:root {
    --bg: #f8fafc;
    --surface: #ffffff;
    --surface-2: #111827;
    --text: #0f172a;
    --muted: #475569;
    --line: #e2e8f0;
    --brand: #7c3aed;
    --brand-soft: #f3e8ff;
    --accent: #f59e0b;
    --radius: 20px;
    --shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
    --container: 1100px;
  }

  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    margin: 0;
    font-family: "Noto Sans Thai", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: linear-gradient(180deg, #f8fafc 0%, #eef2ff 100%);
    color: var(--text);
    line-height: 1.85;
  }

  img { max-width: 100%; height: auto; }
  a { color: var(--brand); text-decoration: none; }
  a:hover { text-decoration: underline; }

  .container {
    width: min(calc(100% - 32px), var(--container));
    margin: 0 auto;
  }

  .hero {
    padding: 48px 0 24px;
  }

  .hero__panel {
    background: linear-gradient(135deg, rgba(17, 24, 39, 0.98), rgba(88, 28, 135, 0.92));
    color: #fff;
    border-radius: 28px;
    padding: 38px;
    box-shadow: var(--shadow);
  }

  .eyebrow {
    display: inline-flex;
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(255,255,255,0.12);
    font-size: 14px;
    font-weight: 700;
  }

  h1, h2, h3 {
    line-height: 1.35;
    margin: 0 0 16px;
  }

  h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-top: 18px;
  }

  h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-top: 42px;
  }

  h3 {
    font-size: clamp(1.12rem, 2.2vw, 1.35rem);
    margin-top: 26px;
  }

  .hero__lead {
    max-width: 880px;
    color: rgba(255,255,255,0.88);
    margin: 0;
  }

  .layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 28px;
    padding: 20px 0 64px;
    align-items: start;
  }

  .content,
  .sidebar-card {
    background: rgba(255,255,255,0.92);
    border: 1px solid rgba(255,255,255,0.7);
    border-radius: 24px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
  }

  .content { padding: 34px; }

  .sidebar {
    position: sticky;
    top: 24px;
    display: grid;
    gap: 18px;
  }

  .sidebar-card { padding: 22px; }

  .toc {
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .toc li + li { margin-top: 10px; }
  .toc a { color: var(--text); font-weight: 600; }

  p { margin: 0 0 18px; }
  ul { margin: 0 0 22px; padding-left: 20px; }
  li { margin-bottom: 10px; }

  .table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 22px 0;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    min-width: 720px;
    background: #fff;
    border-radius: 18px;
    overflow: hidden;
  }

  th {
    text-align: left;
    background: #111827;
    color: #fff;
    padding: 14px;
    font-size: 0.96rem;
  }

  td {
    padding: 14px;
    border-bottom: 1px solid var(--line);
    vertical-align: top;
    font-size: 0.97rem;
  }

  tbody tr:nth-child(even) td { background: #f8fafc; }

  .author-box {
    display: grid;
    grid-template-columns: 88px 1fr;
    gap: 18px;
    padding: 24px;
    border-radius: 22px;
    background: linear-gradient(135deg, #111827, #1e293b);
    color: #fff;
    margin-top: 42px;
  }

  .author-box__avatar {
    width: 88px;
    height: 88px;
    border-radius: 50%;
    overflow: hidden;
    background: #1f2937;
  }

  .author-box__avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
  }

  .author-box p {
    color: rgba(255,255,255,0.88);
    margin-bottom: 10px;
  }

  .tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 12px;
  }

  .tag-list span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.14);
    font-size: 0.9rem;
  }

  .article-footer {
    margin-top: 28px;
    padding-top: 20px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 0.95rem;
  }

  @media (max-width: 980px) {
    .layout { grid-template-columns: 1fr; }
    .sidebar { position: static; }
  }

  @media (max-width: 640px) {
    .hero__panel,
    .content,
    .sidebar-card { padding: 22px; border-radius: 20px; }
    .author-box { grid-template-columns: 1fr; }
  }