:root {
  --font-primary: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  
  /* Light Theme */
  --background-light: #F9F9F9;
  --text-light: #111827;
  --glass-bg-light: rgba(255, 255, 255, 0.7);
  --card-bg-light: #FFFFFF;
  --border-light: #E5E7EB;

  /* Dark Theme */
  --background-dark: #121212;
  --text-dark: #E5E7EB;
  --glass-bg-dark: rgba(20, 20, 20, 0.7);
  --card-bg-dark: #1E1E1E;
  --border-dark: #374151;

  /* Accent Color */
  --accent-primary: #00704A; /* Starbucks Green */
  --accent-primary-hover: #005c3d;

  /* Default to Dark Theme */
  --background-color: var(--background-dark);
  --text-color: var(--text-dark);
  --glass-bg: var(--glass-bg-dark);
  --card-bg: var(--card-bg-dark);
  --border-color: var(--border-dark);

  --header-height: 70px;
  --container-width: 1200px;
  --container-padding: 1.5rem;
  --transition-fast: 0.2s ease-in-out;
  --transition-medium: 0.4s ease-in-out;
}

/* Basic Reset & Globals */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

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

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

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

.cta-button {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: var(--accent-primary);
  color: #FFFFFF;
  text-decoration: none;
  border-radius: 5px;
  font-weight: 600;
  border: 2px solid transparent;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.cta-button:hover {
  background-color: var(--accent-primary-hover);
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1rem 0;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background-color var(--transition-medium);
}

.site-header.scrolled {
  background-color: var(--background-color);
  border-bottom: 1px solid var(--border-color);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: var(--header-height);
}

.logo a {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-color);
  text-decoration: none;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.main-nav a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding: 0.5rem 0;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-primary);
  transition: width var(--transition-fast);
}

.main-nav a:hover::after {
  width: 100%;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.menu-toggle .hamburger {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--text-color);
  position: relative;
  transition: transform var(--transition-medium);
}

.menu-toggle .hamburger::before,
.menu-toggle .hamburger::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 2px;
  background-color: var(--text-color);
  transition: transform var(--transition-medium), top var(--transition-medium);
}

.menu-toggle .hamburger::before {
  top: -8px;
}

.menu-toggle .hamburger::after {
  top: 8px;
}

/* Responsive Navigation */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    height: 100vh;
    background-color: var(--card-bg);
    padding-top: calc(var(--header-height) + 2rem);
    transition: right var(--transition-medium);
  }

  .main-nav.is-active {
    right: 0;
  }

  .main-nav ul {
    flex-direction: column;
    align-items: center;
    gap: 2.5rem;
  }

  .main-nav a {
    font-size: 1.2rem;
  }

  body.no-scroll {
    overflow: hidden;
  }

  /* Hamburger to X animation */
  .menu-toggle.is-active .hamburger {
      transform: rotate(45deg);
  }
  .menu-toggle.is-active .hamburger::before {
      top: 0;
      transform: rotate(90deg);
  }
  .menu-toggle.is-active .hamburger::after {
      top: 0;
      transform: rotate(90deg);
  }
}

/* Footer */
.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
  margin-top: 4rem;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-socials {
  display: flex;
  gap: 1rem;
}

.footer-socials a {
  color: var(--text-color);
  font-size: 1.5rem;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.footer-socials a:hover {
  color: var(--accent-primary);
  transform: scale(1.2);
}

/* Animations */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}