/* AI 오늘의 강의 — 공통 스타일 */

:root {
  --bg: #ffffff;
  --fg: #1a1d21;
  --fg-muted: #6b7280;
  --accent: #2563eb;
  --border: #e5e7eb;
  --surface: #f6f7f9;
  --code-bg: #f3f4f6;
  --code-fg: #1f2937;
  --quote-border: #d1d5db;
  --tag-bg: #eef2ff;
  --tag-fg: #4338ca;
  --summary-bg: #f0f7ff;
  --summary-border: #bfdbfe;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --fg: #e5e7eb;
    --fg-muted: #9ca3af;
    --accent: #7aa7ff;
    --border: #2a2e35;
    --surface: #1c1f24;
    --code-bg: #21252b;
    --code-fg: #d7dae0;
    --quote-border: #3a3f47;
    --tag-bg: #26304d;
    --tag-fg: #aebfff;
    --summary-bg: #1b2536;
    --summary-border: #2e4368;
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  word-break: keep-all;
  overflow-wrap: break-word;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
}

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

a:hover {
  text-decoration: underline;
}

/* 헤더 */
.site-header {
  padding: 40px 0 24px;
  border-bottom: 1px solid var(--border);
}

.site-header .site-title {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.site-header .site-title a {
  color: var(--fg);
}

.site-header .site-desc {
  margin: 6px 0 0;
  color: var(--fg-muted);
  font-size: 0.95rem;
}

/* 글 목록 */
.article-list {
  list-style: none;
  margin: 0;
  padding: 24px 0 60px;
}

.article-list li {
  margin: 0;
}

.article-list .article-item {
  display: block;
  padding: 20px 16px;
  margin: 0 -16px;
  border-radius: 10px;
  color: inherit;
}

.article-list .article-item:hover {
  background: var(--surface);
  text-decoration: none;
}

.article-item .item-date {
  font-size: 0.85rem;
  color: var(--fg-muted);
  font-variant-numeric: tabular-nums;
}

.article-item .item-title {
  margin: 4px 0 6px;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fg);
}

.article-item .item-summary {
  margin: 0 0 10px;
  color: var(--fg-muted);
  font-size: 0.95rem;
}

.empty-state {
  padding: 60px 0;
  text-align: center;
  color: var(--fg-muted);
}

/* 태그 */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--tag-bg);
  color: var(--tag-fg);
  font-size: 0.78rem;
  font-weight: 500;
}

/* 글 페이지 */
.article-header {
  padding: 48px 0 8px;
}

.article-header .article-date {
  font-size: 0.9rem;
  color: var(--fg-muted);
  font-variant-numeric: tabular-nums;
}

.article-header h1 {
  margin: 8px 0 14px;
  font-size: 2rem;
  line-height: 1.35;
  letter-spacing: -0.02em;
  font-weight: 800;
}

.article-body {
  padding-bottom: 40px;
}

.article-body h2 {
  margin: 2.2em 0 0.6em;
  font-size: 1.4rem;
  letter-spacing: -0.01em;
}

.article-body h3 {
  margin: 1.8em 0 0.5em;
  font-size: 1.15rem;
}

.article-body p {
  margin: 0 0 1.1em;
}

.article-body ul,
.article-body ol {
  padding-left: 1.4em;
  margin: 0 0 1.1em;
}

.article-body li {
  margin-bottom: 0.3em;
}

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5em 0;
}

/* 핵심 요약 박스 */
.key-summary {
  margin: 28px 0 36px;
  padding: 18px 22px;
  background: var(--summary-bg);
  border: 1px solid var(--summary-border);
  border-radius: 12px;
}

.key-summary .key-summary-label {
  margin: 0 0 8px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.key-summary ul {
  margin: 0;
  padding-left: 1.2em;
}

.key-summary li {
  margin-bottom: 0.35em;
}

.key-summary li:last-child {
  margin-bottom: 0;
}

/* 코드 */
code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 0.15em 0.4em;
  border-radius: 5px;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  overflow-x: auto;
  line-height: 1.6;
  margin: 0 0 1.3em;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
}

/* 인용구 */
blockquote {
  margin: 1.3em 0;
  padding: 4px 0 4px 18px;
  border-left: 3px solid var(--quote-border);
  color: var(--fg-muted);
}

blockquote p:last-child {
  margin-bottom: 0;
}

/* 표 */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.3em;
  font-size: 0.95rem;
}

th,
td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}

th {
  background: var(--surface);
}

/* 홈으로 돌아가기 */
.back-home {
  display: inline-block;
  margin: 8px 0 64px;
  font-size: 0.95rem;
}

/* 푸터 */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0 48px;
  color: var(--fg-muted);
  font-size: 0.85rem;
}

/* 모바일 */
@media (max-width: 600px) {
  .container {
    padding: 0 16px;
  }

  .site-header {
    padding: 24px 0 18px;
  }

  .article-header h1 {
    font-size: 1.5rem;
  }

  .article-body h2 {
    font-size: 1.25rem;
  }

  .key-summary {
    padding: 14px 16px;
  }

  pre {
    padding: 12px 14px;
  }

  table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}