/* --- Root variables --- */
:root {
  --bg: #070708;
  --panel: #0f1112;
  --muted: #98a2a8;
  --accent: #e6e6e6;
  --maxw: 900px;
  --border-radius: 6px; /* New variable */
}

/* --- Global reset --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  margin: 0;
  background: var(--bg); /* Simplified background */
  color: var(--accent);
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Arial, serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* --- Main container --- */
.wrap {
  max-width: var(--maxw);
  margin: 32px auto;
  padding: 28px;
  background: var(--panel);
  border-radius: var(--border-radius); /* Using variable */
  box-shadow: 0 6px 18px rgba(0,0,0,0.6);
}

/* --- Header and navigation --- */
header {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.logo {
  font-weight: 700;
  font-size: 1.2em;
  letter-spacing: 0.6px;
}

nav {
  margin-left: auto;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 16px;
  font-size: 14px;
}

nav a:hover,
nav a:focus {
  color: var(--accent);
}

/* --- Headings and text --- */
h1, h2 {
  margin: 14px 0;
}

h1 {
  font-size: 1.8em;
}

h2 {
  font-size: 1.5em;
}

h3 {
  margin: 4px 0 12px; /* Increased margin */
  font-size: 1.2em;
}

p.lead {
  color: var(--muted);
  margin-top: 0;
  margin-bottom: 1em;
}

/* --- Book and text formatting --- */
.book-description p {
  margin-top: 10px;
  color: var(--muted);
}

.meta {
  color: var(--muted);
  font-size: 14px;
  margin-top: 8px;
}

.book-contents {
  margin-top: 20px;
  color: var(--muted);
}

.book-contents h3 {
  font-size: 1.1em;
  color: var(--accent);
  margin-bottom: 6px;
}

.book-contents ol {
  margin-left: 20px;
  line-height: 1.5;
  list-style-type: decimal;
}

/* --- Grid for titles and book pages --- */
.grid {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 18px;
  margin-top: 8px;
}

.cover {
  width: 120px;
  height: 180px;
  background: #222;
  border-radius: var(--border-radius); /* Using variable */
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
}

.cover img {
  width: 100%;
  min-height: 120px;
  height: auto;
  display: block;
  border-radius: var(--border-radius); /* Using variable */
}

/* --- Links --- */
.buylinks,
.links {
  margin-top: 20px;
}

.buylinks p {
  color: var(--muted);
  margin-bottom: 8px;
}

.buylinks a,
.links a {
  display: inline-block;
  padding: 8px 12px;
  background: #15161a;
  color: var(--accent);
  text-decoration: none;
  border-radius: 8px;
  font-size: 14px;
}

.buylinks a:hover,
.links a:hover {
  background: #1c1d21;
}

/* --- Row style for index page --- */
.row {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

/* --- Footer --- */
footer {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--muted);
  font-size: 13px;
}

footer div {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  flex-wrap: wrap;
  gap: 8px;
}

footer img {
  width: 40px;
  height: auto;
}

footer span {
  color: var(--muted);
}



/* --- Responsive --- */
@media (max-width: 720px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .row {
    flex-direction: column;
  }

  .cover {
    width: 100%;
    height: auto;
  }

  header {
    flex-direction: column;
    align-items: flex-start;
  }

  nav {
    margin-left: 0;
    margin-top: 12px;
  }

  footer div {
    justify-content: center;
  }
}