/* ============================================================
   NEXUS CHAT v4 — PREMIUM OLED UI (Blue/Violet Accent)
   Font: Inter + JetBrains Mono
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Premium OLED Dark Theme */
  --bg:         #030303;      /* Deepest black for OLED */
  --bg1:        #0a0a0c;
  --bg2:        #121215;
  --bg3:        #1a1a1f;
  --bg4:        #26262d;
  
  /* Vibrant Blue/Violet Accents */
  --accent:     #3b82f6;
  --accent-g:   linear-gradient(135deg, #4f46e5 0%, #3b82f6 100%);
  --accent-hov: linear-gradient(135deg, #6366f1 0%, #60a5fa 100%);
  
  --adim:       rgba(59, 130, 246, 0.12);
  --aglow:      rgba(59, 130, 246, 0.25);
  
  /* Status Colors */
  --green:      #10b981;
  --red:        #f43f5e;
  --yel:        #f59e0b;
  
  /* Text Colors */
  --t1:         #ffffff;
  --t2:         #a1a1aa;
  --t3:         #52525b;
  
  /* Borders & Shadows */
  --bdr:        rgba(255, 255, 255, 0.06);
  --bdr2:       rgba(255, 255, 255, 0.12);
  --shadow-lg:  0 20px 40px rgba(0, 0, 0, 0.6);
  --shadow-sm:  0 4px 12px rgba(0, 0, 0, 0.3);
  
  /* Radii */
  --r:          14px;
  --r2:         24px;
  --pill:       100px;
  
  /* Typography */
  --font:       'Inter', system-ui, -apple-system, sans-serif;
  --mono:       'JetBrains Mono', monospace;
  
  /* Safeties */
  --safe-b:     env(safe-area-inset-bottom, 0px);
  --safe-t:     env(safe-area-inset-top, 0px);
}

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--t1);
  font-family: var(--font);
  font-size: 14.5px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: fixed;
  width: 100%;
}

::selection {
  background: var(--accent);
  color: #fff;
}

/* ── Custom Scrollbar ── */
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bdr2); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--t3); }
* { scrollbar-width: thin; scrollbar-color: var(--bdr2) transparent; }

/* ── Screens & Transitions ── */
.screen {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  padding-top: calc(24px + var(--safe-t));
  padding-bottom: calc(24px + var(--safe-b));
  opacity: 0; transform: scale(0.97) translateY(10px);
  pointer-events: none;
  transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1), transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 10;
  overflow-y: auto;
}
.screen.active {
  opacity: 1; transform: none;
  pointer-events: all;
}
#s-chat {
  padding: 24px; flex-direction: row; align-items: stretch; gap: 24px; overflow: hidden; height: 100dvh;
  background: radial-gradient(circle at top left, rgba(59,130,246,0.05), transparent 40%), radial-gradient(circle at bottom right, rgba(79,70,229,0.05), transparent 40%), var(--bg);
}

/* ── Auth/Lobby Cards (Glassmorphism) ── */
.auth-wrap {
  width: 100%; max-width: 400px;
  background: rgba(14, 14, 18, 0.65);
  border: 1px solid var(--bdr);
  border-top-color: rgba(255, 255, 255, 0.12);
  border-radius: var(--r2);
  padding: 40px 36px;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0,0,0,0.5);
  backdrop-filter: blur(28px); -webkit-backdrop-filter: blur(28px);
  margin: auto;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
.auth-wrap:hover { transform: translateY(-4px); }
.auth-wrap.wide { max-width: 440px; }

/* Logo */
.auth-logo { display: flex; align-items: center; gap: 12px; margin-bottom: 32px; transition: transform .2s ease; }
.auth-logo:hover { transform: scale(1.03); }
.auth-logo.sm { margin-bottom: 0; }
.auth-logo svg { filter: drop-shadow(0 2px 8px var(--aglow)); }
.logo-name { font-family: var(--font); font-size: 20px; font-weight: 800; letter-spacing: -0.03em; color: var(--t1); background: var(--accent-g); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

/* Typography inside Auth */
.auth-title { font-size: 24px; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 8px; }
.auth-sub { font-size: 14px; color: var(--t2); margin-bottom: 28px; line-height: 1.5; }

/* Identity Screen */
.identity-box {
  background: var(--bg2); border: 1px solid var(--bdr); border-radius: var(--r);
  padding: 24px; margin-bottom: 24px; text-align: center;
  box-shadow: inset 0 2px 10px rgba(0,0,0,0.2);
}
.id-label { font-size: 11px; font-weight: 700; letter-spacing: 0.15em; color: var(--t3); margin-bottom: 12px; }
.id-value { font-family: var(--mono); font-size: 22px; font-weight: 600; color: var(--accent); letter-spacing: -0.02em; min-height: 32px; text-shadow: 0 0 16px var(--aglow); }
.shimmer-text { opacity: .4; animation: shim 1.2s infinite alternate ease-in-out; }
@keyframes shim { from {opacity:.2; filter:blur(1px)} to {opacity:.8; filter:blur(0)} }
.privacy-note { font-size: 12px; color: var(--t3); text-align: center; margin-top: 20px; line-height: 1.6; display: flex; align-items: center; justify-content: center; gap: 6px; }

/* Lobby Header */
.lobby-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 28px; }
.user-badge {
  display: flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.03); border: 1px solid var(--bdr); border-radius: var(--pill);
  padding: 6px 14px; font-family: var(--mono); font-size: 12px; font-weight: 500; color: var(--t2);
  max-width: 180px; overflow: hidden; backdrop-filter: blur(8px);
}
.user-badge span:last-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.u-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 8px var(--green); flex-shrink: 0; }

/* Tabs */
.tab-bar { display: flex; gap: 4px; background: rgba(0,0,0,0.4); border: 1px solid var(--bdr); border-radius: var(--pill); padding: 4px; margin-bottom: 24px; }
.tab-btn {
  flex: 1; background: transparent; border: none; color: var(--t2);
  font-family: var(--font); font-size: 13.5px; font-weight: 600; padding: 10px;
  border-radius: var(--pill); cursor: pointer; transition: all 0.3s ease; -webkit-tap-highlight-color: transparent;
}
.tab-btn:hover { color: var(--t1); }
.tab-btn.active { background: var(--bg3); color: var(--t1); box-shadow: var(--shadow-sm); }
.tab-pane { display: none; animation: fadeSlide .3s cubic-bezier(.16,1,.3,1); }
.tab-pane.active { display: block; }
@keyframes fadeSlide { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* Forms */
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 11px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--t2); margin-bottom: 8px; }
.field-hint { font-size: 12px; color: var(--t3); margin-top: 6px; }
input[type=text], input[type=password], textarea {
  width: 100%; background: var(--bg2); border: 1px solid var(--bdr); border-radius: var(--r);
  color: var(--t1); font-family: var(--font); font-size: 15px; padding: 14px 16px; outline: none;
  transition: all 0.25s cubic-bezier(.16,1,.3,1); box-shadow: inset 0 2px 6px rgba(0,0,0,0.2);
}
input:focus, textarea:focus { background: var(--bg1); border-color: var(--accent); box-shadow: 0 0 0 4px var(--adim), inset 0 2px 6px rgba(0,0,0,0.2); }
input::placeholder, textarea::placeholder { color: var(--t3); }
.pw-row { position: relative; }
.pw-row input { padding-right: 48px; }
.pw-eye { position: absolute; right: 14px; top: 50%; transform: translateY(-50%); background: none; border: none; color: var(--t3); cursor: pointer; padding: 4px; transition: color .2s; }
.pw-eye:hover { color: var(--t1); }
.expire-row { display: flex; align-items: center; gap: 10px; font-size: 12px; font-weight: 500; color: var(--t3); background: rgba(255,255,255,0.02); border: 1px dashed var(--bdr); border-radius: var(--r); padding: 12px 16px; margin-bottom: 20px; }
.err-msg { font-size: 13px; font-weight: 500; color: var(--red); margin-top: 12px; min-height: 20px; text-align: center; animation: shake .4s ease; }
.field-hint.found { color: var(--green); font-weight: 500; } .field-hint.missing { color: var(--red); } .field-hint.checking { color: var(--accent); animation: pulse 1s infinite alternate; }
@keyframes pulse { from { opacity: 0.5 } to { opacity: 1 } }

/* Buttons */
.btn-main {
  width: 100%; background: var(--accent-g); color: #fff; border: none; border-radius: var(--r);
  font-family: var(--font); font-size: 15px; font-weight: 600; letter-spacing: 0.02em; padding: 14px;
  cursor: pointer; transition: all 0.25s cubic-bezier(.16,1,.3,1); box-shadow: 0 8px 20px var(--aglow);
  text-shadow: 0 1px 2px rgba(0,0,0,0.2); -webkit-tap-highlight-color: transparent;
}
.btn-main:hover { background: var(--accent-hov); transform: translateY(-2px); box-shadow: 0 12px 24px rgba(59,130,246,0.35); }
.btn-main:active { transform: scale(0.96); box-shadow: 0 4px 10px var(--aglow); }
.btn-main:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; filter: grayscale(50%); }
.btn-main.sm { width: auto; padding: 10px 24px; font-size: 14px; }
.btn-ghost {
  background: rgba(255,255,255,0.04); border: 1px solid var(--bdr2); color: var(--t2); border-radius: var(--r);
  font-family: var(--font); font-size: 14px; font-weight: 500; padding: 10px 24px; cursor: pointer;
  transition: all 0.2s; -webkit-tap-highlight-color: transparent;
}
.btn-ghost:hover { background: rgba(255,255,255,0.08); color: var(--t1); border-color: rgba(255,255,255,0.2); }
.btn-danger {
  background: rgba(244,63,94,0.1); border: 1px solid rgba(244,63,94,0.3); color: var(--red); border-radius: var(--r);
  font-family: var(--font); font-size: 14px; font-weight: 600; padding: 10px 24px; cursor: pointer; transition: all .2s;
}
.btn-danger:hover { background: rgba(244,63,94,0.2); border-color: var(--red); box-shadow: 0 4px 16px rgba(244,63,94,0.2); transform: translateY(-1px); }

/* ── Sidebar ── */
.sidebar {
  width: 320px; flex-shrink: 0;
  background: rgba(14,14,18,0.7); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--bdr); border-radius: 32px;
  display: flex; flex-direction: column; height: 100%;
  transition: transform 0.3s cubic-bezier(0.16,1,.3,1); z-index: 10; overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.sb-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.8); z-index: 49; backdrop-filter: blur(4px); }
.sb-overlay.active { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0 } to { opacity: 1 } }
.sb-head { display: flex; align-items: center; justify-content: space-between; padding: 24px; border-bottom: 1px solid var(--bdr); flex-shrink: 0; }
.sb-close { display: none; background: rgba(255,255,255,0.05); border: 1px solid var(--bdr); color: var(--t2); cursor: pointer; padding: 8px; border-radius: var(--r); transition: all .2s; }
.sb-close:hover { color: var(--t1); background: rgba(255,255,255,0.1); }
.sb-room-block { padding: 24px; border-bottom: 1px solid var(--bdr); flex-shrink: 0; background: linear-gradient(180deg, rgba(255,255,255,0.02) 0%, transparent 100%); }
.sb-section-label { font-size: 11px; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: var(--t3); margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
.sb-room-name { display: flex; align-items: center; gap: 10px; font-family: var(--mono); font-size: 15px; font-weight: 600; color: var(--t1); word-break: break-all; }
.sb-expire { margin-top: 14px; font-size: 12px; font-weight: 500; color: var(--yel); background: rgba(245,158,11,0.1); border: 1px solid rgba(245,158,11,0.25); border-radius: 8px; padding: 10px 14px; line-height: 1.5; display: flex; gap: 8px; }
.sb-online-block { flex: 1; overflow-y: auto; padding: 20px 24px; min-height: 0; }
.online-cnt { background: var(--bg3); color: var(--t2); font-size: 11px; padding: 2px 10px; border-radius: var(--pill); font-family: var(--mono); margin-left: 6px; border: 1px solid var(--bdr); }
.online-list { list-style: none; display: flex; flex-direction: column; gap: 6px; }
.online-item { display: flex; align-items: center; gap: 12px; font-family: var(--font); font-size: 14px; font-weight: 500; color: var(--t2); padding: 10px 12px; border-radius: 10px; transition: all .2s; cursor: default; }
.online-item:hover { background: rgba(255,255,255,0.03); color: var(--t1); transform: translateX(2px); }
.online-item.me { color: var(--t1); background: var(--adim); font-weight: 600; border: 1px solid rgba(59,130,246,0.2); }
.online-item.me .u-dot { background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.sb-foot { padding: 20px 24px; padding-bottom: calc(20px + var(--safe-b)); border-top: 1px solid var(--bdr); background: rgba(0,0,0,0.2); display: flex; align-items: center; justify-content: space-between; flex-shrink: 0; }
.sb-self { display: flex; align-items: center; gap: 10px; overflow: hidden; min-width: 0; }
.mono { font-family: var(--mono); font-size: 13px; font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--t1); }
.sb-actions { display: flex; gap: 8px; align-items: center; }
.sb-action-btn { background: var(--bg3); border: 1px solid var(--bdr); color: var(--t2); width: 36px; height: 36px; border-radius: 10px; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all .2s; flex-shrink: 0; }
.sb-action-btn:hover { color: var(--t1); background: var(--bg4); border-color: var(--bdr2); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.sb-action-btn.danger:hover { color: var(--red); border-color: rgba(244,63,94,.4); background: rgba(244,63,94,.1); }
.hidden { display: none !important; }

/* ── Chat Main ── */
.chat-main {
  flex: 1; display: flex; flex-direction: column; min-width: 0; height: 100%; overflow: hidden; position: relative; z-index: 1;
  background: rgba(10,10,12,0.6); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  border-radius: 32px; border: 1px solid var(--bdr); box-shadow: var(--shadow-lg);
}
.chat-main::before {
  content: ''; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 24px 24px; pointer-events: none; z-index: 0;
  mask-image: linear-gradient(to bottom, black 0%, transparent 100%); -webkit-mask-image: linear-gradient(to bottom, black 0%, transparent 100%);
}
.chat-head {
  position: absolute; top: 24px; left: 50%; transform: translateX(-50%);
  display: flex; align-items: center; gap: 16px; padding: 12px 24px;
  border-radius: 100px; border: 1px solid var(--bdr);
  background: rgba(20,20,24,0.85); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  z-index: 50; box-shadow: 0 10px 40px rgba(0,0,0,0.5);
  transition: transform .4s cubic-bezier(.34,1.56,.64,1), box-shadow .4s ease;
  cursor: default;
}
.chat-head:hover { transform: translateX(-50%) translateY(-3px) scale(1.02); box-shadow: 0 16px 48px rgba(0,0,0,0.7); }
.menu-btn { display: none; background: rgba(255,255,255,0.05); border: 1px solid var(--bdr); color: var(--t1); cursor: pointer; padding: 10px; border-radius: 50%; transition: all .2s; }
.menu-btn:hover { background: rgba(255,255,255,0.1); transform: scale(1.05); }
.head-center { display: flex; align-items: center; gap: 10px; color: var(--t2); justify-content: center; }
.room-title { font-family: var(--mono); font-size: 16px; font-weight: 600; letter-spacing: -0.01em; color: var(--t1); }
.head-right { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.icon-btn { background: rgba(255,255,255,0.03); border: 1px solid var(--bdr); color: var(--t2); width: 38px; height: 38px; border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all .2s; }
.icon-btn:hover { color: var(--accent); border-color: rgba(59,130,246,0.3); background: rgba(59,130,246,0.05); transform: scale(1.05); box-shadow: 0 4px 12px rgba(59,130,246,0.2); }
.conn-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--t3); flex-shrink: 0; transition: background .3s, box-shadow .3s; }
.conn-dot.connected { background: var(--green); box-shadow: 0 0 8px var(--green); }
.conn-dot.connecting { background: var(--yel); animation: blink 1s infinite alternate; }
.conn-dot.disconnected { background: var(--red); box-shadow: 0 0 8px var(--red); }

/* ── Messages ── */
.msgs-wrap { flex: 1; overflow-y: auto; overflow-x: hidden; min-height: 0; -webkit-overflow-scrolling: touch; scroll-behavior: smooth; position: relative; z-index: 1; padding-bottom: 120px; padding-top: 100px; contain: content; }
.msgs-list { padding: 24px; padding-bottom: 0; display: flex; flex-direction: column; gap: 4px; min-height: 100%; justify-content: flex-end; }
.day-line { display: flex; align-items: center; gap: 14px; color: var(--t3); font-size: 12px; font-weight: 500; margin: 24px 0 16px; }
.day-line::before, .day-line::after { content: ''; flex: 1; height: 1px; background: linear-gradient(90deg, transparent, var(--bdr2), transparent); }

/* Message rows */
.msg-row { display: flex; flex-direction: column; animation: msgSlideUp 0.5s cubic-bezier(0.34, 1.56, 0.64, 1); transform-origin: bottom; margin-bottom: 6px; }
.msg-row.self { align-items: flex-end; }
.msg-row.other { align-items: flex-start; }
.msg-row.system { align-items: center; margin: 12px 0; }
@keyframes msgSlideUp { from { opacity: 0; transform: translateY(20px) scale(0.9); } to { opacity: 1; transform: none scale(1); } }
.msg-meta { display: flex; align-items: baseline; gap: 8px; margin-bottom: 4px; padding: 0 4px; }
.msg-user { font-size: 12px; font-weight: 700; color: var(--accent); font-family: var(--mono); letter-spacing: -0.02em; }
.msg-row.self .msg-user { color: #818cf8; }
.msg-time { font-size: 10px; font-weight: 500; color: var(--t3); font-family: var(--mono); }

/* Bubbles */
.bubble {
  max-width: min(480px, 80%); padding: 12px 18px; border-radius: 20px; font-size: 15px; line-height: 1.5;
  word-break: break-word; box-shadow: var(--shadow-sm); transition: transform .2s ease;
}
.msg-row:hover .bubble { transform: translateY(-1px); }
.msg-row.other .bubble { background: var(--bg3); border: 1px solid var(--bdr); border-bottom-left-radius: 4px; color: var(--t1); }
.msg-row.self .bubble { background: var(--accent-g); border: none; border-bottom-right-radius: 4px; color: #fff; text-shadow: 0 1px 2px rgba(0,0,0,0.15); box-shadow: 0 4px 16px rgba(59,130,246,0.25); }

/* Image bubble */
.img-bubble { max-width: min(320px, 75%); border-radius: 16px; overflow: hidden; cursor: zoom-in; border: 1px solid var(--bdr); box-shadow: var(--shadow-sm); background: var(--bg2); }
.img-bubble img { width: 100%; display: block; max-height: 360px; object-fit: cover; transition: transform .4s ease, opacity .4s ease; }
.img-bubble:hover img { transform: scale(1.02); opacity: 0.9; }

/* File bubble */
.file-bubble {
  display: flex; align-items: center; gap: 14px; background: rgba(255,255,255,0.03); border: 1px solid var(--bdr);
  border-radius: 14px; padding: 12px 16px; max-width: min(320px, 75%); text-decoration: none; transition: all .2s; backdrop-filter: blur(8px);
}
.file-bubble:hover { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.15); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.file-icon { color: var(--accent); flex-shrink: 0; background: var(--adim); padding: 8px; border-radius: 10px; }
.file-info { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.file-name { font-size: 14px; font-weight: 600; color: var(--t1); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-size { font-size: 12px; font-weight: 500; color: var(--t3); }

/* Secret bubble */
.secret-bubble {
  background: repeating-linear-gradient(45deg, rgba(20,20,24,0.9), rgba(20,20,24,0.9) 10px, rgba(40,40,45,0.9) 10px, rgba(40,40,45,0.9) 20px) !important;
  border: 1px dashed var(--red) !important; color: var(--red) !important; cursor: pointer;
  display: flex; align-items: center; gap: 8px; padding: 10px 16px; font-weight: 600;
  transition: all .2s; backdrop-filter: blur(8px);
}
.secret-bubble:hover { filter: brightness(1.2); }
.secret-bubble.revealed {
  background: var(--bg3) !important; border: 1px solid var(--red) !important; color: var(--t1) !important;
  cursor: default; padding-right: 32px; position: relative;
}
.msg-row.self .secret-bubble.revealed { background: var(--accent-g) !important; color: #fff !important; border: none !important; }
.secret-timer {
  position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
  font-family: var(--mono); font-size: 11px; font-weight: 800; color: var(--red);
}
.msg-row.self .secret-timer { color: #fcd34d; }
.explode-anim {
  animation: explode 0.5s forwards cubic-bezier(0.36, 0, 0.66, -0.56);
}
@keyframes explode {
  0% { transform: scale(1) rotate(0deg); opacity: 1; filter: blur(0); }
  20% { transform: scale(1.1) rotate(-3deg); filter: blur(2px) brightness(2); }
  40% { transform: scale(1.1) rotate(3deg); filter: blur(4px) brightness(2); }
  100% { transform: scale(0) rotate(0deg); opacity: 0; filter: blur(10px); margin-bottom: -40px; }
}

/* Audio bubble */
.audio-bubble {
  display: flex; align-items: center; gap: 12px; padding: 8px 14px 8px 8px; border-radius: 20px;
  background: var(--bg3); border: 1px solid var(--bdr); max-width: min(300px, 80%); box-shadow: var(--shadow-sm);
}
.msg-row.self .audio-bubble { background: var(--accent-g); border: none; color: #fff; }
.audio-btn { width: 36px; height: 36px; border-radius: 50%; background: var(--accent); color: #fff; border: none; display: flex; align-items: center; justify-content: center; cursor: pointer; flex-shrink: 0; transition: all .2s; box-shadow: 0 2px 8px rgba(0,0,0,0.2); }
.msg-row.self .audio-btn { background: rgba(255,255,255,0.2); color: #fff; }
.audio-btn:hover { transform: scale(1.05); }
.audio-btn.playing { background: var(--yel); }
.audio-wave { flex: 1; height: 24px; position: relative; display: flex; align-items: center; min-width: 120px; }
.audio-wave canvas { width: 100%; height: 100%; border-radius: 12px; }
.audio-time { font-family: var(--mono); font-size: 11px; font-weight: 600; color: var(--t2); flex-shrink: 0; }
.msg-row.self .audio-time { color: rgba(255,255,255,0.8); }

/* Location bubble */
.loc-bubble {
  display: flex; align-items: center; gap: 14px; background: rgba(59,130,246,0.05); border: 1px solid rgba(59,130,246,0.2);
  border-radius: 14px; padding: 12px 16px; max-width: min(300px, 75%); text-decoration: none; transition: all .2s;
}
.loc-bubble:hover { background: rgba(59,130,246,0.1); border-color: rgba(59,130,246,0.4); transform: translateY(-2px); box-shadow: 0 4px 16px rgba(59,130,246,0.15); }
.loc-icon { font-size: 24px; flex-shrink: 0; filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3)); }
.loc-info .loc-label { font-size: 14px; font-weight: 600; color: var(--accent); display: block; margin-bottom: 2px; }
.loc-info .loc-coords { font-size: 11px; font-weight: 500; color: var(--t2); font-family: var(--mono); }

/* System pill */
.sys-pill { font-size: 11.5px; font-weight: 500; color: var(--t2); background: rgba(255,255,255,0.03); border: 1px solid var(--bdr); border-radius: var(--pill); padding: 4px 16px; backdrop-filter: blur(4px); }

/* ── Typing ── */
.typing-bar { position: absolute; bottom: 100px; left: 24px; z-index: 10; display: flex; align-items: center; gap: 10px; background: rgba(20,20,24,0.8); backdrop-filter: blur(12px); border: 1px solid var(--bdr); border-radius: var(--pill); padding: 6px 16px; opacity: 0; transform: translateY(10px) scale(0.9); transition: all 0.3s cubic-bezier(.16,1,.3,1); pointer-events: none; box-shadow: var(--shadow-sm); }
.typing-bar.active { opacity: 1; transform: none; }
.t-dots { display: flex; gap: 4px; align-items: center; }
.t-dots span { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); animation: tdot 1.4s infinite cubic-bezier(.2,.8,.2,1); }
.t-dots span:nth-child(2){animation-delay:.16s} .t-dots span:nth-child(3){animation-delay:.32s}
@keyframes tdot{0%,80%,100%{transform:scale(0.8); opacity:0.4} 40%{transform:scale(1.2); opacity:1}}
#typing-txt { font-size: 12px; font-weight: 500; color: var(--t2); }

/* ── Floating Footer ── */
.chat-foot {
  position: absolute; bottom: 0; left: 0; right: 0; padding: 16px 24px; padding-bottom: calc(16px + var(--safe-b));
  background: linear-gradient(180deg, transparent 0%, rgba(3,3,3,0.7) 30%, rgba(3,3,3,0.95) 100%);
  pointer-events: none; z-index: 20; display: flex; flex-direction: column; align-items: center;
}
.file-preview {
  display: flex; align-items: center; justify-content: space-between; background: rgba(30,30,36,0.9);
  border: 1px solid var(--bdr2); border-radius: 16px; padding: 10px 14px; margin-bottom: 12px; gap: 12px;
  animation: msgSlideUp .3s cubic-bezier(.16,1,.3,1); box-shadow: 0 10px 30px rgba(0,0,0,0.5); backdrop-filter: blur(20px); pointer-events: all; width: 100%; max-width: 800px;
}
.fp-inner { display: flex; align-items: center; gap: 12px; min-width: 0; }
.fp-inner img { width: 56px; height: 56px; object-fit: cover; border-radius: 10px; box-shadow: inset 0 0 0 1px rgba(255,255,255,0.1); }
.fp-file { display: flex; align-items: center; gap: 10px; color: var(--t1); font-size: 14px; font-weight: 500; overflow: hidden; }
.fp-file span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 200px; }
.fp-remove { background: rgba(255,255,255,0.05); border: 1px solid var(--bdr); color: var(--t2); cursor: pointer; width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center; justify-content: center; transition: all .2s; flex-shrink: 0; }
.fp-remove:hover { color: var(--red); background: rgba(244,63,94,0.1); border-color: rgba(244,63,94,0.3); transform: scale(1.1); }
.input-row {
  display: flex; align-items: flex-end; gap: 8px; background: rgba(20,20,24,0.85);
  border: 1px solid rgba(255,255,255,0.1); border-radius: 30px; padding: 8px 10px 8px 16px;
  transition: all 0.3s cubic-bezier(.16,1,.3,1); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px); pointer-events: all; width: 100%; max-width: 800px; box-shadow: 0 10px 40px rgba(0,0,0,0.5);
}
.input-row:focus-within { background: rgba(26,26,32,0.95); border-color: rgba(59,130,246,0.6); box-shadow: 0 0 0 4px var(--adim), 0 10px 40px rgba(0,0,0,0.6); transform: translateY(-2px); }
.attach-btn {
  background: transparent; border: none; color: var(--t2); cursor: pointer; width: 40px; height: 40px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0; transition: all .2s; -webkit-tap-highlight-color: transparent; margin-bottom: 2px;
}
.attach-btn:hover { color: var(--accent); background: rgba(59,130,246,0.1); transform: scale(1.1); }
#msg-input {
  flex: 1; background: none; border: none; resize: none; max-height: 140px;
  font-family: var(--font); font-size: 15.5px; line-height: 1.5; color: var(--t1);
  outline: none; padding: 10px 0; -webkit-appearance: none; appearance: none;
}
#msg-input::placeholder { color: var(--t3); font-weight: 500; }
.send-btn {
  background: var(--accent-g); border: none; width: 42px; height: 42px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; color: #fff; cursor: pointer; flex-shrink: 0;
  transition: all 0.25s cubic-bezier(.16,1,.3,1); -webkit-tap-highlight-color: transparent; box-shadow: 0 4px 16px var(--aglow); margin-bottom: 1px;
}
.send-btn:hover { transform: translateY(-2px) scale(1.05); box-shadow: 0 8px 24px rgba(59,130,246,0.4); } 
.send-btn:active { transform: scale(0.9); }
.send-btn svg { transform: translateX(-1px); }

/* ── Record UI ── */
.record-ui {
  position: absolute; inset: 4px; border-radius: 26px;
  background: rgba(20,20,24,0.95); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  display: flex; align-items: center; gap: 12px; padding: 0 8px 0 16px; z-index: 10;
  animation: fadeIn .2s ease;
}
.rec-time { font-family: var(--mono); font-size: 14px; font-weight: 600; color: var(--red); flex-shrink: 0; min-width: 46px; }
.pulse-red { animation: recPulse 1.5s infinite alternate; }
@keyframes recPulse { from { opacity: 1; text-shadow: 0 0 10px rgba(244,63,94,0.6); } to { opacity: 0.5; text-shadow: none; } }
.rec-canvas { flex: 1; height: 32px; width: 100%; border-radius: 8px; }
.rec-cancel { background: rgba(255,255,255,0.05); border: 1px solid var(--bdr); color: var(--t2); width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all .2s; flex-shrink: 0; }
.rec-cancel:hover { color: var(--red); background: rgba(244,63,94,0.1); border-color: rgba(244,63,94,0.3); transform: scale(1.05); }
.rec-send { background: rgba(16,185,129,0.15); border: 1px solid rgba(16,185,129,0.3); color: var(--green); width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all .2s; flex-shrink: 0; }
.rec-send:hover { background: rgba(16,185,129,0.25); transform: translateY(-2px) scale(1.05); box-shadow: 0 4px 12px rgba(16,185,129,0.2); }
.rec-send svg { transform: translateX(-1px); }

/* ── Modals ── */
.modal-bg { position: fixed; inset: 0; z-index: 200; background: rgba(0,0,0,.8); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); display: flex; align-items: center; justify-content: center; padding: 24px; animation: fadeIn .3s ease; }
.modal-box { background: rgba(14,14,18,0.9); border: 1px solid rgba(255,255,255,0.1); border-radius: var(--r2); padding: 36px 32px; width: 100%; max-width: 380px; animation: msgSlideUp .4s cubic-bezier(.16,1,.3,1); text-align: center; box-shadow: 0 24px 64px rgba(0,0,0,0.8); }
.modal-box.sm { max-width: 260px; padding: 36px 28px; }
.modal-icon { width: 64px; height: 64px; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; }
.leave-icon { background: rgba(59,130,246,0.1); color: var(--accent); border: 1px solid rgba(59,130,246,0.25); box-shadow: 0 0 20px var(--aglow); }
.delete-icon { background: rgba(244,63,94,0.1); color: var(--red); border: 1px solid rgba(244,63,94,0.25); box-shadow: 0 0 20px rgba(244,63,94,0.2); }
.modal-box h3 { font-size: 20px; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 12px; }
.modal-box p { font-size: 14px; font-weight: 500; color: var(--t2); line-height: 1.6; margin-bottom: 28px; }
.modal-box p strong { color: var(--t1); }
.modal-btns { display: flex; gap: 12px; justify-content: center; }

/* ── Upload toast ── */
.upload-toast { position: fixed; bottom: 100px; left: 50%; transform: translateX(-50%); background: rgba(20,20,24,0.9); backdrop-filter: blur(16px); border: 1px solid var(--bdr2); border-radius: var(--pill); padding: 12px 24px; display: flex; align-items: center; gap: 14px; font-size: 14px; font-weight: 600; color: var(--t1); box-shadow: 0 12px 40px rgba(0,0,0,0.6); z-index: 300; min-width: 240px; overflow: hidden; animation: msgSlideUp .4s cubic-bezier(.16,1,.3,1); }
.ut-bar { position: absolute; left: 0; top: 0; bottom: 0; background: var(--adim); transition: width .3s ease; width: 0%; z-index: -1; }

/* ── Spinner ── */
.spinner { width: 40px; height: 40px; border-radius: 50%; border: 3px solid var(--bg3); border-top-color: var(--accent); animation: spin .8s cubic-bezier(.5,.1,.5,.9) infinite; margin: 0 auto; filter: drop-shadow(0 0 10px var(--aglow)); }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Shake ── */
@keyframes shake { 0%,100%{transform:translateX(0)} 20%{transform:translateX(-8px)} 40%{transform:translateX(8px)} 60%{transform:translateX(-4px)} 80%{transform:translateX(4px)} }

/* ── Mobile ── */
@media (max-width: 768px) {
  #s-chat { padding: 0; gap: 0; }
  .chat-main {
    border-radius: 0; border: none;
    /* remove backdrop-filter on mobile for performance */
    backdrop-filter: none; -webkit-backdrop-filter: none;
    background: var(--bg);
  }
  /* Disable expensive dot pattern on mobile */
  .chat-main::before { display: none; }
  .chat-head {
    position: static; transform: none; width: 100%;
    border-radius: 0; border: none; border-bottom: 1px solid var(--bdr);
    justify-content: space-between; padding-top: var(--safe-t);
    backdrop-filter: none; -webkit-backdrop-filter: none;
    background: rgba(10,10,12,0.98);
  }
  .chat-head:hover { transform: none; box-shadow: none; }
  .head-center { flex: 1; justify-content: flex-start; overflow: hidden; }
  .room-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .msgs-wrap { padding-top: 0; contain: strict; }
  .sidebar {
    position: fixed; left: 0; top: 0; bottom: 0; z-index: 60;
    transform: translateX(-100%); width: 85%; max-width: 320px;
    box-shadow: 20px 0 60px rgba(0,0,0,0.8); border-radius: 0;
    border: none; border-right: 1px solid var(--bdr);
    backdrop-filter: none; -webkit-backdrop-filter: none;
    background: rgba(10,10,12,0.98);
  }
  .sidebar.open { transform: translateX(0); }
  .sb-close { display: flex; }
  .menu-btn { display: flex; }
  .auth-wrap { padding: 32px 24px; }
  .bubble { max-width: 88%; }
  .img-bubble { max-width: 85%; }
  #msg-input { font-size: 16px; /* prevent iOS zoom */ }
  .chat-foot {
    padding: 12px 16px; padding-bottom: calc(12px + var(--safe-b));
    background: linear-gradient(180deg, transparent 0%, rgba(3,3,3,0.85) 35%, rgba(3,3,3,1) 100%);
  }
  .input-row { border-radius: 24px; padding: 6px 8px 6px 12px; }
  .typing-bar { bottom: 85px; left: 16px; }
  /* Reduce animation complexity on mobile */
  .msg-row { animation: msgSlideUp 0.25s ease-out; }
  .auth-wrap { backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
}
@media (max-width: 400px) {
  .auth-wrap { padding: 28px 20px; }
  .id-value { font-size: 20px; }
  .attach-btn { padding: 6px; }
}