@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Satoshi:wght@300;400;500&display=swap');

:root {
  --black: #111;
  --dark: #333;
  --mid: #777;
  --light: #b0b0b0;
  --border: #e5e5e5;
  --bg: #fafafa;
  --white: #fff;
  --accent: #2a5a3a;
  --accent-soft: #e8f0eb;
  --serif: 'Instrument Serif', Georgia, serif;
  --sans: 'Satoshi', -apple-system, sans-serif;
  --max: 1080px;
  --px: clamp(20px, 5vw, 64px);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
  font-family: var(--sans);
  color: var(--black);
  background: var(--white);
  font-weight: 400;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ── NAV ── */
header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--px);
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--black);
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.82rem;
  color: var(--mid);
  transition: color 0.2s;
  letter-spacing: 0.01em;
}

.nav-links a:hover,
.nav-links a.active { color: var(--black); }

.nav-links .book-link {
  color: var(--accent);
  font-weight: 500;
}

.nav-links .book-link:hover { color: var(--black); }

.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 24px;
  height: 14px;
  position: relative;
}

.hamburger span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--black);
  transition: all 0.3s;
}

.hamburger span:first-child { top: 0; }
.hamburger span:nth-child(2) { top: 50%; }
.hamburger span:last-child { top: 100%; }

.hamburger.open span:first-child { top: 50%; transform: rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:last-child { top: 50%; transform: rotate(-45deg); }

/* Mobile overlay */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--white);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
}

.mobile-nav.open { display: flex; }

.mobile-nav a {
  font-family: var(--serif);
  font-size: 1.6rem;
  color: var(--black);
}

/* ── MAIN ── */
main {
  flex: 1;
  padding-top: 56px;
}

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

/* ── PAGE HEADER ── */
.page-header {
  padding: 80px 0 48px;
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.page-header h1 em {
  font-style: italic;
  color: var(--accent);
}

.page-header .sub {
  margin-top: 14px;
  color: var(--mid);
  font-size: 0.95rem;
  max-width: 420px;
  line-height: 1.65;
}

/* ── PROSE ── */
.prose {
  color: var(--dark);
  font-size: 0.95rem;
  line-height: 1.8;
}

.prose p + p { margin-top: 16px; }

.prose strong { font-weight: 500; color: var(--black); }

/* ── DIVIDER ── */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0;
}

/* ── SECTION ── */
.section {
  padding: 64px 0;
}

.section + .section {
  border-top: 1px solid var(--border);
}

.section-label {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--light);
  margin-bottom: 24px;
  font-weight: 500;
}

/* ── FOOTER CTA ── */
.footer-cta {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 64px var(--px);
  text-align: center;
}

.footer-cta h2 {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}

.footer-cta h2 em {
  font-style: italic;
  color: var(--accent);
}

.footer-cta .sub {
  color: var(--mid);
  font-size: 0.88rem;
  margin-bottom: 28px;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--black);
  color: var(--white);
  padding: 12px 32px;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  font-family: var(--sans);
  transition: opacity 0.2s;
}

.cta-btn:hover { opacity: 0.8; }

.cta-meta {
  display: block;
  margin-top: 12px;
  font-size: 0.75rem;
  color: var(--light);
}

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--border);
  padding: 32px var(--px);
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-left {
  font-size: 0.78rem;
  color: var(--mid);
  line-height: 1.7;
}

.footer-right {
  display: flex;
  gap: 24px;
}

.footer-right a {
  font-size: 0.78rem;
  color: var(--mid);
  transition: color 0.2s;
}

.footer-right a:hover { color: var(--black); }

/* ── ANIMATIONS ── */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.show {
  opacity: 1;
  transform: none;
}

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: block; }
  .page-header { padding: 56px 0 36px; }
  .section { padding: 48px 0; }
}