:root{--ink:#1f2521;--muted:#7d817c;--paper:#f6f5f1;--panel:#ebeae5;--line:#dcdcd5;--accent:#1e7658;--accent-dark:#14583f;--white:#fff;--danger:#a8483d;--shadow:0 20px 60px rgba(31,37,33,.12)}
*{box-sizing:border-box}html,body{margin:0;height:100%;font-family:'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;color:var(--ink);background:var(--paper)}button,input,textarea{font:inherit}button{color:inherit}.hidden{display:none!important}.eyebrow{letter-spacing:.18em;font-size:11px;font-weight:600;color:var(--accent);text-transform:uppercase}.brand-mark{width:38px;height:38px;border-radius:50% 50% 46% 54%;background:var(--accent);color:#fff;display:grid;place-items:center;font-family:'Songti SC','SimSun',serif;font-size:18px;box-shadow:inset -5px -4px 10px rgba(0,0,0,.12)}.brand-mark.large{width:58px;height:58px;font-size:25px;margin-bottom:25px}
.login-view{min-height:100%;display:grid;place-items:center;position:relative;overflow:hidden;background:linear-gradient(135deg,#f7f6f2 0%,#eceee8 100%)}.login-card{width:min(420px,calc(100% - 40px));padding:46px;background:rgba(255,255,255,.7);backdrop-filter:blur(18px);border:1px solid rgba(255,255,255,.9);box-shadow:var(--shadow);position:relative;z-index:2}.login-card h1{font-family:'Songti SC','SimSun',serif;font-size:35px;margin:6px 0}.login-subtitle{color:var(--muted);margin:0 0 34px}.login-card label{display:block;font-size:13px;font-weight:600;margin:18px 0 0}.login-card input,.create-user input{width:100%;border:0;border-bottom:1px solid #bfc3bc;background:transparent;padding:12px 0;outline:0;border-radius:0}.login-card input:focus,.create-user input:focus{border-color:var(--accent)}.primary-btn{border:0;background:var(--accent);color:white;padding:13px 16px;cursor:pointer;transition:.2s}.primary-btn:hover{background:var(--accent-dark)}.login-card .primary-btn{margin-top:30px;width:100%;display:flex;justify-content:space-between}.form-error{color:var(--danger);font-size:12px;min-height:18px}.security-note{text-align:center;font-size:11px;color:#999;margin:25px 0 0}.security-note span{color:var(--accent);font-size:7px}.login-decoration{position:absolute;width:650px;height:650px;right:-160px;bottom:-300px;border:1px solid rgba(30,118,88,.15);border-radius:50%}.login-decoration i{position:absolute;border:1px solid rgba(30,118,88,.12);border-radius:50%;inset:60px}.login-decoration i:nth-child(2){inset:130px}.login-decoration i:nth-child(3){inset:210px;background:rgba(30,118,88,.04)}
.app{height:100%;display:grid;grid-template-columns:280px 1fr}.sidebar{background:#e9e8e3;border-right:1px solid var(--line);display:flex;flex-direction:column;min-width:0;z-index:10}.sidebar-head{height:85px;padding:21px 22px;display:flex;gap:12px;align-items:center;border-bottom:1px solid var(--line)}.sidebar-head>div:nth-child(2){display:flex;flex-direction:column}.sidebar-head strong{font-family:'Noto Serif SC';font-size:17px}.sidebar-head small{font-size:10px;color:var(--muted);letter-spacing:.1em}.new-chat{margin:22px;border:1px solid #ced1ca;background:rgba(255,255,255,.45);height:46px;text-align:left;padding:0 14px;cursor:pointer;display:flex;align-items:center;gap:10px}.new-chat:hover{background:#fff}.new-chat span{font-size:20px;color:var(--accent)}.new-chat kbd{margin-left:auto;color:#999;font-size:9px;border:0;background:none}.history-label{font-size:10px;letter-spacing:.13em;color:#999;padding:0 24px 10px}.conversation-list{overflow:auto;padding:0 10px;flex:1}.conversation-item{display:flex;align-items:center;gap:8px;border:0;background:transparent;width:100%;padding:11px 12px;cursor:pointer;text-align:left;font-size:13px;color:#555}.conversation-item:hover,.conversation-item.active{background:rgba(255,255,255,.65);color:var(--ink)}.conversation-item .bubble{font-size:12px;color:#9da19b}.conversation-item .title{overflow:hidden;white-space:nowrap;text-overflow:ellipsis;flex:1}.conversation-item .remove{opacity:0;border:0;background:none;cursor:pointer;color:#999}.conversation-item:hover .remove{opacity:1}.sidebar-footer{padding:12px 16px 18px;border-top:1px solid var(--line)}.footer-action{border:0;background:transparent;width:100%;text-align:left;padding:10px 7px;color:#606560;cursor:pointer}.footer-action:hover{color:var(--accent)}.user-block{display:flex;align-items:center;gap:11px;padding:10px 7px}.avatar{width:34px;height:34px;background:#cbd9d0;border-radius:50%;display:grid;place-items:center;color:var(--accent-dark);font-weight:600}.user-info{display:flex;flex:1;min-width:0;flex-direction:column}.user-info strong{font-size:13px}.user-info small{font-size:10px;color:#999}.icon-btn{border:0;background:transparent;cursor:pointer;color:#767b75;font-size:18px;padding:5px}.icon-btn:hover{color:var(--accent)}
.workspace{min-width:0;height:100%;display:flex;flex-direction:column;background:var(--paper)}.topbar{height:64px;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 30px;justify-content:space-between}.status{font-size:11px;color:#6f756f;display:flex;align-items:center;gap:8px}.status i{width:6px;height:6px;background:#4b9e75;border-radius:50%;box-shadow:0 0 0 3px #dcebe3}.topbar-right{font-size:10px;letter-spacing:.1em;color:#999;display:flex;gap:13px;align-items:center}.divider{width:1px;height:12px;background:var(--line)}.chat-scroll{flex:1;overflow:auto;scroll-behavior:smooth}.welcome{max-width:850px;margin:0 auto;padding:10vh 40px 170px}.welcome h1{font-family:'Noto Serif SC';font-size:clamp(38px,4.2vw,64px);line-height:1.22;letter-spacing:-.04em;margin:15px 0 22px;font-weight:600}.welcome h1 em{font-style:normal;color:var(--accent)}.welcome-copy{color:var(--muted);line-height:1.8;font-size:14px}.suggestions{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:55px}.suggestions button{min-height:120px;text-align:left;background:transparent;border:1px solid var(--line);padding:17px;display:grid;grid-template-columns:27px 1fr;grid-template-rows:1fr 1fr;cursor:pointer;transition:.2s}.suggestions button:hover{background:#fff;border-color:#c8d1ca;transform:translateY(-2px);box-shadow:0 8px 25px rgba(40,50,42,.06)}.suggest-icon{grid-row:1/3;color:var(--accent);font-size:18px}.suggestions b{font-size:13px}.suggestions small{color:#999;font-size:10px}.composer-wrap{position:absolute;bottom:0;left:280px;right:0;padding:20px 30px 30px;background:linear-gradient(transparent,var(--paper) 25%)}.composer{max-width:800px;margin:0 auto;background:#fff;border:1px solid #d9dbd5;box-shadow:0 10px 35px rgba(34,45,37,.08);padding:16px 18px 11px}.composer:focus-within{border-color:#aabdb0;box-shadow:0 12px 40px rgba(30,118,88,.1)}.composer textarea{width:100%;border:0;resize:none;outline:0;min-height:27px;max-height:180px;line-height:1.6;color:var(--ink)}.composer textarea::placeholder{color:#a3a6a1}.composer-bottom{display:flex;align-items:center;gap:13px;margin-top:7px}.composer-bottom .ai-note{font-size:9px;color:#aaa;margin-left:auto}.composer-bottom button{border:0;background:var(--accent);color:#fff;width:31px;height:31px;cursor:pointer}.composer-bottom button:disabled{opacity:.45;cursor:not-allowed}.data-toggle{font-size:10px;color:#747a74;cursor:pointer;display:flex;align-items:center;gap:5px;user-select:none}.data-toggle input{position:absolute;opacity:0}.data-toggle span{color:#aaa}.data-toggle:has(input:checked){color:var(--accent)}.data-toggle:has(input:checked) span{color:var(--accent)}
.messages{max-width:850px;margin:0 auto;padding:45px 40px 180px}.message{display:grid;grid-template-columns:34px 1fr;gap:15px;margin-bottom:32px}.message .msg-avatar{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;font-size:11px;font-weight:600;background:#dfe1dc;color:#555}.message.assistant .msg-avatar{background:var(--accent);color:#fff;font-family:'Noto Serif SC'}.message-body{min-width:0}.message-meta{font-size:11px;font-weight:600;margin:6px 0 9px}.message-content{font-size:14px;line-height:1.85;word-break:break-word}.message-content p{margin:0 0 12px}.message-content h1,.message-content h2,.message-content h3{font-family:'Noto Serif SC';margin:22px 0 10px}.message-content h1{font-size:22px}.message-content h2{font-size:19px}.message-content h3{font-size:16px}.message-content pre{background:#242a26;color:#e8eee9;padding:15px;overflow:auto;font-size:12px;line-height:1.6}.message-content code{background:#e7e9e4;padding:2px 5px;font-size:.9em}.message-content pre code{background:none;padding:0}.message-content ul,.message-content ol{padding-left:20px}.typing:after{content:'▋';color:var(--accent);animation:blink .8s infinite}@keyframes blink{50%{opacity:0}}
.toast{position:fixed;top:20px;left:50%;transform:translate(-50%,-20px);opacity:0;z-index:100;background:#263029;color:#fff;padding:11px 18px;font-size:12px;pointer-events:none;transition:.25s}.toast.show{opacity:1;transform:translate(-50%,0)}.toast.error{background:var(--danger)}.backdrop{position:fixed;inset:0;background:rgba(24,31,26,.35);z-index:19}.modal{position:fixed;inset:0;z-index:20;display:grid;place-items:center;padding:20px}.modal-card{background:var(--paper);width:min(760px,100%);max-height:85vh;overflow:auto;box-shadow:var(--shadow);padding:30px}.modal-card>header{display:flex;justify-content:space-between;align-items:start}.modal-card h2{font-family:'Noto Serif SC';margin:5px 0 20px}.create-user{display:grid;grid-template-columns:1fr 1fr 1.4fr auto;gap:14px;background:#eaeae5;padding:16px;margin-bottom:20px}.user-list{border-top:1px solid var(--line)}.user-row{display:grid;grid-template-columns:1.4fr 1fr 90px 70px;align-items:center;padding:14px 5px;border-bottom:1px solid var(--line);font-size:12px}.user-row small{display:block;color:#999}.pill{font-size:9px;padding:3px 7px;background:#dbe9e0;color:var(--accent);justify-self:start}.switch{border:1px solid var(--line);background:transparent;font-size:10px;padding:5px;cursor:pointer}.mobile-only{display:none}
@media(max-width:760px){.app{grid-template-columns:1fr}.sidebar{position:fixed;inset:0 auto 0 0;width:min(84vw,300px);transform:translateX(-102%);transition:.25s;box-shadow:var(--shadow)}.sidebar.open{transform:none}.mobile-only{display:block}.sidebar-head .mobile-only{margin-left:auto}.topbar{padding:0 16px}.topbar-right>span:first-child,.divider{display:none}.welcome{padding:7vh 22px 170px}.welcome h1{font-size:39px}.welcome-copy br{display:none}.suggestions{grid-template-columns:1fr;margin-top:35px}.suggestions button{min-height:76px}.composer-wrap{left:0;padding:16px 14px 18px}.composer-bottom .ai-note{display:none}.messages{padding:30px 20px 150px}.create-user{grid-template-columns:1fr}.user-row{grid-template-columns:1.4fr 1fr 65px}.user-row>span:nth-child(3){display:none}}