:root {
  --color-bg: #faf9f6;
  --color-bg-alt: #eef2ee;
  --color-surface: #ffffff;
  --color-border: #dfe6e0;
  --color-text: #16241c;
  --color-text-muted: #5b6b60;
  --color-primary: #2d6a4f;
  --color-primary-dark: #1b4332;
  --color-accent: #a97d3f;
  --max-width: 1120px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
  display: block;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(250, 249, 246, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--color-primary-dark);
}

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

nav.site-nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}

nav.site-nav a {
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.15s ease;
}

nav.site-nav a:hover,
nav.site-nav a[aria-current="page"] {
  border-bottom-color: var(--color-primary);
}

/* Hero */
.hero {
  padding: 96px 0 72px;
  text-align: center;
}

.hero .eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 18px;
}

.hero h1 {
  font-size: clamp(2.1rem, 4.5vw, 3.4rem);
  line-height: 1.1;
  margin: 0 0 20px;
  color: var(--color-primary-dark);
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 620px;
  margin: 0 auto 32px;
}

.button {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.15s ease, transform 0.15s ease;
}

.button:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

.button.secondary {
  background: transparent;
  color: var(--color-primary-dark);
  border: 1.5px solid var(--color-border);
}

.button.secondary:hover {
  border-color: var(--color-primary);
  background: var(--color-surface);
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Persona sections */
.persona {
  padding: 64px 0;
  border-top: 1px solid var(--color-border);
}

.persona.alt {
  background: var(--color-bg-alt);
}

.persona .wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.persona.reverse .wrap {
  direction: rtl;
}

.persona.reverse .wrap > * {
  direction: ltr;
}

.persona-copy .eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.persona-copy h2 {
  font-size: 1.7rem;
  margin: 0 0 14px;
  color: var(--color-primary-dark);
  letter-spacing: -0.01em;
}

.persona-copy p {
  color: var(--color-text-muted);
  font-size: 1rem;
  margin: 0;
}

/* Chat mockup card */
.chat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 22px;
  box-shadow: 0 12px 32px -18px rgba(27, 67, 50, 0.35);
}

.chat-card .chat-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  font-weight: 600;
}

.chat-card .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  display: inline-block;
}

.bubble {
  border-radius: 14px;
  padding: 12px 16px;
  font-size: 0.95rem;
  max-width: 88%;
  margin-bottom: 10px;
}

.bubble.user {
  background: var(--color-primary-dark);
  color: #fff;
  margin-left: auto;
  border-bottom-right-radius: 4px;
}

.bubble.answer {
  background: var(--color-bg-alt);
  color: var(--color-text);
  border-bottom-left-radius: 4px;
}

.chat-card .note {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  border-top: 1px dashed var(--color-border);
  margin-top: 14px;
  padding-top: 12px;
}

.chat-card .note .mark {
  color: var(--color-accent);
  font-weight: 700;
}

/* CTA */
.cta {
  padding: 80px 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.cta h2 {
  font-size: 1.8rem;
  color: var(--color-primary-dark);
  margin: 0 0 14px;
}

.cta p {
  color: var(--color-text-muted);
  max-width: 520px;
  margin: 0 auto 28px;
}

/* Footer */
footer.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
}

footer.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

footer.site-footer a {
  text-decoration: none;
  color: var(--color-text-muted);
}

footer.site-footer a:hover {
  color: var(--color-primary);
}

footer.site-footer ul {
  list-style: none;
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0;
}

/* About page */
.page-header {
  padding: 64px 0 24px;
}

.page-header h1 {
  font-size: 2.2rem;
  color: var(--color-primary-dark);
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

.page-header p {
  color: var(--color-text-muted);
  max-width: 640px;
  font-size: 1.05rem;
}

.content-block {
  padding: 28px 0;
  max-width: 720px;
}

.content-block h2 {
  font-size: 1.3rem;
  color: var(--color-primary-dark);
  margin: 0 0 12px;
}

.content-block p {
  color: var(--color-text);
  margin: 0 0 16px;
}

.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: 2px solid var(--color-border);
}

.timeline li {
  position: relative;
  padding: 4px 0 20px 24px;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
}

.timeline .status {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 10px;
  border-radius: 999px;
  margin-bottom: 6px;
}

.timeline .status.active {
  background: #e3efe8;
  color: var(--color-primary-dark);
}

.timeline .status.planned {
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
}

.repo-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.repo-list li {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 12px;
  background: var(--color-surface);
}

.repo-list a {
  font-weight: 600;
  text-decoration: none;
  color: var(--color-primary-dark);
}

.repo-list a:hover {
  color: var(--color-primary);
}

.repo-list .desc {
  display: block;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-top: 4px;
}

@media (max-width: 820px) {
  .persona .wrap,
  .persona.reverse .wrap {
    grid-template-columns: 1fr;
    direction: ltr;
  }

  .persona-copy {
    order: 1;
  }

  .chat-card {
    order: 2;
  }
}

@media (max-width: 560px) {
  nav.site-nav ul {
    gap: 16px;
  }

  .hero {
    padding: 64px 0 48px;
  }
}