/* ===== CSS Variables for Theme Support ===== */
:root {
  /* Colors - Dark Purple Theme */
  --primary: #7478E5;
  --primary-light: #8B8FEC;
  --primary-dark: #5B5FDE;
  --primary-alpha: rgba(116, 120, 229, 0.15);
  
  --success: #10B981;
  --danger: #EF4444;
  
  --bg-primary: rgba(15, 23, 42, 0.65);
  --bg-secondary: rgba(30, 41, 59, 0.55);
  --bg-tertiary: rgba(51, 65, 85, 0.45);
  
  --text-primary: #F1F5F9;
  --text-secondary: #CBD5E1;
  --text-tertiary: #94A3B8;
  
  --border: rgba(148, 163, 184, 0.2);
  --border-light: rgba(148, 163, 184, 0.1);
  
  /* Shadows */
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1.25rem;
}

/* Dark Theme */
[data-theme="dark"] {
  --primary: #7478E5;
  --primary-light: #8B8FEC;
  --primary-dark: #5B5FDE;
  --primary-alpha: rgba(116, 120, 229, 0.15);
  
  --bg-primary: rgba(15, 23, 42, 0.4);
  --bg-secondary: rgba(30, 41, 59, 0.3);
  --bg-tertiary: rgba(51, 65, 85, 0.2);
  
  --text-primary: #F1F5F9;
  --text-secondary: #CBD5E1;
  --text-tertiary: #94A3B8;
  
  --border: rgba(255, 255, 255, 0.15);
  --border-light: rgba(255, 255, 255, 0.08);
}

/* ===== Base Styles ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none;  /* IE and Edge */
}

html::-webkit-scrollbar {
  display: none;
  width: 0;
  height: 0;
}

/* Animated Gradient Background - Darker Purple Theme */
body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  max-height: 100vh;
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, #0F172A 0%, #1E293B 25%, #334155 50%, #1E293B 75%, #0F172A 100%);
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
  padding: 20px;
  position: relative;
  overflow-y: auto;
  overflow-x: hidden;
  /* Hide scrollbar for Chrome, Safari and Opera */
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none;  /* IE and Edge */
}

body::-webkit-scrollbar {
  display: none;
  width: 0 !important;
  height: 0 !important;
}

body::-webkit-scrollbar-track {
  display: none;
}

body::-webkit-scrollbar-thumb {
  display: none;
}

/* Floating Orbs Background - Purple Theme */
body::before,
body::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.4;
  animation: float 20s ease-in-out infinite;
}

body::before {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(116, 120, 229, 0.6) 0%, rgba(91, 95, 222, 0.3) 100%);
  top: -150px;
  left: -150px;
  animation-delay: -5s;
}

body::after {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(139, 143, 236, 0.6) 0%, rgba(116, 120, 229, 0.3) 100%);
  bottom: -150px;
  right: -150px;
  animation-delay: -10s;
}

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

@keyframes float {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  33% {
    transform: translate(50px, -50px) scale(1.1);
  }
  66% {
    transform: translate(-30px, 30px) scale(0.9);
  }
}

/* Glass Login Box - Darker Theme */
#auth-box {
  background: rgba(15, 23, 42, 0.5);
  -webkit-backdrop-filter: blur(25px) saturate(180%);
  backdrop-filter: blur(25px) saturate(180%);
  padding: 3rem 2.5rem;
  border-radius: var(--radius-xl);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37), 
              0 0 0 1px rgba(148, 163, 184, 0.1);
  width: 100%;
  max-width: 420px;
  text-align: center;
  opacity: 0;
  transform: translateY(20px);
  animation: slideUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  border: 1px solid rgba(148, 163, 184, 0.15);
  position: relative;
  overflow: visible;
  z-index: 10;
}

/* Shimmer Effect - Subtle */
#auth-box::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    45deg,
    transparent 30%,
    rgba(116, 120, 229, 0.08) 50%,
    transparent 70%
  );
  animation: shimmer 8s ease-in-out infinite;
}

@keyframes shimmer {
  0%, 100% {
    transform: translateX(-100%) translateY(-100%) rotate(45deg);
  }
  50% {
    transform: translateX(100%) translateY(100%) rotate(45deg);
  }
}

/* Title */
#auth-box h2 {
  margin-bottom: 0.5rem;
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: relative;
  z-index: 1;
}

.subtitle {
  margin-top: 0;
  margin-bottom: 2rem;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.5;
  position: relative;
  z-index: 1;
}

/* Form Styles */
form {
  margin-bottom: 1.5rem;
  position: relative;
  z-index: 1;
}

/* Glass Inputs - Darker Theme */
#auth-box input {
  width: 100%;
  padding: 0.875rem 1rem;
  margin-bottom: 1rem;
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: var(--radius-lg);
  font-size: 0.9375rem;
  font-family: inherit;
  color: var(--text-primary);
  background: rgba(30, 41, 59, 0.4);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: all var(--transition-base);
}

#auth-box input::placeholder {
  color: var(--text-tertiary);
}

#auth-box input:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(116, 120, 229, 0.15), 
              0 4px 12px rgba(0, 0, 0, 0.2);
  transform: translateY(-2px);
  background: rgba(30, 41, 59, 0.6);
}

#auth-box input:hover:not(:focus) {
  border-color: rgba(148, 163, 184, 0.3);
  background: rgba(30, 41, 59, 0.5);
}

/* Glass Buttons */
#auth-box button {
  width: 100%;
  padding: 0.875rem 1.25rem;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

#auth-box button::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
  z-index: -1;
}

#auth-box button:hover::before {
  width: 400px;
  height: 400px;
}

#btn-login,
#btn-register {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  margin-bottom: 0.75rem;
  box-shadow: 0 4px 15px rgba(91, 95, 222, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

#btn-login:hover,
#btn-register:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(91, 95, 222, 0.4);
}

#btn-login:active,
#btn-register:active {
  transform: translateY(-1px);
}

/* Glass Divider */
hr {
  margin: 1.5rem 0;
  border: none;
  border-top: 1px solid var(--border);
  opacity: 0.5;
  position: relative;
  z-index: 1;
}

/* Glass Google Button - Darker Theme */
#btn-google {
  width: 100%;
  background: rgba(30, 41, 59, 0.4);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: var(--text-primary);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: var(--radius-lg);
  padding: 0.875rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

#btn-google:hover {
  background: rgba(30, 41, 59, 0.6);
  border-color: rgba(148, 163, 184, 0.35);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
}

#btn-google:active {
  transform: translateY(-1px);
}

.google-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

/* Status Message */
#auth-status {
  display: block;
  margin-top: 1.25rem;
  font-size: 0.875rem;
  min-height: 24px;
  transition: all var(--transition-base);
  position: relative;
  z-index: 1;
}

/* Text Links */
#auth-box a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-fast);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  position: relative;
  z-index: 1;
}

#auth-box a:hover {
  color: var(--text-primary);
  text-decoration: underline;
  text-shadow: 0 2px 12px rgba(255, 255, 255, 0.3);
}

/* Helper Text */
#auth-box p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
  position: relative;
  z-index: 1;
}

/* Register Modal - Scrollable */
#register-modal {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(148, 163, 184, 0.15);
  animation: fadeIn 0.3s ease;
  position: relative;
  z-index: 1;
  max-height: 400px;
  overflow-y: auto;
  padding-right: 8px;
}

/* Scrollbar styling for register modal */
#register-modal::-webkit-scrollbar {
  width: 6px;
}

#register-modal::-webkit-scrollbar-track {
  background: rgba(30, 41, 59, 0.3);
  border-radius: 3px;
}

#register-modal::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 3px;
  opacity: 0.7;
}

#register-modal::-webkit-scrollbar-thumb:hover {
  background: var(--primary-light);
  opacity: 1;
}

#register-modal h3 {
  margin: 0 0 1.25rem 0;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Loading Spinner */
#loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  margin-top: 1.25rem;
  position: relative;
  z-index: 1;
}

.loading-spinner {
  width: 24px;
  height: 24px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: var(--text-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Glass Error and Success Messages - Darker Theme */
.auth-error {
  background: rgba(239, 68, 68, 0.15);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: #FCA5A5;
  padding: 0.875rem 1rem;
  border-radius: var(--radius-lg);
  margin: 1rem 0;
  font-size: 0.875rem;
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-left: 4px solid var(--danger);
  animation: slideIn 0.3s ease;
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.15);
}

.auth-success {
  background: rgba(16, 185, 129, 0.15);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: #6EE7B7;
  padding: 0.875rem 1rem;
  border-radius: var(--radius-lg);
  margin: 1rem 0;
  font-size: 0.875rem;
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-left: 4px solid var(--success);
  animation: slideIn 0.3s ease;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.15);
}

/* Disabled State */
#btn-google:disabled,
#btn-login:disabled,
#btn-register:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* Input Validation */
form input:invalid:not(:placeholder-shown) {
  border-color: rgba(239, 68, 68, 0.6);
  background: rgba(239, 68, 68, 0.05);
}

form input:valid:not(:placeholder-shown) {
  border-color: rgba(16, 185, 129, 0.6);
  background: rgba(16, 185, 129, 0.05);
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* ===== Responsive Design ===== */
@media (max-width: 480px) {
  #auth-box {
    padding: 2rem 1.5rem;
  }

  #auth-box h2 {
    font-size: 1.5rem;
  }

  .subtitle {
    font-size: 0.875rem;
  }

  #auth-box input,
  #auth-box button {
    font-size: 0.875rem;
    padding: 0.75rem 1rem;
  }
}

/* ===== Theme Toggle ===== */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.15);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  z-index: 100;
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: scale(1.05) rotate(15deg);
}

/* Form Options (Remember Me + Forgot Password) */
.form-options {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0 0 1rem 0;
  gap: 1rem;
}

/* Remember Me Toggle Switch */
.remember-me {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
}

.remember-me input[type="checkbox"] {
  display: none;
}

.remember-me label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--text-secondary);
  user-select: none;
  -webkit-user-select: none;
  position: relative;
  transition: color var(--transition-fast);
}

.remember-me label::before {
  content: '';
  width: 2rem;
  height: 1rem;
  background: rgba(148, 163, 184, 0.3);
  border-radius: 0.5rem;
  position: relative;
  transition: background 0.3s ease;
  flex-shrink: 0;
}

.remember-me label::after {
  content: '';
  width: 0.75rem;
  height: 0.75rem;
  background: white;
  border-radius: 50%;
  position: absolute;
  left: 0.125rem;
  transition: transform 0.3s ease;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.remember-me input[type="checkbox"]:checked + label::before {
  background: var(--primary);
}

.remember-me input[type="checkbox"]:checked + label::after {
  transform: translateX(1rem);
}

.remember-me label:hover {
  color: var(--text-primary);
}

/* Forgot Password Link */
.forgot-password {
  font-size: 0.875rem;
  color: var(--primary-light);
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
  position: relative;
  z-index: 1;
}

.forgot-password:hover {
  color: var(--primary);
  text-decoration: underline;
}

/* Signup Link */
.signup-link {
  margin: 1.25rem 0;
  font-size: 0.875rem;
  text-align: center;
  color: var(--text-secondary);
  position: relative;
  z-index: 1;
}

/* Privacy Footer */
.privacy-footer {
  text-align: center;
  margin-top: 2rem;
  font-size: 0.875rem;
  position: relative;
  z-index: 1;
}

.privacy-footer a {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.privacy-footer a:hover {
  color: var(--text-secondary);
  text-decoration: underline;
}

/* Password Strength Indicator */
.password-strength {
  width: 100%;
  height: 4px;
  background: rgba(148, 163, 184, 0.2);
  border-radius: 2px;
  overflow: hidden;
  margin: -0.5rem 0 0.5rem 0;
}

.strength-bar {
  height: 100%;
  width: 0%;
  background: var(--primary);
  transition: width 0.3s ease, background-color 0.3s ease;
  border-radius: 2px;
}

.password-hint {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin: -0.25rem 0 1rem 0;
  transition: color 0.3s ease;
}

/* Loading State */
#loading {
  display: none;
  text-align: center;
  margin-top: 1rem;
}

#loading p {
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus Visible (for keyboard navigation) */
*:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.8);
  outline-offset: 2px;
}