/* =====================================================
   BLACK LEAF WOOD COMPANY, LLC — Site Stylesheet
   Design: Modern Minimal | Black & White
   ===================================================== */

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --black:    #000000;
  --white:    #ffffff;
  --charcoal: #1a1a1a;
  --gray-dk:  #2c2c2c;
  --gray-md:  #666666;
  --gray-lt:  #f4f4f4;
  --border:   #e0e0e0;
  --serif:    Georgia, 'Times New Roman', serif;
  --sans:     -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --nav-h:    64px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  color: var(--charcoal);
  background: var(--white);
  line-height: 1.7;
  font-size: 17px;
}

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

/* ---- Typography ---- */
h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.8rem); }
h4 { font-size: 1.1rem; }

p  { max-width: 72ch; }

/* ---- Utility ---- */
.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }
.text-center { text-align: center; }
.text-center p { margin-left: auto; margin-right: auto; }

.btn {
  display: inline-block;
  padding: 14px 32px;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 2px solid var(--black);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.btn-dark  { background: var(--black); color: var(--white); }
.btn-dark:hover  { background: var(--gray-dk); border-color: var(--gray-dk); }
.btn-light { background: var(--white); color: var(--black); }
.btn-light:hover { background: var(--gray-lt); }
.btn-outline-white { background: transparent; color: var(--white); border-color: var(--white); }
.btn-outline-white:hover { background: var(--white); color: var(--black); }

.section { padding: 80px 0; }
.section-sm { padding: 52px 0; }
.section-dark { background: var(--black); color: var(--white); }
.section-gray { background: var(--gray-lt); }

.divider { width: 60px; height: 3px; background: var(--black); margin: 24px 0 32px; }
.divider-white { background: var(--white); }
.divider-center { margin-left: auto; margin-right: auto; }

/* ---- Navigation ---- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: var(--black);
  display: flex;
  align-items: center;
  border-bottom: 1px solid #333;
}
.nav-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--white);
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 700;
}
.nav-logo {
  width: 40px;
  height: 40px;
  background: var(--white);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
}
.nav-logo svg { width: 36px; height: 36px; }
.nav-brand-text { line-height: 1.2; }
.nav-brand-text span { display: block; font-size: 0.65rem; font-family: var(--sans); font-weight: 400; letter-spacing: 0.08em; text-transform: uppercase; color: #aaa; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}
.nav-links a {
  color: #ccc;
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--white); }
.nav-links .nav-cta a {
  background: var(--white);
  color: var(--black);
  padding: 8px 18px;
}
.nav-links .nav-cta a:hover { background: var(--gray-lt); }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}
.nav-hamburger span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--white);
  transition: all 0.3s;
}

/* Mobile nav */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0;
  background: var(--black);
  border-bottom: 1px solid #333;
  padding: 24px;
  z-index: 999;
}
.nav-mobile.open { display: block; }
.nav-mobile ul { list-style: none; }
.nav-mobile ul li { border-bottom: 1px solid #333; }
.nav-mobile ul li a {
  display: block;
  padding: 14px 0;
  color: #ccc;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.nav-mobile ul li a:hover { color: var(--white); }

/* ---- Page Header (below fixed nav) ---- */
.page-top { margin-top: var(--nav-h); }

/* ---- Hero ---- */
.hero {
  margin-top: var(--nav-h);
  min-height: calc(100vh - var(--nav-h));
  background: var(--black);
  color: var(--white);
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('hero-bg.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.18;
}
.hero-content {
  position: relative;
  z-index: 2;
  padding: 80px 0;
}
.hero-eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #aaa;
  margin-bottom: 20px;
  font-family: var(--sans);
}
.hero h1 { color: var(--white); margin-bottom: 24px; }
.hero .lead {
  font-size: 1.2rem;
  color: #ccc;
  margin-bottom: 40px;
  max-width: 60ch;
}
.hero-ctas { display: flex; gap: 16px; flex-wrap: wrap; }

/* ---- Cards ---- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
  margin-top: 48px;
}
.card {
  background: var(--white);
  border: 1px solid var(--border);
  padding: 36px 32px;
  transition: box-shadow 0.2s, border-color 0.2s;
}
.card:hover { box-shadow: 0 8px 32px rgba(0,0,0,0.1); border-color: #aaa; }
.card-dark {
  background: var(--charcoal);
  border-color: #444;
  color: var(--white);
}
.card-dark:hover { border-color: #888; }
.card-icon {
  font-size: 2.2rem;
  margin-bottom: 20px;
  display: block;
}
.card h3 { margin-bottom: 12px; }
.card p  { font-size: 0.95rem; color: var(--gray-md); margin-top: 8px; }
.card-dark p { color: #aaa; }
.card-link {
  display: inline-block;
  margin-top: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-bottom: 2px solid var(--black);
  padding-bottom: 2px;
  transition: opacity 0.2s;
}
.card-dark .card-link { border-color: var(--white); color: var(--white); }
.card-link:hover { opacity: 0.6; }

/* ---- Book Feature ---- */
.book-feature {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 60px;
  align-items: center;
}
.book-cover-wrap {
  position: relative;
  width: 240px;
  flex-shrink: 0;
}
.book-cover-mockup {
  width: 240px;
  background: var(--black);
  color: var(--white);
  padding: 32px 24px;
  box-shadow: 8px 8px 0 var(--gray-md);
  font-family: var(--serif);
  min-height: 340px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.book-cover-mockup .book-title { font-size: 1.3rem; font-weight: 700; line-height: 1.3; margin-bottom: 8px; }
.book-cover-mockup .book-subtitle { font-size: 0.75rem; color: #ccc; font-style: italic; line-height: 1.5; margin-bottom: auto; }
.book-cover-mockup .book-badge {
  display: inline-block;
  background: var(--white);
  color: var(--black);
  font-size: 0.65rem;
  font-family: var(--sans);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 10px;
  margin-bottom: 16px;
  align-self: flex-start;
}
.book-cover-mockup .book-author { font-size: 0.85rem; color: #ccc; border-top: 1px solid #555; padding-top: 12px; margin-top: 12px; }
.book-cover-mockup .book-press  { font-size: 0.7rem; color: #888; margin-top: 4px; }

.book-meta { display: flex; gap: 16px; flex-wrap: wrap; margin: 20px 0 28px; }
.book-meta-item { font-size: 0.82rem; color: var(--gray-md); background: var(--gray-lt); padding: 6px 14px; }
.book-ctas { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---- Insight boxes (from manuscript callouts) ---- */
.insight-box {
  border-left: 4px solid var(--black);
  background: var(--gray-lt);
  padding: 24px 28px;
  margin: 32px 0;
}
.insight-box.dark {
  background: var(--charcoal);
  border-color: var(--white);
  color: var(--white);
}
.insight-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gray-md);
  margin-bottom: 8px;
}
.dark .insight-label { color: #aaa; }
.insight-box p { max-width: none; }

/* ---- Table ---- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 0.92rem;
}
.data-table th {
  background: var(--black);
  color: var(--white);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
.data-table tr:nth-child(even) td { background: var(--gray-lt); }

/* ---- Checklist ---- */
.checklist { list-style: none; margin: 20px 0; }
.checklist li {
  padding: 10px 0 10px 36px;
  border-bottom: 1px solid var(--border);
  position: relative;
  font-size: 0.95rem;
}
.checklist li::before {
  content: '✓';
  position: absolute;
  left: 0;
  font-weight: 700;
  color: var(--black);
}

/* ---- Content Sections ---- */
.content-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
.content-cols.wide-left { grid-template-columns: 3fr 2fr; }

.author-photo-wrap {
  position: relative;
}
.author-photo {
  width: 100%;
  max-width: 360px;
  aspect-ratio: 1;
  object-fit: cover;
  object-position: top;
  filter: grayscale(100%);
}

/* ---- Banner CTA ---- */
.banner-cta {
  background: var(--black);
  color: var(--white);
  padding: 72px 0;
  text-align: center;
}
.banner-cta h2 { color: var(--white); margin-bottom: 16px; }
.banner-cta p  { color: #ccc; max-width: 60ch; margin: 0 auto 36px; }

/* ---- Part 107 Study ---- */
.flowchart {
  background: var(--gray-lt);
  border: 1px solid var(--border);
  padding: 32px;
  margin: 32px 0;
}
.flowchart h4 { margin-bottom: 20px; font-size: 1rem; text-transform: uppercase; letter-spacing: 0.08em; }
.flow-item {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
  align-items: flex-start;
}
.flow-num {
  background: var(--black);
  color: var(--white);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}
.flow-text strong { display: block; margin-bottom: 4px; }
.flow-text p { font-size: 0.9rem; color: var(--gray-md); max-width: none; }

/* ---- Footer ---- */
.footer {
  background: var(--black);
  color: #aaa;
  padding: 56px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand h3 { color: var(--white); font-size: 1.2rem; margin-bottom: 12px; }
.footer-brand p  { font-size: 0.88rem; line-height: 1.7; color: #888; max-width: 32ch; }
.footer-col h4 {
  color: var(--white);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 20px;
  font-family: var(--sans);
}
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: #888; font-size: 0.9rem; transition: color 0.2s; }
.footer-col ul li a:hover { color: var(--white); }
.footer-bottom {
  border-top: 1px solid #333;
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: #666;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .book-feature { grid-template-columns: 1fr; }
  .book-cover-wrap { margin: 0 auto; }
  .content-cols, .content-cols.wide-left { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .section { padding: 56px 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-ctas { flex-direction: column; }
  .btn { text-align: center; }
}