:root {
  --navy: #050f26;
  --navy-deep: #000d23;
  --cyan: #00d4ff;
  --cyan-soft: rgba(0, 212, 255, 0.18);
  --text: #ffffff;
  --muted: rgba(255, 255, 255, 0.72);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  background:
    linear-gradient(rgba(0, 212, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.025) 1px, transparent 1px),
    linear-gradient(180deg, #020b1a 0%, var(--navy-deep) 45%, #020814 100%);
  background-size: 24px 24px, 24px 24px, auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  padding: 15px 20px;
  border-bottom: 1px solid var(--cyan-soft);
  background: rgba(2, 11, 26, 0.88);
  backdrop-filter: blur(12px);
}

.brand {
  display: block;
  width: fit-content;
  margin: 0 auto;
  color: #fff;
  font-size: 0.98rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.brand span {
  color: var(--cyan);
}

.policy-wrap {
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 34px 18px 48px;
}

.policy-card {
  padding: 38px 44px 42px;
  border: 1px solid rgba(0, 212, 255, 0.24);
  border-radius: 16px;
  background: rgba(5, 20, 45, 0.72);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(8px);
}

.title-block {
  padding-bottom: 28px;
  border-bottom: 1px solid var(--cyan-soft);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--cyan);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

h1 {
  margin: 0 0 18px;
  font-size: clamp(1.65rem, 4vw, 2.2rem);
  line-height: 1.35;
}

.lead {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.9;
}

section {
  padding-top: 28px;
}

h2 {
  margin: 0 0 13px;
  padding-left: 12px;
  border-left: 3px solid var(--cyan);
  font-size: 1.08rem;
  line-height: 1.55;
}

p,
li {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.86rem;
  line-height: 1.9;
}

p {
  margin: 0 0 12px;
}

ul {
  margin: 10px 0 14px;
  padding-left: 1.4em;
}

li + li {
  margin-top: 6px;
}

a {
  color: #70dcff;
  text-underline-offset: 3px;
}

a:hover {
  color: #bcefff;
}

a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: 3px;
}

.effective-date {
  margin: 32px 0 0;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.78rem;
  text-align: right;
}

.back-area {
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--cyan-soft);
  text-align: center;
}

.back-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 30px;
  border: 1px solid rgba(0, 212, 255, 0.65);
  border-radius: 999px;
  color: #fff;
  font-size: 0.88rem;
  font-weight: 700;
  text-decoration: none;
  background: rgba(0, 212, 255, 0.1);
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.back-button::before {
  content: "←";
  margin-right: 9px;
}

.back-button:hover {
  color: #fff;
  background: rgba(0, 212, 255, 0.2);
  transform: translateY(-1px);
}

footer {
  padding: 0 18px 32px;
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.7rem;
  text-align: center;
}

@media (max-width: 600px) {
  .policy-wrap {
    padding: 20px 12px 36px;
  }

  .policy-card {
    padding: 28px 18px 32px;
    border-radius: 13px;
  }

  .title-block {
    padding-bottom: 22px;
  }

  section {
    padding-top: 24px;
  }

  p,
  li {
    font-size: 0.82rem;
    line-height: 1.85;
  }
}

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

  .back-button {
    transition: none;
  }
}