.auth-grid {
  pointer-events: none;
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(42, 246, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 246, 255, 0.06) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(circle at center, black 40%, transparent 100%);
  z-index: -1;
}

.auth-main {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  position: relative;
}

.auth-container {
  width: 100%;
  max-width: 420px;
  position: relative;
}

.auth-card {
  position: relative;
}

.auth-frame {
  padding: 2px;
  background: conic-gradient(
    from 0deg,
    transparent 0deg,
    color-mix(in srgb, var(--line) 55%, transparent) 40deg,
    transparent 90deg,
    color-mix(in srgb, var(--accent-magenta) 45%, transparent) 200deg,
    transparent 320deg
  );
  opacity: 0.6;
  animation: frameEdgeSpin 8s linear infinite;
  will-change: transform;
  border-radius: 16px;
}

.auth-frame::before {
  display: none;
}

.auth-content {
  background: linear-gradient(145deg, rgba(11, 20, 36, 0.98), rgba(7, 12, 22, 0.95));
  border: 1px solid rgba(42, 246, 255, 0.1);
  padding: 2.75rem 2.25rem;
  position: relative;
  backdrop-filter: blur(20px);
  border-radius: 14px;
  box-shadow: 
    0 25px 50px -12px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.form-group {
  position: relative;
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-family: "Orbitron", sans-serif;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.6rem;
  font-weight: 500;
}

.form-input {
  width: 100%;
  background: rgba(7, 13, 24, 0.9);
  border: 1px solid rgba(42, 246, 255, 0.15);
  color: var(--text);
  padding: 1rem 1.1rem;
  font-size: 1rem;
  border-radius: 8px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.form-input:hover {
  border-color: rgba(42, 246, 255, 0.25);
  background: rgba(7, 13, 24, 0.95);
}

.form-input:focus {
  outline: none;
  border-color: var(--line);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--line) 20%, transparent);
  background: rgba(7, 13, 24, 1);
}

.form-input::placeholder {
  color: rgba(149, 164, 201, 0.4);
}

.input-scan {
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.form-group:focus-within .input-scan {
  opacity: 1;
  animation: scanLine 1.5s ease-in-out infinite;
}

.form-input.success {
  border-color: var(--line);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--line) 20%, transparent);
}

.form-input.error {
  border-color: var(--hot);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--hot) 20%, transparent);
}

.form-label {
  display: block;
  font-family: "Orbitron", sans-serif;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.form-input {
  width: 100%;
  background: rgba(7, 13, 24, 0.86);
  border: 1px solid rgba(42, 246, 255, 0.2);
  color: var(--text);
  padding: 0.85rem 1rem;
  font-size: 0.95rem;
  border-radius: 6px;
  transition: all 0.25s ease;
  position: relative;
}

.form-input:focus {
  outline: none;
  border-color: var(--line);
  box-shadow: 0 0 20px rgba(42, 246, 255, 0.15);
}

.form-input.success {
  border-color: var(--line);
  box-shadow: 0 0 15px rgba(42, 246, 255, 0.2);
}

.form-input.error {
  border-color: var(--hot);
  box-shadow: 0 0 15px rgba(255, 58, 152, 0.2);
}

.form-input::placeholder {
  color: rgba(149, 164, 201, 0.5);
}

.input-scan {
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.form-group:focus-within .input-scan {
  opacity: 1;
  animation: scanLine 1.5s ease-in-out infinite;
}

@keyframes scanLine {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.password-wrapper {
  position: relative;
}

.password-toggle {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  padding: 0.25rem;
  transition: color 0.2s ease;
}

.password-toggle:hover {
  color: var(--line);
}

.eye-icon {
  width: 20px;
  height: 20px;
}

#usernameFeedback,
#emailFeedback,
#passwordStrength,
#confirmFeedback {
  font-family: "Rajdhani", sans-serif;
  font-size: 0.85rem;
  margin-top: 0.5rem;
  display: block;
  min-height: 1.2rem;
}

#usernameFeedback.success,
#emailFeedback.success,
#passwordStrength.success,
#confirmFeedback.success {
  color: var(--line);
}

#usernameFeedback.error,
#emailFeedback.error,
#passwordStrength.error,
#confirmFeedback.error {
  color: var(--hot);
}

#passwordCriteria {
  padding: 0.75rem 0.5rem;
  background: rgba(42, 246, 255, 0.02);
  border-radius: 8px;
  border: 1px solid rgba(42, 246, 255, 0.05);
  margin-top: 0.75rem;
}

#passwordCriteria.hidden {
  display: none;
}

.form-options {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.75rem;
  font-size: 0.85rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  color: var(--text);
  user-select: none;
  padding: 0.25rem 0;
}

.checkbox-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.checkbox-custom {
  width: 20px;
  height: 20px;
  border: 1.5px solid rgba(42, 246, 255, 0.25);
  border-radius: 4px;
  background: rgba(7, 13, 24, 0.8);
  transition: all 0.25s ease;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.checkbox-label:hover .checkbox-custom {
  border-color: rgba(42, 246, 255, 0.4);
}

.checkbox-input:checked + .checkbox-custom {
  background: var(--line);
  border-color: var(--line);
}

.checkbox-input:checked + .checkbox-custom::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 2px;
  width: 5px;
  height: 9px;
  border: solid #05070f;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.checkbox-input:focus-visible + .checkbox-custom {
  outline: 2px solid var(--line);
  outline-offset: 2px;
}

.auth-submit {
  position: relative;
  overflow: hidden;
}

.btn-text,
.btn-loader {
  transition: opacity 0.2s ease;
}

.btn-loader {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  opacity: 0;
}

.auth-submit.loading .btn-text {
  opacity: 0;
}

.auth-submit.loading .btn-loader {
  opacity: 1;
  animation: spin 0.8s linear infinite;
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.5rem 0;
}

.divider-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(42, 246, 255, 0.3), transparent);
}

.divider-text {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.social-login {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 0.5rem;
  border: 1px solid rgba(42, 246, 255, 0.15);
  border-radius: 6px;
  background: rgba(7, 13, 24, 0.6);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.social-btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(42, 246, 255, 0.1), transparent);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.social-btn:hover {
  border-color: rgba(42, 246, 255, 0.3);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(42, 246, 255, 0.1);
}

.social-btn:hover::before {
  opacity: 1;
}

.social-btn.google:hover {
  border-color: #EA4335;
  box-shadow: 0 4px 20px rgba(234, 67, 53, 0.2);
}

.social-btn.github:hover {
  border-color: #ffffff;
  box-shadow: 0 4px 20px rgba(255, 255, 255, 0.15);
}

.social-btn.facebook:hover {
  border-color: #1877F2;
  box-shadow: 0 4px 20px rgba(24, 119, 242, 0.2);
}

.social-btn.twitter:hover {
  border-color: #1DA1F2;
  box-shadow: 0 4px 20px rgba(29, 161, 242, 0.2);
}

.social-icon {
  width: 18px;
  height: 18px;
  z-index: 1;
}

@media (max-width: 480px) {
  .auth-main {
    padding: 1rem;
  }

  .auth-content {
    padding: 1.75rem 1.25rem;
  }

  .social-login {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .auth-frame {
    animation: none;
  }

  .input-scan {
    animation: none;
  }

  .btn-loader {
    animation: none;
  }
}