:root {
  --navy: #0b3c5d;
  --navy-dark: #072d46;
  --teal: #1fa2a6;
  --teal-dark: #16858a;
  --ink: #17222b;
  --muted: #5a6b75;
  --white: #ffffff;
  --soft: #f5f8fa;
  --line: #dfe7ec;
  --warm: #f8f3eb;
  --max: 1180px;
  --radius: 14px;
  --shadow: 0 14px 34px rgba(11,60,93,.09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, Arial, Helvetica, sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.58;
}
a { color: var(--navy); }
img { max-width: 100%; display: block; }
.container { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}
.nav {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  color: var(--navy);
  text-decoration: none;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.02em;
}
.brand small {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: 0;
}
.nav-links { display: flex; align-items: center; gap: 22px; }
.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  font-size: .95rem;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--navy); }

.hero, .page-hero {
  background:
    radial-gradient(circle at 88% 10%, rgba(31,162,166,.13), transparent 28%),
    linear-gradient(180deg, #fff, #f8fbfc);
}
.hero { padding: 82px 0 76px; }
.page-hero { padding: 64px 0 54px; border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 48px; align-items: center; }

.eyebrow {
  display: inline-block;
  margin-bottom: 13px;
  color: var(--teal-dark);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
}
h1, h2, h3, p { margin-top: 0; }
h1 {
  margin-bottom: 20px;
  font-size: clamp(2.45rem, 5vw, 3.75rem);
  line-height: 1.05;
  letter-spacing: -.035em;
  color: var(--navy-dark);
}
.page-hero h1 { font-size: clamp(2.25rem, 4vw, 3.25rem); }
h2 {
  margin-bottom: 14px;
  font-size: clamp(1.85rem, 3vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -.025em;
  color: var(--navy-dark);
}
h3 { margin-bottom: 9px; color: var(--navy); line-height: 1.25; }
p { margin-bottom: 14px; }
.lead { max-width: 66ch; font-size: 1.08rem; color: var(--muted); }

.btn-row { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 26px; }
.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 48px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 9px;
  text-decoration: none;
  font-weight: 750;
  transition: .2s ease;
}
.btn-primary { background: var(--teal); color: white; }
.btn-primary:hover { background: var(--teal-dark); transform: translateY(-1px); }
.btn-secondary { border-color: var(--navy); color: var(--navy); background: white; }
.btn-secondary:hover { background: #eef5f7; }

.hero-panel, .card {
  background: white;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero-panel { padding: 30px; }
.card { padding: 25px; }
.card p:last-child { margin-bottom: 0; }
.card-link { display: inline-block; margin-top: 10px; font-weight: 750; text-decoration: none; }
.card-link:hover { text-decoration: underline; }

.section { padding: 70px 0; }
.section.compact { padding: 52px 0; }
.soft-bg { background: var(--soft); }
.warm-bg { background: var(--warm); }
.dark-section { background: var(--navy); color: white; }
.dark-section h2, .dark-section h3 { color: white; }
.dark-section .lead, .dark-section p { color: rgba(255,255,255,.86); }
.section-heading { max-width: 760px; margin-bottom: 34px; }

.grid-2, .grid-3, .grid-4 { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0,1fr)); }

.icon-tile {
  width: 48px; height: 48px; margin-bottom: 16px;
  display: grid; place-items: center;
  border-radius: 12px;
  background: rgba(31,162,166,.12);
  color: var(--navy);
  font-weight: 850;
}
.stat-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 25px; }
.stat { border-top: 1px solid rgba(255,255,255,.23); padding-top: 18px; }
.stat strong { display: block; font-size: 2.5rem; line-height: 1; margin-bottom: 10px; }

.feature-list, .clean-list { margin: 0; padding-left: 20px; }
.feature-list li, .clean-list li { margin: 7px 0; }
.resource-group + .resource-group { margin-top: 42px; }
.resource-meta, .article-meta {
  margin-bottom: 8px;
  color: var(--teal-dark);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .07em;
  text-transform: uppercase;
}
.card-footer { margin-top: auto; padding-top: 15px; }
.resource-card, .article-card { display: flex; flex-direction: column; min-height: 100%; }

.case-study {
  display: grid;
  grid-template-columns: .7fr 1.3fr;
  gap: 28px;
  align-items: start;
}
.case-number {
  padding: 25px;
  color: white;
  background: var(--navy);
  border-radius: var(--radius);
}
.case-number strong { display: block; font-size: 2.6rem; line-height: 1; margin-bottom: 8px; }

.quote {
  padding-left: 20px;
  border-left: 4px solid var(--teal);
  font-size: 1.06rem;
}
.book-grid { display: grid; grid-template-columns: .65fr 1.35fr; gap: 30px; align-items: center; }
.book-cover-placeholder {
  min-height: 320px;
  padding: 28px;
  display: grid;
  place-items: center;
  text-align: center;
  color: white;
  background: linear-gradient(145deg, var(--navy), var(--teal));
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.book-cover-placeholder strong { font-size: 1.65rem; }

.cta-section { text-align: center; background: linear-gradient(135deg, var(--teal), var(--teal-dark)); color: white; }
.cta-section h2 { color: white; }
.cta-section .lead { margin-left: auto; margin-right: auto; color: rgba(255,255,255,.9); }
.cta-section .btn-primary { background: white; color: var(--teal-dark); }
.cta-section .btn-primary:hover { background: #f2ffff; }

.site-footer { padding: 36px 0; background: var(--navy-dark); color: rgba(255,255,255,.85); }
.footer-grid { display: grid; grid-template-columns: 1.4fr .8fr .8fr; gap: 28px; }
.site-footer a { color: white; text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.footer-links { display: grid; gap: 8px; }
.copyright { margin-top: 25px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.14); font-size: .9rem; }

.mobile-menu { display: none; }
@media (max-width: 900px) {
  .nav-links { display: none; }
  .hero-grid, .book-grid, .case-study { grid-template-columns: 1fr; }
  .grid-3, .grid-4, .stat-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media (max-width: 640px) {
  .container { width: min(var(--max), calc(100% - 28px)); }
  .hero { padding: 56px 0; }
  .page-hero { padding: 48px 0 40px; }
  .section { padding: 52px 0; }
  .grid-2, .grid-3, .grid-4, .stat-grid, .footer-grid { grid-template-columns: 1fr; }
  h1 { font-size: 2.35rem; }
}



.library-toolbar { display:flex; flex-wrap:wrap; gap:10px; margin:0 0 28px; }
.library-toolbar a { display:inline-block; padding:9px 13px; border:1px solid var(--line); border-radius:999px; text-decoration:none; font-weight:700; background:#fff; }
.library-toolbar a:hover { background:var(--soft); }
.resource-actions { display:flex; flex-wrap:wrap; gap:12px; margin-top:auto; padding-top:16px; }
.resource-actions a { font-weight:750; text-decoration:none; }
.resource-actions a:hover { text-decoration:underline; }
.paper-card, .podcast-card { display:flex; flex-direction:column; min-height:100%; }
.paper-card h3, .podcast-card h3 { margin-bottom:8px; }
.section-anchor { scroll-margin-top:90px; }
.notice { border-left:4px solid var(--teal); background:#f7fbfb; padding:18px 20px; border-radius:8px; }
.book-panel { display:grid; grid-template-columns:.7fr 1.3fr; gap:30px; align-items:center; }
.book-badge { min-height:260px; display:grid; place-items:center; text-align:center; padding:28px; color:#fff; background:linear-gradient(145deg,var(--navy),var(--teal)); border-radius:var(--radius); box-shadow:var(--shadow); }
.book-badge strong { font-size:1.5rem; }
@media(max-width:900px){ .book-panel{grid-template-columns:1fr;} }

.book-cover-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
}
.book-cover-image {
  width: min(100%, 260px);
  height: auto;
  display: block;
  border-radius: 8px;
  box-shadow: 0 14px 34px rgba(11,60,93,.16);
}
.book-cover-fallback {
  min-height: 300px;
  width: min(100%, 300px);
  align-items: center;
  justify-content: center;
  padding: 28px;
  text-align: center;
  font-weight: 800;
  color: white;
  background: linear-gradient(145deg, var(--navy), var(--teal));
  border-radius: var(--radius);
}
.affiliate-note {
  margin-top: 14px;
  font-size: .78rem;
  color: var(--muted);
}
/* Book cover size */
.book-cover-image {
    display: block;
    width: 100%;
    max-width: 280px;
    height: auto;
    margin: 0 auto;
}
.book-cover-wrap {
    max-width: 300px;
}

/* =========================
   MOBILE NAVIGATION — V2.3.4
   ========================= */
.mobile-menu-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  border: 1px solid #d9e3e8;
  background: #ffffff;
  color: #0B3C5D;
  border-radius: 8px;
  padding: 10px 14px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.mobile-menu-toggle .menu-icon {
  font-size: 1.2rem;
  line-height: 1;
}

@media (max-width: 900px) {
  .site-header .nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
  }

  .site-header .brand {
    flex: 1 1 auto;
    min-width: 0;
  }

  .mobile-menu-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .site-header .nav-links {
    display: none !important;
    flex: 1 0 100%;
    width: 100%;
    margin: 4px 0 10px;
    padding: 8px 0 4px;
    border-top: 1px solid #e6ecef;
  }

  .site-header .nav-links.mobile-open {
    display: flex !important;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-header .nav-links a {
    display: block;
    width: 100%;
    margin: 0;
    padding: 12px 4px;
    border-bottom: 1px solid #eef3f5;
  }

  .site-header .nav-links a:last-child {
    border-bottom: 0;
  }
}