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

body {
  font-family: 'Inter', sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #0f0f1a;
  overflow: hidden;
}
.bg-blob {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.4;
  z-index: 0;
  animation: blobFloat 14s ease-in-out infinite alternate;
}
.bg-blob.one   { width: 520px; height: 520px; background: #6c3bdb; top: -10%; left: -8%; }
.bg-blob.two   { width: 440px; height: 440px; background: #e94590; bottom: -12%; right: -6%; animation-delay: -5s; }
.bg-blob.three { width: 360px; height: 360px; background: #1dbfe0; top: 50%; left: 50%; transform: translate(-50%, -50%); animation-delay: -9s; }

@keyframes blobFloat {
  0%   { transform: translate(0, 0) scale(1); }
  50%  { transform: translate(30px, -40px) scale(1.08); }
  100% { transform: translate(-20px, 20px) scale(0.95); }
}
.container {
  position: relative;
  z-index: 1;
  width: 960px;
  min-height: 580px;
  display: flex;
  border-radius: 24px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow:
    0 30px 80px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
.panel {
  flex: 1;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 40px;
  transition: opacity 0.6s ease, filter 0.6s ease, transform 0.6s cubic-bezier(.4,0,.2,1);
}

.panel.login-panel  { z-index: 2; }
.panel.signup-panel  { z-index: 2; }
.gradient-overlay {
  position: absolute;
  top: 0;
  width: 50%;
  height: 100%;
  z-index: 5;
  pointer-events: none;
  transition: left 0.8s cubic-bezier(.77,0,.18,1),
              opacity 0.8s ease;
}

.gradient-overlay .grad-inner {
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(108, 59, 219, 0.92) 0%,
    rgba(233, 69, 144, 0.88) 50%,
    rgba(29, 191, 224, 0.85) 100%
  );
  background-size: 300% 300%;
  animation: gradientShift 6s ease infinite;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  text-align: center;
  color: #fff;
}

@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
.container.login-active .gradient-overlay {
  left: 50%;
}
.container.signup-active .gradient-overlay {
  left: 0;
}
.container.login-active .signup-panel {
  opacity: 0.15;
  filter: blur(2px);
  transform: scale(0.97);
}
.container.signup-active .login-panel {
  opacity: 0.15;
  filter: blur(2px);
  transform: scale(0.97);
}
.container.login-active .login-panel,
.container.signup-active .signup-panel {
  opacity: 1;
  filter: blur(0);
  transform: scale(1);
}
.overlay-content {
  position: relative;
  z-index: 2;
}
.overlay-content h2 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 12px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}
.overlay-content p {
  font-size: 14px;
  line-height: 1.6;
  opacity: 0.9;
  margin-bottom: 28px;
  max-width: 260px;
}
.overlay-content .switch-btn {
  padding: 12px 36px;
  border-radius: 50px;
  border: 2px solid rgba(255,255,255,0.7);
  background: transparent;
  color: #fff;
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  letter-spacing: 0.5px;
  pointer-events: all;
}
.overlay-content .switch-btn:hover {
  background: rgba(255,255,255,0.15);
  border-color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}
.sparkle {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(255,255,255,0.6);
  animation: sparkleFloat 4s ease-in-out infinite;
}
.sparkle:nth-child(1) { top: 15%; left: 20%; animation-delay: 0s; }
.sparkle:nth-child(2) { top: 70%; left: 75%; animation-delay: 1s; width: 3px; height: 3px; }
.sparkle:nth-child(3) { top: 40%; left: 50%; animation-delay: 2s; width: 5px; height: 5px; }
.sparkle:nth-child(4) { top: 85%; left: 30%; animation-delay: 3s; }
.sparkle:nth-child(5) { top: 25%; left: 80%; animation-delay: 1.5s; width: 3px; height: 3px; }

@keyframes sparkleFloat {
  0%, 100% { opacity: 0; transform: translateY(0) scale(1); }
  50%      { opacity: 1; transform: translateY(-20px) scale(1.5); }
}
.divider-line {
  position: absolute;
  left: 50%;
  top: 10%;
  height: 80%;
  width: 1px;
  background: linear-gradient(
    to bottom,
    transparent,
    rgba(255,255,255,0.08) 30%,
    rgba(255,255,255,0.08) 70%,
    transparent
  );
  z-index: 1;
}
.form-header {
  text-align: center;
  margin-bottom: 32px;
}
.form-header .icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 24px;
}
.login-panel .form-header .icon {
  background: linear-gradient(135deg, #6c3bdb 0%, #9b59b6 100%);
  box-shadow: 0 8px 25px rgba(108, 59, 219, 0.35);
}
.signup-panel .form-header .icon {
  background: linear-gradient(135deg, #e94590 0%, #ff6b6b 100%);
  box-shadow: 0 8px 25px rgba(233, 69, 144, 0.35);
}
.form-header h2 {
  font-size: 24px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}
.form-header p {
  font-size: 13px;
  color: rgba(255,255,255,0.45);
}

.form-group {
  width: 100%;
  max-width: 320px;
  margin-bottom: 18px;
  position: relative;
}
.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: rgba(255,255,255,0.5);
  margin-bottom: 6px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.form-group .input-wrapper {
  position: relative;
}
.form-group .input-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 16px;
  opacity: 0.4;
  pointer-events: none;
  transition: opacity 0.3s;
}
.form-group input {
  width: 100%;
  padding: 13px 16px 13px 42px;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  background: rgba(255,255,255,0.04);
  color: #fff;
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  outline: none;
  transition: all 0.3s ease;
}
.form-group input::placeholder {
  color: rgba(255,255,255,0.2);
}
.form-group input:focus {
  border-color: rgba(108, 59, 219, 0.6);
  background: rgba(255,255,255,0.06);
  box-shadow: 0 0 0 3px rgba(108, 59, 219, 0.15);
}
.form-group input:focus ~ .input-icon,
.form-group input:focus + .input-icon {
  opacity: 0.8;
}

.form-extras {
  width: 100%;
  max-width: 320px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  font-size: 12px;
}
.form-extras label {
  display: flex;
  align-items: center;
  gap: 6px;
  color: rgba(255,255,255,0.45);
  cursor: pointer;
}
.form-extras label input[type="checkbox"] {
  accent-color: #6c3bdb;
  width: 14px;
  height: 14px;
}
.form-extras a {
  color: #9b7cdb;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}
.form-extras a:hover {
  color: #c3a6ff;
}

.submit-btn {
  width: 100%;
  max-width: 320px;
  padding: 14px;
  border: none;
  border-radius: 12px;
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
  letter-spacing: 0.3px;
}
.login-panel .submit-btn {
  background: linear-gradient(135deg, #6c3bdb, #9b59b6);
  box-shadow: 0 8px 30px rgba(108, 59, 219, 0.4);
}
.signup-panel .submit-btn {
  background: linear-gradient(135deg, #e94590, #ff6b6b);
  box-shadow: 0 8px 30px rgba(233, 69, 144, 0.4);
}
.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(108, 59, 219, 0.5);
}
.submit-btn::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    transparent,
    rgba(255,255,255,0.08),
    transparent
  );
  transform: rotate(45deg);
  transition: left 0.6s ease;
}
.submit-btn:hover::after {
  left: 100%;
}

.social-login {
  margin-top: 24px;
  text-align: center;
  width: 100%;
  max-width: 320px;
}
.social-login .divider-text {
  font-size: 12px;
  color: rgba(255,255,255,0.25);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.social-login .divider-text::before,
.social-login .divider-text::after {
  content: '';
  flex: 1;
  height: 1px;
  background: rgba(255,255,255,0.08);
}
.social-icons {
  display: flex;
  gap: 12px;
  justify-content: center;
}
.social-icons button {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.03);
  color: rgba(255,255,255,0.5);
  font-size: 18px;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.social-icons button:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.15);
  color: #fff;
  transform: translateY(-2px);
}
.mobile-switch {
  display: none;
  margin-top: 20px;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
}
.mobile-switch a {
  color: #9b7cdb;
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
}
@media (max-width: 720px) {
  .container {
    flex-direction: column;
    width: 92%;
    min-height: auto;
    max-height: 95vh;
    overflow-y: auto;
  }
  .gradient-overlay { display: none !important; }
  .divider-line { display: none; }

  .panel {
    padding: 36px 24px;
    opacity: 1 !important;
    filter: none !important;
    transform: none !important;
  }

  .container.login-active .signup-panel {
    display: none;
  }
  .container.signup-active .login-panel {
    display: none;
  }

  .mobile-switch { display: block; }
}