:root{--blue:#0a7bc4;--blue2:#2ea3e6;--sky:#eaf5fc;--line:#d6e6f2;--text:#1e3344;--dim:#6d8496;--me:#d9effc;--them:#fff;--green:#5cb85c;--danger:#d9534f}
*{box-sizing:border-box}
html,body{margin:0;height:100%;font:14px/1.4 "Segoe UI",system-ui,-apple-system,Roboto,Arial,sans-serif;color:var(--text);background:var(--sky)}
button{font:inherit;cursor:pointer}
.hidden{display:none!important}
.small{font-size:12px;color:var(--dim)}
.msg{min-height:18px;margin-top:8px;color:var(--danger);font-size:13px}
.msg.ok{color:var(--green)}
.primary{background:linear-gradient(var(--blue2),var(--blue));color:#fff;border:0;border-radius:6px;padding:9px 16px;font-weight:600}
.primary:hover{filter:brightness(1.08)}
.danger{background:#fff;color:var(--danger);border:1px solid #e8b8b6;border-radius:6px;padding:8px 14px}
.icon{background:none;border:0;font-size:18px;padding:6px 8px;border-radius:6px;color:var(--blue)}
.icon:hover{background:var(--sky)}
input,textarea{font:inherit;color:var(--text)}
/* ---------- auth ---------- */
.auth{min-height:100%;display:flex;align-items:center;justify-content:center;padding:20px;background:radial-gradient(circle at 30% 20%,#bfe3fa,#eaf5fc 60%)}
.auth-card{width:100%;max-width:380px;background:#fff;border-radius:14px;padding:26px;box-shadow:0 8px 30px rgba(10,123,196,.18)}
.logo{display:flex;align-items:center;gap:10px;font-size:28px;font-weight:600;color:var(--blue);margin-bottom:16px}
.logo img{width:40px;height:40px}
.tabs{display:flex;border-bottom:1px solid var(--line);margin-bottom:14px}
.tabs button{flex:1;background:none;border:0;padding:8px;color:var(--dim);border-bottom:2px solid transparent}
.tabs button.on{color:var(--blue);border-color:var(--blue);font-weight:600}
.form{display:flex;flex-direction:column;gap:10px}
.form label,.dialog label{display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--dim)}
.form input,.dialog input[type=text],.dialog input:not([type]),.dialog input[type=password]{padding:9px 10px;border:1px solid var(--line);border-radius:6px;font-size:15px}
.form input:focus,.dialog input:focus,textarea:focus{outline:2px solid #9fd2f3;border-color:var(--blue2)}
/* ---------- layout ---------- */
.main{display:flex;height:100vh;height:100dvh}
.side{width:320px;min-width:260px;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column}
.me{display:flex;align-items:center;gap:10px;padding:12px;background:linear-gradient(var(--blue2),var(--blue));color:#fff}
.me .icon{color:#fff}.me .icon:hover{background:rgba(255,255,255,.15)}
.me-text{flex:1;min-width:0}
.nick{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mood{font-size:12px;opacity:.85;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.me .mood{color:#e3f3ff}
.banner{background:#fff6d5;border-bottom:1px solid #f0dd9b;padding:8px 12px;font-size:12px}
.search{padding:10px}
.search input{width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:16px;background:var(--sky)}
.side-tabs{display:flex;border-bottom:1px solid var(--line)}
.side-tabs button{flex:1;background:none;border:0;padding:8px;color:var(--dim);border-bottom:2px solid transparent}
.side-tabs button.on{color:var(--blue);border-color:var(--blue);font-weight:600}
.badge{background:var(--danger);color:#fff;border-radius:9px;padding:0 6px;font-size:11px}
.list{flex:1;overflow-y:auto}
.item{display:flex;align-items:center;gap:10px;padding:9px 12px;cursor:pointer;border-bottom:1px solid #f0f6fa}
.item:hover{background:#f3f9fd}.item.on{background:var(--me)}
.item .text{flex:1;min-width:0}
.item .preview{font-size:12px;color:var(--dim);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.item .unread{background:var(--blue);color:#fff;border-radius:10px;padding:0 7px;font-size:12px;font-weight:600}
.item .acts button{font-size:12px;padding:4px 8px;margin-left:4px;border-radius:5px;border:1px solid var(--line);background:#fff}
.item .acts .ok{background:var(--green);color:#fff;border-color:var(--green)}
.section{padding:8px 12px 4px;font-size:11px;text-transform:uppercase;color:var(--dim);letter-spacing:.04em}
.avatar{width:36px;height:36px;border-radius:50%;background:#c9e3f5 center/cover no-repeat;flex:none;position:relative;display:flex;align-items:center;justify-content:center;color:var(--blue);font-weight:700}
.avatar.big{width:48px;height:48px;font-size:18px}
.avatar .dot{position:absolute;right:-1px;bottom:-1px;width:12px;height:12px;border-radius:50%;border:2px solid #fff;background:#b8c4cc}
.avatar .dot.on{background:#43c43f}
/* ---------- chat ---------- */
.chat{flex:1;display:flex;flex-direction:column;min-width:0;position:relative;background:#f7fbfe}
.empty{margin:auto;text-align:center;color:var(--dim);padding:20px}
.empty img{width:90px;opacity:.5}
.chat-head{display:flex;align-items:center;gap:10px;padding:10px 12px;background:#fff;border-bottom:1px solid var(--line);position:relative}
.peer-text{flex:1;min-width:0}
.peer-text .mood{color:var(--dim)}
.back{display:none}
.menu{position:absolute;right:10px;top:54px;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 6px 20px rgba(0,40,80,.15);z-index:20;display:flex;flex-direction:column;min-width:240px}
.menu button{background:none;border:0;text-align:left;padding:10px 14px}
.menu button:hover{background:var(--sky)}
.messages{flex:1;overflow-y:auto;padding:14px 16px}
.day{text-align:center;color:var(--dim);font-size:12px;margin:12px 0 6px}
.bubble{max-width:72%;margin:3px 0;padding:7px 10px 5px;border-radius:12px;background:var(--them);border:1px solid #e1edf6;word-wrap:break-word;white-space:pre-wrap;position:relative}
.bubble.mine{margin-left:auto;background:var(--me);border-color:#c4e3f7}
.bubble .time{font-size:11px;color:var(--dim);margin-left:8px;float:right;margin-top:4px}
.bubble .tick{color:#7fb5d9}.bubble .tick.read{color:var(--blue)}
.bubble img.sm{height:22px;vertical-align:middle}
.bubble .photo{display:block;max-width:100%;max-height:320px;border-radius:8px;margin:2px 0 4px;cursor:zoom-in}
.bubble video{max-width:100%;max-height:320px;border-radius:8px}
.bubble .file{display:inline-flex;align-items:center;gap:8px;text-decoration:none;color:var(--blue);font-weight:600}
.bubble a{color:var(--blue)}
.more{display:block;margin:0 auto 10px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:4px 14px;color:var(--blue)}
.typing{padding:2px 18px;font-size:12px;color:var(--dim);font-style:italic}
.composer{display:flex;align-items:flex-end;gap:6px;padding:8px 10px;background:#fff;border-top:1px solid var(--line);position:relative}
.composer textarea{flex:1;resize:none;border:1px solid var(--line);border-radius:18px;padding:8px 12px;max-height:160px;font-size:15px}
.send{border-radius:50%;width:40px;height:40px;padding:0;font-size:16px}
.smiles{position:absolute;bottom:58px;left:8px;width:min(420px,calc(100vw - 16px));height:280px;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 8px 24px rgba(0,40,80,.18);display:flex;flex-direction:column;z-index:20}
.smile-tabs{display:flex;border-bottom:1px solid var(--line)}
.smile-tabs button{flex:1;background:none;border:0;padding:6px}
.smile-tabs button.on{color:var(--blue);font-weight:600}
.smile-grid{flex:1;overflow-y:auto;display:flex;flex-wrap:wrap;gap:2px;padding:6px;align-content:flex-start}
.smile-grid img{width:32px;height:32px;object-fit:contain;cursor:pointer;padding:2px;border-radius:4px}
.smile-grid img:hover{background:var(--sky)}
.progress{height:3px;background:var(--blue2);transition:width .2s}
/* ---------- dialog / toast ---------- */
.dialog{border:0;border-radius:12px;padding:20px;width:min(420px,calc(100vw - 20px));box-shadow:0 10px 40px rgba(0,40,80,.3)}
.dialog form{display:flex;flex-direction:column;gap:10px}
.dialog h3{margin:0 0 4px;color:var(--blue)}
.dialog .row{display:flex;align-items:center;gap:12px}
.dialog .btn{color:var(--blue);cursor:pointer;flex-direction:row}
.dialog .check{flex-direction:row;align-items:center;gap:8px;color:var(--text)}
.dialog .buttons{display:flex;gap:8px;align-items:center}.dialog .buttons span{flex:1}
.dialog .buttons button[value=cancel]{background:#fff;border:1px solid var(--line);border-radius:6px;padding:8px 14px}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:#1e3344;color:#fff;padding:10px 16px;border-radius:8px;z-index:99;max-width:90vw}
.viewer{position:fixed;inset:0;background:rgba(0,0,0,.85);display:flex;align-items:center;justify-content:center;z-index:90;cursor:zoom-out}
.viewer img{max-width:95vw;max-height:95vh}
/* ---------- calls ---------- */
.call{position:fixed;inset:0;background:radial-gradient(circle at 50% 30%,#1f4f73,#0b1c2a);z-index:80;display:flex;align-items:center;justify-content:center;color:#fff}
.call .remote{width:100%;height:100%;object-fit:contain;background:transparent}
.call .local{position:absolute;right:16px;bottom:96px;width:min(28vw,240px);border-radius:10px;border:2px solid rgba(255,255,255,.6);background:#000}
.call-top{position:absolute;top:18px;left:0;right:0;text-align:center;text-shadow:0 1px 4px #000}
.call-name{font-size:22px;font-weight:600}.call-state{opacity:.85}
.call-bar{position:absolute;bottom:22px;left:0;right:0;display:flex;justify-content:center;gap:12px}
.call-bar button,.inc-btns button{border:0;border-radius:50%;width:54px;height:54px;font-size:22px;background:rgba(255,255,255,.18);color:#fff}
.call-bar button.on{background:#2ea3e6}.call-bar button.off{background:#8a2c2a}
.call-bar .hang{background:var(--danger);transform:rotate(135deg)}
.incoming{position:absolute;inset:auto 0 30px 0;text-align:center}
.inc-text{font-size:20px;margin-bottom:14px}
.inc-btns{display:flex;justify-content:center;gap:14px;flex-wrap:wrap}
.inc-btns button{width:auto;height:auto;border-radius:24px;padding:12px 20px;font-size:16px}
.inc-btns .ok{background:#43c43f}.inc-btns .no{background:var(--danger)}
/* ---------- phone ---------- */
@media (max-width:720px){
  .side{width:100%;min-width:0;border:0}
  .main.in-chat .side{display:none}
  .main:not(.in-chat) .chat{display:none}
  .back{display:inline-block}
  .bubble{max-width:86%}
}