/* AI PTI — Minimal clean styles, mobile-first */

:root {
  --accent: #E8C97D;
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #555555;
  --border: #e0e0e0;
  --max-w: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --text: #e8e8e8;
    --muted: #aaaaaa;
    --border: #2a2a2a;
  }
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.7;
}

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

/* Header */
header {
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 0;
  margin-bottom: 2.5rem;
}

header .page-wrap {
  display: flex;
  align-items: center;
}

.wordmark {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

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

/* Main content */
main {
  min-height: 60vh;
}

/* Hero (index only) */
.hero {
  text-align: center;
  padding: 4rem 0 3rem;
}

.hero .logo-big {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  margin: 0 0 0.5rem;
}

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

.hero .tagline {
  color: var(--muted);
  font-size: 1.1rem;
  margin: 0 0 2rem;
}

.hero .nav-links {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.4rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.15s;
}

.btn:hover { opacity: 0.8; }

.btn-primary {
  background: var(--accent);
  color: #1a1a1a;
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}

/* Content pages */
.content-header {
  margin-bottom: 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.content-header h1 {
  font-size: 1.8rem;
  font-weight: 800;
  margin: 0 0 0.4rem;
  letter-spacing: -0.03em;
}

.content-header .meta {
  color: var(--muted);
  font-size: 0.9rem;
}

/* Typography */
h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 2rem 0 0.5rem;
  color: var(--text);
}

h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.5rem 0 0.4rem;
  color: var(--text);
}

p {
  margin: 0 0 1rem;
}

ul, ol {
  margin: 0 0 1rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.35rem;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}

a:hover {
  border-bottom-color: var(--accent);
}

strong {
  font-weight: 600;
}

.callout {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  padding: 0.85rem 1rem;
  margin: 1rem 0;
  font-size: 0.97rem;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  margin-top: 4rem;
  padding: 2rem 0;
  color: var(--muted);
  font-size: 0.875rem;
}

footer .page-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  align-items: center;
  justify-content: space-between;
}

footer .footer-brand {
  font-weight: 600;
  color: var(--text);
}

footer nav {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

footer a {
  color: var(--muted);
  font-size: 0.875rem;
}

@media (max-width: 480px) {
  .hero .logo-big { font-size: 2rem; }
  .content-header h1 { font-size: 1.5rem; }
}