:root {
  --primary-white: #000000;
  --accent-blue: #4545c4;
  --text-primary: #ffffff;
  --text-secondary: #666666;
  --text-muted: #999999;
  --border-light: #f0f0f0;
  --border-hover: #e0e0e0;
  --background-subtle: #101010;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(69, 69, 196, 0.12);
}

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

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background: var(--primary-white);
  color: var(--text-primary);
  line-height: 1.6;
  font-feature-settings: "cv02", "cv03", "cv04", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.center {
  display: flex;
  justify-content: center;
  align-items: center;
}

.centers {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

/* Typography System */
.h1 {
  font-size: 2.75rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
}

.h2 {
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.h3 {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.body-large {
  font-size: 1.125rem;
  font-weight: 400;
  line-height: 1.7;
}

.body {
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
}

.caption {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.5;
}

.header {
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  gap: 2.5rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s ease;
  position: relative;
}

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

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-blue);
  border-radius: 1px;
}