/* ===========================
   Shared CSS (Both Sites)
   Plain HTML + One CSS file
   =========================== */

:root {
  --container-max: 1200px;
  --space-1: 8px;
  --space-2: 12px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --font-body: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  --font-heading: "Playfair Display", Georgia, "Times New Roman", serif;
  --text-xs: 0.875rem;
  --text-sm: 0.95rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.35rem;
  --text-2xl: 2rem;
  --text-3xl: 2.5rem;
  --line-tight: 1.15;
  --line-normal: 1.55;
  --navy: #0B1F3B;
  --gold: #C9A646;
  --warm-gray: #F4F4F4;
  --dark-text: #1A1A1A;
  --white: #FFFFFF;
  --bg: var(--white);
  --surface: var(--warm-gray);
  --text: var(--dark-text);
  --muted: rgba(26, 26, 26, 0.72);
  --border: rgba(26, 26, 26, 0.14);
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0,0,0,0.08);
  --focus: 0 0 0 3px rgba(201, 166, 70, 0.35);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--line-normal);
  color: var(--text);
  background: var(--bg);
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible { outline: none; box-shadow: var(--focus); border-radius: 10px; }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) 0;
}

.logo {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: 0.2px;
  font-size: var(--text-lg);
  color: var(--navy);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-link {
  padding: 10px 12px;
  border-radius: 12px;
  font-size: var(--text-sm);
  color: rgba(11, 31, 59, 0.85);
}

.nav-link:hover { background: rgba(11, 31, 59, 0.06); }
.nav-link.active {
  background: rgba(201, 166, 70, 0.16);
  color: rgba(11, 31, 59, 1);
}

.site-header--kwl .logo { color: var(--dark-text); }
.site-header--kwl .nav-link { color: rgba(26, 26, 26, 0.82); }
.site-header--kwl .nav-link:hover { background: rgba(0, 0, 0, 0.05); }
.site-header--kwl .nav-link.active { background: rgba(0, 0, 0, 0.06); color: rgba(0, 0, 0, 0.9); }

h1, h2, h3 {
  font-family: var(--font-heading);
  margin: 0 0 var(--space-3) 0;
  line-height: var(--line-tight);
  color: var(--navy);
}

.site-header--kwl h1, .site-header--kwl h2, .site-header--kwl h3,
.site-footer--kwl h1, .site-footer--kwl h2, .site-footer--kwl h3 { color: var(--dark-text); }

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
p { margin: 0 0 var(--space-3) 0; color: var(--text); }

.content-section { padding: var(--space-6) 0; }
.publisher-line {
  margin-top: -6px;
  color: var(--muted);
  font-size: var(--text-sm);
}

.hero {
  padding: var(--space-7) 0 var(--space-5);
  background: linear-gradient(180deg, rgba(244,244,244,1) 0%, rgba(255,255,255,1) 100%);
}

.hero-label {
  display: inline-block;
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(11, 31, 59, 0.78);
  background: rgba(201, 166, 70, 0.14);
  padding: 8px 12px;
  border-radius: 999px;
  margin-bottom: var(--space-4);
}

.hero-title { margin: 0 0 var(--space-3) 0; }
.hero-subtitle {
  margin: 0;
  font-size: var(--text-lg);
  color: rgba(11, 31, 59, 0.72);
  max-width: 72ch;
}

.featured-book { padding: 0 0 var(--space-7); }
.book-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--space-5);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: var(--space-5);
}

.book-cover img {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.cover-placeholder {
  width: 100%;
  height: 320px;
  border-radius: 12px;
  border: 1px dashed var(--border);
  background: rgba(11, 31, 59, 0.03);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(11, 31, 59, 0.65);
  font-size: var(--text-sm);
}

.book-title { margin-bottom: 10px; }
.book-subtitle {
  margin: 0 0 var(--space-4) 0;
  color: rgba(11, 31, 59, 0.72);
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid transparent;
  font-weight: 600;
  font-size: var(--text-sm);
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.12s ease, background 0.12s ease, border-color 0.12s ease;
  user-select: none;
}

.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--navy);
  color: var(--white);
  border-color: rgba(11, 31, 59, 0.25);
}

.btn-primary:hover { box-shadow: 0 10px 18px rgba(11,31,59,0.14); }
.btn-secondary {
  background: rgba(11, 31, 59, 0.06);
  color: rgba(11, 31, 59, 0.92);
  border-color: rgba(11, 31, 59, 0.14);
}

.btn-secondary:hover { background: rgba(11, 31, 59, 0.09); }
.btn[disabled], .btn:disabled {
  opacity: 0.55;
  pointer-events: none;
}

.featured-section {
  margin-top: var(--space-4);
  padding: var(--space-4);
  background: rgba(201, 166, 70, 0.10);
  border: 1px solid rgba(201, 166, 70, 0.30);
  border-radius: var(--radius);
}

.roadmap-section {
  margin-top: var(--space-5);
  padding: var(--space-4);
  background: rgba(11, 31, 59, 0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.roadmap-list {
  margin: 0;
  padding-left: 18px;
}

.roadmap-list li { margin: 10px 0; }

.site-footer {
  border-top: 1px solid var(--border);
  background: rgba(244, 244, 244, 0.65);
  padding: var(--space-5) 0;
}

.site-footer--kwl { background: rgba(244, 244, 244, 0.55); }
.footer-content p {
  margin: 0 0 10px 0;
  color: rgba(26, 26, 26, 0.84);
}

.footer-title {
  font-weight: 700;
  color: rgba(26, 26, 26, 0.92);
}

.footer-parent { color: rgba(26, 26, 26, 0.78); }
.footer-disclaimer p { color: rgba(26, 26, 26, 0.78); }

@media (max-width: 860px) {
  h1 { font-size: 2.1rem; }
  .book-card { grid-template-columns: 1fr; }
  .book-cover { max-width: 360px; }
}

@media (max-width: 520px) {
  .container { padding: 0 var(--space-3); }
  .header-content { align-items: flex-start; }
  .main-nav { justify-content: flex-start; }
}