/* ============ RESET & TOKENS (shared with the main site) ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #07070c;
  --bg-1: #0b0b14;
  --bg-2: #11111d;
  --surface: rgba(255, 255, 255, 0.03);
  --surface-2: rgba(255, 255, 255, 0.05);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --text: #ECECF1;
  --text-2: #B4B4C7;
  --muted: #7A7A92;
  --accent: #8B5CF6;
  --accent-2: #2DD4BF;
  --accent-3: #F472B6;
  --glow: rgba(139, 92, 246, 0.45);
  --max: 1200px;
  --content: 720px;
  --radius: 18px;
  --radius-sm: 12px;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
}
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; }
button, a, [role="button"] { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 3px; }
::selection { background: var(--accent); color: #fff; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.grad {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
[hidden] { display: none !important; }

/* ============ NAV ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  background: rgba(7, 7, 12, 0.85);
  border-bottom: 1px solid var(--border);
}
.nav__inner { max-width: var(--max); margin: 0 auto; padding: 14px 24px; display: flex; align-items: center; justify-content: space-between; }
.brand { font-family: var(--font-display); font-weight: 700; font-size: 17px; letter-spacing: -0.01em; display: flex; align-items: center; gap: 10px; }
.brand__mark { width: 27px; height: 27px; border-radius: 7px; }
.nav__right { display: flex; align-items: center; gap: 20px; }
.nav__links { display: flex; gap: 24px; align-items: center; }
.nav__links a { font-size: 14px; color: var(--text-2); transition: color .2s; }
.nav__links a:hover { color: var(--text); }
.nav__cta { padding: 9px 18px; border-radius: 100px; background: var(--text); color: var(--bg) !important; font-weight: 600; font-size: 14px; transition: transform .2s, box-shadow .2s; }
.nav__cta:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(255,255,255,0.15); }
@media (max-width: 640px) { .nav__links a:not(.nav__cta) { display: none; } }

/* ---- Language toggle (pill segmented control), shared with the main site ---- */
.lang-toggle { position: relative; display: inline-flex; align-items: center; background: var(--surface-2); border: 1px solid var(--border); border-radius: 100px; padding: 3px; flex-shrink: 0; }
.lang-toggle__thumb { position: absolute; top: 3px; left: 3px; width: calc(50% - 3px); height: calc(100% - 6px); border-radius: 100px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); transition: transform .3s cubic-bezier(.65,0,.35,1); z-index: 0; }
.lang-toggle[data-lang="th"] .lang-toggle__thumb { transform: translateX(100%); }
.lang-toggle__btn { position: relative; z-index: 1; width: 34px; padding: 6px 0; background: none; border: none; cursor: pointer; font-family: var(--font-mono); font-size: 11.5px; font-weight: 700; letter-spacing: 0.04em; color: var(--muted); transition: color .25s; }
.lang-toggle__btn.active { color: #fff; }
.lang-toggle__btn:hover:not(.active) { color: var(--text-2); }

/* ============ ARTICLE / PAGE LAYOUT ============ */
main { padding: 140px 0 100px; }
.article__header { max-width: var(--content); margin: 0 auto 48px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: 12.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent-2); margin-bottom: 18px; }
.eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--accent-2); }
.article__title { font-family: var(--font-display); font-size: clamp(30px, 4.5vw, 46px); font-weight: 700; letter-spacing: -0.02em; line-height: 1.15; margin-bottom: 18px; }
.article__meta { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; font-size: 13.5px; color: var(--muted); font-family: var(--font-mono); }
.article__meta .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--muted); }
.article__lead { font-size: 18px; color: var(--text-2); margin-top: 20px; line-height: 1.65; }

.prose { max-width: var(--content); margin: 0 auto; font-size: 17px; color: var(--text-2); }
.prose h2 { font-family: var(--font-display); font-size: 26px; font-weight: 700; color: var(--text); letter-spacing: -0.01em; margin: 44px 0 16px; }
.prose h3 { font-family: var(--font-display); font-size: 20px; font-weight: 600; color: var(--text); margin: 32px 0 12px; }
.prose p { margin-bottom: 18px; }
.prose ul, .prose ol { margin: 0 0 18px 22px; }
.prose li { margin-bottom: 10px; }
.prose strong { color: var(--text); font-weight: 600; }
.prose a:not(.btn) { color: var(--accent-2); text-decoration: underline; text-underline-offset: 3px; }
.prose blockquote { border-left: 2px solid var(--accent); padding: 4px 0 4px 20px; margin: 28px 0; color: var(--text); font-style: italic; }
.prose .callout {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 20px 22px; margin: 28px 0; font-size: 15.5px;
}
.prose .callout strong { display: block; color: var(--accent-2); font-family: var(--font-mono); font-size: 12.5px; letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 8px; }

/* CTA block at the end of each article */
.article__cta {
  max-width: var(--content); margin: 56px auto 0;
  background: linear-gradient(160deg, var(--bg-2), var(--bg-1));
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px; text-align: center;
}
.article__cta h3 { font-family: var(--font-display); font-size: 22px; margin-bottom: 10px; }
.article__cta p { color: var(--text-2); margin-bottom: 20px; font-size: 15px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 13px 26px; border-radius: 100px; font-weight: 600; font-size: 14.5px; transition: transform .2s, box-shadow .2s; }
.btn--primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px -8px var(--glow); }

/* Back link + related articles */
.back-link { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; color: var(--muted); margin-bottom: 28px; transition: color .2s; }
.back-link:hover { color: var(--text); }
.related { max-width: var(--content); margin: 64px auto 0; padding-top: 40px; border-top: 1px solid var(--border); }
.related h4 { font-family: var(--font-mono); font-size: 12.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 18px; }
.related__grid { display: grid; gap: 14px; }
.related__item { display: block; padding: 16px 18px; border: 1px solid var(--border); border-radius: var(--radius-sm); transition: border-color .2s, transform .2s; }
.related__item:hover { border-color: var(--border-strong); transform: translateX(4px); }
.related__item .t { font-weight: 600; color: var(--text); margin-bottom: 4px; }
.related__item .d { font-size: 13.5px; color: var(--muted); }

/* ============ BLOG INDEX ============ */
.blog-hero { max-width: var(--content); margin: 0 auto 56px; }
.blog-hero h1 { font-family: var(--font-display); font-size: clamp(32px, 5vw, 48px); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 16px; }
.blog-hero p { font-size: 17px; color: var(--text-2); }
.post-list { max-width: var(--content); margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.post-card { display: block; padding: 26px 28px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); transition: border-color .2s, transform .2s; }
.post-card:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.post-card__cat { font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent-2); margin-bottom: 10px; }
.post-card__title { font-family: var(--font-display); font-size: 21px; font-weight: 700; margin-bottom: 8px; letter-spacing: -0.01em; }
.post-card__excerpt { font-size: 14.5px; color: var(--text-2); margin-bottom: 12px; }
.post-card__meta { font-size: 12.5px; color: var(--muted); font-family: var(--font-mono); }

/* ============ CASE STUDY PAGES ============ */
.case-hero-img { width: 100%; border-radius: var(--radius); border: 1px solid var(--border); margin: 28px 0 8px; }
.case-meta {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  margin: 28px 0; padding: 20px; border-radius: var(--radius-sm);
  background: var(--surface); border: 1px solid var(--border);
}
.case-meta-item { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.case-meta-label { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.case-meta-value { font-size: 14px; font-weight: 500; color: var(--text); word-break: break-word; }
.case-meta-value a { color: var(--accent-2); text-decoration: underline; text-underline-offset: 3px; }
.tag {
  font-family: var(--font-mono); font-size: 12px; padding: 6px 11px;
  border-radius: 8px; background: rgba(255,255,255,0.04);
  border: 1px solid var(--border); color: var(--text-2);
}
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 28px; }
@media (max-width: 640px) { .case-meta { grid-template-columns: 1fr 1fr; } }

footer { border-top: 1px solid var(--border); padding: 32px 0; }
footer .wrap { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 13px; color: var(--muted); }
footer a:hover { color: var(--text); }

@media (max-width: 640px) {
  main { padding: 120px 0 70px; }
  .article__cta { padding: 26px 20px; }
}