:root {
  color-scheme: light;
  --page: #dceaf2;
  --page-deep: #cbdde8;
  --surface: #f7fbfd;
  --surface-strong: #ffffff;
  --ink: #102733;
  --muted: #5d7480;
  --line: rgba(39, 79, 99, 0.16);
  --blue: #0c84d8;
  --blue-deep: #086aa9;
  --night: #0e171d;
  --night-surface: #17242c;
  --shadow: 0 24px 60px rgba(27, 73, 95, 0.16);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
  color: var(--ink);
  background: var(--page);
}

a { color: var(--blue-deep); text-decoration: none; }
a:hover { text-decoration: underline; }

button,
a { -webkit-tap-highlight-color: transparent; }

header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(247, 251, 253, 0.86);
  backdrop-filter: blur(18px);
}

.nav,
.page-width,
.footer-inner {
  width: min(1100px, calc(100% - 36px));
  margin: 0 auto;
}

.nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 900;
  letter-spacing: -0.02em;
}

.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
  padding: 7px;
  border-radius: 10px;
  background: var(--night);
  box-shadow: 0 6px 14px rgba(14, 23, 29, 0.2);
}

.brand-mark i {
  display: block;
  border-radius: 2px;
  background: #eff7fb;
}

.brand-mark i:last-child { background: var(--blue); }

.nav-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}

.link-button,
.lang-button {
  min-height: 38px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}

.lang-button[aria-pressed="true"] {
  border-color: var(--blue);
  background: var(--blue);
  color: #fff;
  font-weight: 800;
}

.hero {
  min-height: calc(100vh - 68px);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(350px, 0.95fr);
  align-items: center;
  gap: clamp(36px, 7vw, 90px);
  padding: 70px 0 76px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--blue-deep);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

h1,
h2,
h3 { letter-spacing: -0.035em; }

h1 {
  margin: 0;
  max-width: 650px;
  font-size: clamp(42px, 7vw, 76px);
  line-height: 1.08;
}

.accent { color: var(--blue-deep); }

.lead {
  max-width: 620px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 20px);
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.hero-points li {
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.62);
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 32px;
}

.primary-link,
.secondary-link {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 19px;
  border-radius: 14px;
  font-weight: 800;
}

.primary-link {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 12px 24px rgba(12, 132, 216, 0.22);
}

.secondary-link {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
}

.primary-link:hover,
.secondary-link:hover { text-decoration: none; transform: translateY(-1px); }

.device-stage {
  position: relative;
  min-height: 630px;
  display: grid;
  place-items: center;
}

.stage-disc {
  position: absolute;
  width: min(100%, 470px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--blue);
  opacity: 0.95;
}

.phone {
  position: relative;
  width: min(330px, 85vw);
  padding: 28px 20px 22px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 42px;
  background: var(--night);
  box-shadow: 0 34px 70px rgba(9, 35, 48, 0.32);
  transform: rotate(2deg);
}

.phone::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 50%;
  width: 84px;
  height: 6px;
  border-radius: 999px;
  background: #28353d;
  transform: translateX(-50%);
}

.mode-switch {
  width: fit-content;
  display: flex;
  gap: 4px;
  margin: 6px auto 28px;
  padding: 4px;
  border-radius: 12px;
  background: #1c2a33;
  color: #8fa2ad;
  font-size: 13px;
}

.mode-switch span { padding: 4px 10px; }
.mode-switch span:last-child { border-radius: 8px; background: #2b3a43; color: #fff; }

.calculator-display {
  min-height: 92px;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: 0 4px 18px;
  color: #f4f8fa;
  font-size: 47px;
  line-height: 1;
  letter-spacing: -0.04em;
}

.keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.key {
  aspect-ratio: 1.2;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: #1c2931;
  color: #f5f9fb;
  font-size: 21px;
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.13);
}

.key.action { background: #203743; color: #b8d9e9; }
.key.operation { background: #0b344b; color: #89d4ff; }
.key.equals { background: var(--blue); color: #fff; }
.key.wide { grid-column: span 2; aspect-ratio: auto; }

.vault-peek {
  position: absolute;
  right: -38px;
  bottom: 54px;
  width: 190px;
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 24px;
  background: rgba(247, 251, 253, 0.9);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.vault-peek strong { display: block; font-size: 14px; }

.mini-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  margin: 12px 0;
  color: var(--muted);
  font-size: 9px;
  text-align: center;
}

.mini-tabs span:first-child { color: var(--blue-deep); font-weight: 800; }

.mini-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
}

.mini-grid i {
  aspect-ratio: 1;
  border-radius: 7px;
  background: var(--page-deep);
}

.mini-grid i:nth-child(2),
.mini-grid i:nth-child(5) { background: #94bed4; }
.mini-grid i:nth-child(3),
.mini-grid i:nth-child(4) { background: #d8c5ac; }

.section { padding: 86px 0; }
.section.surface { background: var(--surface); }

.section-head { max-width: 720px; margin-bottom: 36px; }

.section-head h2,
.support h2 {
  margin: 0;
  font-size: clamp(32px, 5vw, 50px);
  line-height: 1.14;
}

.section-head > p:last-child,
.support p { color: var(--muted); }

.features {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.feature {
  min-height: 235px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.72);
}

.feature-number {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  background: #d9eef9;
  color: var(--blue-deep);
  font-weight: 900;
}

.feature h3 { margin: 20px 0 8px; font-size: 21px; }
.feature p { margin: 0; color: var(--muted); font-size: 15px; }

.privacy-note {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 36px;
  padding: clamp(30px, 6vw, 58px);
  border-radius: 30px;
  background: var(--night);
  color: #edf5f8;
  box-shadow: var(--shadow);
}

.privacy-note h2 { margin: 0; font-size: clamp(30px, 5vw, 48px); line-height: 1.15; }
.privacy-note p { margin: 0; color: #b8c8d0; }
.privacy-note .secondary-link { margin-top: 22px; color: #fff; border-color: #3c4b54; background: #1a2830; }

.support {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  padding: clamp(30px, 6vw, 58px);
  border: 1px solid var(--line);
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.58);
}

footer {
  border-top: 1px solid var(--line);
  padding: 25px 0;
  background: var(--surface);
  color: var(--muted);
  font-size: 14px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.policy-wrap {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 56px 0 80px;
}

.policy {
  padding: clamp(26px, 6vw, 58px);
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--surface);
  box-shadow: 0 18px 48px rgba(27, 73, 95, 0.1);
}

.policy h1 { font-size: clamp(37px, 6vw, 58px); }
.policy h2 { margin: 38px 0 10px; font-size: 22px; }
.policy p,
.policy li { color: var(--muted); }
.policy ul { padding-left: 22px; }
.updated { margin: 12px 0 34px; color: var(--muted); }
.note { padding: 14px 17px; border-left: 4px solid var(--blue); border-radius: 7px; background: #e7f4fb; color: var(--ink) !important; }

[data-lang] { display: none; }
html[data-active-lang="ja"] [data-lang="ja"],
html[data-active-lang="en"] [data-lang="en"] { display: block; }
html[data-active-lang="ja"] .inline[data-lang="ja"],
html[data-active-lang="en"] .inline[data-lang="en"] { display: inline; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 54px; }
  .hero > div:first-child { text-align: center; }
  .hero .lead { margin-left: auto; margin-right: auto; }
  .hero-points, .cta-row { justify-content: center; }
  .device-stage { min-height: 580px; }
  .features { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .privacy-note { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .nav { align-items: flex-start; padding: 12px 0; }
  .brand span:last-child { display: none; }
  .nav-actions { gap: 5px; }
  .link-button, .lang-button { min-height: 34px; padding: 5px 9px; font-size: 12px; }
  .hero { min-height: auto; padding-bottom: 44px; }
  .device-stage { min-height: 520px; }
  .phone { width: 280px; padding: 28px 16px 20px; }
  .calculator-display { min-height: 76px; font-size: 39px; }
  .keypad { gap: 8px; }
  .key { border-radius: 12px; font-size: 18px; }
  .vault-peek { right: -8px; bottom: 12px; width: 160px; }
  .features { grid-template-columns: 1fr; }
  .feature { min-height: auto; }
  .support { align-items: flex-start; flex-direction: column; }
  .section { padding: 62px 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .primary-link:hover, .secondary-link:hover { transform: none; }
}