:root {
  /* Colors */
  --color-primary: #0D9488;
  --color-primary-light: #14B8A6;
  --color-primary-dark: #0F766E;
  --color-secondary: #F97316;
  --color-secondary-light: #FB923C;
  --color-secondary-dark: #EA580C;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-gray-50: #F9FAFB;
  --color-gray-100: #F3F4F6;
  --color-gray-200: #E5E7EB;
  --color-gray-300: #D1D5DB;
  --color-gray-400: #9CA3AF;
  --color-gray-500: #6B7280;
  --color-gray-600: #4B5563;
  --color-gray-700: #374151;
  --color-gray-800: #1F2937;
  --color-gray-900: #111827;
  
  /* Light Theme */
  --color-bg: #FFFFFF;
  --color-text: var(--color-gray-800);
  --color-text-light: var(--color-gray-600);
  --color-heading: var(--color-gray-900);
  --color-border: var(--color-gray-200);
  --color-shadow: rgba(0, 0, 0, 0.05);
  --color-card-bg: #FFFFFF;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-base-size: 16px;
  --font-line-height: 1.5;
  --font-heading-line-height: 1.2;
  
  /* Spacing */
  --spacing-1: 4px;
  --spacing-2: 8px;
  --spacing-3: 12px;
  --spacing-4: 16px;
  --spacing-5: 24px;
  --spacing-6: 32px;
  --spacing-8: 48px;
  --spacing-10: 64px;
  --spacing-12: 80px;
  --spacing-16: 128px;
  
  /* Border Radius */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 16px;
  --border-radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 var(--color-shadow);
  --shadow-md: 0 4px 6px -1px var(--color-shadow), 0 2px 4px -1px var(--color-shadow);
  --shadow-lg: 0 10px 15px -3px var(--color-shadow), 0 4px 6px -2px var(--color-shadow);
  
  /* Container Sizes */
  --container-max-width: 1280px;
  --container-padding: var(--spacing-4);
}

/* Dark Theme */
[data-theme="dark"] {
  --color-bg: var(--color-gray-900);
  --color-text: var(--color-gray-200);
  --color-text-light: var(--color-gray-400);
  --color-heading: var(--color-gray-50);
  --color-border: var(--color-gray-700);
  --color-shadow: rgba(0, 0, 0, 0.2);
  --color-card-bg: var(--color-gray-800);
}

/* Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: var(--font-base-size);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: var(--font-line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: color var(--transition-normal), background-color var(--transition-normal);
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: var(--spacing-4);
  font-weight: 700;
  line-height: var(--font-heading-line-height);
  color: var(--color-heading);
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-top: 0;
  margin-bottom: var(--spacing-4);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button, input, select, textarea {
  font: inherit;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* Logo */
.logo-link {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
}

.logo-link span {
  color: var(--color-secondary);
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  transition: background-color var(--transition-normal);
}

[data-theme="dark"] .site-header {
  background-color: rgba(17, 24, 39, 0.95);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.main-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
}

.main-nav a {
  color: var(--color-text);
  font-weight: 500;
  padding: var(--spacing-2);
  transition: color var(--transition-fast);
}

.main-nav a:hover {
  color: var(--color-primary);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--spacing-2);
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  margin: 5px 0;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.mobile-menu-open .mobile-menu-toggle span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 6px);
}

.mobile-menu-open .mobile-menu-toggle span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-open .mobile-menu-toggle span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -6px);
}

/* Theme Toggle */
.theme-toggle {
  background: transparent;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2);
  margin-right: var(--spacing-2);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

.theme-toggle .sun {
  display: none;
}

.theme-toggle .moon {
  display: block;
}

[data-theme="dark"] .theme-toggle .sun {
  display: block;
}

[data-theme="dark"] .theme-toggle .moon {
  display: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--border-radius-md);
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  border: 2px solid transparent;
}

.btn:hover {
  transform: translateY(-1px);
}

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

.btn-primary {
  background-color: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: white;
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: white;
}

.btn-sm {
  font-size: 0.875rem;
  padding: var(--spacing-1) var(--spacing-3);
}

.btn-md {
  font-size: 1rem;
  padding: var(--spacing-2) var(--spacing-4);
}

.btn-lg {
  font-size: 1.125rem;
  padding: var(--spacing-3) var(--spacing-5);
}

.btn-block {
  width: 100%;
}

/* Hero Section */
.hero {
  padding-top: 120px;
  padding-bottom: var(--spacing-10);
  background-color: rgba(13, 148, 136, 0.05);
  overflow: hidden;
}

[data-theme="dark"] .hero {
  background-color: rgba(13, 148, 136, 0.05);
}

.hero .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-8);
}

.hero-content {
  text-align: center;
  max-width: 800px;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-4);
  color: var(--color-heading);
}

.hero p {
  font-size: 1.25rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-6);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-3);
  margin-top: var(--spacing-5);
}

.hero-image {
  width: 100%;
  max-width: 600px;
  position: relative;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-slow);
}

.hero-image img:hover {
  transform: scale(1.03);
}

/* Features Section */
.features {
  padding-top: var(--spacing-10);
  padding-bottom: var(--spacing-10);
  background-color: rgba(249, 115, 22, 0.05);
  transition: background-color var(--transition-normal);
}

[data-theme="dark"] .features {
  background-color: var(--color-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: var(--spacing-5);
}

.feature-card {
  background-color: var(--color-card-bg);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-5);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  background-color: rgba(13, 148, 136, 0.1);
  border-radius: var(--border-radius-full);
  margin-bottom: var(--spacing-4);
  font-size: 2rem;
}

.feature-card h3 {
  margin-bottom: var(--spacing-3);
}

.feature-card p {
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* Benefits Section */
.benefits {
  padding: var(--spacing-12) 0;
  background-color: rgba(13, 148, 136, 0.05);
}

[data-theme="dark"] .benefits {
  background-color: rgba(249, 115, 22, 0.05);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: var(--spacing-5);
}

.benefit-card {
  background-color: var(--color-card-bg);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-5);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.benefit-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.benefit-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  background-color: rgba(249, 115, 22, 0.1);
  border-radius: var(--border-radius-full);
  margin-bottom: var(--spacing-4);
  font-size: 2rem;
}

.benefit-card h3 {
  margin-bottom: var(--spacing-3);
}

.benefit-card p {
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* Signup Section */
.signup {
  padding: var(--spacing-12) 0;
  background-color: rgba(249, 115, 22, 0.05);
}

[data-theme="dark"] .signup {
  background-color: rgba(13, 148, 136, 0.05);
}

.signup .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-8);
}

.signup-content {
  flex: 1;
  max-width: 600px;
  width: 100%;
}

.signup-image {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

@media (min-width: 768px) {
  .signup-image {
    margin-top: var(--spacing-12);
  }
}

.signup-image img {
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

/* Form Styles */
.signup-form {
  background-color: var(--color-card-bg);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-5);
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: var(--spacing-4);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-1);
  font-weight: 500;
}

.form-group label .required {
  font-size: 0.85em;
  font-weight: normal; /* Reset font-weight if inherited */
  color: red;
}

.form-group label .optional {
  font-size: 0.65em;
  font-weight: normal; /* Reset font-weight if inherited */
  color: var(--color-text-light);
  vertical-align: super;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-3);
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-group textarea {
  height: 120px;
  resize: vertical;
}

.error-message {
  color: var(--color-error);
  font-size: 0.875rem;
  margin-top: var(--spacing-1);
  height: 20px;
}

.form-disclaimer {
  margin-top: var(--spacing-4);
  font-size: 0.875rem;
  color: var(--color-text-light);
  text-align: center;
}

/* Footer */
.site-footer {
  background-color: var(--color-gray-900);
  color: var(--color-gray-300);
  padding: var(--spacing-8) 0 var(--spacing-4);
}

.footer-top {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
  margin-bottom: var(--spacing-8);
  border-bottom: 1px solid var(--color-gray-800);
  padding-bottom: var(--spacing-6);
}

.footer-logo {
  margin-bottom: var(--spacing-4);
}

.footer-logo p {
  margin-top: var(--spacing-2);
  margin-bottom: 0;
  color: var(--color-gray-400);
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

.footer-nav-column h4 {
  color: white;
  margin-bottom: var(--spacing-3);
}

.footer-nav-column ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-nav-column li {
  margin-bottom: var(--spacing-2);
}

.footer-nav-column a {
  color: var(--color-gray-400);
  transition: color var(--transition-fast);
}

.footer-nav-column a:hover {
  color: white;
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
  align-items: center;
  justify-content: center;
  text-align: center;
}

.footer-bottom p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-gray-500);
}

.social-links {
  display: flex;
  gap: var(--spacing-2);
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-gray-800);
  border-radius: var(--border-radius-full);
  color: var(--color-gray-300);
  transition: background-color var(--transition-fast), color var(--transition-fast);
  font-size: 1.25rem;
}

.social-links a:hover {
  background-color: var(--color-primary);
  color: white;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.modal.show {
  display: flex;
  opacity: 1;
}

.modal-content {
  background-color: var(--color-bg);
  padding: var(--spacing-6);
  border-radius: var(--border-radius-lg);
  max-width: 500px;
  width: 100%;
  position: relative;
  text-align: center;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.modal.show .modal-content {
  transform: translateY(0);
}

.close-modal {
  position: absolute;
  top: var(--spacing-4);
  right: var(--spacing-4);
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text-light);
}

.success-icon {
  color: var(--color-success);
  margin-bottom: var(--spacing-4);
  font-size: 3rem;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease forwards;
}

/* Media Queries */
@media (min-width: 640px) {
  .features-grid,
  .benefits-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  h1 {
    font-size: 3rem;
  }
  
  .hero h1 {
    font-size: 3rem;
  }
  
  .hero p {
    font-size: 1.25rem;
  }
  
  .hero .container {
    flex-direction: row;
  }
  
  .hero-content {
    text-align: left;
  }
  
  .hero-cta {
    justify-content: flex-start;
  }
  
  .signup .container {
    flex-direction: row;
  }
  
  .footer-top {
    flex-direction: row;
    justify-content: space-between;
  }
  
  .footer-logo {
    flex: 1;
  }
  
  .footer-nav {
    flex: 2;
    flex-direction: row;
    justify-content: space-between;
    gap: var(--spacing-4);
  }
  
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

@media (min-width: 1024px) {
  .features-grid,
  .benefits-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 767px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-4);
    box-shadow: var(--shadow-md);
  }
  
  .main-nav.show {
    display: block;
  }
  
  .main-nav ul {
    flex-direction: column;
    gap: var(--spacing-3);
  }
  
  .mobile-menu-toggle {
    display: block;
  }
}

/* Theme Toggle Icons */
.theme-toggle .sun {
  display: none; /* Hide sun by default (light mode) */
}
.theme-toggle .moon {
  display: block; /* Show moon by default (light mode) */
}

[data-theme="dark"] .theme-toggle .sun {
  display: block; /* Show sun in dark mode */
}
[data-theme="dark"] .theme-toggle .moon {
  display: none; /* Hide moon in dark mode */
}