:root {
    --bg-color: #0b0d17;
    --accent-primary: #3d5afe;
    /* Electric Blueish */
    --accent-secondary: #00e5ff;
    /* Cyan */
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-highlight: rgba(255, 255, 255, 0.05);
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Noto Sans JP', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.8;
    overflow-x: hidden;
    position: relative;
    -webkit-font-smoothing: antialiased;
}

/* Background Animation Placeholder using CSS Gradients */
.background-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background:
        radial-gradient(circle at 15% 50%, rgba(61, 90, 254, 0.15), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(0, 229, 255, 0.15), transparent 25%);
    filter: blur(40px);
    animation: bgPulse 10s ease-in-out infinite alternate;
}

@keyframes bgPulse {
    0% {
        transform: scale(1);
        opacity: 0.8;
    }

    100% {
        transform: scale(1.1);
        opacity: 1;
    }
}

/* Navigation */
.glass-nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    background: rgba(11, 13, 23, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 0;
    transition: all 0.3s ease;
}

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

.logo {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.25rem;
    background: linear-gradient(135deg, #fff, var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 0.5px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--accent-secondary);
}

/* Hero Section */
#hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 2rem;
    position: relative;
}

.eyebrow {
    font-family: var(--font-heading);
    color: var(--accent-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.85rem;
    margin-bottom: 1rem;
    display: block;
}

h1 {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    background: linear-gradient(180deg, #fff, #b0b0b0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.event-details {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 3rem;
    font-family: var(--font-heading);
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--glass-bg);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    border: 1px solid var(--glass-border);
}

.hero-host {
    margin-top: -1.6rem;
    margin-bottom: 1.2rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #fff;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 20px rgba(61, 90, 254, 0.4);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(61, 90, 254, 0.6);
}

/* Sections */
section {
    padding: 6rem 2rem;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    background: linear-gradient(135deg, #fff, var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Cards & Glassmorphism */
.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 2.5rem;
    border-radius: 20px;
    transition: transform 0.3s ease, border-color 0.3s ease;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    text-align: left;
}

.glass-card:hover {
    border-color: rgba(61, 90, 254, 0.3);
    background: var(--glass-highlight);
}

#about p {
    margin-bottom: 1.5rem;
    color: #cbd5e1;
    font-size: 1.05rem;
}

#about p:last-child {
    margin-bottom: 0;
}

.concept-link {
    color: var(--accent-secondary);
    text-decoration: underline;
    text-underline-offset: 3px;
    font-weight: 600;
    transition: opacity 0.2s ease;
}

.concept-link:hover {
    opacity: 0.8;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.feature-card h4 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    color: var(--accent-secondary);
    margin-bottom: 1rem;
}

.tba-card {
    text-align: center;
    padding: 4rem 2rem;
    border-style: dashed;
    border-color: var(--glass-border);
    margin-bottom: 2rem;
}

.tba-content h3 {
    font-family: var(--font-heading);
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.organizers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.organizer-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.contact-info {
    text-align: center;
    margin-top: 2rem;
}

.contact-info h4 {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

footer {
    text-align: center;
    padding: 3rem 1rem;
    background: #05060a;
    color: #555;
    font-size: 0.9rem;
}

/* Utilities */
.mt-4 {
    margin-top: 1.5rem;
}

.small-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 1rem;
}

/* Animations */
.fade-in-up {
    animation: fadeInUp 1s ease-out forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-observe {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in-observe.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsiveness */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    h1 {
        font-size: 2.5rem;
    }

    .hero-content {
        width: 100%;
    }

    .card {
        padding: 1.5rem;
    }
}

/* Added Styles for Enhanced Features */
.section-subtitle {
    font-family: var(--font-heading);
    font-size: 2rem;
    text-align: center;
    margin-bottom: 2rem;
    margin-top: 3rem;
    background: linear-gradient(135deg, #fff, var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.feature-card {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.feature-desc {
    font-weight: 700;
    color: var(--accent-secondary);
    margin-bottom: 0.8rem;
    font-size: 1.05rem;
    letter-spacing: 0.5px;
}

.feature-card p:last-child {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-top: auto;
}

/* Recent Updates Section */
#updates {
    padding: 0rem 2rem;
}

#updates .section-title {
    margin-bottom: 2rem;
}

.updates-scroll {
    max-width: 800px;
    margin: 0 auto;
    height: 150px;
    overflow-y: scroll;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 15px;
    padding: 1.5rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.updates-scroll::-webkit-scrollbar {
    width: 6px;
}

.updates-scroll::-webkit-scrollbar-track {
    background: transparent;
}

.updates-scroll::-webkit-scrollbar-thumb {
    background: rgba(0, 229, 255, 0.4);
    border-radius: 3px;
}

.updates-scroll::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 229, 255, 0.6);
}

.update-item {
    display: flex;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    align-items: flex-start;
}

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

.update-date {
    font-family: var(--font-heading);
    color: var(--accent-secondary);
    font-weight: 600;
    font-size: 0.85rem;
    white-space: nowrap;
    flex-shrink: 0;
}

.update-content {
    color: #cbd5e1;
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Schedule Section */
.schedule-card {
    padding: 2rem;
    border-style: solid;
}

.schedule-title {
    text-align: center;
    margin-bottom: 1.5rem;
}

.schedule-title h3 {
    font-family: var(--font-heading);
    font-size: 2rem;
    margin-bottom: 0.4rem;
    color: var(--text-secondary);
    text-align: center;
}

.schedule-note {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.schedule-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.schedule-day {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    padding: 1rem;
}

.schedule-day h4 {
    font-family: var(--font-heading);
    font-size: 1rem;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 1rem;
    padding-bottom: 0.6rem;
    border-bottom: 1px solid rgba(0, 229, 255, 0.3);
}

.day-label {
    color: var(--accent-secondary);
    font-weight: 700;
    letter-spacing: 0.2px;
}

.day-date {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.schedule-list {
    display: flex;
    flex-direction: column;
}

.schedule-item {
    display: grid;
    grid-template-columns: 108px 1fr;
    gap: 0.75rem;
    padding: 0.55rem 0;
    align-items: flex-start;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.09);
}

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

.schedule-time {
    font-family: var(--font-heading);
    color: var(--accent-secondary);
    font-weight: 700;
    font-size: 0.86rem;
    white-space: nowrap;
    flex-shrink: 0;
}

.schedule-content {
    color: #cbd5e1;
    font-size: 0.9rem;
    line-height: 1.45;
}

.lecture-info-card {
    padding: 2rem;
    margin-bottom: 2rem;
}

.lecture-block-title {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 1.2rem;
}

.lecture-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.lecture-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    padding: 1rem;
}

.lecture-top {
    display: grid;
    grid-template-columns: 1fr 220px;
    gap: 1rem;
    align-items: start;
    margin-bottom: 0.8rem;
}

.lecture-head {
    min-width: 0;
}

.lecture-name-row {
    display: flex;
    justify-content: flex-start;
    align-items: baseline;
    gap: 0.35rem;
}

.lecture-name {
    font-family: var(--font-heading);
    color: var(--accent-secondary);
    font-size: 1.1rem;
    margin-bottom: 0;
}

.lecture-hp-link {
    color: #ffffff;
    text-decoration: underline;
    text-underline-offset: 2px;
    font-size: 0.9rem;
    white-space: nowrap;
}

.lecture-hp-link:hover {
    opacity: 0.85;
}

.lecture-item p {
    color: #cbd5e1;
    font-size: 0.95rem;
    margin-bottom: 0.7rem;
    line-height: 1.65;
}

.abstract-block {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    padding: 0.75rem 0.85rem;
    margin-bottom: 0.8rem;
}

.abstract-label {
    font-family: var(--font-heading);
    color: var(--accent-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.35rem;
}

.abstract-text {
    margin: 0;
    max-height: none;
    overflow-y: visible;
    line-height: 1.8;
    white-space: normal;
}

.lecture-photo {
    width: 100%;
    max-width: 220px;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border-radius: 10px;
    border: 1px solid var(--glass-border);
    margin: 0;
    background: rgba(255, 255, 255, 0.03);
    justify-self: end;
}

#hero-gallery {
    padding-top: 1rem;
}

.hero-gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.hero-gallery-item {
    margin: 0;
    padding: 0.8rem;
}

.hero-gallery-item img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    display: block;
}

#faq {
    padding-top: 2rem;
}

.faq-list {
    display: grid;
    gap: 1rem;
}

.faq-item {
    padding: 1.2rem 1.4rem;
}

.faq-item summary {
    cursor: pointer;
    font-family: var(--font-heading);
    color: var(--text-primary);
    font-size: 1.05rem;
    list-style: none;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::before {
    content: '+';
    color: var(--accent-secondary);
    margin-right: 0.6rem;
    font-weight: 700;
}

.faq-item[open] summary::before {
    content: '-';
}

.faq-item p {
    margin-top: 0.8rem;
    color: #cbd5e1;
    font-size: 0.95rem;
}

.organizers-grid-horizontal {
    grid-template-columns: 1fr;
}

@media (max-width: 768px) {
    .schedule-grid {
        grid-template-columns: 1fr;
        gap: 0.9rem;
    }

    .schedule-item {
        grid-template-columns: 96px 1fr;
        gap: 0.65rem;
    }

    .hero-gallery-grid {
        grid-template-columns: 1fr;
    }

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

    .lecture-top {
        grid-template-columns: 1fr;
    }

    .lecture-photo {
        max-width: 100%;
        justify-self: start;
        margin-top: 0.3rem;
    }

    .lecture-name-row {
        align-items: flex-start;
        flex-wrap: wrap;
    }

    .organizers-grid-horizontal {
        grid-template-columns: 1fr;
    }
}