:root {
    --primary-color: #1e40af;
    --secondary-color: #3b82f6;
    --accent-color: #f59e0b;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Noto Sans JP', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* ヘッダー */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-white);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: all 0.3s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-list a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.cta-button {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: var(--shadow-md);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 4px;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-white);
    box-shadow: var(--shadow-lg);
    z-index: 999;
    transform: translateY(-100%);
    transition: transform 0.3s ease;
}

.mobile-menu.active {
    transform: translateY(0);
}

.mobile-menu ul {
    list-style: none;
    padding: 1rem 0;
}

.mobile-menu li {
    border-bottom: 1px solid var(--border-color);
}

.mobile-menu a {
    display: block;
    padding: 1rem 1.5rem;
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
}

.mobile-menu .mobile-cta {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    margin: 1rem 1.5rem;
    border-radius: 8px;
    text-align: center;
}

/* ヒーローセクション */
.hero {
    margin-top: 70px;
    background: #f9fafb;
    padding: 0;
    text-align: center;
}

.hero-banner-wrapper {
    max-width: 100%;
    animation: fadeInUp 1s ease;
}

.hero-banner-image {
    width: 100%;
    height: auto;
    display: block;
}

.hero-content {
    animation: fadeInUp 1s ease;
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-weight: 700;
    margin-bottom: 1.5rem;
    backdrop-filter: blur(10px);
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.hero-title .highlight {
    color: #fbbf24;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
}

.button {
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    display: inline-block;
}

.button-primary {
    background: linear-gradient(135deg, #f59e0b, #fbbf24);
    color: white;
    box-shadow: var(--shadow-lg);
}

.button-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.button-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid white;
    backdrop-filter: blur(10px);
}

.button-secondary:hover {
    background: white;
    color: var(--primary-color);
}

/* 緊急性訴求セクション */
.urgency {
    background: var(--bg-white);
    padding: 2rem 0;
    box-shadow: var(--shadow-md);
}

.urgency-content {
    display: flex;
    justify-content: space-around;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.urgency-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.urgency-icon {
    font-size: 2.5rem;
}

.urgency-text {
    display: flex;
    flex-direction: column;
}

.urgency-text strong {
    font-size: 1.1rem;
    color: var(--text-dark);
}

.urgency-text span {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* セクション */
.section {
    padding: 5rem 0;
}

.section-alt {
    background: var(--bg-light);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 900;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-dark);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    margin: 1rem auto 0;
    border-radius: 2px;
}

/* 開催概要 */
.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: center;
}

.about-main h3 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.about-main p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.highlight-item {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease;
}

.highlight-item:hover {
    transform: translateY(-5px);
}

.highlight-number {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--primary-color);
}

.highlight-label {
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: 500;
}

/* 価値提供 */
.value-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.value-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    text-align: center;
}

.value-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

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

.value-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.value-card p {
    color: var(--text-light);
    line-height: 1.6;
}

/* 対象者 */
.target-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.target-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.target-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
}

.target-icon {
    font-size: 2rem;
}

.target-text {
    font-weight: 500;
    color: var(--text-dark);
}

/* プログラム */
.program-timeline {
    max-width: 900px;
    margin: 0 auto;
}

.program-item {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 2rem;
    padding: 2rem;
    background: white;
    margin-bottom: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.program-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
}

.program-time {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.program-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.program-subtitle {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.program-speaker {
    font-size: 0.9rem;
    color: var(--accent-color);
    font-weight: 600;
}

.program-label {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 0.25rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.program-category {
    display: inline-block;
    background: var(--accent-color);
    color: white;
    padding: 0.25rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.program-highlight {
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    border-left: 4px solid var(--primary-color);
}

.program-break {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border-left: 4px solid var(--accent-color);
}

.program-section-header {
    margin: 2rem 0 1rem;
    padding: 1rem;
    background: var(--bg-light);
    border-radius: 8px;
}

.program-section-header h3 {
    font-size: 1.5rem;
    color: var(--text-dark);
    text-align: center;
}

.venue-only {
    background: linear-gradient(135deg, #f0fdf4, #dcfce7);
}

.venue-only-item {
    border-left: 4px solid var(--success-color);
}

/* 開催情報 */
.venue-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.venue-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    position: relative;
    transition: all 0.3s ease;
}

.venue-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* 品川会場の色（元のオンラインの色） */
.venue-physical {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    border: 2px solid var(--primary-color);
}

/* オンラインの色（元の品川会場の色） */
.venue-online {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border: 2px solid var(--accent-color);
}

.venue-badge {
    position: absolute;
    top: -12px;
    right: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.venue-type {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.venue-icon {
    font-size: 2.5rem;
}

.venue-type h3 {
    font-size: 1.75rem;
    color: var(--text-dark);
}

.venue-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.venue-detail strong {
    display: block;
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 0.25rem;
}

.venue-detail p,
.venue-detail a {
    font-size: 1rem;
    color: var(--text-dark);
}

.venue-detail a {
    text-decoration: underline;
}

.venue-detail ul {
    margin-left: 1.25rem;
    color: var(--text-dark);
}

/* 主催企業 */
#organizers {
    background: white;
}

.organizers-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1.5rem;
}

.organizer-card {
    background: white;
    padding: 2rem 1rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all 0.3s ease;
    text-decoration: none;
    display: block;
}

.organizer-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-5px);
}

.organizer-logo {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

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

.organizer-card h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.organizer-card p {
    font-size: 0.85rem;
    color: var(--text-light);
}

/* CTAセクション */
.cta-section {
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    color: white;
    padding: 5rem 0;
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.button-large {
    padding: 1.25rem 3rem;
    font-size: 1.25rem;
    background: #F9B114;
    color: white;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: none;
    display: inline-block;
}

.button-large:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(249, 177, 20, 0.3);
}

.cta-note {
    margin-top: 1rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* フッター */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 3rem 0;
}

.footer-content {
    text-align: center;
}

.footer-info h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.footer-info p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

/* トップへ戻るボタン */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

/* アニメーション */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease;
}

/* レスポンシブデザイン */
@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
    }

    .value-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .target-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .organizers-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

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

    .mobile-menu-toggle {
        display: flex;
    }

    .mobile-menu {
        display: block;
    }

    .hero {
        padding: 0;
    }

    .hero-banner-wrapper {
        margin-bottom: 0;
    }

    .hero-banner-image {
        border-radius: 0;
    }

    .hero-title {
        font-size: 1.75rem;
    }

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

    .hero-description {
        font-size: 0.95rem;
    }

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

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

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

    .program-item {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

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

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

    .urgency-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .pc-only {
        display: none;
    }
}

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

    .hero-banner-wrapper {
        margin-bottom: 0;
    }

    .section {
        padding: 3rem 0;
    }

    .button {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
}