:root {
  /* Colors */
  --primary-color: #0f172a;
  /* Deep Navy/Black */
  --secondary-color: #334155;
  /* Slate */
  --accent-color: #e2e8f0;
  /* Silver/Light Gray */
  --highlight-color: #38bdf8;
  /* Bright Blue for accents */
  --text-light: #f8fafc;
  --text-dark: #1e293b;
  --background-light: #ffffff;
  --background-dark: #0f172a;

  /* Spacing */
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--background-light);
}

/* Typography */
h1,
h2,
h3,
h4 {
  line-height: 1.2;
  font-weight: 700;
  color: var(--primary-color);
}

h1 {
  font-size: 3.5rem;
}

h2 {
  font-size: 2.5rem;
}

h3 {
  font-size: 1.75rem;
}

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}

/* Layout Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xl) 0;
}

/* Header & Nav */
header {
  background-color: var(--primary-color);
  color: var(--text-light);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

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

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 90px;
  /* Adjust based on preference */
  width: auto;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-links a {
  font-weight: 500;
  opacity: 0.9;
}

.nav-links a:hover {
  opacity: 1;
  color: var(--highlight-color);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  background: linear-gradient(rgba(15, 23, 42, 0.8), rgba(15, 23, 42, 0.8)), url('../images/hero-bg.jpg');
  /* Need to ensure this image exists or use a fallback color */
  background-size: cover;
  background-position: center;
  color: var(--text-light);
  height: 80vh;
  display: flex;
  align-items: center;
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  color: var(--text-light);
  margin-bottom: var(--spacing-lg);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-subtitle {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-lg);
  color: var(--accent-color);
}

.cta-button {
  display: inline-block;
  background-color: var(--highlight-color);
  color: var(--primary-color);
  padding: 1rem 2rem;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 1.1rem;
  box-shadow: var(--shadow-md);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  filter: brightness(110%);
}

/* Highlights Grid */
.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.highlight-card {
  padding: var(--spacing-lg);
  background: white;
  border-radius: 1rem;
  box-shadow: var(--shadow-md);
  text-align: center;
  border-top: 4px solid var(--highlight-color);
}

.highlight-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--primary-color);
}

/* Tournament Details Page */
.details-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
}

.info-block {
  background: #f8fafc;
  padding: var(--spacing-lg);
  border-radius: 1rem;
  margin-bottom: var(--spacing-md);
}

/* Form Styles */
.registration-form {
  max-width: 600px;
  margin: 0 auto;
  background: white;
  padding: var(--spacing-lg);
  border-radius: 1rem;
  box-shadow: var(--shadow-lg);
}

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

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #cbd5e1;
  border-radius: 0.5rem;
  font-family: inherit;
}

.form-group input:focus {
  outline: 2px solid var(--highlight-color);
  border-color: transparent;
}

/* Footer */
footer {
  background-color: var(--primary-color);
  color: var(--text-light);
  padding: var(--spacing-xl) 0;
  margin-top: auto;
}

.footer-content {
  text-align: center;
  opacity: 0.8;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--primary-color);
    flex-direction: column;
    padding: var(--spacing-md);
    text-align: center;
  }

  .nav-links.active {
    display: flex;
  }

  .mobile-menu-btn {
    display: block;
  }

  .details-grid {
    grid-template-columns: 1fr;
  }
}