* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, sans-serif;

    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

/* Header */

.portfolio-header {
    border-bottom: 1px solid #cbd5e1;
    background-color: #f5f7fa;
}

.portfolio-header-inner {
    padding-top: 20px;
    padding-bottom: 20px;

    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
}

.portfolio-container {
    max-width: 1120px;
    margin: 0 auto;
    padding-left: 24px;
    padding-right: 24px;
}

.portfolio-title {
    font-weight: 700;
    color: #111827;
    text-decoration: none;
    font-size: 1.125rem;
}

.nav-list {
    display: flex;
    gap: 8px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-link {
    display: inline-block;
    color: #111827;
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 8px;
}

.nav-link:hover,
.nav-link.active {
    background-color: #e8edf5;
}

.site-title:focus-visible,
.nav-link:focus-visible,
.button:focus-visible,
.portfolio-text-link:focus-visible {
    outline: 3px solid #2563eb;
    outline-offset: 3px;
}

.nav-list a {
    color: #111827;
    text-decoration: none;
}


/* Home - Main tag */

.portfolio-introduction {
    background-color: #f5f7fa;
    padding: 80px 24px;
}

.portfolio-introduction-container {
    display: block;
}

.portfolio-introduction-content {
    max-width: 720px;
}


.portfolio-portrait {
    width: 140px;
    height: 140px;
    margin-bottom: 24px;
}

.portfolio-portrait-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    border: 3px solid #ffffff;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
}

.portfolio-label {
    margin: 0 0 12px;
    color: #2563eb;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-size: 0.875rem;
}

h1 {
    margin: 0 0 24px;
    color: #111827;
    font-size: clamp(2rem, 5vw, 3.5rem);
    line-height: 1.1;
}

.portfolio-description {
    margin: 0;
    color: #475569;
    font-size: 1.125rem;
    max-width: 640px;
}

.portfolio-action-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 32px;
}

/* Home - Main tag - Projects Section */

.portfolio-featured-projects {
    background-color: #ffffff;
    padding: 80px 0;
}

.portfolio-section-heading {
    max-width: 720px;
    margin-bottom: 40px;
}

.portfolio-section-heading h2 {
    margin: 0 0 16px;
    color: #111827;
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    line-height: 1.15;
}

.portfolio-section-description {
    margin: 0;
    color: #475569;
    font-size: 1.05rem;
    max-width: 640px;
}

.portfolio-project-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.portfolio-project-card {
    background-color: #f5f7fa;
    border: 1px solid #cbd5e1;
    border-radius: 16px;
    overflow: hidden;
}

.portfolio-project-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-bottom: 1px solid #cbd5e1;
}

.portfolio-project-card-content {
    padding: 24px;
}

.portfolio-project-card h3 {
    margin: 0 0 12px;
    color: #111827;
    font-size: 1.25rem;
    line-height: 1.25;
}

.portfolio-project-card p {
    margin: 0 0 16px;
    color: #475569;
}

.portfolio-text-link {
    color: #2563eb;
    font-weight: 700;
    text-underline-offset: 3px;
}

.portfolio-text-link:hover {
    color: #1d4ed8;
}


.portfolio-tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
    margin: 0 0 20px;
    padding: 0;
}

.portfolio-tag-list li {
    background-color: #e8edf5;
    border: 1px solid #cbd5e1;
    border-radius: 999px;
    color: #111827;
    font-size: 0.875rem;
    padding: 4px 10px;
}

/* Projects */

.portfolio-page-introduction {
    background-color: #f5f7fa;
    padding: 64px 0;
}

.portfolio-project-detail-content {
    background-color: #ffffff;
    padding: 64px 0;
}

.portfolio-project-detail-image {
    width: 100%;
    max-height: 520px;
    object-fit: cover;
    border: 1px solid #cbd5e1;
    border-radius: 16px;
    margin-bottom: 40px;
}

.portfolio-project-overview {
    max-width: 760px;
}

.portfolio-project-overview section {
    margin-bottom: 40px;
}

.portfolio-project-overview h2 {
    margin: 0 0 12px;
    color: #111827;
    font-size: 1.5rem;
    line-height: 1.2;
}

.portfolio-project-overview p {
    margin: 0;
    color: #475569;
}



/* Contact - Cards */

.portfolio-contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    max-width: 760px;
}

.portfolio-contact-card {
    background-color: #f5f7fa;
    border: 1px solid #cbd5e1;
    border-radius: 16px;
    padding: 24px;
}

.portfolio-contact-card h2 {
    margin: 0 0 12px;
    color: #111827;
    font-size: 1.25rem;
}


/* Footer */
.portfolio-footer {
    background-color: #f5f7fa;
    border-top: 1px solid #cbd5e1;
    margin-top: 80px;
}

.portfolio-footer-content {
    padding-top: 24px;
    padding-bottom: 24px;
}

.portfolio-footer p {
    margin: 0;
    color: #475569;
    font-size: 0.95rem;
}


/* Media query */

@media (max-width: 640px) {
    .portfolio-header-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .portfolio-project-grid {
        grid-template-columns: 1fr;
    }

    .nav-list {
        flex-wrap: wrap;
    }

    .nav-link {
        padding: 10px 12px;
    }
}