:root {
  --color-text: #171717;
  --color-accent: #8cbadb;
  --color-nav-bg: #274030;
  --color-nav-text: #f4f5ed;
  --color-footer-bg: #263643;
  --color-footer-text: #f4f5ed;
  --max-width: 1100px;
  --color-section-bg: #ffffff;
  --color-section-bg-alt: rgba(140, 186, 219, 0.08);
}

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

body {
  margin: 0;
  font-family: "Noto Sans JP", sans-serif;
  color: var(--color-text);
  background-color: #fff;
  line-height: 1.7;
  transition: background-color 0.4s ease, color 0.4s ease;
  position: relative;
}

html {
  scroll-behavior: smooth;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-nav-bg);
  color: var(--color-nav-text);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1rem;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-nav-text);
  font-weight: 700;
  font-size: 1.125rem;
}

.brand-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.primary-nav a {
  position: relative;
  color: var(--color-nav-text);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
}

.primary-nav a:hover,
.primary-nav a:focus {
  text-decoration: none;
}

.primary-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.25rem;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left;
  background-color: var(--color-accent);
  transition: transform 0.2s ease;
}

.primary-nav a:hover::after,
.primary-nav a:focus::after,
.primary-nav a.active::after {
  transform: scaleX(1);
}

.language-switcher {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--color-nav-text);
}

.globe-icon {
  font-size: 1.1rem;
}

.language-switcher select {
  background: transparent;
  border: 1px solid rgba(244, 245, 237, 0.4);
  border-radius: 4px;
  color: var(--color-nav-text);
  padding: 0.35rem 1.25rem 0.35rem 0.5rem;
  font-size: 0.9rem;
  font-family: inherit;
  appearance: none;
  cursor: pointer;
}

.language-switcher select:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.language-switcher {
  position: relative;
}

.language-switcher::after {
  content: "▾";
  position: absolute;
  right: 0.5rem;
  pointer-events: none;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  background: transparent;
  border: none;
  cursor: pointer;
}

.menu-line {
  width: 24px;
  height: 2px;
  background-color: var(--color-nav-text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.hero {
  position: relative;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  overflow: hidden;
}

.hero-video {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: translate(-50%, -50%);
  filter: brightness(70%);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(23, 23, 23, 0.3), rgba(23, 23, 23, 0.6));
}

.hero-content {
  position: relative;
  max-width: 680px;
  padding: 2rem 1.5rem;
  z-index: 1;
}

.hero-content h1 {
  font-size: 2.2rem;
  margin-bottom: 1rem;
  font-weight: 700;
}

.hero-content p {
  font-size: 1.1rem;
  margin: 0;
}

.content-section {
  padding: 4rem 1rem;
  background-color: var(--color-section-bg);
  transition: background-color 0.4s ease;
}

.content-section:nth-of-type(even):not(.terms) {
  background-color: var(--color-section-bg-alt);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-inner h2 {
  font-size: 1.75rem;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.section-inner p {
  margin: 0;
}

.section-figure {
  margin: 1.75rem 0 0;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 25px rgba(23, 23, 23, 0.15);
}

.section-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 600px;
  object-fit: cover;
}

.embed-frame {
  position: relative;
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  background-color: #000;
  margin: 1.5rem 0;
}

.responsive-iframe {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  border: 0;
  min-height: 280px;
}

.model-embed {
  background-color: #000;
}

.embed-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.embed-item {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.embed-grid .embed-frame {
  margin: 0;
}

@media (min-width: 960px) {
  .embed-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2rem;
  }
}

[data-comparison] {
  --position: 50;
  position: relative;
  margin-top: 2.5rem;
}

.comparison-visual {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 14px;
  overflow: hidden;
  background-color: #000;
}

.comparison-layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}

.comparison-layer--before {
  z-index: 2;
  clip-path: inset(0 calc(100% - (var(--position) * 1%)) 0 0);
}

.comparison-layer--after {
  z-index: 1;
}

.comparison-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(var(--position) * 1%);
  width: 2px;
  background-color: rgba(244, 245, 237, 0.85);
  transform: translateX(-50%);
  pointer-events: none;
}

.comparison-handle::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid rgba(244, 245, 237, 0.95);
  background-color: rgba(39, 64, 48, 0.7);
  transform: translate(-50%, -50%);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

.comparison-input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: col-resize;
}

.comparison-label {
  position: absolute;
  top: 1rem;
  padding: 0.35rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-nav-text);
  background-color: rgba(39, 64, 48, 0.75);
  border-radius: 999px;
  pointer-events: none;
  z-index: 3;
}

.comparison-label--before {
  left: 1rem;
}

.comparison-label--after {
  right: 1rem;
}

.site-footer {
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: 1.5rem 1rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

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

.terms {
  background-color: #f9f9f9;
}

body.theme-damage {
  --color-text: #f4f5ed;
  --color-section-bg: rgba(12, 20, 16, 0.82);
  --color-section-bg-alt: rgba(12, 20, 16, 0.75);
  background-color: #0a110d;
  color: var(--color-text);
}

body.theme-damage main a,
body.theme-damage .site-footer a {
  color: #9ac4e6;
}

body.theme-damage .section-figure {
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.4);
}

body.theme-damage .terms {
  background-color: rgba(12, 20, 16, 0.85);
}

body.theme-damage .site-header {
  background-color: var(--color-nav-bg);
  color: var(--color-nav-text);
}

body.theme-damage .brand,
body.theme-damage .primary-nav a,
body.theme-damage .globe-icon,
body.theme-damage .language-switcher select {
  color: var(--color-nav-text);
}

body.theme-damage .language-switcher select {
  border-color: rgba(244, 245, 237, 0.4);
}

body.theme-damage .menu-line {
  background-color: var(--color-nav-text);
}

.terms-back {
  margin-top: 1.5rem;
}

.terms-back a {
  font-weight: 600;
}

@media (max-width: 960px) {
  .nav-container {
    flex-wrap: wrap;
  }
}

@media (max-width: 768px) {
  .primary-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    flex-direction: column;
    align-items: stretch;
    background-color: var(--color-nav-bg);
    padding: 1rem;
    gap: 1rem;
    transform: scaleY(0);
    transform-origin: top;
    transition: transform 0.2s ease;
  }

  .site-header.nav-open .primary-nav {
    transform: scaleY(1);
  }

  .language-switcher {
    margin-left: auto;
  }

  .menu-toggle {
    display: flex;
  }

  .site-header.nav-open .menu-line:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .site-header.nav-open .menu-line:nth-child(2) {
    opacity: 0;
  }

  .site-header.nav-open .menu-line:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
}

@media (max-width: 600px) {
  .hero {
    min-height: 55vh;
  }

  .hero-content h1 {
    font-size: 1.7rem;
  }

  .hero-content p {
    font-size: 1rem;
  }

  .brand {
    font-size: 1rem;
  }

  .comparison-label {
    font-size: 0.75rem;
    top: 0.75rem;
    padding: 0.3rem 0.7rem;
  }

  .section-figure img {
    max-height: 300px;
  }

  .globe-icon {
    display: none;
  }
}