:root{
  --bg:#0a0d14; --panel:#0f1117; --panel2:#12141c; --card:#161a26;
  --b1:#1e2130; --b2:#2d3148; --b3:#3a3f55;
  --text:#e7ecf3; --dim:#94a3b8; --faint:#64748b;
  --blue:#60a5fa; --purple:#a78bfa; --green:#4ade80; --green2:#22c55e; --amber:#fbbf24; --red:#f87171;
  --grad:linear-gradient(135deg,#60a5fa,#a78bfa);
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font-family:"Segoe UI",system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);
  overflow:hidden;-webkit-font-smoothing:antialiased}
svg{display:block}
.hidden{display:none !important}

/* ───────── Login ───────── */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;
  background:radial-gradient(60% 50% at 18% 8%,rgba(96,165,250,.13),transparent 60%),
             radial-gradient(55% 50% at 85% 92%,rgba(167,139,250,.13),transparent 60%),var(--bg)}
.login-card{width:380px;background:var(--panel);border:1px solid var(--b1);border-radius:16px;
  padding:30px 30px 26px;box-shadow:0 24px 70px rgba(0,0,0,.55)}
.login-brand{display:flex;flex-direction:column;align-items:center;gap:12px;margin-bottom:22px}
.mk{width:50px;height:50px;border-radius:13px;background:var(--grad);display:flex;align-items:center;
  justify-content:center;color:#fff;font-weight:800;font-size:18px;box-shadow:0 8px 22px rgba(96,165,250,.32)}
.login-brand .bn{text-align:center}
.login-brand .bn .t{font-weight:700;font-size:17px}
.login-brand .bn .s{font-size:12px;color:var(--dim);margin-top:1px}
.login-card h1{font-size:16px;font-weight:700;text-align:center;margin-bottom:5px}
.login-lead{font-size:12.5px;color:var(--faint);text-align:center;margin-bottom:22px}
.field{margin-bottom:14px}
.field label{display:block;font-size:11.5px;font-weight:600;color:var(--dim);margin-bottom:7px}
.input{display:flex;align-items:center;gap:10px;background:var(--bg);border:1px solid var(--b2);border-radius:10px;padding:11px 13px}
.input:focus-within{border-color:#3b5b8a;box-shadow:0 0 0 3px rgba(59,91,138,.18)}
.input svg{width:17px;height:17px;color:var(--faint);flex-shrink:0}
.input input{flex:1;background:transparent;border:0;outline:none;color:var(--text);font-size:13.5px;font-family:inherit}
.input input::placeholder{color:var(--faint)}
.input .eye{color:var(--faint);cursor:pointer}
.btn-primary{width:100%;margin-top:8px;background:var(--grad);color:#fff;border:0;font-weight:700;font-size:14px;
  padding:12px;border-radius:10px;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px}
.btn-primary:hover{filter:brightness(1.07)}
.btn-primary:disabled{opacity:.6;cursor:default;filter:none}
.login-foot{margin-top:20px;text-align:center;font-size:11px;color:var(--faint);display:flex;align-items:center;justify-content:center;gap:6px}
.login-foot svg{width:13px;height:13px}
.err{display:flex;align-items:center;gap:8px;background:#2a1416;border:1px solid #7f1d1d;color:#fca5a5;
  font-size:12px;border-radius:9px;padding:9px 12px;margin-bottom:14px}
.err svg{width:16px;height:16px;flex-shrink:0}

/* ───────── App shell ───────── */
.app{display:flex;height:100vh}
.sidebar{width:236px;flex-shrink:0;background:#0b0e16;border-right:1px solid var(--b1);display:flex;flex-direction:column;padding:16px 12px}
.brand{display:flex;align-items:center;gap:10px;padding:6px 8px 18px}
.brand-mark{width:34px;height:34px;border-radius:9px;background:var(--grad);display:flex;align-items:center;
  justify-content:center;font-size:13px;font-weight:800;color:#fff}
.brand-name{font-weight:700;font-size:15px;line-height:1.15}
.brand-name span{display:block;font-size:11px;font-weight:600;color:var(--dim)}
.nav-label{font-size:10.5px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--faint);padding:8px 10px 6px}
.nav-item{display:flex;align-items:center;gap:11px;padding:9px 11px;border-radius:9px;color:var(--dim);font-size:13.5px;font-weight:600;cursor:pointer}
.nav-item svg{width:18px;height:18px;color:var(--dim)}
.nav-item.active{background:rgba(96,165,250,.13);color:#cfe0ff;box-shadow:inset 2px 0 0 var(--blue)}
.nav-item.active svg{color:var(--blue)}
.nav-badge{margin-left:auto;background:var(--green2);color:#04210f;font-size:11px;font-weight:800;min-width:19px;height:19px;
  padding:0 5px;border-radius:99px;display:flex;align-items:center;justify-content:center}
.nav-badge:empty{display:none}
.side-foot{margin-top:auto;border-top:1px solid var(--b1);padding-top:12px}
.me{display:flex;align-items:center;gap:10px;padding:6px 8px}
.me-av{width:30px;height:30px;border-radius:50%;background:#1e2740;color:var(--blue);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px}
.me-info{font-size:12.5px;font-weight:600;line-height:1.2;min-width:0}
.me-info span{display:block;font-size:11px;color:var(--faint);font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.logout{margin-top:8px;width:100%;text-align:left;padding:8px 10px;border-radius:8px;background:transparent;border:1px solid var(--b2);
  color:var(--dim);font-size:12.5px;font-weight:600;cursor:pointer;display:flex;gap:9px;align-items:center}
.logout svg{width:16px;height:16px}
.logout:hover{background:#15182280;color:var(--text)}

.main{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{height:54px;flex-shrink:0;background:var(--panel);border-bottom:1px solid var(--b1);display:flex;align-items:center;padding:0 20px;gap:12px}
.topbar h1{font-size:15px;font-weight:700}
.topbar .sub{font-size:12px;color:var(--faint)}
.topbar-right{margin-left:auto;display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--dim)}
.dot-live{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(74,222,128,.18)}
.inbox{flex:1;display:flex;min-height:0}

/* thread list */
.threads{width:340px;flex-shrink:0;border-right:1px solid var(--b1);display:flex;flex-direction:column;background:var(--panel2)}
.search-wrap{padding:12px 14px 8px;border-bottom:1px solid var(--b1)}
.search{display:flex;align-items:center;gap:8px;background:var(--bg);border:1px solid var(--b2);border-radius:9px;padding:8px 11px}
.search:focus-within{border-color:#3b5b8a}
.search svg{width:15px;height:15px;color:var(--faint)}
.search input{flex:1;background:transparent;border:0;outline:none;color:var(--text);font-size:13px;font-family:inherit}
.search input::placeholder{color:var(--faint)}
.threads-sub{font-size:11px;color:var(--faint);padding:8px 16px 4px;font-weight:600;letter-spacing:.04em;text-transform:uppercase}
.tlist{overflow-y:auto;flex:1}
.thread{display:flex;gap:12px;padding:12px 16px;cursor:pointer;border-bottom:1px solid #14161f;position:relative}
.thread:hover{background:#141823}
.thread.active{background:#161b2b;box-shadow:inset 3px 0 0 var(--blue)}
.av{width:38px;height:38px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;color:#fff}
.t-body{flex:1;min-width:0}
.t-top{display:flex;align-items:baseline;gap:8px}
.t-name{font-size:13.5px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1}
.t-time{font-size:11px;color:var(--faint);flex-shrink:0}
.t-snip{font-size:12.5px;color:var(--dim);margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;line-height:1.4;display:flex;align-items:center;gap:5px}
.t-snip .clip{color:var(--faint);flex-shrink:0}
.thread.unread .t-name{color:#fff;font-weight:700}
.thread.unread .t-snip{color:#c7d2e0;font-weight:500}
.t-unread{position:absolute;right:14px;bottom:13px;background:var(--green2);color:#04210f;font-size:10.5px;font-weight:800;
  min-width:18px;height:18px;padding:0 5px;border-radius:99px;display:flex;align-items:center;justify-content:center}

/* conversation */
.convo{flex:1;display:flex;flex-direction:column;min-width:0;background:var(--bg)}
.convo-empty{flex:1;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:10px;color:var(--faint);font-size:13.5px}
.convo-empty svg{width:42px;height:42px;color:var(--b3)}
.convo-head{padding:11px 20px;border-bottom:1px solid var(--b1);display:flex;align-items:center;gap:12px}
.convo-head .av{width:36px;height:36px;font-size:13px}
.ch-name{font-size:14px;font-weight:700}
.ch-mail2{font-size:12px;color:var(--faint);margin-top:1px}
.ch-via{margin-left:auto;font-size:10.5px;color:var(--faint);border:1px solid var(--b2);padding:3px 9px;border-radius:99px}
.stream{flex:1;overflow-y:auto;padding:18px 24px 22px;display:flex;flex-direction:column;gap:7px}
.rootdiv{display:flex;align-items:center;gap:10px;color:var(--faint);margin:12px 2px 6px;font-size:11px}
.rootdiv::before,.rootdiv::after{content:"";flex:1;height:1px;background:var(--b1)}
.rootdiv b{font-weight:600;color:#9fb0c7}
.row{display:flex;flex-direction:column;margin:7px 0}
.row.in{align-items:flex-start}.row.out{align-items:flex-end}
.row.reply.in{padding-left:30px}.row.reply.out{padding-right:30px}
.msg{max-width:74%;position:relative}
.bubble{border-radius:14px;font-size:13.5px;line-height:1.6;overflow:hidden}
.in .bubble{background:var(--card);border:1px solid var(--b2);border-top-left-radius:5px;color:#dce3ee}
.out .bubble{background:linear-gradient(135deg,#24355f,#3a2c63);border:1px solid #4b3d7a;border-top-right-radius:5px;color:#eef1fb}
.msg.target .bubble{box-shadow:0 0 0 2px var(--green2),0 0 18px rgba(34,197,94,.25)}
.refstrip{display:flex;align-items:center;gap:7px;padding:7px 13px;font-size:11px;color:var(--dim);background:rgba(255,255,255,.025);border-bottom:1px dashed var(--b2)}
.refstrip .who{font-weight:700;color:#cdd7e5;flex-shrink:0}
.refstrip .q{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;opacity:.85}
.esubj{display:flex;align-items:center;gap:8px;padding:9px 13px;font-size:12.5px;font-weight:700;color:#eef3fa;border-bottom:1px solid var(--b2)}
.out .esubj{border-bottom-color:#4b3d7a}
.esubj .tag{font-size:9.5px;font-weight:800;letter-spacing:.05em;color:#0a0d14;background:var(--dim);padding:2px 6px;border-radius:5px;flex-shrink:0}
.out .esubj .tag{background:#93c5fd}
.esubj .subjtext{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.esubj .changed{margin-left:auto;font-size:9.5px;font-weight:700;color:var(--amber);border:1px solid #78591a;background:#3a2c0c;padding:2px 7px;border-radius:99px;flex-shrink:0}
.ebody{padding:11px 13px 12px;word-break:break-word}
.ebody p{margin:0 0 9px}.ebody p:last-child{margin-bottom:0}
.ebody ul,.ebody ol{margin:7px 0 3px;padding-left:20px}.ebody li{margin:3px 0}
.ebody a{color:#93c5fd;font-weight:600}.out .ebody a{color:#bfdbfe}
.ebody img{max-width:100%;border-radius:6px;margin:4px 0}
.ebody blockquote{border-left:3px solid var(--b3);margin:6px 0;padding:2px 0 2px 12px;color:var(--dim)}
.footrow{display:flex;align-items:center;gap:10px;margin-top:5px;padding:0 4px}
.row.out .footrow{flex-direction:row-reverse}
.meta{font-size:10.5px;color:var(--faint)}
.replybtn{font-size:10.5px;font-weight:700;color:var(--blue);cursor:pointer;opacity:.55;display:flex;align-items:center;gap:4px;background:none;border:0;font-family:inherit}
.msg:hover .replybtn{opacity:1}

/* attachments */
.atts{display:flex;flex-wrap:wrap;gap:8px;margin-top:11px}
.att-file{display:inline-flex;align-items:center;gap:10px;background:#0f1422;border:1px solid var(--b2);border-radius:9px;padding:8px 11px;min-width:170px;max-width:240px;text-decoration:none}
.att-file .fico{width:30px;height:30px;border-radius:7px;background:#1e2740;color:#93c5fd;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;flex-shrink:0;text-transform:uppercase}
.att-file .meta2{min-width:0;flex:1;line-height:1.35}
.att-file .meta2 .nm{font-size:12px;font-weight:600;color:#dce3ee;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.att-file .meta2 .sz{font-size:11px;color:var(--faint)}
.att-file .dl{color:var(--blue);flex-shrink:0;font-size:14px}
.att-file.disabled{opacity:.6}
/* image attachment thumbnails */
.att-thumb{display:flex;flex-direction:column;width:172px;background:#0d1018;border:1px solid var(--b2);border-radius:9px;overflow:hidden;cursor:pointer;padding:0;font-family:inherit;text-align:left}
.att-thumb:hover{border-color:#3b5b8a}
.att-thumb-img{height:104px;background:#0b1220;display:flex;align-items:center;justify-content:center;overflow:hidden}
.att-thumb-img img{width:100%;height:100%;object-fit:cover;display:block}
.att-thumb-img .thumb-fail{font-size:11px;color:var(--faint)}
.att-thumb-cap{display:flex;align-items:center;gap:7px;padding:7px 9px;font-size:11.5px}
.att-thumb-cap .nm{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:#dce3ee;font-weight:600}
.att-thumb-cap .sz{color:var(--faint);flex-shrink:0}
/* lightbox image viewer */
.lightbox{position:fixed;inset:0;z-index:100;background:rgba(5,7,12,.86);display:flex;align-items:center;justify-content:center;flex-direction:column;gap:12px;padding:40px}
.lightbox img{max-width:90vw;max-height:80vh;border-radius:8px;box-shadow:0 20px 60px #000c}
.lightbox-cap{color:#cbd5e1;font-size:13px}
.lightbox-close{position:absolute;top:18px;right:22px;width:38px;height:38px;border-radius:50%;background:#161a26;border:1px solid var(--b2);color:#e7ecf3;font-size:20px;cursor:pointer;display:flex;align-items:center;justify-content:center}
.lightbox-close:hover{background:#1e2334}

/* composer */
.composer{flex-shrink:0;border-top:1px solid var(--b1);padding:12px 20px 14px;background:var(--panel)}
.reply-ctx{display:flex;align-items:center;gap:9px;background:#10182a;border:1px solid #294066;border-left:3px solid var(--green2);
  border-radius:8px;padding:7px 11px;margin-bottom:9px;font-size:12px}
.reply-ctx .lbl{color:var(--green);font-weight:700;flex-shrink:0}
.reply-ctx .sub{color:#cdd7e5;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.reply-ctx .by{color:var(--faint);flex-shrink:0}
.reply-ctx .x{margin-left:auto;color:var(--faint);cursor:pointer;font-size:14px;font-weight:700;flex-shrink:0;background:none;border:0}
.comp-box{background:var(--bg);border:1px solid var(--b2);border-radius:12px;padding:10px 12px;display:flex;flex-direction:column;gap:9px}
.comp-box:focus-within{border-color:#3b5b8a}
.subj-row{display:flex;align-items:center;gap:9px;border-bottom:1px solid var(--b2);padding-bottom:9px}
.subj-row .lbl{font-size:10.5px;font-weight:700;color:var(--faint);text-transform:uppercase;letter-spacing:.05em;flex-shrink:0}
.subj-row input{flex:1;background:transparent;border:0;outline:none;color:var(--text);font-size:13px;font-weight:600;font-family:inherit}
.comp-box textarea{background:transparent;border:0;resize:none;color:var(--text);font-family:inherit;font-size:13.5px;line-height:1.5;min-height:42px;max-height:180px;outline:none}
.comp-box textarea::placeholder{color:var(--faint)}
.att-row{display:flex;flex-wrap:wrap;gap:7px}
.att-row:empty{display:none}
.att-chip{display:inline-flex;align-items:center;gap:8px;background:#10182a;border:1px solid #294066;border-radius:8px;padding:6px 10px;font-size:11.5px;color:#cdd7e5}
.att-chip .ic{width:22px;height:22px;border-radius:5px;background:#1e2740;color:#93c5fd;display:flex;align-items:center;justify-content:center;font-size:9px;font-weight:800;text-transform:uppercase}
.att-chip .nm{font-weight:600;max-width:150px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.att-chip .sz{color:var(--faint)}.att-chip .rm{color:var(--faint);cursor:pointer;font-weight:700;padding-left:2px}
.comp-bar{display:flex;align-items:center;gap:10px}
.comp-hint{font-size:11px;color:var(--faint);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.btn-attach{background:transparent;border:1px solid var(--b2);color:var(--dim);font-weight:600;font-size:12.5px;padding:8px 13px;border-radius:9px;cursor:pointer;display:flex;align-items:center;gap:7px}
.btn-attach:hover{color:var(--text)}
.send{margin-left:auto;background:var(--grad);color:#fff;border:0;font-weight:700;font-size:13px;padding:9px 20px;border-radius:9px;cursor:pointer;display:flex;align-items:center;gap:8px}
.send:hover{filter:brightness(1.07)}
.send:disabled{opacity:.6;cursor:default;filter:none}

/* spinner + empty + toast */
.spinner{width:16px;height:16px;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}
.spinner.dark{border-color:rgba(96,165,250,.25);border-top-color:var(--blue)}
@keyframes spin{to{transform:rotate(360deg)}}
.center-state{flex:1;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:12px;color:var(--faint);font-size:13px;padding:30px;text-align:center}
.list-empty{padding:40px 20px;text-align:center;color:var(--faint);font-size:12.5px;line-height:1.6}
.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:#2a1416;border:1px solid #7f1d1d;color:#fca5a5;
  font-size:13px;padding:11px 16px;border-radius:10px;box-shadow:0 10px 30px #0008;z-index:50}

@media (max-width:760px){
  .sidebar{width:64px;padding:16px 8px}
  .brand-name,.nav-item span,.me-info,.logout span,.nav-label{display:none}
  .nav-item{justify-content:center}
  .threads{width:240px}
}