/* Base Theme Variables */
:root {
  /* Color System */
  --color-white: #FFFFFF;
  --color-dark: #1E1E1E;
  --color-dark-lighter: #2A2A2A;
  --color-dark-surface: #333333;
  --color-light-blue: #C3ECF6;
  --color-medium-blue: #57CAFF;
  --color-google-blue: #3285F5;
  --color-google-yellow: #F9AB00;
  --color-google-red: #EA4335;
  --color-google-green: #0F9D58;

  /* Typography */
  --font-primary: 'Roboto', 'Google Sans', sans-serif;
  --font-mono: 'Roboto Mono', monospace;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;

  /* Elevation & Effects */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.3);
  --shadow-glow-blue: 0 0 20px rgba(50, 133, 245, 0.15);
  --shadow-glow-yellow: 0 0 20px rgba(249, 171, 0, 0.15);
  
  /* Borders */
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;
  --border-radius-xl: 24px;
  
  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index */
  --z-index-modal: 1000;
  --z-index-overlay: 900;
  --z-index-dropdown: 800;
  --z-index-header: 700;
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-dark);
  color: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

/* Common Components */
.card {
  background: linear-gradient(135deg, var(--color-dark-surface) 0%, var(--color-dark) 100%);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  transition: var(--transition-base);
}

.card:hover {
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: var(--border-radius-md);
  font-weight: 500;
  font-family: var(--font-primary);
  font-size: 14px;
  transition: var(--transition-base);
  cursor: pointer;
  border: none;
  gap: var(--spacing-sm);
  text-decoration: none;
}

.button-primary {
  background: var(--color-google-blue);
  color: var(--color-white);
  box-shadow: var(--shadow-glow-blue);
}

.button-primary:hover {
  background: rgba(50, 133, 245, 0.9);
  transform: translateY(-2px);
}

.button-primary:active {
  transform: translateY(0);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.button-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* Navigation */
.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
  list-style: none;
}

.nav-links li {
  margin: 0;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: var(--border-radius-sm);
  transition: var(--transition-base);
}

.nav-links a:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
}

.nav-links a.active {
  color: var(--color-white);
  background: rgba(50, 133, 245, 0.2);
}

/* Form Elements */
.input-field {
  width: 100%;
  padding: var(--spacing-md);
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-md);
  color: var(--color-white);
  font-family: var(--font-primary);
  font-size: 14px;
  transition: var(--transition-base);
}

.input-field::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

.input-field:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.15);
}

.input-field:focus {
  outline: none;
  border-color: var(--color-google-blue);
  box-shadow: var(--shadow-glow-blue);
  background: rgba(255, 255, 255, 0.08);
}

/* Icons */
.material-icons,
.material-icons-round {
  font-size: 20px;
  vertical-align: middle;
}

/* Message Styles */
.message {
  padding: var(--spacing-md);
  border-radius: var(--border-radius-md);
  margin-top: var(--spacing-md);
  font-size: 14px;
  display: none;
}

.message.success {
  background: rgba(15, 157, 88, 0.1);
  border: 1px solid rgba(15, 157, 88, 0.3);
  color: #34A853;
}

.message.error {
  background: rgba(234, 67, 53, 0.1);
  border: 1px solid rgba(234, 67, 53, 0.3);
  color: #EA4335;
}

/* Footer */
.footer {
  background: var(--color-dark-surface);
  color: rgba(255, 255, 255, 0.7);
  text-align: center;
  padding: var(--spacing-xl);
  margin-top: var(--spacing-xxl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer p {
  margin: 0;
  font-size: 14px;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Utilities */
.text-gradient {
  background: linear-gradient(135deg, var(--color-google-blue), var(--color-medium-blue));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.glass-effect {
  background: rgba(30, 30, 30, 0.8);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-container {
    padding: 0 var(--spacing-md);
  }
  
  .nav-links {
    gap: var(--spacing-md);
  }
  
  .nav-links a {
    font-size: 13px;
    padding: 6px 10px;
  }
  
  .card {
    padding: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  .nav-container {
    padding: 0 var(--spacing-sm);
  }
  
  .nav-logo {
    font-size: 18px;
  }
  
  .nav-links {
    gap: var(--spacing-sm);
  }
  
  .button {
    padding: 10px 16px;
    font-size: 13px;
  }
}