@import url('https://fonts.googleapis.com/css2?family=Sora:wght@400;500;600;700&family=Noto+Sans+JP:wght@400;500;700&display=swap');

:root {
  --bg: #0b0c12;
  --bg-accent-1: rgba(104, 214, 255, 0.18);
  --bg-accent-2: rgba(255, 138, 214, 0.15);
  --surface: #131622;
  --surface-strong: #1b1f33;
  --text: #f8f8ff;
  --muted: #a9b2c8;
  --accent: #68d6ff;
  --accent-strong: #36b5ff;
  --accent-alt: #ff8ad6;
  --border: #232844;
  --divider: rgba(35, 40, 68, 0.6);
  --header-bg: rgba(11, 12, 18, 0.78);
  --panel-bg: linear-gradient(145deg, rgba(27, 31, 51, 0.92), rgba(19, 22, 34, 0.9));
  --panel-border: rgba(104, 214, 255, 0.2);
  --panel-shadow: var(--shadow);
  --notice-bg: rgba(255, 138, 214, 0.15);
  --notice-border: rgba(255, 138, 214, 0.4);
  --notice-text: #ffd8ef;
  --shadow: 0 12px 30px rgba(7, 10, 20, 0.45);
  --radius: 18px;
  --theme-toggle-bg: #151a26;
  --theme-toggle-ring: #2d364a;
  --theme-toggle-outline: rgba(255, 255, 255, 0.06);
  --theme-toggle-icon: #f6b13a;
  --theme-toggle-shadow: rgba(3, 6, 14, 0.55);
  --theme-toggle-focus: rgba(104, 214, 255, 0.35);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Sora', 'Noto Sans JP', system-ui, -apple-system, sans-serif;
  background: radial-gradient(circle at top, var(--bg-accent-1), transparent 50%),
    radial-gradient(circle at 20% 20%, var(--bg-accent-2), transparent 45%), var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

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

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

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(16px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--divider);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  gap: 20px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: none;
}

.nav-links {
  display: flex;
  gap: 18px;
  font-size: 14px;
  color: var(--muted);
  margin-left: auto;
}

.nav-links a {
  padding: 6px 12px;
  border-radius: 999px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-button {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 12px;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 10px;
  cursor: pointer;
}

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

.theme-toggle {
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: 999px;
  border: 2px solid var(--theme-toggle-ring);
  background: radial-gradient(circle at 35% 30%, rgba(255, 255, 255, 0.08), transparent 45%),
    var(--theme-toggle-bg);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6), 0 2px 6px var(--theme-toggle-shadow);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.theme-toggle:hover {
  background: radial-gradient(circle at 35% 30%, rgba(255, 255, 255, 0.08), transparent 45%),
    var(--theme-toggle-bg);
  border-color: var(--theme-toggle-ring);
  transform: translateY(-1px);
}

.theme-toggle:focus-visible {
  outline: none;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6), 0 0 0 4px var(--theme-toggle-focus),
    0 3px 8px var(--theme-toggle-shadow);
}

.theme-icon {
  width: 24px;
  height: 24px;
  color: var(--theme-toggle-icon);
}

.theme-icon circle {
  fill: currentColor;
}

.theme-icon line {
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
}

.theme-icon-moon {
  display: none;
}

.menu-overlay {
  position: fixed;
  inset: 0;
  background: var(--surface);
  color: var(--text);
  display: none;
  z-index: 20;
  overflow-y: auto;
}

.menu-overlay.is-open {
  display: block;
}

.menu-overlay-inner {
  min-height: 100vh;
  padding: 32px 0 48px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.menu-overlay-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.menu-title {
  font-size: 18px;
  font-weight: 600;
  text-transform: none;
  letter-spacing: 0.05em;
}

.menu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
}

.menu-section h3 {
  font-size: 16px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.menu-section ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
  color: var(--muted);
}

.menu-section a {
  color: var(--text);
}

.menu-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  padding-top: 24px;
  font-size: 13px;
  color: var(--muted);
}

.menu-footer-links {
  display: flex;
  gap: 16px;
}

body.menu-open {
  overflow: hidden;
}

.hero {
  padding: 80px 0 64px;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
  align-items: center;
}

.hero-card {
  background: var(--panel-bg);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--panel-shadow);
  border: 1px solid var(--panel-border);
}

.hero h1 {
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.2;
  margin-bottom: 18px;
}

.hero p {
  color: var(--muted);
  margin-bottom: 24px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.03em;
  background: rgba(104, 214, 255, 0.16);
  color: var(--accent);
}

.badge.alt {
  background: rgba(255, 138, 214, 0.18);
  color: var(--accent-alt);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 18px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 600;
  transition: 0.2s ease;
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-strong));
  color: #07101f;
}

.btn-primary:hover {
  transform: none;
  box-shadow: none;
}

.btn-ghost {
  border-color: rgba(104, 214, 255, 0.4);
  color: var(--text);
}

.btn-ghost:hover {
  background: transparent;
}

.section {
  padding: 56px 0;
}

.section-title {
  font-size: 20px;
  margin-bottom: 18px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.section-subtitle {
  color: var(--muted);
  margin-bottom: 32px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.card {
  background: var(--surface);
  border-radius: 16px;
  padding: 22px;
  border: 1px solid var(--border);
  box-shadow: 0 10px 20px rgba(8, 12, 22, 0.35);
  transition: 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(104, 214, 255, 0.4);
}

.card h3 {
  font-size: 16px;
  margin-bottom: 10px;
}

.guideline-text h3 {
  font-size: 16px;
  margin: 1em 0;
}

.guideline-text p {
  color: var(--muted);
  font-size: 14px;
}

.card p {
  color: var(--muted);
  font-size: 14px;
}

.split {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.notice {
  background: var(--notice-bg);
  border: 1px solid var(--notice-border);
  padding: 18px 20px;
  border-radius: 14px;
  color: var(--notice-text);
  font-size: 14px;
}

.breadcrumb {
  font-size: 13px;
  color: var(--muted);
  margin: 26px 0 12px;
}

.breadcrumb a {
  color: var(--accent);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.table td {
  padding: 12px 10px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
}

.table td strong {
  color: var(--text);
}

.site-footer {
  border-top: 1px solid var(--divider);
  padding: 32px 0 40px;
  color: var(--muted);
  font-size: 13px;
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
}

.footer-links {
  display: flex;
  gap: 16px;
}

.fade-in {
  animation: fade-in 0.6s ease both;
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.age-gate {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(5, 8, 16, 0.82);
  z-index: 999;
  padding: 24px;
}

.age-gate.is-open {
  display: flex;
}

.age-gate-card {
  width: min(520px, 100%);
  background: var(--panel-bg);
  border-radius: 20px;
  border: 1px solid var(--notice-border);
  box-shadow: var(--panel-shadow);
  padding: 28px;
  text-align: center;
}

.age-gate-card h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.age-gate-card p {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 20px;
}

.age-gate-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.age-gate-actions .btn-ghost {
  border-color: rgba(255, 138, 214, 0.5);
}

@media (max-width: 720px) {
  .nav-links {
    display: none;
  }

  .hero {
    padding-top: 56px;
  }

  .menu-overlay-inner {
    padding-top: 24px;
  }

  .menu-grid {
    grid-template-columns: 1fr;
  }
}

[data-theme='light'] {
  --bg: #f4f6fb;
  --bg-accent-1: rgba(104, 214, 255, 0.2);
  --bg-accent-2: rgba(255, 138, 214, 0.18);
  --surface: #ffffff;
  --surface-strong: #eef2ff;
  --text: #1d2333;
  --muted: #4b5568;
  --accent: #2f7dd7;
  --accent-strong: #1e5aa2;
  --accent-alt: #d3428f;
  --border: #dbe3f1;
  --divider: #dbe3f1;
  --header-bg: rgba(246, 248, 255, 0.9);
  --panel-bg: linear-gradient(155deg, rgba(255, 255, 255, 0.98), rgba(243, 246, 255, 0.95));
  --panel-border: rgba(47, 125, 215, 0.2);
  --panel-shadow: 0 14px 28px rgba(30, 41, 59, 0.12);
  --notice-bg: rgba(211, 66, 143, 0.12);
  --notice-border: rgba(211, 66, 143, 0.35);
  --notice-text: #6a1b4d;
  --shadow: 0 12px 26px rgba(25, 30, 50, 0.12);
  --theme-toggle-bg: #f4f7ff;
  --theme-toggle-ring: #c8d4ea;
  --theme-toggle-icon: #f2a73a;
  --theme-toggle-shadow: rgba(30, 41, 59, 0.12);
  --theme-toggle-focus: rgba(47, 125, 215, 0.32);
}

[data-theme='dark'] .theme-icon {
  display: none;
}

[data-theme='dark'] .theme-icon-moon {
  display: inline;
}