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

:root {
  font-family: var(--font-family-ja), var(--font-family-en);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background-color: var(--paper);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
  background-color: inherit;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--success);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--spacing-sm);
}

ul,
ol {
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-md);
}

li {
  margin-bottom: var(--spacing-xs);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xl) 0;
}

.card {
  background-color: var(--card);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  box-shadow: 0 2px 8px var(--shadow);
  border: 1px solid var(--border);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--accent);
  color: var(--white);
}

.btn-primary:hover {
  background-color: var(--success);
  color: var(--white);
}

.btn-secondary {
  background-color: var(--white);
  color: var(--ink);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background-color: var(--wash);
  border-color: var(--accent);
  color: var(--accent);
}

.btn-large {
  padding: 16px 32px;
  font-size: 1.125rem;
}

.icon {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.icon-sm {
  width: 16px;
  height: 16px;
}

.icon-lg {
  width: 32px;
  height: 32px;
}

.icon-xl {
  width: 48px;
  height: 48px;
}

.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.text-center {
  text-align: center;
}

.text-muted {
  color: var(--ink-muted);
}

.text-accent {
  color: var(--accent);
}

.background-orb {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.background-grid {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  opacity: 0.18;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}