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

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 50%, #16213e 100%);
    min-height: 100vh;
}

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

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

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

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

.hero-title {
    font-family: 'Orbitron', monospace;
    font-size: 4rem;
    font-weight: 900;
    color: #fff;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
    margin-bottom: 1rem;
    letter-spacing: 0.2em;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: #e0e0e0;
    margin-bottom: 0.5rem;
    font-weight: 300;
}

.hero-description {
    font-size: 1.1rem;
    color: #b0b0b0;
    max-width: 600px;
    margin: 0 auto;
}

.hero-image {
    position: absolute;
    right: 10%;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1;
}

.rider-silhouette {
    width: 300px;
    height: 400px;
    background: linear-gradient(45deg, rgba(255,255,255,0.1), rgba(255,255,255,0.05));
    border-radius: 20px;
    position: relative;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.rider-silhouette::before {
    content: '仮面ライダー';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: 'Orbitron', monospace;
    font-size: 1.2rem;
    color: rgba(255,255,255,0.3);
    writing-mode: vertical-rl;
    text-orientation: mixed;
}

/* Navigation Styles */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 15, 35, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    font-family: 'Orbitron', monospace;
    font-size: 1.8rem;
    font-weight: 700;
    color: #667eea;
}

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

.nav-link {
    color: #e0e0e0;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #667eea;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #667eea;
    transition: width 0.3s ease;
}

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

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: #e0e0e0;
    margin: 3px 0;
    transition: 0.3s;
}

/* Era Sections */
.era-section {
    padding: 80px 0;
    position: relative;
}

.era-section:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

.era-title {
    font-family: 'Orbitron', monospace;
    font-size: 2.5rem;
    font-weight: 700;
    color: #fff;
    text-align: center;
    margin-bottom: 1rem;
    position: relative;
}

.era-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 2px;
}

.era-description {
    text-align: center;
    color: #b0b0b0;
    font-size: 1.1rem;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Riders Grid */
.riders-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.rider-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
}

.rider-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    border-color: #667eea;
}

.rider-image {
    width: 100%;
    height: 250px;
    background: linear-gradient(45deg, #667eea, #764ba2);
    position: relative;
    overflow: hidden;
}

.rider-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.rider-card:hover .rider-image img {
    transform: scale(1.1);
}

.rider-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.1rem;
    font-weight: 500;
}

.rider-info {
    padding: 1.5rem;
}

.rider-name {
    font-family: 'Orbitron', monospace;
    font-size: 1.3rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 0.5rem;
}

.rider-series {
    color: #667eea;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.rider-year {
    color: #b0b0b0;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.rider-description {
    color: #e0e0e0;
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Gallery Section */
.gallery-section {
    padding: 80px 0;
    background: rgba(255, 255, 255, 0.02);
}

.gallery-title {
    font-family: 'Orbitron', monospace;
    font-size: 2.5rem;
    font-weight: 700;
    color: #fff;
    text-align: center;
    margin-bottom: 3rem;
}

.gallery-filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #e0e0e0;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.filter-btn:hover,
.filter-btn.active {
    background: #667eea;
    border-color: #667eea;
    color: #fff;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.gallery-item {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.gallery-item:hover {
    transform: scale(1.05);
}

.gallery-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.gallery-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(102, 126, 234, 0.8), rgba(118, 75, 162, 0.8));
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-overlay h3 {
    color: #fff;
    font-family: 'Orbitron', monospace;
    text-align: center;
    font-size: 1.1rem;
}

/* Footer */
.footer {
    background: rgba(0, 0, 0, 0.8);
    padding: 60px 0 20px;
    margin-top: 80px;
}

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

.footer-section h3,
.footer-section h4 {
    color: #667eea;
    margin-bottom: 1rem;
    font-family: 'Orbitron', monospace;
}

.footer-section p,
.footer-section li {
    color: #b0b0b0;
    line-height: 1.6;
}

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

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: #666;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-image {
        display: none;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: rgba(15, 15, 35, 0.98);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        padding: 2rem 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }
    
    .riders-grid {
        grid-template-columns: 1fr;
    }
    
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
    
    .era-title {
        font-size: 2rem;
    }
    
    .gallery-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .gallery-filters {
        gap: 0.5rem;
    }
    
    .filter-btn {
        padding: 8px 16px;
        font-size: 0.9rem;
    }
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #667eea;
    animation: spin 1s ease-in-out infinite;
}

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

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #1a1a2e;
}

::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #764ba2;
}