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

:root {
  --color-primary: #007aff;
  --color-secondary: #5856d6;
  --color-danger: #ff3b30;
  --color-success: #34c759;

  --color-bg-light: rgba(255, 255, 255, 0.8);
  --color-bg-dark: rgba(0, 0, 0, 0.3);
  --color-text-primary: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-text-light: #ffffff;

  --blur-amount: 40px;
  --border-radius: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  color: var(--color-text-primary);
  overflow-x: hidden;
  min-height: 100vh;
}

/* Background Gradient */
.background-gradient {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 25%, #f093fb 50%, #4facfe 75%, #00f2fe 100%);
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
  z-index: -1;
}

@keyframes gradientShift {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

/* Glass Effect */
.glass {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.glass-container {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius);
  padding: 48px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

/* Screen Management */
.screen {
  display: none;
  min-height: 100vh;
  padding: 20px;
  align-items: center;
  justify-content: center;
}

.screen.active {
  display: flex;
}

/* Home Screen */
#homeScreen {
  flex-direction: column;
}

.logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.logo-icon {
  width: 64px;
  height: 64px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.logo h1 {
  font-size: 48px;
  font-weight: 700;
  color: white;
  text-align: center;
  letter-spacing: -1px;
}

.tagline {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.9);
  text-align: center;
  margin-bottom: 40px;
  font-weight: 500;
}

.button-group {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 100%;
  max-width: 400px;
  margin: 0 auto 48px;
}

.primary-button,
.secondary-button {
  padding: 18px 32px;
  border-radius: 14px;
  border: none;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.primary-button {
  background: white;
  color: var(--color-primary);
}

.primary-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.secondary-button {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.secondary-button:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.info-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.info-card {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 16px;
  padding: 24px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.info-icon {
  font-size: 32px;
  margin-bottom: 12px;
}

.info-card h3 {
  font-size: 16px;
  color: white;
  margin-bottom: 8px;
  font-weight: 600;
}

.info-card p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 400;
}

/* Chat Container */
.chat-container {
  width: 100%;
  max-width: 1200px;
  height: 90vh;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.chat-container.text-only {
  max-width: 800px;
}

/* Chat Header */
.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-radius: 16px;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 12px;
  color: white;
  font-weight: 500;
}

.status-dot {
  width: 10px;
  height: 10px;
  background: var(--color-success);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.header-actions {
  display: flex;
  gap: 12px;
}

.icon-button {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: none;
  background: rgba(255, 255, 255, 0.2);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.icon-button:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.05);
}

.icon-button.danger:hover {
  background: var(--color-danger);
}

.icon-button.muted {
  background: var(--color-danger);
}

/* Video Container */
.video-container {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  position: relative;
}

.video-wrapper {
  border-radius: 16px;
  overflow: hidden;
  position: relative;
  background: rgba(0, 0, 0, 0.3);
}

.video-wrapper video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-wrapper.local {
  position: absolute;
  bottom: 16px;
  right: 16px;
  width: 240px;
  height: 180px;
  z-index: 10;
}

.video-placeholder {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: white;
  gap: 20px;
}

.video-placeholder p {
  font-size: 18px;
  font-weight: 500;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Chat Controls */
.chat-controls {
  display: flex;
  justify-content: center;
  gap: 16px;
  padding: 16px;
  border-radius: 16px;
}

.control-button {
  padding: 14px 28px;
  border-radius: 12px;
  border: none;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--color-text-primary);
}

.control-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.control-button.secondary {
  background: rgba(255, 255, 255, 0.3);
  color: white;
}

.control-button.danger {
  background: var(--color-danger);
  color: white;
}

/* Text Chat Overlay (for video mode) */
.text-chat-overlay {
  position: absolute;
  bottom: 80px;
  left: 16px;
  width: 400px;
  height: 400px;
  border-radius: 16px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.text-chat-overlay.hidden {
  display: none;
}

.text-chat-overlay .messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.message-input-container {
  display: flex;
  gap: 8px;
}

.message-input-container input {
  flex: 1;
  padding: 10px 16px;
  border-radius: 10px;
  border: none;
  background: rgba(255, 255, 255, 0.3);
  color: white;
  font-size: 14px;
}

.message-input-container input::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.message-input-container button {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: none;
  background: white;
  color: var(--color-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.message-input-container button:hover {
  transform: scale(1.05);
}

/* Text Chat Container */
.text-chat-container {
  flex: 1;
  border-radius: 16px;
  padding: 24px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 8px;
}

.messages::-webkit-scrollbar {
  width: 6px;
}

.messages::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}

.messages::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.3);
  border-radius: 3px;
}

.message {
  padding: 12px 16px;
  border-radius: 12px;
  max-width: 70%;
  word-wrap: break-word;
  animation: messageSlide 0.3s ease;
}

@keyframes messageSlide {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message.sent {
  background: rgba(255, 255, 255, 0.9);
  color: var(--color-text-primary);
  align-self: flex-end;
  margin-left: auto;
}

.message.received {
  background: rgba(255, 255, 255, 0.25);
  color: white;
  align-self: flex-start;
}

.message.system {
  background: rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.8);
  align-self: center;
  font-size: 14px;
  font-style: italic;
  max-width: 100%;
  text-align: center;
}

/* Text Input Container */
.text-input-container {
  padding: 16px;
  border-radius: 16px;
  margin-top: 16px;
}

.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 8px 16px;
  margin-bottom: 8px;
}

.typing-indicator.hidden {
  display: none;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  background: rgba(255, 255, 255, 0.6);
  border-radius: 50%;
  animation: typing 1.4s ease-in-out infinite;
}

.typing-indicator span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typing {
  0%,
  60%,
  100% {
    transform: translateY(0);
    opacity: 0.6;
  }
  30% {
    transform: translateY(-10px);
    opacity: 1;
  }
}

.input-wrapper {
  display: flex;
  gap: 12px;
  align-items: center;
}

.input-wrapper input {
  flex: 1;
  padding: 14px 20px;
  border-radius: 12px;
  border: none;
  background: rgba(255, 255, 255, 0.3);
  color: white;
  font-size: 16px;
}

.input-wrapper input::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.input-wrapper input:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.4);
}

.send-button {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  border: none;
  background: white;
  color: var(--color-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.send-button:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Responsive Design */
@media (max-width: 768px) {
  .glass-container {
    padding: 32px 24px;
  }

  .logo h1 {
    font-size: 36px;
  }

  .button-group {
    max-width: 100%;
  }

  .info-cards {
    grid-template-columns: 1fr;
  }

  .video-wrapper.local {
    width: 120px;
    height: 90px;
    bottom: 8px;
    right: 8px;
  }

  .text-chat-overlay {
    width: calc(100% - 32px);
    height: 300px;
  }

  .chat-controls {
    flex-wrap: wrap;
  }

  .control-button {
    flex: 1;
    min-width: 120px;
  }
}

@media (max-width: 480px) {
  .screen {
    padding: 12px;
  }

  .chat-container {
    height: 100vh;
    gap: 12px;
  }

  .chat-header {
    padding: 12px 16px;
  }

  .status-indicator span {
    font-size: 14px;
  }
}