/* ==========================================================================
   BlueTalk – common styles
   ========================================================================== */
:root{
  --bt-primary:#1877f2;
  --bt-primary-dark:#0b5ed7;
  --bt-primary-darker:#084298;
  --bt-primary-light:#e8f1ff;
  --bt-accent:#4fa3ff;
  --bt-bg:#eef4fb;
  --bt-white:#ffffff;
  --bt-text:#1b2733;
  --bt-text-light:#6b7c93;
  --bt-border:#dbe6f3;
  --bt-bubble-me:#cfe6ff;
  --bt-bubble-other:#ffffff;
  --bt-danger:#ff5a5f;
  --bt-online:#33c46c;
  --radius:14px;
  font-size:16px;
}

*{box-sizing:border-box;}
html,body{height:100%;}
body{
  margin:0;
  font-family:"Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic",Meiryo,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  background:var(--bt-bg);
  color:var(--bt-text);
}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;cursor:pointer;}
img{max-width:100%;}
::-webkit-scrollbar{width:8px;height:8px;}
::-webkit-scrollbar-thumb{background:#c3d7ee;border-radius:8px;}
::-webkit-scrollbar-track{background:transparent;}

/* ---------- Auth pages ---------- */
.auth-page{
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  background:linear-gradient(160deg,var(--bt-primary) 0%,var(--bt-primary-dark) 45%,#063c85 100%);
  padding:20px;
}
.auth-card{
  background:var(--bt-white);
  width:100%;
  max-width:400px;
  border-radius:20px;
  padding:36px 32px 28px;
  box-shadow:0 20px 60px rgba(8,42,98,0.35);
}
.auth-logo{
  display:flex;
  flex-direction:column;
  align-items:center;
  margin-bottom:22px;
}
.auth-logo .logo-badge{
  width:64px;height:64px;border-radius:20px;
  background:linear-gradient(135deg,var(--bt-primary),var(--bt-primary-darker));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:30px;margin-bottom:10px;
  box-shadow:0 8px 20px rgba(24,119,242,0.35);
}
.auth-logo h1{margin:0;font-size:24px;color:var(--bt-primary-darker);letter-spacing:1px;}
.auth-logo p{margin:4px 0 0;color:var(--bt-text-light);font-size:13px;}
.auth-tabs{display:flex;background:var(--bt-bg);border-radius:12px;padding:4px;margin-bottom:20px;}
.auth-tabs button{
  flex:1;border:none;background:transparent;padding:10px 0;border-radius:10px;
  font-weight:600;color:var(--bt-text-light);font-size:14px;transition:.2s;
}
.auth-tabs button.active{background:var(--bt-white);color:var(--bt-primary);box-shadow:0 2px 6px rgba(0,0,0,0.08);}
.auth-form{display:none;flex-direction:column;gap:14px;}
.auth-form.active{display:flex;}
.field{display:flex;flex-direction:column;gap:6px;}
.field label{font-size:12px;color:var(--bt-text-light);font-weight:600;}
.field input{
  border:1.5px solid var(--bt-border);border-radius:10px;padding:11px 14px;
  font-size:15px;outline:none;transition:.15s;background:#fbfdff;
}
.field input:focus{border-color:var(--bt-primary);background:#fff;}
.btn-primary{
  background:linear-gradient(135deg,var(--bt-primary),var(--bt-primary-dark));
  color:#fff;border:none;border-radius:10px;padding:12px;font-size:15px;font-weight:700;
  margin-top:4px;box-shadow:0 6px 16px rgba(24,119,242,0.3);
}
.btn-primary:hover{filter:brightness(1.05);}
.btn-secondary{
  background:var(--bt-primary-light);color:var(--bt-primary-darker);border:none;border-radius:10px;
  padding:12px;font-size:14px;font-weight:700;
}
.form-msg{font-size:13px;color:var(--bt-danger);min-height:16px;text-align:center;}
.avatar-picker{display:flex;align-items:center;gap:12px;}
.avatar-picker img{width:52px;height:52px;border-radius:50%;object-fit:cover;background:var(--bt-bg);border:1px solid var(--bt-border);}

/* ---------- App shell ---------- */
.app-shell{
  display:flex;
  height:100vh;
  overflow:hidden;
}
.nav-rail{
  width:76px;background:linear-gradient(180deg,var(--bt-primary-darker),var(--bt-primary-dark));
  display:flex;flex-direction:column;align-items:center;padding:18px 0;flex-shrink:0;
}
.nav-rail .brand{
  width:44px;height:44px;border-radius:14px;background:rgba(255,255,255,0.15);
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:20px;margin-bottom:26px;
}
.nav-rail nav{display:flex;flex-direction:column;gap:6px;flex:1;width:100%;align-items:center;}
.nav-item{
  width:56px;height:56px;border-radius:16px;display:flex;flex-direction:column;align-items:center;justify-content:center;
  color:rgba(255,255,255,0.65);gap:3px;background:transparent;border:none;font-size:11px;transition:.15s;
}
.nav-item i{font-size:19px;}
.nav-item.active{background:rgba(255,255,255,0.18);color:#fff;}
.nav-item:hover{color:#fff;}
.nav-rail .me-avatar{
  width:42px;height:42px;border-radius:50%;object-fit:cover;border:2px solid rgba(255,255,255,0.5);margin-top:10px;cursor:pointer;
}

.list-panel{
  width:340px;background:var(--bt-white);border-right:1px solid var(--bt-border);
  display:flex;flex-direction:column;flex-shrink:0;
}
.list-panel .panel-header{
  padding:18px 18px 12px;display:flex;align-items:center;justify-content:space-between;
}
.panel-header h2{margin:0;font-size:19px;}
.panel-header .icon-btn{
  width:34px;height:34px;border-radius:50%;border:none;background:var(--bt-primary-light);color:var(--bt-primary);font-size:15px;
}
.search-box{margin:0 18px 12px;position:relative;}
.search-box input{
  width:100%;padding:9px 14px 9px 34px;border-radius:20px;border:1px solid var(--bt-border);background:var(--bt-bg);font-size:14px;outline:none;
}
.search-box i{position:absolute;left:13px;top:50%;transform:translateY(-50%);color:var(--bt-text-light);font-size:13px;}
.scroll-list{flex:1;overflow-y:auto;padding-bottom:10px;}

.chat-row{
  display:flex;align-items:center;gap:12px;padding:11px 18px;cursor:pointer;border-left:3px solid transparent;transition:.12s;
}
.chat-row:hover{background:var(--bt-bg);}
.chat-row.active{background:var(--bt-primary-light);border-left-color:var(--bt-primary);}
.chat-row img{width:48px;height:48px;border-radius:50%;object-fit:cover;background:var(--bt-bg);flex-shrink:0;}
.chat-row .info{flex:1;min-width:0;}
.chat-row .info .top{display:flex;justify-content:space-between;align-items:baseline;}
.chat-row .info .name{font-weight:700;font-size:14.5px;}
.chat-row .info .time{font-size:11px;color:var(--bt-text-light);flex-shrink:0;}
.chat-row .info .preview{font-size:12.5px;color:var(--bt-text-light);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}

.friend-row{display:flex;align-items:center;gap:12px;padding:10px 18px;}
.friend-row img{width:44px;height:44px;border-radius:50%;object-fit:cover;background:var(--bt-bg);}
.friend-row .info{flex:1;min-width:0;}
.friend-row .info .name{font-weight:700;font-size:14px;}
.friend-row .info .status{font-size:12px;color:var(--bt-text-light);}
.friend-row .row-actions{display:flex;gap:6px;}
.mini-btn{
  border:none;background:var(--bt-primary-light);color:var(--bt-primary);border-radius:8px;padding:7px 9px;font-size:13px;
}
.mini-btn.danger{background:#ffe6e7;color:var(--bt-danger);}
.section-label{padding:12px 18px 4px;font-size:12px;color:var(--bt-text-light);font-weight:700;}

.main-panel{flex:1;display:flex;flex-direction:column;min-width:0;background:var(--bt-bg);}
.empty-state{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--bt-text-light);gap:12px;
}
.empty-state i{font-size:60px;color:#c7d9ee;}

/* ---- Chat room ---- */
.chat-room{display:flex;flex-direction:column;height:100%;}
.chat-header{
  height:64px;background:var(--bt-white);border-bottom:1px solid var(--bt-border);
  display:flex;align-items:center;gap:12px;padding:0 20px;flex-shrink:0;
}
.chat-header img{width:38px;height:38px;border-radius:50%;object-fit:cover;}
.chat-header .title{font-weight:700;font-size:15px;flex:1;}
.chat-header .actions{display:flex;gap:8px;}
.chat-header .actions button{
  width:38px;height:38px;border-radius:50%;border:none;background:var(--bt-primary-light);color:var(--bt-primary);font-size:16px;
}
.messages{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:10px;}
.msg-row{display:flex;gap:8px;max-width:70%;}
.msg-row.me{align-self:flex-end;flex-direction:row-reverse;}
.msg-row img.avatar{width:30px;height:30px;border-radius:50%;object-fit:cover;flex-shrink:0;}
.msg-bubble{
  background:var(--bt-bubble-other);padding:10px 14px;border-radius:16px;font-size:14.5px;line-height:1.5;
  box-shadow:0 1px 3px rgba(0,0,0,0.06);word-break:break-word;
}
.msg-row.me .msg-bubble{background:var(--bt-bubble-me);}
.msg-meta{display:flex;flex-direction:column;justify-content:flex-end;}
.msg-time{font-size:10.5px;color:var(--bt-text-light);margin:0 6px;white-space:nowrap;}
.msg-sticker img{width:120px;border-radius:10px;}
.msg-call-log{
  align-self:center;background:#fff;color:var(--bt-text-light);font-size:12.5px;padding:6px 14px;border-radius:14px;
  display:flex;align-items:center;gap:6px;
}
.chat-input-bar{
  border-top:1px solid var(--bt-border);background:var(--bt-white);padding:12px 16px;display:flex;align-items:flex-end;gap:10px;flex-shrink:0;position:relative;
}
.chat-input-bar textarea{
  flex:1;resize:none;border:1.5px solid var(--bt-border);border-radius:18px;padding:10px 16px;font-size:14.5px;max-height:100px;outline:none;font-family:inherit;
}
.chat-input-bar textarea:focus{border-color:var(--bt-primary);}
.round-btn{
  width:40px;height:40px;border-radius:50%;border:none;background:var(--bt-primary-light);color:var(--bt-primary);font-size:17px;flex-shrink:0;
}
.round-btn.send{background:var(--bt-primary);color:#fff;}
.round-btn.send:disabled{background:#c9dcf5;}

/* sticker picker popover */
.sticker-picker{
  position:absolute;bottom:64px;left:16px;width:320px;max-height:320px;overflow-y:auto;background:#fff;border-radius:14px;
  box-shadow:0 10px 30px rgba(0,0,0,0.18);padding:12px;display:none;grid-template-columns:repeat(3,1fr);gap:10px;border:1px solid var(--bt-border);
}
.sticker-picker.open{display:grid;}
.sticker-picker .sticker-item{cursor:pointer;border-radius:10px;padding:6px;text-align:center;background:var(--bt-bg);}
.sticker-picker .sticker-item img{width:100%;height:70px;object-fit:contain;}
.sticker-picker .sticker-item span{display:block;font-size:10.5px;color:var(--bt-text-light);margin-top:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.sticker-picker .empty-hint{grid-column:1/-1;text-align:center;color:var(--bt-text-light);font-size:13px;padding:20px 0;}

/* ---- Sticker shop panel ---- */
.sticker-shop{padding:24px;overflow-y:auto;flex:1;}
.sticker-shop h2{margin-top:0;}
.add-sticker-card{
  background:#fff;border-radius:16px;padding:20px;margin-bottom:22px;box-shadow:0 2px 10px rgba(20,60,120,0.06);
}
.add-sticker-card .row{display:flex;gap:10px;}
.add-sticker-card input{
  flex:1;border:1.5px solid var(--bt-border);border-radius:10px;padding:10px 14px;font-size:14px;outline:none;
}
.add-sticker-card input:focus{border-color:var(--bt-primary);}
.add-sticker-card p.hint{font-size:12px;color:var(--bt-text-light);margin:10px 0 0;line-height:1.6;}
.sticker-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:14px;}
.sticker-card{background:#fff;border-radius:14px;padding:12px;text-align:center;box-shadow:0 2px 8px rgba(20,60,120,0.06);position:relative;}
.sticker-card img{width:100%;height:90px;object-fit:contain;}
.sticker-card .name{font-size:12px;margin-top:6px;color:var(--bt-text-light);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.sticker-card .del{
  position:absolute;top:4px;right:4px;width:22px;height:22px;border-radius:50%;border:none;background:#ffe6e7;color:var(--bt-danger);font-size:11px;
}

/* ---- Profile ---- */
.profile-panel{padding:36px;overflow-y:auto;flex:1;}
.profile-card{
  background:#fff;border-radius:18px;padding:28px;max-width:420px;box-shadow:0 2px 10px rgba(20,60,120,0.06);
}
.profile-card .avatar-row{display:flex;align-items:center;gap:16px;margin-bottom:18px;}
.profile-card .avatar-row img{width:76px;height:76px;border-radius:50%;object-fit:cover;background:var(--bt-bg);}
.profile-card .uid{color:var(--bt-text-light);font-size:13px;}

/* ---- Incoming call toast / call overlay ---- */
.incoming-call-toast{
  position:fixed;top:20px;right:20px;background:#fff;border-radius:16px;box-shadow:0 12px 40px rgba(0,0,0,0.25);
  padding:16px 18px;display:none;align-items:center;gap:14px;z-index:999;min-width:280px;
}
.incoming-call-toast.show{display:flex;}
.incoming-call-toast img{width:48px;height:48px;border-radius:50%;object-fit:cover;}
.incoming-call-toast .info{flex:1;}
.incoming-call-toast .info .name{font-weight:700;font-size:14px;}
.incoming-call-toast .info .sub{font-size:12px;color:var(--bt-text-light);}
.incoming-call-toast .actions{display:flex;gap:8px;}
.incoming-call-toast .actions button{width:38px;height:38px;border-radius:50%;border:none;color:#fff;font-size:15px;}
.incoming-call-toast .accept{background:var(--bt-online);}
.incoming-call-toast .reject{background:var(--bt-danger);}

.call-overlay{
  position:fixed;inset:0;background:linear-gradient(160deg,#0b2545,#153b6f);z-index:1000;display:none;flex-direction:column;align-items:center;justify-content:center;color:#fff;
}
.call-overlay.show{display:flex;}
.call-overlay .call-avatar{width:110px;height:110px;border-radius:50%;object-fit:cover;border:3px solid rgba(255,255,255,0.4);margin-bottom:18px;}
.call-overlay .call-name{font-size:22px;font-weight:700;}
.call-overlay .call-status{font-size:14px;color:#bcd6ff;margin-top:6px;}
.call-overlay video{border-radius:14px;background:#000;}
.call-overlay #remoteVideo{width:70%;max-width:640px;margin-top:16px;}
.call-overlay #localVideo{position:absolute;bottom:120px;right:30px;width:160px;border-radius:10px;border:2px solid #fff;}
.call-controls{display:flex;gap:20px;margin-top:36px;}
.call-controls button{
  width:58px;height:58px;border-radius:50%;border:none;font-size:20px;color:#fff;background:rgba(255,255,255,0.15);
}
.call-controls .end-call{background:var(--bt-danger);}
.call-controls button.toggled-off{background:#fff;color:#0b2545;}

.toast-msg{
  position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#1b2733;color:#fff;padding:10px 20px;border-radius:20px;
  font-size:13px;z-index:1200;opacity:0;transition:.25s;pointer-events:none;
}
.toast-msg.show{opacity:1;}

/* modal */
.modal-backdrop{position:fixed;inset:0;background:rgba(10,25,50,0.45);display:none;align-items:center;justify-content:center;z-index:900;}
.modal-backdrop.show{display:flex;}
.modal-box{background:#fff;border-radius:16px;padding:24px;width:340px;max-height:80vh;overflow-y:auto;box-shadow:0 20px 50px rgba(0,0,0,0.3);}
.modal-box h3{margin-top:0;}
.modal-box .close-x{float:right;border:none;background:transparent;font-size:16px;color:var(--bt-text-light);}

/* responsive */
@media (max-width:900px){
  .list-panel{width:100%;}
  .app-shell.chat-open .list-panel{display:none;}
  .app-shell:not(.chat-open) .main-panel{display:none;}
  .nav-rail{width:64px;}
  .back-btn{display:flex !important;}
}