@layer base, layout, components, utilities, pages;

/* Type-level CSS for Column (技術コラム) - 2025 Editorial Design */

@layer pages {
  body.single-column {
    --col-bg: #f7f7f5;
    --col-surface: #ffffff;
    --col-text: #1a1917;
    --col-text-muted: rgba(26, 25, 23, 0.6);
    --col-accent: #b38f2d;
    --col-accent-light: #d8b768;
    --col-border: rgba(26, 25, 23, 0.06);
    --col-border-strong: rgba(26, 25, 23, 0.12);

    background: var(--col-bg);
  }

  .column-entry {
    margin-bottom: clamp(56px, 10vw, 100px);
  }

  /* ─────────────────────────────────────────────
     Column Body - Two-column Editorial Layout
     ───────────────────────────────────────────── */
  .column-body {
    margin-top: clamp(48px, 8vw, 80px);
  }

  .column-body__inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(32px, 5vw, 56px);
    align-items: start;
  }

  /* Two-column layout when TOC is present */
  .column-body__inner:has(.column-body__toc) {
    grid-template-columns: 260px 1fr;
  }

  /* ─────────────────────────────────────────────
     Sticky TOC Sidebar - Improved Scroll UX
     ───────────────────────────────────────────── */
  .column-body__toc {
    position: sticky;
    top: clamp(90px, 12vw, 120px);
    align-self: start;
  }

  .column-body__toc .toc {
    background: var(--col-surface);
    border: 1px solid var(--col-border-strong);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    position: relative;
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 160px);
    overflow: hidden;
  }

  /* Top accent bar */
  .column-body__toc .toc::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--col-accent);
    z-index: 2;
  }

  /* TOC Header - Fixed position */
  .column-body__toc .toc::after {
    content: '目次';
    display: block;
    padding: 16px 20px 12px;
    font-family: "DM Sans", var(--font-sans);
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--col-accent);
    background: var(--col-surface);
    border-bottom: 1px solid var(--col-border);
    flex-shrink: 0;
    position: relative;
    z-index: 1;
  }

  /* TOC List Container - Scrollable */
  .column-body__toc .toc__list {
    margin: 0;
    padding: 12px 16px 16px;
    list-style: none;
    overflow-y: auto;
    flex: 1;
    min-height: 0;

    /* Custom scrollbar - Subtle track */
    scrollbar-width: thin;
    scrollbar-color: rgba(179, 143, 45, 0.3) rgba(0, 0, 0, 0.03);
  }

  .column-body__toc .toc__list::-webkit-scrollbar {
    width: 6px;
  }

  .column-body__toc .toc__list::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.02);
    border-radius: 3px;
  }

  .column-body__toc .toc__list::-webkit-scrollbar-thumb {
    background: rgba(179, 143, 45, 0.25);
    border-radius: 3px;
    transition: background 0.2s ease;
  }

  .column-body__toc .toc__list::-webkit-scrollbar-thumb:hover {
    background: rgba(179, 143, 45, 0.5);
  }

  /* Scroll fade indicators */
  .column-body__toc .toc {
    --fade-height: 24px;
  }

  /* TOC Items */
  .column-body__toc .toc__item {
    margin: 0;
    padding: 0;
  }

  .column-body__toc .toc__item a {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 12px;
    color: var(--col-text);
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
  }

  .column-body__toc .toc__item a:hover,
  .column-body__toc .toc__item a:focus-visible {
    background: rgba(179, 143, 45, 0.08);
    color: var(--col-accent);
  }

  /* Index number - Monospace accent */
  .column-body__toc .toc__index {
    flex-shrink: 0;
    min-width: 24px;
    font-family: "DM Sans", var(--font-sans);
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--col-accent);
    opacity: 0.85;
    text-align: right;
    padding-right: 4px;
    line-height: 1.5;
  }

  /* Text label */
  .column-body__toc .toc__text {
    font-size: 0.85rem;
    font-weight: 500;
    line-height: 1.5;
    flex: 1;
  }

  /* Child items (h3) - Indented */
  .column-body__toc .toc__item--child {
    margin-left: 12px;
  }

  .column-body__toc .toc__item--child a {
    padding: 7px 12px;
  }

  .column-body__toc .toc__item--child .toc__index {
    font-size: 0.68rem;
    opacity: 0.65;
  }

  .column-body__toc .toc__item--child .toc__text {
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--col-text-muted);
  }

  .column-body__toc .toc__item--child a:hover .toc__text,
  .column-body__toc .toc__item--child a:focus-visible .toc__text {
    color: var(--col-accent);
  }

  /* Active state indicator (for JS enhancement) */
  .column-body__toc .toc__item.is-active > a {
    background: rgba(179, 143, 45, 0.1);
  }

  .column-body__toc .toc__item.is-active > a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 3px;
    background: var(--col-accent);
    border-radius: 0 2px 2px 0;
  }

  /* ─────────────────────────────────────────────
     Main Content Area - Clean Editorial
     ───────────────────────────────────────────── */
  .column-body__content {
    background: var(--col-surface);
    padding: clamp(36px, 6vw, 56px);
    border: 1px solid var(--col-border-strong);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
    min-height: clamp(400px, 40vw, 600px);
    position: relative;
  }

  /* Top accent bar */
  .column-body__content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--col-accent);
  }

  .column-body__content > *:first-child {
    margin-top: 0;
  }

  /* ─────────────────────────────────────────────
     Typography
     ───────────────────────────────────────────── */
  .column-body__content p {
    font-size: 1rem;
    line-height: 1.95;
    color: var(--col-text);
    font-weight: 400;
    margin-bottom: 1.6em;
  }

  .column-body__content h2 {
    margin-top: clamp(40px, 6vw, 56px);
    margin-bottom: clamp(16px, 2.5vw, 24px);
    font-family: var(--font-serif);
    font-size: clamp(1.35rem, 2.5vw, 1.75rem);
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: 0;
    color: var(--col-text);
    scroll-margin-top: clamp(90px, 10vw, 120px);
    position: relative;
    padding-left: clamp(16px, 2.5vw, 22px);
  }

  .column-body__content h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.2em;
    bottom: 0.2em;
    width: 3px;
    background: var(--col-accent);
  }

  .column-body__content h3 {
    margin-top: clamp(32px, 5vw, 44px);
    margin-bottom: clamp(12px, 2vw, 18px);
    font-family: var(--font-serif);
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    font-weight: 600;
    line-height: 1.45;
    color: var(--col-text);
    scroll-margin-top: clamp(90px, 10vw, 120px);
  }

  .column-body__content h4 {
    margin-top: clamp(24px, 3.5vw, 32px);
    margin-bottom: clamp(10px, 1.5vw, 14px);
    font-family: var(--font-sans);
    font-size: clamp(0.95rem, 1.5vw, 1.1rem);
    font-weight: 600;
    color: var(--col-text);
    scroll-margin-top: clamp(90px, 10vw, 120px);
  }

  /* ─────────────────────────────────────────────
     Blockquotes
     ───────────────────────────────────────────── */
  .column-body__content blockquote {
    margin: clamp(28px, 4vw, 40px) 0;
    padding: clamp(20px, 3vw, 28px);
    padding-left: clamp(24px, 3.5vw, 32px);
    background: var(--col-bg);
    border-left: 3px solid var(--col-accent);
    font-size: 1rem;
    line-height: 1.85;
    color: var(--col-text);
    font-style: normal;
  }

  .column-body__content blockquote p {
    margin-bottom: 0;
  }

  /* ─────────────────────────────────────────────
     Lists
     ───────────────────────────────────────────── */
  .column-body__content ul,
  .column-body__content ol {
    margin: clamp(18px, 2.5vw, 24px) 0;
    padding-left: 0;
    list-style: none;
  }

  .column-body__content ul li,
  .column-body__content ol li {
    position: relative;
    padding-left: clamp(20px, 2.5vw, 26px);
    margin-bottom: 0.7em;
    line-height: 1.8;
  }

  .column-body__content ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.7em;
    width: 6px;
    height: 6px;
    background: var(--col-accent);
  }

  .column-body__content ol {
    counter-reset: list-counter;
  }

  .column-body__content ol li {
    counter-increment: list-counter;
  }

  .column-body__content ol li::before {
    content: counter(list-counter);
    position: absolute;
    left: 0;
    top: 0;
    font-family: "DM Sans", var(--font-sans);
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--col-accent);
    min-width: 16px;
  }

  /* ─────────────────────────────────────────────
     Images & Figures
     ───────────────────────────────────────────── */
  .column-body__content figure {
    margin: clamp(28px, 4vw, 40px) 0;
  }

  .column-body__content figure img {
    border: 1px solid var(--col-border-strong);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    transition: all 0.25s ease;
  }

  .column-body__content figure:hover img {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  }

  .column-body__content figcaption {
    margin-top: clamp(10px, 1.5vw, 14px);
    font-size: 0.85rem;
    color: var(--col-text-muted);
    text-align: center;
    font-weight: 400;
  }

  /* ─────────────────────────────────────────────
     Tables
     ───────────────────────────────────────────── */
  .column-body__content table {
    width: 100%;
    margin: clamp(24px, 3.5vw, 36px) 0;
    border-collapse: collapse;
    font-size: 0.92rem;
  }

  .column-body__content th,
  .column-body__content td {
    padding: clamp(12px, 1.8vw, 16px);
    text-align: left;
    border: 1px solid var(--col-border-strong);
  }

  .column-body__content th {
    background: var(--col-bg);
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.82rem;
    color: var(--col-text);
  }

  .column-body__content td {
    color: var(--col-text-muted);
  }

  .column-body__content tr:hover td {
    background: rgba(179, 143, 45, 0.03);
  }

  /* ─────────────────────────────────────────────
     Code Blocks
     ───────────────────────────────────────────── */
  .column-body__content pre {
    margin: clamp(24px, 3.5vw, 36px) 0;
    padding: clamp(18px, 2.5vw, 24px);
    background: #1c1b19;
    border: 1px solid #2e2d2b;
    border-radius: 4px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.88rem;
    line-height: 1.6;
    color: #e8e6e3;
  }

  .column-body__content code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    padding: 2px 5px;
    background: rgba(179, 143, 45, 0.08);
    border-radius: 3px;
    color: var(--col-accent);
  }

  .column-body__content pre code {
    padding: 0;
    background: transparent;
    border-radius: 0;
    color: inherit;
  }

  /* ─────────────────────────────────────────────
     Responsive
     ───────────────────────────────────────────── */
  @media (max-width: 1024px) {
    .column-body__inner,
    .column-body__inner:has(.column-body__toc) {
      grid-template-columns: 1fr;
      gap: clamp(24px, 5vw, 36px);
    }

    .column-body__toc {
      position: static;
      order: -1;
    }

    .column-body__toc .toc {
      max-height: 280px;
    }

    .column-body__content {
      min-height: auto;
    }
  }

  @media (max-width: 680px) {
    .column-body {
      margin-top: clamp(36px, 7vw, 56px);
    }

    .column-body__toc .toc {
      max-height: 240px;
    }

    .column-body__toc .toc::after {
      padding: 14px 16px 10px;
      font-size: 0.68rem;
    }

    .column-body__toc .toc__list {
      padding: 10px 12px 14px;
    }

    .column-body__toc .toc__item a {
      padding: 8px 10px;
    }

    .column-body__content {
      padding: clamp(24px, 6vw, 36px);
    }

    .column-body__content h2 {
      padding-left: 14px;
    }

    .column-body__content h2::before {
      width: 2px;
    }
  }

  @media (max-width: 480px) {
    .column-body__toc .toc {
      max-height: 200px;
    }

    .column-body__content {
      padding: 20px;
    }

    .column-body__content blockquote {
      padding: 16px;
      padding-left: 20px;
    }
  }
}