:root {
  --bg: #0f1419;
  --surface: #161d25;
  --ink: #edf2f8;
  --muted: #9dafc2;
  --line: #2a3746;
  --accent: #da7d52;
  --accent-dark: #bf6843;
  --brand: #7cc8de;
  --radius: 16px;
  --shadow: 0 14px 36px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  color-scheme: dark;
  background:
    radial-gradient(circle at 10% 10%, rgba(218, 125, 82, 0.18), transparent 36%),
    radial-gradient(circle at 90% 20%, rgba(124, 200, 222, 0.14), transparent 32%),
    var(--bg);
  font-family: "Manrope", sans-serif;
  line-height: 1.6;
}

a {
  color: var(--brand);
}

.site-header,
.site-footer,
main {
  width: min(1100px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.brand-logo {
  display: block;
  height: clamp(3rem, 7vw, 5rem);
  width: auto;
  max-width: min(82vw, 420px);
}

nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

nav a {
  text-decoration: none;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  color: var(--ink);
  font-weight: 500;
}

nav a[aria-current="page"] {
  background: rgba(124, 200, 222, 0.2);
}

.hero {
  margin-top: 1.2rem;
  padding: clamp(2rem, 4vw, 3.4rem);
  background: linear-gradient(140deg, rgba(25, 34, 44, 0.95), rgba(18, 24, 31, 0.95));
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 8px);
  box-shadow: var(--shadow);
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.1fr minmax(240px, 0.8fr);
  gap: 1.2rem;
  align-items: center;
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--accent);
  font-size: 0.78rem;
}

h1,
h2,
h3 {
  font-family: "Fraunces", serif;
  line-height: 1.2;
}

.hero h1 {
  margin: 0.5rem 0 0;
  font-size: clamp(1.9rem, 6vw, 3.25rem);
  max-width: 18ch;
}

.lede {
  max-width: 64ch;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.btn {
  display: inline-block;
  border: 0;
  border-radius: 999px;
  padding: 0.66rem 1.1rem;
  text-decoration: none;
  cursor: pointer;
  font-weight: 700;
}

.btn-primary {
  color: #fff;
  background: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-dark);
}

.btn-secondary {
  color: var(--ink);
  background: rgba(237, 242, 248, 0.14);
}

.feature-grid,
.book-grid,
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.4rem 0 2rem;
}

.feature-card,
.book-card,
.video-card,
.contact-card,
.page-heading,
.reader-panel,
.toc-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.feature-card,
.book-card,
.video-card,
.page-heading,
.reader-panel,
.toc-panel,
.contact-card {
  padding: 1.1rem;
}

.hero-image {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #111821;
  min-height: 220px;
  object-fit: cover;
}

.page-heading {
  margin-top: 0.8rem;
}

.page-shell {
  padding-bottom: 1.5rem;
}

.book-card h2,
.video-card h2 {
  margin-top: 0;
}

.book-cover {
  width: 100%;
  aspect-ratio: 3 / 4;
  border-radius: 10px;
  border: 1px solid var(--line);
  margin-bottom: 0.9rem;
  background: #111821;
  object-fit: cover;
}

.book-links {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.video-card iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 0;
  border-radius: 10px;
}

.reader-shell {
  display: grid;
  grid-template-columns: minmax(220px, 280px) 1fr;
  gap: 1rem;
  align-items: start;
  margin-top: 1rem;
  padding-bottom: 1.5rem;
}

.toc-panel {
  position: sticky;
  top: 1rem;
}

.toc-panel ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-panel a {
  text-decoration: none;
}

.toc-panel li {
  margin: 0.4rem 0;
}

#book-content img {
  max-width: 100%;
}

#book-content {
  max-width: 72ch;
}

#book-content h2,
#book-content h3,
#book-content h4 {
  scroll-margin-top: 1rem;
}

.reader-meta h1 {
  margin-bottom: 0.4rem;
}

.contact-card form {
  display: grid;
  gap: 0.9rem;
}

.contact-card label {
  display: grid;
  gap: 0.25rem;
  font-weight: 600;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.65rem 0.75rem;
  font: inherit;
  color: var(--ink);
  background: #111821;
}

.hidden-field {
  position: absolute;
  left: -9999px;
}

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 1.5rem;
  padding: 0.8rem 0 1.4rem;
  color: var(--muted);
}

.error {
  border: 1px solid #7d3a37;
  background: #2c1817;
  border-radius: 10px;
  padding: 0.8rem;
}

@media (max-width: 850px) {
  .hero-layout {
    grid-template-columns: 1fr;
  }

  .reader-shell {
    grid-template-columns: 1fr;
  }

  .toc-panel {
    position: static;
  }
}