:root{--ink:#17252b;--muted:#728086;--line:#e3e9eb;--bg:#f4f7f8;--panel:#fff;--accent:#159a7c;--accent-dark:#087b63;--danger:#c94e4e;--shadow:0 18px 50px rgba(18,42,46,.09)}*{box-sizing:border-box}body{margin:0;font-family:Inter,"PingFang SC","Microsoft Yahei",sans-serif;color:var(--ink);background:var(--bg)}button,input,textarea{font:inherit}button{cursor:pointer}.hidden{display:none!important}.auth-view{min-height:100dvh;display:grid;place-items:center;padding:24px;background:linear-gradient(135deg,#e7f4ef,#f4f7f8 55%,#eaf0f4)}.brand{display:flex;gap:14px;align-items:center;margin-bottom:24px}.brand-mark{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;background:var(--accent);color:#fff;font-weight:800;font-size:26px;box-shadow:0 10px 26px rgba(21,154,124,.25)}h1,h2,h3,p{margin:0}.brand h1{font-size:26px}.brand p{color:var(--muted);font-size:13px;margin-top:4px}.auth-card{width:min(100%,420px);background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:var(--shadow)}.segmented{display:grid;grid-template-columns:1fr 1fr;background:#f2f5f5;padding:4px;border-radius:10px;margin-bottom:20px}.segmented button{border:0;background:transparent;padding:10px;border-radius:8px;color:var(--muted)}.segmented button.active{background:#fff;color:var(--ink);box-shadow:0 2px 10px rgba(0,0,0,.08);font-weight:700}label{display:block;color:var(--muted);font-size:13px;margin:13px 0 0}input,textarea{width:100%;border:1px solid var(--line);border-radius:9px;padding:11px 12px;background:#fbfcfc;color:var(--ink);outline:none;margin-top:7px}input:focus,textarea:focus{border-color:var(--accent)}.primary{width:100%;margin-top:20px;border:0;border-radius:10px;padding:12px 14px;background:var(--accent);color:#fff;font-weight:700;display:flex;justify-content:space-between}.error{min-height:18px;color:var(--danger);font-size:13px;margin-top:10px}.hint{font-size:11px;color:var(--muted);line-height:1.5;margin-top:17px}.main-view{min-height:100dvh;max-width:900px;margin:auto;background:var(--panel);display:flex;flex-direction:column}.topbar{height:78px;padding:18px 22px 12px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}.eyebrow{font-size:10px;letter-spacing:.14em;color:var(--accent);font-weight:800}.topbar h2{font-size:22px;margin-top:3px}.top-actions{display:flex;gap:6px}.icon-btn{border:0;background:#f1f5f4;color:var(--ink);width:38px;height:38px;border-radius:10px;font-size:19px}.content{flex:1;overflow:auto;padding:16px 18px 92px}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:min(100%,900px);height:72px;background:rgba(255,255,255,.96);border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(4,1fr);padding-bottom:env(safe-area-inset-bottom);z-index:5}.bottom-nav button{border:0;background:transparent;color:var(--muted);font-size:11px;display:grid;place-content:center;gap:4px}.bottom-nav button span{font-size:21px;line-height:1}.bottom-nav button.active{color:var(--accent);font-weight:700}.section-title{display:flex;justify-content:space-between;align-items:center;margin:7px 0 12px}.section-title h3{font-size:15px}.section-title button,.link-btn{border:0;background:transparent;color:var(--accent);font-size:13px}.search{margin-bottom:14px}.list{display:grid;gap:7px}.item{display:flex;align-items:center;gap:12px;border:1px solid var(--line);border-radius:12px;padding:12px;background:#fff;text-align:left;width:100%}.item:hover{border-color:#b7d8d0}.avatar{width:42px;height:42px;border-radius:13px;background:#dff1ec;color:var(--accent-dark);display:grid;place-items:center;font-weight:800;flex:none}.item-main{min-width:0;flex:1}.item-main strong,.item-main small{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.item-main small{color:var(--muted);font-size:12px;margin-top:4px}.badge{background:#e5f6f0;color:var(--accent-dark);border-radius:99px;padding:2px 7px;font-size:11px}.empty{text-align:center;padding:50px 20px;color:var(--muted)}.empty strong{display:block;color:var(--ink);margin-bottom:7px}.chat-shell{height:calc(100dvh - 170px);display:flex;flex-direction:column}.chat-head{display:flex;align-items:center;gap:11px;padding:6px 0 13px;border-bottom:1px solid var(--line)}.chat-head button{margin-left:auto;border:0;background:#eef6f3;color:var(--accent-dark);border-radius:9px;padding:8px 10px}.messages{flex:1;overflow:auto;padding:15px 2px;display:grid;align-content:start;gap:10px}.bubble-row{display:flex;gap:8px;align-items:flex-end}.bubble-row.mine{justify-content:flex-end}.bubble{max-width:min(76%,480px);padding:10px 12px;border-radius:13px;background:#f0f3f3;line-height:1.5;font-size:14px;white-space:pre-wrap;word-break:break-word;position:relative}.mine .bubble{background:#cfeee5}.bubble.local-only{opacity:.68;border:1px dashed #b5bfc0}.bubble small{display:block;color:var(--muted);font-size:10px;margin-top:4px}.bubble img{max-width:220px;border-radius:9px;display:block}.composer{border-top:1px solid var(--line);padding:10px 0 0;display:flex;gap:7px;align-items:flex-end}.composer textarea{margin:0;resize:none;min-height:42px;max-height:110px}.compose-actions{display:flex;gap:5px}.compose-actions button,.file-label{border:0;background:#eef3f2;border-radius:9px;width:40px;height:40px;display:grid;place-items:center;color:var(--accent-dark);font-size:18px}.send{background:var(--accent)!important;color:#fff!important}.about{line-height:1.7;color:#56666b;font-size:14px}.about h3{color:var(--ink);font-size:16px;margin:18px 0 5px}.profile{display:flex;align-items:center;gap:12px;padding:9px 0 18px}.profile .avatar{width:56px;height:56px;font-size:20px}.setting{width:100%;display:flex;justify-content:space-between;align-items:center;border:0;border-top:1px solid var(--line);background:#fff;padding:15px 0;text-align:left}.setting span{color:var(--muted);font-size:13px}.toast{position:fixed;bottom:90px;left:50%;transform:translate(-50%,12px);opacity:0;background:#203137;color:#fff;padding:9px 13px;border-radius:8px;font-size:13px;transition:.2s;z-index:20}.toast.show{opacity:1;transform:translate(-50%,0)}dialog{border:0;border-radius:14px;padding:0;width:min(92vw,430px);box-shadow:var(--shadow)}dialog::backdrop{background:rgba(11,25,28,.4)}.modal{padding:22px}.modal h3{margin-bottom:15px}.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:18px}.modal-actions button{border:0;border-radius:8px;padding:9px 13px}.modal-actions .ok{background:var(--accent);color:#fff}@media(min-width:720px){.main-view{margin:14px auto;min-height:calc(100dvh - 28px);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);overflow:hidden}.bottom-nav{position:absolute;bottom:14px;border-radius:0 0 16px 16px}}