:root {
  --bg: #0c1124;
  --fg: #eaf0f8;
  --muted: #a9b3c8;
  --accent: #78a6ff;
  --card: #121935;
  --stroke: #1e2a4f;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(12, 17, 36, 0.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--stroke);
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.header-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-decoration: none;
  line-height: 1;
}

.header-logo {
  display: block;
  height: 72px;
  width: auto;
  max-width: 320px;
  background: #fff;
  border-radius: 6px;
  padding: 6px 10px;
  image-rendering: auto;
}

.header-brand:hover { text-decoration: none; opacity: 0.92; }

nav {
  display: flex;
  gap: 2px;
  flex-wrap: wrap;
  align-items: center;
}

nav a {
  color: var(--muted);
  font-size: 14px;
  padding: 8px 12px;
  border-radius: 6px;
  font-weight: 500;
}

nav a:hover {
  color: var(--fg);
  background: rgba(120, 166, 255, 0.1);
  text-decoration: none;
}

nav a.active {
  color: var(--fg);
  background: rgba(120, 166, 255, 0.18);
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px 48px;
}

.page-main { padding-top: 32px; }

section { padding: 40px 0; }
section + section { border-top: 1px solid var(--stroke); }

.hero {
  padding-top: 24px;
  padding-bottom: 48px;
  text-align: center;
  border-bottom: none;
}

.logo {
  width: 220px;
  height: auto;
  margin: 0 auto 16px;
  display: block;
  background: #fff;
  border-radius: 6px;
  padding: 8px 10px;
}

.tagline {
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.03em;
  margin-bottom: 8px;
}

.page-title {
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(28px, 5vw, 36px);
  line-height: 1.2;
}

h2 {
  margin: 0 0 12px;
  font-size: 22px;
  line-height: 1.3;
}

h3 {
  margin: 0 0 10px;
  font-size: 17px;
  color: var(--accent);
}

p.lead {
  margin: 0 auto 20px;
  color: var(--muted);
  font-size: 17px;
  max-width: 620px;
  line-height: 1.65;
}

p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.65;
}

p strong { color: var(--fg); }

.tech-line {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.02em;
  margin: 16px 0 24px;
}

.btn-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 8px;
}

.btn {
  display: inline-block;
  padding: 11px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--stroke);
}

.btn-primary {
  background: var(--accent);
  color: #0c1124;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: #8fb8ff;
  text-decoration: none;
}

.btn-secondary {
  background: transparent;
  color: var(--fg);
}

.btn-secondary:hover {
  background: rgba(120, 166, 255, 0.1);
  text-decoration: none;
}

.diagram {
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: 10px;
  padding: 20px;
  margin: 20px 0;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
  overflow-x: auto;
  white-space: pre;
  text-align: center;
}

.diagram .hub { color: var(--accent); font-weight: 700; }

.methods {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 12px;
}

.method {
  background: rgba(120, 166, 255, 0.1);
  border: 1px solid var(--stroke);
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--fg);
}

.quote {
  margin: 16px 0;
  padding: 14px 18px;
  border-left: 3px solid var(--accent);
  background: rgba(120, 166, 255, 0.06);
  border-radius: 0 8px 8px 0;
  color: var(--muted);
  font-size: 15px;
  font-style: italic;
}

ul.examples {
  margin: 12px 0 20px;
  padding-left: 1.25rem;
  color: var(--muted);
  font-size: 15px;
}

ul.examples li { margin-bottom: 6px; }

.solution-grid {
  display: grid;
  gap: 14px;
  margin-top: 16px;
}

.solution {
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: 8px;
  padding: 16px 18px;
}

.solution h3 { margin-bottom: 6px; font-size: 15px; }
.solution p { margin: 0; font-size: 14px; }

.nav-cards {
  display: grid;
  gap: 14px;
  margin: 24px 0;
}

.nav-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: 8px;
  padding: 18px 20px;
  text-decoration: none;
  transition: border-color 0.15s;
}

.nav-card:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.nav-card h3 {
  margin: 0 0 6px;
  font-size: 16px;
  color: var(--fg);
}

.nav-card p {
  margin: 0;
  font-size: 14px;
}

.about-box {
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: 10px;
  padding: 20px 22px;
  margin-top: 12px;
}

.contact-box {
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: 10px;
  padding: 28px 24px;
  text-align: center;
  margin-top: 16px;
}

.contact-box p { margin-bottom: 16px; }

.contact-email {
  font-size: 18px;
  font-weight: 600;
}

.cta-block {
  text-align: center;
  padding: 48px 0;
}

footer {
  text-align: center;
  padding: 24px 20px 32px;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid var(--stroke);
}

footer nav {
  justify-content: center;
  margin-bottom: 16px;
}

@media (max-width: 640px) {
  .header-inner { justify-content: center; text-align: center; }
  nav { width: 100%; justify-content: center; }
}