/* CourseSignal — simple, fast, readable, mobile-friendly */
:root {
  --bg: #fafbfc;
  --surface: #ffffff;
  --text: #1a1d21;
  --muted: #5c6570;
  --border: #e2e6ea;
  --accent: #0b5fff;
  --accent-hover: #0948c7;
  --ad-bg: #fff8e6;
  --ad-border: #e6c200;
  --footer-bg: #f0f2f5;
  --radius: 6px;
  --max: 42rem;
  --wide: 56rem;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, monospace;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
a:hover { color: var(--accent-hover); }

/* Header */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-inner {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
}

.logo {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.logo:hover { color: var(--accent); }

.logo span { color: var(--accent); }

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  font-size: 0.95rem;
}
.nav a {
  color: var(--muted);
  text-decoration: none;
}
.nav a:hover { color: var(--text); }

/* Layout */
.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.75rem 1.25rem 3rem;
}

.wrap-wide {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 1.75rem 1.25rem 3rem;
}

/* Hero / home */
.hero {
  padding: 2.5rem 0 1.5rem;
}
.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin: 0 0 0.75rem;
}
.hero .lead {
  font-size: 1.125rem;
  color: var(--muted);
  margin: 0 0 1.5rem;
  max-width: 36rem;
}

.niche-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 2rem;
  padding: 0;
  list-style: none;
}
.niche-pills li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 0.85rem;
  font-size: 0.875rem;
  color: var(--muted);
}

/* Cards */
.card-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
  margin: 1.5rem 0 2.5rem;
}
@media (min-width: 640px) {
  .card-grid { grid-template-columns: 1fr 1fr; }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease;
}
.card:hover {
  border-color: var(--accent);
  color: inherit;
}
.card h3 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.card p {
  margin: 0;
  font-size: 0.925rem;
  color: var(--muted);
  flex: 1;
}
.card .meta {
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 600;
}

/* Product callout on home */
.product-banner {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.35rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
@media (min-width: 640px) {
  .product-banner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}
.product-banner h2 {
  margin: 0 0 0.35rem;
  font-size: 1.2rem;
}
.product-banner p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Buttons */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff !important;
  text-decoration: none !important;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover { background: var(--accent-hover); color: #fff !important; }

.btn-secondary {
  background: var(--surface);
  color: var(--text) !important;
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent) !important;
  background: var(--surface);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1rem 0;
}

/* Ad disclosures */
.ad-box {
  background: var(--ad-bg);
  border: 1px solid var(--ad-border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  margin: 1rem 0 1.5rem;
  font-size: 0.9rem;
  line-height: 1.5;
}
.ad-box strong {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}
.ad-inline {
  background: var(--ad-bg);
  border-left: 3px solid var(--ad-border);
  padding: 0.65rem 0.9rem;
  margin: 1rem 0;
  font-size: 0.9rem;
}

/* Article typography */
.article-meta {
  color: var(--muted);
  font-size: 0.875rem;
  margin: 0 0 0.5rem;
}

h1 {
  font-size: clamp(1.5rem, 3.5vw, 1.9rem);
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}

h2 {
  font-size: 1.3rem;
  letter-spacing: -0.015em;
  margin: 2rem 0 0.75rem;
  padding-top: 0.25rem;
}

h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
}

p { margin: 0 0 1rem; }

ul, ol {
  margin: 0 0 1rem;
  padding-left: 1.35rem;
}
li { margin-bottom: 0.35rem; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.925rem;
  margin: 0 0 1.25rem;
  background: var(--surface);
}
th, td {
  border: 1px solid var(--border);
  padding: 0.55rem 0.7rem;
  text-align: left;
  vertical-align: top;
}
th {
  background: var(--footer-bg);
  font-weight: 600;
}

.cta-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin: 1.5rem 0;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

/* Pricing cards on sales page */
.pricing-grid {
  display: grid;
  gap: 1rem;
  margin: 1.5rem 0;
}
@media (min-width: 560px) {
  .pricing-grid { grid-template-columns: 1fr 1fr; }
}
.price-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.price-card .amount {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}
.price-card .amount small {
  font-size: 1rem;
  font-weight: 500;
  color: var(--muted);
}
.price-card .tier-name {
  font-weight: 600;
  margin: 0;
}
.price-card .tier-desc {
  color: var(--muted);
  font-size: 0.925rem;
  margin: 0 0 0.5rem;
  flex: 1;
}

/* Disclosure page */
.disclosure-section {
  margin-bottom: 2rem;
}
.disclosure-section pre,
.template-block {
  background: var(--footer-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  font-size: 0.9rem;
  white-space: pre-wrap;
  font-family: var(--font);
  margin: 0.75rem 0;
}

/* Footer */
.site-footer {
  background: var(--footer-bg);
  border-top: 1px solid var(--border);
  padding: 2rem 1.25rem;
  font-size: 0.875rem;
  color: var(--muted);
}
.footer-inner {
  max-width: var(--wide);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
@media (min-width: 640px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
}
.footer-links a {
  color: var(--muted);
  text-decoration: none;
}
.footer-links a:hover { color: var(--text); }
.footer-note {
  max-width: 28rem;
  margin: 0;
  line-height: 1.5;
}

.section-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin: 0 0 0.75rem;
}

.todo-note {
  font-size: 0.8rem;
  color: var(--muted);
  font-style: italic;
}

.status-note {
  font-size: 0.875rem;
  color: var(--muted);
  margin: 0.5rem 0 0;
}

.hero-cta {
  margin: 0 0 1.5rem;
}