:root {
    --primary-green: #00d084;
    --dark-green: #00a066;
    --light-green: #00ff9f;
    --primary-black: #0a0a0a;
    --dark-gray: #1a1a1a;
    --medium-gray: #2a2a2a;
    --light-gray: #3a3a3a;
    --text-light: #e0e0e0;
    --text-white: #ffffff;
    --accent-green: #00ff88;
    --shadow-green: rgba(0, 208, 132, 0.3);
    --transition-speed: 0.3s;
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    background-color: var(--primary-black);
    color: var(--text-light);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-width: 320px;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

::selection {
    background-color: var(--primary-green);
    color: var(--primary-black);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
    box-sizing: border-box;
}

.navbar {
    background-color: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-speed) var(--transition-smooth);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.navbar.scrolled {
    padding: 0.75rem 0;
    background-color: rgba(10, 10, 10, 0.98);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

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

.nav-logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.nav-logo img {
    height: 50px;
    width: auto;
    transition: opacity 0.3s ease;
}

.nav-logo a:hover img {
    opacity: 0.8;
}

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

.nav-menu a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--transition-speed) var(--transition-smooth);
    position: relative;
    padding: 0.5rem 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-menu a:hover {
    color: var(--primary-green);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-green), var(--light-green));
    transition: width var(--transition-speed) var(--transition-smooth);
}

.nav-menu a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

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

.hero {
    min-height: auto;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 120px;
    padding-bottom: 80px;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-black) 0%, var(--dark-gray) 50%, var(--primary-black) 100%);
    z-index: -2;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 50%, var(--shadow-green) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, var(--shadow-green) 0%, transparent 50%);
    opacity: 0.5;
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.6; }
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 208, 132, 0.03) 2px,
            rgba(0, 208, 132, 0.03) 4px
        );
    pointer-events: none;
}

.hero-content {
    z-index: 1;
}

.hero-main {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-logo {
    flex-shrink: 0;
}

.hero-logo img {
    width: 320px;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(0, 208, 132, 0.5));
    animation: float 4s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.hero-info {
    text-align: left;
}

.hero-text-wrapper {
    margin-bottom: 2rem;
}

.hero-subtitle {
    font-size: 0.9rem;
    color: var(--primary-green);
    font-weight: 600;
    letter-spacing: 1px;
    display: inline-block;
    margin-bottom: 1rem;
}

.hero-description {
    font-size: 2.2rem;
    color: var(--text-white);
    margin: 0 0 0.8rem 0;
    line-height: 1.3;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.hero-title-en {
    font-size: 1rem;
    color: var(--text-light);
    margin: 0;
    font-weight: 400;
    letter-spacing: 0.5px;
    opacity: 0.8;
}

.hero-dates {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
}

.date-card {
    background: linear-gradient(145deg, var(--dark-gray), var(--medium-gray));
    border: 1px solid rgba(0, 208, 132, 0.2);
    padding: 2.5rem;
    border-radius: 16px;
    transition: all var(--transition-speed) var(--transition-smooth);
    min-width: 320px;
    flex: 1;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    display: block;
    cursor: pointer;
}

.date-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--primary-green) 0%, transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-speed) ease;
    pointer-events: none;
}

.date-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--primary-green);
    box-shadow: 
        0 20px 40px rgba(0, 208, 132, 0.3),
        0 0 60px rgba(0, 208, 132, 0.1);
}

.date-card:hover::before {
    opacity: 0.1;
}

.date-card h3 {
    color: var(--primary-green);
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
}

.date-card .date {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 0.8rem;
    letter-spacing: -0.5px;
}

.date-card .venue {
    color: var(--text-light);
    font-size: 1rem;
    line-height: 1.5;
}

.date-card .time {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.5;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-green), var(--dark-green));
    color: var(--primary-black);
    padding: 1.2rem 3.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all var(--transition-speed) var(--transition-smooth);
    box-shadow:
        0 5px 20px rgba(0, 208, 132, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 1px;
    animation: shake 8s ease-in-out infinite;
}

@keyframes shake {
    0%, 95%, 100% {
        transform: translateX(0);
    }
    95.5% {
        transform: translateX(-3px);
    }
    96% {
        transform: translateX(3px);
    }
    96.5% {
        transform: translateX(-3px);
    }
    97% {
        transform: translateX(3px);
    }
    97.5% {
        transform: translateX(-2px);
    }
    98% {
        transform: translateX(2px);
    }
    98.5% {
        transform: translateX(-1px);
    }
    99% {
        transform: translateX(1px);
    }
    99.5% {
        transform: translateX(0);
    }
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

.cta-button:hover {
    background: linear-gradient(135deg, var(--light-green), var(--primary-green));
    transform: translateY(-3px) scale(1.05);
    box-shadow:
        0 15px 35px rgba(0, 208, 132, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    animation: none;
}

.cta-button:hover::before {
    left: 100%;
}

.section {
    padding: 100px 0;
}

.section:nth-child(even) {
    position: relative;
}

.section:nth-child(even)::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0, 208, 132, 0.03), transparent),
        radial-gradient(circle at 80% 50%, rgba(0, 208, 132, 0.03), transparent);
    pointer-events: none;
}

.news {
    background-color: var(--primary-black);
}

.register-link-top {
    text-align: center;
    margin-bottom: 3rem;
    padding-top: 0.5rem;
}

.news-list {
    max-width: 800px;
    margin: 0 auto;
}

.news-item {
    background: linear-gradient(145deg, var(--dark-gray), var(--medium-gray));
    border: 1px solid rgba(0, 208, 132, 0.1);
    border-radius: 12px;
    padding: 1.5rem 2rem;
    margin-bottom: 1.5rem;
    transition: all var(--transition-speed) var(--transition-smooth);
}

.news-item:hover {
    transform: translateY(-3px);
    border-color: var(--primary-green);
    box-shadow: 0 10px 30px rgba(0, 208, 132, 0.2);
}

.news-date {
    font-size: 0.9rem;
    color: var(--primary-green);
    font-weight: 600;
    display: block;
    margin-bottom: 0.5rem;
}

.news-title {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 600;
}

.news-title a {
    color: var(--text-white);
    text-decoration: none;
    display: inline;
    transition: color var(--transition-speed) ease;
}

.news-title a:hover {
    color: var(--primary-green);
}

.news-link {
    color: var(--primary-green);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-speed) ease;
    padding: 0 0.3rem;
}

.news-link:hover {
    color: var(--light-green);
    text-decoration: underline;
}

.news-link-icon {
    font-size: 1.2rem;
    margin-left: 1rem;
    transition: transform var(--transition-speed) ease;
}

.news-item:hover .news-link-icon {
    transform: translateX(5px);
}

.section-title {
    font-size: 3.5rem;
    text-align: center;
    margin-bottom: 4rem;
    background: linear-gradient(135deg, var(--primary-green), var(--light-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    letter-spacing: -1px;
    position: relative;
    display: inline-block;
    width: 100%;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary-green), transparent);
}

.about {
    background-color: var(--dark-gray);
}

.about-lead {
    font-size: 1.45rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    max-width: 880px;
    margin: 0 auto 2.5rem;
    text-align: center;
    color: #f5f5f5;
}

.about-content {
    max-width: 920px;
    margin: 0 auto;
    padding: 2.75rem 3rem;
    background: linear-gradient(135deg, rgba(32, 32, 32, 0.9), rgba(12, 12, 12, 0.85));
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
    backdrop-filter: blur(12px);
}

.about-content p {
    font-size: 1.2rem;
    line-height: 1.9;
    margin: 0;
    color: rgba(240, 240, 240, 0.92);
    text-align: left;
}

.about-content p.venue-images-note {
    font-size: 0.8rem;
    color: rgba(224, 224, 224, 0.4);
    margin: 0.6rem 0 0 0;
    font-weight: 400;
    text-align: center;
}

 .feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    max-width: 1100px;
    width: 100%;
    margin: 0 auto;
}

.feature-card {
    background: linear-gradient(145deg, var(--medium-gray), var(--dark-gray));
    padding: 2.5rem;
    border-radius: 20px;
    text-align: center;
    transition: all var(--transition-speed) var(--transition-smooth);
    border: 1px solid rgba(255, 255, 255, 0.05);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, transparent, rgba(0, 208, 132, 0.1));
    opacity: 0;
    transition: opacity var(--transition-speed) ease;
}

.feature-card:hover {
    transform: translateY(-10px) scale(1.03);
    border-color: rgba(0, 208, 132, 0.3);
    box-shadow: 
        0 20px 40px rgba(0, 208, 132, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--primary-green);
    margin-bottom: 1rem;
}

.venues {
    background-color: var(--primary-black);
}

.venue-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.venue-card {
    background: 
        linear-gradient(145deg, rgba(26, 26, 26, 0.8), rgba(42, 42, 42, 0.8)),
        radial-gradient(circle at top right, rgba(0, 208, 132, 0.1), transparent);
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid rgba(0, 208, 132, 0.15);
    transition: all var(--transition-speed) var(--transition-smooth);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.venue-card::before {
    content: '';
    position: absolute;
    top: -100%;
    left: -100%;
    width: 300%;
    height: 300%;
    background: radial-gradient(circle, rgba(0, 208, 132, 0.1) 0%, transparent 70%);
    transition: transform 0.6s ease;
    transform: rotate(45deg);
}

.venue-card:hover {
    border-color: var(--primary-green);
    box-shadow: 
        0 15px 35px rgba(0, 208, 132, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transform: translateY(-5px);
}

.venue-card:hover::before {
    transform: rotate(45deg) translate(50%, 50%);
}

.venue-card h3 {
    color: var(--primary-green);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.venue-info p {
    margin-bottom: 0.5rem;
}

.venue-date {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-white);
}

.venue-time {
    color: var(--primary-green);
}

.venue-link {
    display: inline-block;
    margin-top: 1.5rem;
    color: var(--primary-green);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-speed) var(--transition-smooth);
    position: relative;
    padding: 0.5rem 0;
}

.venue-link:hover {
    color: var(--light-green);
    transform: translateX(5px);
}

.venue-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-green);
    transition: width var(--transition-speed) var(--transition-smooth);
}

.venue-link:hover::after {
    width: 100%;
}

.schedule-links {
    text-align: center;
    padding: 2rem;
}

.schedule-links > p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: var(--text-light);
}

.venue-links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto 2rem;
}

.venue-schedule-link {
    display: block;
    background: linear-gradient(145deg, var(--medium-gray), var(--dark-gray));
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid rgba(0, 208, 132, 0.2);
    text-decoration: none;
    transition: all var(--transition-speed) var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.venue-schedule-link::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 208, 132, 0.1) 0%, transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-speed) ease;
}

.venue-schedule-link:hover {
    transform: translateY(-8px);
    border-color: var(--primary-green);
    box-shadow: 0 15px 35px rgba(0, 208, 132, 0.3);
}

.venue-schedule-link:hover::before {
    opacity: 1;
}

.venue-schedule-link h3 {
    color: var(--primary-green);
    margin-bottom: 0.8rem;
    font-size: 1.5rem;
    transition: color var(--transition-speed) ease;
}

.venue-schedule-link:hover h3 {
    color: var(--light-green);
}

.schedule-date {
    color: var(--text-light);
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.schedule-action {
    color: var(--primary-green);
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-speed) ease;
}

.venue-schedule-link:hover .schedule-action {
    color: var(--light-green);
    transform: translateX(5px);
}

.schedule-note {
    font-size: 1rem;
    color: var(--text-light);
    margin-top: 2rem;
    line-height: 1.8;
}

.exhibitors {
    background: linear-gradient(180deg, var(--dark-gray) 0%, var(--medium-gray) 100%);
    position: relative;
}

.exhibitors::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 50%, rgba(0, 208, 132, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 70% 70%, rgba(0, 208, 132, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.sponsor-tier {
    margin-bottom: 4rem;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.tier-title {
    text-align: center;
    margin-bottom: 2.5rem;
    font-size: 1.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    position: relative;
    padding-bottom: 1rem;
}

.order-note {
    font-size: 0.8rem;
    font-weight: 400;
    color: #999;
    letter-spacing: normal;
    margin-left: 10px;
    text-transform: none;
}

.tier-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    height: 3px;
    border-radius: 2px;
}

.tier-title.platinum {
    background: linear-gradient(135deg, #e5e4e2 0%, #f0f0f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tier-title.platinum::after {
    width: 120px;
    background: linear-gradient(90deg, #e5e4e2, #f0f0f0);
}

.tier-title.pearl {
    background: linear-gradient(135deg, #f8f8ff 0%, #e6e6fa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tier-title.pearl::after {
    width: 100px;
    background: linear-gradient(90deg, #f8f8ff, #e6e6fa);
}

.tier-title.gold {
    background: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tier-title.gold::after {
    width: 80px;
    background: linear-gradient(90deg, #ffd700, #ffed4e);
}

.tier-title.silver {
    background: linear-gradient(135deg, #c0c0c0 0%, #e8e8e8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tier-title.silver::after {
    width: 80px;
    background: linear-gradient(90deg, #c0c0c0, #e8e8e8);
}

.tier-title.logo {
    background: linear-gradient(135deg, #00d084 0%, #00f5a0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tier-title.logo::after {
    width: 80px;
    background: linear-gradient(90deg, #00d084, #00f5a0);
}

.tier-title.media {
    background: linear-gradient(135deg, #00d084 0%, #00f5a0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tier-title.media::after {
    width: 80px;
    background: linear-gradient(90deg, #00d084, #00f5a0);
}

.sponsor-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    padding: 2rem 0;
    justify-content: center;
}

.platinum-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
    justify-content: center;
}


.pearl-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
    justify-content: center;
}

.gold-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    max-width: 1100px;
    margin: 0 auto;
    justify-content: center;
}

.silver-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    justify-content: center;
}

.logo-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    justify-content: center;
}

.media-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    justify-content: center;
}

.sponsor-card {
    background-color: #ffffff;
    border-radius: 16px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    text-decoration: none;
    color: inherit;
}

.platinum-card {
    padding: 2.8rem;
    min-height: 190px;
    width: 320px;
    border: 1px solid rgba(229, 228, 226, 0.2);
}

.platinum-card::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, #e5e4e2, #f0f0f0, #e5e4e2);
    z-index: -1;
    opacity: 0.5;
    border-radius: 16px;
}

.pearl-card {
    padding: 3.5rem;
    min-height: 240px;
    width: 400px;
    background: linear-gradient(135deg, #ffffff 0%, #f8f8ff 100%);
    border: 2px solid rgba(230, 230, 250, 0.3);
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.1);
}

.gold-card {
    padding: 2.8rem;
    min-height: 190px;
    width: 320px;
    border: 1px solid rgba(255, 215, 0, 0.2);
}

.silver-card {
    padding: 2rem;
    min-height: 160px;
    width: 250px;
}

.logo-card {
    padding: 2rem;
    min-height: 160px;
    width: 250px;
}

.media-card {
    padding: 2rem;
    min-height: 160px;
    width: 250px;
}

.sponsor-card:hover {
    transform: translateY(-8px);
}

.platinum-card:hover {
    box-shadow: 0 12px 40px rgba(229, 228, 226, 0.4);
    transform: translateY(-10px) scale(1.02);
}

.pearl-card:hover {
    box-shadow: 0 10px 32px rgba(230, 230, 250, 0.4);
    transform: translateY(-8px) scale(1.01);
}

.gold-card:hover {
    box-shadow: 0 8px 24px rgba(255, 215, 0, 0.25);
    border-color: rgba(255, 215, 0, 0.4);
}

.silver-card:hover {
    box-shadow: 0 8px 24px rgba(192, 192, 192, 0.25);
    border-color: rgba(192, 192, 192, 0.4);
}

.logo-card {
    padding: 2rem;
    min-height: 160px;
    width: 250px;
}

.logo-card:hover {
    box-shadow: 0 8px 24px rgba(0, 208, 132, 0.25);
    border-color: rgba(0, 208, 132, 0.4);
}

.media-card {
    padding: 2rem;
    min-height: 160px;
    width: 250px;
}

.media-card:hover {
    box-shadow: 0 8px 24px rgba(0, 208, 132, 0.25);
    border-color: rgba(0, 208, 132, 0.4);
}

.sponsor-logo {
    font-weight: 600;
    color: #333333;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.platinum-card .sponsor-logo img {
    max-height: 150px;
}

.pearl-card .sponsor-logo img {
    max-height: 120px;
}

.assethub-card {
    background: #ffffff;
}

.gold-card .sponsor-logo img {
    max-height: 100px;
}

.silver-card .sponsor-logo img {
    max-height: 80px;
}

.logo-card .sponsor-logo img {
    max-height: 80px;
}

.media-card .sponsor-logo img {
    max-height: 80px;
}

.committee-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
    justify-content: center;
}

.committee-card {
    padding: 2.8rem;
    min-height: 190px;
    width: 320px;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.committee-card .sponsor-logo img {
    max-height: 100px;
}

.tier-title.committee {
    color: #666;
    font-size: 1.8rem;
}

.tier-title.committee::after {
    width: 100px;
    background: linear-gradient(90deg, #666, #999);
}

.schedule {
    background-color: var(--primary-black);
}

.schedule-timeline {
    max-width: 800px;
    margin: 0 auto;
}

.timeline-item {
    display: flex;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: var(--dark-gray);
    border-radius: 10px;
    border-left: 3px solid var(--primary-green);
    transition: all 0.3s ease;
}

.timeline-item:hover {
    transform: translateX(10px);
    box-shadow: 0 5px 20px var(--shadow-green);
}

.timeline-item .time {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-green);
    margin-right: 2rem;
    min-width: 80px;
}

.timeline-item h4 {
    color: var(--text-white);
    margin-bottom: 0.5rem;
}

.register {
    background-color: var(--dark-gray);
    text-align: center;
}

.register-content p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.register-content .cta-button {
    margin: 2rem 0;
}

.after-party-button {
    background: linear-gradient(135deg, #ff6b6b, #ee5a6f);
    box-shadow:
        0 5px 20px rgba(255, 107, 107, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    animation: shake 8s ease-in-out infinite;
}

.after-party-button:hover {
    background: linear-gradient(135deg, #ff8787, #ff6b6b);
    box-shadow:
        0 10px 40px rgba(255, 107, 107, 0.6),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.register-note {
    font-size: 1rem !important;
    color: rgba(224, 224, 224, 0.7);
    margin-top: 2rem !important;
    margin-bottom: 1rem !important;
}

.contact {
    background-color: var(--primary-black);
    text-align: center;
}

.contact-content p {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.footer {
    background: linear-gradient(to bottom, var(--dark-gray), var(--primary-black));
    padding: 4rem 0 2rem;
    border-top: 1px solid rgba(0, 208, 132, 0.2);
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-green), transparent);
    animation: glow 3s ease-in-out infinite;
}

@keyframes glow {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    color: var(--primary-green);
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--primary-green);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--light-gray);
    color: var(--text-light);
}

.footer-bottom a {
    color: var(--primary-green);
    text-decoration: none;
    transition: color var(--transition-speed) ease;
}

.footer-bottom a:hover {
    color: var(--light-green);
    text-decoration: underline;
}

.fade-in {
    animation: fadeInUp 1s var(--transition-smooth) forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 演出は .animate-in にだけ適用する */
.animate-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* JSやIO非対応時は普通に表示 */
.no-io .animate-in {
    opacity: 1;
    transform: none;
}

.coming-soon {
    text-align: center;
    padding: 4rem;
    background: 
        linear-gradient(145deg, var(--medium-gray), var(--dark-gray)),
        radial-gradient(circle at 50% 50%, rgba(0, 208, 132, 0.05), transparent);
    border-radius: 20px;
    border: 1px solid rgba(0, 208, 132, 0.2);
    position: relative;
    overflow: hidden;
}

.coming-soon::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, var(--primary-green), transparent, var(--primary-green));
    border-radius: 20px;
    opacity: 0;
    z-index: -1;
    transition: opacity 0.3s ease;
}

.coming-soon:hover::before {
    opacity: 0.1;
}

.coming-soon h3 {
    font-size: 2.5rem;
    color: var(--primary-green);
    margin-bottom: 1.5rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.coming-soon p {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
    line-height: 1.8;
}

.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-black);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 3px solid rgba(0, 208, 132, 0.1);
    border-top-color: var(--primary-green);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero-logo img {
        width: 180px;
    }

    .hero-description {
        font-size: 1.2rem;
    }

    .date-card {
        padding: 1.5rem;
    }

    /* スマ�Eでは全てのカードを統一 */
    .sponsor-card {
        padding: 2rem !important;
        width: 100% !important;
        min-height: 150px !important;
        max-width: none !important;
    }

    .platinum-card,
    .pearl-card,
    .gold-card,
    .silver-card,
    .committee-card,
    .media-card,
    .logo-card {
        padding: 2rem !important;
        width: 100% !important;
        min-height: 150px !important;
        max-width: none !important;
    }

    .sponsor-grid,
    .platinum-grid,
    .pearl-grid,
    .gold-grid,
    .silver-grid,
    .logo-grid,
    .media-grid,
    .committee-grid {
        gap: 1rem !important;
        flex-direction: column !important;
        align-items: stretch !important;
        width: 100% !important;
        max-width: none !important;
        padding: 0 !important;
    }

    .tier-title {
        font-size: 1.2rem;
    }

    /* スマ�Eでは全スポンサーロゴを統一サイズに */
    .platinum-card .sponsor-logo img,
    .pearl-card .sponsor-logo img,
    .gold-card .sponsor-logo img,
    .silver-card .sponsor-logo img,
    .committee-card .sponsor-logo img,
    .media-card .sponsor-logo img,
    .logo-card .sponsor-logo img {
        max-height: 60px !important;
        width: auto !important;
    }
}

@media (max-width: 767px) {
    .hero-main {
        flex-direction: column;
        gap: 2rem;
    }
    
    .hero-info {
        text-align: center;
    }
    
    .hero-subtitle {
        font-size: 0.85rem;
        margin-bottom: 0.8rem;
    }
    
    .hero-description {
        font-size: 1.5rem;
        margin-bottom: 0.6rem;
    }
    
    .hero-title-en {
        font-size: 0.9rem;
    }
    
    .hero-dates {
        justify-content: center;
    }
    
    .hero-logo img {
        width: 220px;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        right: -100%;
        width: 250px;
        height: calc(100vh - 70px);
        background-color: var(--dark-gray);
        flex-direction: column;
        padding: 2rem;
        transition: right 0.3s ease;
        border-left: 1px solid var(--light-gray);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }
    
    .section-title {
        font-size: 2.5rem;
        margin-bottom: 3rem;
    }
    
    .section-title::after {
        bottom: -15px;
        width: 80px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .about-lead {
        font-size: 1.25rem;
        margin-bottom: 2rem;
    }

    .about-content {
        padding: 2.2rem 1.8rem;
        gap: 1.5rem;
    }

    .about-content p {
        font-size: 1.1rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .feature-card {
        padding: 2rem;
    }
    
    .venue-card {
        padding: 2rem;
    }
    
    .coming-soon {
        padding: 3rem 2rem;
    }
    
    .coming-soon h3 {
        font-size: 2rem;
    }
    
    .coming-soon p {
        font-size: 1.1rem;
    }
    
    .cta-button {
        padding: 1rem 2.5rem;
        font-size: 1rem;
    }
    
    .hero-dates {
        flex-direction: column;
        align-items: center;
    }
    
    .date-card {
        width: 100%;
        max-width: 300px;
    }
    
    .venue-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline-item {
        flex-direction: column;
    }
    
    .timeline-item .time {
        margin-bottom: 0.5rem;
    }
    
    .sponsor-tier {
        margin-bottom: 3rem;
    }
    
    .tier-title {
        font-size: 1.4rem;
        margin-bottom: 2rem;
    }

    .platinum-grid {
        grid-template-columns: 1fr;
        width: 100%;
        padding: 0 1rem;
    }
    
    .pearl-grid {
        grid-template-columns: 1fr;
        padding: 0 1rem;
    }

    .gold-grid {
        grid-template-columns: 1fr;
        padding: 0 1rem;
    }

    .silver-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 0 1rem;
    }

    .committee-grid {
        flex-direction: column;
        align-items: stretch;
        padding: 0 1rem;
        width: 100%;
        max-width: 100%;
    }

    .logo-grid {
        flex-direction: column;
        align-items: stretch;
        padding: 0 1rem;
        width: 100%;
        max-width: 100%;
    }

    .media-grid {
        flex-direction: column;
        align-items: stretch;
        padding: 0 1rem;
        width: 100%;
        max-width: 100%;
    }

    /* スマホでは全てのカードを統一サイズに */
    .platinum-card,
    .pearl-card,
    .gold-card,
    .silver-card,
    .committee-card,
    .media-card,
    .logo-card {
        padding: 2rem 1.5rem;
        min-height: 140px;
        width: 100%;
        max-width: none;
    }

    /* スマホでは全てのロゴを統一サイズに */
    .platinum-card .sponsor-logo img,
    .pearl-card .sponsor-logo img,
    .gold-card .sponsor-logo img,
    .silver-card .sponsor-logo img,
    .committee-card .sponsor-logo img,
    .media-card .sponsor-logo img,
    .logo-card .sponsor-logo img {
        max-height: 80px;
        width: auto;
        max-width: 100%;
    }
}

@media (min-width: 1024px) {
    .platinum-card {
        width: 420px;
        padding: 3.5rem;
        min-height: 240px;
    }

    .platinum-card .sponsor-logo img {
        max-height: 225px;
    }
}

@media (min-width: 1600px) {
    .container {
        max-width: 1600px;
        padding: 0 60px;
    }
    
    .hero-main {
        gap: 6rem;
    }
    
    .hero-logo img {
        width: 360px;
    }
    
    .hero-description {
        font-size: 2.5rem;
    }
    
    .hero-title-en {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 4rem;
    }
    
    .date-card {
        padding: 3rem;
    }
    
    .date-card .date {
        font-size: 2rem;
    }
    
    .features {
        gap: 4rem;
    }
    
    .feature-card {
        padding: 3rem;
    }
    
    .about-content p {
        font-size: 1.3rem;
    }

    .about-content {
        padding: 3.25rem 3.5rem;
        gap: 2rem;
    }
}

@media (min-width: 1920px) {
    .container {
        max-width: 1800px;
        padding: 0 80px;
    }
    
    .hero-main {
        gap: 8rem;
    }
    
    .hero-logo img {
        width: 400px;
    }
    
    .hero-description {
        font-size: 2.8rem;
    }
    
    .hero-dates {
        gap: 3rem;
    }
    
    .date-card {
        min-width: 360px;
    }
}

/* 会場イメージギャラリー */
.venue-images-wrapper {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.venue-images-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.9rem;
    max-width: 742px;
    margin: 0 auto;
}

.venue-images-grid img {
    width: 100%;
    height: auto;
    border-radius: 4px;
    transition: all var(--transition-speed) var(--transition-smooth);
    border: 1px solid rgba(0, 208, 132, 0.15);
    opacity: 0.85;
}

.venue-images-grid img:hover {
    transform: scale(1.03);
    opacity: 1;
    box-shadow: 0 4px 12px rgba(0, 208, 132, 0.2);
    border-color: var(--primary-green);
}

.venue-images-note {
    font-size: 0.8rem;
    color: rgba(224, 224, 224, 0.4);
    margin: 0.6rem 0 0 0;
    font-weight: 400;
    text-align: center;
}

@media (max-width: 767px) {
    .venue-images-grid {
        max-width: 578px;
        gap: 0.8rem;
    }
}

@media (max-width: 480px) {
    .venue-images-grid {
        max-width: 462px;
        gap: 0.7rem;
    }
}

/* 今年の注目セッション */
.featured-sessions {
    background-color: var(--primary-black);
}

.featured-sessions-slider {
    overflow-x: auto;
    overflow-y: hidden;
    position: relative;
    width: 100%;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
}

.featured-sessions-slider::-webkit-scrollbar {
    height: 8px;
}

.featured-sessions-slider::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

.featured-sessions-slider::-webkit-scrollbar-thumb {
    background: var(--primary-green);
    border-radius: 4px;
}

.featured-sessions-slider::-webkit-scrollbar-thumb:hover {
    background: #00f5a0;
}

.featured-sessions-track {
    display: flex;
    gap: 2.5rem;
    animation: slideLeft 30s linear infinite;
    width: max-content;
    padding-bottom: 1rem;
}

.featured-sessions-track:hover,
.featured-sessions-slider:hover .featured-sessions-track {
    animation-play-state: paused;
}

@keyframes slideLeft {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

/* 旧グリッドスタイル（互換性のため残す） */
.featured-sessions-grid {
    display: flex;
    gap: 2.5rem;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 1rem;
    max-width: 100%;
}

.featured-sessions-grid::-webkit-scrollbar {
    height: 8px;
}

.featured-sessions-grid::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

.featured-sessions-grid::-webkit-scrollbar-thumb {
    background: var(--primary-green);
    border-radius: 4px;
}

.featured-sessions-grid::-webkit-scrollbar-thumb:hover {
    background: #00f5a0;
}

.featured-session-card {
    background: linear-gradient(145deg, var(--dark-gray), var(--medium-gray));
    border: 1px solid rgba(0, 208, 132, 0.2);
    border-radius: 16px;
    overflow: hidden;
    transition: all var(--transition-speed) var(--transition-smooth);
    text-decoration: none;
    display: flex;
    flex-direction: column;
    position: relative;
    width: 400px;
    min-width: 400px;
    max-width: 400px;
    flex-shrink: 0;
    scroll-snap-align: start;
}

.featured-session-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, transparent, rgba(0, 208, 132, 0.05));
    opacity: 0;
    transition: opacity var(--transition-speed) ease;
    pointer-events: none;
}

.featured-session-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-green);
    box-shadow: 0 20px 40px rgba(0, 208, 132, 0.3);
}

.featured-session-card:hover::before {
    opacity: 1;
}

.featured-session-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
    position: relative;
}

.featured-session-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s var(--transition-smooth);
}

.featured-session-card:hover .featured-session-image img {
    transform: scale(1.05);
}

.featured-session-content {
    padding: 2rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.featured-session-title {
    font-size: 1.3rem;
    line-height: 1.6;
    color: var(--text-white);
    margin: 0;
    font-weight: 600;
    transition: color var(--transition-speed) ease;
}

.featured-session-card:hover .featured-session-title {
    color: var(--primary-green);
}

@media (max-width: 767px) {
    .featured-sessions-grid {
        gap: 1.5rem;
        padding-right: 1rem;
    }

    .featured-session-card {
        width: 320px;
        min-width: 320px;
        max-width: 320px;
    }

    .featured-session-image {
        height: 200px;
    }

    .featured-session-content {
        padding: 1.5rem;
    }

    .featured-session-title {
        font-size: 1.1rem;
    }
}