:root {
  --paper: #f2efe5;
  --sheet: #fffdf6;
  --ink: #202119;
  --muted: #686b55;
  --line: #d6d0bd;
  --green: #5d6f2f;
  --red: #a84830;
  --max: 1160px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Sans JP", system-ui, sans-serif;
  line-height: 1.85;
  letter-spacing: 0;
}
a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; height: auto; }

.header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 18px clamp(18px, 4vw, 48px);
  background: rgba(242,239,229,.9);
  border-bottom: 2px solid var(--ink);
  backdrop-filter: blur(14px);
}
.brand { font-weight: 700; letter-spacing: .1em; }
nav { display: flex; gap: 24px; font-size: 13px; text-transform: uppercase; }
.nav-button { display: none; border: 2px solid var(--ink); background: transparent; padding: 8px 12px; font: inherit; }

.cover {
  max-width: 1360px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: .86fr 1.14fr;
  gap: clamp(28px, 5vw, 76px);
  padding: clamp(34px, 6vw, 80px) clamp(18px, 4vw, 48px) 0;
  align-items: end;
}
.cover__volume { margin: 0 0 28px; color: var(--red); font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.cover h1 {
  margin: 0;
  font-family: "Noto Serif JP", serif;
  font-size: clamp(48px, 8vw, 116px);
  font-weight: 500;
  line-height: 1.04;
}
.cover__lead { max-width: 520px; margin: 32px 0 0; color: var(--muted); font-size: 16px; }
.cover__image { margin: 0; border: 2px solid var(--ink); background: var(--sheet); padding: 12px; transform: rotate(.8deg); }
.cover__image img { aspect-ratio: 4 / 3; object-fit: cover; }
figcaption { margin-top: 8px; color: var(--muted); font-size: 12px; }

.index-strip {
  max-width: var(--max);
  margin: 72px auto 0;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 2px solid var(--ink);
  border-left: 2px solid var(--ink);
}
.index-strip a { min-height: 92px; padding: 18px; border-right: 2px solid var(--ink); border-bottom: 2px solid var(--ink); background: var(--sheet); font-weight: 600; }
.index-strip span { display: block; color: var(--red); font-size: 12px; margin-bottom: 8px; }

.essay, .photo-note, .rooms, .guide, .booking, .access {
  max-width: var(--max);
  margin: 0 auto;
  padding: 108px 24px 0;
}
.kicker, .section-title p { margin: 0 0 14px; color: var(--red); font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.essay h2, .section-title h2, .booking h2, .access h2 {
  margin: 0;
  font-family: "Noto Serif JP", serif;
  font-size: clamp(30px, 4.6vw, 60px);
  font-weight: 500;
  line-height: 1.25;
}
.essay__body { display: grid; grid-template-columns: repeat(2, 1fr); gap: 42px; margin-top: 36px; border-top: 2px solid var(--ink); padding-top: 32px; color: var(--muted); }
.essay__body p { margin: 0; }

.photo-note { display: grid; grid-template-columns: 1.3fr .7fr; gap: 28px; align-items: stretch; }
.photo-note figure, .photo-note aside { margin: 0; border: 2px solid var(--ink); background: var(--sheet); padding: 14px; }
.photo-note img { aspect-ratio: 16 / 10; object-fit: cover; }
.photo-note aside { display: flex; flex-direction: column; justify-content: center; padding: 32px; }
.photo-note h2 { margin: 0 0 18px; font-size: 20px; }
.photo-note ul { padding-left: 20px; margin: 0; color: var(--muted); }

.section-title { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 34px; border-bottom: 2px solid var(--ink); padding-bottom: 22px; }
.room {
  display: grid;
  grid-template-columns: 86px minmax(220px, 360px) 1fr;
  gap: 24px;
  align-items: center;
  padding: 28px 0;
  border-bottom: 2px solid var(--ink);
}
.room__no { color: var(--red); font-size: 34px; font-weight: 700; }
.room img { aspect-ratio: 4 / 3; object-fit: cover; border: 2px solid var(--ink); }
.room h3 { margin: 0 0 10px; font-family: "Noto Serif JP", serif; font-size: 34px; font-weight: 500; }
.room p { margin: 0 0 16px; color: var(--muted); }
.room dl { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; margin: 0; font-size: 13px; }
.room dt { color: var(--green); font-weight: 700; }
.room dd { margin: 0; }

.guide-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 2px solid var(--ink); border-left: 2px solid var(--ink); }
.guide-grid article { min-height: 260px; padding: 22px; border-right: 2px solid var(--ink); border-bottom: 2px solid var(--ink); background: var(--sheet); }
.guide-grid span { color: var(--red); font-weight: 700; font-size: 12px; text-transform: uppercase; }
.guide-grid h3 { margin: 38px 0 12px; font-family: "Noto Serif JP", serif; font-size: 23px; }
.guide-grid p { margin: 0; color: var(--muted); font-size: 14px; }

.booking { display: grid; grid-template-columns: 280px 1fr; gap: 42px; align-items: start; }
table { width: 100%; border-collapse: collapse; background: var(--sheet); border: 2px solid var(--ink); }
th, td { padding: 18px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--green); font-size: 12px; text-transform: uppercase; }
.booking__note { grid-column: 2; margin: 0; color: var(--muted); font-size: 13px; }

.access { display: grid; grid-template-columns: .8fr 1.2fr; gap: 28px; padding-bottom: 72px; }
.access__text { border: 2px solid var(--ink); background: var(--sheet); padding: 28px; }
.access iframe { width: 100%; min-height: 340px; border: 2px solid var(--ink); }
.footer { max-width: var(--max); margin: 0 auto; padding: 0 24px 56px; display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); }

@media (max-width: 900px) {
  .header { grid-template-columns: 1fr auto; }
  nav { position: fixed; inset: 68px 16px auto; display: none; flex-direction: column; padding: 18px; background: var(--sheet); border: 2px solid var(--ink); }
  nav.is-open { display: flex; }
  .nav-button { display: block; }
  .cover, .essay__body, .photo-note, .booking, .access { grid-template-columns: 1fr; }
  .cover__image { transform: none; }
  .index-strip, .guide-grid { grid-template-columns: 1fr 1fr; }
  .room { grid-template-columns: 1fr; gap: 14px; }
  .booking__note { grid-column: auto; }
}
@media (max-width: 560px) {
  .index-strip, .guide-grid { grid-template-columns: 1fr; }
}