/* Custom CSS Variables */
:root {
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --accent-color: #f59e0b;
    --text-color: #1f2937;
    --bg-color: #ffffff;
    --light-bg: #f8fafc;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    font-weight: 400;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

/* Header Styles */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 1rem 0;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: white !important;
    text-decoration: none;
}

.navbar-brand img {
    margin-right: 0.5rem;
}

.navbar-nav .nav-link {
    color: white !important;
    font-weight: 500;
    margin: 0 0.5rem;
    padding: 0.5rem 1rem !important;
    border-radius: 25px;
    transition: var(--transition);
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

.hero-section::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 1000 1000"><polygon fill="rgba(255,255,255,0.1)" points="0,1000 1000,0 1000,1000"/></svg>');
    background-size: cover;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    font-weight: 300;
    opacity: 0.9;
}

.hero-buttons {
    margin-top: 2rem;
}

.hero-buttons .btn {
    border-radius: 50px;
    padding: 12px 30px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: var(--transition);
}

.hero-buttons .btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.hero-image {
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-image img {
    max-width: 300px;
    height: 300px;
    object-fit: cover;
    border: 5px solid rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.hero-image img:hover {
    transform: scale(1.05);
}

/* Section Styles */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--primary-color);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.section-description {
    text-align: center;
    font-size: 1.1rem;
    color: #6b7280;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* About Section */
.about-section {
    padding: 80px 0;
    background-color: var(--light-bg);
}

.about-content {
    background: white;
    padding: 3rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
}

.about-content h3 {
    color: var(--primary-color);
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.tech-stack {
    margin: 2rem 0;
}

.tech-stack h4 {
    color: var(--text-color);
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
}

.tech-icons {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.tech-item {
    text-align: center;
    padding: 1rem;
    background: var(--light-bg);
    border-radius: 10px;
    transition: var(--transition);
    min-width: 120px;
}

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

.tech-item i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.tech-item span {
    display: block;
    font-weight: 500;
    color: var(--text-color);
}

.specialties {
    margin-top: 2rem;
}

.specialties h4 {
    color: var(--text-color);
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
}

.specialties ul {
    list-style: none;
    text-align: left;
    max-width: 400px;
    margin: 0 auto;
}

.specialties li {
    margin-bottom: 0.8rem;
    padding-left: 2rem;
    position: relative;
}

.specialties li i {
    position: absolute;
    left: 0;
    top: 0.2rem;
    color: var(--primary-color);
    font-size: 1.1rem;
}

/* Projects Section */
.projects-section {
    padding: 80px 0;
    background: white;
}

.project-card {
    background: white;
    border-radius: 15px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    margin-bottom: 2rem;
}

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

.project-image {
    height: 250px;
    overflow: hidden;
}

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

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-content {
    padding: 2rem;
}

.project-title {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.project-description {
    color: #6b7280;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.project-features ul {
    list-style: none;
    margin-bottom: 2rem;
}

.project-features li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.project-features li i {
    position: absolute;
    left: 0;
    top: 0.2rem;
    color: var(--accent-color);
}

.project-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.project-buttons .btn {
    border-radius: 25px;
    padding: 10px 20px;
    font-weight: 500;
    transition: var(--transition);
}

.project-buttons .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* Services Section */
.services-section {
    padding: 80px 0;
    background: var(--light-bg);
}

.service-card {
    background: white;
    padding: 2.5rem 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    height: 100%;
    margin-bottom: 2rem;
}

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

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.service-icon i {
    font-size: 2rem;
    color: white;
}

.service-card:hover .service-icon {
    transform: scale(1.1);
}

.service-card h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.service-card p {
    color: #6b7280;
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--text-color);
    color: white;
    padding: 3rem 0 1rem;
}

.footer h5 {
    color: var(--accent-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer p {
    color: #d1d5db;
    font-size: 0.9rem;
}

.footer-links {
    list-style: none;
    padding: 0;
}

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

.footer-links a {
    color: #d1d5db;
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.9rem;
}

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

.footer-divider {
    border-color: #374151;
    margin: 2rem 0 1rem;
}

.footer p:last-child {
    margin-bottom: 0;
    color: #9ca3af;
    font-size: 0.8rem;
}

/* Button Styles */
.btn {
    border-radius: 25px;
    padding: 10px 25px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    color: white;
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.btn-outline-light {
    border: 2px solid white;
    color: white;
    background: transparent;
}

.btn-outline-light:hover {
    background: white;
    color: var(--primary-color);
    transform: translateY(-2px);
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.fade-in-up {
    animation: fadeInUp 0.8s ease-out;
}

.fade-in {
    animation: fadeIn 0.8s ease-out;
}

/* Utility Classes */
.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.shadow {
    box-shadow: var(--shadow);
}

.shadow-lg {
    box-shadow: var(--shadow-lg);
}

.rounded-lg {
    border-radius: 15px;
}

.rounded-xl {
    border-radius: 25px;
}

/* Scroll Animations */
.scroll-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

.scroll-animate.animate {
    opacity: 1;
    transform: translateY(0);
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid var(--primary-color);
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* AdSense Advertisement Styles */
.ad-section {
    padding: 40px 0;
    background-color: var(--light-bg);
    margin: 60px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.ad-container {
    position: relative;
    max-width: 728px;
    margin: 0 auto;
    padding: 20px;
    background: #ffffff;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.ad-label {
    font-size: 0.75rem;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 10px;
    font-weight: 500;
}

/* AdSense Responsive Styles */
@media (max-width: 768px) {
    .ad-section {
        padding: 30px 0;
        margin: 40px 0;
    }
    
    .ad-container {
        max-width: 320px;
        padding: 15px;
    }
}

/* AdSense広告ユニット用の追加スタイル */
.ad-container ins {
    display: block;
    margin: 0 auto;
}

.ad-container .adsbygoogle {
    display: block;
    margin: 0 auto;
}