/* 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/v1765552641/pyq_sbvl4a.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;
  }
  
  /* Desktop (default) */
  @keyframes underlineAnimation {
    from {
      width: 0;
    }
    to {
      width: 200px;
    }
  }
  
  /* Large tablets */
  @media (max-width: 1024px) {
    @keyframes underlineAnimation {
      from {
        width: 0;
      }
      to {
        width: 180px;
      }
    }
    
    .lecture-notes-title::after {
      height: 2.5px;
    }
  }
  
  /* Tablets */
  @media (max-width: 768px) {
    @keyframes underlineAnimation {
      from {
        width: 0;
      }
      to {
        width: 160px;
      }
    }
    
    .lecture-notes-title::after {
      height: 2.5px;
    }
  }
  
  /* Large Mobile */
  @media (max-width: 480px) {
    @keyframes underlineAnimation {
      from {
        width: 0;
      }
      to {
        width: 140px;
      }
    }
    
    .lecture-notes-title::after {
      height: 2px;
    }
  }
  
  /* Small Mobile */
  @media (max-width: 320px) {
    @keyframes underlineAnimation {
      from {
        width: 0;
      }
      to {
        width: 120px;
      }
    }
    
    .lecture-notes-title::after {
      height: 2px;
    }
  }
  
  .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);
    animation: none;
    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;
    animation: none;
  }
  
  /* 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;
  }
}