*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#111;background:#f6f6f4}button,input{font:inherit}button{cursor:pointer}a{text-decoration:none;color:inherit}
:root{--black:#111;--muted:#747474;--line:#e8e8e5;--soft:#f7f7f5;--green:#25d366}
.app{min-height:100vh}.topbar{height:76px;background:rgba(255,255,255,.92);backdrop-filter:blur(18px);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 28px;position:sticky;top:0;z-index:10}
.brand{display:flex;align-items:center;gap:12px}.brand-mark{width:38px;height:38px;border-radius:12px;background:#111;color:#fff;display:grid;place-items:center;font-weight:900;font-size:18px;box-shadow:0 6px 18px #00000012}.brand strong{display:block;font-size:15px;letter-spacing:-.2px}.brand span{display:block;font-size:11px;color:#8a8a86;margin-top:2px}
.top-actions{display:flex;align-items:center;gap:10px}.live{font-size:12px;font-weight:700;color:#444;display:flex;gap:7px;align-items:center;margin-right:6px}.live i{width:7px;height:7px;background:var(--green);border-radius:50%;box-shadow:0 0 0 4px #25d36616}.icon-btn{width:38px;height:38px;border:1px solid var(--line);background:#fff;border-radius:11px;color:#555}.icon-btn:hover{background:#f4f4f2}.logout{font-size:12px;color:#777;padding:10px 12px;border-radius:10px}.logout:hover{background:#f1f1ef}
.layout{height:calc(100vh - 76px);display:grid;grid-template-columns:360px 1fr;max-width:1500px;margin:auto;background:#fff;border-left:1px solid var(--line);border-right:1px solid var(--line)}
.sidebar{border-right:1px solid var(--line);display:flex;flex-direction:column;min-width:0}.side-head{padding:25px 22px 17px}.eyebrow{font-size:10px;font-weight:800;letter-spacing:.16em;color:#999;margin-bottom:7px}.side-head h2{margin:0;font-size:26px;letter-spacing:-.8px}.side-head h2 span{font-size:11px;background:#111;color:#fff;padding:4px 7px;border-radius:99px;vertical-align:middle;margin-left:5px}.search-wrap{margin:0 18px 13px;height:42px;background:#f5f5f3;border:1px solid #ededeb;border-radius:12px;display:flex;align-items:center;padding:0 12px;gap:8px}.search-wrap span{font-size:20px;color:#999}.search-wrap input{border:0;outline:0;background:transparent;width:100%;font-size:13px}.filters{display:flex;padding:0 18px 12px;gap:7px}.filter{border:0;background:transparent;color:#888;padding:7px 9px;border-radius:8px;font-size:12px}.filter.active{background:#111;color:#fff}.filter b{margin-left:5px;font-size:10px;opacity:.75}.conversation-list{overflow:auto;padding:0 9px 20px}.conversation{width:100%;border:0;background:transparent;display:flex;gap:11px;text-align:left;padding:12px 10px;border-radius:13px;align-items:center}.conversation:hover{background:#f7f7f5}.conversation.selected{background:#f0f0ed}.avatar,.customer-avatar{flex:0 0 43px;width:43px;height:43px;border-radius:50%;background:#111;color:#fff;display:grid;place-items:center;font-size:12px;font-weight:800}.conv-body{min-width:0;flex:1}.conv-top,.conv-bottom{display:flex;align-items:center;justify-content:space-between;gap:10px}.conv-top strong{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.conv-top time{font-size:10px;color:#999;flex:none}.conv-bottom{margin-top:4px}.conv-bottom span{font-size:11px;color:#888;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.unread{background:#111;color:#fff;min-width:19px;height:19px;padding:0 5px;border-radius:99px;display:grid;place-items:center;font-size:9px}
.empty-list{padding:45px 25px;text-align:center;color:#999}.empty-list b{display:block;color:#555;font-size:12px;margin:9px 0 5px}.empty-list span{font-size:11px;line-height:1.5}.empty-icon{width:46px;height:46px;border-radius:14px;background:#f4f4f1;margin:auto;display:grid;place-items:center;font-size:22px}
.chat{min-width:0;background:#fafaf8;position:relative}.chat-empty{height:100%;display:grid;place-items:center;align-content:center;text-align:center;padding:30px}.empty-hero{width:66px;height:66px;border-radius:20px;background:#111;color:#fff;display:grid;place-items:center;font-size:28px;font-weight:900;margin-bottom:18px;box-shadow:0 15px 35px #00000015}.chat-empty h2{margin:0 0 8px;font-size:21px;letter-spacing:-.5px}.chat-empty p{margin:0;color:#999;font-size:12px}.hidden{display:none!important}.chat-view{height:100%;display:flex;flex-direction:column}.chat-head{height:78px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 24px;gap:12px}.customer-meta{min-width:0;flex:1}.customer-meta h2{font-size:15px;margin:0 0 3px}.customer-meta span{font-size:11px;color:#999}.chat-head-actions{display:flex;gap:7px}
.messages{flex:1;overflow:auto;padding:30px 9%;background:radial-gradient(circle at 50% 0,#fff 0,#fafaf8 45%)}.msg-row{display:flex;margin:7px 0}.bubble{max-width:min(680px,80%);background:#fff;border:1px solid #ecece8;border-radius:17px 17px 17px 5px;padding:12px 14px;box-shadow:0 4px 16px #00000006}.bubble-text{font-size:13px;line-height:1.55;color:#202020;word-break:break-word}.bubble-time{font-size:9px;color:#aaa;text-align:right;margin-top:7px}.no-messages{margin:auto;color:#999;font-size:12px}.chat-foot{height:47px;background:#fff;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:center;gap:10px;font-size:10px;color:#aaa}.lock{font-weight:700;color:#777}
.login-page{min-height:100vh;display:grid;place-items:center;background:#f5f5f2}.login-shell{width:min(430px,calc(100% - 32px))}.login-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:34px;box-shadow:0 25px 70px #0000000d}.login-icon{width:54px;height:54px;border-radius:17px;background:#111;color:#fff;display:grid;place-items:center;font-size:25px;margin:36px 0 20px}.login-card h1{font-size:28px;letter-spacing:-1px;margin:0 0 8px}.login-card p{font-size:12px;color:#888;margin:0 0 25px;line-height:1.5}.login-card label{font-size:11px;font-weight:800;display:block;margin-bottom:7px}.login-card input{width:100%;height:46px;border:1px solid #ddd;border-radius:12px;padding:0 13px;outline:none;margin-bottom:12px}.login-card input:focus{border-color:#111;box-shadow:0 0 0 3px #1111110b}.primary{height:46px;border:0;border-radius:12px;background:#111;color:#fff;font-weight:800;padding:0 17px}.primary span{margin-left:10px}.wide{width:100%}
@media(max-width:850px){.layout{grid-template-columns:1fr;height:auto;min-height:calc(100vh - 76px)}.sidebar{height:48vh;border-right:0;border-bottom:1px solid var(--line)}.chat{height:52vh}.messages{padding:22px 5%}.topbar{padding:0 16px}.live{display:none}.chat-foot{font-size:9px}.chat-head{padding:0 15px}}
@media(max-width:520px){.topbar{height:68px}.layout{min-height:calc(100vh - 68px)}.sidebar{height:45vh}.chat{height:55vh}.side-head{padding:18px 17px 12px}.side-head h2{font-size:22px}.search-wrap{margin:0 13px 10px}.conversation-list{padding:0 5px}.chat-head{height:68px}.customer-avatar{width:38px;height:38px;flex-basis:38px}.bubble{max-width:88%}}