/* OPC Stories — shared styles */
:root {
  --bg: #0f1420;
  --surface: #171e2e;
  --surface-2: #1e2740;
  --border: #2a3550;
  --text: #e8ecf5;
  --muted: #9aa7bf;
  --accent: #4f8cff;
  --accent-2: #3ddc97;
  --warn: #ffb020;
  --max: 960px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* Nav */
nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.nav-inner {
  max-width: var(--max); margin: 0 auto; padding: 14px 20px;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px;
}
.logo { font-weight: 800; font-size: 1.15rem; color: var(--text); letter-spacing: -0.02em; }
.logo span { color: var(--accent); }
nav ul { display: flex; gap: 20px; list-style: none; flex-wrap: wrap; }
nav ul a { color: var(--muted); font-size: 0.95rem; }
nav ul a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero { padding: 72px 0 48px; text-align: center; }
.hero h1 { font-size: clamp(1.9rem, 5vw, 3rem); line-height: 1.15; letter-spacing: -0.03em; }
.hero h1 em { color: var(--accent-2); font-style: normal; }
.hero p.sub { color: var(--muted); max-width: 640px; margin: 18px auto 0; font-size: 1.08rem; }

/* Buttons */
.btn {
  display: inline-block; padding: 12px 24px; border-radius: 10px;
  font-weight: 600; font-size: 1rem;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #3d7aee; text-decoration: none; }
.btn-ghost { border: 1px solid var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); text-decoration: none; }

/* Cards grid */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 18px; margin: 32px 0; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  padding: 22px; transition: transform .15s ease, border-color .15s ease;
  display: flex; flex-direction: column; gap: 8px;
}
.card:hover { transform: translateY(-3px); border-color: var(--accent); text-decoration: none; }
.card .tag {
  font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--accent-2);
}
.card h3 { font-size: 1.1rem; color: var(--text); }
.card p { color: var(--muted); font-size: 0.92rem; flex: 1; }
.card .meta { font-size: 0.85rem; color: var(--muted); border-top: 1px solid var(--border); padding-top: 10px; }
.card .meta strong { color: var(--text); }

/* Sections */
section { padding: 40px 0; }
section h2 { font-size: 1.6rem; letter-spacing: -0.02em; margin-bottom: 6px; }
section .section-sub { color: var(--muted); margin-bottom: 10px; }

/* Case page */
.facts {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px; margin: 24px 0;
}
.fact {
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 14px;
}
.fact .k { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.fact .v { font-weight: 700; margin-top: 4px; }
article.case { max-width: 760px; margin: 0 auto; padding: 48px 20px; }
article.case h1 { font-size: clamp(1.6rem, 4vw, 2.3rem); letter-spacing: -0.02em; }
article.case .byline { color: var(--muted); font-size: 0.9rem; margin: 10px 0 8px; }
article.case h2 { font-size: 1.35rem; margin: 34px 0 12px; }
article.case p, article.case li { color: #c9d3e6; margin-bottom: 12px; }
article.case ul { padding-left: 22px; }
article.case .note {
  background: rgba(255,176,32,.08); border: 1px solid rgba(255,176,32,.35);
  border-radius: 10px; padding: 14px 16px; font-size: 0.92rem; margin: 20px 0;
}
.sources { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 18px 20px; margin: 30px 0; }
.sources h2 { font-size: 1.05rem; margin-bottom: 10px; }
.sources li { margin-bottom: 6px; font-size: 0.92rem; }
.next-case {
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  border-top: 1px solid var(--border); padding-top: 20px; margin-top: 34px;
}

/* Newsletter */
.newsletter {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 16px;
  padding: 34px; text-align: center; margin: 30px 0;
}
.newsletter h2 { margin-bottom: 8px; }
.newsletter p { color: var(--muted); margin-bottom: 18px; }
.newsletter form { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.newsletter input {
  padding: 12px 16px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); min-width: 260px; font-size: 1rem;
}

/* Footer */
footer { border-top: 1px solid var(--border); margin-top: 50px; padding: 30px 0 40px; }
.foot { max-width: var(--max); margin: 0 auto; padding: 0 20px; color: var(--muted); font-size: 0.88rem; }
.foot ul { display: flex; gap: 18px; list-style: none; flex-wrap: wrap; margin-top: 10px; }
.foot .disclosure { margin-top: 14px; font-size: 0.8rem; color: #7d8aa5; }

/* Misc */
.breadcrumb { font-size: 0.85rem; color: var(--muted); margin-bottom: 18px; }
.badge {
  display: inline-block; font-size: 0.75rem; font-weight: 700; padding: 3px 10px;
  border-radius: 999px; border: 1px solid var(--border); color: var(--muted);
}
.badge.green { color: var(--accent-2); border-color: rgba(61,220,151,.4); }
.badge.blue { color: var(--accent); border-color: rgba(79,140,255,.4); }
@media (max-width: 640px) {
  .hero { padding: 48px 0 32px; }
  .newsletter { padding: 24px; }
}