/* ============================================================
   ItnaOne Messenger-Style Chat UI V1.0.0
   iPhone Safari/PWA + Android Chrome/PWA + Tablet + Desktop
   Loaded LAST. No backend/message/call logic is replaced.
   ============================================================ */

:root{
  --itna-msg-blue:#0a7cff;
  --itna-msg-blue-2:#0866ff;
  --itna-msg-ink:#111827;
  --itna-msg-muted:#8994a6;
  --itna-msg-line:#e5ebf3;
  --itna-msg-in:#f0f2f5;
  --itna-msg-panel:#ffffff;
  --itna-msg-soft:#f7f9fc;
  --itna-msg-shadow:0 16px 44px rgba(32,63,105,.10);
  --itna-msg-vh:100dvh;
}

/* ----- Page / shell ----- */
body.itna-messenger-final .rt-messenger-page{
  width:100%!important;
  max-width:1180px!important;
  margin:0 auto!important;
  box-sizing:border-box!important;
}

body.itna-messenger-final .rt-messenger-shell{
  overflow:hidden!important;
  border:1px solid #dce5f0!important;
  border-radius:28px!important;
  background:#fff!important;
  box-shadow:var(--itna-msg-shadow)!important;
}

body.itna-messenger-final .rt-messenger-chat-main{
  min-width:0!important;
  background:#fff!important;
}

/* ----- Conversation header ----- */
body.itna-messenger-final .rt-room-head{
  position:relative!important;
  z-index:5!important;
  display:flex!important;
  align-items:center!important;
  min-height:82px!important;
  padding:12px 16px!important;
  gap:11px!important;
  border:0!important;
  border-bottom:1px solid var(--itna-msg-line)!important;
  background:rgba(255,255,255,.96)!important;
  backdrop-filter:blur(18px)!important;
  -webkit-backdrop-filter:blur(18px)!important;
  box-sizing:border-box!important;
}

body.itna-messenger-final .rt-room-back{
  flex:0 0 auto!important;
  display:grid!important;
  place-items:center!important;
  width:42px!important;
  height:42px!important;
  margin:0!important;
  padding:0!important;
  border:0!important;
  border-radius:50%!important;
  background:transparent!important;
  color:#34445a!important;
  text-decoration:none!important;
}

body.itna-messenger-final .rt-room-back svg{
  width:25px!important;
  height:25px!important;
  fill:none!important;
  stroke:currentColor!important;
  stroke-width:2!important;
  stroke-linecap:round!important;
  stroke-linejoin:round!important;
}

body.itna-messenger-final .rt-room-person{
  display:flex!important;
  align-items:center!important;
  flex:1 1 auto!important;
  min-width:0!important;
  gap:10px!important;
}

body.itna-messenger-final .rt-room-person .rt-avatar,
body.itna-messenger-final .rt-room-head .rt-avatar{
  width:48px!important;
  height:48px!important;
  min-width:48px!important;
  border-radius:50%!important;
  background:linear-gradient(135deg,#1b72f5,#42a7ff)!important;
  color:#fff!important;
  box-shadow:0 7px 17px rgba(24,119,242,.18)!important;
  font-size:16px!important;
  font-weight:800!important;
}

body.itna-messenger-final .rt-room-person>div:last-child{
  min-width:0!important;
}

body.itna-messenger-final .rt-room-person strong{
  display:block!important;
  max-width:100%!important;
  overflow:hidden!important;
  color:#151b26!important;
  font-size:17px!important;
  line-height:1.18!important;
  font-weight:800!important;
  text-overflow:ellipsis!important;
  white-space:nowrap!important;
}

body.itna-messenger-final .rt-room-person small{
  display:block!important;
  margin-top:3px!important;
  max-width:100%!important;
  overflow:hidden!important;
  color:#8a95a6!important;
  font-size:12px!important;
  line-height:1.2!important;
  text-overflow:ellipsis!important;
  white-space:nowrap!important;
}

body.itna-messenger-final .rt-call-actions,
body.itna-messenger-final .rt-messenger-call-actions{
  display:flex!important;
  align-items:center!important;
  flex:0 0 auto!important;
  gap:7px!important;
  margin-left:auto!important;
}

body.itna-messenger-final .rt-call-actions select{
  display:none!important;
}

body.itna-messenger-final .rt-call-actions button,
body.itna-messenger-final .rt-call-icon-btn{
  display:grid!important;
  place-items:center!important;
  width:44px!important;
  height:44px!important;
  min-width:44px!important;
  margin:0!important;
  padding:0!important;
  border:1px solid #d9e3ef!important;
  border-radius:15px!important;
  background:#fff!important;
  color:var(--itna-msg-blue-2)!important;
  box-shadow:0 5px 14px rgba(31,68,119,.055)!important;
}

body.itna-messenger-final .rt-call-actions button svg,
body.itna-messenger-final .rt-call-icon-btn svg{
  width:22px!important;
  height:22px!important;
}

/* ----- Message stage ----- */
body.itna-messenger-final .rt-messenger-messages,
body.itna-messenger-final .rt-messages{
  display:flex!important;
  flex-direction:column!important;
  min-width:0!important;
  min-height:420px!important;
  overflow-y:auto!important;
  overflow-x:hidden!important;
  overscroll-behavior-y:contain!important;
  -webkit-overflow-scrolling:touch!important;
  scroll-behavior:smooth!important;
  padding:24px 20px 28px!important;
  gap:6px!important;
  background:
    radial-gradient(circle at 12% 0%,rgba(15,117,255,.035),transparent 28%),
    #fff!important;
  box-sizing:border-box!important;
}

/* Incoming bubble */
body.itna-messenger-final .rt-message{
  align-self:flex-start!important;
  width:auto!important;
  max-width:min(72%,600px)!important;
  margin:0!important;
  padding:10px 13px 8px!important;
  border:0!important;
  border-radius:20px 20px 20px 7px!important;
  background:var(--itna-msg-in)!important;
  color:#171d27!important;
  box-shadow:none!important;
  font-size:15px!important;
  line-height:1.35!important;
  word-break:break-word!important;
  overflow-wrap:anywhere!important;
  box-sizing:border-box!important;
}

/* Outgoing bubble */
body.itna-messenger-final .rt-message.mine{
  align-self:flex-end!important;
  border-radius:20px 20px 7px 20px!important;
  background:linear-gradient(135deg,var(--itna-msg-blue-2),#2588ff)!important;
  color:#fff!important;
}

/* Timestamps */
body.itna-messenger-final .rt-message small{
  display:block!important;
  margin-top:4px!important;
  color:inherit!important;
  font-size:10px!important;
  line-height:1.15!important;
  opacity:.50!important;
}

/* ----- Composer ----- */
body.itna-messenger-final .rt-messenger-message-form{
  position:relative!important;
  z-index:6!important;
  display:grid!important;
  grid-template-columns:42px minmax(0,1fr) 38px 48px!important;
  align-items:end!important;
  width:100%!important;
  min-width:0!important;
  gap:7px!important;
  margin:0!important;
  padding:11px 13px calc(11px + env(safe-area-inset-bottom,0px))!important;
  border:0!important;
  border-top:1px solid var(--itna-msg-line)!important;
  background:rgba(255,255,255,.97)!important;
  backdrop-filter:blur(18px)!important;
  -webkit-backdrop-filter:blur(18px)!important;
  box-sizing:border-box!important;
}

body.itna-messenger-final .itna-msg-plus,
body.itna-messenger-final .itna-msg-emoji{
  display:grid!important;
  place-items:center!important;
  margin:0!important;
  padding:0!important;
  border:0!important;
  border-radius:50%!important;
  background:transparent!important;
  color:var(--itna-msg-blue-2)!important;
  cursor:pointer!important;
  box-sizing:border-box!important;
}

body.itna-messenger-final .itna-msg-plus{
  width:42px!important;
  height:42px!important;
  background:linear-gradient(135deg,#0876ff,#258cff)!important;
  color:#fff!important;
  box-shadow:0 6px 15px rgba(8,102,255,.18)!important;
}

body.itna-messenger-final .itna-msg-emoji{
  width:38px!important;
  height:38px!important;
  align-self:center!important;
}

body.itna-messenger-final .itna-msg-plus svg,
body.itna-messenger-final .itna-msg-emoji svg{
  width:22px!important;
  height:22px!important;
  fill:none!important;
  stroke:currentColor!important;
  stroke-width:2!important;
  stroke-linecap:round!important;
  stroke-linejoin:round!important;
}

body.itna-messenger-final .rt-message-input-shell{
  min-width:0!important;
  width:100%!important;
  margin:0!important;
  padding:0 5px!important;
  overflow:hidden!important;
  border:1px solid #dbe4ef!important;
  border-radius:24px!important;
  background:#f7f9fc!important;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.72)!important;
  box-sizing:border-box!important;
}

body.itna-messenger-final .rt-messenger-message-form textarea,
body.itna-messenger-final #rtMessageInput{
  display:block!important;
  width:100%!important;
  max-width:100%!important;
  min-width:0!important;
  min-height:44px!important;
  max-height:132px!important;
  margin:0!important;
  padding:11px 10px!important;
  overflow-y:auto!important;
  border:0!important;
  outline:0!important;
  border-radius:22px!important;
  background:transparent!important;
  box-shadow:none!important;
  color:#111827!important;
  font-family:inherit!important;
  font-size:16px!important; /* prevents iOS input zoom */
  line-height:1.35!important;
  resize:none!important;
  box-sizing:border-box!important;
}

body.itna-messenger-final #rtMessageInput::placeholder{
  color:#9aa3b1!important;
  opacity:1!important;
}

/* Existing send button remains functional */
body.itna-messenger-final .rt-messenger-message-form>button[type="submit"],
body.itna-messenger-final .rt-messenger-message-form>button:not(.itna-msg-plus):not(.itna-msg-emoji){
  display:grid!important;
  place-items:center!important;
  width:48px!important;
  height:48px!important;
  min-width:48px!important;
  margin:0!important;
  padding:0!important;
  border:0!important;
  border-radius:16px!important;
  background:linear-gradient(135deg,#0876ff,#258cff)!important;
  color:#fff!important;
  box-shadow:0 8px 19px rgba(8,102,255,.22)!important;
  cursor:pointer!important;
  box-sizing:border-box!important;
}

body.itna-messenger-final .rt-messenger-message-form>button[type="submit"] svg{
  width:22px!important;
  height:22px!important;
}

body.itna-messenger-final .rt-messenger-message-form>button:disabled{
  opacity:.55!important;
}

/* ----- Conversation list polish ----- */
body.itna-messenger-final .rt-messenger-conversation{
  border-radius:18px!important;
  transition:background .15s ease,transform .15s ease!important;
}

body.itna-messenger-final .rt-messenger-conversation:hover{
  background:#f4f7fb!important;
}

body.itna-messenger-final .rt-messenger-conversation.active{
  background:#eaf3ff!important;
}

body.itna-messenger-final .rt-messenger-avatar{
  background:linear-gradient(135deg,#1b72f5,#42a7ff)!important;
}

/* ----- Tablet ----- */
@media(max-width:1024px){
  body.itna-messenger-final .rt-messenger-page{
    max-width:100%!important;
  }
}

/* ============================================================
   PHONE EXPERIENCE — SAME STRUCTURE ON IOS + ANDROID
   ============================================================ */
@media(max-width:760px){
  html,
  body.itna-messenger-final{
    overflow-x:hidden!important;
  }

  /* Active conversation becomes app-like fullscreen. */
  body.itna-messenger-final.rt-native-room-mode .mail-app-topbar,
  body.itna-messenger-final.rt-native-room-mode .mail-mobile-dock,
  body.itna-messenger-final.rt-native-room-mode .bottom-nav,
  body.itna-messenger-final.rt-native-room-mode .mobile-nav,
  body.itna-messenger-final.rt-native-room-mode .mail-bottom-nav{
    display:none!important;
  }

  body.itna-messenger-final.rt-native-room-mode .itnaone-view-stage,
  body.itna-messenger-final.rt-native-room-mode .mail-app-shell,
  body.itna-messenger-final.rt-native-room-mode .rt-messenger-page,
  body.itna-messenger-final.rt-native-room-mode .rt-messenger-shell,
  body.itna-messenger-final.rt-native-room-mode .rt-messenger-chat-main{
    width:100%!important;
    max-width:100%!important;
    min-width:0!important;
    margin:0!important;
    padding:0!important;
  }

  body.itna-messenger-final.rt-native-room-mode .itnaone-view-stage{
    min-height:var(--itna-msg-vh,100dvh)!important;
    background:#fff!important;
  }

  body.itna-messenger-final.rt-native-room-mode .rt-messenger-page.has-conversation{
    padding:0!important;
  }

  body.itna-messenger-final.rt-native-room-mode .rt-messenger-shell{
    display:block!important;
    height:var(--itna-msg-vh,100dvh)!important;
    min-height:var(--itna-msg-vh,100dvh)!important;
    overflow:hidden!important;
    border:0!important;
    border-radius:0!important;
    box-shadow:none!important;
    background:#fff!important;
  }

  body.itna-messenger-final.rt-native-room-mode .rt-messenger-sidebar{
    display:none!important;
  }

  body.itna-messenger-final.rt-native-room-mode .rt-messenger-chat-main{
    display:grid!important;
    grid-template-rows:auto minmax(0,1fr) auto!important;
    height:var(--itna-msg-vh,100dvh)!important;
    min-height:0!important;
    overflow:hidden!important;
    background:#fff!important;
  }

  body.itna-messenger-final .rt-room-head{
    min-height:74px!important;
    padding:
      calc(9px + env(safe-area-inset-top,0px))
      11px
      9px!important;
    gap:8px!important;
  }

  body.itna-messenger-final .rt-room-back{
    width:38px!important;
    height:38px!important;
  }

  body.itna-messenger-final .rt-room-person{
    gap:8px!important;
  }

  body.itna-messenger-final .rt-room-person .rt-avatar,
  body.itna-messenger-final .rt-room-head .rt-avatar{
    width:44px!important;
    height:44px!important;
    min-width:44px!important;
    font-size:15px!important;
  }

  body.itna-messenger-final .rt-room-person strong{
    font-size:16px!important;
  }

  body.itna-messenger-final .rt-room-person small{
    font-size:11px!important;
  }

  body.itna-messenger-final .rt-call-actions,
  body.itna-messenger-final .rt-messenger-call-actions{
    gap:5px!important;
  }

  body.itna-messenger-final .rt-call-actions button,
  body.itna-messenger-final .rt-call-icon-btn{
    width:40px!important;
    height:40px!important;
    min-width:40px!important;
    border-radius:13px!important;
  }

  body.itna-messenger-final .rt-messenger-messages,
  body.itna-messenger-final .rt-messages{
    min-height:0!important;
    max-height:none!important;
    height:auto!important;
    padding:16px 14px 20px!important;
    gap:5px!important;
    overflow-y:auto!important;
    scroll-padding-bottom:18px!important;
  }

  body.itna-messenger-final .rt-message{
    max-width:78%!important;
    padding:9px 12px 8px!important;
    border-radius:19px 19px 19px 6px!important;
    font-size:15px!important;
  }

  body.itna-messenger-final .rt-message.mine{
    border-radius:19px 19px 6px 19px!important;
  }

  body.itna-messenger-final .rt-messenger-message-form{
    position:relative!important;
    bottom:auto!important;
    grid-template-columns:40px minmax(0,1fr) 36px 46px!important;
    gap:5px!important;
    padding:
      8px
      9px
      calc(8px + env(safe-area-inset-bottom,0px))!important;
    border-top:1px solid #e4eaf2!important;
  }

  body.itna-messenger-final .itna-msg-plus{
    width:40px!important;
    height:40px!important;
  }

  body.itna-messenger-final .itna-msg-emoji{
    width:36px!important;
    height:36px!important;
  }

  body.itna-messenger-final .rt-message-input-shell{
    border-radius:22px!important;
  }

  body.itna-messenger-final #rtMessageInput{
    min-height:42px!important;
    max-height:116px!important;
    padding:10px 8px!important;
    font-size:16px!important;
  }

  body.itna-messenger-final .rt-messenger-message-form>button[type="submit"],
  body.itna-messenger-final .rt-messenger-message-form>button:not(.itna-msg-plus):not(.itna-msg-emoji){
    width:46px!important;
    height:46px!important;
    min-width:46px!important;
    border-radius:14px!important;
  }

  /* Keyboard-open mode: remove extra browser/PWA bottom padding. */
  body.itna-messenger-final.itna-keyboard-open .rt-messenger-message-form{
    padding-bottom:7px!important;
  }
}

/* Narrow phones */
@media(max-width:390px){
  body.itna-messenger-final .rt-room-head{
    padding-left:8px!important;
    padding-right:8px!important;
  }

  body.itna-messenger-final .rt-room-back{
    width:34px!important;
    height:34px!important;
  }

  body.itna-messenger-final .rt-room-person .rt-avatar,
  body.itna-messenger-final .rt-room-head .rt-avatar{
    width:40px!important;
    height:40px!important;
    min-width:40px!important;
  }

  body.itna-messenger-final .rt-call-actions button,
  body.itna-messenger-final .rt-call-icon-btn{
    width:37px!important;
    height:37px!important;
    min-width:37px!important;
  }

  body.itna-messenger-final .rt-messenger-message-form{
    grid-template-columns:36px minmax(0,1fr) 34px 43px!important;
    gap:4px!important;
    padding-left:7px!important;
    padding-right:7px!important;
  }

  body.itna-messenger-final .itna-msg-plus{
    width:36px!important;
    height:36px!important;
  }

  body.itna-messenger-final .itna-msg-emoji{
    width:34px!important;
    height:34px!important;
  }

  body.itna-messenger-final .rt-messenger-message-form>button[type="submit"],
  body.itna-messenger-final .rt-messenger-message-form>button:not(.itna-msg-plus):not(.itna-msg-emoji){
    width:43px!important;
    height:43px!important;
    min-width:43px!important;
  }
}

@media(prefers-reduced-motion:reduce){
  body.itna-messenger-final .rt-messenger-conversation,
  body.itna-messenger-final .rt-messenger-messages,
  body.itna-messenger-final .rt-messages{
    scroll-behavior:auto!important;
    transition:none!important;
  }
}