:root {
  color-scheme: light;
  --paper: #fbfaf7;
  --surface: #ffffff;
  --ink: #1f2524;
  --muted: #65706e;
  --line: #d9ded8;
  --green: #275f4a;
  --red: #9f3f36;
  --blue: #315c91;
  --gold: #a87628;
  --shadow: 0 18px 48px rgba(31, 37, 36, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px clamp(18px, 4vw, 56px);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.82);
  position: sticky;
  top: 0;
  z-index: 5;
  backdrop-filter: blur(14px);
}

.banner-link img {
  display: block;
  width: min(320px, 48vw);
  height: auto;
  border-radius: 6px;
}

.top-nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.top-nav a,
.book-actions a,
.reader-actions a,
.reader-actions button,
.back-link,
.filter-button {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  padding: 9px 12px;
  text-decoration: none;
  font: inherit;
  cursor: pointer;
}

.top-nav a:hover,
.book-actions a:hover,
.reader-actions a:hover,
.reader-actions button:hover,
.back-link:hover,
.filter-button:hover,
.filter-button.active {
  border-color: var(--green);
  color: var(--green);
}

main {
  width: min(1240px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.6fr);
  gap: clamp(20px, 4vw, 48px);
  padding: clamp(42px, 8vw, 92px) 0 34px;
  align-items: end;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--red);
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(3rem, 9vw, 7.2rem);
  line-height: 0.92;
  font-weight: 760;
}

.hero-copy {
  width: min(760px, 100%);
  margin: 22px 0 0;
  color: var(--muted);
  font-size: clamp(1.03rem, 2vw, 1.32rem);
}

.stats {
  display: grid;
  gap: 10px;
}

.stats div {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 6px solid var(--green);
  border-radius: 8px;
  padding: 16px;
  box-shadow: var(--shadow);
}

.stats strong {
  display: block;
  font-size: 2rem;
  line-height: 1;
}

.stats span {
  color: var(--muted);
}

.controls {
  display: grid;
  gap: 14px;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.search-label {
  font-weight: 700;
}

#search {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  font: inherit;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.catalog-section {
  padding: 34px 0 64px;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: end;
  margin-bottom: 18px;
}

h2 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 3rem);
}

.section-heading p {
  margin: 0;
  color: var(--muted);
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
}

.book-card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 12px 30px rgba(31, 37, 36, 0.08);
}

.book-card img {
  width: 100%;
  aspect-ratio: 7 / 9;
  object-fit: cover;
  background: #eef1ed;
  border-bottom: 1px solid var(--line);
}

.book-card-body {
  display: grid;
  gap: 10px;
  padding: 14px;
  flex: 1;
}

.book-card h3 {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.32;
  overflow-wrap: anywhere;
}

.book-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  color: var(--muted);
  font-size: 0.9rem;
}

.book-meta span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 8px;
}

.book-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: auto;
}

.book-actions a:first-child {
  background: var(--green);
  border-color: var(--green);
  color: white;
}

footer {
  border-top: 1px solid var(--line);
  padding: 24px clamp(18px, 4vw, 56px);
  color: var(--muted);
  background: var(--surface);
}

footer p {
  margin: 0;
}

.reader-body {
  background: #edeff0;
}

.reader-toolbar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.reader-title {
  min-width: 0;
}

.reader-title strong,
.reader-title span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.reader-title span {
  color: var(--muted);
  font-size: 0.9rem;
}

.reader-actions {
  display: flex;
  gap: 8px;
}

.reader-main {
  display: grid;
  justify-items: center;
  width: 100%;
  padding: 18px;
}

#pdf-canvas {
  max-width: 100%;
  height: auto;
  background: white;
  box-shadow: var(--shadow);
}

.reader-error {
  max-width: 720px;
  padding: 18px;
  background: #fff3f1;
  border: 1px solid #e6b8b2;
  border-radius: 8px;
  color: #7d2c25;
}

@media (max-width: 760px) {
  .site-header,
  .section-heading,
  .reader-toolbar {
    align-items: stretch;
    grid-template-columns: 1fr;
    flex-direction: column;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .top-nav,
  .reader-actions {
    justify-content: stretch;
  }

  .top-nav a,
  .reader-actions a,
  .reader-actions button {
    flex: 1;
    text-align: center;
  }
}