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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans JP', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

img {
    max-width: 100%;
    height: auto;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* ===========================
   Variables
   =========================== */
:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --success-dark: #059669;
    --danger-color: #ef4444;
    --danger-dark: #dc2626;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f3f4f6;
    --bg-dark: #111827;
    --border-color: #e5e7eb;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Container */
    --container-max: 1200px;
    --container-padding: 1rem;
    
    /* Transitions */
    --transition-base: all 0.3s ease;
    
    /* Shadows */
    --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);
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
}

/* ===========================
   Container
   =========================== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition-base);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-md);
    padding-bottom: var(--space-md);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.navbar-brand h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.navbar-brand .tagline {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.navbar-toggler {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 30px;
    height: 30px;
    position: relative;
}

.navbar-toggler span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    position: absolute;
    left: 0;
    transition: var(--transition-base);
}

.navbar-toggler span:nth-child(1) {
    top: 6px;
}

.navbar-toggler span:nth-child(2) {
    top: 14px;
}

.navbar-toggler span:nth-child(3) {
    top: 22px;
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-link {
    font-weight: 500;
    color: var(--text-primary);
    transition: var(--transition-base);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
}

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

.nav-link.btn-login {
    background: var(--bg-secondary);
}

.nav-link.btn-register {
    background: var(--primary-color);
    color: white;
}

.nav-link.btn-register:hover {
    background: var(--primary-dark);
}

.nav-link.btn-contact {
    background: var(--secondary-color);
    color: white;
}

.nav-link.btn-contact:hover {
    background: #0ea068;
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-video-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1;
}

/* Fallback image styles */
.hero-fallback-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    z-index: 0;
}

/* Video loading state - 無効化 */
.hero-video.loading {
    opacity: 1; /* 常に表示 */
    transition: none;
}

.hero-video.loaded {
    opacity: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-lg);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: white;
    cursor: pointer;
    animation: bounce 2s infinite;
}

.scroll-icon {
    width: 30px;
    height: 50px;
    border: 2px solid white;
    border-radius: 25px;
    margin: 0 auto var(--space-sm);
    position: relative;
}

.scroll-icon::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    width: 6px;
    height: 6px;
    background: white;
    border-radius: 50%;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
}

.scroll-text {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@keyframes scroll {
    0% {
        transform: translateX(-50%) translateY(0);
        opacity: 0;
    }
    40% {
        opacity: 1;
    }
    80% {
        transform: translateX(-50%) translateY(20px);
        opacity: 0;
    }
    100% {
        opacity: 0;
    }
}

/* ===========================
   Section Styles
   =========================== */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-2xl);
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: var(--space-sm);
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
}

/* ===========================
   About Section
   =========================== */
.about {
    padding: var(--space-3xl) 0;
    background: var(--bg-secondary);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
}

.about-item {
    text-align: center;
    padding: var(--space-xl);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
}

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

.icon-wrapper {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
}

.about-item h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.about-item p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===========================
   Features Section
   =========================== */
.features {
    padding: var(--space-3xl) 0;
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
}

.feature-card {
    padding: var(--space-xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
}

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

.feature-icon {
    width: 60px;
    height: 60px;
    margin-bottom: var(--space-lg);
    background: var(--primary-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===========================
   Members Section
   =========================== */
.members {
    padding: var(--space-3xl) 0;
    background: var(--bg-secondary);
}

.member-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-3xl);
}

.stat {
    text-align: center;
    padding: var(--space-xl);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: var(--space-sm);
}

.stat p {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

.industries {
    text-align: center;
}

.industries h3 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--space-xl);
    color: var(--text-primary);
}

.industry-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    justify-content: center;
}

.tag {
    padding: var(--space-sm) var(--space-lg);
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition-base);
}

.tag:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

/* ===========================
   Events Section
   =========================== */
.events {
    padding: var(--space-3xl) 0;
    background: white;
}

.events-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
}

.event-card {
    padding: var(--space-xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition-base);
}

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

.event-date {
    display: inline-block;
    padding: var(--space-sm) var(--space-lg);
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
}

.event-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.event-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===========================
   Achievements Section
   =========================== */
.achievements {
    padding: var(--space-3xl) 0;
    background: var(--bg-secondary);
}

.achievement-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.achievement-item {
    padding: var(--space-xl);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition-base);
}

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

.achievement-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: var(--space-sm);
}

.achievement-label {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.achievement-sublabel {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.mobile-break {
    display: inline;
}

/* ===========================
   Contact Section
   =========================== */
.contact {
    padding: var(--space-3xl) 0;
    background: white;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: var(--space-lg);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.submit-button {
    width: 100%;
    padding: var(--space-md) var(--space-xl);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-base);
}

.submit-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* ===========================
   Footer
   =========================== */
.footer {
    padding: var(--space-2xl) 0 var(--space-lg);
    background: var(--bg-dark);
    color: white;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
}

.footer-info h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-xs);
}

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

.footer-links {
    display: flex;
    gap: var(--space-xl);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition-base);
}

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

.copyright {
    text-align: center;
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 768px) {
    /* Navigation */
    .navbar-toggler {
        display: block;
    }
    
    .navbar-nav {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: white;
        flex-direction: column;
        padding: var(--space-xl);
        box-shadow: var(--shadow-lg);
        transition: var(--transition-base);
    }
    
    .navbar-nav.show {
        left: 0;
    }
    
    /* Hero */
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    /* Sections */
    .section-title {
        font-size: 2rem;
    }
    
    /* Grids */
    .about-grid,
    .features-grid,
    .member-stats,
    .events-grid,
    .achievement-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    /* Footer */
    .footer-content {
        flex-direction: column;
        gap: var(--space-xl);
        text-align: center;
    }
    
    .footer-links {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    /* Mobile break */
    .mobile-break {
        display: block;
    }
}