:root {
  color-scheme: dark;
  --bg: #091224;
  --surface: #111d34;
  --surface-soft: #152541;
  --text: #e8efff;
  --text-soft: #b2c0df;
  --accent: #4f8dff;
  --accent-dark: #86b2ff;
  --border: #24385f;
  --shadow: 0 14px 30px rgba(0, 0, 0, 0.35);
  --header-bg: rgba(9, 18, 36, 0.9);
  --section-alt-bg: rgba(17, 29, 52, 0.6);
  --qr-bg: #0d1930;
  --disabled-bg: #263958;
  --disabled-text: #9aaed4;
  --disabled-border: #314972;
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Segoe UI", "Avenir Next", "Trebuchet MS", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1000px 420px at 95% -8%, #14356d 0%, transparent 55%),
    linear-gradient(180deg, #0b1630 0%, var(--bg) 100%);
  line-height: 1.6;
}

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

a {
  color: var(--accent-dark);
}

a:hover,
a:focus-visible {
  color: var(--accent);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  width: auto;
  height: auto;
  padding: 0.5rem 0.75rem;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  z-index: 9999;
}

.container {
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(8px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.header-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text);
}

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-soft);
  object-fit: contain;
  padding: 0.2rem;
}

.brand-name {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin: 0;
  padding: 0;
  list-style: none;
  flex-wrap: wrap;
}

.nav-list a {
  display: inline-block;
  text-decoration: none;
  color: var(--text-soft);
  font-weight: 600;
  padding: 0.4rem 0.65rem;
  border-radius: 999px;
}

.nav-list a[aria-current="page"] {
  background: var(--surface-soft);
  color: var(--accent-dark);
}

.hero {
  padding: 2.25rem 0 1.25rem;
}

.hero-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1.1rem;
  padding: 2rem 1.2rem;
  box-shadow: var(--shadow);
  text-align: center;
}

.hero-logo {
  width: 78px;
  height: 78px;
  margin: 0 auto 0.8rem;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--surface-soft);
  object-fit: contain;
  padding: 0.35rem;
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin-top: 0;
}

h1 {
  font-size: clamp(2rem, 5vw, 2.8rem);
  margin-bottom: 0.4rem;
}

h2 {
  font-size: clamp(1.45rem, 4vw, 1.95rem);
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.12rem;
  margin-bottom: 0.5rem;
}

.tagline {
  font-size: clamp(1.05rem, 2.8vw, 1.25rem);
  color: var(--accent-dark);
  margin: 0.2rem 0 0.6rem;
  font-weight: 600;
}

.hero-text {
  max-width: 680px;
  margin: 0 auto;
  color: var(--text-soft);
}

.button-row {
  margin-top: 1.2rem;
  display: flex;
  justify-content: center;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.btn {
  border-radius: 999px;
  padding: 0.64rem 1.05rem;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid transparent;
}

.btn-primary {
  color: #ffffff;
  background: var(--accent);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--accent-dark);
  color: #ffffff;
}

.btn-secondary {
  background: var(--surface);
  color: var(--accent-dark);
  border-color: var(--border);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background: var(--surface-soft);
}

.btn-small {
  padding: 0.48rem 0.86rem;
  font-size: 0.92rem;
}

.section {
  padding: 1.25rem 0 2rem;
}

.section-alt {
  background: var(--section-alt-bg);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.card-grid {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: 1fr;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.95rem;
  padding: 1rem;
  box-shadow: var(--shadow);
}

.card p {
  margin-bottom: 0;
  color: var(--text-soft);
}

.store-grid {
  display: grid;
  gap: 0.95rem;
  grid-template-columns: 1fr;
}

.hero-store-wrap {
  margin-top: 1.35rem;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

.hero-store-title {
  font-size: 1.05rem;
  margin-bottom: 0.8rem;
  color: var(--text-soft);
}

.hero-store-grid .store-card {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  text-align: center;
  padding: 0.9rem;
  min-height: 304px;
}

.store-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.95rem;
  padding: 1rem;
  box-shadow: var(--shadow);
}

.store-card p {
  margin: 0.35rem 0;
  color: var(--text-soft);
}

.btn-disabled {
  display: inline-block;
  background: var(--disabled-bg);
  color: var(--disabled-text);
  border-color: var(--disabled-border);
  cursor: not-allowed;
}

.qr-figure {
  margin: 0.8rem 0 0;
}

.qr-code {
  width: 104px;
  height: 104px;
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  background: transparent;
  filter: brightness(0) invert(1);
  margin: 0 auto;
}

.qr-figure figcaption {
  margin-top: 0.45rem;
  font-size: 0.85rem;
  color: var(--text-soft);
}

.store-note {
  font-size: 0.93rem;
}

.screenshot-grid {
  display: grid;
  gap: 0.95rem;
  grid-template-columns: 1fr;
}

.screenshot-card {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.95rem;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.screenshot-card img {
  width: 100%;
  aspect-ratio: 9 / 19;
  object-fit: cover;
  background: linear-gradient(180deg, #f8fbff 0%, #e6f0ff 100%);
}

.screenshot-card figcaption {
  padding: 0.6rem 0.8rem 0.75rem;
  font-weight: 600;
  color: var(--text-soft);
}

.legal-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1.05rem;
  box-shadow: var(--shadow);
  padding: 1.4rem 1.05rem;
}

.legal-content p,
.legal-content li {
  color: var(--text-soft);
}

.legal-content ul {
  padding-left: 1.1rem;
}

.site-footer {
  padding: 1.5rem 0 2rem;
}

.footer-wrap {
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

.footer-wrap p {
  margin: 0.3rem 0;
}

.footer-links {
  list-style: none;
  margin: 0.5rem 0;
  padding: 0;
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.footer-links a {
  text-decoration: none;
  font-weight: 600;
}

@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;
    --bg: #f4f8ff;
    --surface: #ffffff;
    --surface-soft: #eef4ff;
    --text: #12213d;
    --text-soft: #3b4c72;
    --accent: #1f64ff;
    --accent-dark: #184fd1;
    --border: #d5e2ff;
    --shadow: 0 12px 28px rgba(18, 33, 61, 0.08);
    --header-bg: rgba(249, 251, 255, 0.92);
    --section-alt-bg: rgba(255, 255, 255, 0.7);
    --qr-bg: #ffffff;
    --disabled-bg: #e9edf7;
    --disabled-text: #5f6f94;
    --disabled-border: #d6dfef;
  }

  body {
    background:
      radial-gradient(1000px 420px at 95% -8%, #d8e6ff 0%, transparent 55%),
      linear-gradient(180deg, #f9fbff 0%, var(--bg) 100%);
  }

  .qr-code {
    filter: none;
  }
}

@media (min-width: 740px) {
  .hero {
    padding-top: 3rem;
  }

  .hero-card {
    padding: 2.6rem 2rem;
  }

  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .store-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .screenshot-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .legal-content {
    padding: 1.8rem;
  }
}

@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 739px) {
  .header-wrap {
    align-items: flex-start;
  }

  .site-header nav {
    width: 100%;
  }

  .nav-list {
    width: 100%;
    justify-content: flex-start;
    gap: 0.5rem;
  }

  .nav-list a {
    font-size: 0.95rem;
    padding: 0.34rem 0.55rem;
  }

  .hero-card {
    padding: 1.5rem 0.95rem;
  }

  .button-row .btn {
    width: 100%;
    max-width: 320px;
    text-align: center;
  }

  .hero-store-grid .store-card {
    min-height: 0;
    padding: 0.85rem;
  }
}

@media (min-width: 560px) and (max-width: 739px) {
  .screenshot-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}