;color:#7fbaff}.welcome h2{font-size:30px;margin:14px}.welcome p{color:var(--muted)}.prompt-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:35px}.prompt-cards button{border:1px solid var(--line);background:#0d1a2d;color:#bdd0e7;border-radius:14px;padding:17px;text-align:left}.prompt-cards button:hover{border-color:#3e6fa8;background:#12223a}.message{display:grid;grid-template-columns:34px 1fr;gap:13px;margin-bottom:25px}.avatar{width:34px;height:34px;border-radius:11px;display:grid;place-items:center;font-size:12px;font-weight:800}.message.user .avatar{background:#20304a}.message.assistant .avatar{background:linear-gradient(135deg,var(--accent),var(--accent2))}.bubble{min-width:0}.message.user .bubble{background:#13243a;border:1px solid var(--line);border-radius:16px;padding:13px 15px}.bubble-content{line-height:1.75;font-size:14px;white-space:pre-wrap;word-break:break-word}.bubble-content code{background:#06101d;padding:2px 5px;border-radius:5px}.bubble-content pre{background:#050d18;border:1px solid #1c2e47;padding:14px;border-radius:12px;overflow:auto;white-space:pre}.source-box{margin-top:13px;border-top:1px solid var(--line);padding-top:10px}.source-box b{font-size:12px}.source-box a{display:block;color:#78b8ff;font-size:12px;margin-top:7px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tag{display:inline-block;font-size:10px;color:#bfe0ff;background:#153455;border:1px solid #2a5b88;border-radius:20px;padding:3px 7px;margin-bottom:7px}.typing{color:var(--muted);animation:pulse 1s infinite}@keyframes pulse{50%{opacity:.45}}.composer-wrap{padding:12px max(24px,calc((100% - 860px)/2)) 18px;background:linear-gradient(transparent,rgba(7,16,31,.98) 30%)}.composer{display:flex;align-items:flex-end;gap:10px;background:#101e32;border:1px solid #2a4261;border-radius:17px;padding:10px 10px 10px 15px;box-shadow:0 15px 45px rgba(0,0,0,.24)}.composer:focus-within{border-color:#4e8fd0}.composer textarea{resize:none;max-height:180px;flex:1;border:0;background:transparent;color:#fff;outline:none;line-height:1.6;padding:6px 0}.send-btn{border:0;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;border-radius:11px;padding:10px 17px;font-weight:700}.send-btn:disabled{opacity:.5}.composer-note{text-align:center;font-size:10px;color:#687e99;margin-top:8px}.toast{position:fixed;right:24px;top:24px;background:#15263d;border:1px solid #315171;color:#fff;padding:12px 16px;border-radius:11px;z-index:1000;opacity:0;transform:translateY(-10px);pointer-events:none;transition:.2s}.toast.show{opacity:1;transform:none}.toast.error{border-color:#8b3f4d;background:#391b24}.modal{position:fixed;inset:0;background:rgba(1,6,14,.72);display:grid;place-items:center;z-index:900;padding:24px}.modal-card{background:#0b1728;border:1px solid #2a3f5b;border-radius:20px;box-shadow:var(--shadow)}.admin-card{width:min(1040px,96vw);height:min(760px,92vh);display:flex;flex-direction:column}.modal-head{padding:20px 23px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between}.modal-head h2{margin:0}.modal-head p{margin:6px 0 0;color:var(--muted);font-size:12px}.icon-btn{border:0;background:#13243a;color:#fff;width:36px;height:36px;border-radius:10px;font-size:22px}.admin-tabs{display:flex;gap:5px;padding:12px 20px;border-bottom:1px solid var(--line)}.admin-tabs button{border:0;background:transparent;color:var(--muted);padding:8px 13px;border-radius:9px}.admin-tabs button.active{background:#172941;color:#fff}.admin-content{padding:22px;overflow:auto}.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.stat{padding:20px;border:1px solid var(--line);border-radius:15px;background:#101e31}.stat span{color:var(--muted);font-size:12px}.stat b{display:block;font-size:26px;margin-top:9px}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:14px}table{width:100%;border-collapse:collapse;font-size:12px}th,td{padding:12px;border-bottom:1px solid var(--line);text-align:left;white-space:nowrap}th{color:#8fa7c5;background:#0e1c2e}td input,td 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@media(max-width:800px){.auth-shell{grid-template-columns:1fr;padding:24px}.auth-brand{display:none}.app-shell{grid-template-columns:1fr}.sidebar{position:fixed;z-index:40;left:-290px;width:280px;height:100%;transition:.2s}.topbar{padding:0 15px}.messages,.composer-wrap{padding-left:15px;padding-right:15px}.prompt-cards{grid-template-columns:1fr}.stat-grid{grid-template-columns:repeat(2,1fr)}.user-badge{display:none}}