/* =============================================
   DESIGN TOKENS
   ============================================= */
:root{
  --ink:    #0E0E0E;
  --cream:  #EDEBE6;
  --white:  #FFFFFF;
  --accent: #C8C4BC;
  --text-dark: #1A1A1A;
  --text-light: #FFFFFF;
  --serif: 'Playfair Display', Georgia, serif;
  --sans:  'Barlow Condensed', 'Arial Narrow', sans-serif;
  --body:  'Barlow', Arial, sans-serif;
}

/* =============================================
   RESET & BASE
   ============================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { background: var(--cream); color: var(--text-dark); font-family: var(--body); line-height: 1.5; overflow-x: hidden; }
img { display: block; max-width: 100%; height: auto; }
a { text-decoration: none; color: inherit; }

/* =============================================
   NAV
   ============================================= */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 48px;
  background: rgba(14,14,14,0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background 0.3s;
}
.nav-logo {
  font-family: var(--serif); font-size: 1rem; font-weight: 400;
  color: var(--white); letter-spacing: 0.12em; text-transform: uppercase;
  line-height: 1.2;
}
.nav-logo span { display: block; font-size: 0.65rem; letter-spacing: 0.25em; opacity: 0.6; font-family: var(--sans); }
.nav-links { display: flex; gap: 36px; list-style: none; }
.nav-links a {
  font-family: var(--sans); font-size: 0.78rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: rgba(255,255,255,0.75);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--white); }
.nav-cta {
  font-family: var(--sans); font-size: 0.78rem; letter-spacing: 0.18em;
  text-transform: uppercase; background: var(--white); color: var(--ink);
  padding: 10px 24px; border-radius: 2px;
  transition: background 0.2s, color 0.2s;
}
.nav-cta:hover { background: var(--accent); }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--white); transition: all 0.3s; }

/* =============================================
   HERO
   ============================================= */
#hero {
  min-height: 100vh;
  background: var(--ink);
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 0;
  padding-top: 80px;
}
.hero-book {
  display: flex; align-items: center; justify-content: center;
  padding: 60px 40px 60px 80px;
}
.hero-book img {
  width: 100%; max-width: 420px;
  border-radius: 12px;
  box-shadow: 0 40px 100px rgba(0,0,0,0.7), 0 8px 24px rgba(0,0,0,0.5);
  transform: perspective(1000px) rotateY(-4deg) rotateX(2deg);
  transition: transform 0.4s ease;
}
.hero-book img:hover {
  transform: perspective(1000px) rotateY(0deg) rotateX(0deg) translateY(-6px);
}
.hero-text {
  padding: 60px 80px 60px 40px;
  color: var(--white);
}
.hero-badge {
  font-family: var(--sans); font-size: 0.72rem; letter-spacing: 0.3em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 24px;
  display: flex; align-items: center; gap: 12px;
}
.hero-badge::after {
  content: ''; flex: 1; height: 1px; background: var(--accent); max-width: 60px;
}
h1.hero-title {
  font-family: var(--serif); font-size: clamp(3rem, 5vw, 5.5rem);
  font-weight: 900; line-height: 1; letter-spacing: -0.02em;
  margin-bottom: 8px; text-transform: uppercase;
}
h1.hero-title em { font-style: italic; font-weight: 400; }
.hero-sub {
  font-family: var(--sans); font-size: 1rem; letter-spacing: 0.35em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 36px; margin-top: 12px;
}
.hero-desc {
  font-family: var(--body); font-size: 0.92rem; line-height: 1.75;
  color: rgba(255,255,255,0.65); max-width: 420px; margin-bottom: 48px;
  text-transform: uppercase; letter-spacing: 0.04em;
}
.btn-primary {
  display: inline-block;
  font-family: var(--sans); font-size: 0.8rem; letter-spacing: 0.25em;
  text-transform: uppercase; background: var(--white); color: var(--ink);
  padding: 16px 40px; border-radius: 2px;
  transition: background 0.25s, transform 0.25s;
}
.btn-primary:hover { background: var(--accent); transform: translateY(-2px); }
.hero-meta {
  display: flex; gap: 40px; margin-top: 52px;
  border-top: 1px solid rgba(255,255,255,0.12); padding-top: 32px;
}
.hero-meta-item { font-family: var(--sans); text-transform: uppercase; }
.hero-meta-item .meta-value {
  font-size: 1.8rem; font-weight: 600; color: var(--white); display: block; line-height: 1;
}
.hero-meta-item .meta-label {
  font-size: 0.65rem; letter-spacing: 0.25em; color: rgba(255,255,255,0.45); margin-top: 4px; display: block;
}

/* =============================================
   SECTION SHARED
   ============================================= */
section { position: relative; }
.section-tag {
  font-family: var(--sans); font-size: 0.68rem; letter-spacing: 0.3em;
  text-transform: uppercase; color: var(--accent);
  margin-bottom: 20px; display: flex; align-items: center; gap: 12px;
}
.section-tag::before {
  content: ''; width: 32px; height: 1px; background: var(--accent);
}

/* =============================================
   OVERVIEW
   ============================================= */
#overview {
  background: var(--cream);
  padding: 100px 80px;
}
.overview-header {
  display: flex; gap: 32px; margin-bottom: 64px;
  align-items: flex-start;
}
.overview-photo-large {
  flex: 0 0 340px; height: 420px; object-fit: cover;
  filter: grayscale(100%) contrast(1.05);
}
.overview-photo-small {
  flex: 0 0 220px; height: 280px; object-fit: cover;
  align-self: flex-end; margin-left: auto;
  filter: grayscale(100%) contrast(1.05);
}
.overview-header-rule {
  width: 100%; height: 1px; background: var(--accent); margin-bottom: 48px;
}
h2.section-title {
  font-family: var(--serif); font-size: clamp(2.8rem, 5vw, 5rem);
  font-weight: 900; line-height: 1.0; text-transform: uppercase; letter-spacing: -0.01em;
  margin-bottom: 40px;
  color: var(--text-dark);
}
.overview-body {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
}
.overview-body p {
  font-family: var(--sans); font-size: 0.82rem; letter-spacing: 0.08em;
  text-transform: uppercase; line-height: 2; text-align: justify; color: var(--text-dark);
}
.overview-footer-rule {
  width: 100%; height: 1px; background: var(--accent); margin-top: 60px;
}
.overview-footer {
  display: flex; justify-content: space-between;
  font-family: var(--sans); font-size: 0.68rem; letter-spacing: 0.2em;
  text-transform: uppercase; color: rgba(26,26,26,0.5);
  margin-top: 16px;
}

/* =============================================
   HOW TO USE
   ============================================= */
#how-to-use {
  background: var(--white);
  padding: 100px 80px;
}
.howto-inner {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start;
}
.howto-text h2 { margin-bottom: 40px; }
.howto-text p {
  font-family: var(--sans); font-size: 0.82rem; letter-spacing: 0.08em;
  text-transform: uppercase; line-height: 2.1; text-align: justify;
  color: var(--text-dark); margin-bottom: 28px;
}
.howto-img {
  width: 100%; height: 580px; object-fit: cover;
  /* filter: grayscale(100%) contrast(1.02); */
}
.howto-footer {
  display: flex; justify-content: space-between; margin-top: 60px;
  font-family: var(--sans); font-size: 0.68rem; letter-spacing: 0.2em;
  text-transform: uppercase; color: rgba(26,26,26,0.4);
  border-top: 1px solid var(--accent); padding-top: 16px;
}

/* =============================================
   AUTHOR
   ============================================= */
#author {
  background: var(--ink);
  padding: 100px 80px;
  color: var(--white);
}
.author-inner {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px;
}
.author-photos { display: flex; flex-direction: column; gap: 0; }
.author-polaroid {
  background: var(--white); padding: 16px 16px 48px 16px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.6);
  display: inline-block; max-width: 300px;
  transform: rotate(-1.5deg);
}
.author-polaroid img { width: 100%; height: 350px; object-fit: cover; filter: sepia(0.1) contrast(1.1); }
.author-photo-secondary {
  width: 200px; height: 240px; object-fit: cover;
  filter: grayscale(100%); margin-left: auto; margin-top: -40px;
  border: 3px solid var(--ink);
  box-shadow: 0 4px 24px rgba(0,0,0,0.5);
}
.author-text { padding-top: 20px; }
.author-label {
  font-family: var(--sans); font-size: 0.68rem; letter-spacing: 0.3em;
  text-transform: uppercase; color: rgba(255,255,255,0.45); margin-bottom: 8px;
  text-align: right;
}
h2.author-title {
  font-family: var(--serif); font-size: clamp(2.2rem, 3.5vw, 3.5rem);
  font-weight: 900; line-height: 1.05; text-transform: uppercase;
  margin-bottom: 36px; margin-top: 48px;
}
.author-bio {
  font-family: var(--sans); font-size: 0.82rem; letter-spacing: 0.08em;
  text-transform: uppercase; line-height: 2.1; text-align: justify;
  color: rgba(255,255,255,0.7); margin-bottom: 32px;
}
.author-photo-smile {
  width: 100%; height: 240px; object-fit: cover; margin-top: 20px;
  filter: sepia(0.08) contrast(1.08);
}

/* =============================================
   CONCEPTS
   ============================================= */
#concepts {
  background: var(--cream);
  padding: 100px 80px;
  text-align: center;
}
h2.concepts-title {
  font-family: var(--serif); font-size: clamp(4rem, 8vw, 7.5rem);
  font-weight: 900; letter-spacing: -0.02em; text-transform: uppercase;
  line-height: 1; margin-bottom: 32px;
}
.concepts-desc {
  font-family: var(--sans); font-size: 0.82rem; letter-spacing: 0.1em;
  text-transform: uppercase; line-height: 1.9; max-width: 640px; margin: 0 auto 48px;
  text-align: justify;
}
.concepts-photo {
  width: 100%; max-width: 840px; height: 480px; object-fit: cover; margin: 0 auto;
  filter: grayscale(100%) contrast(1.05);
}
.concepts-footer {
  display: flex; justify-content: space-between; margin-top: 48px;
  font-family: var(--sans); font-size: 0.68rem; letter-spacing: 0.2em;
  text-transform: uppercase; color: rgba(26,26,26,0.45);
  border-top: 1px solid var(--accent); padding-top: 16px;
  max-width: 840px; margin: 48px auto 0;
}

/* =============================================
   TESTIMONIALS
   ============================================= */
#testimonials {
  background: var(--ink);
  padding: 100px 80px;
  color: var(--white);
}
#testimonials h2 {
  font-family: var(--serif); font-size: clamp(2rem, 3vw, 2.8rem);
  font-weight: 400; text-align: center; margin-bottom: 64px; font-style: italic;
  color: var(--accent);
}
.testimonials-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
}
.testimonial-card {
  border: 1px solid rgba(200,196,188,0.2); padding: 40px 32px;
  position: relative;
  transition: border-color 0.3s;
}
.testimonial-card:hover { border-color: var(--accent); }
.testimonial-card::before {
  content: '\201C'; font-family: var(--serif); font-size: 5rem; line-height: 1;
  color: var(--accent); opacity: 0.3; position: absolute; top: 16px; left: 28px;
}
.testimonial-text {
  font-family: var(--sans); font-size: 0.85rem; letter-spacing: 0.06em;
  text-transform: uppercase; line-height: 2; color: rgba(255,255,255,0.75);
  margin-bottom: 28px; padding-top: 24px;
}
.testimonial-author {
  font-family: var(--sans); font-size: 0.7rem; letter-spacing: 0.25em; text-transform: uppercase;
}
.testimonial-author strong { color: var(--white); display: block; margin-bottom: 4px; }
.testimonial-author span { color: rgba(255,255,255,0.4); }
.stars { color: var(--accent); font-size: 0.75rem; letter-spacing: 0.1em; margin-bottom: 12px; }

/* =============================================
   PRICING
   ============================================= */
#pricing {
  background: var(--cream);
  padding: 120px 80px;
  text-align: center;
}
.pricing-eyebrow {
  font-family: var(--sans); font-size: 0.72rem; letter-spacing: 0.35em;
  text-transform: uppercase; color: rgba(26,26,26,0.5); margin-bottom: 16px;
}
#pricing h2 {
  font-family: var(--serif); font-size: clamp(2.4rem, 4vw, 3.8rem);
  font-weight: 900; text-transform: uppercase; margin-bottom: 60px;
}
.pricing-card {
  max-width: 560px; margin: 0 auto;
  background: var(--white);
  border: 1px solid var(--accent);
  padding: 60px 48px;
  position: relative;
}
.pricing-badge {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: var(--white);
  font-family: var(--sans); font-size: 0.65rem; letter-spacing: 0.25em;
  text-transform: uppercase; padding: 6px 20px;
}
.pricing-price {
  font-family: var(--serif); font-size: 5.5rem; font-weight: 900; line-height: 1;
  color: var(--ink); margin-bottom: 4px;
}
.pricing-price sup { font-size: 2rem; vertical-align: top; margin-top: 1rem; }
.pricing-note {
  font-family: var(--sans); font-size: 0.7rem; letter-spacing: 0.2em;
  text-transform: uppercase; color: rgba(26,26,26,0.45); margin-bottom: 40px;
}
.pricing-features {
  list-style: none; margin-bottom: 44px; text-align: left;
}
.pricing-features li {
  font-family: var(--sans); font-size: 0.82rem; letter-spacing: 0.1em;
  text-transform: uppercase; padding: 14px 0;
  border-bottom: 1px solid rgba(200,196,188,0.5);
  display: flex; align-items: center; gap: 12px; color: var(--text-dark);
}
.pricing-features li::before {
  content: '✓'; color: var(--ink); font-size: 0.8rem; font-weight: 700;
  flex-shrink: 0;
}
.btn-buy {
  display: block; width: 100%;
  font-family: var(--sans); font-size: 0.85rem; letter-spacing: 0.25em;
  text-transform: uppercase; background: var(--ink); color: var(--white);
  padding: 20px 40px; border: none; cursor: pointer;
  transition: background 0.25s, letter-spacing 0.25s;
}
.btn-buy:hover { background: #2a2a2a; letter-spacing: 0.35em; }
.pricing-guarantee {
  font-family: var(--body); font-size: 0.78rem; color: rgba(26,26,26,0.45);
  margin-top: 20px; font-style: italic;
}

/* =============================================
   PRODUCT CARDS
   ============================================= */
#hero-mini {
  background: var(--ink);
  padding: 180px 80px 100px;
  text-align: center;
  color: var(--white);
}
#hero-mini .hero-badge {
  justify-content: center;
}
#hero-mini .hero-title {
  font-size: clamp(3rem, 7vw, 6rem);
  margin-bottom: 24px;
}
#hero-mini .hero-desc {
  margin: 0 auto;
  max-width: 600px;
  opacity: 0.7;
}
#hero-mini .btn-primary {
  margin-top: 40px;
  display: inline-block;
}

#products {
  background: var(--cream);
  padding: 120px 80px;
  text-align: center;
}
#products .section-tag {
  justify-content: center;
  margin-bottom: 24px;
}
#products .section-title {
  text-align: center;
}
.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 48px;
  max-width: 1100px;
  margin: 60px auto 0;
}
.product-card {
  background: transparent;
  border: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  transition: transform 0.4s ease;
  overflow: visible;
  text-align: left;
}

/* Product result badge */
.product-result-badge {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--white);
  font-family: var(--sans);
  font-size: 0.6rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  padding: 6px 16px;
  white-space: nowrap;
  z-index: 2;
}

/* Product includes list */
.product-includes {
  list-style: none;
  margin-bottom: 20px;
  padding: 0;
}
.product-includes li {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(26,26,26,0.55);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
}
.product-includes li::before {
  content: '\2014';
  position: absolute;
  left: 0;
  color: var(--accent);
}
.product-card:hover {
  transform: translateY(-12px);
}
.product-image-wrapper {
  position: relative;
  width: 100%;
  height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 1200px;
  padding: 30px;
  margin-bottom: 20px;
}
.product-image {
  display: block;
  width: 100%;
  max-width: 340px;
  height: auto;
  aspect-ratio: 420/530;
  object-fit: cover;
  border-radius: 8px;
  filter: grayscale(100%) contrast(1.05);
  box-shadow: 0 30px 60px rgba(0,0,0,0.4), 0 8px 24px rgba(0,0,0,0.3);
  transform: rotateY(-6deg) rotateX(2deg);
  transition: transform 0.6s cubic-bezier(0.23, 1, 0.32, 1), 
              filter 0.6s ease, 
              box-shadow 0.6s ease;
}
/* Disable complex transforms on mobile if they cause rendering issues */
@media (max-width: 900px) {
  .product-image {
    transform: none !important;
    filter: none !important;
  }
}
.product-card:hover .product-image {
  transform: rotateY(0deg) rotateX(0deg) scale(1.02);
  filter: grayscale(0%) contrast(1);
  box-shadow: 0 40px 100px rgba(0,0,0,0.5), 0 12px 36px rgba(0,0,0,0.4);
}
.product-content {
  padding: 20px 10px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}
.product-tag {
  font-family: var(--sans);
  font-size: 0.65rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.product-name {
  font-family: var(--serif);
  font-size: 2.2rem;
  font-weight: 900;
  text-transform: uppercase;
  line-height: 1.1;
  margin-bottom: 16px;
  color: var(--ink);
}
.product-description {
  font-family: var(--body);
  font-size: 0.88rem;
  line-height: 1.75;
  color: rgba(26,26,26,0.6);
  margin-bottom: 24px;
  flex-grow: 0;
}
.product-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid rgba(200,196,188,0.45);
  margin-top: auto;
}
.product-price {
  font-family: var(--serif);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--ink);
}
.product-price span {
  font-size: 0.9rem;
  font-family: var(--sans);
  vertical-align: top;
  margin-right: 2px;
}
.btn-card {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--white);
  padding: 12px 24px;
  border: none;
  cursor: pointer;
  transition: background 0.3s ease;
}
.btn-card:hover {
  background: var(--accent);
  color: var(--ink);
}

/* =============================================
   FOOTER
   ============================================= */
footer {
  background: var(--ink);
  padding: 80px 80px 40px;
  color: var(--white);
}
.footer-inner {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 60px;
}
.footer-brand .footer-logo {
  font-family: var(--serif); font-size: 1.2rem; letter-spacing: 0.1em;
  text-transform: uppercase; margin-bottom: 16px;
}
.footer-brand p {
  font-family: var(--body); font-size: 0.82rem; color: rgba(255,255,255,0.45);
  line-height: 1.75; max-width: 280px;
}
.footer-col h4 {
  font-family: var(--sans); font-size: 0.68rem; letter-spacing: 0.3em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 20px;
}
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a {
  font-family: var(--body); font-size: 0.82rem;
  color: rgba(255,255,255,0.5); transition: color 0.2s;
}
.footer-col ul li a:hover { color: var(--white); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 32px;
  display: flex; justify-content: space-between; align-items: center;
}
.footer-bottom p {
  font-family: var(--body); font-size: 0.75rem; color: rgba(255,255,255,0.3);
  letter-spacing: 0.05em;
}
.social-links { display: flex; gap: 20px; }
.social-link {
  width: 38px; height: 38px; border: 1px solid rgba(255,255,255,0.2);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--sans); font-size: 0.65rem; letter-spacing: 0.1em;
  color: rgba(255,255,255,0.5); text-transform: uppercase;
  transition: border-color 0.2s, color 0.2s;
}
.social-link:hover { border-color: var(--accent); color: var(--accent); }

/* =============================================
   TRUST SECTION
   ============================================= */
#trust {
  background: var(--ink);
  padding: 100px 80px;
  color: var(--white);
  text-align: center;
}
#trust .section-tag { color: var(--accent); margin-bottom: 48px; }
#trust .section-tag::before { background: var(--accent); }

.trust-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  max-width: 900px;
  margin: 0 auto 64px;
}
.trust-quote {
  border-left: 1px solid rgba(200,196,188,0.3);
  padding-left: 32px;
  text-align: left;
}
.trust-quote p {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-style: italic;
  line-height: 1.8;
  color: rgba(255,255,255,0.8);
  margin-bottom: 16px;
}
.trust-quote cite {
  font-family: var(--sans);
  font-size: 0.65rem;
  letter-spacing: 0.25em;
  color: rgba(255,255,255,0.4);
  font-style: normal;
}
.trust-stats {
  display: flex;
  justify-content: center;
  gap: 80px;
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 48px;
}
.trust-stat { text-align: center; }
.trust-stat-value {
  display: block;
  font-family: var(--serif);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1;
  margin-bottom: 8px;
}
.trust-stat-label {
  font-family: var(--sans);
  font-size: 0.6rem;
  letter-spacing: 0.3em;
  color: rgba(255,255,255,0.4);
}

/* =============================================
   FAQ SECTION
   ============================================= */
#faq {
  background: var(--white);
  padding: 100px 80px;
}
#faq .section-title { margin-bottom: 60px; }

.faq-grid {
  max-width: 720px;
  margin: 0 auto;
}
.faq-item {
  border-bottom: 1px solid var(--accent);
}
.faq-item summary {
  font-family: var(--sans);
  font-size: 0.82rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 24px 0;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--ink);
  transition: color 0.2s;
}
.faq-item summary:hover { color: rgba(14,14,14,0.6); }
.faq-item summary::after {
  content: '+';
  font-family: var(--sans);
  font-size: 1.2rem;
  font-weight: 300;
  transition: transform 0.3s;
  flex-shrink: 0;
  margin-left: 16px;
}
.faq-item[open] summary::after {
  transform: rotate(45deg);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item p {
  font-family: var(--body);
  font-size: 0.88rem;
  line-height: 1.75;
  color: rgba(26,26,26,0.6);
  padding: 0 0 24px;
  max-width: 600px;
}

/* =============================================
   FINAL CTA SECTION
   ============================================= */
#final-cta {
  background: var(--ink);
  padding: 120px 80px;
  text-align: center;
  color: var(--white);
}
.final-cta-eyebrow {
  font-family: var(--sans);
  font-size: 0.68rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
}
.final-cta-title {
  font-family: var(--serif);
  font-size: clamp(2.4rem, 5vw, 4.5rem);
  font-weight: 900;
  text-transform: uppercase;
  line-height: 1.05;
  margin-bottom: 20px;
}
.final-cta-desc {
  font-family: var(--body);
  font-size: 0.92rem;
  color: rgba(255,255,255,0.5);
  margin-bottom: 48px;
}
#final-cta .btn-primary {
  padding: 18px 48px;
  font-size: 0.82rem;
}

/* =============================================
   BUTTON MICRO-INTERACTIONS
   ============================================= */
.btn-primary,
.btn-card,
.btn-buy {
  position: relative;
  overflow: hidden;
}
.btn-primary::after,
.btn-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1);
}
.btn-primary:hover::after,
.btn-card:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* =============================================
   MOBILE STICKY CTA
   ============================================= */
.mobile-sticky-cta {
  display: none;
}

/* =============================================
   SCROLL FADE-IN ANIMATION
   ============================================= */
.reveal {
  opacity: 0; transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1; transform: translateY(0);
}

/* =============================================
   RESPONSIVE — TABLET (768px)
   ============================================= */
@media (max-width: 900px) {
  #navbar { padding: 16px 28px; }
  .nav-links, .nav-cta { display: none; }
  .hamburger { display: flex; }
  .nav-links.open {
    display: flex !important;
    flex-direction: column;
    gap: 10px;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--ink);
    justify-content: center;
    align-items: center;
    z-index: 1100;
  }
  .nav-links.open a { 
    font-size: 1.8rem; 
    padding: 15px; 
    color: var(--white); 
    width: 100%; 
    text-align: center;
    letter-spacing: 0.15em;
  }
  .hamburger { z-index: 1200; }
  
  .hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .hamburger.active span:nth-child(2) { opacity: 0; }
  .hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  #hero { grid-template-columns: 1fr; min-height: auto; padding-top: 80px; }
  .hero-book { padding: 48px 40px 24px; }
  .hero-book img { max-width: 320px; }
  .hero-text { padding: 24px 40px 60px; }
  h1.hero-title { font-size: clamp(2.4rem, 6vw, 3.5rem); }
  .hero-meta { gap: 24px; }

  #overview { padding: 72px 40px; }
  .overview-header { flex-direction: column; }
  .overview-photo-large { flex: none; width: 100%; height: 300px; }
  .overview-photo-small { display: none; }
  .overview-body { grid-template-columns: 1fr; }

  #how-to-use { padding: 72px 40px; }
  .howto-inner { grid-template-columns: 1fr; }
  .howto-img { height: 380px; }

  #author { padding: 72px 40px; }
  .author-inner { grid-template-columns: 1fr; }
  .author-polaroid { max-width: 260px; }

  #concepts { padding: 72px 40px; }
  .concepts-photo { height: 320px; }
  
  .products-grid { grid-template-columns: 1fr; gap: 48px; padding: 0 20px; }
  .product-image-wrapper { height: 420px; padding: 20px; }
  .product-image { max-width: 280px; }

  #trust { padding: 72px 40px; }
  .trust-grid { grid-template-columns: 1fr; gap: 32px; }
  .trust-stats { flex-wrap: wrap; gap: 40px; }

  #faq { padding: 72px 40px; }

  #final-cta { padding: 80px 40px; }

  #testimonials { padding: 72px 40px; }
  .testimonials-grid { grid-template-columns: 1fr; gap: 20px; }

  /* Mobile Sticky CTA */
  .mobile-sticky-cta {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 99;
    background: var(--ink);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 -4px 20px rgba(0,0,0,0.3);
  }
  .mobile-sticky-cta .mobile-price {
    font-family: var(--serif);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--white);
  }
  .mobile-sticky-cta .btn-card {
    padding: 12px 20px;
    font-size: 0.7rem;
  }

  #pricing { padding: 80px 40px; }
  .pricing-card { padding: 48px 32px; }

  footer { padding: 60px 40px 32px; }
  .footer-inner { grid-template-columns: 1fr; gap: 40px; }
}

/* =============================================
   RESPONSIVE — MOBILE (375px)
   ============================================= */
@media (max-width: 480px) {
  #navbar { padding: 14px 20px; }
  .hero-book { padding: 40px 20px 20px; }
  .hero-text { padding: 16px 20px 48px; }
  h1.hero-title { font-size: 2.6rem; }
  .hero-desc { font-size: 0.8rem; }
  .hero-meta { flex-wrap: wrap; gap: 20px; }

  #overview, #how-to-use, #author, #concepts,
  #testimonials, #pricing, #products { padding: 60px 20px; }

  h2.section-title { font-size: 2.2rem; }
  h2.concepts-title { font-size: 3rem; }

  /* index.html hero-mini mobile adjustments */
  #hero-mini { padding: 120px 24px 60px; }
  #hero-mini .hero-title { font-size: 2.5rem; }
  #hero-mini .hero-desc { font-size: 0.85rem; }
  #hero-mini .btn-primary { margin-top: 32px; padding: 14px 32px; font-size: 0.75rem; }

  /* index.html product card mobile improvements */
  .products-grid { gap: 60px; }
  .product-image-wrapper { height: 500px; padding: 10px; }
  .product-image { max-width: 320px; transform: rotateY(-4deg) rotateX(1deg); }
  .product-content { padding: 10px 0; }
  .product-name { font-size: 2rem; }
  .product-description { font-size: 0.95rem; line-height: 1.6; }

  /* Trust & FAQ mobile */
  #trust { padding: 60px 20px; }
  .trust-stats { gap: 32px; }
  .trust-stat-value { font-size: 1.8rem; }

  #faq { padding: 60px 20px; }
  .faq-item summary { font-size: 0.75rem; padding: 20px 0; }

  #final-cta { padding: 80px 24px; }
  .final-cta-title { font-size: 2.2rem; }

  .pricing-price { font-size: 4rem; }

  footer { padding: 48px 20px 28px; }
  .footer-bottom { flex-direction: column; gap: 20px; text-align: center; }

  /* Extra bottom padding for sticky CTA on product page */
  footer { padding-bottom: 80px; }
}