:root {
    --ms-blue: #0078D4;
    --ms-light-blue: #50E6FF;
    --ms-dark-blue: #0A2647;
    --ms-grey: #F5F5F5;
    --ms-dark-grey: #333333;
    --ms-text: #252525;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --border-radius: 4px;
    --transition: all 0.3s ease;
}

.responsive { width: 100%; height: auto; }

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

body {
    font-family: 'Segoe UI', 'San Francisco', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--ms-text);
    background-color: #FAFAFA;
}

.header {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo-container {
    display: flex;
    align-items: center;
}

.logo-line {
    height: 40px;
    width: 4px;
    background-color: var(--ms-blue);
    margin-right: 12px;
}

.logo-text {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--ms-dark-grey);
}

.main-container {
    max-width: 1200px;
    margin: 120px auto 60px;
    padding: 0 2rem;
}

.hero-section {
    background: linear-gradient(135deg, var(--ms-blue), var(--ms-dark-blue));
    color: white;
    border-radius: var(--border-radius);
    padding: 3rem 2rem;
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
    box-shadow: var(--card-shadow);
}

.hero-section::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 40%;
    background: url('../images/AIWebinar.png') no-repeat right center;
    background-size: cover;
    opacity: 0.2;
}

.hero-content {
    width: 60%;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.2rem;
    font-weight: 300;
    margin-bottom: 1.5rem;
}

.hero-details {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-top: 2rem;
}

.detail-item {
    display: flex;
    align-items: center;
    font-weight: 500;
}

.detail-icon {
    margin-right: 0.5rem;
    font-size: 1.1rem;
}

.about-section {
    margin-bottom: 2rem;
}

.section-title {
    color: var(--ms-blue);
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.8rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--ms-blue);
}

.about-text {
    margin-bottom: 1.5rem;
}

.what-to-expect {
    margin-bottom: 2rem;
}

.expect-list {
    list-style-type: none;
    margin-left: 1rem;
}

.expect-item {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

table, th, td {
  border: 1px solid black;
  border-collapse: collapse;
  padding: 4px;
}

.expect-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5rem;
    width: 8px;
    height: 8px;
    background-color: var(--ms-blue);
    border-radius: 50%;
}

main .sessions-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

@media (min-width: 1200px) {
    main .sessions-container {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (min-width: 769px) and (max-width: 1199px) {
    main .sessions-container {
        grid-template-columns: repeat(3, 1fr);
    }
}

main .session-card {
    background-color: #f0f8ff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

main .session-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
}
    .session-box {
      background-color: #f9f9f9;
      padding: 15px 20px;
      border-radius: 6px;
      margin-bottom: 20px;
      border-left: 4px solid #0078d4;
    }
main .session-card .session-content {
    padding: 1.5rem;
}

main .session-card .session-title {
    color: var(--ms-dark-grey);
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 0;
    min-height: 3.5rem;
    line-height: 1.2;
}

main .session-card .session-date {
    display: flex;
    align-items: center;
    margin-bottom: 0.8rem;
    color: #1A3985;
    font-size: 18px;
    font-weight: 600;
}

main .session-card .session-date-icon {
    margin-right: 0.5rem;
    color: var(--ms-blue);
}

main .session-card details {
    padding: 5px; 
    border: 5px solid #f7f7f7;
    border-radius: 3px;
}
main .session-card summary {
    list-style-position: outside;
    margin-left: 30px;
    padding: 5px 5px 5px 10px;
    border-radius: 5px;
}

main .session-card .register-btn {
    display: inline-block;
    background-color: #1A3985;
    color: white;
    padding: 0.7rem 1.5rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    margin-top: 1rem;
    border: none;
    cursor: pointer;
}

main .session-card .register-btn:hover {
    background-color: var(--ms-dark-blue);
}

/* Accordion styles */
main .accordion-item {
    margin-bottom: 1rem;
}

main .accordion-header {
    width: 100%;
    background: #0C55B8;
    border: none;
    padding: 0.25rem 1rem;
    text-align: left;
    cursor: pointer;
    font-size: 1.2rem;
    font-weight: 400;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-radius: var(--border-radius);
    color: white;
}

main .accordion-header:hover {
    background-color: #0A4499;
}

main .accordion-header:focus {
    outline: 2px solid var(--ms-blue);
    outline-offset: -2px;
}

main .accordion-header::after {
    content: '>';
    font-size: 2rem;
    color: white;
    transition: transform 0.3s ease;
}

main .accordion-header[aria-expanded="true"]::after {
    content: '↓';
}

main .accordion-panel {
    display: none;
    padding: 1rem 0;
}

main .accordion-header h3 {
    font-weight: 400;
}

.accordion-header h3.bolder {
    font-weight: 550;
}

main .session-list {
    list-style: none;
    padding: 0;
}

main .session-item {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid #eee;
    align-items: center;
}

main .session-item:last-child {
    border-bottom: none;
}

main .session-actions {
    display: flex;
    gap: 0.5rem;
}

main .btn-primary, main .btn-outline {
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    display: inline-block;
    min-height: 44px;
    min-width: 44px;
    text-align: center;
}

main .btn-primary {
    background-color: var(--ms-blue);
    color: white;
    border: 1px solid var(--ms-blue);
}

main .btn-primary:hover {
    background-color: var(--ms-dark-blue);
}

main .btn-outline {
    background: white;
    color: var(--ms-blue);
    border: 1px solid var(--ms-blue);
}

main .btn-outline:hover {
    background-color: var(--ms-blue);
    color: white;
}

@media (max-width: 768px) {
    main .session-item {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    main .session-actions {
        justify-content: flex-start;
        flex-wrap: wrap;
    }
}

@media (prefers-reduced-motion: reduce) {
    main .accordion-header, main .btn-primary, main .btn-outline {
        transition: none;
    }
    main .accordion-header::after {
        transition: none;
    }
}

.footer {
    background-color: var(--ms-dark-grey);
    color: white;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-logo {
    display: flex;
    align-items: center;
}

.footer-logo-line {
    height: 30px;
    width: 3px;
    background-color: var(--ms-blue);
    margin-right: 10px;
}

.footer-logo-text {
    font-weight: 600;
    font-size: 0.9rem;
}

.footer-copyright {
    font-size: 0.8rem;
    opacity: 0.7;
}

@media (max-width: 768px) {
    .nav-container, .main-container, .footer-container {
        padding: 1rem;
    }
    
    .hero-content {
        width: 100%;
    }
    
    .hero-section::after {
        width: 100%;
        opacity: 0.1;
    }
    
    main .sessions-container {
        grid-template-columns: 1fr;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}