:root {
  --main-color: #ee8e3a;
  --second-color: #1a1a2e;
  --text-color: #eaeaea;
  --bg-color: #0f0f1e;
  --card-bg: #16213e;
  --hover-bg: #1f2b47;
}

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

body {
  font-family: "Open Sans", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--second-color);
  box-shadow: 0 2px 15px rgba(0, 0, 0, 0.2);
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 40px;
}

.logo {
  font-size: 32px;
  font-weight: bold;
  color: var(--main-color);
  letter-spacing: 2px;
  text-transform: lowercase;
  font-family: "Cairo", sans-serif;
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 35px;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: #fff;
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  text-transform: capitalize;
  padding: 8px 15px;
  border-radius: 6px;
  transition: all 0.3s ease;
  position: relative;
}

.nav-links a:hover {
  background-color: rgba(238, 142, 58, 0.15);
  color: var(--main-color);
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background-color: var(--main-color);
  transition: width 0.3s ease;
}

.nav-links a:hover::after {
  width: 70%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 25px;
}

.cart-icon {
  position: relative;
  cursor: pointer;
  padding: 10px;
  color: #fff;
  transition: all 0.3s ease;
}

.cart-icon:hover {
  color: var(--main-color);
  transform: scale(1.1);
}

.cart-icon i {
  font-size: 24px;
}

.cart-count {
  position: absolute;
  top: 2px;
  right: 0;
  background-color: #e74c3c;
  color: white;
  font-size: 12px;
  font-weight: bold;
  padding: 3px 7px;
  border-radius: 50%;
  min-width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.signup-btn {
  background-color: transparent;
  color: var(--main-color);
  border: 2px solid var(--main-color);
  padding: 10px 28px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 30px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: capitalize;
  text-decoration: none;
}

.signup-btn:hover {
  background-color: var(--main-color);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(238, 142, 58, 0.3);
}

.login-btn {
  background-color: var(--main-color);
  color: #fff;
  border: 2px solid var(--main-color);
  padding: 10px 28px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 30px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: capitalize;
  text-decoration: none;
}

.login-btn:hover {
  background-color: transparent;
  color: var(--main-color);
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(238, 142, 58, 0.3);
}

.landing-page {
  min-height: 100vh;
  background: linear-gradient(rgba(20, 22, 25, 0.25), rgba(20, 22, 25, 0.25)),
    url("https://images.unsplash.com/photo-1481627834876-b7833e8f5570?w=1920")
      center/cover;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 80px;
  position: relative;
}

.landing-page .overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(20, 22, 25, 0.8);
  z-index: 1;
}

.intro-text {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #fff;
  max-width: 900px;
  padding: 40px;
  animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.intro-text h1 {
  font-size: 3.5rem;
  margin-bottom: 25px;
  font-weight: 700;
  line-height: 1.2;
  text-shadow: 2px 2px 20px rgba(0, 0, 0, 0.3);
}

.intro-text p {
  font-size: 1.4rem;
  line-height: 1.8;
  margin-bottom: 35px;
  opacity: 0.95;
}

.explore-btn {
  background-color: var(--main-color);
  color: #fff;
  border: 3px solid var(--main-color);
  padding: 15px 45px;
  font-size: 18px;
  font-weight: 600;
  border-radius: 35px;
  cursor: pointer;
  transition: all 0.4s ease;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.explore-btn:hover {
  background-color: transparent;
  transform: scale(1.05);
  box-shadow: 0 10px 30px rgba(238, 142, 58, 0.4);
}

.about-us {
  padding: 80px 40px;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  color: var(--text-color);
  max-width: 1200px;
  margin: 60px auto;
  border-radius: 20px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(238, 142, 58, 0.2);
}

.about-us h2,
.about-us h3 {
  color: #fff;
  text-align: center;
  margin-bottom: 20px;
}

.about-us h2 {
  font-size: 2.8rem;
  font-weight: 700;
}

.about-us h3 {
  font-size: 2.2rem;
  margin-top: 40px;
}

.about-us p {
  font-size: 1.2rem;
  line-height: 1.8;
  text-align: center;
  color: #b8b8b8;
}

.about-us .values {
  margin-top: 40px;
}

.values ul {
  list-style: none;
  margin-top: 25px;
  padding-left: 0;
}

.values li {
  font-size: 1.15rem;
  margin-bottom: 15px;
  padding-left: 30px;
  position: relative;
  color: #b8b8b8;
}

.values li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #fff;
  font-weight: bold;
  font-size: 1.3rem;
}

.quote-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 50px;
  padding: 60px 40px;
  background-color: var(--card-bg);
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
  max-width: 1200px;
  margin: 60px auto;
  border-radius: 15px;
  border: 1px solid rgba(238, 142, 58, 0.2);
}

.author-img {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 5px solid var(--main-color);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.quote-box {
  max-width: 600px;
}

.quote {
  font-size: 1.4rem;
  font-style: italic;
  color: #d4d4d4;
  line-height: 1.8;
  margin-bottom: 15px;
}

.author {
  font-weight: bold;
  font-size: 1.2rem;
  color: var(--main-color);
}

.carousel-container {
  position: relative;
  max-width: 1400px;
  margin: 60px auto;
  padding: 40px;
}

.carousel-container h1 {
  font-size: 3rem;
  text-align: center;
  color: var(--main-color);
  text-transform: uppercase;
  margin-bottom: 50px;
  font-weight: 700;
  letter-spacing: 3px;
  position: relative;
}

.carousel-container h1::after {
  content: "";
  position: absolute;
  bottom: -15px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 4px;
  background-color: var(--main-color);
}

.bestseller {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  scroll-behavior: smooth;
  padding: 20px 10px;
  scrollbar-width: none;
}

.bestseller::-webkit-scrollbar {
  display: none;
}

.card {
  min-width: 220px;
  max-width: 220px;
  background: var(--card-bg);
  border-radius: 15px;
  padding: 15px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  transition: all 0.3s ease;
  cursor: pointer;
  border: 1px solid rgba(238, 142, 58, 0.1);
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 35px rgba(238, 142, 58, 0.3);
}

.book-image img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  border-radius: 10px;
  margin-bottom: 15px;
}

.book-details p:first-child {
  font-size: 18px;
  font-weight: bold;
  color: var(--text-color);
  margin-bottom: 8px;
}

.book-details p:nth-child(2) {
  font-size: 14px;
  color: #999;
  margin-bottom: 10px;
}

.rate {
  color: var(--main-color);
  font-size: 1.1rem;
}

.arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: var(--main-color);
  color: #fff;
  border: none;
  padding: 15px 20px;
  font-size: 24px;
  cursor: pointer;
  border-radius: 50%;
  transition: all 0.3s ease;
  z-index: 10;
}

.arrow:hover {
  background-color: var(--second-color);
  transform: translateY(-50%) scale(1.1);
}

.arrow.left {
  left: 10px;
}

.arrow.right {
  right: 10px;
}

.featured-categories {
  max-width: 1400px;
  margin: 80px auto;
  padding: 40px;
}

.featured-categories .title {
  font-size: 3rem;
  text-align: center;
  color: var(--main-color);
  text-transform: uppercase;
  margin-bottom: 60px;
  font-weight: 700;
  letter-spacing: 3px;
  position: relative;
}

.featured-categories .title::after {
  content: "";
  position: absolute;
  bottom: -15px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 4px;
  background-color: var(--main-color);
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  padding: 20px;
}

.category-card {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 40px 30px;
  text-align: center;
  transition: all 0.4s ease;
  cursor: pointer;
  border: 2px solid rgba(238, 142, 58, 0.1);
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(238, 142, 58, 0.1),
    transparent
  );
  transition: left 0.5s ease;
}

.category-card:hover::before {
  left: 100%;
}

.category-card:hover {
  transform: translateY(-10px);
  border-color: var(--main-color);
  box-shadow: 0 15px 40px rgba(238, 142, 58, 0.3);
}

.category-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--main-color), #f39c12);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 25px;
  transition: all 0.3s ease;
}

.category-card:hover .category-icon {
  transform: scale(1.1) rotate(10deg);
}

.category-icon i {
  font-size: 36px;
  color: #fff;
}

.category-card h3 {
  font-size: 24px;
  color: var(--text-color);
  margin-bottom: 12px;
  font-weight: 700;
}

.category-card p {
  font-size: 15px;
  color: #9a9a9a;
  margin-bottom: 20px;
  line-height: 1.6;
}

.books-count {
  display: inline-block;
  background: rgba(238, 142, 58, 0.15);
  color: var(--main-color);
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
}

.newsletter-section {
  background: linear-gradient(135deg, #1a1a2e 0%, var(--card-bg) 100%);
  padding: 80px 40px;
  margin: 80px 0;
  position: relative;
  overflow: hidden;
}

.newsletter-section::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(238, 142, 58, 0.1), transparent);
  border-radius: 50%;
}

.newsletter-section::after {
  content: "";
  position: absolute;
  bottom: -50%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(238, 142, 58, 0.1), transparent);
  border-radius: 50%;
}

.newsletter-container {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.newsletter-content {
  text-align: center;
  background: var(--card-bg);
  padding: 60px 40px;
  border-radius: 25px;
  box-shadow: 0 15px 50px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(238, 142, 58, 0.2);
}

.newsletter-content i.fa-envelope-open-text {
  font-size: 60px;
  color: var(--main-color);
  margin-bottom: 25px;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.newsletter-content h2 {
  font-size: 2.5rem;
  color: var(--text-color);
  margin-bottom: 20px;
  font-weight: 700;
}

.newsletter-content p {
  font-size: 1.1rem;
  color: #9a9a9a;
  margin-bottom: 35px;
  line-height: 1.8;
}

.newsletter-form {
  display: flex;
  gap: 15px;
  max-width: 600px;
  margin: 0 auto 40px;
}

.newsletter-input {
  flex: 1;
  padding: 18px 25px;
  border: 2px solid rgba(238, 142, 58, 0.3);
  border-radius: 50px;
  font-size: 16px;
  background: var(--bg-color);
  color: var(--text-color);
  outline: none;
  transition: all 0.3s ease;
}

.newsletter-input:focus {
  border-color: var(--main-color);
  box-shadow: 0 0 0 4px rgba(238, 142, 58, 0.1);
}

.newsletter-input::placeholder {
  color: #666;
}

.newsletter-btn {
  background: linear-gradient(135deg, var(--main-color), #f39c12);
  color: #fff;
  border: none;
  padding: 18px 40px;
  border-radius: 50px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.newsletter-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(238, 142, 58, 0.4);
}

.newsletter-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #9a9a9a;
  font-size: 14px;
}

.stat-item i {
  color: var(--main-color);
  font-size: 18px;
}

.footer {
  background: linear-gradient(135deg, #0a0a15 0%, var(--second-color) 100%);
  color: var(--text-color);
  padding: 60px 40px 30px;
  border-top: 2px solid rgba(238, 142, 58, 0.2);
}

.footer-container {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-section h3.footer-logo {
  font-size: 32px;
  font-weight: bold;
  color: var(--main-color);
  letter-spacing: 2px;
  text-transform: lowercase;
  font-family: "Cairo", sans-serif;
  margin-bottom: 20px;
}

.footer-description {
  font-size: 15px;
  color: #9a9a9a;
  line-height: 1.8;
  margin-bottom: 25px;
}

.social-links {
  display: flex;
  gap: 15px;
}

.social-links a {
  width: 45px;
  height: 45px;
  background: rgba(238, 142, 58, 0.1);
  border: 2px solid rgba(238, 142, 58, 0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--main-color);
  font-size: 18px;
  transition: all 0.3s ease;
}

.social-links a:hover {
  background: var(--main-color);
  color: #fff;
  transform: translateY(-5px);
  box-shadow: 0 5px 20px rgba(238, 142, 58, 0.4);
}

.footer-section h4 {
  font-size: 20px;
  color: var(--text-color);
  margin-bottom: 25px;
  font-weight: 700;
  position: relative;
  padding-bottom: 12px;
}

.footer-section h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 3px;
  background: var(--main-color);
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 12px;
}

.footer-section ul li a {
  color: #9a9a9a;
  text-decoration: none;
  font-size: 15px;
  transition: all 0.3s ease;
  display: inline-block;
}

.footer-section ul li a:hover {
  color: var(--main-color);
  padding-left: 8px;
}

.contact-info li {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #9a9a9a;
  font-size: 15px;
}

.contact-info i {
  color: var(--main-color);
  font-size: 16px;
  margin-bottom: 8px;
  width: 20px;
}

.footer-bottom {
  max-width: 1400px;
  margin: 0 auto;
  padding-top: 30px;
  border-top: 1px solid rgba(238, 142, 58, 0.2);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-bottom p {
  color: #9a9a9a;
  font-size: 14px;
}

.footer-links {
  display: flex;
  gap: 15px;
  align-items: center;
}

.footer-links a {
  color: #9a9a9a;
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s ease;
}

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

.footer-links span {
  color: #666;
}

.cart-page {
  margin-top: 100px;
  padding: 20px;
  max-width: 1200px;
  margin-inline: auto;
  min-height: 60vh;
}

.cart-page .title {
  font-size: 2rem;
  margin-bottom: 20px;
  color: var(--main-color);
  border-bottom: 2px solid var(--card-bg);
  padding-bottom: 10px;
}

.cart-container {
  display: flex;
  gap: 30px;
  align-items: flex-start;
}

#cart-items {
  flex: 2;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.cart-item {
  display: flex;
  align-items: center;
  gap: 20px;
  background-color: var(--card-bg);
  padding: 15px;
  border-radius: 8px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cart-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  background-color: var(--hover-bg);
}

.cart-item img {
  width: 80px;
  height: 110px;
  object-fit: cover;
  border-radius: 5px;
}

.cart-item-info {
  flex: 1;
}

.cart-item-info h4 {
  margin-bottom: 5px;
  font-size: 1.1rem;
}

.cart-item-info p {
  color: var(--main-color);
  font-weight: bold;
}

.quantity-controls {
  display: flex;
  align-items: center;
  gap: 15px;
  background-color: var(--bg-color);
  padding: 5px 10px;
  border-radius: 5px;
}

.quantity-controls button {
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 1.2rem;
  cursor: pointer;
  transition: color 0.2s;
  padding: 0 5px;
}

.quantity-controls button:hover {
  color: var(--main-color);
}

.quantity-controls span {
  font-weight: bold;
  min-width: 20px;
  text-align: center;
}

.remove-btn {
  padding: 10px 15px;
  background-color: #ff4757;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.2s;
}

.remove-btn:hover {
  background-color: #ff6b81;
}

.cart-summary {
  flex: 1;
  background-color: var(--card-bg);
  padding: 25px;
  border-radius: 8px;
  position: sticky;
  top: 100px; 
}

.cart-summary h3 {
  font-size: 1.5rem;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--hover-bg);
  padding-bottom: 10px;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  margin-top: 15px;
  font-size: 1.2rem;
  font-weight: bold;
}

.checkout-btn {
  width: 100%;
  margin-top: 25px;
  padding: 12px;
  background-color: var(--main-color);
  color: white;
  border: none;
  border-radius: 5px;
  font-size: 1.1rem;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.2s;
}

.checkout-btn:hover {
  background-color: #d97b2e;
  transform: translateY(-2px);
}

.empty-cart-msg {
  text-align: center;
  padding: 40px;
  background-color: var(--card-bg);
  border-radius: 8px;
  font-size: 1.2rem;
}

@media (max-width: 768px) {
  .cart-container {
    flex-direction: column;
  }
  .cart-summary {
    width: 100%;
    position: static;
  }
  .cart-item {
    flex-direction: column;
    align-items: flex-start;
  }
  .cart-item img {
    width: 100%;
    height: 200px;
  }
  .cart-item > div, .remove-btn {
    width: 100%;
    justify-content: space-between;
  }
}

@media (max-width: 992px) {
  .header-container {
    padding: 15px 25px;
  }

  .logo {
    font-size: 28px;
  }

  .nav-links {
    gap: 20px;
  }

  .nav-links a {
    font-size: 15px;
  }

  .intro-text h1 {
    font-size: 2.8rem;
  }

  .intro-text p {
    font-size: 1.2rem;
  }

  .about-us {
    padding: 60px 30px;
  }

  .about-us h2 {
    font-size: 2.4rem;
  }

  .about-us h3 {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  .header-container {
    flex-wrap: wrap;
    padding: 12px 20px;
  }

  .nav-links {
    order: 3;
    width: 100%;
    justify-content: space-around;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    gap: 10px;
  }

  .nav-links a {
    font-size: 14px;
    padding: 6px 10px;
  }

  .intro-text {
    padding: 30px 20px;
  }

  .intro-text h1 {
    font-size: 2.2rem;
  }

  .intro-text p {
    font-size: 1.1rem;
  }

  .quote-container {
    flex-direction: column;
    gap: 30px;
    text-align: center;
    padding: 40px 20px;
  }

  .author-img {
    width: 150px;
    height: 150px;
  }

  .card {
    min-width: 180px;
    max-width: 180px;
  }

  .book-image img {
    height: 240px;
  }

  .carousel-container {
    padding: 30px 20px;
  }

  .carousel-container h1 {
    font-size: 2.4rem;
  }

  .arrow {
    padding: 12px 16px;
    font-size: 20px;
  }

  .categories-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
  }

  .newsletter-content {
    padding: 40px 25px;
  }

  .newsletter-content h2 {
    font-size: 2rem;
  }

  .newsletter-form {
    flex-direction: column;
  }

  .newsletter-stats {
    gap: 20px;
  }

  .footer-container {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 576px) {
  .logo {
    font-size: 24px;
  }

  .nav-links a {
    font-size: 12px;
    padding: 4px 8px;
  }

  .cart-icon i {
    font-size: 20px;
  }

  .cart-count {
    font-size: 11px;
    min-width: 20px;
    height: 20px;
  }

  .signup-btn,
  .login-btn {
    padding: 8px 20px;
    font-size: 14px;
  }

  .intro-text h1 {
    font-size: 1.8rem;
  }

  .intro-text p {
    font-size: 1rem;
  }

  .explore-btn {
    padding: 12px 35px;
    font-size: 16px;
  }

  .about-us {
    padding: 40px 20px;
    margin: 40px 20px;
  }

  .about-us h2 {
    font-size: 2rem;
  }

  .about-us h3 {
    font-size: 1.6rem;
  }

  .about-us p {
    font-size: 1rem;
  }

  .quote {
    font-size: 1.1rem;
  }

  .author {
    font-size: 1rem;
  }

  .carousel-container h1 {
    font-size: 2rem;
    margin-bottom: 30px;
  }

  .card {
    min-width: 160px;
    max-width: 160px;
  }

  .book-image img {
    height: 220px;
  }

  .featured-categories .title {
    font-size: 2rem;
  }

  .category-card {
    padding: 30px 20px;
  }

  .newsletter-content i.fa-envelope-open-text {
    font-size: 45px;
  }

  .newsletter-content h2 {
    font-size: 1.6rem;
  }

  .newsletter-btn {
    padding: 15px 30px;
  }
}

@media (max-width: 400px) {
  .logo {
    font-size: 20px;
  }

  .nav-links {
    gap: 5px;
  }

  .nav-links a {
    font-size: 11px;
    padding: 3px 6px;
  }

  .header-actions {
    gap: 15px;
  }

  .signup-btn,
  .login-btn {
    padding: 6px 16px;
    font-size: 13px;
  }

  .intro-text h1 {
    font-size: 1.5rem;
  }
  .carousel-container h1 {
    font-size: 1.8rem;
  }
}