/* ==========================================================================
   Langit Publishing - Open Access Journal Publisher
   ========================================================================== */

:root {
  /* Color Palette - Professional Navy, White, Grey with Gold/Teal Accents */
  --color-primary: #0f172a; /* Deep Navy Blue */
  --color-primary-light: #1e293b;
  --color-secondary: #0ea5e9; /* Light Blue / Teal Accent */
  --color-accent: #eab308; /* Gold Accent */
  --color-text-main: #334155;
  --color-text-light: #64748b;
  --color-bg-main: #ffffff;
  --color-bg-light: #f8fafc;
  --color-bg-dark: #0f172a;
  
  /* Typography */
  --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  
  /* Shadows & Radius */
  --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);
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  
  /* Transitions */
  --transition-fast: 0.2s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
}

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

body {
  font-family: var(--font-family-sans);
  color: var(--color-text-main);
  background-color: var(--color-bg-main);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

h1, h2, h3, h4, h5, h6 {
  color: var(--color-primary);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Utility Classes */
.text-center { text-align: center; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mt-4 { margin-top: 2rem; }
.py-4 { padding-top: 4rem; padding-bottom: 4rem; }
.bg-light { background-color: var(--color-bg-light); }
.bg-dark { background-color: var(--color-bg-dark); color: white; }
.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  gap: 0.5rem;
}

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

.btn-primary:hover {
  background-color: var(--color-secondary);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-accent:hover {
  background-color: #d97706; /* Darker Gold */
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

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

/* Navigation */
.navbar {
  background-color: white;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.navbar-brand:hover {
  color: var(--color-secondary);
}

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

.nav-link {
  color: var(--color-text-main);
  font-weight: 500;
  padding: 0.5rem 0;
  position: relative;
}

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

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

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.nav-link.active {
  color: var(--color-primary);
}

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

/* Hero Section */
.hero {
  background-color: var(--color-bg-light);
  padding: 6rem 0;
  position: relative;
  overflow: hidden;
}

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

.hero-content h1 {
  font-size: 3rem;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
}

.hero-content p {
  font-size: 1.125rem;
  color: var(--color-text-light);
  margin-bottom: 2rem;
  max-width: 90%;
}

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

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

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

.card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  border: 1px solid #e2e8f0;
  display: flex;
  flex-direction: column;
}

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

.card-icon {
  font-size: 3rem;
  color: var(--color-secondary);
  margin-bottom: 1.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  background-color: #e0f2fe; /* Light blue background for icon */
  border-radius: 50%;
}

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

.card-body {
  color: var(--color-text-light);
  flex-grow: 1;
}

/* Footer */
.footer {
  background-color: var(--color-primary);
  color: white;
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h3 {
  color: white;
  font-size: 1.25rem;
  margin-bottom: 1.5rem;
}

.footer-col p {
  color: #cbd5e1;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
}

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

.footer-links a {
  color: #cbd5e1;
}

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

.footer-social {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

.footer-social a {
  color: white;
  font-size: 1.5rem;
  transition: color var(--transition-fast);
}

.footer-social a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #94a3b8;
  font-size: 0.875rem;
}

/* Sections */
.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

.section-title p {
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* Table */
.table-responsive {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 2rem;
}

th, td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid #e2e8f0;
}

th {
  background-color: var(--color-bg-light);
  font-weight: 600;
  color: var(--color-primary);
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

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

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

/* Responsive */
@media (max-width: 768px) {
  .navbar-nav {
    display: none; /* simple mobile menu fallback */
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-content h1 {
    font-size: 2.5rem;
  }
  
  .hero-content p {
    max-width: 100%;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .section-title h2 {
    font-size: 1.75rem;
  }
}