/* Reset and Base Styles */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: 'Roboto', sans-serif;
      min-height: 100vh;
      color: #1f2937;
      background: #ffffff;
      position: relative;
      overflow-x: hidden;
    }

    /* Navigation */
    .nav-bar {
      background: white;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      position: sticky;
      top: 0;
      z-index: 1000;
      padding: 1rem 2rem;
    }

    .navbar-brand {
      color: black;
      font-size: clamp(1.25rem, 3vw, 1.5rem);
      font-weight: 700;
      text-decoration: none;
    }

    .nav-links {
      display: flex;
      gap: 1.5rem;
      list-style: none;
      margin: 0;
      padding: 0;
      transition: all 0.3s ease;
    }

    .nav-links li a {
      color: black;
      font-weight: 500;
      text-decoration: none;
      font-size: clamp(0.9rem, 2.5vw, 1rem);
      transition: color 0.2s ease;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: #f84f4f;
    }

    .nav-links li a:focus {
      outline: 2px solid #1d4ed8;
      outline-offset: 2px;
    }

    .nav-toggle {
      display: none;
      color: black;
      font-size: 1.5rem;
      cursor: pointer;
      background: none;
      border: none;
      padding: 0.5rem;
    }

    .nav-toggle svg {
      stroke: black;
      width: 24px;
      height: 24px;
    }

    .nav-toggle:focus {
      outline: 2px solid #1d4ed8;
      outline-offset: 2px;
    }

    /* Header Image */
    .header-image {
      position: relative;
      width: 95%;
      margin: 0 auto;
      height: 400px;
      overflow: hidden;
      aspect-ratio: 16 / 9;
    }

    .header-img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      object-position: center;
    }

    .overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.5);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: white;
      text-align: center;
      padding: clamp(0.5rem, 2vw, 1rem);
    }

    .overlay h1 {
      font-size: clamp(1.5rem, 5vw, 2.5rem);
      font-weight: 700;
      color: #ffffff;
      text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5), 0 0 8px rgba(255, 255, 255, 0.3);
      letter-spacing: 0.05em;
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 1s ease-out, transform 1s ease-out;
      margin-bottom: 0.5rem;
    }

    .overlay h1.visible {
      opacity: 1;
      transform: translateY(0);
    }

    .tag-line {
      font-size: clamp(0.7rem, 2.5vw, 1.1rem);
      color: #ffffff;
      font-style: italic;
      text-align: center;
      margin-top: 0.4rem;
      padding: 0.4rem;
      animation: fadeIn 0.6s ease-out;
    }

    /* About Section */
    #about {
      padding: clamp(1rem, 5vw, 2rem) clamp(1rem, 3vw, 1.5rem);
      text-align: center;
    }

    #about p {
      text-align: justify;
      font-size: clamp(0.9rem, 2.5vw, 1.125rem);
      color: #4b5563;
      line-height: 1.6;
      max-width: 100%;
      margin: 0 auto 1rem;
    }

    #about p strong {
      color: #1f2937;
    }
    #about mark {
      background: #e0f2fe;
      padding: 0.2rem 0.4rem;
    }

    /* Speakers Section */
    .speakers-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: clamp(0.8rem, 2vw, 1.2rem);
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
    }

    .speaker-card,
    .student-card,
    .department-card,
    .sponsor-card {
      border-radius: 8px;
      background: #f2f2f2;
      text-align: center;
      padding: clamp(0.8rem, 2vw, 1.2rem);
      box-sizing: border-box;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      max-width: 95%;
      margin-left: auto;
      margin-right: auto;
    }

    .speaker-card,
    .student-card {
      width: clamp(160px, 25vw, 220px);
      height: clamp(220px, 35vw, 280px);
    }

    .department-card {
      width: clamp(200px, 30vw, 260px);
      height: clamp(260px, 40vw, 320px);
      background: linear-gradient(#ffffff, #f9fafb);
      border: 1px solid #e5e7eb;
      padding: clamp(0.8rem, 2vw, 1.2rem);
    }

    .speaker-card:hover,
    .student-card:hover,
    .department-card:hover,
    .sponsor-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    }

    .speaker-card img,
    .student-card img,
    .department-card img,
    .sponsor-card img {
      width: clamp(80px, 15vw, 120px);
      height: clamp(80px, 15vw, 120px);
      border-radius: 50%;
      object-fit: cover;
      margin-bottom: 0.75rem;
    }

    .department-card img {
      width: clamp(80px, 12vw, 110px);
      height: clamp(80px, 12vw, 110px);
      object-fit: contain;
    }

    .sponsor-card img {
      width: clamp(100px, 20vw, 150px);
      height: clamp(100px, 20vw, 150px);
      object-fit: contain;
    }

    .speaker-card h3,
    .student-card h3,
    .department-card h3,
    .sponsor-card h3 {
      margin: 0.5rem 0;
      font-size: clamp(1rem, 2.5vw, 1.25rem);
      color: #000000;
      font-weight: 500;
    }

    .department-card h3 {
      font-size: clamp(1rem, 2.5vw, 1.25rem);
    }

    .sponsor-card h3 {
      font-size: clamp(1rem, 2.5vw, 1.25rem);
    }

    .speaker-card p,
    .student-card p,
    .department-card p,
    .sponsor-card p {
      margin: 0.2rem 0;
      font-size: clamp(0.8rem, 2vw, 1rem);
      color: #4b5563;
    }

    .department-card p {
      font-size: clamp(0.8rem, 2vw, 1rem);
    }

    /* All Speakers List */
    .info-card {
      padding: clamp(1rem, 3vw, 2rem);
      text-align: center;
      border: 2px solid transparent;
      border-radius: 12px;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
      background: linear-gradient(#ffffff, #ffffff) padding-box, linear-gradient(45deg, #1d4ed8, #06b6d4) border-box;
      animation: fadeIn 0.6s ease-out;
      transition: box-shadow 0.3s ease, transform 0.3s ease;
    }

    .info-card:hover {
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
      transform: translateY(-4px);
    }

    .speakers-list {
      margin: 0 auto;
      padding: clamp(1rem, 2vw, 1.5rem);
      text-align: left;
    }

    .speakers-list ul {
      list-style: disc;
      padding-left: 1.5rem;
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
      max-width: 800px;
      margin: 0;
    }

    .speakers-list li {
      font-size: clamp(0.9rem, 2.5vw, 1.125rem);
      color: #1f2937;
      line-height: 1.6;
      text-align: left;
    }

    .speakers-list li a {
      color: #2563eb;
      text-decoration: underline;
      transition: color 0.2s ease;
    }

    .speakers-list li a:hover {
      color: #1e40af;
    }

    /* PDF Viewer */
    #pdf-container,
    #pdf-container-poster {
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: clamp(1rem, 2vw, 1.5rem);
      background: #ffffff;
      border: 2px solid transparent;
      border-radius: 12px;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
      background: linear-gradient(#ffffff, #ffffff) padding-box, linear-gradient(45deg, #1d4ed8, #06b6d4) border-box;
      max-width: 1400px;
      margin: 0 auto;
      width: 100%;
    }

    #pdf-render,
    #pdf-render-poster {
      border: 1px solid #d1d5db;
      border-radius: 8px;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
      max-width: 100%;
      width: 100%;
      height: auto;
    }

    #controls,
    #controls-poster {
      display: flex;
      align-items: center;
      gap: clamp(0.5rem, 2vw, 1rem);
      margin-top: 1rem;
      flex-wrap: wrap;
      justify-content: center;
    }

    #controls button,
    #controls-poster button {
      background: #1d4ed8;
      color: #ffffff;
      padding: clamp(0.4rem, 1vw, 0.5rem) clamp(0.8rem, 2vw, 1rem);
      border: none;
      border-radius: 4px;
      cursor: pointer;
      font-size: clamp(0.8rem, 2vw, 0.9rem);
      transition: background 0.3s;
    }

    #controls button:hover,
    #controls-poster button:hover {
      background: #1e40af;
    }

    .download-btn {
      background: linear-gradient(90deg, #1d4ed8, #06b6d4);
      color: white;
      padding: clamp(8px, 2vw, 12px) clamp(16px, 3vw, 24px);
      border-radius: 4px;
      font-weight: 500;
      font-size: clamp(0.8rem, 2vw, 1rem);
      text-decoration: none;
      transition: background 0.3s ease, transform 0.3s ease;
    }

    .download-btn:hover {
      background: linear-gradient(90deg, #1e40af, #0ea5e9);
      transform: translateY(-2px);
    }

    .download-btn:focus {
      outline: 2px solid #1d4ed8;
      outline-offset: 2px;
    }

    .hidden {
      display: none;
    }

    /* Registration Section */
    .cta-button {
      background: linear-gradient(90deg, #1d4ed8, #06b6d4);
      color: white;
      padding: clamp(8px, 2vw, 12px) clamp(16px, 3vw, 24px);
      border-radius: 4px;
      font-weight: 500;
      font-size: clamp(0.8rem, 2vw, 1rem);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      animation: pulse 2s infinite;
      text-decoration: none;
    }

    .cta-button:hover {
      background: linear-gradient(90deg, #1e40af, #0ea5e9);
      transform: translateY(-2px) scale(1.05);
      box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
    }

    /* Fee Table */
    .table-wrapper {
      margin-top: 1rem;
      width: 100%;
      overflow-x: auto;
    }

    .fee-table {
      width: 100%;
      border-collapse: collapse;
      table-layout: auto;
    }

    .fee-table th,
    .fee-table td {
      border: 1px solid #d1d5db;
      padding: clamp(8px, 2vw, 12px);
      text-align: center;
      font-size: clamp(0.8rem, 2vw, 0.95rem);
      font-weight: 400;
    }

    .fee-table th {
      background: linear-gradient(90deg, #1d4ed8, #06b6d4);
      color: white;
      font-weight: 600;
    }

    .fee-table tr:nth-child(even) {
      background: #f9fafb;
    }

    .fee-table tr:hover {
      background: #e0f2fe;
    }

    /* Sponsors Section */
    .sponsor-card a {
      text-decoration: none;
      color: inherit;
      display: flex;
      flex-direction: column;
      align-items: center;
      width: 100%;
      height: 100%;
      justify-content: center;
    }

    .sponsors-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: clamp(0.8rem, 2vw, 1.2rem);
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
    }

    /* Footer */
    footer .link-button {
      color: #1d4ed8;
      text-decoration: none;
      transition: color 0.3s ease;
      font-size: clamp(0.8rem, 2vw, 0.9rem);
    }

    footer .link-button:hover {
      color: #06b6d4;
    }

    .social-icon {
      transition: color 0.3s ease;
    }

    .social-icon:hover {
      color: #1d4ed8;
    }

    /* Animations */
    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(15px); }
      to { opacity: 1; transform: translateY(0); }
    }

    @keyframes pulse {
      0%, 100% { transform: scale(1); }
      50% { transform: scale(1.03); }
    }

    /* Responsive Adjustments */
    @media (max-width: 1200px) {
      .speakers-grid,
      .sponsors-grid {
        gap: 1rem;
      }
      .speaker-card,
      .student-card {
        width: 200px;
        height: 260px;
      }
      .department-card {
        width: 240px;
        height: 300px;
      }
    }

    @media (max-width: 1024px) {
      .nav-bar {
        padding: 1rem 1.5rem;
      }
      .header-image {
        height: 350px;
      }
      .overlay {
        padding: 0.8rem;
      }
      #about {
        padding: 1.5rem 1rem;
      }
      .info-card {
        padding: 1.5rem;
      }
      #pdf-container,
      #pdf-container-poster {
        padding: 1rem;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        align-items: center;
        width: 100%;
        padding: 1rem 0;
        background: white;
        position: absolute;
        top: 100%;
        left: 0;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-toggle {
        display: block;
      }
      .header-image {
        width: 95%;
        height: 300px;
      }
      .overlay h1 {
        font-size: 2rem;
      }
      .tag-line {
        font-size: 0.75rem;
      }
      .speaker-card,
      .student-card {
        width: 276px;
        height: 359px;
      }
      .speaker-card img,
      .student-card img {
        width: 115px;
        height: 115px;
      }
      .speaker-card h3,
      .student-card h3 {
        font-size: 1.2rem;
      }
      .speaker-card p,
      .student-card p {
        font-size: 0.95rem;
      }
      .department-card {
        width: 304px;
        height: 380px;
      }
      .department-card img {
        width: 99px;
        height: 99px;
      }
      .department-card h3 {
        font-size: 1.3rem;
      }
      .department-card p {
        font-size: 1.05rem;
      }
      .sponsor-card {
        width: 220px;
        height: 240px;
      }
      .fee-table {
        display: block;
      }
      .fee-table thead {
        display: none;
      }
      .fee-table tbody,
      .fee-table tr {
        display: block;
        margin-bottom: 1.25rem;
        border: 1px solid #d1d5db;
        border-radius: 10px;
      }
      .fee-table td {
        display: block;
        text-align: left;
        padding: 14px;
        border: none;
        border-bottom: 1px solid #e5e7eb;
      }
      .fee-table td:before {
        content: attr(data-label);
        font-weight: 600;
        color: #1d4ed8;
        display: block;
        margin-bottom: 6px;
      }
      footer .grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      footer .flex {
        justify-content: center;
      }
      #registration-fee,
      #registration-link {
        font-size: 1.75rem;
      }
    }

    @media (max-width: 600px) {
      .header-image {
        height: 200px;
      }
      .overlay h1 {
        font-size: 1.5rem;
        margin-bottom: 0.3rem;
      }
      .overlay {
        padding: 0.5rem;
      }
      .download-btn {
        padding: 8px 16px;
        font-size: 0.9rem;
      }
      .speaker-card,
      .student-card {
        width: 248px;
        height: 331px;
      }
      .speaker-card img,
      .student-card img {
        width: 115px;
        height: 115px;
      }
      .speaker-card h3,
      .student-card h3 {
        font-size: 1.2rem;
      }
      .speaker-card p,
      .student-card p {
        font-size: 0.95rem;
      }
      .department-card {
        width: 278px;
        height: 354px;
      }
      .department-card img {
        width: 99px;
        height: 99px;
      }
      .department-card h3 {
        font-size: 1.3rem;
      }
      .department-card p {
        font-size: 1.05rem;
      }
      .sponsor-card {
        width: 180px;
        height: 210px;
      }
      #about p {
        font-size: 0.95rem;
        line-height: 1.5;
      }
      #pdf-container,
      #pdf-container-poster {
        padding: 0.8rem;
      }
      #controls,
      #controls-poster {
        flex-direction: column;
        gap: 0.5rem;
      }
      .info-card {
        padding: 1rem;
      }
      #registration-fee,
      #registration-link {
        font-size: 1.5rem;
      }
      .cta-button {
        padding: 8px 16px;
        font-size: 0.9rem;
      }
      .fee-table th,
      .fee-table td {
        padding: 10px;
        font-size: 0.85rem;
      }
      footer .grid {
        gap: 1.5rem;
      }
      footer p,
      footer .link-button {
        font-size: 0.85rem;
      }
      .social-icon svg {
        width: 24px;
        height: 24px;
      }
    }

    @media (max-width: 480px) {
      .navbar-brand {
        font-size: 1.25rem;
      }
      .nav-links li a {
        font-size: 0.9rem;
        padding: 0.5rem 0;
      }
      .nav-toggle svg {
        width: 20px;
        height: 20px;
      }
      .header-image {
        height: 180px;
      }
      .overlay h1 {
        font-size: 1.25rem;
      }
      .tag-line {
        font-size: 0.65rem;
        margin-top: 0.2rem;
      }
      .download-btn {
        padding: 6px 12px;
        font-size: 0.8rem;
      }
      .speakers-grid,
      .sponsors-grid {
        flex-direction: column;
        align-items: center;
      }
      .speaker-card,
      .student-card {
        width: 221px;
        height: 304px;
      }
      .speaker-card img,
      .student-card img {
        width: 104px;
        height: 104px;
      }
      .speaker-card h3,
      .student-card h3 {
        font-size: 1.1rem;
      }
      .speaker-card p,
      .student-card p {
        font-size: 0.9rem;
      }
      .department-card {
        width: 253px;
        height: 329px;
      }
      .department-card img {
        width: 88px;
        height: 88px;
      }
      .department-card h3 {
        font-size: 1.2rem;
      }
      .department-card p {
        font-size: 0.95rem;
      }
      .sponsor-card {
        width: 160px;
        height: 200px;
      }
      .sponsor-card img {
        width: 100px;
        height: 100px;
      }
      #about {
        padding: 1rem 0.8rem;
      }
      #about p {
        font-size: 0.85rem;
        line-height: 1.4;
      }
      .info-card {
        padding: 0.8rem;
      }
      .speakers-list {
        padding: 1rem;
      }
      .speakers-list li {
        font-size: 0.95rem;
      }
      #pdf-container,
      #pdf-container-poster {
        padding: 0.5rem;
      }
      #controls button,
      #controls-poster button {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
      }
      .fee-table th,
      .fee-table td {
        padding: 8px;
        font-size: 0.8rem;
      }
      .table-wrapper {
        margin-top: 0.5rem;
      }
      .cta-button {
        padding: 6px 12px;
        font-size: 0.8rem;
      }
      footer .grid {
        gap: 1rem;
      }
      footer h3 {
        font-size: 1rem;
      }
      footer p,
      footer .link-button {
        font-size: 0.8rem;
      }
      .social-ishal-icon svg {
        width: 20px;
        height: 20px;
      }
    }

    @media (max-width: 360px) {
      .navbar-brand {
        font-size: 1.1rem;
      }
      .nav-links li a {
        font-size: 0.85rem;
      }
      .header-image {
        height: 160px;
      }
      .overlay h1 {
        font-size: 1.1rem;
      }
      .tag-line {
        font-size: 0.6rem;
      }
      .download-btn {
        padding: 5px 10px;
        font-size: 0.75rem;
      }
      .speaker-card,
      .student-card {
        width: 193px;
        height: 276px;
      }
      .speaker-card img,
      .student-card img {
        width: 92px;
        height: 92px;
      }
      .speaker-card h3,
      .student-card h3 {
        font-size: 1rem;
      }
      .speaker-card p,
      .student-card p {
        font-size: 0.85rem;
      }
      .department-card {
        width: 228px;
        height: 304px;
      }
      .department-card img {
        width: 77px;
        height: 77px;
      }
      .department-card h3 {
        font-size: 1.1rem;
      }
      .department-card p {
        font-size: 0.9rem;
      }
      .sponsor-card {
        width: 140px;
        height: 180px;
      }
      .sponsor-card img {
        width: 80px;
        height: 80px;
      }
      #about p {
        font-size: 0.8rem;
        line-height: 1.3;
      }
      .speakers-list li {
        font-size: 0.85rem;
      }
      .info-card {
        padding: 0.6rem;
      }
      #registration-fee,
      #registration-link {
        font-size: 1.25rem;
      }
      .fee-table td:before {
        font-size: 0.75rem;
      }
    }

    /* Enhanced Styles for Registration Headers */
    #registration-fee, #registration-link {
      position: relative;
      font-size: clamp(1.5rem, 5vw, 2rem);
      font-weight: 800;
      text-align: center;
      padding-bottom: 0.5rem;
      margin-bottom: 1.5rem;
      animation: fadeIn 0.8s ease-out;
      text-transform: uppercase;
      background: linear-gradient(90deg, #1d4ed8, #06b6d4);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      transition: transform 0.3s ease;
    }

    #registration-fee::after, #registration-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 60px;
      height: 4px;
      background: linear-gradient(90deg, #1d4ed8, #06b6d4);
      border-radius: 2px;
    }

    #registration-fee:hover, #registration-link:hover {
      transform: scale(1.05);
    }

    #registration-link {
      text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    }

    #registration-link::before {
      content: '★';
      color: #1d4ed8;
      margin-right: 0.5rem;
    }