/* ==========================================================================
   Column — Single Article & Archive
   Light pages (#fff background) with high-readability typography.
   ========================================================================== */

/* ==========================================================================
   Single: Hero
   ========================================================================== */
.column-hero {
    padding: 100px 24px 60px;
    text-align: center;
    position: relative;
}

.column-hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: radial-gradient(ellipse at 50% 0%, rgba(35,148,171,.05) 0%, transparent 60%);
    pointer-events: none;
}

.column-hero-inner {
    position: relative;
    max-width: 760px;
    margin: 0 auto;
}

.column-hero-cat {
    display: inline-block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .15em;
    text-transform: uppercase;
    color: #2394ab;
    text-decoration: none;
    margin-bottom: 24px;
    transition: opacity .3s ease;
}

.column-hero-cat:hover {
    opacity: .7;
}

.column-hero-title {
    font-family: 'Inter', sans-serif;
    font-size: clamp(28px, 5vw, 48px);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -.03em;
    color: #111;
    margin-bottom: 20px;
}

.column-hero-meta {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    letter-spacing: .05em;
    color: #999;
}

.column-hero-meta-sep {
    margin: 0 8px;
}

/* ==========================================================================
   Single: Article Body
   ========================================================================== */
.column-body {
    padding: 0 24px 80px;
}

.column-body-inner {
    max-width: 760px;
    margin: 0 auto;
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 16px;
    line-height: 2;
    color: #333;
    letter-spacing: -.01em;
}

/* --- Headings --- */
.column-body-inner h2 {
    font-family: 'Inter', sans-serif;
    font-size: clamp(22px, 3vw, 28px);
    font-weight: 800;
    line-height: 1.3;
    letter-spacing: -.02em;
    color: #111;
    margin-top: 64px;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(35,148,171,.15);
}

.column-body-inner h3 {
    font-family: 'Inter', sans-serif;
    font-size: clamp(17px, 2.5vw, 21px);
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: -.01em;
    color: #222;
    margin-top: 48px;
    margin-bottom: 16px;
}

.column-body-inner h4 {
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: .04em;
    color: #2394ab;
    text-transform: uppercase;
    margin-top: 36px;
    margin-bottom: 12px;
}

/* --- Paragraphs --- */
.column-body-inner p {
    margin-bottom: 1.6em;
}

.column-body-inner p:last-child {
    margin-bottom: 0;
}

/* --- Strong & Emphasis --- */
.column-body-inner strong {
    color: #111;
    font-weight: 700;
}

.column-body-inner em {
    font-style: italic;
    color: #555;
}

/* --- Links --- */
.column-body-inner a {
    color: #2394ab;
    text-decoration: none;
    border-bottom: 1px solid rgba(35,148,171,.3);
    transition: border-color .3s ease, opacity .3s ease;
}

.column-body-inner a:hover {
    border-color: #2394ab;
    opacity: .8;
}

/* --- Lists --- */
.column-body-inner ul,
.column-body-inner ol {
    margin: 0 0 1.6em 24px;
    padding: 0;
}

.column-body-inner ul li,
.column-body-inner ol li {
    list-style: disc;
    margin-bottom: 8px;
    line-height: 1.9;
    color: #444;
}

.column-body-inner ol li {
    list-style: decimal;
}

.column-body-inner ul li strong,
.column-body-inner ol li strong {
    color: #222;
}

/* Nested list */
.column-body-inner ul ul,
.column-body-inner ol ol,
.column-body-inner ul ol,
.column-body-inner ol ul {
    margin-top: 8px;
    margin-bottom: 0;
}

/* --- Horizontal Rule --- */
.column-body-inner hr {
    border: none;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(35,148,171,.2), transparent);
    margin: 48px 0;
}

/* --- Blockquote --- */
.column-body-inner blockquote {
    margin: 32px 0;
    padding: 20px 24px;
    border-left: 3px solid #2394ab;
    background: rgba(35,148,171,.03);
    border-radius: 0 4px 4px 0;
}

.column-body-inner blockquote p {
    font-size: 15px;
    color: #555;
    margin-bottom: 0;
}

.column-body-inner blockquote p + p {
    margin-top: 12px;
}

/* --- Inline Code --- */
.column-body-inner code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875em;
    background: #f4f4f6;
    color: #c7254e;
    padding: 2px 6px;
    border-radius: 3px;
    word-break: break-word;
}

/* --- Code Block --- */
.column-body-inner pre {
    margin: 32px 0;
    padding: 24px;
    background: #0d1117;
    color: #e6edf3;
    border-radius: 6px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border: 1px solid rgba(255,255,255,.06);
}

.column-body-inner pre code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    line-height: 1.7;
    background: none;
    color: inherit;
    padding: 0;
    border-radius: 0;
    word-break: normal;
}

/* Scrollbar styling for code blocks */
.column-body-inner pre::-webkit-scrollbar {
    height: 6px;
}

.column-body-inner pre::-webkit-scrollbar-track {
    background: rgba(255,255,255,.04);
}

.column-body-inner pre::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,.12);
    border-radius: 3px;
}

/* --- Tables --- */
.column-body-inner table {
    width: 100%;
    margin: 32px 0;
    border-collapse: collapse;
    font-size: 14px;
    line-height: 1.6;
}

.column-body-inner thead th {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
    text-align: left;
    color: #2394ab;
    padding: 12px 16px;
    border-bottom: 2px solid rgba(35,148,171,.2);
    white-space: nowrap;
}

.column-body-inner tbody td {
    padding: 12px 16px;
    border-bottom: 1px solid #eee;
    color: #444;
    vertical-align: top;
}

.column-body-inner tbody tr:last-child td {
    border-bottom: none;
}

.column-body-inner tbody tr:hover {
    background: rgba(35,148,171,.02);
}

/* Responsive table wrapper */
.column-body-inner .table-wrapper {
    overflow-x: auto;
    margin: 32px 0;
    -webkit-overflow-scrolling: touch;
}

/* --- Images --- */
.column-body-inner img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    margin: 32px 0;
}

/* --- Mermaid diagrams (rendered as code blocks) --- */
.column-body-inner .mermaid {
    margin: 32px 0;
    text-align: center;
}

/* ==========================================================================
   Single: Prev / Next Navigation
   ========================================================================== */
.column-nav {
    border-top: 1px solid #eee;
    padding: 0 24px;
}

.column-nav-inner {
    max-width: 760px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    padding: 48px 0;
}

.column-nav-item {
    min-width: 0;
}

.column-nav-next {
    text-align: right;
}

.column-nav-label {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: #999;
    margin-bottom: 8px;
}

.column-nav-link {
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.4;
    color: #222;
    text-decoration: none;
    transition: color .3s ease;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.column-nav-link:hover {
    color: #2394ab;
}

/* ==========================================================================
   Single: Back to List
   ========================================================================== */
.column-back {
    text-align: center;
    padding: 0 24px 80px;
}

.column-back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: #999;
    text-decoration: none;
    transition: color .3s ease;
}

.column-back-link:hover {
    color: #2394ab;
}

.column-back-arrow {
    transition: transform .3s ease;
}

.column-back-link:hover .column-back-arrow {
    transform: translateX(-4px);
}

/* ==========================================================================
   Archive: Hero
   ========================================================================== */
.column-archive-hero {
    padding: 100px 24px 48px;
    text-align: center;
    position: relative;
}

.column-archive-hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: radial-gradient(ellipse at 50% 0%, rgba(35,148,171,.05) 0%, transparent 60%);
    pointer-events: none;
}

.column-archive-hero-inner {
    position: relative;
}

.column-archive-hero-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .2em;
    text-transform: uppercase;
    color: #2394ab;
    margin-bottom: 24px;
}

.column-archive-hero-title {
    font-family: 'Inter', sans-serif;
    font-size: clamp(36px, 6vw, 64px);
    font-weight: 900;
    line-height: 1;
    letter-spacing: -.04em;
    color: #111;
    margin-bottom: 16px;
    text-transform: lowercase;
}

.column-archive-hero-sub {
    font-size: 15px;
    color: #888;
    max-width: 480px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ==========================================================================
   Archive: Category Filter
   ========================================================================== */
.column-filter {
    padding: 0 24px;
    margin-bottom: 48px;
}

.column-filter-inner {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
}

.column-filter-item {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    font-weight: 400;
    letter-spacing: .08em;
    text-transform: uppercase;
    text-decoration: none;
    color: #888;
    padding: 8px 16px;
    border: 1px solid #e0e0e0;
    border-radius: 0;
    transition: all .3s ease;
}

.column-filter-item:hover {
    color: #2394ab;
    border-color: #2394ab;
}

.column-filter-item.is-active {
    color: #fff;
    background: #2394ab;
    border-color: #2394ab;
}

/* ==========================================================================
   Archive: Card Grid
   ========================================================================== */
.column-grid {
    padding: 0 24px 80px;
}

.column-grid-inner {
    max-width: 1080px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.column-grid-empty {
    grid-column: 1 / -1;
    text-align: center;
    color: #999;
    font-size: 15px;
    padding: 60px 0;
}

/* --- Card --- */
.column-card {
    display: block;
    text-decoration: none;
    color: inherit;
    border: 1px solid #eee;
    border-radius: 0;
    transition: border-color .3s ease, box-shadow .3s ease, transform .3s ease;
}

.column-card:hover {
    border-color: rgba(35,148,171,.3);
    box-shadow: 0 4px 24px rgba(35,148,171,.06);
    transform: translateY(-2px);
}

.column-card-inner {
    padding: 28px 24px;
    display: flex;
    flex-direction: column;
    min-height: 200px;
}

.column-card-cat {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: #2394ab;
    margin-bottom: 12px;
}

.column-card-title {
    font-family: 'Inter', sans-serif;
    font-size: 18px;
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: -.02em;
    color: #111;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.column-card-excerpt {
    font-size: 13px;
    line-height: 1.7;
    color: #888;
    margin-bottom: auto;
    padding-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.column-card-date {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: .05em;
    color: #bbb;
}

/* ==========================================================================
   Archive: Pagination
   ========================================================================== */
.column-pagination {
    padding: 0 24px 80px;
    text-align: center;
}

.column-pagination .page-numbers {
    display: inline-flex;
    gap: 0;
    list-style: none;
    margin: 0;
    padding: 0;
}

.column-pagination .page-numbers li {
    list-style: none;
}

.column-pagination .page-numbers a,
.column-pagination .page-numbers span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 12px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    letter-spacing: .05em;
    text-decoration: none;
    color: #888;
    border: 1px solid #eee;
    margin-left: -1px;
    transition: all .3s ease;
}

.column-pagination .page-numbers a:hover {
    color: #2394ab;
    border-color: #2394ab;
    z-index: 1;
}

.column-pagination .page-numbers .current {
    color: #fff;
    background: #2394ab;
    border-color: #2394ab;
    z-index: 1;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 768px) {
    /* Hero */
    .column-hero { padding: 80px 20px 40px; }
    .column-archive-hero { padding: 80px 20px 32px; }

    /* Body */
    .column-body { padding: 0 16px 60px; }
    .column-body-inner { font-size: 15px; }
    .column-body-inner h2 { margin-top: 48px; }
    .column-body-inner h3 { margin-top: 36px; }
    .column-body-inner pre { margin-left: -16px; margin-right: -16px; border-radius: 0; padding: 20px 16px; }

    /* Table horizontal scroll */
    .column-body-inner table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }

    /* Nav */
    .column-nav-inner { grid-template-columns: 1fr; gap: 32px; }
    .column-nav-next { text-align: left; }

    /* Grid */
    .column-grid-inner { grid-template-columns: 1fr; }
    .column-card-inner { min-height: auto; padding: 24px 20px; }

    /* Filter */
    .column-filter-inner { justify-content: flex-start; }

    /* Back */
    .column-back { padding: 0 20px 60px; }
}

@media (max-width: 480px) {
    .column-hero-title { font-size: 24px; }
    .column-archive-hero-title { font-size: 32px; }
    .column-body-inner pre code { font-size: 12px; }
}