/* Simple Systems Blog — Shared Stylesheet */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --black:      #1A1A1A;
  --white:      #FFFFFF;
  --off-white:  #F5F5F5;
  --mid-gray:   #888888;
  --light-gray: #E0E0E0;
  --border:     var(--light-gray);
  --font: 'Outfit', sans-serif;
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.5rem;
  --text-2xl:  2rem;
  --text-3xl:  3rem;
  --tracking-tight:  -0.02em;
  --tracking-wide:    0.08em;
  --tracking-widest:  0.15em;
  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  2rem;
  --space-lg:  4rem;
  --space-xl:  6rem;
}

html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--black); background: var(--white); overflow-x: hidden; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 clamp(1.5rem, 5vw, 4rem); }
.article-container { max-width: 720px; margin: 0 auto; padding: 0 clamp(1.5rem, 5vw, 4rem); }

/* NAV */
.nav {
  position: fixed; top: 0; width: 100%;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(8px);
  z-index: 200;
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; }
.nav__logo { font-family: var(--font); font-size: var(--text-xl); text-decoration: none; color: var(--black); letter-spacing: var(--tracking-tight); line-height: 1; }
.nav__logo strong { font-weight: 700; }
.nav__logo span   { font-weight: 300; }
.nav__right { display: flex; align-items: center; gap: var(--space-md); }
.nav__links { display: flex; gap: var(--space-md); list-style: none; }
.nav__links a { font-family: var(--font); font-weight: 300; font-size: var(--text-xs); color: var(--black); text-decoration: none; letter-spacing: var(--tracking-wide); text-transform: uppercase; opacity: 0.6; transition: opacity 0.2s; }
.nav__links a:hover { opacity: 1; }

/* BUTTONS */
.btn { font-family: var(--font); font-weight: 700; font-size: var(--text-sm); letter-spacing: var(--tracking-wide); text-transform: uppercase; text-decoration: none; display: inline-flex; align-items: center; padding: 0.875rem 2rem; border: 2px solid transparent; cursor: pointer; transition: all 0.2s; white-space: nowrap; }
.btn--primary { background: var(--black); color: var(--white); border-color: var(--black); }
.btn--primary:hover { background: transparent; color: var(--black); }
.btn--ghost { background: transparent; color: var(--black); border-color: rgba(0,0,0,0.25); }
.btn--ghost:hover { border-color: var(--black); }
.btn--white { background: var(--white); color: var(--black); border-color: var(--white); }
.btn--white:hover { background: transparent; color: var(--white); }
.btn--sm { padding: 0.5rem 1.25rem; font-size: var(--text-xs); }

/* ARTICLE HEADER */
.article-header {
  padding: calc(80px + var(--space-xl)) 0 var(--space-lg);
  border-bottom: 1px solid var(--border);
}
.article-header__tag { font-weight: 300; font-size: var(--text-xs); letter-spacing: var(--tracking-widest); text-transform: uppercase; color: var(--mid-gray); margin-bottom: var(--space-sm); }
.article-header__title { font-weight: 700; font-size: clamp(2rem, 5vw, 3.5rem); letter-spacing: var(--tracking-tight); line-height: 1.05; margin-bottom: var(--space-md); }
.article-header__meta { font-weight: 300; font-size: var(--text-sm); color: var(--mid-gray); display: flex; gap: var(--space-md); }

/* ARTICLE BODY */
.article-body {
  padding: var(--space-xl) 0;
}
.article-body h2 {
  font-weight: 700;
  font-size: var(--text-2xl);
  letter-spacing: var(--tracking-tight);
  line-height: 1.1;
  margin: var(--space-lg) 0 var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
}
.article-body h3 {
  font-weight: 700;
  font-size: var(--text-xl);
  letter-spacing: var(--tracking-tight);
  margin: var(--space-md) 0 var(--space-sm);
}
.article-body p {
  font-weight: 300;
  font-size: var(--text-base);
  line-height: 1.75;
  color: var(--black);
  margin-bottom: var(--space-sm);
}
.article-body ul, .article-body ol {
  margin: var(--space-sm) 0 var(--space-md) var(--space-md);
}
.article-body li {
  font-weight: 300;
  font-size: var(--text-base);
  line-height: 1.7;
  margin-bottom: var(--space-xs);
  color: var(--black);
}
.article-body strong { font-weight: 700; }
.article-body blockquote {
  border-left: 3px solid var(--black);
  padding: var(--space-sm) var(--space-md);
  margin: var(--space-md) 0;
  background: var(--off-white);
}
.article-body blockquote p { margin-bottom: 0; font-weight: 400; }

/* RESULT CALLOUT */
.result-callout {
  background: var(--black);
  color: var(--white);
  padding: var(--space-md);
  margin: var(--space-lg) 0;
}
.result-callout__label { font-weight: 300; font-size: var(--text-xs); letter-spacing: var(--tracking-widest); text-transform: uppercase; color: rgba(255,255,255,0.4); margin-bottom: var(--space-xs); }
.result-callout__number { font-weight: 700; font-size: var(--text-3xl); letter-spacing: var(--tracking-tight); line-height: 1; }
.result-callout__desc { font-weight: 300; font-size: var(--text-sm); color: rgba(255,255,255,0.5); margin-top: var(--space-xs); }

/* ARTICLE CTA */
.article-cta {
  background: var(--black);
  color: var(--white);
  padding: var(--space-xl) 0;
  margin-top: var(--space-xl);
}
.article-cta__label { font-weight: 300; font-size: var(--text-xs); letter-spacing: var(--tracking-widest); text-transform: uppercase; color: rgba(255,255,255,0.4); margin-bottom: var(--space-sm); }
.article-cta__heading { font-weight: 700; font-size: var(--text-3xl); letter-spacing: var(--tracking-tight); line-height: 1.05; margin-bottom: var(--space-sm); }
.article-cta__sub { font-weight: 300; font-size: var(--text-base); color: rgba(255,255,255,0.5); max-width: 560px; line-height: 1.6; margin-bottom: var(--space-lg); }
.article-cta__actions { display: flex; gap: var(--space-sm); }

/* FOOTER */
.footer { background: var(--black); color: var(--white); padding: var(--space-xl) 0; border-top: 1px solid rgba(255,255,255,0.08); }
.footer__inner { display: flex; justify-content: space-between; align-items: flex-end; }
.footer__logo { font-family: var(--font); font-size: var(--text-xl); text-decoration: none; color: var(--white); letter-spacing: var(--tracking-tight); display: block; margin-bottom: var(--space-sm); }
.footer__logo strong { font-weight: 700; }
.footer__logo span   { font-weight: 300; }
.footer__tagline { font-weight: 300; font-size: var(--text-sm); color: rgba(255,255,255,0.35); max-width: 300px; line-height: 1.5; }
.footer__nav { display: flex; flex-direction: column; align-items: flex-end; gap: var(--space-sm); }
.footer__links { list-style: none; display: flex; gap: var(--space-md); }
.footer__links a { font-weight: 300; font-size: var(--text-xs); letter-spacing: var(--tracking-wide); text-transform: uppercase; color: rgba(255,255,255,0.4); text-decoration: none; transition: color 0.2s; }
.footer__links a:hover { color: var(--white); }
.footer__copy { font-weight: 300; font-size: var(--text-xs); letter-spacing: var(--tracking-wide); text-transform: uppercase; color: rgba(255,255,255,0.25); }

/* RELATED ARTICLES */
.related-section { padding: var(--space-xl) 0; border-top: 1px solid var(--border); }
.related-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0; border-top: 1px solid var(--border); border-left: 1px solid var(--border); margin-top: var(--space-md); }
.related-card { background: var(--white); border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: var(--space-md); text-decoration: none; color: var(--black); display: block; transition: background 0.15s; }
.related-card:hover { background: var(--off-white); }
.related-card__tag { font-weight: 300; font-size: var(--text-xs); letter-spacing: var(--tracking-wide); text-transform: uppercase; color: var(--mid-gray); margin-bottom: var(--space-sm); }
.related-card__title { font-weight: 700; font-size: var(--text-lg); line-height: 1.2; letter-spacing: var(--tracking-tight); }

/* MOBILE */
@media (max-width: 768px) {
  .nav__links { display: none; }
  .footer__inner { flex-direction: column; gap: var(--space-md); align-items: flex-start; }
  .footer__nav { align-items: flex-start; }
  .related-grid { grid-template-columns: 1fr; }
  .article-cta__actions { flex-direction: column; }
}