/* ═══════════════════════════════════════════════════════
   PulseChat — Premium Chat App Styles
   ═══════════════════════════════════════════════════════ */

/* ── Reset & Variables ───────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Colors */
  --bg:           #09090f;
  --bg2:          #0f0f1a;
  --surface:      #13131f;
  --surface2:     #1a1a2e;
  --surface3:     #22223a;
  --border:       rgba(255,255,255,0.06);
  --border2:      rgba(255,255,255,0.1);

  --accent:       #7c6ff7;
  --accent-dark:  #4f46e5;
  --accent-glow:  rgba(124,111,247,0.3);
  --accent2:      #a78bfa;

  --green:        #22c55e;
  --red:          #ef4444;

  --text:         #f0f0fa;
  --text2:        #9494b0;
  --text3:        #5a5a7a;

  /* Messaging */
  --bubble-out:   linear-gradient(135deg, #7c6ff7, #4f46e5);
  --bubble-in:    #1e1e38;
  --bubble-out-text: #fff;
  --bubble-in-text: #e0e0f5;

  /* Layout */
  --sidebar-w: 300px;
  --radius:    16px;
  --radius-sm: 10px;
  --radius-xs: 6px;

  /* Typography */
  --font: 'Inter', system-ui, sans-serif;

  /* Transitions */
  --t: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  --t-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  --t-smooth: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

html, body {
  height: 100%;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

input, textarea, button { font-family: var(--font); }
.hidden { display: none !important; }
button { cursor: pointer; border: none; background: none; }

/* ── Scrollbar ───────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--surface3); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: var(--surface3); }

/* ══════════════════════════════════════════════════════
   SPLASH
   ══════════════════════════════════════════════════════ */
#splash {
  position: fixed; inset: 0; z-index: 1000;
  background: var(--bg);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 2rem;
  transition: opacity 0.5s ease;
}
#splash.fade-out { opacity: 0; pointer-events: none; }

.splash-logo {
  display: flex; align-items: center; gap: 0.75rem;
  animation: splashPop 0.6s var(--t-spring) both;
}
.splash-icon { width: 52px; height: 52px; }
.splash-logo span {
  font-size: 1.8rem; font-weight: 700;
  background: linear-gradient(135deg, var(--accent2), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.splash-bar {
  width: 160px; height: 3px;
  background: var(--surface3);
  border-radius: 4px;
  overflow: hidden;
  animation: splashPop 0.6s 0.2s var(--t-spring) both;
}
.splash-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-dark), var(--accent2));
  border-radius: 4px;
  animation: fillBar 1.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes splashPop {
  from { opacity: 0; transform: scale(0.8) translateY(12px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}
@keyframes fillBar {
  from { width: 0%; }
  to   { width: 100%; }
}

/* ══════════════════════════════════════════════════════
   PAGES
   ══════════════════════════════════════════════════════ */
.page { position: fixed; inset: 0; }

/* ══════════════════════════════════════════════════════
   AUTH SCREEN
   ══════════════════════════════════════════════════════ */
#auth-screen {
  display: flex; align-items: center; justify-content: center;
  padding: 1.5rem;
  overflow-y: auto;
}

/* Background */
.auth-bg {
  position: absolute; inset: 0; z-index: 0;
  background: radial-gradient(ellipse at 15% 50%, rgba(79,70,229,0.2) 0%, transparent 55%),
              radial-gradient(ellipse at 85% 20%, rgba(124,111,247,0.15) 0%, transparent 55%),
              radial-gradient(ellipse at 60% 80%, rgba(167,139,250,0.1) 0%, transparent 45%),
              var(--bg);
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  animation: orbDrift 10s ease-in-out infinite alternate;
  pointer-events: none;
}
.orb1 { width: 600px; height: 600px; background: rgba(124,111,247,0.12); top: -20%; left: -15%; animation-delay: 0s; }
.orb2 { width: 400px; height: 400px; background: rgba(59,130,246,0.08); bottom: -10%; right: -10%; animation-delay: 3.5s; }
.orb3 { width: 300px; height: 300px; background: rgba(167,139,250,0.1); top: 40%; left: 45%; animation-delay: 7s; }

.grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, transparent 20%, black 80%);
}

@keyframes orbDrift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(40px, -30px) scale(1.08); }
}

/* Auth Layout */
.auth-container {
  position: relative; z-index: 1;
  display: flex; gap: 4rem;
  align-items: center;
  max-width: 900px; width: 100%;
  animation: authIn 0.7s var(--t-spring) both;
}

@keyframes authIn {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Brand panel */
.auth-brand { flex: 1; min-width: 0; }

.brand-logo {
  display: flex; align-items: center; gap: 0.8rem;
  margin-bottom: 1.25rem;
}
.brand-logo h1 {
  font-size: 2rem; font-weight: 800; letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--accent2), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-sub {
  font-size: 1.05rem; line-height: 1.6;
  color: var(--text2); margin-bottom: 2rem;
}

.brand-features { display: flex; flex-direction: column; gap: 0.7rem; }
.feat {
  display: flex; align-items: center; gap: 0.6rem;
  font-size: 0.875rem; color: var(--text2);
}
.feat-dot {
  width: 8px; height: 8px; flex-shrink: 0;
  background: var(--accent); border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-glow);
}

/* Auth card */
.auth-card {
  flex-shrink: 0; width: 400px;
  background: rgba(19,19,31,0.85);
  backdrop-filter: blur(24px) saturate(1.4);
  border: 1px solid var(--border2);
  border-radius: 24px;
  padding: 2rem;
  box-shadow:
    0 0 0 1px rgba(124,111,247,0.08),
    0 40px 100px rgba(0,0,0,0.6),
    inset 0 1px 0 rgba(255,255,255,0.06);
}

/* Tabs */
.auth-tabs {
  position: relative;
  display: flex;
  background: var(--surface2);
  border-radius: var(--radius-sm);
  padding: 4px;
  margin-bottom: 1.75rem;
  gap: 0;
}
.atab {
  flex: 1; position: relative; z-index: 1;
  padding: 0.55rem 0.5rem;
  font-size: 0.85rem; font-weight: 500;
  color: var(--text2);
  border-radius: 8px;
  transition: color var(--t);
}
.atab.active { color: #fff; }
.atab-indicator {
  position: absolute; left: 4px; top: 4px;
  width: calc(50% - 4px); height: calc(100% - 8px);
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border-radius: 8px;
  transition: transform 0.35s cubic-bezier(0.34,1.2,0.64,1);
  box-shadow: 0 4px 16px var(--accent-glow);
}

/* Form */
.aform { display: flex; flex-direction: column; gap: 1rem; }

.field { display: flex; flex-direction: column; gap: 0.35rem; }

.field label {
  font-size: 0.78rem; font-weight: 600;
  color: var(--text2); letter-spacing: 0.02em;
  display: flex; align-items: center; gap: 0.3rem;
}
.label-hint { font-weight: 400; color: var(--text3); }

.field-wrap {
  position: relative;
  display: flex; align-items: center;
}
.field-wrap input {
  width: 100%;
  padding: 0.7rem 1rem 0.7rem 2.6rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--t), box-shadow var(--t), background var(--t);
}
.field-wrap input:focus {
  border-color: var(--accent);
  background: var(--surface3);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.field-wrap input::placeholder { color: var(--text3); }

.field-icon {
  position: absolute; left: 0.75rem;
  width: 16px; height: 16px;
  color: var(--text3);
  pointer-events: none;
}
.field-prefix {
  position: absolute; left: 0.9rem;
  font-weight: 600; color: var(--accent);
  pointer-events: none; font-size: 0.95rem;
}
.field-wrap:has(.field-prefix) input { padding-left: 1.8rem; }

.err-msg { font-size: 0.8rem; color: #f87171; min-height: 0.9rem; }

.btn-submit {
  margin-top: 0.3rem; padding: 0.85rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff; border-radius: var(--radius-sm);
  font-size: 0.95rem; font-weight: 600;
  display: flex; align-items: center; justify-content: center;
  gap: 0.5rem;
  transition: opacity var(--t), transform var(--t), box-shadow var(--t);
  box-shadow: 0 4px 24px var(--accent-glow);
  position: relative; overflow: hidden;
}
.btn-submit::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
  opacity: 0;
  transition: opacity var(--t);
}
.btn-submit:hover { opacity: 0.92; transform: translateY(-1px); box-shadow: 0 8px 32px var(--accent-glow); }
.btn-submit:hover::before { opacity: 1; }
.btn-submit:active { transform: translateY(0); }
.btn-submit:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-spin {
  width: 18px; height: 18px;
  border: 2px solid rgba(255,255,255,0.25);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.65s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ══════════════════════════════════════════════════════
   CHAT SCREEN
   ══════════════════════════════════════════════════════ */
#chat-screen { display: flex; }

.chat-layout {
  display: flex;
  width: 100%; height: 100vh;
  overflow: hidden;
}

/* ── SIDEBAR ─────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
}

/* Profile area */
.sidebar-top { flex-shrink: 0; }

.my-profile {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 1rem 0.9rem;
  border-bottom: 1px solid var(--border);
}
.my-avatar {
  width: 38px; height: 38px; flex-shrink: 0;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.85rem; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
}
.my-info { flex: 1; min-width: 0; }
.my-name {
  display: block; font-size: 0.88rem; font-weight: 600;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.my-username {
  display: block; font-size: 0.75rem; color: var(--accent2);
  font-weight: 500;
}

.icon-btn {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text3); border-radius: var(--radius-xs);
  transition: background var(--t), color var(--t);
  flex-shrink: 0;
}
.icon-btn svg { width: 16px; height: 16px; }
.icon-btn:hover { background: var(--surface2); color: var(--text); }
.icon-btn:hover:first-child { background: rgba(239,68,68,0.15); color: var(--red); }

/* Search */
.search-wrap {
  display: flex; align-items: center;
  position: relative;
  margin: 0.75rem;
}
.search-icon {
  position: absolute; left: 0.75rem;
  width: 15px; height: 15px; color: var(--text3);
}
#search-input {
  width: 100%;
  padding: 0.6rem 2.2rem 0.6rem 2.2rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 30px;
  color: var(--text); font-size: 0.85rem;
  outline: none;
  transition: border-color var(--t), box-shadow var(--t);
}
#search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
#search-input::placeholder { color: var(--text3); }
.search-clear {
  position: absolute; right: 0.75rem;
  font-size: 0.75rem; color: var(--text3);
  width: 18px; height: 18px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  transition: background var(--t), color var(--t);
}
.search-clear:hover { background: var(--surface3); color: var(--text); }

/* Panel labels */
.panel-label {
  font-size: 0.68rem; font-weight: 700; letter-spacing: 0.1em;
  color: var(--text3);
  padding: 0 0.9rem 0.5rem;
}

/* Search results */
.search-results {
  flex-shrink: 0;
  padding-top: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.search-loading, .search-empty {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 1.5rem 1rem; gap: 0.5rem;
  color: var(--text2); font-size: 0.85rem; text-align: center;
}
.search-empty span { font-size: 1.8rem; }
.mini-spin {
  width: 22px; height: 22px;
  border: 2px solid var(--surface3);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.65s linear infinite;
}

.search-result-item {
  display: flex; align-items: center; gap: 0.7rem;
  padding: 0.65rem 0.9rem;
  cursor: pointer;
  transition: background var(--t);
}
.search-result-item:hover { background: var(--surface2); }

.start-chat-btn {
  margin-left: auto; flex-shrink: 0;
  padding: 0.4rem 0.75rem;
  background: var(--accent);
  color: #fff; border-radius: 20px;
  font-size: 0.78rem; font-weight: 600;
  transition: background var(--t), transform var(--t);
}
.start-chat-btn:hover { background: var(--accent2); transform: scale(1.04); }

/* Conversations list */
.convos-panel { flex: 1; overflow-y: auto; padding-top: 0.75rem; }

.convo-item {
  display: flex; align-items: center; gap: 0.7rem;
  padding: 0.65rem 0.9rem;
  cursor: pointer;
  border-radius: var(--radius-xs);
  margin: 0 0.4rem 2px;
  transition: background var(--t), transform var(--t);
  animation: convoSlideIn 0.3s var(--t-spring) both;
}
@keyframes convoSlideIn {
  from { opacity: 0; transform: translateX(-16px); }
  to   { opacity: 1; transform: translateX(0); }
}
.convo-item:hover { background: var(--surface2); }
.convo-item.active {
  background: linear-gradient(135deg, rgba(124,111,247,0.15), rgba(79,70,229,0.1));
  border: 1px solid rgba(124,111,247,0.2);
}

.ci-avatar {
  width: 44px; height: 44px; flex-shrink: 0;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1rem; color: #fff;
}
.ci-body { flex: 1; min-width: 0; }
.ci-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 3px; }
.ci-name { font-size: 0.9rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ci-username { font-size: 0.75rem; color: var(--accent2); }
.ci-time { font-size: 0.72rem; color: var(--text3); flex-shrink: 0; }
.ci-bottom { display: flex; align-items: center; justify-content: space-between; }
.ci-preview { font-size: 0.8rem; color: var(--text2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.unread-badge {
  background: var(--accent); color: #fff;
  font-size: 0.7rem; font-weight: 700;
  min-width: 18px; height: 18px;
  border-radius: 18px; padding: 0 5px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

.empty-convos {
  text-align: center; padding: 2.5rem 1.5rem;
  color: var(--text2);
}
.empty-icon { font-size: 2.5rem; margin-bottom: 0.5rem; }
.empty-convos p { font-size: 0.85rem; }
.empty-hint { font-size: 0.78rem; color: var(--text3); margin-top: 0.25rem; line-height: 1.5; }

/* ── MAIN CHAT ───────────────────────────────────────── */
.chat-main {
  flex: 1; display: flex; flex-direction: column;
  min-width: 0;
  background: var(--bg2);
  position: relative;
  overflow: hidden;
}

/* Empty state */
.empty-state {
  flex: 1; display: flex; align-items: center; justify-content: center;
}
.empty-state-inner { text-align: center; }
.es-icon { margin-bottom: 1.25rem; }
.empty-state-inner h2 { font-size: 1.2rem; font-weight: 600; margin-bottom: 0.5rem; }
.empty-state-inner p { font-size: 0.875rem; color: var(--text2); line-height: 1.6; }

/* Active chat */
.active-chat {
  flex: 1; display: flex; flex-direction: column;
  min-height: 0;
}
.slide-in { animation: slideInChat 0.45s var(--t-spring) both; }
@keyframes slideInChat {
  from { opacity: 0; transform: translateX(30px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* Chat header */
.chat-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.9rem 1.4rem;
  background: rgba(13,13,26,0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.chat-peer-info { display: flex; align-items: center; gap: 0.75rem; }
.peer-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; color: #fff; font-size: 0.9rem;
}
.peer-details { display: flex; flex-direction: column; }
.peer-name { font-size: 0.95rem; font-weight: 600; }
.peer-status {
  display: flex; align-items: center; gap: 0.35rem;
  font-size: 0.75rem; color: var(--text2);
}
.status-indicator {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 5px var(--green);
  animation: statusPulse 2.5s ease-in-out infinite;
}
.status-indicator.offline { background: var(--text3); box-shadow: none; animation: none; }
@keyframes statusPulse {
  0%,100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.chat-header-actions { display: flex; gap: 0.25rem; }

/* Messages area */
.messages-area {
  flex: 1; overflow-y: auto;
  padding: 1.25rem 1.4rem 0.5rem;
  display: flex; flex-direction: column; gap: 3px;
  scroll-behavior: smooth;
  background:
    radial-gradient(ellipse at 80% 20%, rgba(79,70,229,0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 20% 80%, rgba(124,111,247,0.04) 0%, transparent 50%),
    var(--bg2);
}

/* Date divider */
.date-divider {
  display: flex; align-items: center; justify-content: center;
  margin: 1rem 0;
}
.date-divider span {
  font-size: 0.72rem; font-weight: 600; color: var(--text3);
  background: var(--surface2);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  border: 1px solid var(--border);
}

/* Messages */
.msg {
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
  animation: msgPop 0.3s var(--t-spring) both;
  max-width: 100%;
}
@keyframes msgPop {
  from { opacity: 0; transform: translateY(10px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.msg-in { justify-content: flex-start; }
.msg-out { justify-content: flex-end; }

.msg-in.msg-first { margin-top: 0.75rem; }
.msg-out + .msg-out { margin-top: 1px; }
.msg-in + .msg-in { margin-top: 1px; }

.bubble {
  max-width: 65%;
  padding: 0.6rem 0.85rem;
  border-radius: 18px;
  position: relative;
  word-break: break-word;
  white-space: pre-wrap;
  transition: transform 0.1s;
}
.bubble:active { transform: scale(0.98); }

.msg-out .bubble {
  background: var(--bubble-out);
  color: var(--bubble-out-text);
  border-bottom-right-radius: 4px;
  box-shadow: 0 4px 20px rgba(124,111,247,0.3);
}
.msg-in .bubble {
  background: var(--bubble-in);
  color: var(--bubble-in-text);
  border-bottom-left-radius: 4px;
  border: 1px solid var(--border);
}

.bubble-text { font-size: 0.9rem; line-height: 1.5; }

.bubble-meta {
  display: flex; align-items: center; justify-content: flex-end;
  gap: 0.25rem;
  margin-top: 0.2rem;
}
.bubble-time { font-size: 0.68rem; opacity: 0.6; }
.bubble-tick { font-size: 0.7rem; color: #93c5fd; }

.msg-spacer { width: 0; }

/* ── COMPOSER ─────────────────────────────────────────── */
.composer {
  flex-shrink: 0;
  padding: 0.85rem 1rem;
  background: var(--surface);
  border-top: 1px solid var(--border);
}
.composer-inner {
  display: flex; align-items: flex-end; gap: 0.5rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 0.45rem 0.5rem 0.45rem 0.7rem;
  transition: border-color var(--t), box-shadow var(--t);
  position: relative;
}
.composer-inner:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.composer-btn {
  width: 36px; height: 36px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  color: var(--text3); border-radius: 50%;
  transition: background var(--t), color var(--t), transform var(--t);
  position: relative;
}
.composer-btn svg { width: 20px; height: 20px; }
.composer-btn:hover { background: var(--surface3); color: var(--accent2); transform: scale(1.1); }

/* Emoji picker */
.emoji-picker {
  position: absolute; bottom: calc(100% + 10px); left: 0;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: var(--radius);
  padding: 0.75rem;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  z-index: 100;
  animation: emojiIn 0.25s var(--t-spring) both;
  min-width: 220px;
}
@keyframes emojiIn {
  from { opacity: 0; transform: translateY(8px) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.emoji-grid {
  display: grid; grid-template-columns: repeat(10, 1fr);
  gap: 2px;
}
.emoji-btn-item {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  border-radius: var(--radius-xs);
  transition: background var(--t), transform var(--t);
}
.emoji-btn-item:hover { background: var(--surface2); transform: scale(1.25); }

#msg-input {
  flex: 1;
  background: transparent; border: none; outline: none;
  color: var(--text); font-size: 0.9rem;
  resize: none; max-height: 140px;
  line-height: 1.5; padding: 0.2rem 0;
  align-self: center;
}
#msg-input::placeholder { color: var(--text3); }

.send-btn {
  width: 38px; height: 38px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  transition: transform var(--t), box-shadow var(--t), opacity var(--t);
  box-shadow: 0 4px 14px var(--accent-glow);
}
.send-btn svg { width: 16px; height: 16px; }
.send-btn:hover { transform: scale(1.08) rotate(-5deg); box-shadow: 0 6px 22px var(--accent-glow); }
.send-btn:active { transform: scale(0.94) rotate(-5deg); }

/* ══════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════ */
@media (max-width: 720px) {
  .auth-brand { display: none; }
  .auth-container { justify-content: center; }
  .auth-card { width: 100%; max-width: 420px; }

  :root { --sidebar-w: 100%; }
  .chat-layout { flex-direction: column; }
  .sidebar { width: 100%; height: 45vh; border-right: none; border-bottom: 1px solid var(--border); }
  .active-chat { height: 55vh; }
}

@media (max-width: 480px) {
  .auth-card { padding: 1.5rem 1.25rem; border-radius: 20px; }
}