:root {
  --navy: #14293D;
  --steel: #5E8FA4;
  --white: #fff;
  --bg: #F8FAFC;
}

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  background: var(--bg);
  height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.site-header {
  background: linear-gradient(90deg, #4b6b8e 60%, #14293D 100%);
  color: var(--white);
  height: 80px;
  flex-shrink: 0;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  padding: 0 16px;
}
.logo {
  height: 60px;
  width: auto;
  
}
.nav-links {
  display: flex;
  gap: 16px;
}
.nav-links a {
  color: var(--white);
  text-decoration: none;
  font-weight: 600;
  padding: 8px 10px;
  border-radius: 4px;
}
.nav-links a.active,
.nav-links a:hover {
  background: rgba(255,255,255,0.2);
}

/* Main frame area */
.main-frame {
  border: none;
  flex-grow: 1;
  width: 100%;
  height: calc(100vh - 80px);
  overflow: auto;
}