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

:root {
  --primary: #1677ff;
  --primary-dark: #0958d9;
  --primary-darker: #003a8c;
  --primary-light: #e6f4ff;
  --primary-mid: #bae0ff;
  --accent: #13c2c2;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --bg: #f0f7ff;
  --bg-alt: #f8fafc;
  --primary-glow: rgba(22, 119, 255, 0.28);
  --primary-glow-soft: rgba(22, 119, 255, 0.12);
  --footer-bg: #0c2d5c;
  --footer-text: #94a3b8;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif;
  color: var(--text-primary);
  background: #fff;
  line-height: 1.6;
}

nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 rgba(22, 119, 255, 0.06);
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

nav::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 50%, var(--primary-dark) 100%);
  opacity: 0.85;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  min-width: 0;
}

.nav-logo span {
  line-height: 1.25;
}

.nav-logo .dot {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  overflow: hidden;
  flex-shrink: 0;
  box-shadow: 0 2px 8px var(--primary-glow-soft);
}

.nav-logo .dot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-back {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
}

.nav-back:hover {
  color: var(--primary);
}

footer {
  background: var(--footer-bg);
  border-top: none;
  padding: 36px 24px;
  text-align: center;
  font-size: 13px;
  color: var(--footer-text);
}

footer a {
  color: #cbd5e1;
  text-decoration: none;
  margin: 0 10px;
  transition: color 0.2s;
}

footer a:hover {
  color: #fff;
}

.footer-brand {
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  font-size: 15px;
}

@media (max-width: 600px) {
  .nav-links { display: none; }
  .nav-logo { font-size: 13px; }
  .nav-logo span { max-width: calc(100vw - 72px); }
}