/* =========================================
   PROFESSIONAL BOOKSTORE - DESIGN SYSTEM
   Dark Theme with Blue & Black Palette
   ========================================= */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700&family=Playfair+Display:wght@600;700;800&display=swap');

/* =========================================
   CSS VARIABLES - COLOR PALETTE
   ========================================= */
:root {
  /* Primary Colors */
  --color-bg-primary: #0A0A0F;
  /* Deep Black Background */
  /* Background Colors - Light Theme */
  --color-bg-primary: #FFFFFF;
  --color-bg-secondary: #F8F9FA;
  --color-bg-elevated: #FFFFFF;

  /* Text Colors */
  --color-text-primary: #1A202C;
  --color-text-secondary: #4A5568;
  --color-text-muted: #718096;

  /* Accent Colors - Blue Dominant Theme */
  --color-accent-primary: #2563EB;
  /* Rich Blue - PRIMARY */
  --color-accent-secondary: #1E40AF;
  /* Darker Blue - SECONDARY */
  --color-accent-hover: #1D4ED8;
  /* Hover Blue */
  --color-gold-accent: #D4AF37;
  /* Subtle Gold accent */
  --color-gold-light: #F6E05E;
  /* Light Gold */

  /* Semantic Colors */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;

  /* Glass/Elevated Surface - Light Theme */
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(37, 99, 235, 0.1);

  /* Typography */
  --font-display: 'Playfair Display', serif;
  --font-body: 'Montserrat', sans-serif;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing Scale */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows - Light Theme */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 20px var(--color-accent-glow);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --container-max: 1280px;
  --header-height: 80px;
}

/* =========================================
   RESET & BASE STYLES
   ========================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* =========================================
   TYPOGRAPHY
   ========================================= */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
}

h4 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

.text-lg {
  font-size: 1.125rem;
  line-height: 1.7;
}

.text-sm {
  font-size: 0.875rem;
  line-height: 1.5;
}

.text-xs {
  font-size: 0.75rem;
  line-height: 1.4;
}

.text-muted {
  color: var(--color-text-muted);
}

.font-heading {
  font-family: var(--font-heading);
}

/* =========================================
   LAYOUT UTILITIES
   ========================================= */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
}

.section {
  padding: var(--spacing-3xl) 0;
}

@media (max-width: 767px) {
  .section {
    padding: var(--spacing-2xl) 0;
  }
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-sm {
  gap: var(--spacing-sm);
}

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

.grid {
  display: grid;
}

.grid-cols-1 {
  grid-template-columns: repeat(1, 1fr);
}

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

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

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

/* =========================================
   BUTTON COMPONENTS
   ========================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: var(--font-body);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-base);
  text-decoration: none;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  color: white;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35), 0 4px 8px rgba(0, 0, 0, 0.1);
  filter: brightness(1.08);
}

.btn-secondary {
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
  border: 1px solid rgba(37, 99, 235, 0.15);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

.btn-secondary:hover {
  background: rgba(37, 99, 235, 0.06);
  border-color: var(--color-accent-primary);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
  transform: translateY(-1px);
}

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

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

.btn-lg {
  padding: 1.125rem 2.5rem;
  font-size: 1.125rem;
}

.btn-sm {
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
}

.btn-promo {
  display: inline-block;
  padding: 1rem 3rem;
  font-size: 1.125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.btn-promo.btn-secondary {
  background: white;
  color: var(--color-accent-primary);
  border: none;
}

.btn-icon {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border-radius: var(--radius-full);
}

/* =========================================
   CARD COMPONENT
   ========================================= */
.card {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(37, 99, 235, 0.1);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-xl);
  border-color: rgba(37, 99, 235, 0.2);
}

.card-elevated {
  background: var(--color-bg-elevated);
  box-shadow: var(--shadow-lg);
}

/* =========================================
   BOOK CARD
   ========================================= */
.book-card {
  display: flex;
  flex-direction: column;
  background: white;
  border: 1px solid rgba(37, 99, 235, 0.08);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  height: 100%;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
}

.book-card:hover {
  border-color: rgba(37, 99, 235, 0.3);
  box-shadow: 0 12px 40px rgba(37, 99, 235, 0.18), 0 4px 12px rgba(0, 0, 0, 0.12);
  transform: translateY(-6px);
}

.book-card-image {
  position: relative;
  width: 100%;
  aspect-ratio: 2/3;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-bg-secondary), var(--color-bg-elevated));
}

.book-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.book-card:hover .book-card-image img {
  transform: scale(1.05);
}

.book-card-badge {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  color: white;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
  backdrop-filter: blur(4px);
}

.book-card-content {
  padding: var(--spacing-md);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.book-card-title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

.book-card-price {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent-secondary);
  margin-top: auto;
  margin-bottom: var(--spacing-md);
}

.book-card-actions {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.book-card-actions .btn {
  flex: 1 0 auto;
  justify-content: center;
}

/* =========================================
   FORM ELEMENTS
   ========================================= */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-primary);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
  backdrop-filter: blur(10px);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-accent-secondary);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* =========================================
   HEADER / NAVIGATION
   ========================================= */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(37, 99, 235, 0.1);
  transition: all var(--transition-base);
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-md);
  border-bottom-color: rgba(37, 99, 235, 0.15);
}

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

.logo {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

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

.nav-link {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent-secondary);
  transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-accent-secondary);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.cart-badge {
  position: relative;
}

.cart-count {
  position: absolute;
  top: -8px;
  right: -8px;
  background: var(--color-accent-secondary);
  color: white;
  width: 20px;
  height: 20px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  width: 28px;
  height: 24px;
  cursor: pointer;
}

.hamburger-line {
  width: 100%;
  height: 3px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

@media (max-width: 1023px) {
  .nav-menu {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .nav-menu.mobile-open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-xl);
  }
}

/* =========================================
   SEARCH BAR
   ========================================= */
.search-bar {
  position: relative;
  width: 100%;
  max-width: 600px;
  margin: 0 auto var(--spacing-xl) auto;
}

.search-input {
  width: 100%;
  padding: 1rem 3.5rem 1rem 1.25rem;
  background: var(--glass-bg);
  border: 2px solid var(--glass-border);
  border-radius: var(--radius-full);
  color: var(--color-text-primary);
  font-size: 1rem;
  transition: all var(--transition-fast);
  backdrop-filter: blur(10px);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-accent-secondary);
  box-shadow: var(--shadow-glow);
}

.search-btn {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.25rem;
  transition: all var(--transition-fast);
}

.search-btn:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-50%) scale(1.05);
}

/* =========================================
   HERO SECTION
   ========================================= */
.hero {
  min-height: 85vh;
  display: flex;
  align-items: center;
  padding-top: calc(var(--header-height) + var(--spacing-2xl));
  padding-bottom: var(--spacing-3xl);
  background: linear-gradient(135deg, #EBF4FF 0%, #FFF9E6 50%, #EBF4FF 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(37, 99, 235, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(212, 175, 55, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-title {
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--color-text-primary), var(--color-accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  color: var(--color-text-secondary);
  max-width: 800px;
  margin: 0 auto;
}

/* Homepage specific hero styles */
.hero-home {
  /* background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%); */
  /* User requested to keep original background */
  position: relative;
}


.hero-home .hero-title {
  background: linear-gradient(135deg, var(--color-gold-light), var(--color-gold-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.hero-home .hero-subtitle {
  color: #FFFFFF;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.5);
  font-weight: 500;
  margin-bottom: var(--spacing-xl);
  /* Increased spacing for button */
}

.hero-about .hero-content h1,
.hero-about .hero-content p {
  color: #FFFFFF !important;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
  /* Improve readability */
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* =========================================
   RATING COMPONENT
   ========================================= */
.rating {
  display: flex;
  gap: 0.25rem;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.star {
  color: #FFC107;
  font-size: 1rem;
}

.star.empty {
  color: var(--color-text-muted);
}

.rating-text {
  margin-left: var(--spacing-xs);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* =========================================
   FOOTER
   ========================================= */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--glass-border);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-3xl);
}

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

.footer-section h3 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-link {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-accent-secondary);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--glass-border);
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* =========================================
   AUTHOR SPOTLIGHT
   ========================================= */
.author-spotlight {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.author-spotlight-image {
  position: relative;
}

.author-spotlight-image img {
  width: 100%;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  border: 2px solid var(--glass-border);
}

.author-spotlight-content h2 {
  font-size: clamp(2rem, 4vw, 2.5rem);
  margin-bottom: var(--spacing-md);
}

.author-quote {
  background: var(--glass-bg);
  border-left: 4px solid var(--color-accent-secondary);
  padding: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  border-radius: var(--radius-md);
  font-style: italic;
}

.author-quote i {
  color: var(--color-accent-secondary);
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  display: block;
}

.author-quote p {
  color: var(--color-text-primary);
  font-size: 1.125rem;
  margin: 0;
}

@media (max-width: 767px) {
  .author-spotlight {
    grid-template-columns: 1fr;
  }
}

/* =========================================
   FILTER COMPONENTS
   ========================================= */
.filter-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.filter-checkbox {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.filter-checkbox:hover {
  background: var(--glass-bg);
}

.filter-checkbox input[type="checkbox"],
.filter-checkbox input[type="radio"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--color-accent-secondary);
}

.filter-checkbox span {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

.price-slider {
  width: 100%;
  height: 6px;
  background: var(--glass-bg);
  border-radius: var(--radius-full);
  outline: none;
  cursor: pointer;
}

.price-slider::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: var(--shadow-md);
}

.price-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  border: none;
}

@media (max-width: 1023px) {
  .filters-sidebar {
    display: none;
  }
}

/* =========================================
   SEARCH AUTOCOMPLETE
   ========================================= */
.search-results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--color-bg-elevated);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  max-height: 400px;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  display: none;
  z-index: 100;
}

.search-results.active {
  display: block;
}

.search-result-item {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--glass-border);
  cursor: pointer;
  transition: background var(--transition-fast);
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.search-result-item:hover {
  background: var(--glass-bg);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-image {
  width: 50px;
  height: 75px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.search-result-details h4 {
  font-size: 1rem;
  margin: 0 0 var(--spacing-xs) 0;
  color: var(--color-text-primary);
}

.search-result-details p {
  font-size: 0.875rem;
  margin: 0;
  color: var(--color-text-muted);
}

/* =========================================
   UTILITY CLASSES
   ========================================= */
.text-center {
  text-align: center;
}

.mt-auto {
  margin-top: auto;
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

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

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.mb-xl {
  margin-bottom: var(--spacing-xl);
}

.hidden {
  display: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* =========================================
   ANIMATIONS
   ========================================= */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

@keyframes glow {

  0%,
  100% {
    box-shadow: 0 0 20px var(--color-accent-glow);
  }

  50% {
    box-shadow: 0 0 30px rgba(76, 110, 245, 0.5);
  }
}

.animate-glow {
  animation: glow 2s ease-in-out infinite;
}

/* =========================================
   RESPONSIVE UTILITIES
   ========================================= */
@media (max-width: 767px) {

  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {

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

@media (min-width: 1024px) {
  .grid-cols-3 {
    grid-template-columns: repeat(3, 1fr);
  }

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

/* =========================================
   BOOK MODAL STYLES
   ========================================= */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: var(--spacing-md);
  overflow-y: auto;
}

.modal-overlay.active {
  display: flex;
}

.modal-container {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-xl);
  max-width: 900px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  animation: modalSlideIn 0.3s ease-out;
  position: relative;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-30px) scale(0.95);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  position: sticky;
  top: 0;
  background: var(--color-bg-elevated);
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 10;
}

.modal-close {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--color-bg-secondary);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  color: var(--color-text-primary);
  font-size: 1.5rem;
}

.modal-close:hover {
  background: var(--color-accent-primary);
  color: white;
  transform: rotate(90deg);
}

.modal-body {
  padding: var(--spacing-xl);
}

.book-modal-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.book-modal-image {
  position: relative;
}

.book-modal-image img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.book-modal-details h2 {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.book-modal-genre {
  color: var(--color-text-muted);
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
}

.book-modal-price {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent-secondary);
  margin-bottom: var(--spacing-lg);
}

.book-modal-description {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
}

.book-modal-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.book-modal-divider {
  height: 1px;
  background: var(--glass-border);
  margin: var(--spacing-2xl) 0;
}

/* =========================================
   REVIEW SYSTEM STYLES
   ========================================= */
.reviews-section {
  margin-top: var(--spacing-2xl);
}

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

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

.average-rating {
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-accent-secondary);
  line-height: 1;
}

.rating-details {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.rating-stars-large {
  display: flex;
  gap: 0.25rem;
}

.rating-stars-large .star {
  font-size: 1.25rem;
}

.review-count {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.review-form {
  background: var(--color-bg-secondary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-xl);
  border: 1px solid var(--glass-border);
}

.review-form h3 {
  margin-bottom: var(--spacing-md);
  font-size: 1.25rem;
}

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

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--color-text-primary);
}

.star-rating-input {
  display: flex;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

.star-rating-input .star-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 2rem;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
  padding: 0;
}

.star-rating-input .star-btn:hover,
.star-rating-input .star-btn.active {
  color: #FFC107;
  transform: scale(1.2);
}

.reviews-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.review-card {
  background: var(--color-bg-secondary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  transition: all var(--transition-base);
}

.review-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent-primary);
}

.review-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
}

.reviewer-name {
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.review-date {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.review-rating {
  display: flex;
  gap: 0.125rem;
  margin-bottom: var(--spacing-sm);
}

.review-text {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.review-count-badge {
  position: absolute;
  top: var(--spacing-sm);
  left: var(--spacing-sm);
  background: white;
  color: var(--color-accent-secondary);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 0.25rem;
  z-index: 5;
}

.review-count-badge i {
  font-size: 0.875rem;
}

/* Make book cards clickable */
.book-card {
  cursor: pointer;
  user-select: none;
}

.book-card:active {
  transform: translateY(-2px);
}

/* Loading state */
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--color-text-muted);
}

.empty-state i {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-muted);
}

/* =========================================
   ENHANCED RESPONSIVE DESIGN
   ========================================= */
@media (max-width: 767px) {
  .book-modal-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .modal-body {
    padding: var(--spacing-md);
  }

  .book-modal-details h2 {
    font-size: 1.5rem;
  }

  .book-modal-price {
    font-size: 1.5rem;
  }

  .book-modal-actions {
    flex-direction: column;
  }

  .book-modal-actions .btn {
    width: 100%;
    padding: 0.625rem 1rem;
    font-size: 0.8rem;
    white-space: normal;
    /* Allow text wrapping */
    height: auto;
    text-align: center;
    line-height: 1.2;
    justify-content: center;
  }

  .reviews-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }

  .average-rating {
    text-align: left;
  }

  /* Book Card Mobile Optimization */
  .book-card-content {
    padding: 0.75rem;
  }

  .book-card-title {
    font-size: 0.9375rem;
    line-height: 1.25;
    margin-bottom: 0.25rem;
  }

  .book-card-meta {
    font-size: 0.75rem;
    margin-bottom: 0.375rem;
  }

  .book-card-price {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
  }

  .book-card-actions {
    flex-direction: column;
    gap: 0.375rem;
  }

  .book-card-actions .btn {
    width: 100%;
    padding: 0.625rem 1rem;
    font-size: 0.8rem;
    white-space: normal;
    height: auto;
    text-align: center;
    line-height: 1.2;
    justify-content: center;
  }

  /* Responsive Promo Card */
  .card[style*="background: linear-gradient"] {
    padding: var(--spacing-lg) !important;
  }

  .card h2[style*="clamp(3rem, 8vw, 5rem)"] {
    font-size: 2.5rem !important;
    word-break: break-word;
    /* Prevent long words from overflowing */
  }

  .btn-promo {
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
    width: 100%;
    white-space: normal;
    text-align: center;
    max-width: 100%;
    /* Ensure it doesn't exceed container */
    box-sizing: border-box;
    /* Include padding in width */
  }

  .book-card-badge {
    padding: 0.25rem 0.5rem;
    font-size: 0.625rem;
  }

  .logo {
    font-size: 1.25rem;
    /* Reduced from default */
  }

  .rating {
    gap: 0.125rem;
  }


  .star {
    font-size: 0.875rem;
  }
}

@media (max-width: 767px) {
  .hero-subtitle {
    font-size: 1rem !important;
  }

  /* Search bar mobile */
  .search-bar {
    max-width: 100%;
  }

  .search-input {
    font-size: 0.875rem;
    padding: 0.875rem 3rem 0.875rem 1rem;
  }

  .search-btn {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .book-modal-content {
    grid-template-columns: 1fr 1.5fr;
  }

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

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Print styles */
@media print {

  .header,
  .nav,
  .modal-overlay,
  .btn,
  .footer {
    display: none !important;
  }

  .book-card {
    page-break-inside: avoid;
  }
}

/* =========================================
   HERO BACKGROUND STYLES
   ========================================= */

/* Base Hero Setup */
.hero {
  position: relative;
  padding: var(--spacing-4xl) 0;

  /* Background properties - MATCHING ORIGINAL STATE */
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
  /* Reverted to center/cover */

  color: white;
}

/* Specific Background Images & Overlays */
.hero-home {
  background-image: linear-gradient(rgba(10, 10, 15, 0.75), rgba(10, 10, 15, 0.85)), url('images/author_with_books.png');
}

.hero-about {
  background-image: linear-gradient(rgba(10, 10, 15, 0.7), rgba(10, 10, 15, 0.8)), url('images/2.png');
}