:root{
  --bg: #0E1116;
  --surface: #161B22;
  --elevated: #1F2733;
  --accent: #5B8CFF;
  --accent-soft: rgba(91,140,255,.16);
  --mint: #7CE0C4;
  --text: #E6E8EB;
  --text-dim: #8B94A3;
  --text-faint: #565F6E;
  --danger: #FF6B6B;
  --border: rgba(255,255,255,.06);
  --radius: 18px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html,body{height:100%;}
body{
  background:#05070a;
  font-family:'Inter',sans-serif;
  color:var(--text);
  overflow:hidden;
}
button{font-family:inherit;}
input, textarea{font-family:inherit;}
::selection{ background: var(--accent-soft); }

.hidden{display:none !important;}

/* ---------------- AUTH SCREEN ---------------- */
.auth-wrap{
  height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:20px;
}
.auth-card{
  width:100%;
  max-width:380px;
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:24px;
  padding:36px 30px;
}
.auth-logo{
  font-family:'Manrope',sans-serif;
  font-weight:800;
  font-size:26px;
  letter-spacing:-.5px;
  margin-bottom:6px;
  display:flex;
  align-items:center;
  gap:10px;
}
.auth-logo .dot{width:10px;height:10px;border-radius:50%;background:var(--accent);}
.auth-sub{color:var(--text-dim);font-size:13.5px;margin-bottom:26px;}
.field{margin-bottom:14px;}
.field label{display:block;font-size:12px;color:var(--text-faint);font-weight:600;margin-bottom:6px;letter-spacing:.3px;text-transform:uppercase;}
.field input{
  width:100%;
  background:var(--elevated);
  border:1px solid var(--border);
  border-radius:14px;
  padding:12px 14px;
  color:var(--text);
  font-size:14.5px;
  outline:none;
  transition:.15s;
}
.field input:focus{border-color:var(--accent);}
.auth-btn{
  width:100%;
  background:var(--accent);
  color:#fff;
  border:none;
  border-radius:14px;
  padding:13px;
  font-weight:700;
  font-family:'Manrope',sans-serif;
  font-size:14.5px;
  cursor:pointer;
  margin-top:6px;
  transition:.15s;
}
.auth-btn:hover{filter:brightness(1.08);}
.auth-btn:disabled{opacity:.6;cursor:default;}
.auth-switch{
  text-align:center;
  margin-top:18px;
  font-size:13px;
  color:var(--text-dim);
}
.auth-switch a{color:var(--accent);cursor:pointer;font-weight:600;text-decoration:none;}
.auth-error{
  background:rgba(255,107,107,.1);
  border:1px solid rgba(255,107,107,.3);
  color:var(--danger);
  padding:10px 13px;
  border-radius:12px;
  font-size:13px;
  margin-bottom:14px;
}

/* ---------------- APP SHELL ---------------- */
.app{
  height:100vh;
  display:flex;
}

/* Sidebar (chat list) */
.sidebar{
  width:380px;
  flex:0 0 auto;
  background:var(--bg);
  border-right:1px solid var(--border);
  display:flex;
  flex-direction:column;
  min-width:0;
}
.topbar{
  padding:20px 20px 14px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex:0 0 auto;
}
.topbar h1{
  font-family:'Manrope',sans-serif;
  font-size:24px;
  font-weight:800;
  letter-spacing:-.5px;
}
.icon-btn{
  width:38px;height:38px;
  border-radius:12px;
  background:var(--surface);
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;
  border:1px solid var(--border);
  transition:.15s;
  flex:0 0 auto;
}
.icon-btn:hover{background:var(--elevated);}
.icon-btn svg{width:18px;height:18px;stroke:var(--text);}

.search-wrap{padding:0 20px 14px;flex:0 0 auto;}
.search{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:14px;
  display:flex;align-items:center;gap:10px;
  padding:11px 14px;
}
.search svg{width:16px;height:16px;stroke:var(--text-faint);flex:0 0 auto;}
.search input{background:none;border:none;outline:none;color:var(--text);font-size:14px;width:100%;}
.search input::placeholder{color:var(--text-faint);}

.chat-list{flex:1;overflow-y:auto;padding:0 12px 14px;}
.chat-list::-webkit-scrollbar{width:6px;}
.chat-list::-webkit-scrollbar-thumb{background:var(--elevated);border-radius:6px;}
.chat-row{
  display:flex;align-items:center;gap:13px;
  padding:11px 10px;border-radius:16px;cursor:pointer;transition:.12s;
}
.chat-row:hover{background:var(--surface);}
.chat-row.active{background:var(--elevated);}
.chat-meta{flex:1;min-width:0;}
.chat-top-row{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:3px;gap:8px;}
.chat-name{font-family:'Manrope',sans-serif;font-weight:700;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.chat-time{font-size:11px;color:var(--text-faint);flex:0 0 auto;}
.chat-bottom-row{display:flex;justify-content:space-between;align-items:center;gap:8px;}
.chat-preview{font-size:13px;color:var(--text-dim);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.chat-preview.typing{color:var(--accent);font-weight:600;}
.unread-badge{
  background:var(--accent);color:#fff;font-size:11px;font-weight:700;
  min-width:20px;height:20px;border-radius:10px;
  display:flex;align-items:center;justify-content:center;padding:0 6px;flex:0 0 auto;
  font-family:'Manrope',sans-serif;
}
.empty-hint{padding:30px 24px;color:var(--text-faint);font-size:13.5px;text-align:center;line-height:1.5;}

/* avatar ring */
.avatar-ring{position:relative;flex:0 0 auto;display:flex;align-items:center;justify-content:center;}
.avatar-ring::before{
  content:'';position:absolute;inset:-3px;border-radius:50%;
  background:conic-gradient(from 0deg, var(--accent), var(--mint), var(--accent));
  opacity:0;
}
.avatar-ring.online::before{opacity:1;animation:spin 3.5s linear infinite;}
@keyframes spin{to{transform:rotate(360deg);}}
.avatar-ring .letter{
  position:relative;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-family:'Manrope',sans-serif;font-weight:700;
  border:3px solid var(--bg);z-index:1;
}
.chat-row .avatar-ring .letter{width:52px;height:52px;font-size:17px;}

/* Main panel */
.main{
  flex:1;
  display:flex;
  flex-direction:column;
  min-width:0;
  background:var(--bg);
}
.main-empty{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  color:var(--text-faint);gap:10px;
}
.main-empty .logo{font-family:'Manrope',sans-serif;font-weight:800;font-size:22px;color:var(--text-dim);}

.chat-header{
  display:flex;align-items:center;gap:12px;
  padding:16px 22px;
  border-bottom:1px solid var(--border);
  flex:0 0 auto;
}
.chat-header .who{flex:1;min-width:0;cursor:pointer;}
.chat-header .who h3{font-family:'Manrope',sans-serif;font-size:15.5px;font-weight:700;}
.chat-header .who p{font-size:12px;color:var(--text-faint);margin-top:1px;}
.chat-header .who p.is-typing{color:var(--mint);font-style:normal;}
.chat-header .avatar-ring .letter{width:40px;height:40px;font-size:14px;}
.header-actions{display:flex;gap:8px;}
.back-btn-mobile{display:none;}

.messages{
  flex:1;overflow-y:auto;padding:22px 8%;
  display:flex;flex-direction:column;gap:4px;
}
.messages::-webkit-scrollbar{width:6px;}
.messages::-webkit-scrollbar-thumb{background:var(--elevated);border-radius:6px;}
.date-chip{
  align-self:center;background:var(--surface);color:var(--text-dim);
  font-size:11px;font-weight:600;padding:5px 12px;border-radius:10px;margin:10px 0 16px;
}
.msg-row{display:flex;max-width:60%;margin-bottom:10px;}
.msg-row.in{align-self:flex-start;}
.msg-row.out{align-self:flex-end;}
.bubble{padding:10px 14px 8px;border-radius:18px;font-size:14.5px;line-height:1.45;position:relative;word-wrap:break-word;white-space:pre-wrap;}
.msg-row.in .bubble{background:var(--surface);border-bottom-left-radius:5px;}
.msg-row.out .bubble{background:linear-gradient(135deg, var(--accent), #4A6FE0);color:#fff;border-bottom-right-radius:5px;}
.bubble .meta{display:flex;justify-content:flex-end;align-items:center;gap:4px;margin-top:4px;font-size:10.5px;opacity:.65;}
.bubble img.att{display:block;max-width:280px;max-height:320px;width:100%;height:auto;object-fit:cover;border-radius:12px;margin-bottom:6px;cursor:pointer;}
.att-file{
  display:flex;align-items:center;gap:10px;
  padding:8px 10px;margin-bottom:6px;
  background:rgba(0,0,0,.14);border-radius:12px;
  color:inherit;text-decoration:none;min-width:180px;max-width:240px;
}
.msg-row.in .att-file{background:rgba(255,255,255,.05);}
.att-file .att-file-icon{
  flex:0 0 auto;width:34px;height:34px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:rgba(255,255,255,.14);font-size:16px;
}
.att-file .att-file-info{min-width:0;flex:1;}
.att-file .att-file-name{
  font-weight:600;font-size:13.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
  text-decoration:none;
}
.att-file .att-file-size{font-size:11px;opacity:.7;margin-top:1px;}
.msg-row.in .sender-label{font-size:11.5px;font-weight:700;color:var(--mint);margin-bottom:2px;display:block;}

.typing-indicator{
  align-self:flex-start;background:var(--surface);border-radius:18px;border-bottom-left-radius:5px;
  padding:13px 16px;display:flex;gap:4px;margin-bottom:10px;
}
.typing-indicator span{width:6px;height:6px;border-radius:50%;background:var(--text-faint);animation:bounce 1.2s infinite ease-in-out;}
.typing-indicator span:nth-child(2){animation-delay:.15s;}
.typing-indicator span:nth-child(3){animation-delay:.3s;}
@keyframes bounce{0%,60%,100%{transform:translateY(0);opacity:.5;}30%{transform:translateY(-4px);opacity:1;}}

.composer{
  display:flex;align-items:center;gap:8px;padding:14px 22px;border-top:1px solid var(--border);flex:0 0 auto;
}
.composer .icon-btn{width:38px;height:38px;}
.composer-input{
  flex:1;background:var(--surface);border:1px solid var(--border);border-radius:20px;
  padding:11px 16px;color:var(--text);font-size:14.5px;outline:none;resize:none;max-height:120px;
}
.composer-input::placeholder{color:var(--text-faint);}
.send-btn{
  width:38px;height:38px;border-radius:50%;background:var(--accent);
  display:flex;align-items:center;justify-content:center;cursor:pointer;flex:0 0 auto;border:none;transition:.15s;
}
.send-btn:hover{filter:brightness(1.08);}
.send-btn svg{width:16px;height:16px;stroke:#fff;fill:#fff;}

/* Info / profile panel (slide-over) */
.overlay-panel{
  position:fixed;top:0;right:0;bottom:0;width:360px;
  background:var(--bg);border-left:1px solid var(--border);
  transform:translateX(100%);transition:transform .28s cubic-bezier(.22,.9,.32,1);
  z-index:30;display:flex;flex-direction:column;
}
.overlay-panel.open{transform:translateX(0);}
.overlay-backdrop{
  position:fixed;inset:0;background:rgba(0,0,0,.4);opacity:0;pointer-events:none;transition:.2s;z-index:29;
}
.overlay-backdrop.open{opacity:1;pointer-events:auto;}
.panel-head{display:flex;align-items:center;justify-content:space-between;padding:16px 18px;border-bottom:1px solid var(--border);flex:0 0 auto;}
.panel-body{flex:1;overflow-y:auto;padding:18px 0 30px;}

.profile-hero{display:flex;flex-direction:column;align-items:center;padding:14px 20px 24px;text-align:center;}
.profile-hero .avatar-ring{margin-bottom:14px;}
.profile-hero .avatar-ring .letter{width:88px;height:88px;font-size:30px;}
.profile-hero h2{font-family:'Manrope',sans-serif;font-size:20px;font-weight:800;}
.profile-hero p.handle{color:var(--text-dim);font-size:13px;margin-top:3px;}
.profile-hero p.status{color:var(--mint);font-size:12.5px;margin-top:8px;font-weight:600;}

.info-section{padding:0 20px;margin-bottom:20px;}
.info-section h4{font-size:11.5px;text-transform:uppercase;letter-spacing:.6px;color:var(--text-faint);font-weight:700;margin-bottom:10px;padding-left:4px;}
.info-card{background:var(--surface);border:1px solid var(--border);border-radius:16px;overflow:hidden;}
.info-row{display:flex;align-items:center;gap:13px;padding:13px 16px;border-bottom:1px solid var(--border);cursor:pointer;}
.info-row:last-child{border-bottom:none;}
.info-row svg{width:18px;height:18px;stroke:var(--text-dim);flex:0 0 auto;}
.info-row .txt{flex:1;min-width:0;}
.info-row .txt .label{font-size:14px;font-weight:600;}
.info-row .txt .sub{font-size:12px;color:var(--text-faint);margin-top:2px;}
.info-row.danger .label{color:var(--danger);}
.info-row.danger svg{stroke:var(--danger);}
.info-row input{background:none;border:none;outline:none;color:var(--text);font-size:14px;font-weight:600;width:100%;}

.member-row{display:flex;align-items:center;gap:12px;padding:9px 4px;}
.member-row .avatar-ring .letter{width:40px;height:40px;font-size:14px;}
.member-row .txt{flex:1;}
.member-row .txt .name{font-size:14px;font-weight:700;font-family:'Manrope',sans-serif;}
.member-row .txt .role{font-size:11.5px;color:var(--text-faint);margin-top:1px;}
.role-tag{font-size:10.5px;font-weight:700;color:var(--mint);background:rgba(124,224,196,.12);padding:3px 9px;border-radius:8px;}
.member-row input[type=checkbox]{width:18px;height:18px;accent-color:var(--accent);}

.new-chat-search{padding:14px 20px;}
.user-pick-row{display:flex;align-items:center;gap:12px;padding:10px 16px;cursor:pointer;border-radius:12px;}
.user-pick-row:hover{background:var(--surface);}

.primary-btn{
  background:var(--accent);color:#fff;text-align:center;padding:13px;border-radius:16px;
  font-weight:700;font-family:'Manrope',sans-serif;cursor:pointer;border:none;width:100%;font-size:14px;
}
.primary-btn:disabled{opacity:.5;cursor:default;}

/* Mobile layout */
@media (max-width: 860px){
  .sidebar{width:100%;}
  .main{position:fixed;inset:0;transform:translateX(100%);transition:transform .25s;background:var(--bg);}
  .app.chat-open .sidebar{display:none;}
  .app.chat-open .main{transform:translateX(0);}
  .back-btn-mobile{display:flex;}
  .overlay-panel{width:100%;}
  .msg-row{max-width:82%;}
  .messages{padding:18px 5%;}
}