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

:root {
  --bg: #0a0a0a;
  --surface: #141414;
  --surface-2: #1a1a1a;
  --border: #252525;
  --text: #e5e5e5;
  --text-dim: #737373;
  --accent: #3b82f6;
  --green: #22c55e;
  --red: #ef4444;
}

html, body {
  height: 100%;
  height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overflow: hidden;
  overscroll-behavior: none;
}

.hidden {
  display: none !important;
}

/* App Container */
.app {
  height: 100%;
  height: 100dvh;
  max-width: 480px;
  margin: 0 auto;
}

/* Screens */
.screen {
  height: 100%;
  display: flex;
  flex-direction: column;
}

/* Welcome Screen */
.welcome {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 60px 24px 40px;
}

.welcome-header {
  text-align: center;
  margin-bottom: 60px;
}

.logo {
  width: 72px;
  height: 72px;
  background: linear-gradient(135deg, #1e1e1e 0%, #2a2a2a 100%);
  border: 1px solid var(--border);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  font-weight: 600;
  margin: 0 auto 16px;
  color: var(--text);
}

.welcome-header h1 {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.5px;
  margin-bottom: 4px;
}

.subtitle {
  color: var(--text-dim);
  font-size: 14px;
}

.welcome-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.btn-main {
  width: 100%;
  height: 56px;
  background: var(--text);
  color: var(--bg);
  border: none;
  border-radius: 14px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: transform 0.15s, opacity 0.15s;
}

.btn-main:active {
  transform: scale(0.98);
  opacity: 0.9;
}

.btn-main:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-main svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.divider {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--text-dim);
  font-size: 13px;
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.join-form {
  display: flex;
  gap: 12px;
}

.join-form input {
  flex: 1;
  height: 48px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0 16px;
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border-color 0.15s;
}

.join-form input:focus {
  border-color: var(--accent);
}

.join-form input::placeholder {
  color: var(--text-dim);
}

.btn-join {
  height: 48px;
  padding: 0 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-join:active {
  background: var(--surface-2);
}

.btn-join:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.privacy-switch {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: var(--surface);
  border-radius: 12px;
  cursor: pointer;
}

.privacy-switch input {
  display: none;
}

.switch-track {
  width: 44px;
  height: 26px;
  background: var(--border);
  border-radius: 13px;
  position: relative;
  transition: background 0.2s;
}

.switch-track::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  background: var(--text);
  border-radius: 50%;
  transition: transform 0.2s;
}

.privacy-switch input:checked + .switch-track {
  background: var(--accent);
}

.privacy-switch input:checked + .switch-track::after {
  transform: translateX(18px);
}

.switch-label {
  font-size: 14px;
  color: var(--text-dim);
}

.welcome-footer {
  display: flex;
  justify-content: center;
  gap: 20px;
  padding-top: 40px;
  font-size: 12px;
  color: var(--text-dim);
}

/* Waiting Screen */
.waiting {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
}

.loader {
  width: 40px;
  height: 40px;
  border: 2px solid var(--border);
  border-top-color: var(--text);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 24px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.waiting-text {
  font-size: 18px;
  font-weight: 500;
  margin-bottom: 24px;
}

.room-code {
  display: none;
}

.btn-copy {
  width: 36px;
  height: 36px;
  background: var(--surface-2);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.btn-copy svg {
  width: 18px;
  height: 18px;
  fill: var(--text-dim);
}

.btn-copy:active {
  background: var(--border);
}

.btn-copy-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  max-width: 300px;
  padding: 14px 24px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: white;
  border: none;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, background 0.15s;
  margin-bottom: 12px;
  -webkit-touch-callout: none;
}

.btn-copy-link svg {
  fill: white;
  flex-shrink: 0;
}

.btn-copy-link:active {
  opacity: 0.8;
}

.btn-copy-link.copied {
  background: var(--green);
}

.hint {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 32px;
}

.btn-text {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 14px;
  cursor: pointer;
  padding: 8px 16px;
}

.btn-text:hover {
  color: var(--text);
}

/* Chat Screen */
.chat {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-dot {
  width: 8px;
  height: 8px;
  background: var(--green);
  border-radius: 50%;
}

.status-dot.disconnected {
  background: var(--red);
}

.status-text {
  font-size: 13px;
  color: var(--text-dim);
}

.header-right {
  display: flex;
  gap: 8px;
}

.btn-icon {
  width: 40px;
  height: 40px;
  background: var(--surface);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.btn-icon svg {
  width: 20px;
  height: 20px;
  fill: var(--text-dim);
}

.btn-icon:active {
  background: var(--surface-2);
}

.btn-icon:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-icon.verified svg {
  fill: var(--green);
}

.btn-call svg {
  fill: var(--green);
}

.btn-call.calling {
  background: var(--red);
}

.btn-call.calling svg {
  fill: white;
}

/* Verify Panel */
.verify-panel {
  padding: 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.verify-hint {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.safety-code {
  display: block;
  padding: 16px;
  background: var(--bg);
  border-radius: 8px;
  font-family: 'SF Mono', Monaco, Consolas, monospace;
  font-size: 14px;
  letter-spacing: 2px;
  word-break: break-all;
  margin-bottom: 16px;
}

.fingerprint-hidden {
  display: none;
}

.verify-buttons {
  display: flex;
  gap: 12px;
}

.btn-verify-ok,
.btn-verify-no {
  flex: 1;
  height: 44px;
  border: none;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.15s;
}

.btn-verify-ok {
  background: var(--green);
  color: white;
}

.btn-verify-no {
  background: var(--red);
  color: white;
}

.btn-verify-ok:active,
.btn-verify-no:active {
  opacity: 0.8;
}

/* Messages */
.messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.message {
  max-width: 85%;
  padding: 12px 16px;
  border-radius: 18px;
  font-size: 15px;
  line-height: 1.4;
  animation: fadeIn 0.2s;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.message.sent {
  background: var(--accent);
  color: white;
  align-self: flex-end;
  border-bottom-right-radius: 6px;
}

.message.received {
  background: var(--surface-2);
  color: var(--text);
  align-self: flex-start;
  border-bottom-left-radius: 6px;
}

.message.system {
  background: transparent;
  color: var(--text-dim);
  font-size: 13px;
  text-align: center;
  align-self: center;
  max-width: 100%;
  padding: 8px 0;
}

.message-time {
  font-size: 11px;
  opacity: 0.6;
  margin-top: 4px;
}

/* Input Area */
.input-area {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.input-area textarea {
  flex: 1;
  min-height: 44px;
  max-height: 120px;
  padding: 12px 16px;
  background: var(--surface);
  border: none;
  border-radius: 22px;
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
  line-height: 1.4;
  resize: none;
  outline: none;
}

.input-area textarea::placeholder {
  color: var(--text-dim);
}

.btn-send {
  width: 44px;
  height: 44px;
  background: var(--accent);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s, background 0.15s;
  flex-shrink: 0;
}

.btn-send svg {
  width: 20px;
  height: 20px;
  fill: white;
  margin-left: 2px;
}

.btn-send:active {
  transform: scale(0.92);
}

/* Overlays */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fadeIn 0.2s;
}

/* Call Screen */
.call-screen {
  text-align: center;
  padding: 40px;
}

.call-info {
  margin-bottom: 60px;
}

.call-badge {
  display: inline-block;
  padding: 8px 16px;
  background: rgba(34, 197, 94, 0.15);
  border: 1px solid rgba(34, 197, 94, 0.3);
  border-radius: 20px;
  font-size: 13px;
  color: var(--green);
  margin-bottom: 24px;
}

.call-timer {
  font-size: 48px;
  font-weight: 300;
  font-family: 'SF Mono', Monaco, Consolas, monospace;
  letter-spacing: 4px;
}

.call-controls {
  display: flex;
  justify-content: center;
  gap: 32px;
}

.call-control-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.btn-label {
  font-size: 12px;
  color: var(--text-dim);
}

.btn-label-end {
  color: var(--red);
}

.btn-round {
  width: 64px;
  height: 64px;
  border: none;
  border-radius: 50%;
  background: var(--surface-2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s, background 0.15s;
}

.btn-round svg {
  width: 28px;
  height: 28px;
  fill: var(--text);
}

.btn-round:active {
  transform: scale(0.92);
}

.btn-round.muted {
  background: var(--red);
}

.btn-round.muted svg {
  fill: white;
}

.btn-end {
  background: var(--red);
}

.btn-end svg {
  fill: white;
}

.mute-icon.hidden {
  display: none;
}

.speaker-icon.hidden {
  display: none;
}

.btn-round.speaker-on {
  background: var(--accent);
}

.btn-round.speaker-on svg {
  fill: white;
}

/* Incoming Call */
.incoming-screen {
  text-align: center;
  padding: 40px;
}

.incoming-pulse {
  width: 100px;
  height: 100px;
  background: var(--green);
  border-radius: 50%;
  margin: 0 auto 32px;
  animation: pulse 1.5s ease-out infinite;
  display: flex;
  align-items: center;
  justify-content: center;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.5); }
  70% { box-shadow: 0 0 0 30px rgba(34, 197, 94, 0); }
  100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
}

.incoming-text {
  font-size: 20px;
  font-weight: 500;
  margin-bottom: 48px;
}

.incoming-controls {
  display: flex;
  justify-content: center;
  gap: 48px;
}

.btn-decline {
  background: var(--red);
}

.btn-decline svg {
  fill: white;
}

.btn-accept {
  background: var(--green);
}

.btn-accept svg {
  fill: white;
}

/* Alerts */
.alerts {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: calc(100% - 32px);
  max-width: 400px;
}

.security-alert {
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  animation: slideDown 0.3s, fadeOut 0.3s 4.7s forwards;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeOut {
  to { opacity: 0; }
}

.security-alert.severity-high {
  border-color: var(--red);
}

.security-alert.severity-medium {
  border-color: #f59e0b;
}

.security-alert-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.security-alert-icon {
  font-size: 16px;
}

.security-alert-title {
  font-size: 14px;
  font-weight: 500;
}

.security-alert-message {
  font-size: 13px;
  color: var(--text-dim);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

/* Mobile Adjustments */
@media (max-width: 480px) {
  .welcome {
    padding: 40px 20px 24px;
  }

  .welcome-header {
    margin-bottom: 40px;
  }

  .logo {
    width: 64px;
    height: 64px;
    font-size: 28px;
  }

  .welcome-header h1 {
    font-size: 24px;
  }

  .welcome-footer {
    flex-wrap: wrap;
    gap: 12px;
    padding-top: 24px;
  }

  .call-timer {
    font-size: 36px;
  }

  .btn-round {
    width: 56px;
    height: 56px;
  }

  .btn-round svg {
    width: 24px;
    height: 24px;
  }

  .chat-header {
    padding: 10px 12px;
  }

  .messages {
    padding: 12px;
  }

  .input-area {
    padding: 8px 12px;
  }
}

/* Виртуальная клавиатура на мобильных */
@media (max-height: 500px) {
  .welcome-header {
    margin-bottom: 20px;
  }

  .welcome-header .logo {
    display: none;
  }

  .welcome-footer {
    display: none;
  }
}

/* Safe area for notch devices */
@supports (padding-top: env(safe-area-inset-top)) {
  .chat-header {
    padding-top: calc(12px + env(safe-area-inset-top));
  }

  .input-area {
    padding-bottom: calc(12px + env(safe-area-inset-bottom));
  }
}

/* Selection */
::selection {
  background: var(--accent);
  color: white;
}

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:focus:not(:focus-visible),
input:focus:not(:focus-visible),
textarea:focus:not(:focus-visible) {
  outline: none;
}

/* Toast notification */
.toast-notification {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 14px;
  z-index: 10000;
  opacity: 1;
  transition: opacity 0.3s;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* PWA Install Banner */
.install-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  padding-bottom: calc(16px + env(safe-area-inset-bottom, 0px));
  background: var(--surface);
  border-top: 1px solid var(--border);
  z-index: 9999;
  transform: translateY(100%);
  transition: transform 0.3s ease-out;
}

.install-banner.visible {
  transform: translateY(0);
}

.install-banner-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.install-banner-content strong {
  font-size: 15px;
  color: var(--text);
}

.install-banner-content span {
  font-size: 13px;
  color: var(--text-dim);
}

.install-banner-action {
  padding: 8px 20px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}

.install-banner-action:active {
  opacity: 0.8;
}

.install-banner-close {
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}