* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #07102b 0, #02081a 45%, #000 100%);
  color: #f5f7ff;
  line-height: 1.8;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: #29b6ff; text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.page-header {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.page-header .logo {
  font-family: 'Orbitron', system-ui, sans-serif;
  font-size: 22px;
  font-weight: 900;
  background: linear-gradient(135deg, #29b6ff 0%, #b347ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-header .back-link {
  font-size: 13px;
  color: #9aa4c6;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.1);
  transition: all 0.18s ease;
}

.page-header .back-link:hover {
  border-color: #29b6ff;
  color: #f5f7ff;
  text-decoration: none;
}

/* Hero */
.page-hero {
  text-align: center;
  padding: 48px 24px 32px;
}

.page-hero h1 {
  font-family: 'Orbitron', system-ui, sans-serif;
  font-size: 28px;
  font-weight: 900;
  background: linear-gradient(135deg, #29b6ff 0%, #b347ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}

.page-hero .page-hero-en {
  font-size: 14px;
  color: #9aa4c6;
  letter-spacing: 0.5px;
}

/* Content */
.page-content {
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px 48px;
  flex: 1;
}

.page-card {
  background: linear-gradient(145deg, #050b22, #02081a);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  padding: 32px;
}

.page-card h2 {
  font-size: 18px;
  color: #29b6ff;
  margin: 24px 0 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.page-card h2:first-child {
  margin-top: 0;
}

.page-card p {
  margin-bottom: 12px;
  color: #cbd5e1;
  font-size: 14px;
}

.page-card ul {
  margin: 0 0 12px 20px;
  color: #cbd5e1;
  font-size: 14px;
}

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

.page-card strong {
  color: #f5f7ff;
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 99;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid rgba(41, 182, 255, 0.3);
  background: rgba(5, 11, 34, 0.85);
  color: #29b6ff;
  font-size: 20px;
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: all 0.18s ease;
  display: none;
}

.back-to-top:hover {
  background: rgba(41, 182, 255, 0.15);
  border-color: #29b6ff;
  box-shadow: 0 0 14px rgba(41, 182, 255, 0.4);
}

/* Responsive */
@media (max-width: 640px) {
  .page-hero h1 { font-size: 22px; }
  .page-content { padding: 0 16px 32px; }
  .page-card { padding: 20px; }
  .page-header { padding: 14px 16px; }
  .page-header .logo { font-size: 18px; }
}