:root {
  color-scheme: light dark;
  --bg: #f5f8fa;
  --surface: #ffffff;
  --ink: #0d1b2a;
  --muted: #4a5d6e;
  --line: #d1dce5;
  --cyan: #008891;
  --cyan-bright: #00adb5;
  --emerald: #0f9d58;
  --amber: #f39c12;
  --coral: #e74c3c;
  --focus: #0066cc;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: radial-gradient(circle at 90% -10%, #d4f4f7 0, transparent 35rem), var(--bg);
  color: var(--ink);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--cyan-bright);
}

a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.wrap {
  width: min(100% - 32px, 940px);
  margin: auto;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.03em;
  color: var(--ink);
  text-decoration: none;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
}

.nav a {
  font-size: 0.94rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--muted);
}

.nav a:hover,
.nav a.active {
  color: var(--cyan);
}

.lang-switch {
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 700;
  text-decoration: none;
}

.hero {
  padding: 80px 0 48px;
}

.eyebrow {
  color: var(--cyan);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.hero h1 {
  max-width: 760px;
  margin: 0.4rem 0 1.2rem;
  font-size: clamp(2.4rem, 8vw, 4.5rem);
  line-height: 1.02;
  letter-spacing: -0.055em;
}

.lead {
  max-width: 680px;
  color: var(--muted);
  font-size: 1.18rem;
  line-height: 1.6;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border: 1px solid var(--cyan);
  border-radius: 999px;
  background: var(--cyan);
  color: white;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.15s ease, background-color 0.15s ease;
}

.button:hover {
  background: var(--cyan-bright);
  color: #0d1b2a;
  transform: translateY(-1px);
}

.button.secondary {
  background: transparent;
  color: var(--cyan);
}

.button.secondary:hover {
  background: color-mix(in srgb, var(--cyan) 12%, transparent);
  color: var(--cyan);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  padding-bottom: 72px;
}

.card {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: 0 10px 30px rgba(0, 136, 145, 0.05);
}

.card h2 {
  margin-top: 0;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

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

.content {
  padding: 48px 0 80px;
  max-width: 780px;
}

.content h1 {
  font-size: clamp(2.2rem, 6vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: 1.5rem;
}

.content h2 {
  margin-top: 2.4em;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.content h3 {
  margin-top: 1.8em;
  font-size: 1.1rem;
}

.content p,
.content li {
  color: var(--muted);
}

.notice {
  padding: 20px 24px;
  border-left: 4px solid var(--cyan);
  border-radius: 12px;
  background: color-mix(in srgb, var(--cyan) 8%, var(--surface));
  color: var(--ink);
  margin: 28px 0;
}

.meta {
  font-size: 0.92rem;
  color: var(--muted);
  margin-bottom: 28px;
}

.faq-item {
  margin-bottom: 24px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
}

.faq-item h3 {
  margin-top: 0;
  color: var(--ink);
}

.faq-item p:last-child {
  margin-bottom: 0;
}

.site-footer {
  padding: 36px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
  background: color-mix(in srgb, var(--bg) 95%, transparent);
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-links {
  display: flex;
  gap: 16px;
}

@media (max-width: 768px) {
  .site-header .wrap {
    padding-block: 14px;
    align-items: flex-start;
    flex-direction: column;
  }
  .hero {
    padding-top: 48px;
  }
  .grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b131a;
    --surface: #121e29;
    --ink: #edf4f8;
    --muted: #9eb1c2;
    --line: #223445;
    --cyan: #00adb5;
    --cyan-bright: #38e9f2;
    --focus: #4da3ff;
  }

  body {
    background: radial-gradient(circle at 90% -10%, #003840 0, transparent 35rem), var(--bg);
  }

  .card {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  }

  .button {
    color: #0b131a;
  }

  .button.secondary {
    color: var(--cyan);
  }

  .notice {
    background: #0d2730;
    color: #e0f7fa;
  }
}