@charset "UTF-8";
:root {
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background-color: #070708;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: radial-gradient(60% 40% at 50% 0%, rgba(200, 169, 106, 0.12), transparent 70%), #070708;
  color: #ece4d2;
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic UI", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.02em;
}

a {
  color: #f0d896;
  text-underline-offset: 3px;
}

p {
  margin: 0 0 10px;
}

.g_wrap {
  width: min(100%, 1180px);
  margin: 0 auto;
  padding: 24px 16px 64px;
}

.g_back {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: #f0d896;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.g_hero {
  padding: 24px 0 8px;
}

.g_brand {
  margin: 12px 0 0;
  color: #c8a96a;
  font-size: 13px;
  letter-spacing: 0.5em;
}

.g_eyebrow {
  margin: 22px 0 0;
  color: #c8a96a;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.4em;
}

.g_title {
  margin: 6px 0 16px;
  background: linear-gradient(100deg, #8a6a2f 0%, #e9cf8c 22%, #fff1c9 38%, #b8904a 58%, #f0d896 80%, #8a6a2f 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: clamp(30px, 6.4vw, 50px);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.06em;
}

.g_lead {
  max-width: 740px;
  margin: 0 0 8px;
  color: #d9d0bd;
}

.g_layout {
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  margin-top: 28px;
}

.g_toc {
  position: sticky;
  top: 16px;
  z-index: 5;
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  padding: 18px 12px;
  border: 1px solid rgba(200, 169, 106, 0.24);
  background-color: rgba(10, 9, 8, 0.9);
  scrollbar-width: none;
}
.g_toc::-webkit-scrollbar {
  display: none;
}

.g_toc_head {
  margin: 0 0 6px 10px;
  color: #c8a96a;
  font-size: 11px;
  letter-spacing: 0.4em;
}

.g_toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: toc;
}

.g_toc li {
  margin: 0;
  counter-increment: toc;
}

.g_toc li + li {
  margin-top: 1px;
}

.g_toc a {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 34px;
  padding: 2px 12px;
  color: #cfc5b0;
  font-size: 13.5px;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.2s, color 0.2s;
}
.g_toc a::before {
  content: counter(toc, decimal-leading-zero);
  flex-shrink: 0;
  color: rgba(200, 169, 106, 0.6);
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: 13px;
}
.g_toc a:hover {
  background-color: rgba(200, 169, 106, 0.08);
  color: #fff6e0;
}
.g_toc a.is_now {
  background: linear-gradient(90deg, rgba(200, 169, 106, 0.22), rgba(200, 169, 106, 0.02));
  box-shadow: inset 2px 0 0 #f0d896;
  color: #f0d896;
}
.g_toc a.is_now::before {
  color: #f0d896;
}

.g_main {
  min-width: 0;
}

.g_sec {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 36px;
  align-items: start;
  margin-top: 22px;
  padding: 36px clamp(20px, 4vw, 48px);
  border: 1px solid rgba(200, 169, 106, 0.24);
  background: #0f0e0c;
  box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.9), inset 0 1px 0 rgba(255, 241, 201, 0.06);
  scroll-margin-top: 20px;
}
.g_sec h2 {
  margin: 0 0 14px;
  color: #f0d896;
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: clamp(21px, 4.4vw, 27px);
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.04em;
}
.g_sec h3 {
  margin: 22px 0 8px;
  color: #f0d896;
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: 18px;
  font-weight: 600;
}

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

.js_reveal .g_sec {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.js_reveal .g_sec.is_in {
  opacity: 1;
  transform: none;
}
.js_reveal .g_sec:target {
  opacity: 1;
  transform: none;
  transition: none;
}

.g_num {
  margin: 0;
  color: #c8a96a;
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: 15px;
  letter-spacing: 0.3em;
}

.g_steps {
  margin: 4px 0 16px;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.g_steps li {
  position: relative;
  margin: 0;
  padding: 12px 0 12px 46px;
  border-bottom: 1px solid rgba(200, 169, 106, 0.24);
  counter-increment: step;
}
.g_steps li::before {
  content: counter(step);
  position: absolute;
  top: 12px;
  left: 0;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid #c8a96a;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, rgba(240, 216, 150, 0.25), transparent 70%);
  color: #f0d896;
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: 16px;
  line-height: 1;
}

.g_list {
  margin: 4px 0 16px;
  padding-left: 1.3em;
}
.g_list li + li {
  margin-top: 8px;
}
.g_list li::marker {
  color: #c8a96a;
}

.g_tip {
  margin: 8px 0 0;
  padding: 12px 16px;
  border-left: 2px solid #c8a96a;
  background: rgba(200, 169, 106, 0.08);
  color: #e3d9c2;
  font-size: 15px;
}

.g_fig {
  position: sticky;
  top: 20px;
  margin: 0;
}
.g_fig img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(200, 169, 106, 0.45);
  border-radius: 18px;
  background-color: #000;
  box-shadow: 0 18px 40px -16px rgba(0, 0, 0, 0.9), 0 0 24px -8px rgba(200, 169, 106, 0.25);
}
.g_fig figcaption {
  margin-top: 10px;
  color: #a59a84;
  font-size: 14px;
  text-align: center;
}

.g_fig_pair {
  display: grid;
  gap: 14px;
  position: static;
}

.g_faq details {
  border-bottom: 1px solid rgba(200, 169, 106, 0.24);
}
.g_faq details[open] summary::after {
  transform: rotate(45deg);
}

.g_faq summary {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 52px;
  padding: 12px 40px 12px 0;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}
.g_faq summary::-webkit-details-marker {
  display: none;
}
.g_faq summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 6px;
  margin-top: -14px;
  color: #f0d896;
  font-size: 24px;
  line-height: 28px;
  transition: transform 0.2s;
}

.g_faq details p {
  padding: 0 0 14px;
}

.g_foot {
  margin-top: 40px;
  color: #a59a84;
  font-size: 14px;
  text-align: center;
}

.g_open {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 36px;
  border: 1px solid #f0d896;
  background: linear-gradient(100deg, #8a6a2f 0%, #e9cf8c 22%, #fff1c9 38%, #b8904a 58%, #f0d896 80%, #8a6a2f 100%);
  color: #1a140a;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-decoration: none;
  white-space: nowrap;
}

.g_links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
  margin: 22px 0 10px;
}
.g_links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

@media (prefers-reduced-motion: reduce) {
  .js_reveal .g_sec {
    opacity: 1;
    transform: none;
    transition: none;
  }
}
@media (max-width: 900px) {
  .g_layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    margin-top: 20px;
  }
  .g_toc {
    top: 0;
    max-height: none;
    margin: 0 -16px;
    padding: 8px 16px;
    overflow-x: auto;
    overflow-y: hidden;
    border-width: 0 0 1px;
    scrollbar-width: none;
  }
  .g_toc::-webkit-scrollbar {
    display: none;
  }
  .g_toc_head {
    display: none;
  }
  .g_toc ol {
    display: flex;
    gap: 6px;
    width: max-content;
  }
  .g_toc li {
    flex-shrink: 0;
  }
  .g_toc li + li {
    margin-top: 0;
  }
  .g_toc a {
    min-height: 40px;
    padding: 4px 14px;
    border: 1px solid rgba(200, 169, 106, 0.24);
  }
  .g_toc a.is_now {
    border-color: #f0d896;
    background: rgba(200, 169, 106, 0.2);
    box-shadow: 0 0 14px rgba(200, 169, 106, 0.3);
  }
  .g_sec {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    scroll-margin-top: 72px;
  }
  .g_fig {
    position: static;
    width: min(100%, 300px);
    margin: 0 auto;
  }
  .g_fig_pair {
    width: min(100%, 560px);
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .g_fig_pair figcaption {
    grid-column: 1/-1;
  }
}
@media (max-width: 640px) {
  .g_sec {
    padding: 28px 18px;
  }
  .g_fig img {
    border-radius: 14px;
  }
}