/* Base styles and typography */
:root {
  --header-height: 70px;
}

body {
  background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.6)), url('https://res.cloudinary.com/dqbh6vcs8/image/upload/v1765552639/lecture-image_c51pxr.webp');
  background-size: cover;
  background-attachment: fixed;
  color: #ffffff;
  font-family: "GT America Standard", Arial, sans-serif;
  line-height: 1.6;
  padding-top: 70px;
}

/* Header section styling */
.header-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 20vh;
  width: 100%;
}

.lecture-notes-title {
  font-size: 4rem;
  padding: 20px;
  font-family: "Times New Roman", Times, serif;
  color: #ffffff;
  text-align: center;
  font-weight: 700;
  letter-spacing: 4px;
  text-transform: uppercase;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7),
               -2px -2px 4px rgba(0, 0, 0, 0.7),
               0 0 10px rgba(0, 0, 0, 0.5);
  position: relative;
  margin-bottom: 20px;
}

.lecture-notes-title::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 0;
  height: 3px;
  background-color: #ffffff;
  animation: underlineAnimation 1s ease-out forwards;
}

@keyframes underlineAnimation {
  from {
    width: 0;
  }
  to {
    width: 550px;
  }
}

/* Large tablets */
@media screen and (max-width: 1024px) {
  @keyframes underlineAnimation {
    from {
      width: 0;
    }
    to {
      width: 500px;
    }
  }
}

/* Tablets */
@media screen and (max-width: 768px) {
  @keyframes underlineAnimation {
    from {
      width: 0;
    }
    to {
      width: 300px;
    }
  }
}

/* Large phones */
@media screen and (max-width: 480px) {
  @keyframes underlineAnimation {
    from {
      width: 0;
    }
    to {
      width: 225px;
    }
  }
}

/* Small phones */
@media screen and (max-width: 320px) {
  @keyframes underlineAnimation {
    from {
      width: 0;
    }
    to {
      width: 200px;
    }
  }
}

/* Remove the fadeInDown animation */
.lecture-notes-title, .lect-sem {
  animation: none;
}

.lect-sem {
  font-size: 2.8rem;
  color: #ffffff;
  text-align: center;
  font-weight: 400;
  letter-spacing: 2px;
  opacity: 0.9;
  font-family: "Times New Roman", Times, serif;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7),
               -2px -2px 4px rgba(0, 0, 0, 0.7),
               0 0 8px rgba(0, 0, 0, 0.5);
  position: relative;
  padding-bottom: 15px;
}

.lect-sem::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 120px;
  height: 3px;
  background-color: #ffffff;
}

/* Logo styling */


/* Animation keyframes */
@keyframes fadeInDown {
  from {
      opacity: 0;
      transform: translateY(-20px);
  }
  to {
      opacity: 1;
      transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
      opacity: 0;
  }
  to {
      opacity: 1;
  }
}

/* Subject sections */
.content-slider {
  margin: 60px auto;
  width: 92%;
  max-width: 1400px;
}

.content-slider h2 {
  font-size: 2.2rem;
  font-family: "Times New Roman", Times, serif;
  color: #ffffff;
  margin: 80px 0 30px 0;
  padding-left: 20px;
  border-left: 4px solid #ffffff;
  text-transform: uppercase;
  letter-spacing: 1px;
  position: relative;
}

/* Add a line between sections */
.content-slider h2:not(:first-child)::before {
  content: '';
  position: absolute;
  top: -40px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
      to right,
      rgba(255, 255, 255, 0),
      rgba(255, 255, 255, 0.3),
      rgba(255, 255, 255, 0)
  );
}



/* Slider container */
.slider-container {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 15px;
  padding: 30px;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  position: relative;
  overflow: hidden;
  margin-bottom: 60px;
}

.slider {
  display: flex;
  gap: 25px;
  padding: 10px;
  overflow-x: auto;
  scroll-behavior: smooth;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

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

/* Slide styling */
.slide {
  flex: 0 0 275px;
  height: 275px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all 0.3s ease;
  position: relative;
  display: flex;
  flex-direction: column;
}

.slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  flex: 1;
}

.hover-text {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  color: #ffffff;
  padding: 15px;
  font-size: 1.1rem;
  font-weight: 500;
  text-align: center;
  background: rgba(0, 0, 0, 0.7);
}

.slide:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
  border-color: #ffffff;
}

/* Navigation buttons */
.slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  background: rgba(255, 255, 255, 0.2);
  border: 2px solid #ffffff;
  color: #ffffff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1.5rem;
  z-index: 10;
}

.slider-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-50%) scale(1.1);
}

.slider-btn.left {
  left: 10px;
}

.slider-btn.right {
  right: 10px;
}

/* Warning text styling */
.warning {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 15px;
  padding: 25px 40px;
  margin: 60px auto;
  max-width: 900px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.warning span {
  color: #ffffff;
  font-size: 1.2rem;
  line-height: 1.8;
  font-weight: 500;
  display: block;
  letter-spacing: 0.5px;
}

/* Footer styling */
.footer {
  padding: 20px 20px;
  margin-top: 40px;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
}

.footer h3 {
  color: #ffffff;
  font-size: 1.8rem;
  margin-bottom: 15px;
  font-family: "Times New Roman", Times, serif;
  letter-spacing: 1px;
}

.footer p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 1rem;
  margin-top: 10px;
  font-family: "GT America Standard", Arial, sans-serif;
}

/* Media Queries */
@media (max-width: 1024px) {
  .lecture-notes-title {
      font-size: 4rem;
  }
  .lect-sem {
      font-size: 2.5rem;
  }
}

@media (max-width: 768px) {
  .lecture-notes-title {
      font-size: 3.5rem;
      letter-spacing: 3px;
  }
  .lect-sem {
      font-size: 2.2rem;
  }
}

@media (max-width: 480px) {
  .lecture-notes-title {
      font-size: 2.8rem;
      letter-spacing: 2px;
  }
  .lect-sem {
      font-size: 1.8rem;
  }
  .lect-sem::after {
      width: 100px;
  }
}

@media (max-height: 600px) {
  .header-wrapper {
      min-height: 400px;
  }
}

/* Remove underline from links */
a {
  text-decoration: none;
  color: inherit;
}

/* Optional: Add hover effect without underline */
a:hover {
  text-decoration: none;
  color: inherit;
}

/* Create a fixed header container */
.header-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: rgba(0, 0, 0, 0.9);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
  z-index: 1001;
}

/* Menu bar styling */
.menu {
  background-color: rgba(0, 0, 0, 0.9); /* Add solid background */
  z-index: 1001; /* Higher than the logo's z-index of 1000 */
  position: fixed; /* Ensure it stays on top */
  width: 100%;
  top: 0;
}

/* Responsive container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Logo responsive sizing */
.logo {
  height: 0;
}

/* Responsive typography */
h1 {
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1.2;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
}

/* Slider responsive styling */
.slider-container {
  width: 100%;
  overflow: hidden;
}

.slider {
  display: flex;
  gap: 20px;
  padding: 20px;
  scroll-snap-type: x mandatory;
}

.slider-item {
  flex: 0 0 auto;
  width: calc(100% - 40px);
  scroll-snap-align: start;
}

/* Media Queries */
@media screen and (min-width: 768px) {
  .slider-item {
      width: calc(50% - 40px);
  }
}

@media screen and (min-width: 1024px) {
  .slider-item {
      width: calc(33.333% - 40px);
  }
}

/* Mobile menu adjustments */
@media screen and (max-width: 768px) {
  .menu {
      position: fixed;
      top: var(--header-height);
      left: 0;
      right: 0;
      background: rgba(0, 0, 0, 0.95);
      padding: 20px;
      transform: translateX(-100%);
      transition: transform 0.3s ease;
  }

  .menu.active {
      transform: translateX(0);
  }

  .nav-items {
      flex-direction: column;
      gap: 15px;
  }
}

/* General responsive spacing */
@media screen and (max-width: 480px) {
  :root {
      --header-height: 60px;
  }

  .container {
      padding: 0 15px;
  }

  .logo {
      height: 30px;
  }
}

/* Ensure images are responsive */
img {
  max-width: 100%;
  height: auto;
}

/* Touch-friendly buttons and interactions */
.slider-btn {
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Improve touch targets */
a, button {
  min-height: 44px;
  padding: 10px;
  display: inline-flex;
  align-items: center;
}

@media screen and (max-width: 540px) {
  .content-slider h2 {
      font-size: 1.7rem !important;

      margin: 20px 0 10px 0;
   } 
   .lecture-notes-title {
      font-size: 3rem;
      letter-spacing: 2px;
      margin-top: 20px;
      padding-bottom: 5px;
  }
  .content-slider {
    margin: 30px auto;
  }
  }

/* Tablets */
@media screen and (max-width: 768px) {
  .slide {
    flex: 0 0 240px;
    height: 240px;
  }
  
  .slider {
    gap: 20px;
    padding: 8px;
  }
  
  .hover-text {
    padding: 12px;
    font-size: 1rem;
  }
}

/* Large Mobile */
@media screen and (max-width: 576px) {
  .slide {
    flex: 0 0 220px;
    height: 220px;
  }
  
  .slider {
    gap: 15px;
    padding: 6px;
  }
  
  .hover-text {
    padding: 10px;
    font-size: 0.95rem;
  }
}

/* Mobile Portrait */
@media screen and (max-width: 480px) {
  .slide {
    flex: 0 0 200px;
    height: 200px;
  }
  
  .slider {
    gap: 12px;
    padding: 5px;
  }
  
  .hover-text {
    padding: 8px;
    font-size: 0.9rem;
  }
}

/* Small Mobile */
@media screen and (max-width: 320px) {
  .slide {
    flex: 0 0 180px;
    height: 180px;
  }
  
  .slider {
    gap: 10px;
    padding: 4px;
  }
  
  .hover-text {
    padding: 6px;
    font-size: 0.85rem;
  }
}