:root {
    --bg-color: #0d1117;
    --text-color: #e6edf3;
    --accent-color: #58a6ff;
    --card-bg: rgba(22, 27, 34, 0.15);
    --border-color: #30363d;
    --font-main: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
}

#background-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    position: relative;
    z-index: 1;
}

.hero-section {
    text-align: center;
    margin-bottom: 60px;
    padding-top: 40px;
}

.main-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--accent-color);
    margin-bottom: 10px;
}

.main-title a {
    text-decoration: none;
    color: inherit;
}

@media (max-width: 768px) {
    .main-title {
        font-size: 2.2rem;
    }
    
    .hero-section {
        padding-top: 20px;
        margin-bottom: 40px;
    }
}

.subtitle {
    font-size: 1.5rem;
    color: #8b949e;
    font-weight: 300;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(3px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.card h2 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    color: var(--accent-color);
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

@media (min-width: 768px) {
    .info-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* Location & Date */
.location-date {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.info-item {
    display: flex;
    gap: 15px;
    align-items: flex-start;
}

.info-icon {
    font-size: 2rem;
    line-height: 1;
    background: rgba(88, 166, 255, 0.1);
    padding: 10px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 50px;
    width: 50px;
}

.info-content h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #8b949e;
    margin-bottom: 4px;
    font-weight: 600;
}

.info-content .date,
.info-content .venue {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-color);
    line-height: 1.4;
}

.info-content .sub-venue {
    font-size: 0.95rem;
    color: #8b949e;
    margin-bottom: 5px;
}

.map-link {
    display: inline-block;
    font-size: 0.9rem;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    margin-top: 2px;
}

.map-link:hover {
    text-decoration: underline;
}

/* Call for Papers */
.cta-button {
    background-color: var(--accent-color);
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 15px;
    transition: transform 0.2s, background-color 0.2s;
}

.cta-button:hover {
    transform: translateY(-2px);
    background-color: #409eff;
}

/* Schedule */
.schedule-overview p {
    margin-bottom: 10px;
    color: var(--text-color);
}

.schedule-overview strong {
    color: var(--accent-color);
    font-weight: 600;
}

.schedule-item {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid rgba(48, 54, 61, 0.5);
}

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

.schedule-item .time {
    font-weight: 600;
    min-width: 100px;
    color: #8b949e;
}

.schedule-item .event {
    font-weight: 400;
}

/* Organizers */
.organizer-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

@media (min-width: 650px) {
    .organizer-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (min-width: 1024px) {
    .organizer-list {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}

.organizer {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 10px 12px;
    border-radius: 10px;
    text-decoration: none;
    color: inherit;
    transition: background-color 0.15s ease, transform 0.15s ease;
}

.organizer:hover {
    background-color: rgba(88, 166, 255, 0.08);
    transform: translateY(-1px);
}

.organizer:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.organizer .avatar {
    width: 110px;
    height: 110px;
    border-radius: 50%;
    overflow: hidden;
    flex: 0 0 auto;
    background-color: var(--border-color);
}

.organizer .avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.organizer .name {
    display: block;
    font-weight: 600;
}

.organizer .role {
    display: block;
    margin-top: 2px;
    font-size: 0.88rem;
    font-weight: 500;
    color: #c9d1d9;
}

.organizer .affiliation {
    display: block;
    font-size: 0.82rem;
    color: #8b949e;
    opacity: 0.9;
    font-style: italic;
}

footer {
    text-align: center;
    color: #484f58;
    margin-top: 40px;
    font-size: 0.9rem;
}


/* add css for logo image */
.logo-img {
    width: 50%;
    height: auto;
    margin-bottom: 20px;
    /* center the logo */
    display: block;
    margin-left: auto;
    margin-right: auto;
} 


/* style the links in the intro text */
.intro-text a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
}