/*
 * Visual identity matches the real book covers (assets/img/book1-cover.jpg,
 * book2-cover.jpg, book3-cover.jpg): a white field, bold black display type,
 * and one saturated identity color per book, plus the publisher's red used
 * site-wide. All text/background pairs below meet WCAG AA contrast (4.5:1+)
 * unless commented otherwise (a few accent colors are decorative/large-text
 * only — see notes).
 */
:root {
  --color-bg: #ffffff; /* page background, matches the covers' white field */
  --color-bg-card: #f5f4f1; /* subtle card background */
  --color-text: #171717; /* near-black, matches the covers' bold calligraphy */
  --color-primary: #c4001a; /* publisher red (sampled from the cover logo) */
  --color-primary-dark: #8f0013; /* hover state */
  --color-border: #e4e1da;

  /* One identity color per book, sampled directly from each cover. */
  --color-book1: #c93c04; /* Part I — orange */
  --color-book2: #8c7952; /* Part II — gold/bronze */
  --color-book3: #4b4b46; /* Part III — charcoal */
  --color-archive: #6b6862; /* Prior Books page — neutral gray, no cover art. Darkened from the original #9a978f swatch so it also passes 3:1 contrast when used as heading text, not just as a decorative border. */

  --font-heading: "Cairo", "Tahoma", "Arial", sans-serif;
  --font-body: "Cairo", "Tahoma", "Arial", sans-serif;
  --max-width: 60rem;
}

/* Per-page accent — set via a class on <body> (e.g. "theme-book1") so each
   book page picks up its own cover color for headings/borders. Defaults to
   the site's primary red when no theme class is present. */
body {
  --color-accent: var(--color-primary);
}
body.theme-book1 {
  --color-accent: var(--color-book1);
}
body.theme-book2 {
  --color-accent: var(--color-book2);
}
body.theme-book3 {
  --color-accent: var(--color-book3);
}
body.theme-archive {
  --color-accent: var(--color-archive);
}

* {
  box-sizing: border-box;
}

html {
  font-size: 100%;
}

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.7;
}

h1,
h2,
h3 {
  font-family: var(--font-heading);
  font-weight: 800;
}

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

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

a:hover,
a:focus {
  color: var(--color-primary-dark);
}

/* Visible, high-contrast focus ring for keyboard users, on any background */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-primary-dark);
  outline-offset: 3px;
  box-shadow: 0 0 0 5px var(--color-bg);
}

@media (prefers-reduced-motion: no-preference) {
  a,
  button {
    transition: background-color 0.15s ease, color 0.15s ease;
  }
}

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

.skip-link {
  position: absolute;
  inset-inline-start: 0.5rem;
  top: -3rem;
  z-index: 100;
  background: var(--color-primary);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: 0 0 0.4rem 0.4rem;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 0;
}

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

.site-header {
  background-color: var(--color-primary);
  color: #fff;
  padding-block: 1rem;
  border-block-end: 4px solid var(--color-accent);
}

.site-header a {
  color: #fff;
}

.site-header__inner {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.4rem;
}

.site-title a {
  text-decoration: none;
}

.site-tagline {
  margin: 0.15rem 0 0;
  font-size: 0.9rem;
  color: #f7d9de;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.button {
  display: inline-block;
  font: inherit;
  font-weight: bold;
  text-decoration: none;
  border-radius: 0.35rem;
  padding: 0.6rem 1.1rem;
  border: 2px solid transparent;
  cursor: pointer;
}

.button--ghost {
  background: transparent;
  color: #fff;
  border-color: #fff;
}

.button--ghost:hover,
.button--ghost:focus-visible {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
}

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

.button--primary:hover,
.button--primary:focus-visible {
  background: var(--color-primary-dark);
  color: #fff;
}

/* Higher specificity than ".site-header a" so the button keeps its own
   colors instead of inheriting the header's default white link color. */
.site-header .button--home {
  background: #fff;
  color: var(--color-primary);
}

.site-header .button--home:hover,
.site-header .button--home:focus-visible {
  background: #f3d9dd;
  color: var(--color-primary-dark);
}

/* ---------- Layout ---------- */

main {
  max-width: var(--max-width);
  margin-inline: auto;
  padding: 2rem 1.25rem 3rem;
}

.site-footer {
  background-color: var(--color-bg-card);
  border-block-start: 1px solid var(--color-border);
  text-align: center;
  padding: 1.5rem 1.25rem;
  font-size: 0.9rem;
}

/* ---------- Home page ---------- */

.hero {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 2rem;
  margin-block-end: 3rem;
}

.hero__image {
  flex: 1 1 14rem;
  max-width: 18rem;
}

.hero__image img {
  border-radius: 0.5rem;
  border: 4px solid var(--color-bg-card);
}

.hero__text {
  flex: 2 1 20rem;
}

.hero__text h1 {
  margin-block-start: 0;
  color: var(--color-primary);
}

.books-heading {
  color: var(--color-text);
  border-block-end: 2px solid var(--color-border);
  padding-block-end: 0.5rem;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 1.5rem;
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
}

.book-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-block-start: 5px solid var(--card-accent, var(--color-primary));
  border-radius: 0.35rem;
  padding: 1.25rem;
}

.book-card--1 {
  --card-accent: var(--color-book1);
}
.book-card--2 {
  --card-accent: var(--color-book2);
}
.book-card--3 {
  --card-accent: var(--color-book3);
}
.book-card--archive {
  --card-accent: var(--color-archive);
}

.book-card__link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.book-card__link:hover .book-card__title,
.book-card__link:focus-visible .book-card__title {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

.book-card__title {
  margin: 0 0 0.5rem;
  color: var(--color-text);
  font-size: 1.1rem;
}

.book-card__teaser {
  margin: 0;
  font-size: 0.95rem;
}

/* ---------- Book page ---------- */

.book-page {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
}

.book-page__cover {
  flex: 1 1 14rem;
  max-width: 16rem;
}

.book-page__cover img {
  border-radius: 0.35rem;
  border: 4px solid var(--color-accent);
}

.book-page__details {
  flex: 2 1 20rem;
}

.book-page__details h1 {
  margin-block-start: 0;
  margin-block-end: 0.25rem;
  color: var(--color-accent);
}

.book-page__subtitle {
  margin-block-start: 0;
  margin-block-end: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

.purchase-area {
  margin-block-start: 1.5rem;
}

.purchase-heading {
  margin: 0 0 0.75rem;
  font-weight: 600;
}

.purchase-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- Prior Books page (no cover art, text-only) ---------- */

.prose h1 {
  margin-block-start: 0;
  color: var(--color-accent);
}

.prose p {
  max-width: 42rem;
}
