/* ── carlosfc.com — shared design system ── */
:root {
  --bg:        #F7F4EF;
  --bg2:       #EDEAE3;
  --ink:       #1A1814;
  --ink2:      #6B6760;
  --ink3:      #9E9B96;
  --accent:    #1A3A5C;
  --accent-l:  #E8EFF7;
  --accent2:   #C4622D;
  --accent2-l: #FAF0EA;
  --line:      rgba(26,24,20,0.10);
  --serif:     'Instrument Serif', Georgia, serif;
  --sans:      'DM Sans', sans-serif;
  --r:         12px;
  --rsm:       6px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
}

/* ── NAV ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 2rem;
  background: rgba(247,244,239,0.95);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-logo {
  font-family: var(--serif);
  font-size: 20px; color: var(--ink);
  text-decoration: none; letter-spacing: -0.01em;
  display: flex; align-items: baseline; gap: 5px;
  flex-shrink: 0;
}
.nav-logo em { font-style: italic; }
.nav-logo sup {
  font-family: var(--sans); font-size: 9px; font-weight: 400;
  color: var(--ink3); letter-spacing: 0.05em; text-transform: uppercase;
  margin-left: 3px;
}
.nav-links {
  display: flex; align-items: center; gap: 1.5rem; list-style: none;
}
.nav-links a {
  font-size: 13px; font-weight: 400;
  color: var(--ink2); text-decoration: none;
  white-space: nowrap; transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--ink); }
.nav-cta {
  color: var(--accent) !important;
  border: 1px solid var(--accent);
  padding: 6px 14px; border-radius: 20px;
  transition: background 0.2s, color 0.2s !important;
}
.nav-cta:hover { background: var(--accent) !important; color: #fff !important; }

/* ── FOOTER ── */
footer {
  padding: 2rem 3rem;
  border-top: 1px solid var(--line);
  display: flex; align-items: center; justify-content: space-between;
  font-size: 12px; color: var(--ink3);
  margin-top: auto;
}
footer em { font-family: var(--serif); font-style: italic; color: var(--ink2); }

/* ── BUTTONS ── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--sans); font-size: 13px; font-weight: 500;
  text-decoration: none; cursor: pointer;
  border: none; outline: none; transition: all 0.2s;
}
.btn-dark { background: var(--ink); color: #fff; padding: 11px 22px; border-radius: 24px; }
.btn-dark:hover { background: var(--accent); }
.btn-outline {
  background: transparent; color: var(--ink);
  padding: 10px 22px; border-radius: 24px;
  border: 1px solid rgba(26,24,20,0.25);
}
.btn-outline:hover { border-color: var(--ink); }

/* ── SECTION COMMONS ── */
.page-body { padding-top: 64px; min-height: 100vh; display: flex; flex-direction: column; }
section { padding: 5rem 3rem; }
.section-header {
  display: flex; align-items: baseline; gap: 1rem;
  margin-bottom: 3rem;
  border-top: 1px solid var(--line); padding-top: 1.5rem;
}
.section-num { font-family: var(--serif); font-style: italic; font-size: 13px; color: var(--ink3); min-width: 28px; }
.section-title { font-family: var(--serif); font-size: clamp(26px, 4vw, 40px); font-weight: 400; letter-spacing: -0.02em; line-height: 1.15; }
.section-title em { font-style: italic; color: var(--accent); }

/* ── TAGS ── */
.tag { font-size: 12px; font-weight: 400; padding: 5px 13px; border-radius: 20px; background: var(--bg2); color: var(--ink2); border: 1px solid var(--line); display: inline-block; }
.tag.a1 { background: var(--accent-l); color: var(--accent); border-color: transparent; }
.tag.a2 { background: var(--accent2-l); color: var(--accent2); border-color: transparent; }

/* ── FADE-UP: visible by default so content shows if JS fails or is slow ── */
.fade-up { opacity: 1; transform: none; }
.js-ready .fade-up { opacity: 0; transform: translateY(22px); transition: opacity 0.6s ease, transform 0.6s ease; }
.js-ready .fade-up.visible { opacity: 1; transform: none; }

/* ── ARTICLE PAGE ── */
.article-hero { padding: 5rem 3rem 3rem; border-bottom: 1px solid var(--line); }
.article-eyebrow { font-size: 11px; font-weight: 500; letter-spacing: 0.13em; text-transform: uppercase; color: var(--accent2); margin-bottom: 1rem; display: flex; align-items: center; gap: 10px; }
.article-eyebrow::before { content:''; display:block; width:24px; height:1px; background:var(--accent2); }
.article-title { font-family: var(--serif); font-size: clamp(28px, 5vw, 58px); font-weight: 400; line-height: 1.1; letter-spacing: -0.02em; max-width: 820px; margin-bottom: 1.5rem; }
.article-meta { font-size: 13px; color: var(--ink3); display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; margin-bottom: 1.5rem; }
.article-meta span { display: flex; align-items: center; gap: 6px; }
.article-lead { font-size: 17px; color: var(--ink2); font-weight: 300; line-height: 1.7; max-width: 680px; }
.article-layout { display: grid; grid-template-columns: 1fr 280px; gap: 4rem; padding: 3.5rem 3rem; align-items: start; }
.article-content { max-width: 680px; min-width: 0; }
.article-content h2 { font-family: var(--serif); font-size: 26px; font-weight: 400; letter-spacing: -0.01em; margin: 2.5rem 0 1rem; line-height: 1.2; }
.article-content h3 { font-size: 16px; font-weight: 500; margin: 2rem 0 0.75rem; color: var(--ink); }
.article-content p { font-size: 15px; color: var(--ink2); line-height: 1.85; margin-bottom: 1.25rem; font-weight: 300; }
.article-content ul, .article-content ol { margin: 0.75rem 0 1.25rem 1.25rem; }
.article-content li { font-size: 15px; color: var(--ink2); line-height: 1.75; margin-bottom: 0.4rem; font-weight: 300; }
.article-content strong { color: var(--ink); font-weight: 500; }
.article-content pre { background: var(--ink); color: #E8EFF7; border-radius: var(--rsm); padding: 1.25rem 1.5rem; font-size: 13px; line-height: 1.6; overflow-x: auto; margin: 1.25rem 0; -webkit-overflow-scrolling: touch; }
.article-content code { font-size: 13px; background: var(--bg2); padding: 2px 6px; border-radius: 4px; color: var(--accent2); }
.article-content pre code { background: none; color: inherit; padding: 0; }
.article-content table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: 14px; display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.article-content th { text-align: left; padding: 10px 14px; background: var(--bg2); color: var(--ink); font-weight: 500; font-size: 12px; border-bottom: 1px solid var(--line); }
.article-content td { padding: 10px 14px; color: var(--ink2); border-bottom: 1px solid var(--line); }
.article-content .callout { border-left: 3px solid var(--accent); border-radius: 0; background: var(--accent-l); padding: 1rem 1.25rem; margin: 1.5rem 0; }
.article-content .callout p { color: var(--accent); margin: 0; font-size: 14px; }
.article-content hr { border: none; border-top: 1px solid var(--line); margin: 2.5rem 0; }

/* sidebar */
.article-sidebar { position: sticky; top: 90px; }
.sidebar-card { background: var(--bg2); border: 1px solid var(--line); border-radius: var(--r); padding: 1.5rem; margin-bottom: 1.25rem; }
.sidebar-card h4 { font-size: 11px; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink3); margin-bottom: 1rem; }
.sidebar-card ul { list-style: none; }
.sidebar-card ul li { font-size: 13px; color: var(--ink2); padding: 7px 0; border-bottom: 1px solid var(--line); display: flex; gap: 8px; align-items: flex-start; }
.sidebar-card ul li:last-child { border-bottom: none; }
.sidebar-card ul li::before { content: '—'; color: var(--ink3); flex-shrink:0; font-size:11px; margin-top:2px; }
.sidebar-card a { color: var(--accent); text-decoration: none; font-size: 13px; display:block; }
.sidebar-card a:hover { text-decoration: underline; }
.sidebar-back { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--ink2); text-decoration: none; padding: 10px 0; transition: color 0.2s; }
.sidebar-back:hover { color: var(--ink); }

/* article nav */
.article-nav { border-top: 1px solid var(--line); padding: 2.5rem 3rem; display: flex; gap: 1.5rem; justify-content: space-between; }
.article-nav-item { flex: 1; text-decoration: none; color: var(--ink); padding: 1.25rem 1.5rem; border: 1px solid var(--line); border-radius: var(--r); transition: border-color 0.2s, transform 0.2s; display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.article-nav-item:hover { border-color: rgba(26,24,20,0.25); transform: translateY(-2px); }
.article-nav-item small { font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink3); font-weight: 500; }
.article-nav-item span { font-family: var(--serif); font-size: 15px; line-height: 1.35; }
.article-nav-item.next { text-align: right; }

/* ── RESPONSIVE ── */
@media (max-width: 860px) {
  nav { padding: 0.9rem 1.25rem; }
  .nav-hide { display: none; }
  section { padding: 3.5rem 1.25rem; }
  .article-hero { padding: 3.5rem 1.25rem 2rem; }
  .article-layout { grid-template-columns: 1fr; padding: 2rem 1.25rem; }
  .article-sidebar { position: static; }
  .article-nav { padding: 2rem 1.25rem; flex-direction: column; }
  footer { padding: 1.5rem 1.25rem; flex-direction: column; gap: 0.5rem; text-align: center; }
}
@media (max-width: 480px) {
  .nav-logo sup { display: none; }
  .article-lead { font-size: 15px; }
  .article-title { font-size: clamp(24px, 7vw, 38px); }
}