/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

main {
    padding-top: 80px;
}

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

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: background-color 0.3s ease;
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2563eb;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #2563eb;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: #333;
    transition: all 0.3s ease;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 900px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 120%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23ffffff" fill-opacity="0.1" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,133.3C672,139,768,181,864,181.3C960,181,1056,139,1152,128C1248,117,1344,139,1392,149.3L1440,160L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') center/cover no-repeat;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    color: white;
    max-width: 1200px;
    padding: 0 20px;
}

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

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 3rem;
    opacity: 0.9;
}

.hero-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 2rem;
}

.detail-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: #fff;
}

.detail-item p {
    font-size: 1.3rem;
    font-weight: 500;
    color: #f8fafc;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

/* News Section */
.news {
    padding: 5rem 0;
    background-color: #f8fafc;
}

.news h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1e293b;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.news-item {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.news-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.news-item time {
    color: #6b7280;
    font-size: 0.9rem;
    font-weight: 500;
}

.news-item h3 {
    margin: 0.5rem 0 1rem;
    color: #1e293b;
    font-size: 1.2rem;
}

.news-item p {
    color: #64748b;
    line-height: 1.7;
}

/* Schedule Section */
.schedule {
    padding: 5rem 0;
}

.schedule h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1e293b;
}

.schedule-grid {
    display: grid;
    gap: 1rem;
    max-width: 800px;
    margin: 0 auto;
}

.time-slot {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 2rem;
    align-items: center;
    padding: 1.5rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.time-slot:hover {
    transform: translateX(5px);
}

.time-slot time {
    font-weight: 600;
    color: #2563eb;
    font-size: 1rem;
}

.session h3 {
    color: #1e293b;
    margin-bottom: 0.5rem;
}

.session p {
    color: #64748b;
    font-size: 0.9rem;
}

/* Tickets Section */
.tickets {
    padding: 5rem 0;
    background-color: #f8fafc;
}

.tickets h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1e293b;
}

.ticket-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.ticket-card {
    background: white;
    border-radius: 20px;
    padding: 2.5rem 2rem;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

.ticket-card.featured {
    transform: scale(1.05);
    border: 3px solid #2563eb;
}

.ticket-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.ticket-card.featured:hover {
    transform: scale(1.05) translateY(-10px);
}

.ticket-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #1e293b;
}

.ticket-card .price {
    font-size: 2.5rem;
    font-weight: 700;
    color: #2563eb;
    margin-bottom: 1.5rem;
}

.ticket-card ul {
    list-style: none;
    margin-bottom: 1.5rem;
}

.ticket-card li {
    padding: 0.5rem 0;
    color: #64748b;
    position: relative;
}

.ticket-card li:before {
    content: "✓";
    color: #10b981;
    font-weight: bold;
    margin-right: 0.5rem;
}

.ticket-note {
    color: #ef4444;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    font-style: italic;
}

.ticket-button {
    background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    width: 100%;
    font-size: 1rem;
}

.ticket-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.4);
}

/* Sponsors Section */
.sponsors {
    padding: 5rem 0;
}

.sponsors h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1e293b;
}

.sponsor-tier {
    margin-bottom: 3rem;
}

.sponsor-tier h3 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: #374151;
}

.sponsor-grid {
    display: grid;
    gap: 2rem;
    justify-items: center;
    align-items: center;
}

.sponsor-grid.platinum {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.sponsor-grid.gold {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.sponsor-grid.silver {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.sponsor-logo {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    width: 100%;
    transition: transform 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sponsor-logo:hover {
    transform: translateY(-5px);
}

.placeholder-logo {
    color: #94a3b8;
    font-weight: 600;
    font-size: 1.2rem;
    text-align: center;
}

/* Footer */
.footer {
    background-color: #1e293b;
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
}

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

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

.footer-section a {
    color: #cbd5e1;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 1rem;
    text-align: center;
    color: #94a3b8;
}

/* Responsive Design */
@media (max-width: 768px) {
    main {
        padding-top: 70px;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 1rem 2rem;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
    }

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

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

    .hero-details {
        grid-template-columns: 1fr;
        padding: 1.5rem;
    }

    .time-slot {
        grid-template-columns: 1fr;
        gap: 1rem;
        text-align: center;
    }

    .time-slot time {
        font-size: 0.9rem;
    }

    .sponsor-grid.platinum,
    .sponsor-grid.gold,
    .sponsor-grid.silver {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    main {
        padding-top: 60px;
    }

    .container {
        padding: 0 15px;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .news h2,
    .schedule h2,
    .tickets h2,
    .sponsors h2 {
        font-size: 2rem;
    }

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

    .nav-container {
        padding: 1rem;
    }
}

/* Smooth animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.news-item,
.time-slot,
.ticket-card,
.sponsor-logo {
    animation: fadeInUp 0.6s ease-out;
}

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --text-primary: #f1f5f9;
        --text-secondary: #cbd5e1;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}