/* WHX.JP v2 — clean static design system */
:root {
  --bg: #060a08;
  --bg-elevated: #0a120f;
  --surface: #0f1714;
  --surface-strong: #15221d;
  --text: #f7f7f8;
  --muted: #a5a8b2;
  --faint: #727783;
  --line: #22342c;
  --line-strong: #315344;
  --accent: #3ee58c;
  --accent-soft: rgba(62, 229, 140, 0.12);
  --accent-line: rgba(62, 229, 140, 0.42);
  --mint: #8bf7c1;
  --warning: #ffc66d;
  --danger: #ff7676;
  --max: 1280px;
  --reading: 820px;
  --radius: 14px;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
}

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

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body.v2 {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 84% 4%, rgba(62, 229, 140, 0.09), transparent 30rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, "Noto Sans JP", "Yu Gothic UI", "Yu Gothic", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.68;
  letter-spacing: 0.01em;
  text-rendering: optimizeLegibility;
}

body.v2 img {
  display: block;
  max-width: 100%;
}

body.v2 a {
  color: inherit;
  text-decoration: none;
}

body.v2 button,
body.v2 summary {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  transform: translateY(-150%);
  padding: 0.65rem 0.9rem;
  border-radius: 8px;
  background: var(--text);
  color: var(--bg);
  font-weight: 800;
}

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

.container {
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

.reading-width {
  width: min(calc(100% - 40px), var(--reading));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(8, 9, 12, 0.88);
  backdrop-filter: blur(18px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
  font-size: 1.08rem;
  font-weight: 900;
  letter-spacing: -0.03em;
}

.brand img {
  width: 38px;
  height: 38px;
  object-fit: contain;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.desktop-nav a {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 750;
  transition: color 160ms ease;
}

.desktop-nav a:hover,
.desktop-nav a[aria-current="page"] {
  color: var(--text);
}

.desktop-nav a[aria-current="page"] {
  position: relative;
}

.desktop-nav a[aria-current="page"]::after {
  position: absolute;
  right: 0;
  bottom: -0.75rem;
  left: 0;
  height: 2px;
  border-radius: 999px;
  background: var(--accent);
  content: "";
}

.mobile-nav {
  display: none;
  position: relative;
}

.mobile-nav summary {
  cursor: pointer;
  list-style: none;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 750;
}

.mobile-nav summary::-webkit-details-marker {
  display: none;
}

.mobile-nav nav {
  position: absolute;
  top: calc(100% + 0.7rem);
  right: 0;
  display: grid;
  min-width: 190px;
  padding: 0.5rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-strong);
  box-shadow: var(--shadow);
}

.mobile-nav nav a {
  padding: 0.65rem 0.75rem;
  border-radius: 7px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.mobile-nav nav a:hover,
.mobile-nav nav a[aria-current="page"] {
  background: var(--accent-soft);
  color: var(--text);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(340px, 0.95fr);
  align-items: center;
  gap: clamp(2rem, 4vw, 4rem);
  padding-block: clamp(3.5rem, 5vw, 4.5rem);
}

.hero-copy {
  max-width: 650px;
}

.page-home .home-hero {
  grid-template-columns: 1fr;
  min-height: 590px;
  place-items: center;
  padding-block: clamp(4.5rem, 8vw, 7rem);
  background: radial-gradient(circle at 50% 40%, rgba(62, 229, 140, 0.12), transparent 48%);
  text-align: center;
}

.page-home .home-hero-copy {
  width: min(100%, 980px);
  max-width: none;
  margin-inline: auto;
}

.page-home .home-hero .eyebrow {
  display: inline-flex;
  margin-bottom: 1.35rem;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--accent-line);
  border-radius: 999px;
  background: var(--accent-soft);
}

.page-home .home-hero h1 {
  max-width: 980px;
  margin-inline: auto;
  font-size: clamp(3rem, 6vw, 5.25rem);
  line-height: 1.05;
}

.page-home .home-hero .lead {
  max-width: 760px;
  margin: 1.35rem auto 0;
}

.home-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(130px, 170px));
  justify-content: center;
  margin-top: 1.9rem;
}

.home-metric {
  padding: 0.15rem 1rem;
  border-left: 1px solid var(--line);
}

.home-metric:first-child {
  border-left: 0;
}

.home-metric strong {
  display: block;
  color: var(--accent);
  font-size: clamp(1.85rem, 3vw, 2.55rem);
  line-height: 1.1;
}

.home-metric span {
  display: block;
  margin-top: 0.35rem;
  color: var(--faint);
  font-size: 0.78rem;
  font-weight: 750;
}

.page-home .home-trust-row,
.page-home .home-hero .hero-actions {
  justify-content: center;
}

.page-home .home-trust-row {
  margin-top: 1.75rem;
}

.eyebrow {
  margin: 0 0 0.7rem;
  color: var(--accent);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero h1,
.page-hero h1 {
  margin: 0;
  font-size: clamp(2.75rem, 5.4vw, 4.75rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.055em;
}

.hero h1 em,
.page-hero h1 em {
  color: var(--accent);
  font-style: normal;
}

.lead {
  max-width: 620px;
  margin: 1.1rem 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.72;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.72rem 1.15rem;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  font-size: 0.92rem;
  font-weight: 850;
  line-height: 1.2;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #03160d;
}

.button-secondary {
  background: var(--surface);
  color: var(--text);
}

.button-secondary:hover {
  border-color: var(--accent-line);
  background: var(--surface-strong);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--accent);
  font-weight: 850;
}

.text-link:hover {
  text-decoration: underline;
  text-underline-offset: 0.25rem;
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
  color: var(--faint);
  font-size: 0.8rem;
  font-weight: 750;
}

.trust-row span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.trust-row span::before {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--mint);
  content: "";
}

.hero-card {
  width: min(100%, 460px);
  justify-self: end;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-card img {
  width: 100%;
  height: clamp(230px, 24vw, 300px);
  object-fit: cover;
}

.hero-card-body {
  padding: 1.25rem;
}

.hero-card-body h2,
.hero-card-body h3 {
  margin: 0;
  font-size: 1.3rem;
  line-height: 1.4;
}

.hero-card-body p {
  margin: 0.7rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 1rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--line);
}

.metric {
  padding: 0.8rem;
  background: var(--bg-elevated);
}

.metric strong {
  display: block;
  color: var(--text);
  font-size: 1.1rem;
}

.metric span {
  color: var(--faint);
  font-size: 0.72rem;
}

.section {
  padding-block: clamp(2.75rem, 3.5vw, 3.75rem);
}

.section-bordered {
  border-block: 1px solid var(--line);
  background: rgba(14, 16, 21, 0.62);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(300px, 1.15fr);
  align-items: end;
  gap: 1.5rem;
  margin-bottom: 1.7rem;
}

.section-heading h2,
.content-heading h2 {
  margin: 0;
  font-size: clamp(1.85rem, 3vw, 2.65rem);
  line-height: 1.2;
  letter-spacing: -0.045em;
}

.section-heading > p:last-child,
.content-heading > p:last-child {
  margin: 0;
  color: var(--muted);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.product-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.product-card > img {
  width: 100%;
  height: clamp(210px, 22vw, 260px);
  object-fit: cover;
  filter: saturate(0.86) contrast(1.04);
}

.product-card-content {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: clamp(1.2rem, 2vw, 1.6rem);
}

.product-card h3 {
  margin: 0;
  font-size: clamp(1.45rem, 2.5vw, 2rem);
  line-height: 1.3;
}

.product-card p {
  color: var(--muted);
}

.product-card .text-link {
  margin-top: auto;
  padding-top: 1rem;
}

.check-list,
.plain-list {
  display: grid;
  gap: 0.4rem;
  margin: 0.75rem 0 0;
  padding: 0;
  list-style: none;
}

.check-list li,
.plain-list li {
  position: relative;
  padding-left: 1.35rem;
  color: var(--muted);
}

.check-list li::before {
  position: absolute;
  top: 0;
  left: 0;
  color: var(--accent);
  content: "✓";
  font-weight: 900;
}

.plain-list li::before {
  position: absolute;
  top: 0.72em;
  left: 0.15rem;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

.feature-grid,
.value-grid,
.step-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.feature-card,
.value-card,
.step-card {
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--surface);
}

.feature-card h3,
.value-card h3,
.step-card h3 {
  margin: 0.4rem 0 0.4rem;
  font-size: 1.05rem;
}

.feature-card p,
.value-card p,
.step-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.card-number {
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.page-hero {
  padding-block: clamp(3.25rem, 4vw, 4rem);
  border-bottom: 1px solid var(--line);
}

.page-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 0.85fr);
  align-items: center;
  gap: clamp(2rem, 4vw, 3.5rem);
}

.page-hero-image {
  width: min(100%, 500px);
  margin: 0;
  justify-self: end;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.page-hero-image img {
  width: 100%;
  height: clamp(250px, 27vw, 320px);
  object-fit: cover;
}

.page-hero-image figcaption {
  padding: 0.7rem 0.85rem;
  color: var(--faint);
  font-size: 0.75rem;
  font-weight: 700;
}

.feature-groups {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.feature-group {
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--surface);
}

.feature-group h3 {
  margin: 0;
  color: var(--accent);
  font-size: 1rem;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.preview-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--surface);
}

.preview-card img {
  width: 100%;
  height: clamp(170px, 18vw, 220px);
  object-fit: cover;
}

.preview-card p {
  margin: 0;
  padding: 0.7rem 0.85rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 750;
}

.purchase-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 1.5rem;
  padding: clamp(1.4rem, 2.5vw, 2rem);
  border: 1px solid var(--accent-line);
  border-radius: var(--radius);
  background: linear-gradient(120deg, var(--accent-soft), var(--surface) 58%);
}

.purchase-panel h2 {
  margin: 0;
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  line-height: 1.25;
}

.purchase-panel p {
  max-width: 700px;
  margin: 0.55rem 0 0;
  color: var(--muted);
}

.notice {
  padding: 1rem 1.15rem;
  border: 1px solid rgba(255, 198, 109, 0.34);
  border-radius: 9px;
  background: rgba(255, 198, 109, 0.08);
  color: #e6d0a8;
  font-size: 0.88rem;
}

.notice-danger {
  border-color: rgba(255, 118, 118, 0.38);
  background: rgba(255, 118, 118, 0.08);
  color: #f1b1b1;
}

.blog-hero,
.simple-hero {
  padding-block: clamp(3rem, 4vw, 4rem);
  border-bottom: 1px solid var(--line);
  text-align: center;
}

.blog-hero h1,
.simple-hero h1 {
  max-width: 850px;
  margin: 0 auto;
  font-size: clamp(2.7rem, 5vw, 4.5rem);
  line-height: 1.12;
  letter-spacing: -0.05em;
}

.blog-hero .lead,
.simple-hero .lead {
  margin-inline: auto;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.55rem;
  margin-top: 1.2rem;
}

.tag {
  width: fit-content;
  align-self: flex-start;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 800;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.blog-list-section {
  padding-top: clamp(2.5rem, 5vw, 4rem);
}

.blog-list-section .section-heading h1 {
  margin: 0;
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  line-height: 1.2;
  letter-spacing: -0.045em;
}

.article-card {
  display: flex;
  min-height: 205px;
  flex-direction: column;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--surface);
  transition: transform 160ms ease, border-color 160ms ease;
}

.article-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-line);
}

.article-card h2 {
  margin: 0.6rem 0;
  font-size: 1.08rem;
  line-height: 1.55;
}

.article-card p {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.article-card .text-link {
  margin-top: auto;
  font-size: 0.85rem;
}

.faq-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  align-items: start;
  gap: 2.25rem;
}

.faq-nav {
  position: sticky;
  top: 100px;
  display: grid;
  gap: 0.4rem;
}

.faq-nav a {
  padding: 0.55rem 0.7rem;
  border-radius: 7px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.faq-nav a:hover {
  background: var(--surface);
  color: var(--text);
}

.faq-group + .faq-group {
  margin-top: 2.5rem;
}

.faq-group h2 {
  margin: 0 0 1rem;
  font-size: 1.55rem;
}

.faq-item {
  border-top: 1px solid var(--line);
}

.faq-item:last-child {
  border-bottom: 1px solid var(--line);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 1rem;
  cursor: pointer;
  list-style: none;
  padding: 0.85rem 0;
  color: var(--accent);
  font-weight: 800;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::before {
  flex: 0 0 auto;
  content: "Q";
  font-size: 0.85rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.faq-item summary::after {
  flex: 0 0 auto;
  margin-left: auto;
  color: var(--accent);
  content: "+";
  font-size: 1.3rem;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-answer {
  display: grid;
  grid-template-columns: 1.25rem minmax(0, 1fr);
  gap: 0.75rem;
  padding: 0 2rem 0.9rem 0;
  color: #dde0e6;
}

.faq-answer::before {
  color: var(--mint);
  content: "A";
  font-size: 0.85rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.faq-answer p {
  margin: 0;
  color: inherit;
}

.terms-intro {
  margin-bottom: 1.5rem;
  padding: 1.1rem;
  border: 1px solid rgba(255, 118, 118, 0.35);
  border-radius: 10px;
  background: rgba(255, 118, 118, 0.08);
}

.terms-intro strong {
  display: block;
  color: #ffaaaa;
  font-size: 1.05rem;
}

.terms-section {
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
}

.terms-section h2 {
  margin: 0 0 0.9rem;
  font-size: clamp(1.45rem, 3vw, 2rem);
}

.terms-section h3 {
  margin: 1.35rem 0 0.45rem;
  color: var(--text);
  font-size: 1.05rem;
}

.terms-section p,
.terms-section li {
  color: var(--muted);
}

.terms-section ul {
  display: grid;
  gap: 0.5rem;
  padding-left: 1.2rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #06070a;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2rem;
  padding-block: 2.2rem;
}

.footer-copy {
  max-width: 520px;
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(120px, auto));
  gap: 0.65rem 2rem;
}

.footer-links a {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.footer-links a:hover {
  color: var(--text);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.1rem;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 0.75rem;
}

@media (min-width: 1200px) {
  .article-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .desktop-nav {
    display: none;
  }

  .mobile-nav {
    display: block;
  }

  .hero,
  .page-hero-grid {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero-card,
  .page-hero-image {
    width: min(100%, 680px);
    justify-self: start;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

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

  .faq-layout {
    grid-template-columns: 1fr;
  }

  .faq-nav {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .container,
  .reading-width {
    width: min(calc(100% - 28px), var(--max));
  }

  .header-inner {
    min-height: 64px;
  }

  .brand img {
    width: 34px;
    height: 34px;
  }

  .hero,
  .page-hero,
  .blog-hero,
  .simple-hero {
    padding-block: 3rem;
  }

  .page-home .home-hero {
    min-height: auto;
    padding-block: 4rem;
  }

  .page-home .home-hero h1 {
    font-size: clamp(2.35rem, 11vw, 3.35rem);
  }

  .home-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    width: 100%;
  }

  .home-metric {
    padding-inline: 0.45rem;
  }

  .page-home .home-trust-row {
    justify-content: center;
    gap: 0.75rem 1rem;
  }

  .hero h1,
  .page-hero h1,
  .blog-hero h1,
  .simple-hero h1 {
    font-size: clamp(2.2rem, 10vw, 3.1rem);
  }

  .hero-actions,
  .purchase-panel {
    align-items: stretch;
    grid-template-columns: 1fr;
  }

  .hero-actions .button,
  .purchase-panel .button {
    width: 100%;
  }

  .metric-grid,
  .product-grid,
  .feature-grid,
  .value-grid,
  .step-grid,
  .feature-groups,
  .preview-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

  .metric-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero-card img,
  .page-hero-image img,
  .product-card > img,
  .preview-card img {
    height: 210px;
  }

  .faq-nav {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-links {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-bottom {
    flex-direction: column;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms;
  }
}