:root{color-scheme:light;--blue:#265bea;--ink:#192336;--muted:#6c788c;--line:#e5e9f0;--surface:#f4f6fa;font-family:"Pretendard","Malgun Gothic",system-ui,sans-serif;font-size:16px;color:var(--ink);background:var(--surface)}*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button{cursor:pointer;border:0;background:none;color:inherit}button:disabled{opacity:.45;cursor:wait}button:focus-visible,a:focus-visible{outline:3px solid #94b3ff;outline-offset:3px}.hidden{display:none!important}h1,h2,h3,p{margin:0}h1{font-size:1.7rem;letter-spacing:-.04em}h2{font-size:1.2rem}h3{font-size:1rem;margin-top:1rem}input,textarea{outline:none}input:focus,textarea:focus{border-color:var(--blue)}input{display:block;width:100%;padding:.85rem 1rem;border:1px solid #dce2ed;border-radius:12px;margin-top:.5rem;background:#fff}label{font-size:.9rem;display:block;margin:1.1rem 0}p{line-height:1.65}.subtle{color:var(--muted);font-size:.875rem}.primary{background:var(--blue);color:white;padding:.85rem 1.25rem;border-radius:12px;font-weight:600}.outline{border:1px solid var(--line);background:white;padding:.6rem 1rem;border-radius:10px;font-size:.875rem}.text-button{font-size:.875rem;padding:.6rem .3rem;color:var(--blue)}.error{font-size:.875rem;color:#bf3333;min-height:1rem;margin:.5rem 0}.auth{min-height:100dvh;display:grid;place-items:center;padding:2rem}.auth-card{width:min(100%,400px);padding:2rem;background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:0 16px 60px #1828460a}.logo{width:58px;height:58px;margin-bottom:1rem}.auth-card h1{font-size:2rem}.auth-card>p{color:var(--muted);margin:.6rem 0 1.5rem}.auth-card .primary{width:100%}.auth-card>.text-button{display:block;margin:1rem auto}.auth-card #invite-note{font-size:.875rem;margin-bottom:0}.rail{width:86px;background:#fff;border-right:1px solid var(--line);display:flex;align-items:center;flex-direction:column;padding:30px 12px;gap:28px}.brand{width:43px;height:43px}.rail-button{display:flex;align-items:center;flex-direction:column;gap:8px;width:60px;padding:12px 6px;border-radius:14px;color:var(--muted);font-size:.875rem}.rail-button.active{background:#eef3ff;color:var(--blue)}.glyph{font-size:1.6rem}.rail-bottom{margin-top:auto;display:flex;align-items:center;flex-direction:column;gap:24px}.avatar{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:14px;background:#e8efff;color:var(--blue);font-weight:700;flex-shrink:0}main{height:100dvh;display:flex;padding:0}.conversation-list{width:330px;background:#fff;display:flex;flex-direction:column;border-right:1px solid var(--line)}.list-header{display:flex;align-items:center;justify-content:space-between;padding:33px 26px 22px}.eyebrow{display:block;font-size:.75rem;color:var(--muted);margin-bottom:8px}.icon-button{display:grid;place-items:center;width:38px;height:38px;border-radius:10px;color:var(--muted);font-size:1.65rem;flex-shrink:0}.icon-button:hover{background:#eef2f9}.invite-button{display:flex;justify-content:space-between;align-items:center;margin:0 22px 22px;background:#f4f7ff;color:var(--blue);padding:13px 15px;border:1px dashed #c6d4fa;border-radius:12px;font-size:.875rem}.invite-button span{font-size:1.2rem}.rooms{overflow:auto;flex:1;padding:0 12px}.room-item{width:100%;display:flex;gap:12px;text-align:left;padding:16px 12px;border-radius:14px;margin-bottom:3px;align-items:center}.room-item.selected{background:#edf2ff}.room-item:hover{background:#f3f5fa}.room-item.selected:hover{background:#edf2ff}.room-text{flex:1;min-width:0}.room-top{display:flex;gap:8px;align-items:center;justify-content:space-between}.room-top strong{font-size:.94rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.room-top time{font-size:.75rem;color:#8490a2;white-space:nowrap}.room-preview{font-size:.875rem;margin-top:6px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.room-item .avatar{width:46px;height:46px;border-radius:16px}.list-footer{padding:20px 25px;font-size:.75rem;color:#8a94a4;display:flex;justify-content:space-between;border-top:1px solid var(--line)}.connection{font-size:.75rem}.chat{flex:1;min-width:0;position:relative;display:flex;flex-direction:column}.empty{height:100%;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:12px;padding:25px;text-align:center}.empty-mark{font-family:Georgia,serif;color:var(--blue);font-size:6rem;line-height:.85}.empty p{font-size:.94rem;color:var(--muted);margin-bottom:12px}#chat-content{height:100%;display:flex;flex-direction:column}.chat-header{height:94px;display:flex;align-items:center;gap:14px;padding:20px 30px;background:#fff;border-bottom:1px solid var(--line);flex-shrink:0}.chat-header .outline{margin-left:auto}.chat-header h2{margin-bottom:5px}.messages{flex:1;overflow-y:auto;padding:32px max(24px,calc((100% - 800px)/2));scroll-behavior:smooth}.date-divider{text-align:center;color:#8a94a4;font-size:.75rem;padding:0 0 25px}.message-row{display:flex;gap:10px;margin-bottom:23px;align-items:flex-start}.message-row.mine{flex-direction:row-reverse}.message-row .avatar{width:32px;height:32px;font-size:.875rem;border-radius:11px;margin-top:3px}.message-body{max-width:min(80%,580px)}.sender{color:var(--muted);font-size:.75rem;margin-bottom:7px}.bubble{background:white;border:1px solid var(--line);padding:12px 16px;border-radius:3px 17px 17px 17px;line-height:1.65;white-space:pre-wrap;overflow-wrap:anywhere;font-size:1rem}.mine .bubble{background:var(--blue);color:white;border-color:var(--blue);border-radius:17px 3px 17px 17px}.message-time{display:block;margin-top:5px;font-size:.75rem;color:#8a94a4}.mine .message-time{text-align:right}.file-preview img,.file-preview video{display:block;max-width:100%;max-height:320px;border-radius:10px;margin-bottom:10px}.file-preview a{color:inherit;display:block;font-size:.875rem;overflow-wrap:anywhere}.file-preview small{display:block;opacity:.7;font-size:.75rem}.composer{margin:0 25px 18px;padding:12px 16px;background:#fff;border:1px solid var(--line);border-radius:17px;box-shadow:0 4px 18px #20334c05;flex-shrink:0}.composer-row{display:flex;gap:8px;align-items:center}.composer textarea{flex:1;border:0;background:none;resize:none;max-height:150px;min-height:38px;padding:8px 2px;line-height:1.5;min-width:0}.send-button{width:40px;height:40px;background:var(--blue);color:#fff;border-radius:12px;font-size:1.5rem}.composer-caption{display:flex;justify-content:space-between;color:#929caf;font-size:.75rem;padding:10px 4px 0}.attachment{font-size:.875rem;padding:8px;background:#f2f5fb;border-radius:8px;margin-bottom:8px;display:flex;justify-content:space-between;gap:10px}.mobile{display:none}dialog{border:1px solid var(--line);border-radius:20px;padding:26px;max-width:470px;width:calc(100% - 32px);color:var(--ink);box-shadow:0 20px 100px #172c4d33}dialog::backdrop{background:#19233666;backdrop-filter:blur(3px)}.dialog-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}dialog>.primary,dialog form>.primary{width:100%;margin-top:12px}.people{max-height:220px;overflow:auto}.person{display:flex;align-items:center;gap:12px;padding:10px;background:#f5f7fb;border-radius:10px}.person input{width:18px;margin:0;accent-color:var(--blue)}.account{display:flex;gap:12px;align-items:center;margin:20px 0 25px}.button-row{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}.install-guide{font-size:.875rem;background:#f1f5ff;padding:14px;border-radius:12px;margin-top:15px;color:#476087}hr{border:0;border-top:1px solid var(--line);margin:24px 0}.danger{color:#bf3333}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:#192336;color:white;padding:12px 20px;border-radius:12px;max-width:calc(100% - 30px);z-index:20;font-size:.875rem;box-shadow:0 6px 30px #19233620}.room-empty{padding:35px 15px;text-align:center;font-size:.875rem;color:var(--muted)}
@media(min-width:1400px){main{max-width:1600px;margin:auto;border-left:1px solid var(--line);border-right:1px solid var(--line)}}@media(max-width:760px){.rail{width:66px;padding:22px 7px}.rail-button{width:50px}.conversation-list{width:calc(100% - 66px)}.chat{display:none}.room-open .rail,.room-open .conversation-list{display:none}.room-open .chat{display:flex;width:100%}.mobile{display:grid}.chat-header{height:78px;padding:12px 15px;gap:10px}.messages{padding:24px 14px}.composer{margin:0 10px calc(10px + env(safe-area-inset-bottom));padding:9px}.composer-caption span:last-child{display:none}.chat-header h2{font-size:1.05rem}.message-body{max-width:82%}.bubble{padding:10px 13px}.room-avatar{width:34px;height:34px}.list-header{padding:28px 20px 20px}main{height:100dvh}.auth{padding:18px}.auth-card{padding:24px}.empty{padding:20px}dialog{max-height:90dvh;overflow:auto}}