/* ========================================
   Base
======================================== */

* {
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.6;
    color: #222;
    background: #fff;
}

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

.container {
    width: min(100% - 32px, 1100px);
    margin-inline: auto;
}


/* ========================================
   Header
======================================== */

.site-header {
    border-bottom: 1px solid #e5e5e5;
}

.site-header .container {
    min-height: 72px;

    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 32px;
}

.site-logo {
    font-size: 1.1rem;
    font-weight: 700;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 24px;
}

.site-nav a {
    font-size: 0.95rem;
}

.site-nav a:hover {
    text-decoration: underline;
}


/* ========================================
   Main
======================================== */

main {
    padding-block: 64px;
}

main .container {
    max-width: 1100px;
}


/* ========================================
   Footer
======================================== */

.site-footer {
    margin-top: 64px;
    padding-block: 32px;

    border-top: 1px solid #e5e5e5;

    color: #666;
    font-size: 0.9rem;
}


/* ========================================
   Mobile
======================================== */

@media (max-width: 700px) {

    .site-header .container {
        min-height: auto;

        padding-block: 20px;

        align-items: flex-start;
        flex-direction: column;

        gap: 16px;
    }

    .site-nav {
        flex-wrap: wrap;
        gap: 12px 20px;
    }

    main {
        padding-block: 40px;
    }

}

/* ========================================
   Hero
======================================== */

.hero {
    padding-block: 80px;
}

.hero-label {
    margin: 0 0 16px;

    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: #666;
}

.hero h1 {
    max-width: 760px;

    margin: 0;

    font-size: clamp(2.5rem, 6vw, 5rem);
    line-height: 1.05;
    letter-spacing: -0.04em;
}

.hero-description {
    max-width: 680px;

    margin: 28px 0 0;

    font-size: clamp(1.2rem, 2vw, 1.5rem);
    line-height: 1.5;
    color: #444;
}

.hero-text {
    max-width: 620px;

    margin: 20px 0 0;

    color: #666;
}

.button {
    display: inline-block;

    margin-top: 32px;
    padding: 12px 20px;

    border: 1px solid #222;
    border-radius: 6px;

    font-weight: 600;

    background: #222;
    color: #fff;
}

.button:hover {
    opacity: 0.85;
}


/* ========================================
   Hero — Mobile
======================================== */

@media (max-width: 700px) {

    .hero {
        padding-block: 56px;
    }

    .hero h1 {
        font-size: clamp(2.5rem, 12vw, 4rem);
    }

}

/* ========================================
   Page Header
======================================== */

.page-header {
    padding-block: 48px 40px;
}

.page-label {
    margin: 0 0 12px;

    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: #666;
}

.page-header h1 {
    margin: 0;

    font-size: clamp(2.5rem, 5vw, 4rem);
    line-height: 1.1;
    letter-spacing: -0.03em;
}

.page-header p:last-child {
    max-width: 650px;

    margin-top: 20px;

    color: #666;
}


/* ========================================
   Article List
======================================== */

.article-list {
    padding-block: 20px 80px;
}

.article-card {
    padding-block: 32px;

    border-top: 1px solid #e5e5e5;
}

.article-card:last-child {
    border-bottom: 1px solid #e5e5e5;
}

.article-date {
    margin: 0 0 10px;

    font-size: 0.85rem;
    color: #777;
}

.article-card h2 {
    margin: 0;

    font-size: 1.7rem;
    line-height: 1.3;
}

.article-card h2 a:hover {
    text-decoration: underline;
}

.article-card > p:not(.article-date) {
    max-width: 650px;

    margin: 12px 0 16px;

    color: #666;
}

.article-card > a {
    font-size: 0.95rem;
    font-weight: 600;
}

.article-card > a:hover {
    text-decoration: underline;
}

/* ========================================
   Article
======================================== */

.article {
    padding-block: 64px 100px;
}

.article-header {
    max-width: 760px;
    margin-bottom: 56px;
}

.article-header .article-date {
    margin: 0 0 16px;

    font-size: 0.85rem;
    color: #777;
}

.article-header h1 {
    margin: 0;

    font-size: clamp(2.5rem, 6vw, 4.5rem);
    line-height: 1.05;
    letter-spacing: -0.04em;
}

.article-description {
    margin: 24px 0 0;

    font-size: 1.2rem;
    line-height: 1.6;
    color: #666;
}


/* ========================================
   Article Content
======================================== */

.article-content {
    max-width: 700px;

    font-size: 1.05rem;
    line-height: 1.8;
}

.article-content h2 {
    margin-top: 56px;
    margin-bottom: 20px;

    font-size: 1.8rem;
    line-height: 1.3;
}

.article-content h3 {
    margin-top: 40px;
    margin-bottom: 16px;

    font-size: 1.4rem;
    line-height: 1.4;
}

.article-content p {
    margin: 0 0 24px;
}

.article-content ul,
.article-content ol {
    margin: 0 0 24px;
    padding-left: 24px;
}

.article-content li {
    margin-bottom: 8px;
}

.article-content a {
    text-decoration: underline;
    text-underline-offset: 3px;
}

.article-content blockquote {
    margin: 32px 0;
    padding: 8px 0 8px 24px;

    border-left: 3px solid #222;

    color: #555;
    font-size: 1.1rem;
}

.article-content img {
    display: block;

    max-width: 100%;
    height: auto;

    margin: 40px 0;
}

.article-content code {
    padding: 2px 5px;

    border-radius: 4px;

    background: #f2f2f2;

    font-size: 0.9em;
}

.article-content pre {
    overflow-x: auto;

    margin: 32px 0;
    padding: 20px;

    border-radius: 6px;

    background: #f2f2f2;
}


/* ========================================
   Article — Mobile
======================================== */

@media (max-width: 700px) {

    .article {
        padding-block: 48px 72px;
    }

    .article-header {
        margin-bottom: 40px;
    }

    .article-content {
        font-size: 1rem;
        line-height: 1.75;
    }

}

/* ========================================
   Article Meta
======================================== */

.article-meta {
    display: flex;
    align-items: center;
    gap: 8px;

    margin-bottom: 16px;

    font-size: 0.85rem;
    color: #777;
}