:root {
  color-scheme: dark;
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
  color: #f5f2ee;
  background: #101114;
  font-synthesis: none;
  --surface: #191a1f;
  --surface-soft: #202127;
  --text: #f5f2ee;
  --muted: #b6b3b0;
  --dim: #85858c;
  --primary: #ffb4c2;
  --primary-strong: #ff91aa;
  --border: rgb(255 255 255 / 0.12);
  --wood: #9b6743;
  --wood-dark: #3b2118;
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background:
    radial-gradient(circle at 92% 8%, rgb(255 180 194 / 0.09), transparent 28rem),
    #101114;
  color: var(--text);
  line-height: 1.7;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--text);
  color: #101114;
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.guide-header {
  position: relative;
  z-index: 10;
  border-bottom: 1px solid var(--border);
  background: rgb(16 17 20 / 0.88);
  backdrop-filter: blur(16px);
}

.guide-header__inner {
  display: flex;
  width: min(calc(100% - 40px), var(--max-width));
  min-height: 82px;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.guide-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.guide-brand img {
  width: 46px;
  height: 46px;
}

.guide-brand span {
  display: grid;
}

.guide-brand strong {
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

.guide-brand small {
  color: var(--dim);
  font-size: 0.7rem;
}

.guide-nav,
.guide-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.guide-nav > a:not(.guide-button) {
  min-height: 44px;
  padding: 10px 8px;
  color: var(--muted);
  text-underline-offset: 4px;
}

.guide-button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 13px 22px;
  border: 1px solid var(--primary);
  border-radius: 999px;
  background: var(--primary);
  color: #21171a;
  font-size: 0.88rem;
  font-weight: 800;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
  transition: transform 160ms ease, background 160ms ease;
}

.guide-button:hover {
  background: #ffc3ce;
  transform: translateY(-1px);
}

.guide-button:focus-visible,
.guide-nav a:focus-visible,
.guide-footer a:focus-visible,
.privacy-grid a:focus-visible,
.faq-list summary:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 4px;
}

.guide-button--compact {
  min-height: 44px;
  padding: 10px 17px;
}

.guide-button--secondary {
  border-color: var(--border);
  background: transparent;
  color: var(--text);
}

.guide-hero {
  display: grid;
  width: min(calc(100% - 40px), var(--max-width));
  min-height: 620px;
  margin: 0 auto;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  align-items: center;
  gap: clamp(40px, 8vw, 96px);
  padding: 80px 0;
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--primary);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.17em;
}

.guide-hero h1 {
  max-width: 14ch;
  margin: 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(2.55rem, 6vw, 5.2rem);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 1.18;
}

.guide-lead {
  max-width: 42rem;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.15rem);
}

.guide-actions {
  margin-top: 30px;
  flex-wrap: wrap;
}

.trust-list {
  display: flex;
  margin: 28px 0 0;
  padding: 0;
  flex-wrap: wrap;
  gap: 10px 18px;
  color: var(--muted);
  font-size: 0.78rem;
  list-style: none;
}

.trust-list span {
  color: var(--primary);
  font-weight: 900;
}

.guide-hero__visual {
  display: grid;
  place-items: center;
}

.mini-shelf {
  position: relative;
  width: min(100%, 420px);
  aspect-ratio: 0.86;
  padding: 42px 32px 28px;
  border: 14px solid var(--wood);
  border-radius: 30px 30px 18px 18px;
  background:
    linear-gradient(rgb(255 255 255 / 0.04), transparent 40%),
    var(--wood-dark);
  box-shadow: 0 34px 80px rgb(0 0 0 / 0.42), inset 0 0 0 3px rgb(0 0 0 / 0.28);
}

.mini-shelf > span {
  display: block;
  height: 15px;
  margin: 30px -20px 34px;
  border-radius: 4px;
  background: linear-gradient(#b8794e, #78452e);
  box-shadow: 0 7px 18px rgb(0 0 0 / 0.42);
}

.mini-shelf__books {
  display: flex;
  height: 36%;
  align-items: flex-end;
  gap: 14px;
}

.mini-shelf__books i {
  display: block;
  width: 22%;
  height: 88%;
  border-radius: 5px 8px 3px 3px;
  background: linear-gradient(110deg, #c9b38b, #ece1c9 58%, #a04e5f 59%);
  box-shadow: 5px 7px 14px rgb(0 0 0 / 0.35);
  transform: rotate(-2deg);
}

.mini-shelf__books i:nth-child(2) {
  height: 100%;
  background: linear-gradient(120deg, #3a7084, #75a4a7 60%, #d7c17d 61%);
  transform: rotate(1deg);
}

.mini-shelf__books i:nth-child(3) {
  height: 82%;
  background: linear-gradient(120deg, #bd6d56, #dcaa78 65%, #4f3228 66%);
}

.mini-shelf__books i:nth-child(4) {
  height: 94%;
  background: linear-gradient(120deg, #676a8c, #ada9c8 64%, #eee4d4 65%);
  transform: rotate(2deg);
}

.mini-shelf__books--lower {
  height: 28%;
}

.mini-shelf strong {
  position: absolute;
  right: 22px;
  bottom: 13px;
  color: var(--primary);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
}

.content-section,
.guide-cta {
  width: min(calc(100% - 40px), var(--max-width));
  margin: 0 auto;
  padding: 92px 0;
  border-top: 1px solid var(--border);
}

.content-section > h2,
.guide-cta h2 {
  max-width: 22ch;
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 3.35rem);
  line-height: 1.32;
}

.section-intro {
  max-width: 48rem;
  margin: 20px 0 0;
  color: var(--muted);
}

.feature-grid,
.privacy-grid {
  display: grid;
  margin-top: 42px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.feature-grid article,
.privacy-grid article {
  min-width: 0;
  padding: clamp(22px, 4vw, 32px);
  border: 1px solid var(--border);
  border-radius: 22px;
  background: var(--surface);
}

.feature-grid span {
  color: var(--primary);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.16em;
}

.feature-grid h3,
.privacy-grid h3,
.step-list h3 {
  margin: 12px 0 8px;
  font-size: 1.12rem;
}

.feature-grid p,
.privacy-grid p,
.step-list p {
  margin: 0;
  color: var(--muted);
  font-size: 0.91rem;
}

.privacy-grid a {
  color: var(--primary);
  text-underline-offset: 4px;
}

.content-section--warm {
  width: 100%;
  max-width: none;
  padding-right: max(20px, calc((100% - var(--max-width)) / 2));
  padding-left: max(20px, calc((100% - var(--max-width)) / 2));
  border-top: 0;
  background:
    linear-gradient(135deg, rgb(155 103 67 / 0.14), transparent 55%),
    var(--surface);
}

.step-list {
  display: grid;
  max-width: 860px;
  margin: 42px 0 0;
  padding: 0;
  gap: 14px;
  list-style: none;
}

.step-list li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  align-items: start;
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--border);
}

.step-list li > span {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border: 1px solid rgb(255 180 194 / 0.46);
  border-radius: 50%;
  color: var(--primary);
  font-weight: 900;
}

.step-list h3 {
  margin-top: 0;
}

.content-section--faq {
  max-width: 860px;
}

.faq-list {
  display: grid;
  margin-top: 36px;
  gap: 10px;
}

.faq-list details {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
}

.faq-list summary {
  min-height: 58px;
  padding: 16px 48px 16px 20px;
  cursor: pointer;
  font-weight: 800;
}

.faq-list p {
  margin: 0;
  padding: 0 20px 20px;
  color: var(--muted);
}

.guide-cta {
  text-align: center;
}

.guide-cta h2 {
  margin-right: auto;
  margin-left: auto;
}

.guide-cta p:not(.section-kicker) {
  margin: 16px 0 26px;
  color: var(--muted);
}

.guide-footer {
  padding: 44px max(20px, calc((100% - var(--max-width)) / 2));
  border-top: 1px solid var(--border);
  background: #0b0c0e;
  color: var(--dim);
  font-size: 0.75rem;
}

.adsense-disclosure {
  max-width: 780px;
  margin: 0 0 22px;
}

.guide-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
}

.guide-footer a {
  color: var(--muted);
  text-underline-offset: 4px;
}

@media (max-width: 760px) {
  .guide-header__inner {
    width: min(calc(100% - 28px), var(--max-width));
    min-height: 72px;
  }

  .guide-brand small {
    display: none;
  }

  .guide-nav > a:not(.guide-button) {
    padding-right: 3px;
    padding-left: 3px;
  }

  .guide-button--compact {
    padding-right: 14px;
    padding-left: 14px;
  }

  .guide-hero {
    width: min(calc(100% - 28px), var(--max-width));
    min-height: 0;
    grid-template-columns: 1fr;
    gap: 52px;
    padding: 58px 0 70px;
  }

  .guide-hero h1 {
    font-size: clamp(2.35rem, 12vw, 3.6rem);
  }

  .guide-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .guide-actions .guide-button {
    width: 100%;
  }

  .guide-hero__visual {
    padding: 0 16px;
  }

  .content-section,
  .guide-cta {
    width: min(calc(100% - 28px), var(--max-width));
    padding: 68px 0;
  }

  .content-section--warm {
    width: 100%;
    padding-right: 14px;
    padding-left: 14px;
  }

  .feature-grid,
  .privacy-grid {
    grid-template-columns: 1fr;
  }

  .step-list li {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 14px;
  }

  .step-list li > span {
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 430px) {
  .guide-brand img {
    width: 40px;
    height: 40px;
  }

  .guide-brand strong {
    max-width: 8.5rem;
    overflow: hidden;
    font-size: 0.9rem;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .guide-nav {
    gap: 7px;
  }

  .guide-button--compact {
    font-size: 0.76rem;
  }

  .trust-list {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .guide-button {
    transition: none;
  }
}