:root {
  color-scheme: light;
  font-family: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif SC", serif;
  color: #302d28;
  background: #eee9de;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background-color: #eee9de;
  background-image: repeating-radial-gradient(ellipse at 70% 20%, transparent 0 18px, rgb(104 98 85 / 5%) 19px 20px);
}
a { color: #765044; }
.site-header {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
  padding: 24px 0 18px;
  border-bottom: 1px solid #aaa394;
}
.site-header__brand { color: #403c35; font-size: 13px; font-weight: 700; letter-spacing: .28em; text-decoration: none; }
.site-header__brand::before { content: "庭"; display: inline-grid; width: 28px; height: 28px; margin-right: 10px; place-items: center; color: #f7f2e8; background: #98483b; font-size: 14px; letter-spacing: 0; }
.site-header__nav { display: flex; gap: 26px; }
.site-header__nav a { color: #5c574e; font-size: 14px; text-decoration: none; }
.site-header__nav a:hover { color: #98483b; }
.game-hub { width: min(1080px, calc(100% - 40px)); margin: 0 auto; padding: 0 0 70px; }
.game-hub__header {
  position: relative;
  width: 100vw;
  min-height: 520px;
  margin: 0 0 64px calc(50% - 50vw);
  padding: 120px max(24px, calc((100vw - 1080px) / 2));
  overflow: hidden;
  background: #eee9de url("/assets/karesansui.webp") center / cover no-repeat;
}
.game-hub__header::after { content: ""; position: absolute; inset: auto 0 0; height: 130px; background: linear-gradient(transparent, #eee9de); }
.game-hub__header > * { position: relative; z-index: 1; max-width: 720px; }
.game-hub__eyebrow { margin: 0 0 18px; color: #98483b; font-size: 13px; font-weight: 700; letter-spacing: .3em; }
.game-hub__title { margin: 0; color: #282722; font-size: clamp(38px, 6vw, 72px); font-weight: 500; line-height: 1.18; letter-spacing: .08em; }
.game-hub__lead { margin: 26px 0 0; color: #555148; font-size: clamp(16px, 2vw, 19px); line-height: 2; }
.section-title { display: flex; align-items: center; gap: 16px; margin: 0 0 28px; color: #35322c; font-size: clamp(25px, 4vw, 36px); font-weight: 500; letter-spacing: .1em; }
.section-title::after { content: ""; flex: 1; height: 1px; background: #aaa394; }
.game-hub__grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid #918b7f; border-left: 1px solid #918b7f; }
.game-hub__card {
  position: relative;
  min-height: 255px;
  padding: 36px 38px;
  background: rgb(248 244 235 / 68%);
  border-right: 1px solid #918b7f;
  border-bottom: 1px solid #918b7f;
  transition: background-color 180ms ease;
}
.game-hub__card:hover { background: #f8f4eb; }
.game-hub__card::after { content: ""; position: absolute; right: 24px; bottom: 24px; width: 54px; height: 38px; border: 1px solid #aaa394; border-radius: 50%; opacity: .5; transform: rotate(-9deg); }
.game-hub__card--main::after { transform: rotate(7deg); }
.game-hub__card--special::after { width: 34px; border-radius: 2px; transform: rotate(-4deg); }
.game-hub__number { color: #98483b; font: 700 12px/1 ui-monospace, monospace; letter-spacing: .2em; }
.game-hub__card h3 { margin: 26px 0 12px; color: #2f2c27; font-size: clamp(23px, 3vw, 31px); font-weight: 500; letter-spacing: .08em; }
.game-hub__card p { max-width: 390px; min-height: 55px; margin: 0 0 24px; color: #686258; line-height: 1.8; }
.game-hub__card a { color: #854c3f; font-weight: 700; text-decoration: none; }
.content-section { margin-top: 70px; padding: 42px 48px; border-left: 4px solid #777267; background: rgb(248 244 235 / 62%); }
.content-section p, .content-section li { color: #5e594f; font-size: 16px; line-height: 2; }
.guide-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 30px; }
.guide-card { padding: 26px; border: 1px solid #aaa394; background: rgb(248 244 235 / 55%); text-decoration: none; }
.guide-card::before { content: "◇"; display: block; margin-bottom: 18px; color: #98483b; }
.guide-card strong, .guide-card span { display: block; }
.guide-card strong { color: #3e3a33; font-size: 17px; font-weight: 600; }
.guide-card span { margin-top: 9px; color: #777065; font-size: 14px; line-height: 1.7; }
.steps { padding-left: 22px; }
.game-hub__notice { margin: 34px 0 0; color: #857f73; font-size: 13px; text-align: center; }
.article { width: min(800px, calc(100% - 40px)); margin: 0 auto; padding: 70px 0 90px; }
.article::before { content: ""; display: block; width: 100%; height: 210px; margin-bottom: 42px; background: url("/assets/karesansui.webp") 70% 72% / cover no-repeat; border-bottom: 3px solid #777267; filter: saturate(.65); }
.article__breadcrumb { margin-bottom: 38px; color: #7a7469; font-size: 14px; }
.article__breadcrumb a { color: #685f55; }
.article__eyebrow { color: #98483b; font-size: 13px; font-weight: 700; letter-spacing: .22em; }
.article h1 { margin: 12px 0 28px; color: #2d2a25; font-size: clamp(34px, 6vw, 56px); font-weight: 500; line-height: 1.25; letter-spacing: .08em; }
.article h2 { display: flex; align-items: center; gap: 12px; margin: 50px 0 16px; color: #3c3831; font-size: 26px; font-weight: 500; }
.article h2::before { content: ""; width: 22px; height: 1px; background: #98483b; }
.article p, .article li { color: #5d584e; font-size: 17px; line-height: 2; }
.article__actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 34px 0; }
.article__button { display: inline-block; padding: 13px 24px; border: 1px solid #3e3a33; background: #3e3a33; color: #f6f1e7; font-weight: 700; text-decoration: none; }
.article__button--secondary { background: transparent; color: #3e3a33; }
.article details { margin: 14px 0; padding: 18px 20px; border: 1px solid #aaa394; background: rgb(248 244 235 / 48%); }
.article summary { cursor: pointer; color: #3d3932; font-weight: 700; }
@media (max-width: 680px) {
  .site-header { align-items: flex-start; gap: 18px; }
  .site-header__nav { flex-wrap: wrap; gap: 8px 14px; }
  .game-hub__header { min-height: 470px; margin-bottom: 44px; padding-top: 82px; background-position: 63% center; }
  .game-hub__header > * { max-width: 72%; }
  .game-hub__grid, .guide-grid { grid-template-columns: 1fr; }
  .game-hub__card { min-height: 0; padding: 30px; }
  .content-section { padding: 28px; }
  .article { padding-top: 30px; }
  .article::before { height: 150px; }
}