:root {
    --bg-dark: #0a0c10;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --accent: #22d3ee;
    --accent-gradient: linear-gradient(135deg, #22d3ee 0%, #3b82f6 100%);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --header-height: 80px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
header {
    height: var(--header-height);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 12, 16, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--card-border);
    display: flex;
    align-items: center;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
}

.logo:hover {
    opacity: 0.8;
}

.logo span {
    color: #ff3b3b; /* 鮮やかな赤 */
    margin-right: 1px;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--accent);
}

/* Hero Section */
#hero {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    z-index: -2;
    transform: scale(1.1);
    animation: zoomOut 20s linear infinite alternate;
}

@keyframes zoomOut {
    from { transform: scale(1.1); }
    to { transform: scale(1); }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, transparent 0%, var(--bg-dark) 80%);
    z-index: -1;
}

.hero-content {
    max-width: 800px;
}

h1 {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.highlight {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 10px 20px rgba(34, 211, 238, 0.2);
}

.btn-primary:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(34, 211, 238, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

.cta-group {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

/* Projects Section */
#projects {
    padding: 100px 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 3rem;
    text-align: center;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    overflow: hidden;
    transition: var(--transition);
    backdrop-filter: blur(5px);
}

.project-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.card-image {
    width: 100%;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: #1a1e26;
    display: flex;
    justify-content: center;
    align-items: center;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

.card-content {
    padding: 1.5rem;
}

.badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 800;
    padding: 0.25rem 0.75rem;
    background: rgba(34, 211, 238, 0.1);
    color: var(--accent);
    border-radius: 50px;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.card-content p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

.view-link {
    text-decoration: none;
    color: var(--accent);
    font-weight: 700;
    font-size: 1rem;
    transition: var(--transition);
}

.view-link:hover {
    margin-left: 5px;
}

/* About Section */
#about {
    padding: 100px 0;
    border-top: 1px solid var(--card-border);
}

.about-text {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-text p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Contact Section */
#contact {
    padding: 100px 0;
}

.contact-box {
    background: var(--accent-gradient);
    border-radius: 30px;
    padding: 4rem;
    text-align: center;
    color: #fff;
    box-shadow: 0 40px 80px rgba(34, 211, 238, 0.15);
}

.contact-box h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.contact-box p {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
}

.contact-box .btn-primary {
    background: #fff;
    color: var(--bg-dark);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* Footer */
footer {
    padding: 50px 0;
    border-top: 1px solid var(--card-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-secondary);
}

.social-links a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 1.5rem;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--accent);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 1s forwards;
}

.fade-in-up {
    opacity: 0;
    transform: translateY(40px);
    animation: fadeInUp 0.8s forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

@keyframes fadeIn {
    to { opacity: 1; transform: translateY(0); }
}

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

/* Mobile Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .nav-links { display: none; }
    .cta-group {
        flex-direction: column;
        align-items: stretch;
        max-width: 300px;
        gap: 1rem;
    }
    .btn {
        text-align: center;
    }
    .contact-box { padding: 2.5rem 1.5rem; }
    .contact-box h2 { font-size: 2rem; }
    .footer-content { flex-direction: column; gap: 1.5rem; text-align: center; }
    .social-links a { margin: 0 0.75rem; }
}