@layer reset, tokens, base, components, utilities;

@layer reset {
  *, *::before, *::after { box-sizing: border-box; margin: 0; }
  img, picture, video { display: block; max-width: 100%; }
  input, button, textarea { font: inherit; }
}

@layer tokens {
  :root {
    color-scheme: light;
    --bg:    #ffffff;
    --bg-soft: #f7f8fa;
    --fg:    #1a1a1a;
    --muted: #6b7280;
    --pri:   oklch(60% 0.16 250);
    --pri-soft: color-mix(in oklch, var(--pri), white 88%);
    --accent: oklch(70% 0.18 30);
    --line:  #e5e7eb;
    --line-strong: #d1d5db;
    --radius: 0.6rem;
    --radius-lg: 1rem;
    --shadow: 0 1px 2px rgba(0,0,0,.04), 0 4px 12px rgba(0,0,0,.06);
    --font-sans: -apple-system, BlinkMacSystemFont, "Pretendard", "Apple SD Gothic Neo", sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, monospace;
  }
}

@layer base {
  body {
    font-family: var(--font-sans);
    line-height: 1.65;
    background: var(--bg);
    color: var(--fg);
    -webkit-font-smoothing: antialiased;
  }
  main { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem 4rem; }
  h1 { font-size: clamp(1.75rem, 3.5vw, 2.6rem); line-height: 1.2; letter-spacing: -0.02em; }
  h2 { font-size: clamp(1.25rem, 2vw, 1.6rem); margin: 0 0 1rem; letter-spacing: -0.01em; }
  h3 { font-size: 1.05rem; margin-bottom: 0.5rem; }
  code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    padding: 0.1em 0.35em;
    background: var(--pri-soft);
    color: var(--pri);
    border-radius: 0.3rem;
  }
  a { color: var(--pri); text-decoration: none; }
  a:hover { text-decoration: underline; }
}

@layer components {
  .hero {
    padding: 4rem 1.5rem 2.5rem;
    max-width: 1200px;
    margin: 0 auto;
    & .eyebrow {
      color: var(--muted);
      text-transform: uppercase;
      letter-spacing: 0.08em;
      font-size: 0.78rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
    }
    & .lede {
      color: var(--muted);
      font-size: 1.1rem;
      margin-top: 0.75rem;
    }
  }

  section { margin-top: 3rem; }

  .section-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
    & .hint { color: var(--muted); font-size: 0.85rem; }
  }

  .tldr {
    background: var(--bg-soft);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 1.75rem 2rem;
    & ul {
      list-style: none;
      display: grid;
      gap: 0.6rem;
      padding: 0;
    }
    & li {
      padding-left: 1.5rem;
      position: relative;
      &::before {
        content: "▸";
        position: absolute;
        left: 0;
        color: var(--pri);
        font-weight: 700;
      }
    }
  }

  .table-wrap {
    overflow-x: auto;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    background: var(--bg);
  }

  table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
    & thead th {
      background: var(--bg-soft);
      text-align: left;
      padding: 0.85rem 1rem;
      font-weight: 600;
      border-bottom: 1px solid var(--line-strong);
      cursor: pointer;
      user-select: none;
      white-space: nowrap;
      position: sticky;
      top: 0;
      &[data-sort='asc']::after { content: " ↑"; color: var(--pri); }
      &[data-sort='desc']::after { content: " ↓"; color: var(--pri); }
      &[data-dir='asc']::after { content: " ↑"; color: var(--pri); }
      &[data-dir='desc']::after { content: " ↓"; color: var(--pri); }
    }
    & tbody td {
      padding: 0.75rem 1rem;
      border-bottom: 1px solid var(--line);
      vertical-align: top;
    }
    & tbody tr:last-child td { border-bottom: 0; }
    & tbody tr:hover { background: color-mix(in oklch, var(--pri-soft), white 50%); }
  }

  .cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    & .card {
      background: var(--bg);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 1.25rem 1.5rem;
      box-shadow: var(--shadow);
      & h3 {
        color: var(--pri);
        font-size: 0.95rem;
        text-transform: uppercase;
        letter-spacing: 0.04em;
      }
      & p { color: var(--fg); font-size: 0.92rem; line-height: 1.55; }
    }
  }

  .sources {
    background: var(--bg-soft);
    border-radius: var(--radius);
    padding: 1.25rem 1.75rem;
    & ul {
      list-style: none;
      padding: 0;
      display: grid;
      gap: 0.4rem;
      font-size: 0.88rem;
    }
    & li::before { content: "↗ "; color: var(--muted); }
  }

  .footnote {
    font-size: 0.78rem;
    color: var(--muted);
    padding: 0.75rem 1rem;
    background: var(--bg-soft);
    border-top: 1px solid var(--line);
    margin: 0;
    line-height: 1.5;
  }

  footer {
    text-align: center;
    color: var(--muted);
    font-size: 0.82rem;
    padding: 2rem 1.5rem 3rem;
    border-top: 1px solid var(--line);
    margin-top: 3rem;
  }
}

@container (max-width: 600px) {
  .cards { grid-template-columns: 1fr; }
}