:root{--bg:#eef0f4;--surface:#fff;--ink:#14213d;--navy:#14213d;--blue:#2f6bff;--blue-dark:#1f56e8;--blue-bg:#e8efff;--sub:#66718c;--sub2:#8b94ab;--line:#e3e7f0;--ok:#157347;--ok-bg:#e8f7ee;--bad:#dc2626;--bad-bg:#fdecec;--warn:#8a6116;--warn-bg:#fff8eb;
--shadow-card:0 14px 32px -24px rgba(20,33,61,.18),0 1px 3px rgba(20,33,61,.04);--shadow-float:0 24px 48px -22px rgba(20,33,61,.18),0 2px 8px rgba(20,33,61,.05);--grad-blue:linear-gradient(180deg,#4a80ff,#2f63f0);--grad-navy:linear-gradient(180deg,#1d2e5c,#14213d)}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{font-family:-apple-system,"Apple SD Gothic Neo","Noto Sans KR",sans-serif;background:radial-gradient(140% 90% at 50% -20%,#f8fafd 0%,var(--bg) 65%) fixed,var(--bg);color:var(--ink);line-height:1.5;word-break:keep-all;-webkit-font-smoothing:antialiased}
button,input,textarea{font:inherit}
a{color:var(--blue)}
.app{min-height:100%;display:flex;flex-direction:column}
.screen{flex:1;display:flex;flex-direction:column;max-width:640px;width:100%;margin:0 auto;padding:16px 16px calc(16px + env(safe-area-inset-bottom))}
.screen.wide{max-width:720px}
.card{background:var(--surface);border-radius:20px;padding:22px 20px;box-shadow:var(--shadow-card)}
.card.center{text-align:center;margin-top:12vh}
h1{font-size:24px;font-weight:900;letter-spacing:-.02em;margin:0 0 6px}
h2{font-size:17px;font-weight:800;margin:0 0 8px}
.sub{color:var(--sub);font-size:14px;margin:0}
.hint{color:var(--sub2);font-size:12.5px;margin:6px 0 0}
.eyebrow{font-size:12px;font-weight:700;color:var(--blue);letter-spacing:.06em}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:11px 18px;border:0;border-radius:14px;font-weight:800;cursor:pointer;background:var(--blue-bg);color:var(--blue);text-decoration:none}
.btn.primary{background:var(--grad-blue);color:#fff;box-shadow:0 14px 24px -12px rgba(47,99,240,.55),inset 0 1px 0 rgba(255,255,255,.22)}
.btn.primary:active{transform:translateY(1px)}
.btn.ghost{background:transparent;color:var(--sub)}
.btn.danger{background:var(--bad-bg);color:var(--bad)}
.btn.block{width:100%}
.btn[disabled]{opacity:.55;cursor:default}
.field{display:flex;flex-direction:column;gap:6px;margin:12px 0}
.field label{font-size:13px;font-weight:700;color:var(--sub)}
.input{width:100%;min-height:46px;padding:11px 14px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);font-size:16px}
.input:focus{outline:2px solid var(--blue);outline-offset:0;border-color:transparent}
.row{display:flex;gap:10px;align-items:center}
.row.between{justify-content:space-between}
.stack{display:flex;flex-direction:column;gap:12px}
.pill{display:inline-block;border-radius:999px;padding:3px 10px;font-size:12px;font-weight:700;background:var(--blue-bg);color:var(--blue)}
.pill.ok{background:var(--ok-bg);color:var(--ok)}.pill.bad{background:var(--bad-bg);color:var(--bad)}.pill.warn{background:var(--warn-bg);color:var(--warn)}.pill.navy{background:var(--navy);color:#fff}
.alert{border-radius:14px;padding:12px 14px;font-size:14px}
.alert.bad{background:var(--bad-bg);color:var(--bad)}.alert.warn{background:var(--warn-bg);color:var(--warn)}.alert.ok{background:var(--ok-bg);color:var(--ok)}
.topbar{display:flex;align-items:center;gap:10px;padding:6px 0 14px}
.topbar h1{font-size:20px;flex:1;margin:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.iconbtn{width:42px;height:42px;border-radius:12px;border:0;background:var(--surface);box-shadow:var(--shadow-card);cursor:pointer;font-size:18px;color:var(--ink);display:grid;place-items:center}
.list{display:flex;flex-direction:column;gap:10px}
.roomitem{display:flex;gap:12px;align-items:center;background:var(--surface);border-radius:18px;padding:14px 16px;box-shadow:var(--shadow-card);cursor:pointer;border:0;text-align:left;width:100%;color:var(--ink)}
.roomitem .av{width:44px;height:44px;border-radius:14px;background:var(--grad-navy);color:#fff;display:grid;place-items:center;font-weight:900;font-size:16px;flex:none}
.roomitem .av.hq{background:var(--grad-blue)}
.roomitem .body{flex:1;min-width:0}
.roomitem .name{font-weight:800;font-size:15px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.roomitem .meta{font-size:12.5px;color:var(--sub2);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.badge{min-width:22px;height:22px;border-radius:999px;background:var(--blue);color:#fff;font-size:12px;font-weight:800;display:grid;place-items:center;padding:0 6px}
.empty{text-align:center;color:var(--sub);padding:40px 12px}
/* 채팅 화면 */
.chat{display:flex;flex-direction:column;height:100dvh;max-width:640px;margin:0 auto;width:100%}
.chat .topbar{padding:10px 12px;background:var(--surface);box-shadow:0 1px 0 var(--line);position:sticky;top:0;z-index:2}
.chat .topbar .iconbtn{box-shadow:none;background:var(--blue-bg)}
.msgs{flex:1;overflow-y:auto;padding:12px 12px 6px;display:flex;flex-direction:column;gap:6px;-webkit-overflow-scrolling:touch}
.daysep{align-self:center;font-size:12px;color:var(--sub2);background:rgba(255,255,255,.7);border-radius:999px;padding:3px 12px;margin:8px 0}
.msg{display:flex;flex-direction:column;max-width:82%;align-self:flex-start}
.msg.mine{align-self:flex-end;align-items:flex-end}
.msg .who{font-size:12px;color:var(--sub);margin:4px 4px 2px;display:flex;gap:6px;align-items:center}
.msg .who .tag{font-size:10.5px;font-weight:800;color:var(--blue);background:var(--blue-bg);border-radius:999px;padding:1px 7px}
.bubble{background:var(--surface);border-radius:18px;padding:10px 14px;box-shadow:var(--shadow-card);font-size:15px;white-space:pre-wrap;word-break:break-word;overflow-wrap:anywhere}
.msg.mine .bubble{background:var(--grad-blue);color:#fff;box-shadow:0 14px 24px -14px rgba(47,99,240,.5)}
.msg.system{align-self:center;max-width:100%}
.msg.system .bubble{background:transparent;box-shadow:none;color:var(--sub2);font-size:12.5px;padding:2px 8px}
.bubble.hidden{color:var(--sub2);font-style:italic;background:var(--bg);box-shadow:none}
.msg .time{font-size:11px;color:var(--sub2);margin:3px 6px 0;display:flex;gap:6px}
.msg .time .state{font-weight:700}
.msg .time .state.fail{color:var(--bad)}
.imgs{display:grid;gap:4px;grid-template-columns:repeat(2,1fr);width:min(320px,78vw);margin-top:2px}
.imgs img{width:100%;aspect-ratio:1;object-fit:cover;border-radius:12px;background:var(--bg);cursor:zoom-in;display:block}
.imgs.one{grid-template-columns:1fr;width:min(260px,70vw)}
.imgs.one img{aspect-ratio:auto;max-height:320px;object-fit:contain;background:transparent}
.composer{position:sticky;bottom:0;background:var(--surface);box-shadow:0 -1px 0 var(--line);padding:8px 10px calc(8px + env(safe-area-inset-bottom));display:flex;flex-direction:column;gap:6px}
.composer .row{align-items:flex-end}
.composer textarea{flex:1;resize:none;max-height:120px;min-height:44px;padding:11px 14px;border:1px solid var(--line);border-radius:14px;font-size:16px;background:#fff}
.composer textarea:focus{outline:2px solid var(--blue);border-color:transparent}
.previews{display:flex;gap:6px;overflow-x:auto}
.previews .pv{position:relative;flex:none;width:64px;height:64px}
.previews img{width:64px;height:64px;object-fit:cover;border-radius:10px}
.previews .rm{position:absolute;top:-6px;right:-6px;width:22px;height:22px;border-radius:999px;border:0;background:var(--navy);color:#fff;font-size:12px;cursor:pointer}
.previews .pv.up::after{content:"";position:absolute;inset:0;border-radius:10px;background:rgba(255,255,255,.55)}
.sendbtn{width:46px;height:46px;border-radius:14px;border:0;background:var(--grad-blue);color:#fff;font-weight:900;cursor:pointer;flex:none;box-shadow:0 10px 18px -10px rgba(47,99,240,.6)}
.sendbtn[disabled]{opacity:.5}
.attachbtn{width:46px;height:46px;border-radius:14px;border:0;background:var(--blue-bg);color:var(--blue);font-size:20px;cursor:pointer;flex:none}
.netbar{font-size:12px;text-align:center;padding:4px;background:var(--warn-bg);color:var(--warn)}
.typing{font-size:12px;color:var(--sub2);min-height:16px;padding:0 6px}
.spinner{width:28px;height:28px;border:3px solid var(--line);border-top-color:var(--blue);border-radius:50%;margin:0 auto 12px;animation:spin .9s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:var(--navy);color:#fff;padding:10px 16px;border-radius:999px;font-size:14px;font-weight:700;box-shadow:var(--shadow-float);z-index:50;max-width:90vw}
.toast[hidden]{display:none}
.lightbox{position:fixed;inset:0;background:rgba(10,16,32,.92);display:grid;place-items:center;z-index:40}
.lightbox img{max-width:96vw;max-height:92vh;border-radius:8px}
.code{display:flex;gap:8px}
.code .input{text-align:center;letter-spacing:.3em;font-size:22px;font-weight:800}
.menu{background:var(--surface);border-radius:16px;box-shadow:var(--shadow-float);padding:6px;position:absolute;right:12px;top:58px;z-index:5;min-width:180px}
.menu button{display:block;width:100%;text-align:left;border:0;background:transparent;padding:11px 12px;border-radius:10px;font-weight:700;color:var(--ink);cursor:pointer}
.menu button:hover{background:var(--blue-bg)}
.memberlist .item{display:flex;justify-content:space-between;align-items:center;padding:10px 0;border-bottom:1px solid var(--line);font-size:14px}
.kv{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;font-size:14px}
.kv dt{color:var(--sub);font-weight:700}.kv dd{margin:0}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ── 스레드(답글) ── */
.msg .time .replybtn{border:0;background:transparent;color:var(--sub2);font-size:11px;font-weight:700;padding:0 2px;cursor:pointer;opacity:.75}
.msg .time .replybtn:hover{color:var(--blue);opacity:1}
.thread{align-self:flex-start;max-width:88%;margin:-2px 0 4px 10px;border-left:2px solid var(--line);padding-left:10px;display:flex;flex-direction:column;gap:6px}
.thread.mine{align-self:flex-end;margin:-2px 10px 4px 0;border-left:0;border-right:2px solid var(--line);padding:0 10px 0 0;align-items:flex-end}
.thread-toggle{border:0;background:var(--blue-bg);color:var(--blue);font-weight:800;font-size:12.5px;border-radius:999px;padding:5px 12px;cursor:pointer;align-self:flex-start}
.thread.mine .thread-toggle{align-self:flex-end}
.thread-toggle .tri{display:inline-block;width:10px}
.thread-toggle .last{font-weight:600;color:var(--sub);margin-left:2px}
.thread:not(.open) .thread-body{display:none}
.thread-body{display:flex;flex-direction:column;gap:6px;width:100%}
.thread-body .msg{max-width:100%}
.thread-body .msg.reply .bubble{font-size:14px;padding:8px 12px;border-radius:14px}
.thread-more{border:0;background:transparent;color:var(--blue);font-weight:700;font-size:12.5px;cursor:pointer;padding:4px 0;align-self:flex-start}
.replybar{display:flex;align-items:center;gap:8px;background:var(--blue-bg);border-radius:12px;padding:8px 10px;font-size:13px;color:var(--ink)}
.replybar[hidden]{display:none}
.replybar .rb-ic{color:var(--blue);font-weight:900}
.replybar #replyto{flex:1;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.replybar .rb-x{border:0;background:transparent;font-size:18px;line-height:1;color:var(--sub);cursor:pointer;padding:0 4px}