:root {
  --ink: #273129;
  --muted: #74776c;
  --paper: #f8f3e7;
  --soft: #fffaf0;
  --line: #ddd3bd;
  --moss: #315c51;
  --leaf: #78906f;
  --blue: #7f9eac;
  --gold: #d4aa61;
  --shadow: rgba(64, 51, 31, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(255, 250, 239, 0.92), rgba(241, 234, 217, 0.94)),
    radial-gradient(circle at 18% 10%, rgba(212, 170, 97, 0.22), transparent 26rem),
    radial-gradient(circle at 86% 40%, rgba(127, 158, 172, 0.18), transparent 32rem);
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, system-ui, sans-serif;
  line-height: 1.75;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid rgba(49, 92, 81, 0.14);
  background: rgba(255, 250, 240, 0.86);
  backdrop-filter: blur(14px);
}

.brand,
.nav {
  display: flex;
  align-items: center;
}

.brand {
  gap: 0.7rem;
  color: var(--moss);
  font-weight: 700;
}

.brand-mark {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border: 1px solid rgba(49, 92, 81, 0.26);
  background: rgba(255, 255, 255, 0.38);
  font-family: Georgia, serif;
}

.nav {
  gap: 0.9rem;
  color: rgba(39, 49, 41, 0.72);
  font-size: 0.92rem;
}

.nav a:hover {
  color: var(--moss);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(20rem, 1fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
  padding: clamp(3rem, 8vw, 7rem) clamp(1rem, 6vw, 5rem) clamp(2.5rem, 6vw, 5rem);
}

.hero-copy {
  max-width: 42rem;
}

.eyebrow {
  margin: 0 0 0.65rem;
  color: var(--leaf);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2 {
  font-family: Georgia, "Yu Mincho", "Hiragino Mincho ProN", serif;
  letter-spacing: 0;
}

h1 {
  margin-bottom: 1rem;
  color: var(--moss);
  font-size: clamp(3.1rem, 8vw, 6.8rem);
  line-height: 1.04;
}

h2 {
  margin-bottom: 0.75rem;
  color: var(--moss);
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1.16;
}

h3 {
  margin-bottom: 0.45rem;
  color: var(--moss);
  font-size: 1.05rem;
  line-height: 1.45;
}

.lead {
  color: rgba(39, 49, 41, 0.74);
  font-size: clamp(1.04rem, 1.8vw, 1.22rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.6rem;
}

.button,
.filter {
  min-height: 2.7rem;
  border: 1px solid rgba(49, 92, 81, 0.24);
  background: rgba(255, 255, 255, 0.46);
  color: var(--moss);
  padding: 0.58rem 1rem;
  cursor: pointer;
}

.button.primary,
.filter.is-active {
  background: var(--moss);
  color: var(--soft);
}

.button:hover,
.button:focus-visible,
.filter:hover,
.filter:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.hero-shelf {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(0.6rem, 2vw, 1.1rem);
  align-items: end;
  padding: clamp(1rem, 2vw, 1.4rem);
  border: 1px solid rgba(49, 92, 81, 0.14);
  background: rgba(255, 250, 239, 0.58);
  box-shadow: 0 22px 60px var(--shadow);
}

.hero-shelf img,
.book-cover-link img,
.side-cover-link img {
  display: block;
  width: 100%;
  height: auto;
  box-shadow: 0 16px 32px rgba(51, 45, 33, 0.16);
}

.hero-shelf img:nth-child(2) {
  transform: translateY(-1.1rem);
}

.status-band {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: 1px;
  margin: 0 clamp(1rem, 6vw, 5rem) clamp(3rem, 6vw, 5rem);
  border: 1px solid var(--line);
  background: var(--line);
}

.status-link {
  display: block;
  padding: 1.2rem;
  background: rgba(255, 250, 239, 0.78);
  color: inherit;
  transition: background 160ms ease, transform 160ms ease;
}

.status-link:hover,
.status-link:focus-visible {
  position: relative;
  z-index: 1;
  background: rgba(255, 255, 255, 0.94);
  outline: 2px solid var(--gold);
  outline-offset: -2px;
}

.status-link small {
  display: inline-block;
  margin-top: 0.65rem;
  color: var(--moss);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.status-band span,
.book-number,
.side-type {
  color: var(--leaf);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.status-band strong {
  display: block;
  margin: 0.1rem 0 0.35rem;
  color: var(--moss);
  font-family: Georgia, serif;
  font-size: 2rem;
  line-height: 1.1;
}

.status-band p,
.section-heading p,
.book-card p,
.side-card p,
.about-section p {
  color: rgba(39, 49, 41, 0.7);
}

.guide-section,
.books-section,
.bunko-section,
.side-section,
.about-section {
  padding: clamp(3rem, 7vw, 6rem) clamp(1rem, 6vw, 5rem);
}

#guide,
#main-books,
#bunko-books,
#side-books,
#about {
  scroll-margin-top: 6.5rem;
}

.section-heading {
  max-width: 56rem;
  margin-bottom: 1.6rem;
}

.section-heading.split {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  max-width: none;
}

.section-heading.split p {
  max-width: 30rem;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 1rem;
}

.note-journey {
  margin-top: 2rem;
  padding: clamp(1.2rem, 3vw, 2rem);
  border: 1px solid var(--line);
  background: rgba(255, 250, 239, 0.62);
}

.note-journey-heading h3 {
  margin-bottom: 0.35rem;
  font-family: Georgia, "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(1.3rem, 2.4vw, 1.8rem);
}

.note-journey-heading p:last-child {
  max-width: 42rem;
  margin-bottom: 1.2rem;
}

.note-journey-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.7rem;
}

.note-journey-link {
  display: grid;
  gap: 0.28rem;
  min-height: 8rem;
  padding: 0.9rem;
  border: 1px solid rgba(49, 92, 81, 0.18);
  background: rgba(255, 255, 255, 0.42);
}

.note-journey-link:hover,
.note-journey-link:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
  background: rgba(255, 255, 255, 0.9);
}

.note-journey-link span {
  color: var(--leaf);
  font-family: Georgia, serif;
  font-size: 1.3rem;
}

.note-journey-link strong {
  color: var(--moss);
  line-height: 1.45;
}

.note-journey-link small {
  color: rgba(39, 49, 41, 0.68);
  line-height: 1.55;
}

@media (max-width: 760px) {
  .note-journey-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 460px) {
  .note-journey-grid {
    grid-template-columns: 1fr;
  }
}

.guide-link {
  display: block;
  min-height: 14rem;
  padding: 1.2rem;
  border: 1px solid rgba(49, 92, 81, 0.14);
  background: rgba(255, 250, 239, 0.58);
  color: inherit;
  transition: background 160ms ease, transform 160ms ease;
}

.guide-link:hover,
.guide-link:focus-visible {
  background: rgba(255, 255, 255, 0.94);
  outline: 2px solid var(--gold);
  outline-offset: -2px;
  transform: translateY(-2px);
}

.guide-link small {
  display: inline-block;
  margin-top: 0.8rem;
  color: var(--moss);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.guide-grid span {
  display: block;
  margin-bottom: 1.2rem;
  color: var(--gold);
  font-family: Georgia, serif;
  font-size: 2rem;
  line-height: 1;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: 1.4rem;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(11rem, 1fr));
  gap: 1.1rem;
}

.book-card,
.bunko-card,
.side-card {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  min-width: 0;
}

.book-card-body,
.bunko-card > div,
.side-card > div {
  display: grid;
  gap: 0.25rem;
}

.book-card h3,
.bunko-card h3,
.side-card h3 {
  color: var(--ink);
  font-weight: 800;
  line-height: 1.45;
}

.book-card-body p,
.bunko-card p,
.side-card p {
  color: rgba(39, 49, 41, 0.64);
  font-size: 0.9rem;
  line-height: 1.65;
}

.book-meta {
  margin: 0;
  color: var(--leaf);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.text-link {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 2.2rem;
  margin-top: 0.3rem;
  border-bottom: 1px solid rgba(49, 92, 81, 0.42);
  color: var(--moss);
  font-size: 0.9rem;
  font-weight: 700;
}

.book-group-label {
  grid-column: 1 / -1;
  margin: 1.5rem 0 0.2rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  color: var(--moss);
  font-weight: 800;
}

.bunko-grid,
.side-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 1.2rem;
}

.bunko-section {
  border-block: 1px solid rgba(127, 158, 172, 0.22);
  background: rgba(241, 246, 247, 0.48);
}

.about-section {
  display: grid;
  grid-template-columns: minmax(14rem, 0.75fr) minmax(0, 1fr);
  gap: clamp(1.4rem, 5vw, 4rem);
  border-top: 1px solid var(--line);
}

.about-section .note {
  padding: 1rem;
  border-left: 3px solid var(--gold);
  background: rgba(255, 250, 239, 0.6);
}

.footer {
  padding: 2rem clamp(1rem, 6vw, 5rem);
  border-top: 1px solid var(--line);
  color: rgba(39, 49, 41, 0.6);
}

.footer p {
  margin: 0;
}

@media (max-width: 900px) {
  .site-header,
  .section-heading.split {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav {
    flex-wrap: wrap;
  }

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

  .status-band,
  .guide-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .status-band,
  .guide-grid {
    grid-template-columns: 1fr;
  }

  .hero-shelf {
    grid-template-columns: repeat(3, 34vw);
    margin-inline: -1rem;
    overflow: hidden;
  }

  .book-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}