/* GCMN Library - Main Stylesheet */
/* Inspired by Library of Congress with Pakistan Green Theme */

:root {
  /* Pakistan Green Theme Colors */
  --primary-green: #01411C;
  --primary-green-light: #0A6638;
  --primary-green-dark: #003D19;
  --accent-gold: #C5A572;
  --accent-gold-light: #D4B88A;
  
  /* Neutral Colors */
  --white: #FFFFFF;
  --off-white: #F8F9FA;
  --light-gray: #E9ECEF;
  --medium-gray: #6C757D;
  --dark-gray: #343A40;
  --text-primary: #212529;
  --text-secondary: #6C757D;
  
  /* Semantic Colors */
  --success: #28A745;
  --warning: #FFC107;
  --danger: #DC3545;
  --info: #17A2B8;
  
  /* Typography - Library of Congress inspired */
  --font-serif: 'Libre Baskerville', 'Georgia', serif;
  --font-sans: 'Source Sans Pro', 'Segoe UI', system-ui, sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--primary-green-dark);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--spacing-md);
}

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

a:hover {
  color: var(--primary-green-light);
  text-decoration: underline;
}

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

/* Header & Navigation */
.header {
  background-color: var(--white);
  border-bottom: 3px solid var(--primary-green);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-top {
  background-color: var(--primary-green-dark);
  color: var(--white);
  padding: var(--spacing-sm) 0;
  font-size: 0.875rem;
}

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

.header-main {
  padding: var(--spacing-md) 0;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-lg);
}

.logo-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.logo {
  height: 60px;
  width: auto;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--primary-green-dark);
  margin: 0;
}

.site-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-menu a {
  color: var(--text-primary);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.nav-menu a:hover,
.nav-menu a.active {
  background-color: var(--primary-green);
  color: var(--white);
  text-decoration: none;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary-green-dark) 0%, var(--primary-green) 100%);
  color: var(--white);
  padding: var(--spacing-2xl) 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url('../assets/logo.png');
  background-size: 400px;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.05;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  color: var(--white);
  font-size: 3rem;
  margin-bottom: var(--spacing-lg);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  opacity: 0.95;
}

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

.section {
  padding: var(--spacing-2xl) 0;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

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

.btn-primary:hover {
  background-color: var(--primary-green-light);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--accent-gold);
  color: var(--white);
}

.btn-secondary:hover {
  background-color: var(--accent-gold-light);
  text-decoration: none;
}

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

.btn-outline:hover {
  background-color: var(--primary-green);
  color: var(--white);
  text-decoration: none;
}

/* Cards */
.card {
  background-color: var(--white);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  padding: var(--spacing-lg);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.card-header {
  border-bottom: 2px solid var(--light-gray);
  padding-bottom: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

/* Grid Layouts */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 1rem;
  border: 1px solid var(--light-gray);
  border-radius: 4px;
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-green);
  box-shadow: 0 0 0 3px rgba(1, 65, 28, 0.1);
}

/* Search Bar */
.search-bar {
  display: flex;
  gap: var(--spacing-sm);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

.search-input {
  flex: 1;
  padding: var(--spacing-md);
  font-size: 1rem;
  border: 2px solid var(--light-gray);
  border-radius: 4px;
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-green);
}

/* Filter Chips */
.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.chip {
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--light-gray);
  border-radius: 20px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chip:hover,
.chip.active {
  background-color: var(--primary-green);
  color: var(--white);
}

/* Book Card */
.book-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.book-thumbnail {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 4px 4px 0 0;
  background-color: var(--light-gray);
}

.book-info {
  flex: 1;
  padding: var(--spacing-md);
}

.book-title {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
  color: var(--primary-green-dark);
}

.book-author {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-sm);
}

.availability-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-available {
  background-color: var(--success);
  color: var(--white);
}

.badge-unavailable {
  background-color: var(--danger);
  color: var(--white);
}

/* Footer */
.footer {
  background-color: var(--primary-green-dark);
  color: var(--white);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

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

.footer-section h4 {
  color: var(--accent-gold);
  margin-bottom: var(--spacing-md);
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.875rem;
}

.footer-section a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    text-align: center;
  }
  
  .nav-menu {
    flex-direction: column;
    width: 100%;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.hidden { display: none; }
.flex { display: flex; }
.flex-center { display: flex; justify-content: center; align-items: center; }
.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-md); }
.gap-3 { gap: var(--spacing-lg); }