/* =========================================================
   Arirang Insight — Live Site Stylesheet (deploy/cloudflare-pages)
   Aesthetic: calm Korea healthcare intelligence —
   Korean red accent, Reuters serif headings, light/dark themes.
   ========================================================= */

:root, [data-theme="light"] {
  --bg:           #ffffff;
  --bg-card:      #fbfaf7;
  --bg-muted:     #f7f6f3;
  --ink:          #111418;
  --ink-soft:     #3a3f47;
  --ink-muted:    #6b6f76;
  --border:       #e6e3dc;
  --border-soft:  #efece6;
  --accent:       #8b1e1e;          /* Korean red */
  --accent-dark:  #6b1414;
  --accent-soft:  #f3e4e4;
  --navy:         #0a2540;
  --link:         #0a2540;
  --link-hover:   #8b1e1e;
  --link-underline: rgba(10, 37, 64, 0.22);
  --serif:        Georgia, "Source Serif Pro", "Times New Roman", serif;
  --sans:         -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, Helvetica, Arial, sans-serif;
  --measure:      64ch;
  --space:        clamp(1rem, 2vw, 1.5rem);
  color-scheme: light;
}

[data-theme="dark"] {
  --bg:           #0e1014;
  --bg-card:      #161a20;
  --bg-muted:     #16191f;
  --ink:          #ebe9e3;
  --ink-soft:     #c3c1bb;
  --ink-muted:    #8a8780;
  --border:       #2a2e36;
  --border-soft:  #232730;
  --accent:       #d65b5b;
  --accent-dark:  #c14a4a;
  --accent-soft:  #2a1414;
  --navy:         #9cb6d6;
  --link:         #9cb6d6;
  --link-hover:   #d65b5b;
  --link-underline: rgba(156, 182, 214, 0.3);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--ink);
  font-family: var(--sans);
  font-size: 17px; line-height: 1.65; font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: background-color 0.25s ease, color 0.25s ease;
}

a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid var(--link-underline);
  transition: color 0.15s ease, border-color 0.15s ease;
}
a:hover { color: var(--link-hover); border-bottom-color: var(--link-hover); }

article.post, header.site, .pill, .reset-callout {
  transition: background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

/* =========================================================
   Layout wrappers
   ========================================================= */
.wrap { max-width: 900px; margin: 0 auto; padding: 0 var(--space); }
.wrap-wide { max-width: 1080px; margin: 0 auto; padding: 0 var(--space); }

/* =========================================================
   Header / Navigation
   ========================================================= */
header.site {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 0; gap: 24px; flex-wrap: wrap;
}
.brand {
  font-family: var(--serif); font-weight: 700;
  font-size: 1.45rem; letter-spacing: -0.01em;
  color: var(--ink); border: none;
}
.brand .dot { color: var(--accent); }
.brand-tag {
  font-size: 12px; text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--ink-muted); margin-left: 10px;
}
.nav-right { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.nav-link {
  font-size: 0.84rem; text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--ink-soft); border: none;
}
.nav-link:hover { color: var(--accent); }

/* Language switcher (sits next to theme toggle) */
.lang-switcher { position: relative; display: inline-block; }
.lang-toggle {
  appearance: none;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  height: 38px; padding: 0 12px;
  display: inline-flex; align-items: center; gap: 6px;
  cursor: pointer; color: var(--ink-soft);
  font: 600 0.78rem/1 var(--sans);
  letter-spacing: 0.08em; text-transform: uppercase;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}
.lang-toggle:hover {
  color: var(--accent); border-color: var(--accent); background-color: var(--bg-muted);
}
.lang-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.lang-toggle svg { display: block; width: 12px; height: 12px; opacity: 0.6; }
.lang-menu {
  position: absolute; top: calc(100% + 6px); right: 0;
  min-width: 180px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  list-style: none; margin: 0; padding: 6px 0;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  opacity: 0; transform: translateY(-4px); pointer-events: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
  z-index: 50;
}
.lang-switcher.open .lang-menu {
  opacity: 1; transform: translateY(0); pointer-events: auto;
}
.lang-menu li { margin: 0; }
.lang-menu a {
  display: block; padding: 8px 14px;
  font: 500 0.92rem/1.3 var(--sans);
  color: var(--ink-soft); border: none; text-decoration: none;
  letter-spacing: normal; text-transform: none;
}
.lang-menu a:hover { background: var(--bg-muted); color: var(--accent); }
.lang-menu li.current a { color: var(--accent); font-weight: 700; }
.lang-menu li.current a::after { content: " ✓"; opacity: 0.7; }

/* Theme toggle button */
.theme-toggle {
  appearance: none;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  width: 38px; height: 38px;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--ink-soft); padding: 0;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}
.theme-toggle:hover {
  color: var(--accent); border-color: var(--accent); background-color: var(--bg-muted);
}
.theme-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.theme-toggle svg { display: block; }
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* =========================================================
   Hero
   ========================================================= */
.hero { padding: 72px 0 56px; border-bottom: 1px solid var(--border); background: var(--bg-muted); }
.hero .eyebrow {
  font-size: 0.78rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--accent); font-weight: 600; margin-bottom: 18px;
}
.hero h1 {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(2rem, 5vw, 3rem); line-height: 1.15;
  letter-spacing: -0.015em; margin: 0 0 22px;
  color: var(--ink); max-width: 26ch;
}
.hero p {
  font-size: 1.08rem; line-height: 1.6; color: var(--ink-soft);
  max-width: 60ch; margin: 0;
}

/* =========================================================
   Main + section labels
   ========================================================= */
main { padding: 56px 0 24px; }
.section-label {
  font-size: 0.78rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--ink-muted); font-weight: 600; margin-bottom: 28px;
}

/* =========================================================
   Post cards (article.post) — used by both index.html and archive.html
   ========================================================= */
article.post {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: clamp(28px, 4vw, 48px);
  margin-bottom: 32px;
}
article.post .meta {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  font-size: 0.82rem; color: var(--ink-muted); margin-bottom: 20px;
}
.pill {
  display: inline-block; padding: 4px 10px;
  background: var(--accent-soft); color: var(--accent);
  border-radius: 999px; font-weight: 600;
  letter-spacing: 0.04em; font-size: 0.74rem; text-transform: uppercase;
}
.meta .dot-sep {
  width: 3px; height: 3px; background: var(--ink-muted);
  border-radius: 50%; display: inline-block; opacity: 0.6;
}
article.post h2 {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(1.6rem, 3.6vw, 2.15rem); line-height: 1.2;
  letter-spacing: -0.012em; margin: 0 0 10px; color: var(--ink);
}
article.post .summary {
  font-family: var(--serif); font-style: italic; font-weight: 400;
  font-size: 1.08rem; line-height: 1.55; color: var(--ink-soft);
  margin: 0 0 28px; max-width: 58ch;
}
article.post .body { max-width: var(--measure); }
article.post .body h3 {
  font-family: var(--sans); text-transform: uppercase; letter-spacing: 0.14em;
  font-size: 0.74rem; color: var(--accent); font-weight: 700;
  margin: 32px 0 10px;
}
article.post .body h3:first-child { margin-top: 0; }
article.post .body p { margin: 0 0 14px; color: var(--ink-soft); }
article.post .body p strong { color: var(--ink); }
article.post .body ul, article.post .body ol {
  margin: 0 0 16px; padding-left: 22px; color: var(--ink-soft);
}
article.post .body li { margin-bottom: 6px; }

/* Key Takeaway callout (reuses .reset-callout class from skill template) */
article.post .reset-callout {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding: 20px 24px; margin: 24px 0;
  border-radius: 0 4px 4px 0;
}
article.post .reset-callout h3 {
  color: var(--accent-dark); margin: 0 0 8px;
}
[data-theme="dark"] article.post .reset-callout h3 { color: var(--accent); }
article.post .reset-callout p { margin: 0; color: var(--ink); }

/* Sources block (reuses .reference class from skill template) */
article.post .reference {
  margin-top: 36px; padding-top: 22px;
  border-top: 1px solid var(--border-soft);
  font-size: 0.86rem; line-height: 1.55; color: var(--ink-soft);
  max-width: var(--measure);
}
article.post .reference .ref-label {
  display: block; font-family: var(--sans);
  text-transform: uppercase; letter-spacing: 0.14em;
  font-size: 0.72rem; color: var(--ink-muted); font-weight: 700;
  margin-bottom: 10px;
}
article.post .reference ul { list-style: none; padding: 0; margin: 0; }
article.post .reference li {
  margin-bottom: 8px; padding-left: 16px; position: relative;
}
article.post .reference li::before {
  content: "→"; position: absolute; left: 0; color: var(--accent);
}
article.post .reference em { font-style: italic; }

/* =========================================================
   Keywords sidebar (right rail on each post card)
   ========================================================= */
main.with-rail > .wrap { max-width: 1080px; }

article.post .body-grid { display: block; }
article.post .body-grid > .body { max-width: var(--measure); }

@media (min-width: 900px) {
  article.post .body-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 220px;
    gap: 48px;
    align-items: start;
  }
  article.post .body-grid > .body {
    max-width: 64ch;
    min-width: 0;
  }
  article.post .keywords {
    position: sticky;
    top: 24px;
  }
}

article.post .keywords { font-family: var(--sans); }
article.post .keywords .kw-label {
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  color: var(--ink-muted);
  font-weight: 700;
  margin-bottom: 12px;
}
article.post .keywords .kw-group + .kw-group { margin-top: 16px; }
article.post .keywords .kw-group-label {
  display: block;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-muted);
  font-weight: 600;
  opacity: 0.78;
  margin-bottom: 8px;
}
article.post .keywords ul {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 6px;
}
article.post .keywords li {
  display: inline-block;
  padding: 4px 10px;
  background: var(--bg-muted);
  color: var(--ink-soft);
  border: 1px solid var(--border-soft);
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  line-height: 1.4;
}
[data-theme="dark"] article.post .keywords li {
  background: rgba(255,255,255,0.03);
}
@media (max-width: 900px) {
  article.post .keywords { margin-bottom: 24px; }
}

/* =========================================================
   Preview cards (translation stubs that link back to English)
   ========================================================= */
article.post.post-card {
  background: var(--bg-muted);
  border-style: dashed;
  border-color: var(--border-soft);
}
article.post.post-card h2 {
  font-size: clamp(1.3rem, 2.8vw, 1.7rem);
}
article.post.post-card .reference {
  margin-top: 12px; padding-top: 12px;
}
article.post.post-card .reference a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent-soft);
}

/* =========================================================
   Empty state + archive link
   ========================================================= */
.empty-state {
  text-align: center; padding: 60px 20px;
  color: var(--ink-muted); font-style: italic; font-family: var(--serif);
}
.archive-link { text-align: center; margin: 8px 0 56px; }
.archive-link a {
  display: inline-block; padding: 10px 22px;
  border: 1px solid var(--accent); color: var(--accent);
  border-radius: 999px; font-weight: 500; font-size: 0.92rem;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}
.archive-link a:hover { background: var(--accent); color: var(--bg); }

/* =========================================================
   About section (homepage inline)
   ========================================================= */
.about {
  margin-top: 24px; padding: 56px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.about-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 48px; }
.about h2 {
  font-family: var(--serif); font-weight: 400;
  font-size: 1.6rem; line-height: 1.25; margin: 0; color: var(--ink);
}
.about p { margin: 0 0 14px; color: var(--ink-soft); max-width: 60ch; }
.about p:last-child { margin-bottom: 0; }
@media (max-width: 720px) { .about-grid { grid-template-columns: 1fr; gap: 20px; } }

/* =========================================================
   Footer
   ========================================================= */
footer.site {
  padding: 48px 0 64px; color: var(--ink-muted);
  font-size: 0.86rem;
}
footer.site .row {
  display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap;
}
footer.site p { margin: 0; max-width: 50ch; }

/* =========================================================
   Reduced motion
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 640px) {
  .hero { padding: 56px 0 40px; }
  .hero h1 { font-size: 2rem; }
  .brand-tag { display: none; }
  .nav { padding: 16px 0; }
  article.post { padding: 24px; }
}