:root {
  --color-primary: #101828; /* Deep Enterprise Navy */
  --color-accent: #1877F2; 
  --color-dark: #050a14; 
  --color-text: #1d1d1f;
  --color-text-secondary: #475467;
  --color-bg: #ffffff;
  --color-bg-alt: #f9fafb;
  --color-border: #eaecf0;
  
  --font-family: 'Inter', -apple-system, system-ui, sans-serif;
  --font-heading: 'Inter', sans-serif;
  
  --container-width: 1200px;
  --header-height: 52px; /* slimmed down */
  --transition: 0.3s cubic-bezier(0.15, 1, 0.3, 1);
  --radius-enterprise: 6px; /* consistent small radius for enterprise feel */
}

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

html, body {
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.5;
  width: 100vw;
  overflow-x: hidden !important;
  -webkit-font-smoothing: antialiased;
}

/* ── ELITE VIEWPORT BLUE MARGIN LINE ── */
body::after {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border: 1px solid rgba(24, 119, 242, 0.15);
  pointer-events: none;
  z-index: 9999999 !important;
}

.site-header {
  height: var(--header-height);
  background: #ffffff; /* Solid white */
  border-bottom: 1px solid var(--color-border);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
}

.header-inner {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 16px; /* reduced to ensure single-line fit */
  font-weight: 800;
  text-decoration: none;
  color: var(--color-primary); 
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap; /* prevent wrapping */
}

.logo-icon {
  width: 22px;
  height: 22px;
  background: var(--color-accent);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 13px;
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: 12px;
  font-weight: 600;
  transition: all var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-link:hover {
  color: var(--color-accent);
}

/* ── UNIFIED HEADER BUTTONS ── */
.btn-header {
  height: 28px; /* hyper-slimmed down */
  padding: 0 12px;
  border-radius: 4px;
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em; /* wider spacing for elite look */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: all var(--transition);
  border: 1px solid transparent; /* thinner border */
}

.btn-header-outline {
  color: var(--color-primary);
  border-color: rgba(16, 24, 40, 0.3); /* subtle border */
}
.btn-header-outline:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

.btn-header-solid {
  background: var(--color-primary);
  color: white;
}
.btn-header-solid:hover {
  background: #1a2333;
  transform: translateY(-1px);
}

.btn {
  padding: 10px 20px;
  border-radius: var(--radius-enterprise);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.btn-solid-dark {
  background: #0a0f1e;
  color: white;
  border-color: #0a0f1e;
}
.btn-solid-dark:hover {
  background: #151b2d;
  transform: translateY(-1px);
}

.btn-outline-white {
  background: transparent;
  color: white;
  border-color: rgba(255,255,255,0.4);
}
.btn-outline-white:hover {
  border-color: white;
  background: rgba(255,255,255,0.05);
  transform: translateY(-1px);
}

.app-content {
  padding-top: var(--header-height);
}

/* ── ANIMATIONS ── */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(0,0,0,0.05);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
}