body {
  background-color: var(--color-base);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: 1.125rem;
  font-weight: 400;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(3rem, 6vw, 6rem); }
h2 { font-size: clamp(2.5rem, 5vw, 4.5rem); }
h3 { font-size: clamp(1.75rem, 3vw, 2.5rem); }

p {
  color: var(--color-text-secondary);
  max-width: 65ch;
  margin-bottom: var(--spacing-sm);
}

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

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

.section-padding-lg {
  padding-top: var(--spacing-xxl);
  padding-bottom: var(--spacing-xxl);
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: var(--spacing-md) var(--container-padding);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: var(--z-header);
  mix-blend-mode: difference; /* High contrast against any background */
  color: #fff; /* When mixed, it will appear dark on light */
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

/* Nav Menu Overlay */
.menu-toggle {
  background: transparent;
  border: none;
  font-family: var(--font-body);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: relative;
  overflow: hidden;
  padding: 0.5rem 1rem;
}

.menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: var(--color-base);
  z-index: calc(var(--z-header) - 1);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transform: translateY(-100%);
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition: transform var(--transition-slow), opacity var(--transition-fast), visibility 0s linear var(--transition-fast);
}

/* 强制兜底：无论是否有动画脚本，初始都不显示菜单蒙层，避免闪出半个“Contact”等文字 */
body:not(.menu-open) .menu-overlay {
  transform: translateY(-100%) !important;
  visibility: hidden !important;
  opacity: 0 !important;
  pointer-events: none !important;
}

.menu-overlay.is-active {
  transform: translateY(0);
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  transition: transform var(--transition-slow), opacity var(--transition-fast);
}

.menu-overlay nav ul {
  text-align: center;
}

.menu-overlay nav ul li {
  margin-bottom: var(--spacing-md);
}

.menu-overlay nav ul li a {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 4rem);
  color: var(--color-text-primary);
  position: relative;
  display: inline-block;
  overflow: hidden;
}

.menu-overlay nav ul li a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-text-primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-fast);
}

.menu-overlay nav ul li a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Footer */
.site-footer {
  background-color: var(--color-text-primary);
  color: var(--color-surface);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-heading {
  font-size: clamp(3rem, 5vw, 5rem);
  line-height: 1;
  margin-bottom: var(--spacing-md);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.footer-links a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-surface);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-md);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}