:root {
  --font-family-sans: "Noto Sans JP", system-ui, sans-serif;
  --font-family-serif: "Cinzel", serif;
  --font-size-root: 16px;
  --glass-blur: blur(16px);
  --motion-card: 0.6s cubic-bezier(0.19, 1, 0.22, 1);
  font-size: var(--font-size-root);
}

:root[data-theme="midnight"] {
  --color-scheme: dark;
  --bg-primary: radial-gradient(circle at 20% 20%, rgba(255, 165, 0, 0.25), transparent 55%),
    radial-gradient(circle at 80% 10%, rgba(135, 206, 250, 0.2), transparent 60%),
    linear-gradient(180deg, #070b20 0%, #040713 45%, #02030b 100%);
  --text-color: #f4f6ff;
  --muted-color: rgba(221, 235, 255, 0.7);
  --accent-color: #fdd06a;
  --accent-strong: #ff7f9f;
  --surface-header: rgba(12, 16, 35, 0.65);
  --surface-header-border: rgba(255, 255, 255, 0.08);
  --surface-header-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  --surface-header-glow: radial-gradient(circle, rgba(255, 215, 128, 0.9) 0%, rgba(255, 138, 222, 0.05) 70%);
  --scroll-border: rgba(255, 255, 255, 0.2);
  --scroll-border-hover: rgba(255, 255, 255, 0.6);
  --scroll-highlight: radial-gradient(circle, rgba(255, 128, 154, 0.6), transparent 65%);
  --card-bg: rgba(14, 20, 45, 0.7);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-border-hover: rgba(255, 255, 255, 0.4);
  --card-glow: radial-gradient(circle at top, rgba(255, 195, 113, 0.45), transparent 70%);
  --card-shadow-hover: 0 30px 60px rgba(13, 18, 40, 0.65);
  --footer-gradient: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.35));
  --spark-gradient: radial-gradient(circle, rgba(255, 255, 255, 0.9) 0%, rgba(255, 120, 169, 0.2) 70%, transparent 100%);
  --spark-shadow: 0 0 12px rgba(255, 189, 89, 0.8);
}

:root[data-theme="aurora"] {
  --color-scheme: dark;
  --bg-primary: radial-gradient(circle at 15% 25%, rgba(140, 220, 255, 0.35), transparent 60%),
    radial-gradient(circle at 85% 20%, rgba(255, 170, 255, 0.25), transparent 65%),
    linear-gradient(180deg, #08122a 0%, #0b1f35 45%, #05111f 100%);
  --text-color: #f5fbff;
  --muted-color: rgba(216, 236, 255, 0.78);
  --accent-color: #8bf1ff;
  --accent-strong: #ff9df5;
  --surface-header: rgba(13, 24, 43, 0.72);
  --surface-header-border: rgba(192, 232, 255, 0.18);
  --surface-header-shadow: 0 24px 60px rgba(3, 10, 22, 0.55);
  --surface-header-glow: radial-gradient(circle, rgba(155, 255, 245, 0.9) 0%, rgba(120, 105, 255, 0.1) 70%);
  --scroll-border: rgba(210, 240, 255, 0.35);
  --scroll-border-hover: rgba(210, 240, 255, 0.7);
  --scroll-highlight: radial-gradient(circle, rgba(110, 255, 233, 0.55), transparent 65%);
  --card-bg: rgba(10, 24, 45, 0.68);
  --card-border: rgba(210, 240, 255, 0.14);
  --card-border-hover: rgba(210, 240, 255, 0.45);
  --card-glow: radial-gradient(circle at top, rgba(136, 255, 240, 0.55), transparent 72%);
  --card-shadow-hover: 0 30px 60px rgba(6, 16, 28, 0.65);
  --footer-gradient: linear-gradient(180deg, transparent, rgba(3, 12, 21, 0.45));
  --spark-gradient: radial-gradient(circle, rgba(220, 255, 255, 0.95) 0%, rgba(120, 200, 255, 0.3) 70%, transparent 100%);
  --spark-shadow: 0 0 14px rgba(140, 255, 251, 0.8);
}

:root[data-theme="sunrise"] {
  --color-scheme: light;
  --bg-primary: radial-gradient(circle at 20% 15%, rgba(255, 226, 185, 0.55), transparent 60%),
    radial-gradient(circle at 80% 10%, rgba(255, 189, 220, 0.35), transparent 65%),
    linear-gradient(180deg, #fff1e8 0%, #ffe4c8 40%, #fbd6c2 100%);
  --text-color: #463328;
  --muted-color: rgba(86, 64, 55, 0.68);
  --accent-color: #ff8a4c;
  --accent-strong: #ff5e94;
  --surface-header: rgba(255, 255, 255, 0.82);
  --surface-header-border: rgba(255, 194, 153, 0.38);
  --surface-header-shadow: 0 22px 45px rgba(194, 122, 82, 0.25);
  --surface-header-glow: radial-gradient(circle, rgba(255, 218, 140, 0.85) 0%, rgba(255, 161, 181, 0.25) 70%);
  --scroll-border: rgba(255, 180, 120, 0.55);
  --scroll-border-hover: rgba(255, 140, 90, 0.8);
  --scroll-highlight: radial-gradient(circle, rgba(255, 200, 130, 0.7), transparent 65%);
  --card-bg: rgba(255, 255, 255, 0.88);
  --card-border: rgba(255, 200, 160, 0.42);
  --card-border-hover: rgba(255, 150, 110, 0.7);
  --card-glow: radial-gradient(circle at top, rgba(255, 194, 146, 0.6), transparent 70%);
  --card-shadow-hover: 0 30px 55px rgba(215, 140, 100, 0.3);
  --footer-gradient: linear-gradient(180deg, transparent, rgba(255, 205, 160, 0.6));
  --spark-gradient: radial-gradient(circle, rgba(255, 255, 255, 0.95) 0%, rgba(255, 200, 150, 0.4) 70%, transparent 100%);
  --spark-shadow: 0 0 12px rgba(255, 185, 120, 0.8);
}

:root[data-theme="forest"] {
  --color-scheme: dark;
  --bg-primary: radial-gradient(circle at 15% 20%, rgba(120, 200, 160, 0.25), transparent 60%),
    radial-gradient(circle at 75% 15%, rgba(90, 150, 255, 0.2), transparent 65%),
    linear-gradient(180deg, #07150d 0%, #0d2a18 40%, #05140c 100%);
  --text-color: #f3fff5;
  --muted-color: rgba(210, 235, 220, 0.75);
  --accent-color: #8ef08e;
  --accent-strong: #4de0c2;
  --surface-header: rgba(9, 32, 22, 0.72);
  --surface-header-border: rgba(180, 240, 210, 0.18);
  --surface-header-shadow: 0 24px 60px rgba(2, 24, 14, 0.55);
  --surface-header-glow: radial-gradient(circle, rgba(120, 255, 185, 0.85) 0%, rgba(120, 180, 255, 0.12) 70%);
  --scroll-border: rgba(180, 240, 210, 0.32);
  --scroll-border-hover: rgba(180, 240, 210, 0.65);
  --scroll-highlight: radial-gradient(circle, rgba(120, 255, 200, 0.6), transparent 65%);
  --card-bg: rgba(8, 36, 24, 0.7);
  --card-border: rgba(190, 245, 210, 0.14);
  --card-border-hover: rgba(190, 245, 210, 0.45);
  --card-glow: radial-gradient(circle at top, rgba(130, 255, 195, 0.55), transparent 72%);
  --card-shadow-hover: 0 30px 60px rgba(4, 24, 15, 0.65);
  --footer-gradient: linear-gradient(180deg, transparent, rgba(4, 18, 11, 0.45));
  --spark-gradient: radial-gradient(circle, rgba(240, 255, 245, 0.95) 0%, rgba(150, 255, 200, 0.35) 70%, transparent 100%);
  --spark-shadow: 0 0 14px rgba(140, 255, 200, 0.8);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color-scheme: var(--color-scheme, dark);
  font-family: var(--font-family-sans);
  color: var(--text-color);
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
}

.theme-switcher {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-radius: 999px;
  background: var(--surface-header);
  border: 1px solid var(--surface-header-border);
  box-shadow: var(--surface-header-shadow);
  backdrop-filter: var(--glass-blur);
  z-index: 5;
  font-size: 0.85rem;
}

.theme-switcher__label {
  font-family: var(--font-family-serif);
  letter-spacing: 0.35em;
  text-transform: uppercase;
  font-size: 0.65rem;
  margin-right: 0.25rem;
  color: var(--muted-color);
}

.theme-switcher__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  color: var(--text-color);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color 0.3s ease, background 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
}

.theme-switcher__link:hover,
.theme-switcher__link:focus-visible {
  border-color: var(--card-border-hover);
  transform: translateY(-2px);
}

.theme-switcher__link[aria-current="page"] {
  background: var(--accent-color);
  color: #19120a;
  border-color: transparent;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.25);
}

.theme-switcher__link[aria-current="page"]:hover,
.theme-switcher__link[aria-current="page"]:focus-visible {
  transform: translateY(-2px) scale(1.02);
}

@media (max-width: 640px) {
  .theme-switcher {
    position: sticky;
    top: 1rem;
    margin: 1rem auto 0;
    right: auto;
    background: var(--surface-header);
    border: 1px solid var(--surface-header-border);
    border-radius: 16px;
    padding: 0.5rem 0.6rem;
    gap: 0.35rem;
    flex-wrap: wrap;
    justify-content: center;
  }

  .theme-switcher__label {
    flex-basis: 100%;
    text-align: center;
    letter-spacing: 0.28em;
    font-size: 0.6rem;
  }

  .theme-switcher__link {
    font-size: 0.8rem;
    padding: 0.3rem 0.65rem;
  }
}

.sky {
  position: fixed;
  inset: 0;
  background: transparent;
  pointer-events: none;
  z-index: 0;
}

.page-header {
  position: relative;
  padding: 9rem 1.5rem 7rem;
  text-align: center;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.page-header::before,
.page-header::after {
  content: "";
  position: absolute;
  width: 70vmin;
  height: 70vmin;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.35;
  z-index: 0;
  background: var(--surface-header-glow);
  animation: float 18s infinite ease-in-out;
}

.page-header::before {
  top: -25vmin;
  left: -10vmin;
}

.page-header::after {
  bottom: -20vmin;
  right: -15vmin;
  animation-delay: -9s;
}

.page-header__content {
  max-width: 58rem;
  padding: 2rem 3rem;
  background: var(--surface-header);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--surface-header-border);
  border-radius: 28px;
  position: relative;
  z-index: 1;
  box-shadow: var(--surface-header-shadow);
}

.page-header__eyebrow {
  letter-spacing: 0.45em;
  text-transform: uppercase;
  font-family: var(--font-family-serif);
  font-size: 0.9rem;
  margin: 0 0 1.5rem;
  color: var(--muted-color);
}

.page-header__title {
  font-family: var(--font-family-serif);
  font-size: clamp(2.8rem, 4vw, 4.2rem);
  letter-spacing: 0.08em;
  margin: 0 0 1.25rem;
}

.page-header__subtitle {
  font-size: 1.05rem;
  line-height: 1.9;
  margin: 0 auto 2.5rem;
  color: var(--muted-color);
}

.page-header__scroll {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 4.5rem;
  height: 4.5rem;
  border-radius: 50%;
  border: 1px solid var(--scroll-border);
  color: var(--text-color);
  text-decoration: none;
  font-size: 0.9rem;
  letter-spacing: 0.15em;
  transition: transform 0.5s ease, background 0.5s ease, border-color 0.5s ease;
  position: relative;
  overflow: hidden;
}

.page-header__scroll::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--scroll-highlight);
  opacity: 0;
  transition: opacity 0.5s ease;
}

.page-header__scroll:hover,
.page-header__scroll:focus-visible {
  transform: translateY(6px);
  border-color: var(--scroll-border-hover);
}

.page-header__scroll:hover::after,
.page-header__scroll:focus-visible::after {
  opacity: 1;
}

.gallery {
  position: relative;
  z-index: 1;
  padding: 0 1.5rem 6rem;
  display: grid;
  gap: 5rem;
}

.gallery-section {
  display: grid;
  gap: 1.5rem;
}

.gallery-section__title {
  font-family: var(--font-family-serif);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  margin: 0;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-color);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2.5rem;
}

.gallery-card {
  background: var(--card-bg);
  border-radius: 26px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--card-border);
  display: flex;
  flex-direction: column;
  min-height: 100%;
  transition: transform var(--motion-card), box-shadow 0.6s ease, border-color 0.6s ease;
  position: relative;
}

.gallery-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--card-glow);
  opacity: 0;
  transition: opacity 0.6s ease;
  z-index: 0;
}

.gallery-card__image {
  padding-top: clamp(200px, 68%, 320px);
  aspect-ratio: 3 / 2;
  max-height: 260px;
  width: 100%;
  background-image: var(--image-url);
  background-size: cover;
  background-position: center;
  position: relative;
  z-index: 1;
}

.gallery-card__body {
  padding: 1.75rem 1.75rem 2.25rem;
  display: grid;
  gap: 0.75rem;
  z-index: 1;
}

.gallery-card__title {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.gallery-card__description {
  margin: 0;
  line-height: 1.8;
  color: var(--muted-color);
}

.gallery-card:hover,
.gallery-card:focus-visible {
  transform: translateY(-12px) scale(1.01);
  border-color: var(--card-border-hover);
  box-shadow: var(--card-shadow-hover);
}

.gallery-card:hover::before,
.gallery-card:focus-visible::before {
  opacity: 0.95;
}

.page-footer {
  margin-top: auto;
  padding: 3.5rem 1.5rem 3rem;
  text-align: center;
  background: var(--footer-gradient);
  color: var(--muted-color);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
}

.page-footer__note {
  margin: 0 0 1rem;
}

.page-footer__copyright {
  margin: 0;
  font-family: var(--font-family-serif);
  letter-spacing: 0.2em;
}

@keyframes float {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  50% {
    transform: translate3d(0, -6%, 0) scale(1.05);
  }
}

@media (max-width: 768px) {
  .page-header {
    padding: 7rem 1.25rem 6rem;
  }

  .page-header__content {
    padding: 2rem 1.75rem;
  }

  .page-header__scroll {
    width: 4rem;
    height: 4rem;
  }

  .gallery {
    gap: 3.5rem;
  }

  .gallery-card__body {
    padding: 1.5rem 1.5rem 2rem;
  }
}

@media (max-width: 480px) {
  .page-header__content {
    border-radius: 20px;
  }

  .gallery-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.1rem;
  }

  .gallery-card {
    border-radius: 20px;
  }

  .gallery-card__body {
    padding: 1.25rem 1.25rem 1.75rem;
  }
}

.sky__spark {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--spark-gradient);
  box-shadow: var(--spark-shadow);
  opacity: 0;
  animation: sparkle var(--duration, 6s) linear infinite;
}

@keyframes sparkle {
  0% {
    opacity: 0;
    transform: translateY(0) scale(0.8);
  }
  10% {
    opacity: 1;
    transform: translateY(-6vh) scale(1);
  }
  30% {
    opacity: 0.9;
    transform: translateY(-12vh) scale(1.15);
  }
  60% {
    opacity: 0.4;
    transform: translateY(-18vh) scale(0.9);
  }
  100% {
    opacity: 0;
    transform: translateY(-22vh) scale(0.6);
  }
}