/* style.css - Premium responsive landing page inspired by Planet eBook */

/* Design Tokens */
:root {
  --font-primary: 'Inter', sans-serif;
  --font-serif: 'Georgia', serif;
  --color-primary: #1a73e8;
  --color-primary-dark: #1557b0;
  --color-bg: #fdfdfd;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-white: #ffffff;
  --radius: 4px;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 12px 24px rgba(0,0,0,0.15);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: #f1f1f1;
}
::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-dark);
}

.container {
  width: min(90%, 1100px);
  margin: 0 auto;
}

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  color: #111;
  line-height: 1.2;
}

/* Navbar */
.navbar {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(15px);
  padding: 1rem 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition);
}

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

.logo {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -1px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo span {
  color: var(--color-primary);
  position: relative;
}

.logo span::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(26, 115, 232, 0.1);
  z-index: -1;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-search {
  display: flex;
  align-items: center;
  background: #f1f3f4;
  border-radius: 20px;
  padding: 4px 12px;
  transition: var(--transition);
}

.nav-search:focus-within {
  background: #fff;
  box-shadow: 0 0 0 2px var(--color-primary);
}

.nav-search input {
  border: none;
  background: transparent;
  padding: 6px;
  width: 100px;
  font-size: 0.9rem;
  outline: none;
  transition: width 0.3s ease;
}

.nav-search input:focus {
  width: 180px;
}

.nav-search button {
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 1rem;
}

.btn-account {
  text-decoration: none;
  background-color: var(--color-primary);
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.6rem 1.5rem;
  border-radius: 30px;
  transition: var(--transition);
  box-shadow: 0 4px 10px rgba(26, 115, 232, 0.2);
}

.btn-account:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(26, 115, 232, 0.3);
}

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

.nav-links a {
  text-decoration: none;
  color: var(--color-text-light);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
}

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

.hamburger {
  display: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
}

.hamburger span {
  width: 25px;
  height: 2px;
  background-color: var(--color-text);
  transition: var(--transition);
}

.hero-section {
  padding: 10rem 0;
  text-align: center;
  background: linear-gradient(135deg, #1a73e8, #0d47a1);
  color: var(--color-white);
  border-bottom: none;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-section h1 {
  color: var(--color-white);
  font-size: clamp(2.5rem, 6vw, 4rem);
  margin-bottom: 1.5rem;
  max-width: 800px;
  margin-inline: auto;
}

.hero-section .tagline {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.25rem;
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-inline: auto;
}

.hero-section .btn-primary {
  background-color: var(--color-white);
  color: var(--color-primary);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
}

.hero-section .btn-primary:hover {
  background-color: #f0f0f0;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.hero-section .btn-link {
  color: var(--color-white);
}

.hero-section .btn-link:hover {
  border-bottom-color: var(--color-white);
}

.search-container {
  display: flex;
  gap: 0;
  max-width: 700px;
  width: 90%;
  margin: 0 auto 2.5rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  border-radius: 50px;
  overflow: hidden;
  background: var(--color-white);
  padding: 5px;
}

.search-container input {
  flex: 1;
  padding: 1rem 2rem;
  border: none;
  font-size: 1.1rem;
  outline: none;
  background: transparent;
}

.search-container .btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: 50px;
  padding: 0 2.5rem;
  box-shadow: none;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-container .btn-primary:hover {
  background-color: var(--color-primary-dark);
}

.hero-cta {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  align-items: center;
}

.btn-link {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}

.btn-link:hover {
  border-bottom-color: var(--color-primary);
}



/* Buttons */
.btn-primary {
  display: inline-block;
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 1rem 2rem;
  text-decoration: none;
  font-weight: 600;
  border-radius: var(--radius);
  transition: var(--transition);
  box-shadow: 0 4px 14px rgba(26, 115, 232, 0.4);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 115, 232, 0.23);
}

.btn-secondary {
  display: inline-block;
  background-color: transparent;
  color: var(--color-primary);
  padding: 0.6rem 1.2rem;
  text-decoration: none;
  font-weight: 600;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius);
  transition: var(--transition);
  font-size: 0.85rem;
}

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

/* Sections Base */
section {
  padding: 6rem 0;
}

section h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 5rem;
  position: relative;
}

section h2::after {
  content: '';
  position: absolute;
  bottom: -15px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--color-primary);
  border-radius: 2px;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
}

.feature-card {
  padding: 3rem 2rem;
  background: var(--color-white);
  border-radius: 12px;
  transition: var(--transition);
  border: 1px solid rgba(0, 0, 0, 0.03);
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.feature-icon {
  font-size: 2.8rem;
  margin-bottom: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(26, 115, 232, 0.08);
  width: 85px;
  height: 85px;
  border-radius: 24px;
  color: var(--color-primary);
  transition: var(--transition);
}

.feature-card:hover .feature-icon {
  background: var(--color-primary);
  color: #fff;
  transform: rotate(10deg);
}


.feature-card:hover .feature-icon {
  transform: scale(1.1) rotate(5deg);
  transition: var(--transition);
}

.feature-card p {
  color: var(--color-text-light);
}

/* Books Grid */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 4rem;
}

.book-card {
  text-align: center;
  background: transparent;
}

.book-card img {
  width: 100%;
  max-width: 220px;
  height: 310px;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: 5px 15px 35px rgba(0,0,0,0.15);
  margin-bottom: 2rem;
  transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.book-card:hover img {
  transform: translateY(-15px) scale(1.05) rotateX(10deg) rotateY(-10deg);
  box-shadow: 20px 30px 50px rgba(0,0,0,0.3);
}

.book-card h4 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  min-height: 1.2em;
}

.book-meta {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 1.5rem;
  font-style: italic;
}

/* Contact Form */
.contact-form {
  max-width: 600px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 1rem;
  border: 1px solid #ddd;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(26, 115, 232, 0.1);
}

/* Footer */
.footer {
  padding: 5rem 0 2rem;
  background-color: #f8faff;
  border-top: 1px solid #eee;
  color: var(--color-text);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 2fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.footer-col h4 {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
  color: #111;
}

.footer-about {
  margin-top: 1.5rem;
  color: var(--color-text-light);
  font-size: 0.95rem;
  max-width: 300px;
}

.footer-col ul, 
.footer-col li {
  list-style: none !important;
  padding: 0 !important;
  margin: 0 !important;
}

.footer-col li {
  margin-bottom: 0.8rem !important;
}

.footer-col ul li a {
  text-decoration: none;
  color: var(--color-text-light);
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--color-primary);
}

.footer-newsletter {
  margin-top: 1.5rem;
  display: flex;
  gap: 0.5rem;
}

.footer-newsletter input {
  flex: 1;
  padding: 0.8rem 1rem;
  border: 1px solid #ddd;
  border-radius: var(--radius);
  font-size: 0.9rem;
  outline: none;
}

.footer-newsletter .btn-primary {
  padding: 0 1.5rem;
  font-size: 0.9rem;
  box-shadow: none;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  height: auto;
  min-height: 42px;
}

.footer-newsletter input {
  min-height: 42px;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid #eee;
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.85rem;
}

/* Mobile Responsive */
@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    text-align: center;
  }
  
  .footer-about {
    margin-inline: auto;
  }
  
  .footer-newsletter {
    max-width: 350px;
    margin-inline: auto;
  }
  
  .nav-links, .btn-account {
    display: none;
  }
  
  .nav-links.open {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    gap: 1.5rem;
  }

  .nav-links.open ~ .btn-account {
    display: block; /* Show if menu is open - actually I'll just put it in the list */
  }

  .nav-search {
    display: none; /* Hide on very small screens or simplify */
  }
  
  .hamburger {
    display: flex;
  }
  
  .hero-section {
    padding: 4rem 0;
  }
  
  .features-grid, .books-grid {
    gap: 2rem;
  }
}

/* Scroll Reveal */
.section {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.section.visible {
  opacity: 1;
  transform: translateY(0);
}