:root {
  --cream: #FAF8F5;
  --white: #FFFFFF;
  --charcoal: #2C2C2C;
  --charcoal-soft: #5A5A5A;
  --gold: #B8956E;
  --gold-deep: #96734D;
  --navy: #1B2A4A;
  --rule: #E8E4DF;
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Source Serif 4', Georgia, serif;
  --font-ui: 'Source Sans 3', -apple-system, sans-serif;
  --section-padding: 100px;
  --content-width: 680px;
  --reading-width: 640px;
}

*, ::before, ::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.7;
  color: var(--charcoal);
  background-color: var(--cream);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; line-height: 1.2; }
h1 { font-size: 52px; letter-spacing: 0.12em; }
h2 { font-size: 32px; letter-spacing: 0.08em; margin-bottom: 1.5rem; }
p { margin-bottom: 1.25rem; }
p:last-child { margin-bottom: 0; }
a { color: var(--gold); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--gold-deep); }
em { font-style: italic; }

.section { padding: var(--section-padding) 24px; }
.section--white { background-color: var(--white); }
.container { max-width: var(--content-width); margin: 0 auto; }
.text-center { text-align: center; }

.rule { width: 80px; height: 1px; background-color: var(--rule); margin: 2rem auto; border: none; }
.rule--small { width: 40px; margin: 1.5rem auto; }

/* Nav */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0;
  background-color: rgba(250, 248, 245, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000; padding: 16px 24px;
  border-bottom: 1px solid var(--rule);
}
.site-nav__inner { max-width: 900px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; }
.site-nav__logo { font-family: var(--font-display); font-size: 18px; font-weight: 600; letter-spacing: 0.08em; color: var(--charcoal); text-decoration: none; }
.site-nav__logo:hover { color: var(--gold); }
.site-nav__links { display: flex; gap: 2rem; font-family: var(--font-ui); font-size: 13px; }
.site-nav__links a { color: var(--charcoal-soft); text-decoration: none; transition: color 0.2s; }
.site-nav__links a:hover { color: var(--gold); }

/* Hero */
.hero { padding: 160px 24px 100px; text-align: center; }
.hero__epigraph { font-family: var(--font-display); font-size: 20px; font-style: italic; color: var(--charcoal-soft); max-width: 560px; margin: 0 auto 0.75rem; line-height: 1.5; }
.hero__attribution { font-family: var(--font-ui); font-size: 13px; color: var(--charcoal-soft); letter-spacing: 0.05em; margin-bottom: 2.5rem; }
.hero__title { margin-bottom: 0.5rem; color: var(--charcoal); }
.hero__subtitle { font-family: var(--font-body); font-size: 20px; font-weight: 400; color: var(--charcoal-soft); margin-bottom: 0.75rem; max-width: 520px; margin-left: auto; margin-right: auto; }
.hero__author { font-family: var(--font-ui); font-size: 13px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--charcoal-soft); margin-bottom: 2.5rem; }

.hero__covers { display: flex; justify-content: center; align-items: center; gap: 1rem; margin: 0 auto 2.5rem; }
.hero__cover { display: block; height: auto; box-shadow: rgba(0,0,0,0.12) 0 8px 40px; border-radius: 2px; transition: transform 0.3s, box-shadow 0.3s; cursor: pointer; }
.hero__cover--front, .hero__cover--back { width: 200px; }
.hero__cover:hover { transform: translateY(-4px); box-shadow: rgba(0,0,0,0.18) 0 12px 50px; }

/* Buttons */
.hero__actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-block; font-family: var(--font-ui); font-size: 14px; font-weight: 600; letter-spacing: 0.04em; padding: 14px 32px; border-radius: 3px; cursor: pointer; transition: 0.2s; border: none; }
.btn--primary { background-color: var(--gold); color: var(--white); }
.btn--primary:hover { background-color: var(--gold-deep); color: var(--white); }
.btn--outline { background-color: transparent; color: var(--gold); border: 1px solid var(--gold); }
.btn--outline:hover { background-color: var(--gold); color: var(--white); }

/* Thesis / hook */
.thesis__opener { font-family: var(--font-display); font-size: 26px; font-weight: 400; margin-bottom: 1.5rem; }
.thesis__close { font-family: var(--font-display); font-size: 22px; font-style: italic; color: var(--charcoal); margin-top: 2rem; }

/* Concept list */
.parts-box { border: 1px solid var(--rule); padding: 2rem 2.5rem; margin: 2rem 0; text-align: left; }
.parts-list { list-style: none; }
.parts-list li { font-family: var(--font-body); font-size: 16px; padding: 0.4rem 0; display: flex; gap: 1rem; }
.parts-list__num { font-family: var(--font-ui); font-size: 12px; letter-spacing: 0.05em; color: var(--gold); min-width: 68px; }
.parts-list__title { color: var(--charcoal); }

.text-link { font-family: var(--font-ui); font-size: 14px; letter-spacing: 0.02em; }
.text-link::after { content: " \2192"; }

/* One breath keepsake */
.breath { border: 1px solid var(--rule); background: var(--white); padding: 2.5rem; margin: 2rem auto 0; max-width: 560px; text-align: left; }
.breath p { font-family: var(--font-display); font-size: 21px; line-height: 1.55; color: var(--charcoal); font-style: italic; }
.section--white .breath { background: var(--cream); }

/* Concepts glossary */
.concepts-list { list-style: none; text-align: left; margin-top: 1.5rem; }
.concepts-list li { padding: 1rem 0; border-bottom: 1px solid var(--rule); }
.concepts-list li:last-child { border-bottom: none; }
.concepts-list dt { font-family: var(--font-display); font-size: 22px; font-weight: 600; color: var(--charcoal); margin-bottom: 0.15rem; }
.concepts-list dd { font-size: 16px; color: var(--charcoal-soft); }

/* FAQ */
.faq { text-align: left; margin-top: 1.5rem; }
.faq dt { font-family: var(--font-display); font-size: 24px; font-weight: 600; color: var(--charcoal); margin-top: 1.75rem; }
.faq dt:first-of-type { margin-top: 0; }
.faq dd { font-size: 17px; color: var(--charcoal-soft); margin-top: 0.5rem; }

/* Author */
.author { display: flex; gap: 3rem; align-items: flex-start; text-align: left; }
.author__photo { width: 160px; height: 160px; border-radius: 50%; flex-shrink: 0; object-fit: cover; }
.author__bio p { font-size: 17px; }

/* Purchase */
.purchase-details { font-family: var(--font-ui); font-size: 15px; color: var(--charcoal); margin-bottom: 2rem; letter-spacing: 0.02em; }
.purchase-grid { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-top: 2rem; }
.purchase-option { text-align: center; padding: 1.5rem 2rem; border: 1px solid var(--rule); border-radius: 3px; min-width: 140px; transition: 0.3s; cursor: pointer; text-decoration: none; color: var(--charcoal); }
.purchase-option:hover { border-color: var(--gold); color: var(--charcoal); transform: translateY(-4px); box-shadow: rgba(0,0,0,0.08) 0 8px 24px; }
.purchase-option__format { font-family: var(--font-ui); font-size: 13px; letter-spacing: 0.05em; text-transform: uppercase; color: var(--charcoal-soft); margin-bottom: 0.25rem; }
.purchase-option__price { font-family: var(--font-display); font-size: 24px; font-weight: 600; color: var(--charcoal); }
.purchase-option--soon { cursor: default; }
.purchase-option--soon:hover { border-color: var(--rule); transform: none; box-shadow: none; }
.purchase-option__badge { font-family: var(--font-ui); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--gold); margin-top: 0.5rem; }
.purchase-note { font-family: var(--font-ui); font-size: 14px; color: var(--charcoal-soft); margin-top: 1rem; }

/* Social share */
.social-share { display: flex; justify-content: center; gap: 1rem; margin-top: 2rem; }
.social-share__label { font-family: var(--font-ui); font-size: 13px; color: var(--charcoal-soft); margin-right: 0.5rem; align-self: center; }
.social-share__btn { display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: 50%; background-color: var(--white); border: 1px solid var(--rule); color: var(--charcoal-soft); text-decoration: none; transition: 0.2s; }
.social-share__btn:hover { background-color: var(--gold); border-color: var(--gold); color: var(--white); }
.social-share__btn svg { width: 18px; height: 18px; fill: currentColor; }
.section--white .social-share__btn { background-color: var(--cream); }

/* Footer */
.footer { padding: 60px 24px; text-align: center; }
.footer__copy { font-family: var(--font-ui); font-size: 13px; color: var(--charcoal-soft); margin-bottom: 0.75rem; }
.footer__links { font-family: var(--font-ui); font-size: 13px; }
.footer__links a { color: var(--gold); margin: 0 0.75rem; }

/* Lightbox */
.lightbox { display: none; position: fixed; inset: 0; width: 100%; height: 100%; background-color: rgba(0,0,0,0.9); z-index: 2000; justify-content: center; align-items: center; opacity: 0; transition: opacity 0.3s; }
.lightbox.active { display: flex; opacity: 1; }
.lightbox__img { max-width: 90%; max-height: 90%; box-shadow: rgba(0,0,0,0.5) 0 20px 60px; border-radius: 4px; transform: scale(0.9); transition: transform 0.3s; }
.lightbox.active .lightbox__img { transform: scale(1); }
.lightbox__close { position: absolute; top: 24px; right: 32px; font-size: 40px; color: white; cursor: pointer; opacity: 0.7; transition: opacity 0.2s; font-family: var(--font-ui); font-weight: 300; line-height: 1; }
.lightbox__close:hover { opacity: 1; }
.lightbox__nav { position: absolute; bottom: 24px; display: flex; gap: 1rem; }
.lightbox__nav-btn { font-family: var(--font-ui); font-size: 13px; color: white; background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.3); padding: 10px 20px; border-radius: 3px; cursor: pointer; transition: 0.2s; }
.lightbox__nav-btn:hover { background: rgba(255,255,255,0.2); }
.lightbox__nav-btn.active { background: var(--gold); border-color: var(--gold); }

/* Reading page (opening letter) */
.reading { max-width: var(--reading-width); margin: 0 auto; padding: 140px 24px 100px; }
.reading__kicker { font-family: var(--font-ui); font-size: 13px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--gold); text-align: center; margin-bottom: 0.75rem; }
.reading__title { font-family: var(--font-display); font-size: 40px; letter-spacing: 0.06em; text-align: center; margin-bottom: 2.5rem; }
.reading p { margin-bottom: 1.35rem; }
.reading__salutation { font-style: italic; }
.reading__back { text-align: center; margin-top: 3rem; }

/* Animations */
@keyframes fadeInUp { 0% { opacity: 0; transform: translateY(20px); } 100% { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { 0% { opacity: 0; } 100% { opacity: 1; } }
.hero__epigraph { animation: 1s ease 0.2s 1 normal forwards fadeIn; opacity: 0; }
.hero__title { animation: 0.8s ease 0.4s 1 normal forwards fadeInUp; opacity: 0; }
.hero__subtitle { animation: 0.8s ease 0.6s 1 normal forwards fadeIn; opacity: 0; }
.hero__covers { animation: 0.8s ease 0.7s 1 normal forwards fadeInUp; opacity: 0; }

@media (max-width: 768px) {
  :root { --section-padding: 70px; }
  h1 { font-size: 34px; }
  h2 { font-size: 26px; }
  body { font-size: 17px; }
  .hero { padding: 120px 24px 70px; }
  .hero__epigraph { font-size: 18px; }
  .hero__subtitle { font-size: 18px; }
  .thesis__opener { font-size: 22px; }
  .thesis__close { font-size: 20px; }
  .author { flex-direction: column; align-items: center; text-align: center; }
  .author__photo { margin-bottom: 1.5rem; }
  .parts-box { padding: 1.5rem; }
  .purchase-grid { flex-direction: column; align-items: center; }
  .purchase-option { width: 100%; max-width: 280px; }
  .site-nav__links { gap: 1rem; font-size: 12px; }
  .hero__covers { gap: 0.75rem; }
  .hero__cover--front, .hero__cover--back { width: 140px; }
  .social-share { flex-wrap: wrap; }
  .breath { padding: 1.75rem; }
  .breath p { font-size: 19px; }
  .reading__title { font-size: 30px; }
}