/* ChordSticker 정적 콘텐츠 페이지 공통 스타일.
   앱(src/styles/variables.css)과 동일한 토큰을 사용해 톤을 맞춘다. */

:root {
  --color-primary: #007bff;
  --color-primary-hover: #0069d9;
  --color-bg: #f1f3f5;
  --color-surface: #ffffff;
  --color-surface-muted: #f8f9fa;
  --color-border: #dee2e6;
  --color-text: #212529;
  --color-text-muted: #6c757d;
  --color-highlight: #fff3cd;
  --font-sans: 'Pretendard', 'Apple SD Gothic Neo', 'Malgun Gothic', 'Segoe UI',
    system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, 'Cascadia Code', Consolas, monospace;
  --page-max: 780px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
  overflow-wrap: break-word;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-primary);
}

a:hover {
  color: var(--color-primary-hover);
}

/* ---------- 헤더 ---------- */

.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-header__inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
}

.site-header__brand {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text);
  text-decoration: none;
}

.site-header__brand span {
  color: var(--color-primary);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  margin-left: auto;
}

.site-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  padding: 4px 0;
}

.site-nav a:hover,
.site-nav a[aria-current='page'] {
  color: var(--color-primary);
}

/* ---------- 본문 레이아웃 ---------- */

.page {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 32px 20px 72px;
}

.page--wide {
  max-width: 1080px;
}

.breadcrumb {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.breadcrumb a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.breadcrumb span {
  margin: 0 6px;
  opacity: 0.5;
}

.page-head {
  margin-bottom: 32px;
}

.page-head .kicker {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.page-head h1 {
  font-size: clamp(26px, 4.5vw, 38px);
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}

.page-head .lede {
  font-size: 17px;
  color: var(--color-text-muted);
  margin: 0;
}

.page-meta {
  margin-top: 16px;
  font-size: 13px;
  color: var(--color-text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-meta .tag {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 2px 10px;
}

/* ---------- 아티클 본문 ---------- */

.prose {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 32px clamp(20px, 4vw, 40px);
}

.prose > *:first-child {
  margin-top: 0;
}

.prose > *:last-child {
  margin-bottom: 0;
}

.prose h2 {
  font-size: 24px;
  letter-spacing: -0.02em;
  margin: 44px 0 14px;
  padding-top: 14px;
  border-top: 2px solid var(--color-border);
}

.prose h3 {
  font-size: 19px;
  margin: 30px 0 10px;
}

.prose h4 {
  font-size: 16px;
  margin: 22px 0 8px;
  color: var(--color-text-muted);
}

.prose p {
  margin: 0 0 16px;
}

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

.prose li {
  margin-bottom: 8px;
}

.prose li > ul,
.prose li > ol {
  margin-top: 8px;
}

.prose strong {
  font-weight: 700;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-surface-muted);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 1px 5px;
}

.prose pre {
  background: #1e2125;
  color: #e9ecef;
  border-radius: 10px;
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  margin: 0 0 20px;
}

.prose pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.prose blockquote {
  margin: 0 0 20px;
  padding: 4px 18px;
  border-left: 4px solid var(--color-primary);
  background: var(--color-surface-muted);
  color: var(--color-text-muted);
}

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

.table-scroll {
  overflow-x: auto;
  margin: 0 0 22px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
}

.prose table {
  border-collapse: collapse;
  width: 100%;
  min-width: 460px;
  font-size: 15px;
}

.prose th,
.prose td {
  border-bottom: 1px solid var(--color-border);
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
}

.prose thead th {
  background: var(--color-surface-muted);
  font-weight: 700;
  white-space: nowrap;
}

.prose tbody tr:last-child th,
.prose tbody tr:last-child td {
  border-bottom: none;
}

.callout {
  background: var(--color-highlight);
  border: 1px solid #ffe49a;
  border-radius: 10px;
  padding: 16px 20px;
  margin: 0 0 22px;
}

.callout p:last-child {
  margin-bottom: 0;
}

.callout strong {
  display: block;
  margin-bottom: 4px;
}

/* ---------- 목차 ---------- */

.toc {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 24px;
}

.toc h2 {
  font-size: 15px;
  margin: 0 0 10px;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

.toc ol {
  margin: 0;
  padding-left: 20px;
  font-size: 15px;
}

.toc li {
  margin-bottom: 4px;
}

.toc a {
  text-decoration: none;
}

.toc a:hover {
  text-decoration: underline;
}

/* ---------- 카드 목록 ---------- */

.card-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  margin: 0 0 32px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

a.card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.card__kicker {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-primary);
  text-transform: uppercase;
}

.card h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.card p {
  margin: 0;
  font-size: 15px;
  color: var(--color-text-muted);
}

.card__meta {
  margin-top: auto;
  padding-top: 6px;
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ---------- 다음 글 / CTA ---------- */

.next-links {
  margin-top: 32px;
}

.next-links h2 {
  font-size: 18px;
  margin: 0 0 14px;
}

.cta-band {
  margin-top: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: 12px;
  padding: 24px 28px;
}

.cta-band h2 {
  margin: 0 0 8px;
  font-size: 20px;
}

.cta-band p {
  margin: 0 0 16px;
  color: var(--color-text-muted);
}

.button {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  padding: 11px 22px;
  border-radius: 8px;
}

.button:hover {
  background: var(--color-primary-hover);
  color: #fff;
}

.button--ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.button--ghost:hover {
  background: var(--color-surface-muted);
  color: var(--color-primary-hover);
}

/* ---------- 푸터 ---------- */

.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 40px 20px;
}

.site-footer__inner {
  max-width: 1080px;
  margin: 0 auto;
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(240px, 1fr) auto;
  align-items: start;
}

.site-footer__about strong {
  display: block;
  font-size: 16px;
  margin-bottom: 6px;
}

.site-footer__about p {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--color-text-muted);
  max-width: 46ch;
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  max-width: 420px;
}

.site-footer__links a {
  font-size: 14px;
  color: var(--color-text-muted);
  text-decoration: none;
}

.site-footer__links a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.site-footer__legal {
  grid-column: 1 / -1;
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
  font-size: 13px;
  color: var(--color-text-muted);
}

@media (max-width: 640px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
  }

  .site-header__inner {
    padding: 12px 16px;
  }

  .site-nav {
    margin-left: 0;
    width: 100%;
  }

  .prose {
    padding: 24px 18px;
  }
}