/* ============================================
   Design Patterns in Modern Perl — site styles
   Palette derived from the book cover.
   ============================================ */

:root {
  --bg: #0d2827;
  --bg-soft: #123534;
  --surface: #1b4b4a;
  --surface-2: #1f5a58;
  --text: #f4f1e6;
  --text-dim: #a9c9c6;
  --text-faint: #6f938f;
  --accent: #d9a73d;
  --accent-soft: #e8c374;
  --rule: rgba(244, 241, 230, 0.12);
  --rule-strong: rgba(244, 241, 230, 0.22);

  --font-display: "Space Grotesk", "Arial Black", sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  --container: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
  display: block;
}

.wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.08;
  margin: 0;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin: 0 0 14px;
  display: flex;
  align-items: center;
  gap: 9px;
}

.eyebrow::before {
  content: "#";
  color: var(--accent);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0;
}

/* -------- Focus states -------- */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* -------- Header -------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(13, 40, 39, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
  color: var(--text);
  line-height: 1;
}

.brand .sigil {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent);
}

.brand .brand-main {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.brand .brand-sub {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--text-faint);
}

@media (max-width: 560px) {
  .brand .brand-sub {
    display: none;
  }
}

nav.primary-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

nav.primary-nav a {
  text-decoration: none;
  font-size: 0.92rem;
  color: var(--text-dim);
  transition: color 0.15s ease;
}

nav.primary-nav a:hover {
  color: var(--accent-soft);
}

.nav-buy {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #17332f;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.88rem;
  transition: transform 0.15s ease, background 0.15s ease;
}

.nav-buy:hover {
  background: var(--accent-soft);
  transform: translateY(-1px);
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--rule-strong);
  border-radius: 6px;
  color: var(--text);
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

/* -------- Hero -------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 84px 0 96px;
  background: var(--bg);
}

.hero-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.16;
  pointer-events: none;
  z-index: 0;
}

.hero .wrap {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 64px;
  align-items: center;
}

.hero-copy .publisher-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
  border: 1px solid var(--rule-strong);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 22px;
}

.hero-copy .publisher-badge b {
  color: var(--accent-soft);
  font-weight: 600;
}

.hero-copy h1 {
  font-size: clamp(2.4rem, 4.6vw, 3.6rem);
  letter-spacing: -0.01em;
}

.hero-copy .subtitle {
  font-family: var(--font-body);
  font-size: 1.2rem;
  color: var(--text-dim);
  font-weight: 400;
  margin: 18px 0 6px;
  max-width: 46ch;
}

.hero-copy .byline {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--text-faint);
  margin: 0 0 34px;
}

.hero-copy .byline a {
  color: var(--text-dim);
  text-decoration: underline;
  text-decoration-color: var(--rule-strong);
  text-underline-offset: 3px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 30px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border-radius: 7px;
  font-weight: 600;
  font-size: 0.96rem;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: #17332f;
}

.btn-primary:hover {
  background: var(--accent-soft);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px -10px rgba(217, 167, 61, 0.55);
}

.btn-ghost {
  background: transparent;
  border-color: var(--rule-strong);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent-soft);
  transform: translateY(-2px);
}

.btn-paperback {
  gap: 10px;
}

.paperback-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(217, 167, 61, 0.14);
  border: 1px solid rgba(217, 167, 61, 0.4);
  padding: 3px 8px;
  border-radius: 4px;
}

.hero-meta {
  display: flex;
  gap: 22px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-faint);
  flex-wrap: wrap;
}

.hero-meta span b {
  color: var(--text-dim);
  font-weight: 600;
}

.hero-cover {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-cover img {
  width: min(320px, 100%);
  border-radius: 6px;
  box-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(244, 241, 230, 0.08);
  transition: transform 0.35s ease;
}

.hero-cover img:hover {
  transform: translateY(-4px);
}

/* -------- Section shell -------- */
section {
  padding: 88px 0;
  border-top: 1px solid var(--rule);
}

.section-head {
  max-width: 640px;
  margin-bottom: 48px;
}

.section-head h2 {
  font-size: clamp(1.7rem, 3vw, 2.3rem);
}

.section-head p {
  color: var(--text-dim);
  margin-top: 14px;
  font-size: 1.04rem;
}

/* -------- About -------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 56px;
  align-items: start;
}

.about-lead p {
  font-size: 1.08rem;
  color: var(--text-dim);
  margin: 0 0 18px;
}

.flavor-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.flavor-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--text);
  padding: 12px 16px;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 6px;
}

.flavor-list li .tag {
  color: var(--accent-soft);
  font-weight: 600;
}

.stat-card {
  background: var(--surface);
  border-radius: 10px;
  padding: 30px;
  border: 1px solid var(--rule);
}

.stat-card .stat {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
}

.stat-card .stat:last-child {
  border-bottom: none;
}

.stat-card .stat .num {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--accent-soft);
}

.stat-card .stat .label {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-dim);
  text-align: right;
}

/* -------- Table of contents (code-block styling) -------- */
.toc-section {
  background: var(--bg-soft);
}

.toc-intro {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: var(--text-faint);
  margin-bottom: 30px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 16px 20px;
  background: var(--bg);
}

.package-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  align-items: start;
}

.package-block {
  background: #0f2f2e;
  border: 1px solid var(--rule-strong);
  border-radius: 10px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.86rem;
}

.package-block .pkg-head {
  padding: 16px 18px;
  border-bottom: 1px solid var(--rule);
  background: var(--surface);
  color: var(--accent-soft);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.package-block .pkg-head .pkg-count {
  color: var(--text-faint);
  font-weight: 400;
  font-size: 0.78rem;
}

.package-block ol {
  list-style: none;
  margin: 0;
  padding: 10px 0;
}

.package-block li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 18px;
  color: var(--text-dim);
}

.package-block li:hover {
  background: rgba(244, 241, 230, 0.04);
  color: var(--text);
}

.package-block li .n {
  color: var(--text-faint);
  min-width: 20px;
}

.package-block li .p {
  margin-left: auto;
  color: var(--text-faint);
}

.front-matter {
  margin-top: 34px;
}

.front-matter summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: var(--text-dim);
  padding: 14px 18px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 8px;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.front-matter summary::-webkit-details-marker {
  display: none;
}

.front-matter summary::after {
  content: "+";
  color: var(--accent);
  font-size: 1.1rem;
}

.front-matter[open] summary::after {
  content: "\2212";
}

.front-matter .fm-body {
  border: 1px solid var(--rule);
  border-top: none;
  border-radius: 0 0 8px 8px;
  padding: 18px 22px;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--text-faint);
  background: var(--bg);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px 30px;
}

.front-matter .fm-body div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 4px 0;
  border-bottom: 1px dashed var(--rule);
}

/* -------- Reviews -------- */
.review-card {
  background: var(--surface);
  border-radius: 10px;
  padding: 34px;
  max-width: 620px;
  border: 1px solid var(--rule);
}

.review-card .stars {
  color: var(--accent);
  letter-spacing: 2px;
  margin-bottom: 14px;
  font-size: 1.05rem;
}

.review-card blockquote {
  margin: 0 0 20px;
  font-size: 1.15rem;
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.4;
}

.review-card cite {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-faint);
}

/* -------- Author -------- */
.author-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 44px;
  align-items: start;
}

.author-photo img {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--rule-strong);
}

.author-bio p {
  color: var(--text-dim);
  font-size: 1.02rem;
  margin: 0 0 16px;
}

.author-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.author-links a {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  text-decoration: none;
  color: var(--text-dim);
  border: 1px solid var(--rule-strong);
  padding: 8px 14px;
  border-radius: 999px;
  transition: all 0.15s ease;
}

.author-links a:hover {
  color: var(--accent-soft);
  border-color: var(--accent);
}

/* -------- Final CTA -------- */
.final-cta {
  text-align: center;
  background: var(--surface);
}

.final-cta h2 {
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  max-width: 640px;
  margin: 0 auto 16px;
}

.final-cta p {
  color: var(--text-dim);
  max-width: 520px;
  margin: 0 auto 34px;
}

.final-cta .cta-row {
  justify-content: center;
}

/* -------- Footer -------- */
footer.site-footer {
  border-top: 1px solid var(--rule);
  padding: 40px 0;
}

footer.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-faint);
}

footer.site-footer a {
  color: var(--text-faint);
  text-decoration: none;
}

footer.site-footer a:hover {
  color: var(--accent-soft);
}

/* -------- Responsive -------- */
@media (max-width: 880px) {
  .hero .wrap {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-cover {
    order: -1;
  }
  .hero-cover img {
    width: min(240px, 60%);
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .package-grid {
    grid-template-columns: 1fr;
  }
  .author-grid {
    grid-template-columns: 120px 1fr;
  }
  .front-matter .fm-body {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  nav.primary-nav {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--rule);
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 24px;
    gap: 16px;
    display: none;
  }
  nav.primary-nav.open {
    display: flex;
  }
  .menu-toggle {
    display: inline-flex;
  }
  .author-grid {
    grid-template-columns: 1fr;
  }
  .author-photo {
    width: 120px;
  }
}