/* ============================================================
   Global Reset & Base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --black: #0a0a0a;
  --white: #ffffff;
  --off-white: #f4f4f4;
  --mid-grey: #888;
  --light-grey: #d4d4d4;
  --border: #222;
  --accent: #ffffff;
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  --max-w: 1200px;
  --nav-h: 64px;

  /* Accent colour palette — matches licence badge system */
  --tint-blue:   #e3f2fd;  --bd-blue:   #90caf9;  --txt-blue:   #0d47a1;
  --tint-green:  #e8f5e9;  --bd-green:  #a5d6a7;  --txt-green:  #1b5e20;
  --tint-purple: #f3e5f5;  --bd-purple: #ce93d8;  --txt-purple: #4a148c;
  --tint-pink:   #fce4ec;  --bd-pink:   #f48fb1;  --txt-pink:   #880e4f;
  --tint-amber:  #fff8e1;  --bd-amber:  #ffcc02;  --txt-amber:  #e65100;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-sans);
  background: var(--white);
  color: var(--black);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================================
   Typography
   ============================================================ */
h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; line-height: 1.15; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); font-weight: 700; line-height: 1.2; letter-spacing: -0.01em; }
h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); font-weight: 600; line-height: 1.3; }
h4 { font-size: 1rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; }
p { max-width: 72ch; }
a { color: inherit; }
a:hover { opacity: 0.7; }

/* ============================================================
   Navigation
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--light-grey);
  height: var(--nav-h);
  display: flex;
  align-items: center;
}

.nav-inner {
  max-width: var(--max-w);
  width: 100%;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-logo {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--black);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-logo span { color: var(--mid-grey); font-weight: 400; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
  flex-wrap: nowrap;
}

.nav-links a {
  color: #555;
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  padding: 0.4rem 0.75rem;
  border-radius: 4px;
  transition: color 0.15s, background 0.15s;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active { color: var(--black); background: rgba(0,0,0,0.06); opacity: 1; }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--black);
  border-radius: 2px;
  transition: all 0.2s;
}

/* ============================================================
   Hero / Page Header
   ============================================================ */
.page-hero {
  background: var(--black);
  color: var(--white);
  padding: 5rem 1.5rem 4rem;
}

.page-hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.page-hero .eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--bd-blue);
  margin-bottom: 1rem;
}

.page-hero h1 { color: var(--white); margin-bottom: 1.25rem; }
.page-hero p { color: var(--light-grey); font-size: 1.15rem; max-width: 65ch; }

.hero-heading {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}
.hero-heading h1 {
  margin-bottom: 0;
}
.hero-heading-icon {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ============================================================
   Main Content
   ============================================================ */
main { flex: 1; }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section { padding: 4rem 1.5rem; }
.section-inner { max-width: var(--max-w); margin: 0 auto; }

.section-alt { background: #f0f5ff; }

.section-title {
  margin-bottom: 0.5rem;
}

.section-sub {
  color: var(--mid-grey);
  margin-bottom: 2.5rem;
  font-size: 1.05rem;
}

/* ============================================================
   Cards — Model / LLM cards
   ============================================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5px;
  background: var(--black);
  border: 1.5px solid var(--black);
}

.card {
  background: var(--white);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.card-provider {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mid-grey);
}

.card h3 { font-size: 1.2rem; }
.card p { font-size: 0.9rem; color: #444; flex: 1; }

.card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
  padding: 0.45rem 1rem;
  border: 1.5px solid var(--black);
  border-radius: 3px;
  transition: background 0.15s, color 0.15s;
  line-height: 1;
}

.btn:hover { background: var(--black); color: var(--white); opacity: 1; }

.btn-fill {
  background: var(--black);
  color: var(--white);
}

.btn-fill:hover { background: #333; }

.btn-sm { font-size: 0.72rem; padding: 0.35rem 0.75rem; }

/* ============================================================
   Info / Prose sections
   ============================================================ */
.prose h2 { margin-bottom: 1rem; margin-top: 2.5rem; }
.prose h3 { margin-bottom: 0.6rem; margin-top: 2rem; }
.prose p { margin-bottom: 1rem; color: #222; }
.prose ul, .prose ol { margin: 0.75rem 0 1rem 1.5rem; }
.prose li { margin-bottom: 0.4rem; }
.prose a { text-decoration: underline; text-underline-offset: 3px; }
.prose h2:first-child, .prose h3:first-child { margin-top: 0; }

/* ============================================================
   Highlight boxes
   ============================================================ */
.highlight-box {
  border: 1.5px solid var(--black);
  border-left: 4px solid var(--bd-blue);
  padding: 1.75rem 2rem;
  margin: 2rem 0;
}
.highlight-box.green  { border-left-color: var(--bd-green); }
.highlight-box.purple { border-left-color: var(--bd-purple); }
.highlight-box.amber  { border-left-color: var(--bd-amber); }
.highlight-box.pink   { border-left-color: var(--bd-pink); }

.highlight-box h3 { margin-bottom: 0.6rem; }
.highlight-box p { margin: 0; color: #333; }

.highlight-box.inverted {
  background: var(--black);
  color: var(--white);
}

.highlight-box.inverted p { color: var(--light-grey); }

/* ============================================================
   Two-column layout
   ============================================================ */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

@media (max-width: 768px) {
  .two-col { grid-template-columns: 1fr; gap: 2rem; }
}

/* ============================================================
   Affiliate cards
   ============================================================ */
.affiliate-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
}

.affiliate-card {
  border: 1.5px solid var(--black);
  display: flex;
  flex-direction: column;
}

.affiliate-card-header {
  background: var(--black);
  color: var(--white);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.affiliate-card-header h3 { font-size: 1.05rem; margin: 0; color: var(--white); }

.tag {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.25rem 0.6rem;
  border: 1px solid rgba(255,255,255,0.3);
  color: var(--light-grey);
  white-space: nowrap;
  border-radius: 2px;
}
/* Category colour variants — coloured badge floats on dark card header */
.tag-blue   { background: var(--tint-blue);   color: var(--txt-blue);   border-color: var(--bd-blue); }
.tag-green  { background: var(--tint-green);  color: var(--txt-green);  border-color: var(--bd-green); }
.tag-purple { background: var(--tint-purple); color: var(--txt-purple); border-color: var(--bd-purple); }
.tag-pink   { background: var(--tint-pink);   color: var(--txt-pink);   border-color: var(--bd-pink); }
.tag-amber  { background: var(--tint-amber);  color: var(--txt-amber);  border-color: var(--bd-amber); }

/* Card left-border accent (homepage tiles etc.) */
.card-accent-blue   { border-left: 4px solid var(--bd-blue); }
.card-accent-green  { border-left: 4px solid var(--bd-green); }
.card-accent-purple { border-left: 4px solid var(--bd-purple); }
.card-accent-amber  { border-left: 4px solid var(--bd-amber); }
.card-accent-pink   { border-left: 4px solid var(--bd-pink); }

.affiliate-card-body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; gap: 1rem; }
.affiliate-card-body p { font-size: 0.9rem; color: #333; flex: 1; }

.model-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.pill {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  background: var(--off-white);
  border: 1px solid var(--light-grey);
  border-radius: 2px;
  text-decoration: none;
  color: var(--black);
  transition: background 0.15s;
}

.pill:hover { background: var(--tint-blue); color: var(--txt-blue); border-color: var(--bd-blue); opacity: 1; }

.affiliate-card-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--light-grey);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.affiliate-badge {
  font-size: 0.68rem;
  color: var(--mid-grey);
  font-weight: 500;
}

/* ============================================================
   Obligation / Numbered list
   ============================================================ */
.obligation-list { list-style: none; display: flex; flex-direction: column; gap: 1.5px; }

.obligation-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 0;
  border: 1.5px solid var(--black);
}

.obligation-num {
  background: var(--black);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  font-family: var(--font-mono);
}

.obligation-content { padding: 1.25rem 1.5rem; }
.obligation-content h4 { margin-bottom: 0.35rem; font-size: 0.85rem; }
.obligation-content p { font-size: 0.88rem; color: #333; max-width: none; margin: 0; }

/* ============================================================
   Table
   ============================================================ */
.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

th {
  background: var(--black);
  color: var(--white);
  text-align: left;
  padding: 0.75rem 1rem;
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--light-grey);
  vertical-align: top;
}

tr:hover td { background: var(--tint-blue); }

/* ============================================================
   Divider
   ============================================================ */
.divider {
  border: none;
  border-top: 1px solid var(--light-grey);
  margin: 2.5rem 0;
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: var(--black);
  color: var(--light-grey);
  padding: 3rem 1.5rem;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: start;
}

.footer-brand { font-weight: 700; color: var(--white); margin-bottom: 0.5rem; font-size: 0.95rem; }
.footer-copy { font-size: 0.8rem; color: var(--mid-grey); }
.footer-links { display: flex; gap: 1.25rem; flex-wrap: wrap; justify-content: flex-end; }
.footer-links a { font-size: 0.8rem; color: var(--mid-grey); text-decoration: none; transition: color 0.15s; }
.footer-links a:hover { color: var(--white); opacity: 1; }

.footer-disclaimer {
  grid-column: 1 / -1;
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  font-size: 0.75rem;
  color: var(--mid-grey);
  line-height: 1.7;
}

/* ============================================================
   Responsive — Mobile
   ============================================================ */
@media (max-width: 900px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: var(--nav-h); left: 0; right: 0; background: var(--white); border-bottom: 1px solid var(--light-grey); padding: 1rem 1.5rem; gap: 0.25rem; }
  .nav-links.open { display: flex; }
  .nav-hamburger { display: flex; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
}

@media (max-width: 640px) {
  .page-hero { padding: 3.5rem 1rem 3rem; }
  .section { padding: 3rem 1rem; }
  .card-grid { grid-template-columns: 1fr; gap: 1px; }
  .affiliate-grid { grid-template-columns: 1fr; }
}