:root {
  color-scheme: light dark;
  --color-primary: #9100ab;
  --color-primary-accent: #11007e;
  --color-background: #f7f9fc;
  --color-background-alt: #ffffff;
  --color-surface: #ffffff;
  --color-surface-subtle: #ffffff;
  --color-border: #e1e8f5;
  --color-border-muted: rgba(17, 0, 126, 0.1);
  --color-text: #111827;
  --color-text-muted: #4b5563;
  --color-overlay: rgba(145, 0, 171, 0.12);
  --color-focus-ring: rgba(17, 0, 126, 0.4);
  --color-embed-ring: rgba(145, 0, 171, 0.28);
  --shadow-soft: 0 22px 45px rgba(17, 0, 126, 0.12);
  --shadow-strong: 0 28px 65px rgba(17, 0, 126, 0.18);
  --page-transition-duration: 480ms;
  --page-transition-easing: cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme='dark'] {
  --color-background: #0b1120;
  --color-background-alt: #131a2b;
  --color-surface: #131a2b;
  --color-surface-subtle: #161f33;
  --color-border: rgba(244, 244, 255, 0.12);
  --color-border-muted: rgba(145, 0, 171, 0.4);
  --color-text: #f4f4ff;
  --color-text-muted: rgba(244, 244, 255, 0.75);
  --color-overlay: rgba(145, 0, 171, 0.2);
  --color-focus-ring: rgba(145, 0, 171, 0.55);
  --color-embed-ring: rgba(145, 0, 171, 0.55);
  --shadow-soft: 0 25px 55px rgba(9, 12, 28, 0.65);
  --shadow-strong: 0 36px 85px rgba(9, 12, 28, 0.7);
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--color-background);
  color: var(--color-text);
  font-family: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 100vh;
  opacity: 1;
  animation: page-fade-in var(--page-transition-duration) var(--page-transition-easing) forwards;
  transition:
    background 280ms ease,
    color 280ms ease,
    opacity var(--page-transition-duration) var(--page-transition-easing);
  will-change: opacity;
}

[data-theme='light'] body {
  background:
    radial-gradient(140% 120% at 12% -20%, rgba(145, 0, 171, 0.15) 0%, rgba(145, 0, 171, 0.06) 32%, transparent 68%),
    radial-gradient(120% 120% at 88% 0%, rgba(17, 0, 126, 0.1) 0%, rgba(17, 0, 126, 0.04) 40%, transparent 75%),
    linear-gradient(180deg, #f4f6ff 0%, #f7f9fc 55%, #f2ecff 100%);
}

[data-theme='dark'] body {
  background: var(--color-background);
}

html[data-i18n-preload='pending'] body {
  visibility: hidden;
}

@keyframes page-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes page-fade-out {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

html.page-transition-exiting body {
  animation: page-fade-out var(--page-transition-duration) var(--page-transition-easing) forwards;
  pointer-events: none;
}

html.locale-transition-active body {
  animation: none;
  opacity: 0;
  transition: opacity var(--page-transition-duration) var(--page-transition-easing);
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  body {
    animation: none;
    opacity: 1;
  }

  html.page-transition-exiting body {
    opacity: 1;
    pointer-events: auto;
  }

  html.locale-transition-active body {
    opacity: 1;
    pointer-events: auto;
  }
}

.app-skip {
  background: transparent;
  color: var(--color-text);
}

.app-skip:focus,
.app-skip:focus-visible {
  background: var(--color-background-alt);
  color: var(--color-text);
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 6px;
}

.app-navbar {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(18px);
}

.app-brand {
  color: var(--color-text);
}

.app-brand:hover {
  color: var(--color-primary);
}

.app-nav-list {
  color: var(--color-text-muted);
}

.app-nav-link {
  border-radius: 9999px;
  background: var(--color-background-alt);
  border: 1px solid transparent;
  color: var(--color-text);
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.app-nav-link:hover {
  background: var(--color-overlay);
  border-color: rgba(145, 0, 171, 0.35);
  color: var(--color-primary);
}

.app-nav-link:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 3px;
  box-shadow: none;
}

.app-nav-link[data-active='true'] {
  background: var(--color-overlay);
  border-color: rgba(145, 0, 171, 0.45);
  color: var(--color-primary);
  font-weight: 600;
}

[data-theme='dark'] .app-nav-link {
  background: var(--color-background-alt);
  border-color: transparent;
  color: var(--color-text);
}

[data-theme='dark'] .app-nav-link:hover {
  background: rgba(145, 0, 171, 0.2);
  border-color: rgba(145, 0, 171, 0.5);
  color: #f4f4ff;
}

[data-theme='dark'] .app-nav-link[data-active='true'] {
  background: rgba(145, 0, 171, 0.24);
  border-color: rgba(145, 0, 171, 0.55);
  color: #f4f4ff;
}

.app-controls-label {
  color: var(--color-text-muted);
}

.app-select {
  background: var(--color-background-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  box-shadow: inset 0 1px 3px rgba(17, 0, 126, 0.06);
}

.app-select:focus-visible {
  border-color: var(--color-primary);
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
}

.app-select-arrow {
  color: var(--color-text-muted);
}

.hero-panel {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: var(--shadow-strong);
  position: relative;
  overflow: hidden;
}

[data-theme='dark'] .hero-panel {
  background: transparent;
  border: 1px solid rgba(59, 72, 99, 0.32);
}

@media (min-width: 768px) {
}

@media (min-width: 1024px) {
  .hero-panel.hero-panel--wide {
    aspect-ratio: 16 / 9;
    min-height: 0;
  }

  .hero-panel .hero-content {
    min-height: 100%;
  }
}

.hero-glow {
  background: transparent;
  filter: blur(0);
  opacity: 0.85;
}

.hero-figure {
  background: transparent;
  border: 0;
  box-shadow: none;
}

.hero-content,
.hero-scrim,
.hero-glow {
  transition: opacity 280ms ease, transform 320ms ease;
}

.hero-panel .hero-content h1,
.hero-panel .hero-content .hero-subtext,
.hero-panel .hero-content .hero-note {
  color: rgba(255, 255, 255, 0.9);
  text-shadow: 0 8px 24px rgba(15, 21, 40, 0.18);
}

/* hero-text はレイアウト調整のためのフック。現状は追加の制約なし */
.hero-content .hero-text {
  margin: 0;
}

.hero-panel .hero-content .app-pill-link,
.hero-panel .hero-content .hero-badge {
  box-shadow: 0 12px 26px rgba(15, 21, 40, 0.12);
}

.dark .hero-panel .hero-content h1,
.dark .hero-panel .hero-content .hero-subtext,
.dark .hero-panel .hero-content .hero-note {
  color: rgba(236, 240, 255, 0.92);
  text-shadow: 0 10px 28px rgba(2, 6, 18, 0.35);
}

.hero-scrim {
  background: rgba(255, 255, 255, 0.1); /* 背景だけ軽く透過 */
  backdrop-filter: blur(64px) saturate(170%);
  opacity: 0.5; /* ヒーロのフロスト効果で暗くなる場合はここを調整する */
}

.hero-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: linear-gradient(140deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.02) 45%, transparent 100%);
  mix-blend-mode: screen;
}

.dark .hero-scrim {
  border-color: rgba(148, 163, 184, 0.32);
  background: rgba(7, 11, 26, 0.24);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    0 22px 52px rgba(0, 5, 18, 0.45);
  backdrop-filter: blur(32px) saturate(165%);
  -webkit-backdrop-filter: blur(32px) saturate(165%);
}

.dark .hero-panel::before {
  background: linear-gradient(140deg, rgba(3, 7, 18, 0.22) 0%, rgba(3, 7, 18, 0.12) 45%, transparent 100%);
  mix-blend-mode: normal;
  opacity: 0.85;
}

.hero-demo-button {
  transition: opacity 220ms ease, transform 280ms ease, background-color 220ms ease, color 220ms ease;
}

.hero-panel.demo-reveal {
  background: transparent;
}

[data-theme='dark'] .hero-panel.demo-reveal {
  background: transparent;
}

.hero-panel.demo-reveal .hero-content {
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px);
}

.hero-panel.demo-reveal .hero-scrim,
.hero-panel.demo-reveal .hero-glow {
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
}

.hero-panel.demo-reveal .hero-demo-button {
  background: rgba(17, 24, 39, 0.82);
  color: #f8f9ff;
}

[data-theme='dark'] .hero-panel.demo-reveal .hero-demo-button {
  background: rgba(244, 244, 255, 0.88);
  color: #0b1120;
}

.hero-panel.demo-reveal .hero-figure picture > img {
  transition-duration: 500ms;
}

.hero-subtext,
.hero-note {
  color: rgba(24, 22, 52, 0.78);
}

.dark .hero-subtext,
.dark .hero-note {
  color: rgba(228, 226, 255, 0.76);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 9999px;
  padding: 0.375rem 1.5rem;
  background: var(--color-background-alt);
  border: 1px solid var(--color-border);
  color: var(--color-primary);
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

[data-theme='dark'] .hero-badge {
  background: rgba(145, 0, 171, 0.18);
  border-color: rgba(145, 0, 171, 0.45);
  color: #f4f4ff;
}

.app-pill-link {
  border-radius: 9999px;
  background: var(--color-background-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.app-pill-link:hover {
  background: var(--color-overlay);
  border-color: rgba(145, 0, 171, 0.35);
  color: var(--color-primary);
  transform: translateY(-1px);
}

[data-theme='dark'] .app-pill-link {
  background: var(--color-background-alt);
  border-color: var(--color-border);
  color: var(--color-text);
}

[data-theme='dark'] .app-pill-link:hover {
  background: rgba(145, 0, 171, 0.2);
  border-color: rgba(145, 0, 171, 0.55);
  color: #ffffff;
}

.app-pill-link:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 3px;
}

.gumroad-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 13rem;
  padding: 0.875rem 1.75rem;
  border-radius: 9999px;
  background: var(--color-primary);
  color: #ffffff;
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: 0 14px 22px rgba(145, 0, 171, 0.22);
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.gumroad-button:hover {
  background: var(--color-primary-accent);
  box-shadow: 0 18px 32px rgba(17, 0, 126, 0.28);
  transform: translateY(-1px);
}

.gumroad-button:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 3px;
}

.itch-embed {
  display: block;
  max-width: 100%;
  border-radius: 1.5rem;
  border: none;
  box-shadow: 0 0 0 1.5px var(--color-embed-ring), var(--shadow-soft);
  overflow: hidden;
  transition: transform 160ms ease, box-shadow 160ms ease;
  background: var(--color-surface);
  background-clip: padding-box;
}

.itch-embed:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 0 1.5px var(--color-embed-ring), var(--shadow-strong);
}

.itch-embed-dark {
  display: none;
}

[data-theme='dark'] .itch-embed {
  background: var(--color-surface-subtle);
  box-shadow: 0 0 0 1.5px var(--color-embed-ring), var(--shadow-soft);
}

[data-theme='dark'] .itch-embed:hover {
  box-shadow: 0 0 0 1.5px var(--color-embed-ring), var(--shadow-strong);
}

[data-theme='dark'] .itch-embed-light {
  display: none;
}

[data-theme='dark'] .itch-embed-dark {
  display: block;
}

.section-surface {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
}

.card-surface {
  background: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  box-shadow: 0 14px 30px rgba(17, 0, 126, 0.08);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.card-surface:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 45px rgba(17, 0, 126, 0.14);
}

.card-surface .card-title {
  color: var(--color-text);
}

.card-surface .card-body {
  color: var(--color-text-muted);
}

.link-inline {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 4px;
  transition: color 160ms ease;
}

.link-inline:hover {
  color: var(--color-primary-accent);
}

.bullet-dot {
  background: var(--color-primary);
}

.muted {
  color: var(--color-text-muted);
}

.footer-bar {
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}

.footer-bar a {
  color: inherit;
}

.footer-bar a:hover {
  color: var(--color-primary);
}