:root {
  --text: #111827;
  --muted: #6b7280;
  --line: #e5e7eb;
  --soft: #f9fafb;
  --bg: #ffffff;
  --brand: #111111;
  --accent: #f59e0b;
  --danger: #dc2626;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif;
  line-height: 1.7;
}

/* Layout */
.wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

.back {
  display: inline-block;
  margin-bottom: 22px;
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}

.back:hover {
  color: var(--text);
}

.footer {
  margin-top: 52px;
  color: var(--muted);
  font-size: 14px;
}

.related-articles {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--line);
}

.related-articles h2 {
  margin-top: 0;
  margin-bottom: 24px;
  font-size: 24px;
}

/* Typography */
h1 {
  margin: 0 0 18px;
  font-size: 44px;
  line-height: 1.12;
  letter-spacing: -0.02em;
}

h2 {
  margin: 42px 0 14px;
  font-size: 28px;
  line-height: 1.25;
}

h3 {
  margin: 32px 0 12px;
  font-size: 21px;
  line-height: 1.3;
}

p {
  margin: 0 0 16px;
  font-size: 17px;
}

ul,
ol {
  margin: 0 0 18px;
  padding-left: 22px;
}

li {
  margin-bottom: 10px;
  font-size: 17px;
}

code {
  background: #f3f4f6;
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 14px;
}

/* Blog Post Specific */
.sub {
  font-size: 19px;
  color: var(--muted);
  margin-bottom: 30px;
}

.meta {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 42px;
}

.box {
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px;
  margin: 24px 0;
}

.prompt-box {
  background: #1e1e2e;
  color: #e0e0e0;
  border: 1px solid #333;
  border-radius: 14px;
  padding: 24px;
  margin: 24px 0;
  font-family: "SF Mono", "JetBrains Mono", "Fira Code", monospace;
  font-size: 14px;
  line-height: 1.6;
  white-space: pre-wrap;
  overflow-x: auto;
}

.steps li strong {
  color: #000;
}

.highlight {
  border-left: 4px solid var(--accent);
  padding-left: 16px;
  margin: 20px 0;
}

.cta {
  margin-top: 50px;
  background: #111111;
  color: #fff;
  border-radius: 18px;
  padding: 30px;
}

.cta h3 {
  margin: 0 0 12px;
  font-size: 25px;
}

.cta p {
  color: rgba(255, 255, 255, 0.88);
  margin-bottom: 18px;
}

.btn {
  display: inline-block;
  background: #fff;
  color: #111111;
  text-decoration: none;
  padding: 12px 18px;
  border-radius: 10px;
  font-weight: 700;
}

.warn-box {
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 14px;
  padding: 20px;
  margin: 24px 0;
}

.warn-box strong {
  color: #92400e;
}

/* Blog List Specific (blog.html) */
.site-sub {
  font-size: 19px;
  color: var(--muted);
  margin-bottom: 48px;
}

.section-title {
  margin: 44px 0 0;
  font-size: 24px;
  line-height: 1.25;
}

.section-desc {
  margin: 4px 0 20px;
  font-size: 15px;
  color: var(--muted);
}

.article-list {
  list-style: none;
  padding: 0;
  margin: 0 0 8px;
}

.article-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.article-item:last-child {
  border-bottom: none;
}

.article-title {
  font-size: 19px;
  font-weight: 600;
  margin: 0 0 4px;
}

.article-title a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.15s ease;
}

.article-title a:hover {
  color: var(--accent);
}

.article-desc {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
  line-height: 1.6;
}

.article-date {
  display: inline-block;
  margin-top: 6px;
  font-size: 13px;
  color: #9ca3af;
}

/* Responsive */
@media (max-width: 640px) {
  h1 {
    font-size: 34px;
  }
  h2, .section-title {
    font-size: 24px;
  }
  .section-title {
    font-size: 21px;
  }
  .article-title {
    font-size: 17px;
  }
  p,
  li, .article-desc {
    font-size: 16px;
  }
  .article-desc {
    font-size: 14px;
  }
}