/* ==========================================================================
   Orchestration and Command in the Age of AI — stylesheet
   Palette: midnight navy, restrained gold, warm white, soft mist-blue
   ========================================================================== */

:root {
  --color-bg: #080d18;
  --color-bg-alt: #0c1526;
  --color-panel: #0f1a2e;
  --color-line: rgba(201, 162, 75, 0.28);
  --color-line-soft: rgba(183, 194, 214, 0.14);
  --color-gold: #c9a24b;
  --color-gold-bright: #e3bd6f;
  --color-white: #f4f1e9;
  --color-body: #c3cbdb;
  --color-body-dim: #97a3ba;

  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --max-width: 1160px;
  --radius: 4px;
  --dur: 0.5s;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-body);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--color-gold-bright); }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0; padding: 0; margin: -1px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -60px;
  background: var(--color-gold);
  color: #12100a;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-weight: 600;
  z-index: 200;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 1rem;
}

:focus-visible {
  outline: 2px solid var(--color-gold-bright);
  outline-offset: 3px;
}

/* ---------------------------------- Header ---------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 13, 24, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-line-soft);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--color-white);
  font-family: var(--font-display);
  letter-spacing: 0.03em;
  font-size: 1rem;
}

.brand-mark {
  color: var(--color-gold);
  font-size: 0.7rem;
}

.site-nav {
  display: flex;
  gap: clamp(1rem, 2vw, 1.9rem);
}

.site-nav a {
  text-decoration: none;
  color: var(--color-body);
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  padding: 0.3rem 0.1rem;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--color-gold-bright);
  border-bottom-color: var(--color-gold);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  width: 42px;
  height: 38px;
  position: relative;
  cursor: pointer;
}

.nav-toggle-bar,
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 10px; right: 10px;
  height: 2px;
  background: var(--color-white);
}
.nav-toggle-bar { top: 18px; }
.nav-toggle-bar::before { top: -7px; }
.nav-toggle-bar::after { top: 7px; }

/* ---------------------------------- Hero ---------------------------------- */

.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 75% 15%, rgba(201, 162, 75, 0.10), transparent 55%),
    radial-gradient(ellipse at 15% 85%, rgba(60, 90, 140, 0.14), transparent 55%),
    var(--color-bg);
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 5rem) 1.5rem clamp(3rem, 7vw, 6rem);
  display: grid;
  grid-template-columns: minmax(0, 380px) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}

.hero-cover {
  justify-self: center;
  width: 100%;
  max-width: 340px;
  border: 1px solid var(--color-line);
  box-shadow: 0 30px 70px -25px rgba(0,0,0,0.7);
}

.cover-image { width: 100%; }

.eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-gold);
  border: 1px solid var(--color-line);
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  margin: 0 0 1.3rem;
}

.hero h1 {
  font-family: var(--font-display);
  color: var(--color-white);
  font-weight: 400;
  font-size: clamp(2rem, 4.4vw, 3rem);
  line-height: 1.14;
  letter-spacing: 0.01em;
  margin: 0 0 0.3rem;
}

.hero-subtitle {
  display: block;
  font-size: 0.56em;
  color: var(--color-body);
  font-style: italic;
  margin-top: 0.35rem;
}

.hero-tagline {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--color-gold-bright);
  font-size: 1.15rem;
  margin: 0.9rem 0 0.3rem;
}

.hero-author {
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-body-dim);
  margin: 0 0 1.6rem;
}

.hero-intro {
  max-width: 46ch;
  color: var(--color-body);
  font-size: 1.02rem;
  margin: 0 0 2rem;
}

.button {
  display: inline-block;
  text-decoration: none;
  font-family: var(--font-body);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  padding: 0.8rem 1.7rem;
  border-radius: var(--radius);
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.button-primary {
  background: var(--color-gold);
  color: #14110a;
  border: 1px solid var(--color-gold);
  font-weight: 600;
}
.button-primary:hover,
.button-primary:focus-visible {
  background: var(--color-gold-bright);
  border-color: var(--color-gold-bright);
}

/* -------------------------- Signature: the thread -------------------------- */

.section {
  position: relative;
  padding: clamp(3.5rem, 7vw, 6rem) 1.5rem;
  border-top: 1px solid var(--color-line-soft);
}

.section::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -1px;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--color-gold);
  transform: translate(-50%, -50%);
  box-shadow: 0 0 0 4px var(--color-bg), 0 0 10px 1px rgba(201,162,75,0.5);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin: 0 0 0.7rem;
}

.section h2 {
  font-family: var(--font-display);
  font-weight: 400;
  color: var(--color-white);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.25;
  margin: 0 0 1.4rem;
  max-width: 22ch;
}

.lede {
  font-size: 1.12rem;
  color: var(--color-body);
  max-width: 68ch;
  margin: 0 0 2.2rem;
}

.body-text {
  max-width: 68ch;
  margin: 0 0 1.2rem;
  color: var(--color-body);
}

.body-text.emphasis {
  color: var(--color-white);
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-style: italic;
  border-left: 2px solid var(--color-gold);
  padding-left: 1.1rem;
  margin-top: 1.6rem;
}

/* --------------------------------- About --------------------------------- */

.definition-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.4rem;
  margin: 0 0 2.4rem;
}

.definition-card {
  background: var(--color-panel);
  border: 1px solid var(--color-line-soft);
  border-top: 2px solid var(--color-gold);
  padding: 1.7rem 1.7rem 1.5rem;
  border-radius: var(--radius);
}

.definition-card h3 {
  font-family: var(--font-display);
  color: var(--color-gold-bright);
  font-weight: 400;
  font-size: 1.3rem;
  margin: 0 0 0.7rem;
}

.definition-card p {
  margin: 0;
  color: var(--color-body);
}

/* -------------------------------- Message -------------------------------- */

.section-message {
  background: var(--color-bg-alt);
  text-align: center;
}

.message-primary {
  font-family: var(--font-display);
  color: var(--color-white);
  font-weight: 400;
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  line-height: 1.35;
  max-width: 24ch;
  margin: 0 auto;
}

.message-divider {
  width: 64px;
  height: 1px;
  background: var(--color-line);
  margin: 2rem auto;
}

.message-secondary {
  font-size: 1.1rem;
  color: var(--color-body);
  max-width: 46ch;
  margin: 0 auto;
}

/* -------------------------------- Subjects -------------------------------- */

.subjects-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 62ch;
  border-top: 1px solid var(--color-line-soft);
}

.subjects-list li {
  display: flex;
  align-items: baseline;
  gap: 1.3rem;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--color-line-soft);
}

.subject-num {
  font-family: var(--font-display);
  color: var(--color-gold);
  font-size: 1rem;
  min-width: 2.1rem;
}

.subject-text {
  color: var(--color-white);
  font-size: 1.05rem;
}

/* -------------------------------- Audience -------------------------------- */

.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.2rem;
}

.audience-card {
  background: var(--color-panel);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius);
  padding: 1.5rem 1.5rem;
  position: relative;
  padding-left: 1.9rem;
}

.audience-card::before {
  content: "";
  position: absolute;
  left: 1rem;
  top: 1.65rem;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-gold);
}

.audience-text {
  margin: 0;
  color: var(--color-white);
  font-size: 1rem;
}

/* ------------------------------- Back cover ------------------------------- */

.section-backcover { background: var(--color-bg-alt); }

.backcover-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.backcover-image {
  justify-self: center;
  width: 100%;
  max-width: 300px;
  border: 1px solid var(--color-line);
  box-shadow: 0 25px 60px -25px rgba(0,0,0,0.65);
}

.backcover-image img { width: 100%; }

/* -------------------------------- Author -------------------------------- */

.author-inner { max-width: 68ch; }

.text-link {
  display: inline-block;
  margin-top: 0.6rem;
  color: var(--color-gold-bright);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.text-link:hover,
.text-link:focus-visible { color: var(--color-white); }

/* ----------------------------- Publication ----------------------------- */

.amazon-placeholder {
  margin-top: 1.8rem;
  display: inline-flex;
  flex-direction: column;
  gap: 0.3rem;
  border: 1px dashed var(--color-line);
  border-radius: var(--radius);
  padding: 1.1rem 1.5rem;
}

.amazon-placeholder-label {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.amazon-placeholder-text {
  color: var(--color-body-dim);
  font-size: 0.95rem;
}

/* --------------------------------- Footer --------------------------------- */

.site-footer {
  border-top: 1px solid var(--color-line-soft);
  padding: 2.2rem 1.5rem;
  background: var(--color-bg);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  color: var(--color-body-dim);
  font-size: 0.86rem;
}

.footer-inner p { margin: 0; }

/* ---------------------------------- Media ---------------------------------- */

@media (max-width: 860px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-intro { margin-left: auto; margin-right: auto; }
  .hero-subtitle { margin-left: auto; margin-right: auto; }
  .backcover-inner { grid-template-columns: 1fr; }
  .backcover-image { order: -1; max-width: 260px; }
}

@media (max-width: 700px) {
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-line-soft);
    flex-direction: column;
    padding: 0.5rem 1.5rem 1.2rem;
    display: none;
  }
  .site-nav.is-open { display: flex; }
  .nav-toggle { display: block; }
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  .definition-card, .audience-card { padding: 1.3rem; }
  .amazon-placeholder { padding: 1rem 1.2rem; }
}