:root {
  --forest: #063f31;
  --forest-deep: #032f26;
  --mint: #dceedd;
  --cream: #f7f1d5;
  --sun: #f2c552;
  --paper: #fbfbf6;
  --ink: #123c31;
  --muted: #60756d;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.hero {
  position: relative;
  min-height: 820px;
  overflow: hidden;
  color: white;
  background:
    radial-gradient(circle at 77% 34%, rgba(250, 223, 129, .3), transparent 18rem),
    radial-gradient(circle at 82% 74%, rgba(91, 175, 127, .25), transparent 25rem),
    linear-gradient(145deg, #0d5a43 0%, var(--forest) 42%, var(--forest-deep) 100%);
}

.hero::before,
.hero::after {
  position: absolute;
  width: 540px;
  height: 540px;
  border: 1px solid rgba(255, 255, 255, .09);
  border-radius: 50%;
  content: "";
}

.hero::before { top: -220px; right: -130px; }
.hero::after { right: 7%; bottom: -330px; }

.nav,
.hero-content,
.feature-section,
.support-section,
.site-footer {
  width: min(1120px, calc(100% - 40px));
  margin-inline: auto;
}

.nav {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 28px;
}

.brand {
  display: inline-flex;
  gap: 11px;
  align-items: center;
  font-weight: 800;
  letter-spacing: .04em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  color: var(--forest);
  font-family: Georgia, serif;
  font-size: 20px;
  font-weight: 700;
  background: var(--sun);
  border-radius: 50%;
}

.nav-link {
  padding: 9px 15px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, .35);
  border-radius: 999px;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-top: 150px;
}

.eyebrow,
.section-label {
  margin: 0 0 18px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .22em;
}

.eyebrow { color: #c6e7cf; }

h1 {
  max-width: 770px;
  margin: 0;
  font-size: clamp(52px, 8vw, 92px);
  line-height: 1.08;
  letter-spacing: -.045em;
}

.lead {
  max-width: 610px;
  margin: 30px 0 0;
  color: rgba(255, 255, 255, .78);
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  font-weight: 800;
  text-decoration: none;
  border-radius: 15px;
}

.primary-button { color: var(--forest-deep); background: var(--sun); }
.secondary-button { color: white; border: 1px solid rgba(255, 255, 255, .32); }

.sound-card {
  position: absolute;
  z-index: 1;
  right: max(20px, calc((100vw - 1120px) / 2));
  bottom: 62px;
  width: min(400px, calc(100% - 40px));
  padding: 24px;
  color: var(--ink);
  background: rgba(250, 251, 240, .93);
  border: 1px solid rgba(255, 255, 255, .75);
  border-radius: 25px;
  box-shadow: 0 28px 70px rgba(0, 26, 20, .3);
}

.sound-card-top {
  display: flex;
  align-items: end;
  justify-content: space-between;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(18, 60, 49, .12);
}

.sound-card-top span,
.plan-title span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .08em;
}

.sound-card-top strong {
  color: var(--forest);
  font-family: Georgia, serif;
  font-size: 46px;
  line-height: .8;
}

.cicada-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 18px;
  padding-top: 20px;
}

.cicada-list span {
  display: flex;
  gap: 9px;
  align-items: center;
  font-size: 14px;
  font-weight: 750;
}

.cicada-list i {
  width: 10px;
  height: 10px;
  background: var(--sun);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(242, 197, 82, .16);
}

.feature-section,
.support-section { padding-block: 110px; }
.section-label { color: #3f7a62; }

h2 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(34px, 4.2vw, 52px);
  line-height: 1.24;
  letter-spacing: -.035em;
}

.plans {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  margin-top: 54px;
}

.plan-card {
  position: relative;
  padding: 34px;
  background: white;
  border: 1px solid #dfe8e1;
  border-radius: 25px;
  box-shadow: 0 16px 48px rgba(30, 72, 55, .07);
}

.pro-card { color: white; background: linear-gradient(150deg, #176548, #084332); border-color: transparent; }

.pro-badge {
  position: absolute;
  top: 22px;
  right: 22px;
  padding: 7px 11px;
  color: #553b00;
  font-size: 12px;
  font-weight: 850;
  background: var(--sun);
  border-radius: 999px;
}

.plan-title { display: flex; flex-direction: column; gap: 3px; }
.pro-card .plan-title span { color: #b9dac7; }
.plan-title strong { font-family: Georgia, serif; font-size: 46px; }

.plan-card ul {
  display: grid;
  gap: 14px;
  padding: 22px 0 0;
  margin: 22px 0 0;
  list-style: none;
  border-top: 1px solid rgba(18, 60, 49, .13);
}

.plan-card li::before {
  display: inline-grid;
  width: 22px;
  height: 22px;
  margin-right: 10px;
  place-items: center;
  color: var(--forest);
  font-size: 12px;
  font-weight: 900;
  background: var(--mint);
  border-radius: 50%;
  content: "✓";
}

.support-section {
  width: min(960px, calc(100% - 40px));
  padding-top: 80px;
  border-top: 1px solid #dbe5dd;
}

.faq-list { margin-top: 45px; border-top: 1px solid #dbe5dd; }
details { border-bottom: 1px solid #dbe5dd; }

summary {
  position: relative;
  padding: 24px 44px 24px 0;
  font-size: 18px;
  font-weight: 800;
  cursor: pointer;
  list-style: none;
}

summary::-webkit-details-marker { display: none; }
summary::after {
  position: absolute;
  top: 20px;
  right: 0;
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  color: var(--forest);
  background: var(--mint);
  border-radius: 50%;
  content: "+";
}
details[open] summary::after { content: "−"; }
details p { max-width: 720px; padding: 0 40px 24px 0; margin: 0; color: var(--muted); line-height: 1.9; }

.support-note {
  padding: 26px 28px;
  margin-top: 40px;
  background: var(--cream);
  border-radius: 20px;
}

.support-note p { margin: 3px 0 0; color: #5f664b; line-height: 1.7; }
.support-note-title { color: var(--ink) !important; font-weight: 850; }

.site-footer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: end;
  padding-block: 50px;
  border-top: 1px solid #dbe5dd;
}

.site-footer div:first-child { display: flex; flex-direction: column; gap: 6px; }
.site-footer span, .site-footer p { color: var(--muted); font-size: 13px; }
.footer-links { display: flex; gap: 20px; align-self: start; font-size: 13px; font-weight: 750; }
.site-footer p { grid-column: 1 / -1; margin: 10px 0 0; }

.policy-shell {
  min-height: 100vh;
  padding: 28px 20px 60px;
  background:
    radial-gradient(circle at 12% 0%, rgba(242, 197, 82, .24), transparent 30rem),
    linear-gradient(150deg, #eef6e8, #f9f7e9 58%, #eef5ef);
}

.policy-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(840px, 100%);
  margin: 0 auto 24px;
}

.policy-nav .brand { color: var(--forest); }
.policy-nav > a:last-child { color: #356b57; font-size: 13px; font-weight: 750; }

.policy-card {
  width: min(840px, 100%);
  padding: clamp(28px, 7vw, 66px);
  margin: 0 auto;
  background: rgba(255, 255, 255, .93);
  border: 1px solid white;
  border-radius: 28px;
  box-shadow: 0 24px 80px rgba(31, 75, 57, .12);
}

.policy-card h1 { color: var(--ink); font-size: clamp(36px, 7vw, 60px); }
.policy-card .updated { margin: 15px 0 40px; color: var(--muted); font-size: 13px; }
.policy-card h2 { margin: 42px 0 12px; font-size: 21px; letter-spacing: -.01em; }
.policy-card p, .policy-card li { color: #4c6259; line-height: 1.95; }
.policy-card a { color: #0d684a; font-weight: 750; }
.policy-card ul { padding-left: 22px; }
.policy-footer { width: min(840px, 100%); padding: 28px 0 0; margin: 0 auto; color: var(--muted); font-size: 12px; }
.support-page .faq-list { margin-top: 28px; }

@media (max-width: 760px) {
  .hero { min-height: 950px; }
  .hero-content { padding-top: 108px; }
  .sound-card { right: 20px; bottom: 44px; }
  .plans { grid-template-columns: 1fr; }
  .site-footer { display: flex; flex-direction: column; align-items: flex-start; }
}