/* =========================================================
   Neural Nexus Press — shared styles
   Navy + white modern theme matching the logo
   ========================================================= */

:root {
  --navy-900: #0f2238;
  --navy-800: #1a3656;
  --navy-700: #234a73;
  --navy-600: #2c5d92;
  --navy-500: #4a7ba8;
  --navy-100: #e6edf5;
  --navy-50:  #f4f7fb;

  --ink:       #0f2238;
  --ink-soft:  #4a5a72;
  --line:      #d6dee9;
  --bg:        #ffffff;
  --bg-soft:   #f4f7fb;
  --paper:     #ffffff;

  --accent:    #f5b942;     /* warm gold for hover/CTA highlights */
  --accent-2:  #ffd984;

  --shadow-sm: 0 1px 2px rgba(15, 34, 56, 0.06), 0 2px 8px rgba(15, 34, 56, 0.04);
  --shadow-md: 0 4px 14px rgba(15, 34, 56, 0.08), 0 8px 28px rgba(15, 34, 56, 0.06);
  --shadow-lg: 0 12px 30px rgba(15, 34, 56, 0.10), 0 24px 60px rgba(15, 34, 56, 0.08);

  --radius-sm: 6px;
  --radius:    12px;
  --radius-lg: 20px;

  --max-w: 1200px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--navy-700); text-decoration: none; }
a:hover { color: var(--navy-900); }

img { max-width: 100%; display: block; }

h1, h2, h3, h4 {
  font-family: "Inter", system-ui, sans-serif;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--navy-900);
  margin: 0 0 0.5em;
}
h1 { font-size: clamp(2.2rem, 4.5vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); }
h3 { font-size: 1.25rem; }
p  { margin: 0 0 1em; color: var(--ink-soft); }

.wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

/* ============================== NAV ============================== */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-row {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--navy-900);
}
.brand-mark {
  width: 42px; height: 42px;
  flex: 0 0 42px;
}
.brand-name {
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  line-height: 1.05;
  text-transform: uppercase;
}
.brand-name .sub {
  display: block;
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--navy-600);
}
.nav-links {
  display: flex;
  gap: 28px;
  margin-left: auto;
  align-items: center;
}
.nav-links a {
  text-decoration: none;
  color: var(--navy-900);
  font-weight: 600;
  font-size: 15px;
  padding: 8px 4px;
  border-bottom: 2px solid transparent;
  transition: border-color .15s, color .15s;
}
.nav-links a:hover { color: var(--navy-700); border-bottom-color: var(--accent); }
.nav-links a.active { border-bottom-color: var(--navy-700); }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 999px;
  background: var(--navy-800);
  color: #fff !important;
  font-weight: 700;
  font-size: 14px;
  border: 0;
  transition: background .15s;
}
.nav-cta:hover { background: var(--navy-900); color: #fff; }

.menu-btn { display: none; }

/* ============================== HERO ============================== */
.hero {
  background: linear-gradient(180deg, var(--navy-50) 0%, var(--bg) 100%);
  padding: 72px 0 64px;
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--navy-600);
  margin-bottom: 18px;
}
.hero h1 { color: var(--navy-900); }
.hero p { font-size: 1.15rem; color: var(--ink-soft); max-width: 560px; }
.hero-actions { margin-top: 28px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-art {
  width: 100%;
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  background: radial-gradient(ellipse at center, var(--navy-100) 0%, transparent 70%);
}
.hero-art svg { width: 100%; height: 100%; max-width: 420px; }

/* ============================== BUTTONS ============================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  border: 0;
  cursor: pointer;
  transition: transform .12s ease, background .15s, color .15s, box-shadow .15s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--navy-800); color: #fff; }
.btn-primary:hover { background: var(--navy-900); color: #fff; box-shadow: var(--shadow-md); }
.btn-secondary { background: transparent; color: var(--navy-800); border: 2px solid var(--navy-800); }
.btn-secondary:hover { background: var(--navy-800); color: #fff; }
.btn-amazon {
  background: var(--accent);
  color: var(--navy-900);
  font-size: 14px;
  padding: 10px 18px;
}
.btn-amazon:hover { background: var(--accent-2); color: var(--navy-900); box-shadow: var(--shadow-sm); }

/* ============================== SECTIONS ============================== */
.section { padding: 80px 0; }
.section-soft { background: var(--bg-soft); }
.section-dark {
  background: var(--navy-900);
  color: #e8eef5;
}
.section-dark h2, .section-dark h3 { color: #fff; }
.section-dark p { color: rgba(255, 255, 255, 0.8); }

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}
.section-head .eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--navy-600);
  margin-bottom: 12px;
}

/* ============================== AUDIENCE PILLARS ============================== */
.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.pillar {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: transform .18s, box-shadow .18s, border-color .18s;
}
.pillar:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--navy-500);
}
.pillar-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: var(--navy-50);
  color: var(--navy-700);
  display: grid; place-items: center;
  margin-bottom: 18px;
}
.pillar h3 { color: var(--navy-900); margin-bottom: 8px; }

/* ============================== FEATURED BOOKS / CATALOG ============================== */
.book-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 28px;
}
.book {
  flex: 1 1 260px;
  max-width: 320px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform .18s, box-shadow .18s, border-color .18s;
}
.book:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--navy-500);
}
.book-cover {
  aspect-ratio: 6 / 9;
  border-radius: var(--radius-sm);
  background: var(--navy-50);
  margin-bottom: 18px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 6px 18px rgba(15, 34, 56, 0.18), 0 1px 2px rgba(15, 34, 56, 0.08);
}
.book-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.book-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--navy-600);
  margin-bottom: 8px;
}
.book-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--navy-50);
  color: var(--navy-700);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
}
.book h3 {
  font-size: 1.05rem;
  margin: 4px 0 8px;
  color: var(--navy-900);
  line-height: 1.3;
}
.book .subtitle {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin-bottom: 14px;
  flex: 1;
}
.book-stats {
  display: flex;
  gap: 14px;
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--line);
}
.book-stats span { display: inline-flex; align-items: center; gap: 4px; }
.book-stats strong { color: var(--navy-900); font-weight: 700; }
.book-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ============================== ABOUT / TEXT BLOCKS ============================== */
.prose { max-width: 720px; margin: 0 auto; }
.prose p { font-size: 1.05rem; color: var(--ink-soft); }
.prose blockquote {
  margin: 32px 0;
  padding: 24px 28px;
  border-left: 4px solid var(--accent);
  background: var(--navy-50);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 1.1rem;
  color: var(--navy-900);
  font-style: italic;
}

.values {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}
.value h3 { color: #fff; }
.value-num {
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 10px;
}

/* ============================== CONTACT ============================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
}
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 6px;
  color: var(--navy-900);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font: inherit;
  background: #fff;
  color: var(--ink);
  transition: border-color .15s, box-shadow .15s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--navy-600);
  box-shadow: 0 0 0 3px rgba(74, 123, 168, 0.18);
}
.form-group textarea { min-height: 130px; resize: vertical; }

.info-list { list-style: none; margin: 0; padding: 0; }
.info-list li {
  display: flex;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.info-list li:last-child { border-bottom: 0; }
.info-icon {
  flex: 0 0 38px;
  width: 38px; height: 38px;
  border-radius: 10px;
  background: var(--navy-50);
  color: var(--navy-700);
  display: grid; place-items: center;
}
.info-list strong { display: block; color: var(--navy-900); font-size: 15px; margin-bottom: 2px; }
.info-list span { font-size: 14px; color: var(--ink-soft); }

/* ============================== FOOTER ============================== */
.footer {
  background: var(--navy-900);
  color: rgba(255, 255, 255, 0.78);
  padding: 56px 0 28px;
}
.footer a { color: rgba(255, 255, 255, 0.78); }
.footer a:hover { color: var(--accent); }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 36px;
}
.footer-brand p { color: rgba(255, 255, 255, 0.65); max-width: 320px; font-size: 14px; }
.footer h4 {
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer ul li { padding: 5px 0; font-size: 14px; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
}

/* ============================== CTA BANNER ============================== */
.cta-banner {
  background: linear-gradient(135deg, var(--navy-800) 0%, var(--navy-900) 100%);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(circle at 20% 30%, rgba(245, 185, 66, 0.18) 0%, transparent 45%);
  pointer-events: none;
}
.cta-banner h2 { color: #fff; }
.cta-banner p { color: rgba(255, 255, 255, 0.82); max-width: 560px; margin: 0 auto 24px; }

/* ============================== RESPONSIVE ============================== */
@media (max-width: 880px) {
  .hero { padding: 56px 0 48px; }
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero-art { max-width: 320px; margin: 0 auto; }
  .pillars, .values, .contact-grid, .footer-grid { grid-template-columns: 1fr; }
  .footer-grid { gap: 28px; }
  .nav-links { display: none; position: absolute; top: 100%; left: 0; right: 0; background: #fff; flex-direction: column; gap: 0; border-bottom: 1px solid var(--line); padding: 8px 24px; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 14px 0; border-bottom: 1px solid var(--line); }
  .nav-links a:last-child { border-bottom: 0; }
  .menu-btn {
    display: inline-flex; margin-left: auto;
    background: transparent; border: 0; cursor: pointer;
    color: var(--navy-900); padding: 8px;
  }
  .section { padding: 56px 0; }
  .cta-banner { padding: 32px 24px; }
}