/* Bilateral Persistence Ltd. — Week 6 */
:root {
  --bg: #0b1220;
  --bg-elev: #121a2b;
  --bg-card: #162033;
  --border: #243049;
  --text: #e8eef9;
  --muted: #9aabC4;
  --accent: #3dd6c6;
  --accent-dim: #1f8f84;
  --warn: #f0b429;
  --danger: #ff6b7a;
  --link: #7ec8ff;
  --max: 960px;
  --radius: 12px;
  --shadow: 0 12px 40px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; color: var(--accent); }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(11,18,32,.92);
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(8px);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .9rem 0;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  flex-direction: column;
  gap: .15rem;
}
.brand-name {
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--text);
  font-size: 1.05rem;
}
.brand-name span { color: var(--accent); }
.brand-tag {
  font-size: .78rem;
  color: var(--muted);
}
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem .9rem;
  font-size: .92rem;
}
.nav a { color: var(--muted); }
.nav a:hover, .nav a.active { color: var(--accent); text-decoration: none; }

/* Hero */
.hero {
  padding: 3.2rem 0 2.4rem;
  background:
    radial-gradient(ellipse 80% 60% at 20% 0%, rgba(61,214,198,.12), transparent 55%),
    radial-gradient(ellipse 60% 50% at 90% 20%, rgba(126,200,255,.08), transparent 50%);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 2rem;
  align-items: center;
}
@media (max-width: 760px) {
  .hero-grid { grid-template-columns: 1fr; }
}
.eyebrow {
  display: inline-block;
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  padding: .25rem .6rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}
.hero h1 {
  margin: 0 0 .75rem;
  font-size: clamp(1.8rem, 4vw, 2.55rem);
  line-height: 1.15;
  letter-spacing: -.02em;
}
.hero .lede {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 36rem;
  margin: 0 0 1.5rem;
}
.cta-row { display: flex; flex-wrap: wrap; gap: .75rem; }
.btn {
  display: inline-block;
  padding: .7rem 1.15rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: .95rem;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
}
.btn-primary {
  background: var(--accent);
  color: #06201c;
}
.btn-primary:hover { background: #5fe0d2; text-decoration: none; color: #06201c; }
.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

.hero-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow);
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: .82rem;
  line-height: 1.55;
}
.hero-card .prompt { color: var(--accent); }
.hero-card .ok { color: #7dffb3; }
.hero-card .alert { color: var(--danger); }
.hero-card .dim { color: var(--muted); }

/* Sections */
section { padding: 2.5rem 0; }
.section-title {
  margin: 0 0 .5rem;
  font-size: 1.55rem;
  letter-spacing: -.01em;
}
.section-sub {
  color: var(--muted);
  margin: 0 0 1.75rem;
  max-width: 40rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.card h3 {
  margin: 0 0 .5rem;
  font-size: 1.05rem;
}
.card p {
  margin: 0;
  color: var(--muted);
  font-size: .95rem;
}
.card .icon {
  display: inline-block;
  width: 2rem;
  height: 2rem;
  line-height: 2rem;
  text-align: center;
  border-radius: 8px;
  background: rgba(61,214,198,.12);
  color: var(--accent);
  margin-bottom: .75rem;
  font-size: 1rem;
}

.banner-strip {
  background: var(--bg-card);
  border-block: 1px solid var(--border);
  padding: 1.5rem 0;
}
.banner-strip p {
  margin: 0;
  color: var(--muted);
  font-size: .98rem;
}
.banner-strip strong { color: var(--warn); }

.prose { max-width: 42rem; }
.prose p { color: var(--muted); }
.prose h2 { margin-top: 2rem; font-size: 1.25rem; }
.prose ul { color: var(--muted); padding-left: 1.2rem; }
.prose li { margin-bottom: .4rem; }

.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: .92rem;
}
th, td {
  text-align: left;
  padding: .75rem .9rem;
  border-bottom: 1px solid var(--border);
}
th { color: var(--accent); font-weight: 600; }
td { color: var(--muted); }

/* Forms (inert) */
.form {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  max-width: 32rem;
}
.form label {
  display: block;
  font-size: .85rem;
  color: var(--muted);
  margin-bottom: .35rem;
}
.form input, .form textarea, .form select {
  width: 100%;
  margin-bottom: 1rem;
  padding: .65rem .75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font: inherit;
}
.form .note {
  font-size: .85rem;
  color: var(--muted);
  margin-top: .75rem;
}

.corr-item {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  margin-bottom: 1rem;
}
.corr-item h3 {
  margin: 0 0 .35rem;
  font-size: 1.05rem;
}
.corr-meta {
  font-size: .8rem;
  color: var(--muted);
  margin-bottom: .75rem;
}
.corr-pitch { color: var(--muted); margin: 0 0 .75rem; }
.corr-rebuttal {
  border-left: 3px solid var(--accent);
  padding-left: .9rem;
  margin: 0;
  color: var(--text);
}
.corr-rebuttal cite {
  display: block;
  margin-top: .5rem;
  font-size: .85rem;
  color: var(--accent);
  font-style: normal;
}

.foot {
  border-top: 1px solid var(--border);
  margin-top: 3rem;
  padding: 1.75rem 0 2.5rem;
  color: var(--muted);
  font-size: .85rem;
}
.foot-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}
.foot a { color: var(--muted); }
.foot a:hover { color: var(--accent); }
.fine { margin-top: .75rem; max-width: 40rem; opacity: .85; }

.pill {
  display: inline-block;
  font-size: .72rem;
  padding: .15rem .5rem;
  border-radius: 999px;
  background: rgba(240,180,41,.15);
  color: var(--warn);
  border: 1px solid rgba(240,180,41,.35);
  vertical-align: middle;
  margin-left: .35rem;
}