/* 
  Nabigh App - Modern Educational Theme 
  Soft, clean, and professional design.
*/

:root {
  /* Color Palette */
  --primary: #4F46E5; /* Indigo 600 */
  --primary-hover: #4338CA; /* Indigo 700 */
  --secondary: #10B981; /* Emerald 500 */
  --accent: #F59E0B; /* Amber 500 */
  --background: #F9FAFB; /* Gray 50 */
  --surface: #FFFFFF;
  --text-main: #111827; /* Gray 900 */
  --text-muted: #6B7280; /* Gray 500 */
  --border: #E5E7EB; /* Gray 200 */
  
  /* Spacing */
  --container-width: 1200px;
  --header-height: 70px;
  
  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

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

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s;
}

ul {
  list-style: none;
}

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

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* Layout Utilities */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 4rem 0;
}

/* Header */
.site-header {
  background: var(--surface);
  height: var(--header-height);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-weight: 500;
  color: var(--text-muted);
}

.nav-links a:hover, .nav-links a.active {
  color: var(--primary);
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 6rem 0;
  background: linear-gradient(180deg, #FFFFFF 0%, #F3F4F6 100%);
}

.hero h1 {
  margin-bottom: 1.5rem;
  font-size: 3rem;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 1.25rem;
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: all 0.2s;
  cursor: pointer;
}

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

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.feature-card {
  background: var(--surface);
  padding: 2rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: transform 0.2s;
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: inline-block;
}

.feature-card h3 {
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

/* Footer */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
  color: var(--text-muted);
  margin-top: auto;
}

/* Page Content */
.page-content {
  min-height: calc(100vh - var(--header-height) - 80px); /* Approx footer height */
  display: flex;
  flex-direction: column;
}

.content-wrapper {
  background: var(--surface);
  padding: 3rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  max-width: 800px;
  margin: 0 auto;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.25rem;
  }
  
  .nav-links {
    gap: 1rem;
    font-size: 0.9rem;
  }
  
  .content-wrapper {
    padding: 1.5rem;
  }
}