/* ENDA AI — shared site stylesheet (V35) */
:root {
  --navy: #0a1628;
  --navy-2: #0f2038;
  --cyan: #22d3ee;
  --cyan-dim: #67e8f9;
  --ink: #17202c;
  --muted: #5b6b7f;
  --paper: #ffffff;
  --paper-warm: #f7f8fa;
  --line: #e3e8ef;
  --serif: Georgia, 'Times New Roman', serif;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--sans); color: var(--ink); line-height: 1.6;
       -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; }
a { color: var(--cyan); }
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; background: var(--navy);
  border-bottom: 1px solid rgba(34,211,238,.18); }
.site-header .container { display: flex; align-items: center;
  justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand img { height: 30px; }
.nav { display: flex; gap: 28px; align-items: center; }
.nav a { color: #c7d2e0; text-decoration: none; font-size: 14px;
  letter-spacing: .02em; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--cyan); }
.nav .cta { background: var(--cyan); color: var(--navy) !important;
  padding: 8px 16px; border-radius: 6px; font-weight: 600; }
.nav .cta:hover { background: var(--cyan-dim); }
.nav-toggle { display: none; background: none; border: 0; color: #fff;
  font-size: 24px; cursor: pointer; }

/* Hero — shared */
.hero { background: var(--navy); color: #fff; padding: 96px 0 88px; }
.hero .eyebrow { color: var(--cyan); font-size: 13px; font-weight: 600;
  letter-spacing: .16em; text-transform: uppercase; margin-bottom: 18px; }
.hero h1 { font-family: var(--serif); font-weight: 400; font-size: clamp(34px,5vw,56px);
  line-height: 1.15; max-width: 16ch; }
.hero p.lede { color: #b9c6d6; font-size: clamp(17px,2vw,20px);
  max-width: 58ch; margin: 24px 0 36px; }
.btn { display: inline-block; padding: 13px 26px; border-radius: 6px;
  font-weight: 600; font-size: 15px; text-decoration: none; margin-right: 14px; }
.btn-primary { background: var(--cyan); color: var(--navy); }
.btn-ghost { border: 1px solid #3d5470; color: #dbe4ee; }
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }
.btn-primary:hover { background: var(--cyan-dim); }

/* Sections */
.section { padding: 72px 0; }
.section.alt { background: var(--paper-warm); }
.section h2 { font-family: var(--serif); font-weight: 400; font-size: 32px;
  margin-bottom: 14px; color: var(--navy); }
.section .sub { color: var(--muted); max-width: 62ch; margin-bottom: 44px; }
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2,1fr); }
.grid-3 { grid-template-columns: repeat(3,1fr); }
.grid-4 { grid-template-columns: repeat(4,1fr); }
.card { background: var(--paper); border: 1px solid var(--line);
  border-radius: 10px; padding: 28px; }
.card h3 { font-size: 18px; margin-bottom: 10px; color: var(--navy); }
.card p, .card li { color: var(--muted); font-size: 15px; }
.card ul { padding-left: 18px; }
.card .num { font-family: var(--serif); font-size: 15px; color: var(--cyan);
  letter-spacing: .1em; display:block; margin-bottom: 8px; }

/* Dark variant */
.dark { background: var(--navy); color: #fff; }
.dark h2 { color: #fff; }
.dark .sub { color: #9fb0c4; }
.dark .card { background: var(--navy-2); border-color: #1e3450; }
.dark .card h3 { color: #fff; }
.dark .card p, .dark .card li { color: #a8b8cc; }

/* Stats strip */
.stats { display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; }
.stat { text-align: left; }
.stat b { font-family: var(--serif); font-size: 42px; font-weight: 400;
  color: var(--cyan); display: block; line-height: 1.1; }
.stat span { color: #9fb0c4; font-size: 14px; }

/* Article */
.article { max-width: 720px; margin: 0 auto; }
.article h1 { font-family: var(--serif); font-weight: 400; font-size: 40px;
  line-height: 1.2; margin-bottom: 18px; color: var(--navy); }
.article .meta { color: var(--muted); font-size: 14px; margin-bottom: 36px;
  padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.article h2 { font-size: 26px; margin: 44px 0 14px; }
.article p { margin-bottom: 18px; color: #2c3a4d; font-size: 17px; }
.article figure { margin: 34px 0; }
.article figcaption { color: var(--muted); font-size: 13px;
  margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--line); }
.article .note { background: var(--paper-warm); border-left: 3px solid var(--cyan);
  padding: 18px 22px; border-radius: 0 8px 8px 0; font-size: 15px; color: var(--muted);
  margin: 28px 0; }

/* List blocks */
.list-plain { list-style: none; }
.list-plain li { padding: 16px 0; border-bottom: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: baseline; gap: 16px; }
.list-plain li:last-child { border-bottom: 0; }
.list-plain .date { color: var(--muted); font-size: 13px; white-space: nowrap; }

/* Footer */
.site-footer { background: var(--navy); color: #8ea1b8; padding: 56px 0 32px;
  font-size: 14px; }
.site-footer .grid { grid-template-columns: 2fr 1fr 1fr; }
.site-footer h4 { color: #fff; font-size: 14px; margin-bottom: 14px;
  letter-spacing: .06em; text-transform: uppercase; }
.site-footer a { color: #8ea1b8; text-decoration: none; display: block;
  margin-bottom: 8px; }
.site-footer a:hover { color: var(--cyan); }
.site-footer .legal { border-top: 1px solid #1e3450; margin-top: 40px;
  padding-top: 24px; font-size: 13px; color: #64798f; }

/* Homepage B — light editorial variant */
.b .site-header { background: #fff; border-bottom: 1px solid var(--line); }
.b .nav a { color: var(--muted); }
.b .nav a:hover, .b .nav a[aria-current="page"] { color: var(--navy); }
.b .hero { background: var(--paper-warm); color: var(--ink); padding: 112px 0; }
.b .hero h1 { color: var(--navy); }
.b .hero p.lede { color: var(--muted); }
.b .hero .eyebrow { color: #0e7490; }
.b .btn-ghost { border-color: #b8c4d0; color: var(--navy); }

@media (max-width: 820px) {
  .nav { display: none; }
  .nav.open { display: flex; position: absolute; top: 68px; left: 0; right: 0;
    background: var(--navy); flex-direction: column; padding: 20px 24px 28px;
    gap: 18px; }
  .b .nav.open { background: #fff; box-shadow: 0 12px 24px rgba(0,0,0,.08); }
  .nav-toggle { display: block; }
  .b .nav-toggle { color: var(--navy); }
  .grid-2, .grid-3, .grid-4, .stats, .site-footer .grid {
    grid-template-columns: 1fr; }
  .stats { gap: 28px; }
  .hero { padding: 64px 0; }
  .article h1 { font-size: 30px; }
}