*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: #f9f9f7;
  color: #1a1a1a;
  line-height: 1.7;
}

/* HEADER */
header {
  background: #0f1117;
  padding: 0 24px;
}
.header-inner {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  color: #fff;
  font-size: 1.2rem;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: -0.3px;
}
.logo span { color: #4f8ef7; }
nav a {
  color: #aaa;
  text-decoration: none;
  font-size: 0.9rem;
  margin-left: 24px;
  transition: color 0.2s;
}
nav a:hover { color: #fff; }

/* HERO (index only) */
.hero {
  background: #0f1117;
  padding: 56px 24px 64px;
  text-align: center;
  border-bottom: 1px solid #222;
}
.hero h1 {
  color: #fff;
  font-size: 2rem;
  font-weight: 700;
  max-width: 640px;
  margin: 0 auto 16px;
  line-height: 1.3;
}
.hero p {
  color: #888;
  font-size: 1rem;
  max-width: 520px;
  margin: 0 auto;
}

/* ARTICLE GRID */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}
.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: #888;
  margin-bottom: 24px;
}
.article-list { display: flex; flex-direction: column; gap: 24px; }

.article-card {
  background: #fff;
  border: 1px solid #e8e8e4;
  border-radius: 10px;
  padding: 28px 32px;
  text-decoration: none;
  color: inherit;
  display: block;
  transition: box-shadow 0.2s, border-color 0.2s;
}
.article-card:hover {
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  border-color: #c8c8c0;
}
.article-card .meta {
  font-size: 0.8rem;
  color: #999;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.tag {
  background: #eef3ff;
  color: #4f8ef7;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
}
.article-card h2 {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 10px;
  color: #111;
}
.article-card p {
  font-size: 0.9rem;
  color: #666;
  line-height: 1.6;
}

/* ARTICLE PAGE */
.article-wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 100px;
}
.article-wrap .back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #888;
  text-decoration: none;
  font-size: 0.85rem;
  margin-bottom: 36px;
  transition: color 0.2s;
}
.article-wrap .back:hover { color: #333; }
.article-wrap .back::before { content: "←"; }

.article-header { margin-bottom: 40px; }
.article-header .tag-row {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}
.article-header h1 {
  font-size: 1.9rem;
  font-weight: 800;
  line-height: 1.25;
  color: #0f1117;
  margin-bottom: 16px;
}
.article-header .meta {
  font-size: 0.85rem;
  color: #999;
}
.article-header .meta strong { color: #555; }

.article-body { font-size: 1rem; line-height: 1.8; color: #2a2a2a; }
.article-body h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 40px 0 14px;
  color: #0f1117;
}
.article-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 28px 0 10px;
  color: #111;
}
.article-body p { margin-bottom: 18px; }
.article-body ul, .article-body ol {
  margin: 0 0 18px 24px;
}
.article-body li { margin-bottom: 8px; }
.article-body strong { color: #111; }
.article-body em { color: #444; }
.article-body blockquote {
  border-left: 3px solid #4f8ef7;
  padding: 12px 20px;
  margin: 24px 0;
  background: #f0f5ff;
  border-radius: 0 6px 6px 0;
  color: #444;
  font-style: italic;
}
.article-body hr {
  border: none;
  border-top: 1px solid #e8e8e4;
  margin: 36px 0;
}

/* FOOTER */
footer {
  background: #0f1117;
  text-align: center;
  padding: 32px 24px;
  color: #555;
  font-size: 0.82rem;
}
footer a { color: #4f8ef7; text-decoration: none; }

@media (max-width: 600px) {
  .hero h1 { font-size: 1.5rem; }
  .article-card { padding: 20px; }
  .article-header h1 { font-size: 1.5rem; }
}
body { background: #f2f3f2; color: #20282a; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
header { background: #fff; border-bottom: 1px solid #cdd4d5; }
.header-inner, .container { max-width: 1220px; }
.logo { color: #20282a; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; letter-spacing: -.06em; }
.logo span { color: #126b75; }
nav a { color: #486064; }
.hero { padding: 38px 24px; text-align: left; background: #dbe8e8; border-bottom: 1px solid #b8cfd0; }
.hero h1, .hero p { max-width: 1220px; }
.hero h1 { margin-bottom: 8px; color: #173f44; font-size: clamp(1.9rem, 3vw, 3rem); letter-spacing: -.04em; }
.hero p { margin: 0; color: #486064; }
.container { padding-top: 32px; }
.section-label { color: #126b75; letter-spacing: .15em; }
.article-list { gap: 0; border-top: 2px solid #20282a; }
.article-card { display: grid; grid-template-columns: 190px minmax(0, 1fr); column-gap: 30px; padding: 22px 4px; background: transparent; border: 0; border-bottom: 1px solid #cdd4d5; border-radius: 0; }
.article-card:hover { background: #e9eeee; box-shadow: none; border-color: #126b75; }
.article-card .meta { grid-column: 1; grid-row: 1 / span 2; display: flex; flex-direction: column; align-items: flex-start; gap: 6px; margin: 0; }
.tag { color: #126b75; background: transparent; padding: 0; border-radius: 0; text-transform: uppercase; letter-spacing: .08em; }
.article-card h2 { grid-column: 2; margin-bottom: 4px; color: #20282a; font-size: 1.15rem; letter-spacing: -.025em; }
.article-card p { grid-column: 2; color: #57676a; font-size: .85rem; }
.article-wrap { max-width: 900px; }
.article-header { padding-bottom: 24px; border-bottom: 2px solid #20282a; }
.article-header h1 { color: #20282a; font-size: clamp(2rem, 4vw, 3.2rem); letter-spacing: -.05em; }
.article-body { color: #344144; }
.article-body h2 { color: #173f44; padding-bottom: 8px; border-bottom: 1px solid #cdd4d5; }
.article-body blockquote { background: #dbe8e8; border-color: #126b75; }
footer { background: #fff; border-top: 1px solid #cdd4d5; }
footer a { color: #126b75; }
@media (max-width: 680px) {
  .article-card { display: block; }
  .article-card .meta { flex-direction: row; margin-bottom: 9px; }
  .article-card h2, .article-card p { display: block; }
}