/* HowsApp Design System — Part 1 of 1 */
/* Dark theme, mobile-first, glass-morphism, smooth animations */

:root {
  --bg-primary: #0a0a1a;
  --bg-secondary: #111128;
  --bg-tertiary: #1a1a3e;
  --bg-surface: #16163a;
  --bg-hover: #1e1e4a;
  --text-primary: #e8e8f0;
  --text-secondary: #9898b8;
  --text-muted: #5c5c80;
  --accent: #6c63ff;
  --accent-light: #8b83ff;
  --accent-glow: rgba(108, 99, 255, 0.3);
  --teal: #3de0c2;
  --teal-glow: rgba(61, 224, 194, 0.3);
  --danger: #ff4757;
  --success: #2ed573;
  --bubble-sent: linear-gradient(135deg, #6c63ff 0%, #5848e0 100%);
  --bubble-received: #1e1e4a;
  --glass: rgba(20, 20, 50, 0.8);
  --glass-border: rgba(108, 99, 255, 0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 50%;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --transition: 0.2s ease;
  --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
  height: 100%;
  overflow: hidden;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

input, textarea, button { font-family: inherit; font-size: inherit; }
button { cursor: pointer; border: none; background: none; color: inherit; }
#app { height: 100%; position: relative; overflow: hidden; }

.view {
  position: absolute; inset: 0; opacity: 0; pointer-events: none;
  transition: opacity var(--transition-slow); display: flex;
}
.view.active { opacity: 1; pointer-events: all; z-index: 1; }

/* Setup Screen */
#view-setup {
  align-items: center; justify-content: center;
  background: radial-gradient(ellipse at 30% 20%, rgba(108,99,255,0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 80%, rgba(61,224,194,0.06) 0%, transparent 60%),
              var(--bg-primary);
}
.setup-container { width: 100%; max-width: 400px; padding: 40px 24px; text-align: center; }
.setup-logo { margin-bottom: 48px; }
.logo-icon { width: 88px; height: 88px; margin: 0 auto 20px; animation: float 3s ease-in-out infinite; }
.logo-icon svg { width: 100%; height: 100%; }
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-8px)} }
.setup-logo h1 {
  font-size: 32px; font-weight: 700;
  background: linear-gradient(135deg, var(--accent-light), var(--teal));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.tagline { color: var(--text-secondary); margin-top: 8px; font-size: 14px; letter-spacing: 1px; }
.setup-form { margin-bottom: 40px; }
.input-group { position: relative; margin-bottom: 24px; }
.input-group input {
  width: 100%; padding: 16px 0; font-size: 16px; background: none; border: none;
  border-bottom: 2px solid var(--bg-tertiary); color: var(--text-primary); outline: none;
  transition: border-color var(--transition);
}
.input-group input::placeholder { color: var(--text-muted); }
.input-group input:focus { border-bottom-color: var(--accent); }
.input-line {
  position: absolute; bottom: 0; left: 50%; width: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--teal));
  transition: width var(--transition-slow), left var(--transition-slow);
}
.input-group input:focus ~ .input-line { width: 100%; left: 0; }

.btn-primary {
  display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px;
  background: linear-gradient(135deg, var(--accent), #5040e0); color: white;
  border-radius: var(--radius-xl); font-size: 16px; font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px var(--accent-glow); }
.btn-primary:active { transform: translateY(0); }
.btn-arrow { width: 20px; height: 20px; }
.encryption-badge {
  display: inline-flex; align-items: center; gap: 6px; padding: 8px 16px;
  background: var(--bg-secondary); border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl); color: var(--teal); font-size: 12px; font-weight: 500;
}
.encryption-badge svg { width: 14px; height: 14px; }

/* Main Layout */
#view-main { flex-direction: row; padding-top: var(--safe-top); padding-bottom: var(--safe-bottom); }
.sidebar {
  width: 100%; max-width: 360px; background: var(--bg-secondary);
  border-right: 1px solid var(--glass-border); display: flex; flex-direction: column;
  transition: transform var(--transition-slow);
}
.sidebar-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 20px 16px; border-bottom: 1px solid var(--glass-border);
}
.sidebar-header h2 { font-size: 22px; font-weight: 700; }
.contact-list { flex: 1; overflow-y: auto; -webkit-overflow-scrolling: touch; }
.contact-item {
  display: flex; align-items: center; gap: 14px; padding: 14px 20px;
  cursor: pointer; transition: background var(--transition); position: relative;
}
.contact-item:hover { background: var(--bg-hover); }
.contact-item.active { background: var(--bg-tertiary); }
.contact-item .avatar { width: 48px; height: 48px; flex-shrink: 0; }
.contact-item .contact-info { flex: 1; min-width: 0; }
.contact-info .contact-name { font-weight: 600; font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.contact-info .contact-preview { font-size: 13px; color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-top: 2px; }
.contact-item .contact-time { font-size: 11px; color: var(--text-muted); flex-shrink: 0; align-self: flex-start; margin-top: 4px; }
.online-dot { width: 10px; height: 10px; background: var(--success); border-radius: 50%; border: 2px solid var(--bg-secondary); position: absolute; bottom: 14px; left: 50px; }
.empty-state { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 60px 20px; color: var(--text-muted); text-align: center; }
.empty-state svg { width: 64px; height: 64px; margin-bottom: 16px; opacity: 0.4; }
.empty-state p { font-size: 16px; font-weight: 500; margin-bottom: 4px; }
.empty-state span { font-size: 13px; }

.avatar {
  width: 40px; height: 40px; border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--accent), var(--teal));
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 16px; color: white; flex-shrink: 0;
}

/* Chat Area */
.chat-area { flex: 1; display: flex; flex-direction: column; background: var(--bg-primary); min-width: 0; position: relative; }
.chat-empty { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; color: var(--text-muted); text-align: center; padding: 20px; }
.chat-empty svg { width: 80px; height: 80px; margin-bottom: 20px; opacity: 0.2; }
.chat-empty h3 { font-size: 18px; margin-bottom: 8px; color: var(--text-secondary); }

.chat-header {
  display: flex; align-items: center; gap: 12px; padding: 12px 16px;
  background: var(--glass); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border); z-index: 2;
}
.chat-header-info { display: flex; align-items: center; gap: 12px; flex: 1; min-width: 0; }
.chat-header-info h3 { font-size: 16px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.status-text { font-size: 12px; color: var(--text-muted); }
.status-text.online { color: var(--success); }
.chat-header-actions { display: flex; gap: 4px; }
.back-btn { display: none; }

.icon-btn {
  width: 40px; height: 40px; border-radius: var(--radius-full);
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition);
}
.icon-btn:hover { background: var(--bg-hover); }
.icon-btn svg { width: 20px; height: 20px; }

/* Messages */
.messages-container { flex: 1; overflow-y: auto; -webkit-overflow-scrolling: touch; padding: 16px; }
.messages-list { display: flex; flex-direction: column; gap: 4px; min-height: 100%; justify-content: flex-end; }
.message {
  max-width: 75%; padding: 10px 14px; border-radius: var(--radius-lg);
  font-size: 14px; line-height: 1.5; position: relative;
  animation: messageIn 0.3s ease; word-wrap: break-word;
}
@keyframes messageIn { from{opacity:0;transform:translateY(10px) scale(0.95)} to{opacity:1;transform:translateY(0) scale(1)} }
.message.sent { align-self: flex-end; background: var(--bubble-sent); color: white; border-bottom-right-radius: 6px; }
.message.received { align-self: flex-start; background: var(--bubble-received); border-bottom-left-radius: 6px; }
.message-meta { display: flex; align-items: center; justify-content: flex-end; gap: 4px; margin-top: 4px; font-size: 11px; opacity: 0.7; }
.message-media { max-width: 100%; border-radius: var(--radius-md); margin-bottom: 6px; }
.message-media img { width: 100%; border-radius: var(--radius-md); cursor: pointer; }

.audio-message { display: flex; align-items: center; gap: 10px; min-width: 200px; }
.audio-play-btn { width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,0.2); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.audio-play-btn svg { width: 16px; height: 16px; }
.audio-waveform { flex: 1; height: 30px; display: flex; align-items: center; gap: 2px; }
.audio-waveform .bar { width: 3px; background: currentColor; border-radius: 2px; opacity: 0.6; }
.audio-duration { font-size: 12px; opacity: 0.8; flex-shrink: 0; }

.typing-indicator { display:flex; align-items:center; gap:4px; padding:12px 16px; background:var(--bubble-received); border-radius:var(--radius-lg); border-bottom-left-radius:6px; align-self:flex-start; max-width:80px; }
.typing-indicator .dot { width:6px; height:6px; background:var(--text-muted); border-radius:50%; animation:typingBounce 1.4s ease-in-out infinite; }
.typing-indicator .dot:nth-child(2){animation-delay:.2s} .typing-indicator .dot:nth-child(3){animation-delay:.4s}
@keyframes typingBounce { 0%,60%,100%{transform:translateY(0)} 30%{transform:translateY(-6px)} }

.message-input-bar {
  display: flex; align-items: flex-end; gap: 8px; padding: 8px 12px;
  padding-bottom: calc(8px + var(--safe-bottom));
  background: var(--bg-secondary); border-top: 1px solid var(--glass-border);
}
.input-wrapper { flex: 1; background: var(--bg-tertiary); border-radius: var(--radius-lg); padding: 2px; }
.input-wrapper textarea { width: 100%; padding: 10px 14px; background: none; border: none; color: var(--text-primary); font-size: 14px; line-height: 1.5; resize: none; outline: none; max-height: 120px; }
.input-wrapper textarea::placeholder { color: var(--text-muted); }
.send-btn { color: var(--accent-light); }
.send-btn:hover { background: var(--accent-glow); }

.recording-bar { display:flex; align-items:center; gap:12px; padding:12px 16px; padding-bottom:calc(12px + var(--safe-bottom)); background:var(--bg-secondary); border-top:1px solid var(--glass-border); }
.recording-pulse { width:12px; height:12px; border-radius:50%; background:var(--danger); animation:pulse 1s ease-in-out infinite; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.5;transform:scale(.8)} }
.recording-time { font-size:14px; font-weight:600; flex:1; color:var(--danger); }

/* Pairing Modal */
.modal { position:fixed; inset:0; z-index:100; display:flex; align-items:center; justify-content:center; background:rgba(0,0,0,0.6); backdrop-filter:blur(8px); -webkit-backdrop-filter:blur(8px); opacity:0; pointer-events:none; transition:opacity var(--transition-slow); }
.modal.active { opacity:1; pointer-events:all; }
.modal-content { width:90%; max-width:420px; max-height:90vh; background:var(--bg-secondary); border:1px solid var(--glass-border); border-radius:var(--radius-lg); overflow:hidden; box-shadow:var(--shadow-lg); animation:modalIn .3s ease; }
@keyframes modalIn { from{transform:scale(.9) translateY(20px);opacity:0} to{transform:scale(1) translateY(0);opacity:1} }
.modal-header { display:flex; align-items:center; justify-content:space-between; padding:16px 20px; border-bottom:1px solid var(--glass-border); }
.modal-header h3 { font-size:18px; font-weight:600; }
.pair-tabs { display:flex; border-bottom:1px solid var(--glass-border); }
.pair-tab { flex:1; padding:12px; font-size:14px; font-weight:500; color:var(--text-muted); transition:color var(--transition),border-color var(--transition); border-bottom:2px solid transparent; }
.pair-tab.active { color:var(--accent-light); border-bottom-color:var(--accent); }
.pair-panel { display:none; padding:24px; }
.pair-panel.active { display:block; }
.qr-container { display:flex; flex-direction:column; align-items:center; gap:16px; }
.qr-code-image { width:240px; height:240px; border-radius:var(--radius-md); background:white; padding:12px; }
.qr-timer { font-size:13px; color:var(--text-secondary); }
.qr-loading { width:240px; height:240px; display:flex; align-items:center; justify-content:center; color:var(--text-muted); border:2px dashed var(--glass-border); border-radius:var(--radius-md); }
.qr-actions { display:flex; gap:10px; justify-content:center; padding:12px 0 0; }
.btn-secondary {
  display:inline-flex; align-items:center; gap:6px; padding:10px 18px;
  background:var(--bg-tertiary); color:var(--text-primary); border-radius:var(--radius-xl);
  font-size:14px; font-weight:500; border:1px solid var(--glass-border);
  transition:background var(--transition), transform var(--transition);
}
.btn-secondary:hover { background:var(--bg-hover); transform:translateY(-1px); }
.qr-hint { text-align:center; font-size:12px; color:var(--text-muted); padding:12px 0 0; max-width:280px; margin:0 auto; line-height:1.5; }
.scanner-container { position:relative; width:100%; aspect-ratio:1; border-radius:var(--radius-md); overflow:hidden; background:#000; }
.scanner-container video { width:100%; height:100%; object-fit:cover; }
.scanner-overlay { position:absolute; inset:0; display:flex; align-items:center; justify-content:center; }
.scanner-frame { width:200px; height:200px; border:2px solid var(--teal); border-radius:var(--radius-md); box-shadow:0 0 0 3000px rgba(0,0,0,0.5); animation:scanPulse 2s ease-in-out infinite; }
@keyframes scanPulse { 0%,100%{border-color:var(--teal)} 50%{border-color:var(--accent-light)} }
.scan-divider { display:flex; align-items:center; gap:12px; padding:16px 0 12px; color:var(--text-muted); font-size:13px; }
.scan-divider::before,.scan-divider::after { content:''; flex:1; height:1px; background:var(--glass-border); }
.scan-upload-btn { width:100%; justify-content:center; }
.scan-choice { display:flex; flex-direction:column; gap:12px; padding:20px 0; }
.scan-choice-label { text-align:center; font-size:14px; color:var(--text-secondary); margin:0; }
.scan-choice-btn { width:100%; justify-content:center; padding:14px 20px; font-size:15px; }

/* Call Screen */
.call-screen { flex-direction:column; align-items:center; justify-content:center; background:var(--bg-primary); }
.call-bg { position:absolute; inset:0; background:radial-gradient(ellipse at 50% 30%,rgba(108,99,255,.15) 0%,transparent 60%); z-index:0; }
#remote-video { position:absolute; inset:0; width:100%; height:100%; object-fit:cover; z-index:1; display:none; }
.self-view { position:absolute; top:calc(20px + var(--safe-top)); right:20px; width:120px; height:160px; border-radius:var(--radius-md); object-fit:cover; z-index:3; border:2px solid var(--glass-border); box-shadow:var(--shadow); display:none; }
.call-info { position:relative; z-index:2; text-align:center; }
.call-avatar { width:100px; height:100px; border-radius:50%; background:linear-gradient(135deg,var(--accent),var(--teal)); display:flex; align-items:center; justify-content:center; font-size:36px; font-weight:700; color:white; margin:0 auto 20px; box-shadow:0 0 60px var(--accent-glow); }
.call-info h2 { font-size:24px; margin-bottom:8px; }
#call-status-text { color:var(--text-secondary); font-size:14px; }
.call-controls { position:absolute; bottom:calc(60px + var(--safe-bottom)); left:50%; transform:translateX(-50%); display:flex; gap:24px; z-index:4; }
.call-btn { width:60px; height:60px; border-radius:50%; background:var(--bg-tertiary); display:flex; align-items:center; justify-content:center; transition:background var(--transition),transform var(--transition); border:1px solid var(--glass-border); }
.call-btn:hover { transform:scale(1.1); }
.call-btn svg { width:24px; height:24px; }
.call-btn.end-call { background:var(--danger); border-color:var(--danger); transform:rotate(135deg); }
.call-btn.end-call:hover { background:#e83d4d; }
.incoming-call { position:absolute; inset:0; background:var(--bg-primary); z-index:10; display:flex; flex-direction:column; align-items:center; justify-content:center; }
.incoming-call h2 { font-size:24px; margin-bottom:8px; }
#incoming-type { color:var(--text-secondary); margin-bottom:60px; }
.call-avatar.incoming { animation:incomingPulse 2s ease-in-out infinite; }
@keyframes incomingPulse { 0%,100%{box-shadow:0 0 40px var(--accent-glow)} 50%{box-shadow:0 0 80px var(--accent-glow),0 0 120px rgba(108,99,255,.1)} }
.incoming-actions { display:flex; gap:48px; }
.call-btn.reject { background:var(--danger); border-color:var(--danger); }
.call-btn.accept { background:var(--success); border-color:var(--success); }
.call-btn.active { background:rgba(255,50,50,0.3); border-color:var(--danger); }
.call-btn.active svg { opacity:0.5; }

/* PWA Install Banner */
.install-banner {
  position:fixed; bottom:0; left:0; right:0; z-index:50;
  background:var(--glass); backdrop-filter:blur(20px); -webkit-backdrop-filter:blur(20px);
  border-top:1px solid var(--glass-border); padding:16px 20px;
  padding-bottom:calc(16px + var(--safe-bottom));
  animation:slideUp .4s ease;
}
@keyframes slideUp { from{transform:translateY(100%)} to{transform:translateY(0)} }
.install-banner-content {
  display:flex; align-items:center; gap:14px; margin-bottom:14px; color:var(--text-primary);
}
.install-banner-content svg { color:var(--accent-light); flex-shrink:0; }
.install-banner-content strong { display:block; font-size:15px; margin-bottom:2px; }
.install-banner-content span { font-size:13px; color:var(--text-secondary); }
.install-banner-actions { display:flex; gap:10px; justify-content:flex-end; }
.install-dismiss {
  padding:8px 20px; border-radius:var(--radius-xl); font-size:14px; font-weight:500;
  color:var(--text-secondary); transition:background var(--transition);
}
.install-dismiss:hover { background:var(--bg-hover); }
.install-btn { padding:8px 24px; font-size:14px; }

/* Mobile */
@media (max-width:768px) {
  .sidebar { max-width:100%; position:absolute; inset:0; z-index:2; }
  .sidebar.hidden { transform:translateX(-100%); }
  .back-btn { display:flex; }
  .chat-area { position:absolute; inset:0; }
}

::-webkit-scrollbar { width:6px; }
::-webkit-scrollbar-track { background:transparent; }
::-webkit-scrollbar-thumb { background:var(--bg-tertiary); border-radius:3px; }
.hidden { display:none !important; }