:root {
  --bg: #0f1117;
  --text: #f2f2f2;
  --muted: #b8b8b8;
  --accent: #b8c7ff;
  --line: rgba(255, 255, 255, 0.18);
  --panel: rgba(255, 255, 255, 0.04);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* LINKS */

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

/* HEADER */

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(15, 17, 23, 0.92);
}

.nav {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}

.logo {
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
}

.logo:hover {
  color: var(--accent);
  text-decoration: none;
}

.menu {
  display: flex;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.menu a {
  color: var(--muted);
  font-size: 0.95rem;
}

.menu a:hover,
.menu a.active {
  color: var(--accent);
  text-decoration: none;
}

/* LAYOUT */

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 72px 24px 80px;
}

/* TYPOGRAPHY */

h1 {
  font-size: clamp(2.4rem, 7vw, 3.4rem);
  line-height: 1.1;
  margin: 0 0 0.25em;
  letter-spacing: 0.04em;
}

h2 {
  font-size: 1.4rem;
  font-weight: normal;
  color: var(--accent);
  margin-top: 0;
  margin-bottom: 2em;
}

h3 {
  color: var(--accent);
  font-size: 1.25rem;
}

p {
  font-size: 1.1rem;
  margin: 0 0 1.4em;
}

/* SECTIONS */

.section-card {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.panel {
  margin-top: 36px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
}

/* BUTTONS */

.button,
.pill {
  display: inline-block;
  margin-top: 12px;
  padding: 10px 16px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
}

.button:hover,
.button:focus {
  background: var(--accent);
  color: var(--bg);
  text-decoration: none;
}

/* SPARK COVER */

.book-cover {
  text-align: center;
  margin: 40px 0;
}

.book-cover img {
  width: 100%;
  max-width: 320px;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.35);
}

/* HOME AUTHOR PHOTO */

.home-author {
  text-align: center;
  margin: 40px 0;
}

.home-author img {
  width: 180px;
  height: 180px;
  object-fit: cover;
  border-radius: 50%;
  display: block;
  margin: 0 auto;
}

/* ABOUT PHOTO */

.author-photo {
  text-align: center;
  margin: 40px 0;
}

.author-photo img {
  width: 100%;
  max-width: 420px;
  height: auto;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.35);
}

/* FOOTER */

footer {
  margin-top: 72px;
  font-size: 0.9rem;
  color: #9a9a9a;
}

footer p {
  font-size: 0.9rem;
}

/* MOBILE */

@media (max-width: 620px) {

  .nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .menu {
    flex-wrap: wrap;
    gap: 14px 18px;
  }

  .container {
    padding-top: 56px;
  }

  .home-author img {
    width: 140px;
    height: 140px;
  }

}