@charset "utf-8";

:root {
  --study-bg: #ffffff;
  --study-fg: #1f2328;
  --study-muted: #57606a;
  --study-border: #d8dee4;
  --study-accent: #f38020; /* Cloudflare orange */
  --study-header-bg: #1a1f2b;
  --study-code-bg: #f6f8fa;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--study-bg);
  color: var(--study-fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", "Malgun Gothic", sans-serif;
  line-height: 1.7;
}

a {
  color: var(--study-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.study-header {
  background: var(--study-header-bg);
  color: #fff;
}

.study-header-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.study-header .brand {
  color: #fff;
  font-weight: 700;
  font-size: 18px;
}

.study-nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.study-nav a {
  color: #dfe3e8;
  font-size: 14px;
}

.study-nav a:hover {
  color: var(--study-accent);
}

.study-main {
  max-width: 860px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

.markdown-body h1 {
  font-size: 28px;
  border-bottom: 1px solid var(--study-border);
  padding-bottom: 10px;
}

.markdown-body h2 {
  font-size: 21px;
  margin-top: 36px;
}

.markdown-body h3 {
  font-size: 17px;
  margin-top: 26px;
}

.markdown-body img {
  max-width: 100%;
}

.markdown-body blockquote {
  margin: 16px 0;
  padding: 8px 16px;
  border-left: 4px solid var(--study-accent);
  background: var(--study-code-bg);
  color: var(--study-muted);
}

.markdown-body code {
  background: var(--study-code-bg);
  border-radius: 4px;
  padding: 0.15em 0.4em;
  font-size: 0.92em;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.markdown-body table {
  border-collapse: collapse;
  width: 100%;
}

.markdown-body th,
.markdown-body td {
  border: 1px solid var(--study-border);
  padding: 6px 10px;
}

.code-block {
  margin: 16px 0;
  border: 1px solid var(--study-border);
  border-radius: 8px;
  overflow: hidden;
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--study-code-bg);
  border-bottom: 1px solid var(--study-border);
  padding: 6px 10px;
  font-size: 12px;
}

.code-lang {
  color: var(--study-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.code-actions {
  display: flex;
  gap: 6px;
}

.code-actions button {
  font-size: 12px;
  padding: 4px 10px;
  border: 1px solid var(--study-border);
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
  color: var(--study-fg);
}

.code-actions button:hover {
  border-color: var(--study-accent);
  color: var(--study-accent);
}

.code-actions .run-btn {
  background: var(--study-accent);
  border-color: var(--study-accent);
  color: #fff;
}

.code-actions .run-btn:hover {
  filter: brightness(1.05);
  color: #fff;
}

.code-block .codehilite {
  margin: 0;
  padding: 12px 14px;
  overflow-x: auto;
}

.code-block .codehilite pre {
  margin: 0;
}

.study-footer {
  max-width: 860px;
  margin: 0 auto;
  padding: 20px;
  color: var(--study-muted);
  font-size: 13px;
  border-top: 1px solid var(--study-border);
}