:root {
  /* Default Light Theme */
  --bg-darker: #F8FAFC; /* Clean light background */
  --bg-dark: #FFFFFF;
  --bg-mid: #E2E8F0;
  
  --text-main: #0F172A; /* Dark slate text */
  --text-muted: #475569; /* Muted slate */
  
  --accent-sand: #D97706; /* Deeper sand for better contrast in light mode */
  --accent-sand-hover: #B45309;
  --accent-sand-glow: rgba(217, 119, 6, 0.2);
  
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(217, 119, 6, 0.2);
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.1);
  
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --theme-transition: background-color 0.5s ease, color 0.5s ease, border-color 0.5s ease, background-image 0.5s ease;
  --radius: 16px;
}

.dark-theme {
  /* Dark Theme Palette: Sea to Sands */
  --bg-darker: #040914; /* Deep ocean trench */
  --bg-dark: #0A1628; /* Deep dark blue */
  --bg-mid: #142847; /* Mid sea blue */
  
  --text-main: #F0F4F8; /* Very light blue/white */
  --text-muted: #A0B2C6; /* Muted sea text */
  
  --accent-sand: #E5B25D; /* Golden sand */
  --accent-sand-hover: #F2C97D; /* Lighter sand for hover */
  --accent-sand-glow: rgba(229, 178, 93, 0.4);
  
  --glass-bg: rgba(20, 40, 71, 0.4);
  --glass-border: rgba(229, 178, 93, 0.15);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-darker);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(20, 40, 71, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 85% 30%, rgba(229, 178, 93, 0.1) 0%, transparent 50%);
  background-attachment: fixed;
  transition: var(--theme-transition);
}

.dark-theme body {
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(20, 40, 71, 0.6) 0%, transparent 50%),
    radial-gradient(circle at 85% 30%, rgba(229, 178, 93, 0.15) 0%, transparent 50%);
}

/* Typography */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 1rem;
}

p {
  font-size: 1.125rem;
  color: var(--text-muted);
}

.text-gradient {
  background: linear-gradient(135deg, var(--text-main) 0%, var(--accent-sand) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
}

/* Reusable Components */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.75rem;
  border-radius: 50px;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-sand) 0%, #C9963D 100%);
  color: var(--bg-darker);
  box-shadow: 0 4px 20px var(--accent-sand-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--accent-sand-glow);
  background: linear-gradient(135deg, var(--accent-sand-hover) 0%, var(--accent-sand) 100%);
}

.btn-secondary {
  background: var(--glass-bg);
  color: var(--text-main);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--bg-mid);
  border-color: var(--accent-sand);
  transform: translateY(-2px);
}

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 2.5rem;
  transition: var(--transition);
}

.glass-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-sand);
  box-shadow: var(--shadow);
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding: 1.5rem 0;
  transition: var(--transition);
}

header.scrolled {
  padding: 1rem 0;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  transition: var(--theme-transition);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle {
  background: var(--bg-mid);
  color: var(--text-main);
  border: 1px solid var(--glass-border);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  font-size: 1.2rem;
}

.theme-toggle:hover {
  transform: scale(1.1);
  background: var(--accent-sand);
  color: var(--bg-darker);
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  text-decoration: none;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo span {
  color: var(--accent-sand);
}

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

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--accent-sand);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-content {
  z-index: 2;
}

.hero-subtitle {
  color: var(--accent-sand);
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 1rem;
  display: inline-block;
}

.hero p {
  margin: 1.5rem 0 2.5rem;
  font-size: 1.25rem;
  max-width: 500px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
}

.hero-image-wrapper {
  position: relative;
  z-index: 1;
}

.hero-image {
  width: 100%;
  border-radius: var(--radius);
  animation: float 6s ease-in-out infinite;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  border: 1px solid var(--glass-border);
}

/* Features Section */
.features {
  padding: 8rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 5rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  background: rgba(229, 178, 93, 0.1);
  color: var(--accent-sand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(229, 178, 93, 0.2);
}

.feature-title {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

/* Dashboard Preview Section */
.dashboard-preview {
  padding: 4rem 0 8rem;
}

.dashboard-container {
  position: relative;
  border-radius: var(--radius);
  padding: 1rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}

.dashboard-img {
  width: 100%;
  border-radius: 8px;
  display: block;
}

/* Call to Action */
.cta-section {
  padding: 6rem 0;
  text-align: center;
  background: linear-gradient(180deg, transparent 0%, var(--bg-mid) 100%);
}

.cta-content {
  max-width: 600px;
  margin: 0 auto;
}

.cta-content p {
  margin-bottom: 2rem;
}

/* Footer */
footer {
  padding: 4rem 0 2rem;
  background-color: var(--bg-darker);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.footer-col h4 {
  margin-bottom: 1.5rem;
  color: var(--text-main);
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 0.75rem;
}

.footer-col ul a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}

.footer-col ul a:hover {
  color: var(--accent-sand);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Animations */
@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
  100% { transform: translateY(0px); }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease-out;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }
  
  .hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  h1 {
    font-size: 3rem;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; /* Simple mobile nav hiding for demo */
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .hero {
    padding-top: 8rem;
  }
}

/* Contact Section */
.contact-section {
  padding: 80px 0;
  text-align: center;
}

.form-container {
  max-width: 800px;
  margin: 0 auto;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.form-container iframe {
  display: block;
}

@media (max-width: 768px) {
  .contact-section {
    padding: 60px 0;
  }
}