:root {
  color-scheme: light dark;
  --bg: #f3f5ff;
  --bg-secondary: #eeeafd;
  --card: rgba(255, 255, 255, 0.88);
  --card-solid: #ffffff;
  --text: #15182b;
  --muted: #5f647b;
  --accent: #246bfe;
  --accent-secondary: #7b35dc;
  --border: rgba(52, 55, 92, 0.1);
  --shadow: 0 18px 48px rgba(41, 46, 105, 0.1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1020;
    --bg-secondary: #17122a;
    --card: rgba(24, 28, 52, 0.88);
    --card-solid: #181c34;
    --text: #f4f5ff;
    --muted: #a9aec7;
    --accent: #70a0ff;
    --accent-secondary: #b78aff;
    --border: rgba(255, 255, 255, 0.1);
    --shadow: 0 18px 48px rgba(0, 0, 0, 0.24);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 5%, rgba(36, 107, 254, 0.18), transparent 30rem),
    radial-gradient(circle at 92% 20%, rgba(123, 53, 220, 0.16), transparent 28rem),
    linear-gradient(150deg, var(--bg), var(--bg-secondary));
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  line-height: 1.65;
}

a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

main {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 64px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 18px;
  font-weight: 750;
  letter-spacing: -0.02em;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 10px;
  color: white;
  background: linear-gradient(135deg, #246bfe, #8e3de3);
  box-shadow: 0 8px 18px rgba(62, 80, 214, 0.28);
  font-size: 17px;
}

.language-toggle {
  display: flex;
  gap: 5px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  backdrop-filter: blur(18px);
}

.language-toggle button {
  appearance: none;
  min-width: 76px;
  padding: 8px 13px;
  border: 0;
  border-radius: 999px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  font-weight: 650;
}

.language-toggle button.active {
  color: white;
  background: linear-gradient(120deg, var(--accent), var(--accent-secondary));
  box-shadow: 0 5px 14px rgba(65, 75, 196, 0.22);
}

.lang-pane.hidden {
  display: none;
}

.hero,
.card {
  border: 1px solid var(--border);
  background: var(--card);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(32px, 6vw, 58px);
  border-radius: 30px;
  margin-bottom: 20px;
}

.hero::after {
  position: absolute;
  top: -110px;
  right: -90px;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: linear-gradient(145deg, rgba(36, 107, 254, 0.24), rgba(142, 61, 227, 0.2));
  content: "";
  filter: blur(4px);
  pointer-events: none;
}

.eyebrow {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 11px;
  margin-bottom: 15px;
  border-radius: 999px;
  color: var(--accent);
  background: rgba(65, 105, 225, 0.1);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

h1,
h2 {
  line-height: 1.18;
  letter-spacing: -0.035em;
}

h1 {
  position: relative;
  z-index: 1;
  max-width: 680px;
  margin: 0 0 14px;
  font-size: clamp(36px, 7vw, 60px);
}

h2 {
  margin: 0 0 12px;
  font-size: 23px;
}

h3 {
  margin: 22px 0 8px;
  font-size: 17px;
}

p {
  margin: 0 0 14px;
}

.hero p {
  position: relative;
  z-index: 1;
  max-width: 680px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 18px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 18px;
}

.card {
  padding: 26px;
  border-radius: 22px;
  margin-bottom: 18px;
}

.grid .card {
  margin-bottom: 0;
}

.card-icon {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  margin-bottom: 16px;
  border-radius: 13px;
  color: white;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  font-size: 20px;
  box-shadow: 0 8px 18px rgba(67, 78, 194, 0.2);
}

ul,
ol {
  padding-left: 21px;
  margin: 0;
}

li + li {
  margin-top: 9px;
}

.faq {
  display: grid;
  gap: 12px;
}

.faq details {
  padding: 15px 17px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(127, 127, 127, 0.045);
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
}

.faq details p {
  margin: 10px 0 0;
  color: var(--muted);
}

.notice {
  padding: 15px 17px;
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  color: var(--muted);
  background: rgba(65, 105, 225, 0.08);
}

.page-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 28px;
  padding: 0 4px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 640px) {
  main {
    width: min(100% - 22px, 920px);
    padding-top: 18px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .language-toggle {
    align-self: stretch;
  }

  .language-toggle button {
    flex: 1;
  }

  .hero {
    padding: 30px 23px;
    border-radius: 24px;
  }

  .hero p {
    font-size: 16px;
  }

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

  .card {
    padding: 22px;
  }

  .footer {
    flex-direction: column;
  }
}

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