/* ============================================================
   Knowledge Hacker — Design System
   Palette: Navy + Gold + Cream
   Type: Playfair Display / Lora / Inter
   ============================================================ */

:root {
  --kh-navy:        #1B2A4A;
  --kh-navy-dark:   #111D33;
  --kh-navy-mid:    #243660;
  --kh-gold:        #C9A84C;
  --kh-gold-light:  #E2C97A;
  --kh-gold-pale:   #F5EDD6;
  --kh-cream:       #F7F4EF;
  --kh-cream-dark:  #EDE8DF;
  --kh-text:        #1A1A1A;
  --kh-muted:       #6B7280;
  --kh-border:      #DDD8CE;
  --kh-white:       #FFFFFF;
}

/* ── Base ───────────────────────────────────────────────────── */
html { scroll-behavior: smooth; }

body {
  font-family: 'Lora', Georgia, serif;
  font-size: 1.05rem;
  color: var(--kh-text);
  background-color: var(--kh-white);
}

/* ── Typography ─────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Playfair Display', Georgia, serif;
  color: var(--kh-navy);
  line-height: 1.2;
}

.ui-text,
.navbar,
.btn,
.badge,
label,
.nav-link,
.dropdown-item,
small,
.small,
caption {
  font-family: 'Inter', system-ui, sans-serif;
}

/* ── Navbar ─────────────────────────────────────────────────── */
.kh-navbar {
  background-color: var(--kh-navy);
  border-bottom: 2px solid var(--kh-gold);
  padding: 0.75rem 0;
}

.kh-navbar .navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}

.brand-logo {
  height: 40px;
  width: auto;
  flex-shrink: 0;
}

.brand-name {
  font-family: 'Playfair Display', serif;
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--kh-white);
  letter-spacing: 0.01em;
}

.kh-navbar .nav-link {
  color: rgba(255,255,255,0.80) !important;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 0.5rem 1rem !important;
  transition: color 0.2s;
}

.kh-navbar .nav-link:hover,
.kh-navbar .nav-link.active {
  color: var(--kh-gold) !important;
}

.kh-navbar .dropdown-menu {
  background-color: var(--kh-navy-dark);
  border: 1px solid rgba(201,168,76,0.25);
  border-radius: 4px;
  min-width: 160px;
}

.kh-navbar .dropdown-item {
  color: rgba(255,255,255,0.80);
  font-size: 0.875rem;
  padding: 0.6rem 1.2rem;
}

.kh-navbar .dropdown-item:hover {
  background-color: rgba(201,168,76,0.15);
  color: var(--kh-gold);
}

.kh-navbar .navbar-toggler {
  border-color: rgba(201,168,76,0.4);
}


/* ── Buttons ─────────────────────────────────────────────────── */
.kh-btn-gold {
  background-color: var(--kh-gold);
  color: var(--kh-navy);
  border: none;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 3px;
  transition: background-color 0.2s, transform 0.1s;
}

.kh-btn-gold:hover {
  background-color: var(--kh-gold-light);
  color: var(--kh-navy);
  transform: translateY(-1px);
}

.btn-primary {
  background-color: var(--kh-navy);
  border-color: var(--kh-navy);
  font-family: 'Inter', sans-serif;
}

.btn-primary:hover {
  background-color: var(--kh-navy-mid);
  border-color: var(--kh-navy-mid);
}

.btn-outline-primary {
  color: var(--kh-navy);
  border-color: var(--kh-navy);
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
}

.btn-outline-primary:hover {
  background-color: var(--kh-navy);
  border-color: var(--kh-navy);
}

/* ── Blog index ──────────────────────────────────────────────── */
.blog-header {
  background-color: var(--kh-cream);
  border-bottom: 1px solid var(--kh-border);
}

.blog-header h1 {
  font-size: 2.75rem;
}

/* Audience filter pills */
.audience-filter .btn {
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.35rem 1rem;
  font-family: 'Inter', sans-serif;
}

/* Blog post card */
.post-card {
  border: 1px solid var(--kh-border) !important;
  border-radius: 6px !important;
  transition: box-shadow 0.25s, transform 0.25s;
  background: var(--kh-white);
}

.post-card:hover {
  box-shadow: 0 8px 32px rgba(27,42,74,0.10) !important;
  transform: translateY(-3px);
}

a:has(.post-card) {
  cursor: pointer;
}

.post-card .card-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.15rem;
  color: var(--kh-navy);
}

/* ── Blog post page ──────────────────────────────────────────── */
.post-header {
  background-color: var(--kh-cream);
  border-bottom: 1px solid var(--kh-border);
}

.post-body {
  background-color: var(--kh-white);
}

.post-header h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.01em;
}

.post-meta {
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  color: var(--kh-muted);
  letter-spacing: 0.02em;
}

.blog-content {
  font-size: 1.125rem;
  line-height: 1.9;
  color: #2A2A2A;
  max-width: 68ch;
}

.blog-content p  { margin-bottom: 1.6rem; }
.blog-content h2 { font-size: 1.65rem; margin-top: 2.75rem; margin-bottom: 1rem; }
.blog-content h3 { font-size: 1.3rem;  margin-top: 2rem; margin-bottom: 0.75rem; }
.blog-content img { max-width: 100%; border-radius: 4px; }

.blog-content a {
  color: var(--kh-navy);
  text-decoration: underline;
  text-decoration-color: var(--kh-gold);
  text-underline-offset: 3px;
}

.blog-content blockquote {
  border-left: 3px solid var(--kh-gold);
  padding-left: 1.5rem;
  font-style: italic;
  color: var(--kh-muted);
}

/* ── Scroll interstitials ────────────────────────────────────── */
.post-interstitial--newsletter {
  background-color: var(--kh-white);
  border-top: 1px solid var(--kh-border);
  border-bottom: 1px solid var(--kh-border);
}

.post-interstitial--books {
  background-color: #1e2235;
}

.post-interstitial--books .btn-book-purchase {
  background-color: transparent;
  color: #fff;
  border-color: #fff;
}

.post-interstitial--books .btn-book-purchase:hover {
  background-color: var(--kh-gold);
  border-color: var(--kh-gold);
  color: var(--kh-navy-dark);
}

/* ── Newsletter bar ──────────────────────────────────────────── */
.kh-newsletter-bar {
  background-color: var(--kh-navy);
  color: var(--kh-white);
}

.kh-newsletter-bar h4 {
  font-family: 'Playfair Display', serif;
  color: var(--kh-white);
  font-size: 1.35rem;
}

.kh-newsletter-bar p { color: rgba(255,255,255,0.70); }

.kh-newsletter-bar .form-control {
  border: none;
  border-radius: 3px;
  font-family: 'Inter', sans-serif;
}

.kh-newsletter-bar .btn {
  background-color: var(--kh-gold);
  color: var(--kh-navy);
  border: none;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: 3px;
}

.kh-newsletter-bar .btn:hover { background-color: var(--kh-gold-light); color: var(--kh-navy); }

/* ── Footer ──────────────────────────────────────────────────── */
footer {
  background-color: var(--kh-navy-dark) !important;
  font-family: 'Inter', sans-serif;
}

footer h5 {
  font-family: 'Playfair Display', serif;
  color: var(--kh-white);
  font-size: 1.2rem;
}

footer h6 {
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--kh-gold);
  margin-bottom: 1rem;
}

footer a.text-muted {
  color: rgba(255,255,255,0.55) !important;
  font-size: 0.875rem;
  transition: color 0.2s;
}

footer a.text-muted:hover { color: var(--kh-gold) !important; }

footer hr { border-color: rgba(255,255,255,0.10) !important; }

footer .small { color: rgba(255,255,255,0.40) !important; }
footer .small a { color: rgba(255,255,255,0.40) !important; }
footer .small a:hover { color: var(--kh-gold) !important; }

/* ── Badges ──────────────────────────────────────────────────── */
.badge {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: 3px;
}

.badge.bg-primary    { background-color: var(--kh-navy) !important; }
.badge.bg-secondary  { background-color: var(--kh-muted) !important; }
.badge.bg-light      { background-color: var(--kh-cream-dark) !important; color: var(--kh-navy) !important; }

/* ── Email capture modal ─────────────────────────────────────── */
#emailCaptureModal .modal-content {
  border: none;
  border-radius: 8px;
  box-shadow: 0 24px 64px rgba(27,42,74,0.25);
}

#emailCaptureModal h3 {
  font-family: 'Playfair Display', serif;
  color: var(--kh-navy);
}

/* ── Brand hero (homepage) ───────────────────────────────────── */
.brand-hero {
  background-color: var(--kh-navy-dark);
  min-height: 88vh;
  padding: 4rem 1.5rem;
}

.brand-hero-inner {
  max-width: 640px;
}

.brand-hero-publisher {
  font-family: 'Inter', sans-serif;
  font-size: clamp(0.7rem, 1.2vw, 0.85rem);
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--kh-gold);
  opacity: 0.85;
  margin-bottom: 1.5rem;
}

.brand-hero-logo {
  width: clamp(160px, 25vw, 260px);
  height: auto;
  filter: drop-shadow(0 6px 32px rgba(201, 168, 76, 0.18));
}

.brand-hero-motto {
  margin-top: 2.5rem;
}

.brand-hero-latin {
  font-family: 'Playfair Display', serif;
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-style: italic;
  color: var(--kh-gold);
  letter-spacing: 0.06em;
  margin-bottom: 1rem;
}

.brand-hero-translation {
  font-family: 'Lora', serif;
  font-size: clamp(0.9rem, 1.4vw, 1.05rem);
  font-style: italic;
  color: rgba(232, 223, 200, 0.70);
  line-height: 1.8;
  margin: 0 auto;
}

/* ── Books page ──────────────────────────────────────────────── */
.books-hero {
  background-color: var(--kh-cream);
  border-bottom: 1px solid var(--kh-border);
}

.books-grid-section {
  background-color: #1e2235;
}

.book-cover-wrap {
  width: 100%;
  max-width: 280px;
}

.book-cover-img,
.book-cover-placeholder {
  display: block;
  width: 100%;
  aspect-ratio: 2 / 3;
  border-radius: 6px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.6);
}

.book-cover-img {
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.bg-cream .book-cover-img {
  border-color: var(--kh-border);
}

.book-cover-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.book-cover-placeholder--1 { background: linear-gradient(145deg, #7B2D8B, #4A0E6B); }
.book-cover-placeholder--2 { background: linear-gradient(145deg, #1A6B8A, #0D3D52); }
.book-cover-placeholder--3 { background: linear-gradient(145deg, #2D7A3A, #174020); }

.book-placeholder-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
  text-align: center;
  line-height: 1.3;
}

.btn-book-purchase {
  display: inline-block;
  width: 100%;
  max-width: 280px;
  background-color: #fff;
  color: #111;
  border: 2px solid #fff;
  border-radius: 100px;
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.85rem 1rem;
  text-decoration: none;
  transition: background-color 0.2s, color 0.2s, border-color 0.2s, transform 0.15s;
}

.btn-book-purchase:hover {
  background-color: var(--kh-gold);
  border-color: var(--kh-gold);
  color: var(--kh-navy-dark);
  transform: translateY(-2px);
}

.kh-product-listing .btn-book-purchase {
  background-color: transparent;
  color: var(--kh-navy-dark);
  border-color: var(--kh-navy-dark);
}

.kh-product-listing .btn-book-purchase:hover {
  background-color: var(--kh-gold);
  border-color: var(--kh-gold);
  color: var(--kh-navy-dark);
}

/* ── Utility ─────────────────────────────────────────────────── */
.py-6 { padding-top: 5rem; padding-bottom: 5rem; }
.text-gold { color: var(--kh-gold); }
.bg-cream  { background-color: var(--kh-cream); }
.bg-navy   { background-color: var(--kh-navy); }
main { min-height: 60vh; }

/* ── Divider accent ──────────────────────────────────────────── */
.kh-divider {
  width: 48px;
  height: 3px;
  background-color: var(--kh-gold);
  border: none;
  margin: 1rem 0 1.5rem;
}