:root{
  --green:#008069; --green2:#00a884; --bg:#eae6df; --panel:#fff; --panel2:#f0f2f5; --line:#e9edef;
  --text:#111b21; --muted:#667781; --out:#d9fdd3; --in:#fff; --chatbg:#efeae2; --hover:#f5f6f6; --sel:#f0f2f5;
  --tick:#53bdeb; --danger:#ea0038; --shadow:0 1px .5px rgba(11,20,26,.13);
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#0c1317; --panel:#111b21; --panel2:#202c33; --line:#222d34; --text:#e9edef; --muted:#8696a0;
    --out:#005c4b; --in:#202c33; --chatbg:#0b141a; --hover:#202c33; --sel:#2a3942; --green:#00a884; }
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font-family:Segoe UI,Helvetica Neue,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);font-size:15px;overflow:hidden}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
input,textarea,select{font:inherit;color:var(--text)}
.hidden{display:none!important}

/* Auth */
.auth{height:100%;display:flex;align-items:center;justify-content:center;padding:16px;
  background:linear-gradient(var(--green) 0 220px, var(--bg) 220px)}
.auth-card{background:var(--panel);width:100%;max-width:380px;border-radius:12px;padding:28px 24px;box-shadow:0 8px 30px rgba(0,0,0,.15)}
.auth-logo{text-align:center;margin-bottom:18px}
.auth-logo img{width:64px;height:64px}
.auth-logo h1{font-size:24px;color:var(--green);margin-top:6px}
.auth-logo p{color:var(--muted);font-size:14px}
.auth-tabs{display:flex;margin-bottom:14px;border-bottom:1px solid var(--line)}
.auth-tabs button{flex:1;padding:10px;color:var(--muted);border-bottom:3px solid transparent}
.auth-tabs button.active{color:var(--green);border-color:var(--green);font-weight:600}
form input,.field{width:100%;padding:12px;border:1px solid var(--line);border-radius:8px;margin-bottom:10px;background:var(--panel2);outline:none}
form input:focus,.field:focus{border-color:var(--green2)}
.btn{width:100%;padding:12px;background:var(--green2);color:#fff;border-radius:24px;font-weight:600}
.btn.sec{background:var(--panel2);color:var(--text)}
.btn.danger{background:transparent;color:var(--danger);border:1px solid var(--danger)}
.btn:disabled{opacity:.6}
.err{color:var(--danger);font-size:14px;text-align:center;margin-top:8px;min-height:18px}
.otp-info{font-size:14px;color:var(--muted);text-align:center;margin-bottom:12px;line-height:1.5}
.otp-info b{color:var(--text)}
.otp-lbl{display:block;font-size:13px;font-weight:600;color:var(--green2);margin:4px 0}
form input.otp{text-align:center;font-size:24px;letter-spacing:10px;font-family:Consolas,monospace}
.otp-foot{display:flex;justify-content:space-between;margin-top:12px}
.link{color:var(--green2);font-size:14px}
.link:disabled{color:var(--muted);cursor:default}
.note{background:#fff3c4;color:#5c4400;padding:8px 10px;border-radius:8px;font-size:13px;margin-bottom:10px}

/* Layout */
.app{display:flex;height:100%;max-width:1600px;margin:0 auto;background:var(--panel)}
@media(min-width:1440px){.app{height:calc(100% - 38px);margin-top:19px;box-shadow:0 6px 18px rgba(11,20,26,.05)}}
.side{width:30%;min-width:320px;max-width:440px;display:flex;flex-direction:column;border-right:1px solid var(--line);background:var(--panel)}
.main{flex:1;display:flex;flex-direction:column;background:var(--chatbg);min-width:0}
.side-head,.conv-head{height:60px;background:var(--panel2);display:flex;align-items:center;padding:0 12px;gap:10px;flex-shrink:0}
.side-head{justify-content:space-between}
.head-actions{position:relative;display:flex;gap:4px}
.ic{width:40px;height:40px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-size:20px;color:var(--muted);flex-shrink:0}
.ic:hover{background:rgba(0,0,0,.06)}
.me{cursor:pointer}
.dropdown{position:absolute;right:0;top:44px;background:var(--panel);box-shadow:0 2px 12px rgba(0,0,0,.2);border-radius:6px;padding:8px 0;z-index:20;min-width:210px}
.dropdown button{display:block;width:100%;text-align:left;padding:11px 22px}
.dropdown button:hover{background:var(--hover)}
.search{padding:8px 12px;border-bottom:1px solid var(--line)}
.search input{width:100%;padding:8px 14px;border-radius:8px;border:0;background:var(--panel2);outline:none}
.filters{display:flex;gap:8px;padding:8px 12px;overflow-x:auto}
.filters button{padding:6px 12px;border-radius:16px;background:var(--panel2);color:var(--muted);font-size:14px;white-space:nowrap}
.filters button.active{background:#d9fdd3;color:#008069}
@media (prefers-color-scheme: dark){.filters button.active{background:#0a332c;color:#00a884}}
.chat-list{list-style:none;overflow-y:auto;flex:1}
.chat-item{display:flex;align-items:center;gap:12px;padding:0 12px;height:72px;cursor:pointer}
.chat-item:hover{background:var(--hover)}
.chat-item.active{background:var(--sel)}
.chat-item .ci-body{flex:1;min-width:0;border-bottom:1px solid var(--line);height:100%;display:flex;flex-direction:column;justify-content:center}
.ci-top,.ci-bot{display:flex;justify-content:space-between;align-items:center;gap:6px}
.ci-name{font-size:16px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ci-time{font-size:12px;color:var(--muted);flex-shrink:0}
.ci-last{font-size:14px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.unread .ci-time{color:var(--green2)}
.badge{background:var(--green2);color:#fff;border-radius:12px;font-size:12px;min-width:20px;height:20px;padding:0 6px;display:inline-flex;align-items:center;justify-content:center;font-weight:600}
.tag{font-size:11px;color:var(--muted);border:1px solid var(--line);border-radius:4px;padding:0 4px;margin-left:4px}
.list-empty{padding:30px;text-align:center;color:var(--muted);font-size:14px}

.avatar{border-radius:50%;flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;color:#fff;font-weight:600;overflow:hidden;position:relative;background-size:cover;background-position:center}
.avatar.online::after{content:"";position:absolute;right:1px;bottom:1px;width:11px;height:11px;border-radius:50%;background:#25d366;border:2px solid var(--panel)}

/* Empty */
.empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:var(--muted);background:var(--panel2);border-bottom:6px solid var(--green2);padding:20px}
.empty img{width:120px;opacity:.85;margin-bottom:20px}
.empty h2{font-weight:300;font-size:32px;color:var(--text);margin-bottom:10px}

/* Conversation */
.conv{flex:1;display:flex;flex-direction:column;min-height:0}
.conv-head .back{display:none}
.conv-who{flex:1;display:flex;align-items:center;gap:12px;cursor:pointer;min-width:0}
.conv-who .t{min-width:0}
.conv-who .n{font-size:16px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.conv-who .s{font-size:13px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.conv-who .s.typing{color:var(--green2)}
.msgs{flex:1;overflow-y:auto;padding:12px 6% 8px;display:flex;flex-direction:column;
  background-color:var(--chatbg);
  background-image:radial-gradient(rgba(0,0,0,.035) 1px,transparent 1px);background-size:18px 18px}
.day{align-self:center;background:var(--panel);color:var(--muted);font-size:12.5px;padding:5px 12px;border-radius:8px;margin:10px 0;box-shadow:var(--shadow);text-transform:uppercase}
.sys{align-self:center;background:#ffeecd;color:#54656f;font-size:12.5px;padding:5px 12px;border-radius:8px;margin:4px 0;text-align:center;max-width:85%}
@media (prefers-color-scheme: dark){.sys{background:#182229;color:#8696a0}}
.msg{max-width:65%;padding:6px 8px 8px 9px;border-radius:8px;margin:1px 0;box-shadow:var(--shadow);position:relative;word-wrap:break-word;overflow-wrap:anywhere;white-space:pre-wrap;line-height:1.35}
.msg.in{align-self:flex-start;background:var(--in)}
.msg.out{align-self:flex-end;background:var(--out)}
.msg.first.in{border-top-left-radius:0;margin-top:8px}
.msg.first.out{border-top-right-radius:0;margin-top:8px}
.msg .who{font-size:13px;font-weight:600;margin-bottom:2px}
.msg .meta{float:right;font-size:11px;color:var(--muted);margin:8px 0 -4px 10px;white-space:nowrap}
.msg .tick{margin-left:3px;letter-spacing:-3px}
.msg .tick.read{color:var(--tick)}
.msg.deleted .body{color:var(--muted);font-style:italic}
.msg img.photo{display:block;max-width:100%;width:330px;max-height:360px;object-fit:cover;border-radius:6px;cursor:pointer;margin-bottom:2px}
.msg video{display:block;max-width:100%;width:330px;border-radius:6px}
.msg audio{max-width:260px}
.file{display:flex;align-items:center;gap:10px;background:rgba(0,0,0,.05);border-radius:6px;padding:10px;color:inherit;text-decoration:none;margin-bottom:2px}
.file .fi{font-size:26px}
.quote{background:rgba(0,0,0,.05);border-left:4px solid var(--green2);border-radius:6px;padding:4px 8px;margin-bottom:4px;font-size:13px;cursor:pointer}
.quote b{color:var(--green2);display:block;font-size:12.5px}
.quote span{color:var(--muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.msg a{color:#027eb5}
.msg.flash{animation:flash 1.2s}
@keyframes flash{0%,60%{filter:brightness(.85)}}
.more{align-self:center;margin:6px;padding:6px 14px;border-radius:16px;background:var(--panel);box-shadow:var(--shadow);font-size:13px;color:var(--muted)}

.reply-bar{display:flex;align-items:center;gap:8px;background:var(--panel2);padding:8px 12px 0}
.reply-bar>div{flex:1;background:var(--panel);border-left:4px solid var(--green2);border-radius:6px;padding:6px 10px;font-size:13px;min-width:0}
.reply-bar b{color:var(--green2)}
.composer{display:flex;align-items:flex-end;gap:6px;background:var(--panel2);padding:8px 10px;flex-shrink:0}
.composer textarea{flex:1;resize:none;border:0;border-radius:8px;padding:10px 12px;background:var(--panel);outline:none;max-height:140px;line-height:1.35}
.attach{cursor:pointer}
.send{width:44px;height:44px;border-radius:50%;background:var(--green2);color:#fff;font-size:18px;flex-shrink:0}
.readonly{background:var(--panel2);padding:16px;text-align:center;color:var(--muted);font-size:14px}
.readonly .btn{max-width:260px}

/* Modal */
.modal{position:fixed;inset:0;background:rgba(11,20,26,.55);display:flex;align-items:center;justify-content:center;z-index:50;padding:16px}
.modal-box{background:var(--panel);width:100%;max-width:440px;max-height:90vh;border-radius:10px;display:flex;flex-direction:column;overflow:hidden}
.mh{background:var(--green);color:#fff;padding:16px 18px;display:flex;align-items:center;gap:12px;font-size:17px;font-weight:600}
.mh .ic{color:#fff}
.mb{padding:16px 18px;overflow-y:auto;flex:1}
.mf{padding:12px 18px;display:flex;gap:8px;border-top:1px solid var(--line)}
.mb label.lbl{display:block;font-size:13px;color:var(--green2);margin:6px 0 4px}
.pick{list-style:none}
.pick li{display:flex;align-items:center;gap:12px;padding:8px 4px;cursor:pointer;border-radius:6px}
.pick li:hover{background:var(--hover)}
.pick li .grow{flex:1;min-width:0}
.pick li .sub{font-size:13px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pick input[type=checkbox]{width:18px;height:18px;accent-color:var(--green2)}
.pick .sub a{color:var(--green2);text-decoration:none}
.filters{scrollbar-width:none}.filters::-webkit-scrollbar{display:none}
.chip{font-size:11px;color:var(--green2);border:1px solid var(--green2);border-radius:10px;padding:0 6px;margin-left:6px}
.chip.red{color:var(--danger);border-color:var(--danger)}
.info-top{text-align:center;padding:10px 0 16px}
.info-top .avatar{margin:0 auto 10px}
.info-top h3{font-size:21px;font-weight:400}
.info-top p{color:var(--muted);font-size:14px}
.section{border-top:8px solid var(--panel2);margin:0 -18px;padding:12px 18px}
.section h4{font-size:14px;color:var(--muted);font-weight:400;margin-bottom:8px}
.code-box{display:flex;gap:8px;align-items:center;background:var(--panel2);border-radius:8px;padding:10px;font-family:Consolas,monospace;word-break:break-all;font-size:13px}
.code-box span{flex:1}
.small-btn{padding:6px 12px;border-radius:14px;background:var(--panel2);font-size:13px}
.small-btn.g{background:var(--green2);color:#fff}
.small-btn.r{color:var(--danger)}
.row{display:flex;gap:8px;align-items:center;margin-bottom:8px}
table.t{width:100%;border-collapse:collapse;font-size:13px}
table.t td{padding:6px 4px;border-bottom:1px solid var(--line)}
.switch{display:flex;align-items:center;gap:10px;margin:8px 0;cursor:pointer}
.switch input{width:18px;height:18px;accent-color:var(--green2)}

.ctx{position:fixed;background:var(--panel);box-shadow:0 2px 12px rgba(0,0,0,.25);border-radius:6px;padding:6px 0;z-index:60;min-width:160px}
.ctx button{display:block;width:100%;text-align:left;padding:10px 20px}
.ctx button:hover{background:var(--hover)}
.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%) translateY(20px);background:#323232;color:#fff;padding:10px 18px;border-radius:8px;font-size:14px;opacity:0;pointer-events:none;transition:.25s;z-index:70;max-width:90%}
.toast.show{opacity:1;transform:translateX(-50%)}
.viewer{position:fixed;inset:0;background:rgba(0,0,0,.92);z-index:80;display:flex;align-items:center;justify-content:center;cursor:zoom-out}
.viewer img{max-width:95%;max-height:95%}

/* Mobile */
@media(max-width:760px){
  .side{width:100%;max-width:none;min-width:0;border:0}
  .main{position:fixed;inset:0;transform:translateX(100%);transition:transform .2s;z-index:10}
  .app.open .main{transform:none}
  .conv-head .back{display:inline-flex}
  .side-head,.conv-head{background:var(--green);color:#fff}
  .side-head .ic,.conv-head .ic,.conv-who .s{color:#fff}
  .conv-who .s.typing{color:#d9fdd3}
  .msgs{padding:10px 3%}
  .msg{max-width:85%}
  .empty{display:none}
  .composer{padding-bottom:max(8px,env(safe-area-inset-bottom))}
}