.auth-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  padding: 20px;
}

.auth-container {
  background: var(--card-bg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 420px;
  width: 100%;
  overflow: hidden;
  animation: slideUp 0.4s ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.auth-header {
  background: var(--primary-gradient);
  color: white;
  padding: 32px 24px;
  text-align: center;
}

.auth-header h1 {
  font-size: 28px;
  margin-bottom: 8px;
  font-weight: 700;
}

.auth-header p {
  font-size: 14px;
  opacity: 0.9;
}

.auth-tabs {
  display: flex;
  background: var(--light-bg);
  border-bottom: 1px solid var(--border-color);
}

.auth-tab {
  flex: 1;
  padding: 16px;
  background: none;
  border: none;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  border-bottom: 3px solid transparent;
  pointer-events: auto;
  opacity: 1;
}

.auth-tab:hover {
  color: var(--text-primary);
  background: var(--light-bg);
}

.auth-tab.active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
  background: var(--card-bg);
}

.auth-tab.active:hover {
  background: var(--card-bg);
}

.auth-form {
  padding: 32px 24px;
}

.auth-form h2 {
  font-size: 24px;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  font-size: 16px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius);
  transition: all var(--transition);
  background: var(--card-bg);
  color: var(--text-primary);
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.auth-btn {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  color: white;
  background: var(--primary-gradient);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  margin-top: 8px;
  box-shadow: var(--shadow-sm);
}

.auth-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.auth-btn:active {
  transform: translateY(0);
}

.auth-link {
  text-align: center;
  margin-top: 16px;
  font-size: 14px;
  color: var(--text-secondary);
}

.auth-link a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
}

.auth-link a:hover {
  text-decoration: underline;
}

.hidden {
  display: none !important;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--light-bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
  touch-action: manipulation;
  overscroll-behavior-y: contain;
  -webkit-overflow-scrolling: touch;
}