:root {
    --color-primary: #192841;
    --color-accent: #FFC107;
    --color-text: #333;
    --color-text-light: #fff;
    --color-bg: #f9f9f9;
    --color-bg-card: #fff;
    --font-base: 'Noto Sans JP', sans-serif;
    --transition-speed: 0.3s;
}

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

body {
    font-family: var(--font-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 700;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
    text-align: center;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-primary);
}

.btn-primary:hover {
    background-color: #e0a800;
}

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

.btn-secondary:hover {
    background-color: var(--color-accent);
    color: var(--color-primary);
}

.section {
    padding: 80px 0;
}

.section-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 40px;
    color: var(--color-primary);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--color-accent);
    margin: 10px auto 0;
}

/* Header */
.header {
    background-color: var(--color-primary);
    color: var(--color-text-light);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 700;
}

.nav-list {
    display: flex;
    gap: 20px;
}

.nav-item a {
    font-weight: 500;
    transition: color var(--transition-speed);
}

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

/* Hero Section */
.hero {
    background-color: var(--color-primary);
    color: var(--color-text-light);
    padding: 100px 0;
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    margin-bottom: 20px;
    line-height: 1.3;
}

.hero-text {
    font-size: 1.1rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

/* Works Section */
.works-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.card {
    background-color: var(--color-bg-card);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.card-img {
    width: 100%;
    object-fit: cover;
    background-color: #ddd;
}

.card-body {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: 10px;
    color: var(--color-primary);
}

.card-meta {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 15px;
}

.card-meta span {
    display: block;
    margin-bottom: 5px;
}

.card-btn {
    margin-top: auto;
    align-self: flex-start;
    font-size: 0.9rem;
    color: var(--color-primary);
    font-weight: 700;
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 2px;
}

.card-btn:hover {
    color: var(--color-accent);
}

/* Skills Section */
.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
}

.skill-item {
    background-color: var(--color-bg-card);
    padding: 30px;
    border-radius: 8px;
    text-align: center;
    width: calc(25% - 20px);
    min-width: 200px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.skill-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 15px;
}

.skill-name {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--color-primary);
}

.skill-desc {
    font-size: 0.9rem;
    color: #666;
}

/* Contact Section */
.contact {
    text-align: center;
    background-color: #f0f2f5;
}

.contact-text {
    margin-bottom: 30px;
}

/* Footer */
.footer {
    background-color: var(--color-primary);
    color: var(--color-text-light);
    text-align: center;
    padding: 20px 0;
    font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 768px) {
    .works-grid {
        grid-template-columns: 1fr;
    }

    .skill-item {
        width: 100%;
    }

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