/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #009688;
    --secondary-color: #00796b;
    --accent-color: #4db6ac;
    --text-dark: #333;
    --text-light: #666;
    --border-color: #e0e0e0;
    --bg-light: #f5f5f5;
    --white: #ffffff;
    --navbar-height: 60px; /* consistent navbar height for positioning */
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Open Sans', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.3s ease;
}

a:hover {
    color: var(--secondary-color);
}

/* ===== Full Screen Hero Slider ===== */
.hero-slider-container {
    position: relative;
    width: 100%;
    height: calc(100vh - var(--navbar-height));
    margin-top: var(--navbar-height);
    overflow: hidden;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-slide.active {
    opacity: 1;
}

.slide-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.slide-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.30);
}

.slide-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--white);
    padding: 20px;
    width: 100%;
    max-width: 900px;
}

.slide-inner {
    background: rgba(255, 255, 255, 0.45);
    padding: 3rem 2rem;
    border-radius: 5px;
    color: var(--text-dark);
    backdrop-filter: blur(3px);
    box-shadow: 0 6px 18px rgba(0,0,0,0.06);
}

.slide-title {
    font-size: 4rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.slide-subtitle {
    font-size: 2rem;
    font-weight: 400;
    color: var(--text-dark);
    margin-bottom: 2rem;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
}

.slide-info {
    font-size: 1.2rem;
    line-height: 1.8;
    color: #000000;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.slide-info p {
    margin: 0.5rem 0;
    color: #000000;
}

.slide-info a {
    color: #000000;
    font-weight: 500;
}

.slide-info a:hover {
    color: #000000;
}

.slide-dates {
    font-weight: 600;
    color: var(--secondary-color);
    margin-top: 1rem !important;
}

.welcome-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #004d40;
    margin-bottom: 2rem;
}

.welcome-text {
    font-size: 1.1rem;
    text-align: left;
    line-height: 1.8;
}

.welcome-text p {
    margin-bottom: 1.5rem;
}

.dates-large {
    text-align: left;
}

.date-item-large {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.date-item-large:last-child {
    border-bottom: none;
}

.date-item-large strong {
    display: block;
    font-size: 1.2rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.date-item-large span {
    display: block;
    font-size: 1.4rem;
    color: #004d40;
    font-weight: 600;
}

/* ===== Navigation Bar ===== */
.navbar {
    background-color: var(--primary-color);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
    position: fixed !important;
    top: 0 !important;
    left: 0;
    width: 100%;
    z-index: 1000;
    height: var(--navbar-height);
    transform: translateY(0) !important;
    visibility: visible !important;
    opacity: 1 !important;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0;
    flex-direction: row;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    padding: 1rem 0;
    order: 2;
}

.nav-toggle {
    order: 1;
}

.nav-menu {
    order: 3;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
}

.nav-menu li {
    position: relative;
}

.nav-menu a {
    display: block;
    padding: 1.2rem 1.5rem;
    color: var(--white);
    text-decoration: none;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
}

.nav-menu a:hover,
.nav-menu a.active {
    background-color: var(--secondary-color);
    border-bottom-color: #ff6f00;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 1rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--white);
    margin: 3px 0;
    transition: all 0.3s ease;
}

/* ===== Main Content ===== */
.main-wrapper {
    padding: 0.5rem 0;
}

.main-wrapper:first-of-type {
    padding-top: 0.25rem;
}

/* ===== Sponsors Bar ===== */
.sponsors-bar {
    background-color: var(--white);
    padding: 0.25rem 0 1.5rem 0;
    margin-top: 0;
}

.sponsors-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .sponsors-container {
        flex-direction: column;
        gap: 1rem;
    }
}

.sponsor-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 60px;
    padding: 0 0.8rem;
}

.sponsor-logo img {
    max-width: 100%;
    max-height: 60px;
    object-fit: contain;
}

.content-section {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.content-section:last-child {
    border-bottom: none;
}

.content-section:first-child {
    margin-top: 0;
    padding-top: 0;
}

.content-section h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--primary-color);
}

.content-section h3 {
    font-size: 1.6rem;
    color: var(--secondary-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.content-section h4 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.content-section p {
    margin-bottom: 1rem;
    text-align: justify;
    line-height: 1.8;
}

/* ===== Organizers ===== */
.organizer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.organizer-card {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 8px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    will-change: transform;
}

.organizer-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.organizer-card h4,
.organizer-card p {
    backface-visibility: hidden;
    -webkit-font-smoothing: subpixel-antialiased;
}

.organizer-photo {
    width: 150px;
    height: 150px;
    margin: 0 auto 1rem;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--primary-color);
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.organizer-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    display: block;
    flex-shrink: 0;
}

.organizer-card h4 {
    color: var(--primary-color);
    margin: 1rem 0 0.5rem;
}

.org-affiliation {
    font-style: italic;
    color: var(--text-light);
    margin-bottom: 0.5rem !important;
}

.org-email {
    margin-top: 0.5rem !important;
}

.org-email a {
    font-size: 0.9rem;
}

/* Old organizer item styles (kept for compatibility) */
.organizer-item {
    margin-bottom: 2.5rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-left: 4px solid var(--primary-color);
}

.org-bio {
    margin-top: 1rem;
    line-height: 1.8;
}

/* ===== Dates Table ===== */
.dates-table {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 8px;
    margin: 2rem 0;
}

.date-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 2px solid var(--border-color);
}

.date-row:last-child {
    border-bottom: none;
}

.date-label {
    font-weight: 600;
    color: var(--secondary-color);
}

.date-value {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.1rem;
}

/* ===== Lists ===== */
.topic-list {
    list-style: none;
    padding: 0;
}

.topic-list li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    line-height: 1.6;
}

/* ===== Committee ===== */
.committee-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.committee-column ul {
    list-style: none;
    padding: 0;
}

.committee-column li {
    padding: 0.4rem 0;
    font-size: 0.95rem;
    line-height: 1.5;
}

/* ===== Contact ===== */
.contact-info {
    margin: 2rem 0;
    text-align: left;
}

.contact-info p {
    margin: 0.75rem 0;
    text-align: left;
}

.external-links {
    margin: 2rem 0;
    text-align: left;
}

.external-links p {
    margin: 0.5rem 0;
    text-align: left;
}

@media (max-width: 768px) {
    .contact-info,
    .contact-info p,
    .external-links,
    .external-links p {
        text-align: left;
    }
    
    #contact h2,
    #contact h3 {
        text-align: left;
    }
}

/* ===== FAIR Section ===== */
.news-section {
    background-color: var(--white);
    padding: 3rem 0;
}

.section-padding {
    padding: 2rem 0;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -15px;
}

.featured-block {
    width: 100%;
    padding: 0 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .featured-block {
        flex-direction: column;
        gap: 1rem;
    }
}

.featured-block a {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
}

.featured-block img {
    max-height: 80px;
    max-width: 100%;
    object-fit: contain;
}

.d-flex {
    display: flex;
}

.justify-content-center {
    justify-content: center;
}

.align-items-center {
    align-items: center;
}

/* ===== Organization Section ===== */
.organization-section {
    background-color: var(--white);
    padding: 3rem 0;
    text-align: center;
    border-top: 2px solid var(--primary-color);
}

.organization-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.organization-content h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin: 0;
}

.organization-logo {
    max-width: 200px;
    width: 100%;
}

.organization-logo a {
    display: inline-block;
    transition: transform 0.3s ease;
}

.organization-logo a:hover {
    transform: scale(1.1);
}

.organization-logo img {
    max-height: 120px;
    width: auto;
    object-fit: contain;
}

/* ===== Footer ===== */
.footer {
    background-color: #2c3e50;
    color: var(--white);
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer p {
    margin: 0.5rem 0;
    opacity: 0.9;
}

/* ===== Responsive Design ===== */
@media (max-width: 992px) {
    .committee-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: var(--navbar-height);
        flex-direction: column;
        background-color: var(--primary-color);
        width: 100%;
        text-align: center;
        transition: all 0.3s ease;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
        z-index: 2001; /* ensure menu overlays other content */
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        width: 100%;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-menu a {
        padding: 1rem;
    }

    .nav-toggle {
        display: flex !important;
        z-index: 1001;
        margin-right: auto;
        margin-left: 0;
        order: 1;
    }

    .navbar .container {
        padding: 0 15px;
    }

    .nav-brand {
        padding: 1rem;
        order: 2;
        flex: 1;
        text-align: center;
    }

    .hero-slider-container {
        height: calc(100vh - var(--navbar-height));
        margin-top: var(--navbar-height);
    }

    .slide-title {
        font-size: 2.5rem;
    }

    .slide-subtitle {
        font-size: 1.5rem;
    }

    .slide-inner {
        padding: 2rem 1.5rem;
    }

    .welcome-title {
        font-size: 2rem;
    }

    .committee-list {
        grid-template-columns: 1fr;
    }

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

    .organizer-grid {
        grid-template-columns: 1fr;
    }

    .date-row {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .date-label {
        font-size: 0.95rem;
    }

    .date-value {
        font-size: 1rem;
    }

    .sponsors-container {
        gap: 1.5rem;
    }

    .sponsor-logo {
        height: 60px;
        padding: 0 0.5rem;
    }

    .sponsor-logo img {
        max-height: 60px;
    }
}

@media (max-width: 480px) {
    .slide-title {
        font-size: 2rem;
    }

    .slide-subtitle {
        font-size: 1.2rem;
    }

    .slide-info {
        font-size: 1rem;
    }

    .content-section h2 {
        font-size: 1.7rem;
    }

    .content-section h3 {
        font-size: 1.3rem;
    }
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.content-section {
    animation: fadeIn 0.6s ease-in-out;
}