/* ===== KALIN — giao diện ===== */
:root{
  --brand:#4f46e5; --brand2:#06b6d4; --brand-ink:#3730a3;
  --bg:#eef1f8; --panel:#ffffff; --panel2:#f7f8fc; --line:#e5e8f1;
  --ink:#0f172a; --ink2:#475569; --ink3:#94a3b8;
  --mine:#4f46e5; --mine-ink:#ffffff; --theirs:#ffffff; --theirs-ink:#0f172a;
  --ok:#16a34a; --danger:#dc2626; --radius:18px;
  --grad:linear-gradient(135deg,#4f46e5 0%,#7c3aed 45%,#06b6d4 100%);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0b1020; --panel:#121933; --panel2:#0f1530; --line:#232c4d; --ink:#e7ebf7; --ink2:#a6b0cf; --ink3:#6b7699;
    --theirs:#1b2347; --theirs-ink:#e7ebf7; --mine:#5b54f0;
  }
}
:root[data-theme="dark"]{ --bg:#0b1020; --panel:#121933; --panel2:#0f1530; --line:#232c4d; --ink:#e7ebf7; --ink2:#a6b0cf; --ink3:#6b7699; --theirs:#1b2347; --theirs-ink:#e7ebf7; --mine:#5b54f0; }
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{font-family:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;font-size:14.5px}
button,input,textarea,select{font:inherit;color:inherit}
button{cursor:pointer}
a{color:var(--brand)}
.boot{height:100vh;display:grid;place-items:center}
.logo-k{width:40px;height:40px;border-radius:13px;background:#fff url(/icons/logo.svg?v=b2) center/84% no-repeat;color:transparent;font-size:0!important;display:grid;place-items:center;overflow:hidden;box-shadow:0 8px 24px rgba(79,70,229,.25)}
.logo-k.big{width:72px;height:72px;border-radius:22px;font-size:40px;animation:pulse 1.4s ease-in-out infinite}
@keyframes pulse{50%{transform:scale(.92);opacity:.8}}

/* ---------- đăng nhập ---------- */
.auth{min-height:100vh;display:grid;grid-template-columns:1.1fr 1fr;background:var(--panel)}
.auth-hero{background:var(--grad);color:#fff;padding:56px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}
.auth-hero:before,.auth-hero:after{content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.12)}
.auth-hero:before{width:420px;height:420px;right:-140px;top:-120px}
.auth-hero:after{width:300px;height:300px;left:-90px;bottom:-110px}
.auth-hero h1{font-size:44px;line-height:1.1;margin:28px 0 12px;letter-spacing:-1px}
.auth-hero p{font-size:17px;opacity:.92;max-width:440px;line-height:1.6}
.auth-hero .feat{display:grid;gap:12px;margin-top:28px;position:relative;z-index:1}
.auth-hero .feat div{display:flex;gap:12px;align-items:center;font-weight:500}
.auth-hero .feat i{width:36px;height:36px;border-radius:12px;background:rgba(255,255,255,.18);display:grid;place-items:center;font-style:normal}
.brand-row{display:flex;align-items:center;gap:12px;position:relative;z-index:1}
.brand-row .logo-k{background-color:#fff}
.brand-row b{font-size:24px;letter-spacing:-.5px}
.auth-form{display:grid;place-items:center;padding:32px 20px}
.auth-card{width:100%;max-width:400px}
.auth-card h2{margin:0 0 6px;font-size:26px}
.auth-card .sub{color:var(--ink2);margin:0 0 22px}
.seg{display:grid;grid-template-columns:1fr 1fr;background:var(--panel2);border:1px solid var(--line);border-radius:14px;padding:4px;margin-bottom:18px}
.seg button{border:0;background:transparent;padding:10px;border-radius:10px;font-weight:600;color:var(--ink2)}
.seg button.on{background:var(--panel);color:var(--ink);box-shadow:0 2px 8px rgba(15,23,42,.08)}
.field{margin-bottom:12px}
.field label{display:block;font-size:13px;font-weight:600;color:var(--ink2);margin-bottom:6px}
.inp{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:12px;background:var(--panel);outline:none;transition:border .15s}
.inp:focus{border-color:var(--brand)}
.btn{border:0;border-radius:12px;padding:11px 16px;font-weight:600;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:transform .08s,filter .15s}
.btn:active{transform:scale(.98)}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 20px rgba(79,70,229,.28)}
.btn-primary:hover{filter:brightness(1.06)}
.btn-ghost{background:var(--panel2);color:var(--ink);border:1px solid var(--line)}
.btn-danger{background:#fee2e2;color:#b91c1c}
.btn-block{width:100%}
.btn[disabled]{opacity:.6;pointer-events:none}
.or{display:flex;align-items:center;gap:10px;color:var(--ink3);font-size:12.5px;margin:18px 0}
.or:before,.or:after{content:"";flex:1;height:1px;background:var(--line)}
.err{color:var(--danger);font-size:13px;min-height:18px;margin:4px 0 8px}

/* ---------- khung chính ---------- */
.shell{height:100vh;height:100dvh;display:grid;grid-template-columns:76px 360px 1fr;background:var(--bg)}
.embed .shell{grid-template-columns:0 340px 1fr}
.embed .rail{display:none}
.rail{background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;align-items:center;padding:14px 0;gap:10px}
.rail .sp{flex:1}
.rail-btn{width:46px;height:46px;border-radius:14px;border:0;background:transparent;display:grid;place-items:center;font-size:20px;color:var(--ink2);position:relative}
.rail-btn:hover,.rail-btn.on{background:var(--panel2);color:var(--brand)}
.list{background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;min-width:0}
.list-head{padding:16px 16px 10px;display:flex;align-items:center;gap:10px}
.list-head h1{font-size:22px;margin:0;flex:1;letter-spacing:-.4px}
.icon-btn{width:38px;height:38px;border-radius:12px;border:0;background:var(--panel2);display:grid;place-items:center;font-size:17px;color:var(--ink)}
.icon-btn:hover{background:var(--line)}
.search{margin:0 16px 10px;position:relative}
.search input{width:100%;padding:10px 12px 10px 36px;border-radius:12px;border:1px solid var(--line);background:var(--panel2);outline:none}
.search:before{content:"🔍";position:absolute;left:12px;top:50%;transform:translateY(-50%);font-size:13px;opacity:.6}
.convs{flex:1;overflow:auto;padding:4px 8px 12px}
.conv{display:flex;gap:12px;align-items:center;padding:10px;border-radius:14px;cursor:pointer;position:relative}
.conv:hover{background:var(--panel2)}
.conv.on{background:linear-gradient(90deg,rgba(79,70,229,.12),rgba(6,182,212,.08))}
.conv .meta{flex:1;min-width:0}
.conv .row{display:flex;gap:8px;align-items:baseline}
.conv .name{font-weight:600;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.conv .time{font-size:12px;color:var(--ink3);flex:none}
.conv .last{font-size:13px;color:var(--ink2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1}
.conv.unread .name,.conv.unread .last{font-weight:700;color:var(--ink)}
.badge{background:#ef4444;color:#fff;border-radius:999px;font-size:11.5px;font-weight:700;min-width:20px;height:20px;padding:0 6px;display:grid;place-items:center}
.tag{font-size:10.5px;font-weight:700;color:var(--brand);background:rgba(79,70,229,.1);border-radius:6px;padding:1px 6px;margin-left:4px}
.av{width:48px;height:48px;border-radius:50%;flex:none;display:grid;place-items:center;color:#fff;font-weight:700;font-size:17px;position:relative;background:#94a3b8;background-size:cover;background-position:center}
.av.sm{width:34px;height:34px;font-size:13px}
.av.xs{width:28px;height:28px;font-size:11px}
.av.lg{width:84px;height:84px;font-size:30px}
.av .dot{position:absolute;right:1px;bottom:1px;width:13px;height:13px;border-radius:50%;background:var(--ok);border:2.5px solid var(--panel)}
.empty-list{color:var(--ink3);text-align:center;padding:30px 16px;line-height:1.6}

/* ---------- khung chat ---------- */
.chat{display:flex;flex-direction:column;min-width:0;background:var(--bg)}
.chat-head{height:68px;padding:0 16px;display:flex;align-items:center;gap:12px;background:var(--panel);border-bottom:1px solid var(--line)}
.chat-head .t{flex:1;min-width:0}
.chat-head .t b{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:16px}
.chat-head .t span{font-size:12.5px;color:var(--ink2)}
.back{display:none}
.msgs{flex:1;overflow:auto;padding:16px 18px 8px;display:flex;flex-direction:column;gap:2px}
.more{align-self:center;margin:4px 0 10px}
.day{align-self:center;font-size:12px;color:var(--ink2);background:var(--panel);border:1px solid var(--line);border-radius:999px;padding:3px 12px;margin:12px 0 8px}
.sys{align-self:center;font-size:12.5px;color:var(--ink2);background:rgba(148,163,184,.14);border-radius:999px;padding:4px 12px;margin:6px 0;text-align:center;max-width:90%}
.m{display:flex;gap:8px;align-items:flex-end;max-width:78%;position:relative}
.m.mine{align-self:flex-end;flex-direction:row-reverse}
.m .av-slot{width:34px;flex:none}
.m .who{font-size:12px;color:var(--ink2);margin:6px 0 2px 12px}
.bubble{padding:9px 13px;border-radius:18px;background:var(--theirs);color:var(--theirs-ink);box-shadow:0 1px 2px rgba(15,23,42,.06);white-space:pre-wrap;word-wrap:break-word;overflow-wrap:anywhere;line-height:1.45;position:relative}
.mine .bubble{background:var(--mine);color:var(--mine-ink)}
.mine .bubble a{color:#e0e7ff}
.m.first .bubble{margin-top:6px}
.bubble.recalled{font-style:italic;opacity:.7;background:transparent;border:1px dashed var(--ink3);color:var(--ink2);box-shadow:none}
.bubble.img{padding:4px;background:transparent;box-shadow:none}
.bubble.img img{display:block;min-width:60px;min-height:60px;object-fit:cover;max-width:min(320px,62vw);max-height:360px;border-radius:14px;cursor:zoom-in;background:var(--line)}
.bubble .cap{padding:6px 8px 2px}
.filebox{display:flex;gap:10px;align-items:center;text-decoration:none;color:inherit}
.filebox i{font-style:normal;font-size:24px}
.filebox small{display:block;opacity:.75}
.quote{border-left:3px solid currentColor;opacity:.8;padding:2px 8px;margin-bottom:6px;font-size:12.5px}
.stamp{font-size:11px;color:var(--ink3);margin:2px 6px 0;align-self:flex-end}
#seen{align-self:flex-end}
.seen{font-size:11.5px;color:var(--ink3);margin:2px 4px 4px;text-align:right}
.acts{position:absolute;top:50%;transform:translateY(-50%);display:none;gap:2px;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:2px;box-shadow:0 4px 14px rgba(15,23,42,.1);z-index:2}
.m:not(.mine) .acts{right:-96px}
.m.mine .acts{left:-96px}
.m:hover .acts{display:flex}
.acts button{border:0;background:transparent;width:28px;height:28px;border-radius:8px;font-size:14px}
.acts button:hover{background:var(--panel2)}
.composer{background:var(--panel);border-top:1px solid var(--line);padding:10px 12px calc(10px + env(safe-area-inset-bottom))}
.replybar{display:flex;gap:10px;align-items:center;background:var(--panel2);border-radius:12px;padding:6px 10px;margin-bottom:8px;font-size:13px}
.replybar div{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.comp-row{display:flex;gap:8px;align-items:flex-end}
.comp-row textarea{flex:1;resize:none;max-height:140px;min-height:44px;padding:11px 14px;border-radius:14px;border:1.5px solid var(--line);background:var(--panel2);outline:none;line-height:1.4}
.comp-row textarea:focus{border-color:var(--brand);background:var(--panel)}
.send{width:44px;height:44px;border-radius:14px;border:0;background:var(--grad);color:#fff;font-size:18px;display:grid;place-items:center;flex:none}
.emoji-pop{position:absolute;bottom:64px;left:12px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:8px;display:grid;grid-template-columns:repeat(8,34px);gap:2px;box-shadow:0 12px 32px rgba(15,23,42,.18);z-index:5}
.emoji-pop button{border:0;background:transparent;font-size:20px;height:34px;border-radius:8px}
.emoji-pop button:hover{background:var(--panel2)}
.welcome{flex:1;display:grid;place-items:center;text-align:center;padding:24px;color:var(--ink2)}
.welcome h2{color:var(--ink);margin:18px 0 6px;font-size:24px}
.welcome .logo-k{width:84px;height:84px;border-radius:26px;font-size:46px;margin:auto}
.drop{position:absolute;inset:0;background:rgba(79,70,229,.12);border:3px dashed var(--brand);border-radius:16px;display:grid;place-items:center;font-weight:700;color:var(--brand);font-size:18px;z-index:6;pointer-events:none}

/* ---------- hộp thoại ---------- */
.ov{position:fixed;inset:0;background:rgba(2,6,23,.5);display:grid;place-items:center;z-index:50;padding:16px;animation:fade .15s}
@keyframes fade{from{opacity:0}}
.dlg{background:var(--panel);border-radius:20px;width:100%;max-width:440px;max-height:88vh;display:flex;flex-direction:column;box-shadow:0 24px 64px rgba(2,6,23,.35);animation:rise .18s}
@keyframes rise{from{transform:translateY(12px);opacity:0}}
.dlg-h{display:flex;align-items:center;gap:10px;padding:16px 18px;border-bottom:1px solid var(--line)}
.dlg-h b{flex:1;font-size:17px}
.dlg-b{padding:16px 18px;overflow:auto}
.dlg-f{padding:12px 18px;border-top:1px solid var(--line);display:flex;gap:8px;justify-content:flex-end}
.pick{display:flex;gap:12px;align-items:center;padding:8px;border-radius:12px;cursor:pointer}
.pick:hover{background:var(--panel2)}
.pick .meta{flex:1;min-width:0}
.pick small{color:var(--ink3)}
.chip{display:inline-flex;gap:6px;align-items:center;background:rgba(79,70,229,.1);color:var(--brand-ink);border-radius:999px;padding:4px 10px;font-size:13px;margin:0 6px 6px 0}
.chip button{border:0;background:none;padding:0;font-size:14px;color:inherit}
.check{width:22px;height:22px;border-radius:7px;border:2px solid var(--line);display:grid;place-items:center;color:#fff;font-size:13px;flex:none}
.check.on{background:var(--brand);border-color:var(--brand)}
.lightbox{position:fixed;inset:0;background:rgba(0,0,0,.9);display:grid;place-items:center;z-index:60;cursor:zoom-out}
.lightbox img{max-width:96vw;max-height:94vh;border-radius:8px}
#toast-root{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);z-index:70;display:grid;gap:8px}
.toast{background:#0f172a;color:#fff;padding:10px 16px;border-radius:12px;font-size:14px;box-shadow:0 10px 30px rgba(0,0,0,.25);animation:rise .2s}
.toast.err{background:#b91c1c}

/* ---------- điện thoại ---------- */
@media (max-width: 860px){
  .auth{grid-template-columns:1fr}
  .auth-hero{padding:28px 22px}
  .auth-hero h1{font-size:30px;margin-top:18px}
  .auth-hero .feat{display:none}
  .shell,.embed .shell{grid-template-columns:1fr}
  .rail{display:none}
  .chat{display:none}
  .shell.in-chat .list{display:none}
  .shell.in-chat .chat{display:flex}
  .back{display:grid}
  .m{max-width:88%}
  .acts{display:none!important}
  .msgs{padding:12px 10px 6px}
}

/* ---------- cuộc gọi ---------- */
.av.xl{width:120px;height:120px;font-size:44px;box-shadow:0 0 0 8px rgba(255,255,255,.08),0 0 0 18px rgba(255,255,255,.04)}
.call{position:fixed;inset:0;z-index:80;isolation:isolate;background:radial-gradient(120% 90% at 50% 0%,#312e81 0%,#0b1020 60%,#05070f 100%);color:#fff;display:flex;flex-direction:column;align-items:center;justify-content:space-between;padding:calc(18px + env(safe-area-inset-top)) 16px calc(26px + env(safe-area-inset-bottom))}
.call video#call-remote{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;background:#000;display:none}
.call.has-video video#call-remote{display:block}
.call.has-video .call-peer{display:none}
.call-top{position:relative;z-index:2;width:100%;display:flex;justify-content:space-between;gap:10px;font-size:12.5px;opacity:.85;flex-wrap:wrap}
.call-brand{font-weight:700}
@media (max-width:600px){.call-top{flex-direction:column;gap:2px}}
.call-peer{position:relative;z-index:2;text-align:center;margin-top:8vh}
.call-peer .av{margin:0 auto}
.call-peer h2{margin:22px 0 6px;font-size:26px;letter-spacing:-.3px}
.call-status{opacity:.85;font-size:15px}
.call.has-video .call-top{background:linear-gradient(rgba(0,0,0,.55),transparent);margin:-18px -16px 0;padding:18px 16px 30px;width:calc(100% + 32px)}
#call-local{position:absolute;z-index:3;right:16px;top:calc(56px + env(safe-area-inset-top));width:min(28vw,180px);aspect-ratio:3/4;object-fit:cover;border-radius:16px;background:#111;box-shadow:0 10px 30px rgba(0,0,0,.45);transform:scaleX(-1)}
#call-local.off{display:none}
.call-ctrls{position:relative;z-index:3;display:flex;gap:18px;justify-content:center;flex-wrap:wrap}
.cb{width:66px;height:66px;border-radius:50%;border:0;background:rgba(255,255,255,.16);backdrop-filter:blur(8px);color:#fff;font-size:24px;display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative}
.cb small{position:absolute;top:72px;font-size:11.5px;white-space:nowrap;opacity:.9}
.cb.off{background:#fff;color:#0f172a}
.cb.red{background:#ef4444}
.cb.green{background:#22c55e}
.cb.pulse{animation:ring 1.2s infinite}
@keyframes ring{0%{box-shadow:0 0 0 0 rgba(34,197,94,.6)}70%{box-shadow:0 0 0 22px rgba(34,197,94,0)}100%{box-shadow:0 0 0 0 rgba(34,197,94,0)}}
.call-ctrls{margin-bottom:22px}
.callmsg{align-self:center;display:flex;align-items:center;gap:10px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:8px 12px;margin:8px 0;font-size:13.5px;box-shadow:0 1px 2px rgba(15,23,42,.05)}
.callmsg small{color:var(--ink3)}
.callmsg.missed span{color:var(--danger);font-weight:600}
.callmsg button{border:0;background:rgba(79,70,229,.1);color:var(--brand);border-radius:10px;padding:5px 10px;font-weight:600;font-size:12.5px}
.call-btn{font-size:18px}
a.rail-btn{text-decoration:none}
/* thanh mời bật thông báo đẩy (góc dưới màn hình) */
.push-bar{position:fixed;left:50%;bottom:18px;transform:translateX(-50%);z-index:900;display:flex;align-items:center;gap:12px;max-width:min(560px,calc(100vw - 24px));width:max-content;
  background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:18px;padding:12px 12px 12px 16px;box-shadow:0 18px 50px rgba(15,23,42,.25);animation:pbIn .35s ease}
.push-bar .pb-ic{font-size:26px;animation:pbRing 1.6s ease-in-out infinite;transform-origin:50% 10%}
.push-bar .pb-tx{font-size:13.5px;line-height:1.35;color:var(--ink2)}
.push-bar .pb-tx b{color:var(--ink)}
.push-bar .btn{white-space:nowrap;padding:10px 14px}
.push-bar .pb-x{border:0;background:transparent;color:var(--ink3);font-size:16px;padding:6px;cursor:pointer}
@keyframes pbIn{from{opacity:0;transform:translate(-50%,20px)}to{opacity:1;transform:translate(-50%,0)}}
@keyframes pbRing{0%,60%,100%{transform:rotate(0)}10%,30%,50%{transform:rotate(-14deg)}20%,40%{transform:rotate(14deg)}}
@media (max-width:560px){.push-bar{bottom:10px;padding:10px;gap:8px}.push-bar .pb-tx{font-size:12.5px}}