/* ============================================================
   epiChat 2.0 — Design System & Styles
   High-performance responsive CSS for Mobile & Desktop
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Inter:wght@400;500;600;700&display=swap');

/* ── Reset ───────────────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;overflow:hidden;-webkit-text-size-adjust:100%;touch-action:manipulation}

/* ── Design Tokens — Dark ────────────────────────────────────────── */
:root{
  --font:'Plus Jakarta Sans','Inter',-apple-system,BlinkMacSystemFont,sans-serif;
  --bg-app:#0F172A;
  --bg-sidebar:#0B1120;
  --bg-panel:#0F172A;
  --bg-chat:#090E17;
  --bg-bubble-out:#312E81;
  --bg-bubble-in:#1E293B;
  --bg-input:#1E293B;
  --bg-hover:rgba(255,255,255,0.06);
  --bg-active:rgba(99,102,241,0.18);
  --bg-card:#1E293B;
  --text-primary:#F8FAFC;
  --text-secondary:#94A3B8;
  --text-muted:#64748B;
  --accent:#6366F1;
  --accent-dark:#4F46E5;
  --accent-cyan:#06B6D4;
  --accent-glow:rgba(99,102,241,0.35);
  --border:rgba(255,255,255,0.08);
  --shadow-sm:0 2px 8px rgba(0,0,0,0.3);
  --shadow-md:0 8px 32px rgba(0,0,0,0.4);
  --shadow-lg:0 20px 60px rgba(0,0,0,0.55);
  --online:#10B981;
  --danger:#EF4444;
  --r-sm:8px;--r-md:14px;--r-lg:22px;--r-xl:30px;
  --t:.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ── Light Theme ─────────────────────────────────────────────────── */
body.light{
  --bg-app:#F1F5F9;--bg-sidebar:#FFFFFF;--bg-panel:#FFFFFF;
  --bg-chat:#E2E8F0;--bg-bubble-out:#E0E7FF;--bg-bubble-in:#FFFFFF;
  --bg-input:#F8FAFC;--bg-hover:rgba(0,0,0,0.04);
  --bg-active:rgba(99,102,241,0.12);--bg-card:#FFFFFF;
  --text-primary:#0F172A;--text-secondary:#64748B;--text-muted:#94A3B8;
  --border:rgba(0,0,0,0.08);
  --shadow-sm:0 2px 8px rgba(0,0,0,0.08);
  --shadow-md:0 8px 32px rgba(0,0,0,0.12);
}

/* ── Base ────────────────────────────────────────────────────────── */
body{font-family:var(--font);font-size:14px;color:var(--text-primary);
  background:var(--bg-app);-webkit-font-smoothing:antialiased}
button{cursor:pointer;border:none;background:none;color:inherit;font-family:inherit;touch-action:manipulation}
input,textarea{font-family:inherit;color:inherit;outline:none;border:none;background:none}
a{color:var(--accent);text-decoration:none}
.hidden{display:none!important}

/* Scrollbars */
::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(255,255,255,0.16);border-radius:4px}
body.light ::-webkit-scrollbar-thumb{background:rgba(0,0,0,0.18)}

/* ═══════════════════════════════════════════════════════════
   AUTH SCREEN
═══════════════════════════════════════════════════════════════ */
#auth-screen{
  position:fixed;inset:0;display:flex;align-items:center;
  justify-content:center;z-index:1000;overflow:hidden;padding:16px}
.auth-bg{position:absolute;inset:0;
  background:radial-gradient(ellipse at top, #1E1B4B 0%, #0F172A 70%);
  animation:bgPulse 10s ease-in-out infinite}
@keyframes bgPulse{
  0%,100%{background:radial-gradient(ellipse at top, #1E1B4B 0%, #0F172A 70%)}
  50%{background:radial-gradient(ellipse at bottom, #0E2A3B 0%, #0B1120 70%)}}
.auth-bubble{position:absolute;border-radius:50%;filter:blur(80px);
  animation:floatBubble 14s ease-in-out infinite;pointer-events:none}
.auth-bubble.b1{width:520px;height:520px;background:rgba(99,102,241,.18);
  top:-120px;left:-120px;animation-delay:0s}
.auth-bubble.b2{width:420px;height:420px;background:rgba(6,182,212,.14);
  bottom:-90px;right:-90px;animation-delay:4s}
.auth-bubble.b3{width:320px;height:320px;background:rgba(139,92,246,.12);
  top:45%;left:45%;animation-delay:8s}
@keyframes floatBubble{0%,100%{transform:translateY(0) scale(1)}
  50%{transform:translateY(-35px) scale(1.06)}}

.auth-card{
  position:relative;z-index:1;
  background:rgba(30,41,59,.88);backdrop-filter:blur(24px);
  -webkit-backdrop-filter:blur(24px);border:1px solid var(--border);
  border-radius:var(--r-xl);padding:44px 36px 36px;
  width:100%;max-width:430px;box-shadow:var(--shadow-lg);
  animation:cardIn .55s cubic-bezier(.34,1.56,.64,1)}
body.light .auth-card{background:rgba(255,255,255,.95)}
@keyframes cardIn{from{opacity:0;transform:translateY(25px) scale(.96)}
  to{opacity:1;transform:translateY(0) scale(1)}}

.auth-logo{display:flex;flex-direction:column;align-items:center;margin-bottom:28px}
.auth-brand-name{
  font-size:26px;font-weight:800;letter-spacing:-0.5px;
  background:linear-gradient(135deg,#6366F1,#A855F7,#06B6D4);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  margin-top:12px;text-align:center}

.auth-step{display:none;animation:stepIn .32s cubic-bezier(.34,1.56,.64,1)}
.auth-step.active{display:block}
@keyframes stepIn{from{opacity:0;transform:translateX(16px)}to{opacity:1;transform:translateX(0)}}
.auth-step h2{font-size:21px;font-weight:700;margin-bottom:6px;letter-spacing:-0.3px}
.auth-step p{color:var(--text-secondary);font-size:14px;line-height:1.5;margin-bottom:20px}

/* Country & Phone Input */
.phone-input-group{
  display:flex;align-items:center;gap:10px;
  background:var(--bg-input);border:1.5px solid var(--border);
  border-radius:var(--r-md);padding:4px 14px;margin-bottom:12px;
  transition:border-color var(--t),box-shadow var(--t)}
.phone-input-group:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}

.country-picker-btn{
  display:flex;align-items:center;gap:6px;
  padding:10px 10px 10px 2px;
  border-right:1px solid var(--border);
  font-size:15px;font-weight:600;cursor:pointer;white-space:nowrap;
  user-select:none;transition:opacity var(--t)}
.country-picker-btn:hover{opacity:.85}
.country-flag{font-size:20px;line-height:1}
.country-dial{font-size:14px;font-weight:600;color:var(--text-primary)}
.country-arrow{width:14px;height:14px;fill:var(--text-secondary);transition:transform var(--t)}

.phone-input-group input{flex:1;padding:12px 0;font-size:15px;font-weight:500}
.phone-input-group input::placeholder{color:var(--text-muted)}
.auth-country-hint{text-align:center;font-size:12px;color:var(--text-muted);margin-top:10px}

/* Code verification */
.code-inputs{display:flex;gap:10px;justify-content:center;margin-bottom:24px}
.code-digit{width:50px;height:56px;text-align:center;font-size:22px;font-weight:700;
  background:var(--bg-input);border:1.5px solid var(--border);border-radius:var(--r-md);
  color:var(--text-primary);transition:border-color var(--t),background var(--t),box-shadow var(--t)}
.code-digit:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}

/* Name step */
.name-avatar-row{display:flex;align-items:center;gap:16px;margin-bottom:22px}
.name-avatar-placeholder{width:64px;height:64px;border-radius:50%;
  background:linear-gradient(135deg,#6366F1,#06B6D4);
  color:#fff;font-size:20px;font-weight:800;display:flex;align-items:center;justify-content:center;
  flex-shrink:0;cursor:pointer;box-shadow:0 4px 16px var(--accent-glow);
  transition:transform var(--t)}
.name-avatar-placeholder:hover{transform:scale(1.05)}
.name-inputs{flex:1;display:flex;flex-direction:column;gap:10px}
.name-inputs input{width:100%;padding:12px 16px;background:var(--bg-input);
  border:1.5px solid var(--border);border-radius:var(--r-md);font-size:14px;
  transition:border-color var(--t)}
.name-inputs input:focus{border-color:var(--accent)}

.auth-btn{width:100%;padding:14px;
  background:linear-gradient(135deg,var(--accent),var(--accent-cyan));
  color:#fff;font-size:15px;font-weight:700;border-radius:var(--r-md);
  box-shadow:0 4px 18px rgba(99,102,241,.4);letter-spacing:.3px;
  transition:transform var(--t),box-shadow var(--t)}
.auth-btn:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(99,102,241,.5)}
.auth-btn:active{transform:translateY(0)}
.auth-link{display:block;margin-top:14px;color:var(--accent);font-size:13px;
  text-align:center;padding:8px;border-radius:var(--r-sm);transition:background var(--t)}
.auth-link:hover{background:var(--bg-hover)}

/* ═══════════════════════════════════════════════════════════
   COUNTRY SELECTOR MODAL (Worldwide)
═══════════════════════════════════════════════════════════════ */
.country-modal-overlay{
  position:fixed;inset:0;background:rgba(0,0,0,0.65);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  display:flex;align-items:center;justify-content:center;
  z-index:2000;padding:16px;animation:modalFadeIn .2s ease}
@keyframes modalFadeIn{from{opacity:0}to{opacity:1}}

.country-modal{
  width:100%;max-width:440px;max-height:82vh;
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--r-xl);box-shadow:var(--shadow-lg);
  display:flex;flex-direction:column;overflow:hidden;
  animation:modalSlideUp .25s cubic-bezier(0.16,1,0.3,1)}
@keyframes modalSlideUp{
  from{opacity:0;transform:translateY(20px) scale(0.96)}
  to{opacity:1;transform:translateY(0) scale(1)}}

.country-modal-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 20px 12px;border-bottom:1px solid var(--border)}
.country-modal-title{display:flex;align-items:center;gap:8px;font-size:17px;font-weight:700}
.close-modal-btn{
  width:32px;height:32px;border-radius:50%;display:flex;
  align-items:center;justify-content:center;font-size:16px;
  color:var(--text-secondary);transition:background var(--t),color var(--t)}
.close-modal-btn:hover{background:var(--bg-hover);color:var(--text-primary)}

.country-search-bar{
  display:flex;align-items:center;gap:10px;margin:12px 16px;
  padding:8px 14px;background:var(--bg-input);border:1px solid var(--border);
  border-radius:var(--r-md)}
.country-search-bar input{flex:1;font-size:14px}
.country-list{flex:1;overflow-y:auto;padding:6px 8px 14px}

.country-item{
  display:flex;align-items:center;gap:12px;padding:10px 14px;
  border-radius:var(--r-md);cursor:pointer;transition:background var(--t)}
.country-item:hover{background:var(--bg-hover)}
.country-item.selected{background:var(--bg-active);font-weight:600}
.country-item-flag{font-size:22px;line-height:1;flex-shrink:0}
.country-item-name{flex:1;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.country-item-dial{font-size:13px;font-weight:700;color:var(--accent);flex-shrink:0}

/* ═══════════════════════════════════════════════════════════
   APP LAYOUT (Desktop & Mobile)
═══════════════════════════════════════════════════════════════ */
#app{
  display:grid;grid-template-columns:68px 340px 1fr;
  grid-template-rows:100vh;height:100vh;overflow:hidden;
  animation:appFade .4s ease}
@keyframes appFade{from{opacity:0}to{opacity:1}}

/* ── Nav Sidebar ─────────────────────────────────────────── */
.nav-sidebar{
  grid-column:1;background:var(--bg-sidebar);
  border-right:1px solid var(--border);
  display:flex;flex-direction:column;align-items:center;
  padding:14px 0;gap:4px;z-index:10;transition:background var(--t)}

.nav-brand-icon{
  margin-bottom:10px;display:flex;align-items:center;justify-content:center}

.nav-user-avatar{
  width:42px;height:42px;border-radius:50%;
  background:linear-gradient(135deg,#6366F1,#06B6D4);
  color:#fff;font-size:14px;font-weight:800;
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;margin-bottom:10px;flex-shrink:0;
  box-shadow:0 2px 8px var(--accent-glow);
  transition:transform var(--t),box-shadow var(--t)}
.nav-user-avatar:hover{transform:scale(1.08);box-shadow:0 4px 16px var(--accent-glow)}

.nav-icons{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;width:100%}
.nav-icon{width:44px;height:44px;border-radius:var(--r-md);
  display:flex;align-items:center;justify-content:center;
  color:var(--text-secondary);transition:background var(--t),color var(--t),transform var(--t)}
.nav-icon svg{width:22px;height:22px;fill:currentColor}
.nav-icon:hover{background:var(--bg-hover);color:var(--text-primary);transform:scale(1.05)}
.nav-icon.active{color:var(--accent);background:var(--bg-active)}
.theme-toggle{margin-top:auto;margin-bottom:4px}

/* ── List Panel ──────────────────────────────────────────── */
.list-panel{
  grid-column:2;background:var(--bg-panel);
  border-right:1px solid var(--border);
  display:flex;flex-direction:column;overflow:hidden;transition:background var(--t)}

.list-panel-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 18px 12px;flex-shrink:0}
.brand-title-wrap{display:flex;align-items:center;gap:8px}
.panel-title{font-size:20px;font-weight:800;letter-spacing:-0.4px}
.brand-badge{
  font-size:10px;font-weight:800;
  background:linear-gradient(135deg,#6366F1,#06B6D4);
  color:#fff;padding:2px 7px;border-radius:8px;letter-spacing:.5px}

.icon-btn{width:36px;height:36px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  color:var(--text-secondary);transition:background var(--t),color var(--t)}
.icon-btn svg{width:20px;height:20px;fill:currentColor}
.icon-btn:hover{background:var(--bg-hover);color:var(--text-primary)}

.search-bar{
  display:flex;align-items:center;gap:10px;margin:0 14px 10px;
  padding:8px 14px;background:var(--bg-input);border:1px solid var(--border);
  border-radius:var(--r-md);flex-shrink:0}
.search-icon{width:18px;height:18px;fill:var(--text-muted);flex-shrink:0}
.search-bar input{flex:1;font-size:14px}
.search-clear{color:var(--text-muted);font-size:14px;padding:2px 4px}

#chat-list,#users-list{flex:1;overflow-y:auto;padding-bottom:12px}

/* ── Chat Area ───────────────────────────────────────────── */
.chat-area{
  grid-column:3;background:var(--bg-chat);
  display:flex;flex-direction:column;overflow:hidden;position:relative}

.back-btn{display:none;width:36px;height:36px;border-radius:50%;
  align-items:center;justify-content:center;margin-right:8px;
  color:var(--text-secondary);transition:background var(--t),color var(--t)}
.back-btn svg{width:22px;height:22px;fill:currentColor}
.back-btn:hover{background:var(--bg-hover);color:var(--text-primary)}

.chat-header{
  display:flex;align-items:center;gap:12px;
  padding:12px 18px;background:var(--bg-panel);
  border-bottom:1px solid var(--border);flex-shrink:0;z-index:5}
.chat-header-actions{display:flex;gap:6px;align-items:center}
.call-action-btn{
  background:rgba(99,102,241,.12);color:var(--accent)}
.call-action-btn:hover{background:rgba(99,102,241,.24);color:var(--accent)}

.input-bar{
  display:flex;align-items:flex-end;gap:10px;
  padding:12px 18px max(12px, env(safe-area-inset-bottom, 12px));
  background:var(--bg-panel);border-top:1px solid var(--border);flex-shrink:0}
.input-wrapper{
  flex:1;display:flex;align-items:center;gap:8px;
  background:var(--bg-input);border:1px solid var(--border);
  border-radius:var(--r-lg);padding:8px 14px;min-height:44px}
.input-wrapper textarea{
  flex:1;resize:none;max-height:120px;font-size:14px;line-height:1.4}
.emoji-btn{color:var(--text-secondary);transition:color var(--t)}
.emoji-btn svg{width:22px;height:22px;fill:currentColor}
.emoji-btn:hover{color:var(--text-primary)}

.send-btn{
  width:44px;height:44px;border-radius:50%;
  background:linear-gradient(135deg,var(--accent),var(--accent-cyan));
  color:#fff;display:flex;align-items:center;justify-content:center;
  flex-shrink:0;box-shadow:0 2px 8px var(--accent-glow);
  transition:transform var(--t),box-shadow var(--t)}
.send-btn svg{width:20px;height:20px;fill:currentColor}
.send-btn:hover{transform:scale(1.06);box-shadow:0 4px 14px var(--accent-glow)}
.send-btn:active{transform:scale(0.96)}

/* ═══════════════════════════════════════════════════════════
   MESSAGES & ROWS
═══════════════════════════════════════════════════════════ */
#messages-area{
  flex:1;overflow-y:auto;padding:16px 0;
  display:flex;flex-direction:column;gap:3px}

.msg-bubble{
  display:block;max-width:72%;padding:9px 14px 7px;border-radius:18px;
  position:relative;word-break:break-word;line-height:1.5;
  animation:msgSlideIn .22s cubic-bezier(.34,1.56,.64,1);margin:2px 18px}
@keyframes msgSlideIn{
  from{opacity:0;transform:translateY(8px) scale(.96)}
  to{opacity:1;transform:none}}

.msg-bubble.msg-in{
  background:var(--bg-bubble-in);border-bottom-left-radius:4px;
  align-self:flex-start;margin-right:auto;border:1px solid rgba(255,255,255,0.04)}
.msg-bubble.msg-out{
  background:linear-gradient(135deg, #4338CA, #312E81);
  border-bottom-right-radius:4px;align-self:flex-end;margin-left:auto;
  box-shadow:0 2px 8px rgba(49,46,129,.4)}

.msg-sender{font-size:12px;font-weight:700;margin-bottom:3px}
.msg-text{font-size:14.5px;white-space:pre-wrap}
.msg-meta-row{
  display:flex;align-items:center;justify-content:flex-end;
  gap:5px;margin-top:4px}
.msg-time{font-size:11px;color:rgba(255,255,255,.5)}
body.light .msg-time{color:rgba(0,0,0,.4)}
.msg-ticks{font-size:11px;line-height:1;color:rgba(255,255,255,.5)}
.msg-ticks.delivered{color:#38BDF8}

.msg-system{
  text-align:center;margin:8px auto;font-size:12px;color:var(--text-muted);
  background:rgba(255,255,255,.05);padding:5px 16px;border-radius:14px;display:table}
body.light .msg-system{background:rgba(0,0,0,.05)}

/* File cards */
.msg-image{max-width:280px;max-height:220px;border-radius:12px;display:block;
  cursor:pointer;transition:opacity .2s;object-fit:cover}
.msg-image:hover{opacity:.9}
.file-card{
  display:flex;align-items:center;gap:12px;padding:10px 14px;
  background:rgba(99,102,241,.1);border-radius:14px;
  text-decoration:none;color:inherit;border:1px solid rgba(99,102,241,.25);
  transition:background .2s;max-width:280px}
.file-card:hover{background:rgba(99,102,241,.18)}
.file-icon{font-size:28px;flex-shrink:0}
.file-details{flex:1;min-width:0}
.file-name{font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.file-size{font-size:11px;color:var(--text-secondary);margin-top:2px}

/* Chat rows */
.chat-row{
  display:flex;align-items:center;gap:12px;padding:12px 18px;cursor:pointer;
  transition:background .15s;position:relative}
.chat-row:hover{background:var(--bg-hover)}
.chat-row.active{background:var(--bg-active)}
.chat-avatar{
  width:46px;height:46px;border-radius:50%;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  font-size:16px;font-weight:800;color:#fff}
.online-dot{position:relative}
.online-dot::after{
  content:'';position:absolute;bottom:2px;right:2px;
  width:11px;height:11px;border-radius:50%;background:var(--online);
  border:2px solid var(--bg-panel)}
.chat-info{flex:1;min-width:0}
.chat-name{font-size:14.5px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chat-sub{font-size:13px;color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:2px}
.chat-meta{display:flex;flex-direction:column;align-items:flex-end;gap:4px;flex-shrink:0}
.chat-time{font-size:11px;color:var(--text-secondary)}
.unread-badge{
  min-width:20px;height:20px;padding:0 6px;border-radius:10px;
  background:var(--accent);color:#fff;font-size:11px;font-weight:800;
  display:flex;align-items:center;justify-content:center}
.empty-list{padding:28px 16px;color:var(--text-muted);font-size:13px;text-align:center}

/* Typing indicator */
.typing-indicator{display:flex;align-items:center;gap:8px;padding:6px 18px}
.typing-dots{
  display:flex;gap:4px;align-items:center;background:var(--bg-bubble-in);
  padding:8px 14px;border-radius:14px;border-bottom-left-radius:4px}
.typing-dots span{
  width:7px;height:7px;border-radius:50%;background:var(--text-secondary);
  animation:typingDot 1.4s ease-in-out infinite}
.typing-dots span:nth-child(2){animation-delay:.2s}
.typing-dots span:nth-child(3){animation-delay:.4s}
@keyframes typingDot{
  0%,80%,100%{transform:scale(.8);opacity:.5}
  40%{transform:scale(1.15);opacity:1}}
.typing-label{font-size:12px;color:var(--text-secondary)}

/* ═══════════════════════════════════════════════════════════
   HD CALL OVERLAY & WEBRTC CONTROLS
═══════════════════════════════════════════════════════════════ */
.call-overlay{
  position:fixed;inset:0;background:#030712;z-index:1500;
  display:flex;flex-direction:column;align-items:center;
  justify-content:space-between;overflow:hidden}
.call-overlay video#remote-video{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:1}

.call-quality-badge{
  position:absolute;top:18px;left:50%;transform:translateX(-50%);
  display:flex;align-items:center;gap:8px;
  background:rgba(15,23,42,0.85);backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,0.12);
  padding:6px 14px;border-radius:20px;font-size:12px;font-weight:600;
  color:#E2E8F0;z-index:15;box-shadow:0 4px 16px rgba(0,0,0,0.4)}
.hd-dot{
  width:8px;height:8px;border-radius:50%;background:#10B981;
  box-shadow:0 0 8px #10B981;animation:pulseDot 2s infinite}
@keyframes pulseDot{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.6;transform:scale(.85)}}

.call-audio-bg{
  position:absolute;inset:0;display:flex;flex-direction:column;
  align-items:center;justify-content:center;
  background:radial-gradient(ellipse at center,#1E1B4B 0%,#090E17 80%);z-index:2}
.call-big-avatar{
  width:120px;height:120px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-size:44px;font-weight:800;color:#fff;
  box-shadow:0 0 60px rgba(99,102,241,0.5);margin-bottom:32px}
.audio-waves{display:flex;gap:6px;align-items:center;height:40px}
.wave{width:4px;height:10px;background:var(--accent);border-radius:2px;
  animation:wavePulse 1.2s ease-in-out infinite}
.wave:nth-child(1){animation-delay:0s}
.wave:nth-child(2){animation-delay:.15s}
.wave:nth-child(3){animation-delay:.3s}
.wave:nth-child(4){animation-delay:.45s}
.wave:nth-child(5){animation-delay:.6s}
@keyframes wavePulse{0%,100%{height:8px}50%{height:36px}}

.local-pip{
  position:absolute;top:20px;right:20px;width:150px;height:105px;
  border-radius:var(--r-md);overflow:hidden;background:#000;
  border:2px solid rgba(255,255,255,0.2);box-shadow:0 8px 28px rgba(0,0,0,0.6);
  z-index:10;transition:all var(--t)}
.local-pip video{width:100%;height:100%;object-fit:cover}
.pip-no-video{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  background:#111;color:var(--text-muted);font-size:12px}

.call-top-info{position:relative;z-index:10;text-align:center;padding-top:60px}
.call-peer-name{font-size:24px;font-weight:800;margin-bottom:6px;text-shadow:0 2px 8px rgba(0,0,0,.6)}
.call-status-txt{font-size:14px;color:var(--text-secondary);text-shadow:0 1px 4px rgba(0,0,0,.6)}
.call-timer{font-size:16px;font-weight:700;color:#22D3EE;margin-top:6px}

.call-controls{
  position:relative;z-index:10;display:flex;align-items:center;
  justify-content:center;gap:16px;padding:24px 20px max(24px, env(safe-area-inset-bottom, 24px));
  background:linear-gradient(to top, rgba(0,0,0,.8) 0%, transparent 100%);width:100%}
.call-ctrl-group{display:flex;gap:12px}
.call-ctrl{
  display:flex;flex-direction:column;align-items:center;gap:6px;
  width:58px;height:58px;border-radius:50%;background:rgba(255,255,255,0.12);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  color:#fff;font-size:11px;font-weight:600;padding:12px;
  transition:all var(--t)}
.call-ctrl svg{width:22px;height:22px;fill:currentColor}
.call-ctrl span{font-size:10px}
.call-ctrl:hover{background:rgba(255,255,255,0.22);transform:scale(1.06)}
.call-ctrl.active{background:rgba(239,68,68,0.6)!important}
.end-call-btn{
  width:64px;height:64px;background:#EF4444!important;
  box-shadow:0 6px 20px rgba(239,68,68,0.5)}
.end-call-btn:hover{background:#DC2626!important;transform:scale(1.08)}

/* Incoming call overlay */
.incoming-overlay{
  position:fixed;inset:0;background:rgba(0,0,0,0.75);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  display:flex;align-items:center;justify-content:center;z-index:2000;padding:16px}
.incoming-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--r-xl);padding:36px;width:100%;max-width:340px;
  display:flex;flex-direction:column;align-items:center;text-align:center;
  box-shadow:var(--shadow-lg);animation:cardIn .4s cubic-bezier(.34,1.56,.64,1)}
.ring-container{margin-bottom:20px}
.ring-outer{
  width:96px;height:96px;border-radius:50%;background:rgba(99,102,241,0.2);
  display:flex;align-items:center;justify-content:center;
  animation:ringWave 1.8s infinite}
.ring-inner{
  width:82px;height:82px;border-radius:50%;background:rgba(99,102,241,0.3);
  display:flex;align-items:center;justify-content:center}
.incoming-avatar{
  width:68px;height:68px;border-radius:50%;background:var(--accent);
  color:#fff;font-size:24px;font-weight:800;display:flex;align-items:center;justify-content:center}
@keyframes ringWave{0%{transform:scale(0.95);box-shadow:0 0 0 0 rgba(99,102,241,.6)}
  70%{transform:scale(1.05);box-shadow:0 0 0 20px rgba(99,102,241,0)}
  100%{transform:scale(0.95);box-shadow:0 0 0 0 rgba(99,102,241,0)}}
.incoming-name{font-size:20px;font-weight:800;margin-bottom:4px}
.incoming-type{font-size:13px;color:var(--accent);margin-bottom:28px}
.incoming-actions{display:flex;gap:16px;width:100%}
.accept-btn,.reject-btn{
  flex:1;padding:12px;border-radius:var(--r-md);font-size:14px;
  font-weight:700;display:flex;align-items:center;justify-content:center;
  gap:8px;color:#fff;transition:transform var(--t),box-shadow var(--t)}
.accept-btn svg,.reject-btn svg{width:18px;height:18px;fill:currentColor}
.accept-btn{background:#10B981;box-shadow:0 4px 16px rgba(16,185,129,.4)}
.accept-btn:hover{transform:scale(1.04);box-shadow:0 6px 20px rgba(16,185,129,.5)}
.reject-btn{background:#EF4444;box-shadow:0 4px 16px rgba(239,68,68,.4)}
.reject-btn:hover{transform:scale(1.04);box-shadow:0 6px 20px rgba(239,68,68,.5)}

/* Settings & Toast */
.settings-panel{
  position:fixed;top:0;left:68px;width:340px;height:100vh;
  background:var(--bg-card);border-right:1px solid var(--border);
  display:flex;flex-direction:column;z-index:20;box-shadow:var(--shadow-md);
  animation:slideRight .25s ease}
@keyframes slideRight{from{transform:translateX(-100%)}to{transform:translateX(0)}}
.settings-header{display:flex;align-items:center;gap:12px;padding:18px;border-bottom:1px solid var(--border)}
.settings-profile{display:flex;align-items:center;gap:14px;padding:20px 18px;border-bottom:1px solid var(--border)}
.settings-avatar{width:56px;height:56px;border-radius:50%;background:var(--accent);
  display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:800;color:#fff}
.settings-name{font-size:16px;font-weight:700}
.settings-username{font-size:13px;color:var(--online);margin-top:2px}
.settings-bio{font-size:12px;color:var(--text-muted);margin-top:4px}
.settings-sections{flex:1;overflow-y:auto;padding:12px 0}
.settings-section-title{padding:12px 18px 6px;font-size:11px;font-weight:700;
  color:var(--text-muted);text-transform:uppercase;letter-spacing:.7px}
.settings-item{display:flex;align-items:center;gap:14px;padding:12px 18px;cursor:pointer;transition:background var(--t)}
.settings-item:hover{background:var(--bg-hover)}
.settings-item-icon{font-size:18px}
.settings-item-content{flex:1}
.settings-item-label{font-size:14px;font-weight:500}
.settings-item-value{font-size:12px;color:var(--text-secondary);margin-top:2px}
.toggle-switch{width:42px;height:24px;border-radius:12px;background:rgba(255,255,255,.16);
  position:relative;transition:background var(--t)}
.toggle-switch::after{content:'';position:absolute;width:18px;height:18px;border-radius:50%;
  background:#fff;top:3px;left:3px;transition:transform var(--t)}
.toggle-switch.active{background:var(--accent)}
.toggle-switch.active::after{transform:translateX(18px)}

.toast{
  position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(80px);
  background:rgba(15,23,42,0.92);backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);border:1px solid var(--border);
  color:#fff;padding:10px 20px;border-radius:24px;font-size:13px;font-weight:600;
  box-shadow:var(--shadow-md);z-index:3000;transition:transform .28s cubic-bezier(.34,1.56,.64,1);
  pointer-events:none}
.toast.visible{transform:translateX(-50%) translateY(0)}

.conn-bar{
  position:fixed;top:0;left:0;right:0;background:#F59E0B;color:#000;
  font-size:12px;font-weight:700;text-align:center;padding:6px;z-index:4000}

.chat-empty{flex:1;display:flex;flex-direction:column;align-items:center;
  justify-content:center;gap:16px;padding:40px;text-align:center;color:var(--text-secondary)}
.chat-empty h2{font-size:20px;font-weight:800;color:var(--text-primary)}
.chat-empty p{font-size:14px;line-height:1.6;max-width:320px}
.chat-active{display:flex;flex-direction:column;flex:1;overflow:hidden}

.list-section-label{padding:10px 18px 4px;font-size:11px;font-weight:700;
  color:var(--text-muted);text-transform:uppercase;letter-spacing:.7px}

.emoji-picker{
  position:absolute;bottom:64px;left:18px;width:340px;max-height:360px;
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--r-lg);box-shadow:var(--shadow-lg);
  display:flex;flex-direction:column;z-index:30;overflow:hidden}
.emoji-categories{display:flex;gap:4px;padding:8px 10px;border-bottom:1px solid var(--border);overflow-x:auto}
.emoji-cat-btn{padding:6px 8px;font-size:16px;border-radius:var(--r-sm)}
.emoji-cat-btn.active{background:var(--bg-active)}
.emoji-grid{flex:1;overflow-y:auto;display:grid;grid-template-columns:repeat(7,1fr);gap:4px;padding:10px}
.emoji-item{font-size:20px;padding:6px;border-radius:var(--r-sm);display:flex;align-items:center;justify-content:center}
.emoji-item:hover{background:var(--bg-hover)}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE (Mobile First Class Experience)
═══════════════════════════════════════════════════════════ */
@media(max-width:900px){
  #app{grid-template-columns:60px 1fr}
  .list-panel{grid-column:2}
  .chat-area{
    grid-column:2;position:fixed;inset:0;
    transform:translateX(100%);transition:transform .28s cubic-bezier(0.32, 0.72, 0, 1);
    z-index:25;background:var(--bg-chat)}
  .chat-area.open{transform:translateX(0)}
  .back-btn{display:flex!important}
}

@media(max-width:600px){
  #app{grid-template-columns:1fr}
  .nav-sidebar{
    position:fixed;bottom:0;left:0;right:0;top:auto;
    flex-direction:row;height:56px;padding:0 12px;
    border-right:none;border-top:1px solid var(--border);z-index:30;
    justify-content:space-around;background:var(--bg-sidebar)}
  .nav-brand-icon{display:none}
  .nav-user-avatar{margin-bottom:0;width:36px;height:36px;font-size:12px}
  .nav-icons{flex-direction:row;flex:0;gap:8px}
  .theme-toggle{margin-top:0;margin-bottom:0}

  .list-panel{grid-column:1;padding-bottom:60px;height:100vh}
  .chat-area{grid-column:1;z-index:40}
  .chat-area.open ~ .nav-sidebar,
  body.in-chat .nav-sidebar{display:none}

  .settings-panel{left:0;width:100%;z-index:50}
  .emoji-picker{left:0;width:100%;border-radius:var(--r-lg) var(--r-lg) 0 0;bottom:60px}

  .country-modal{
    max-height:88vh;border-radius:var(--r-xl) var(--r-xl) 0 0;
    position:fixed;bottom:0;left:0;right:0;max-width:100%;
    animation:modalSlideUpMobile .26s cubic-bezier(0.16,1,0.3,1)}
  @keyframes modalSlideUpMobile{
    from{transform:translateY(100%)}
    to{transform:translateY(0)}}

  .local-pip{width:110px;height:82px;top:60px;right:12px}
  .call-controls{padding:16px 12px max(16px, env(safe-area-inset-bottom, 16px))}
  .call-ctrl{width:50px;height:50px;padding:8px}
  .call-ctrl svg{width:20px;height:20px}
  .end-call-btn{width:56px;height:56px}
  .phone-input-group{padding:2px 10px}
  .country-picker-btn{padding:8px 6px 8px 0}
  .msg-bubble{max-width:85%;margin:2px 12px}
}