:root {
  --brand: #39ff14;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    sans-serif;
  background: #ffffff;
  color: #171717;
}

a {
  text-decoration: none;
  color: inherit;
}

button {
  font: inherit;
}

/* Header shell */

.header {
  position: relative;
  border-bottom: 1px solid #e5e5e5;
  background: #ffffff;
}

.header__inner {
  max-width: 80rem;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.5rem 1rem;
}

.header__brand {
  display: inline-block;
  flex-shrink: 0;
}

.header__wordmark {
  display: inline-block;
  font-size: clamp(1.375rem, 1rem + 2.2vw, 2.25rem);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
  color: #000000;
}

.header__right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.header__nav {
  display: none;
  align-items: center;
  gap: 2rem;
}

.header__link {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: #404040;
  transition: color 150ms ease;
}

.header__link:hover {
  color: #000000;
}

.header__link:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 4px;
  border-radius: 2px;
}

.header__cta {
  display: none;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: #000000;
}

.header__cta:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 4px;
  border-radius: 2px;
}

.header__cta-arrow {
  display: inline-block;
  transition: transform 150ms ease;
}

.header__cta:hover .header__cta-arrow,
.header__cta:focus-visible .header__cta-arrow {
  transform: translateX(2px);
}

.header__toggle {
  border: none;
  background: none;
  padding: 0;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: #000000;
  cursor: pointer;
  text-underline-offset: 4px;
}

.header__toggle:hover {
  text-decoration: underline;
}

.header__toggle:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 4px;
  border-radius: 2px;
}

/* Decorative rotated label */

.header__label {
  display: none;
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%) rotate(90deg);
  pointer-events: none;
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #a3a3a3;
}

/* Mobile dropdown panel */

.header__panel {
  position: absolute;
  inset-inline: 0;
  top: 100%;
  z-index: 20;
  border-bottom: 1px solid #e5e5e5;
  background: #ffffff;
  box-shadow: 0 12px 32px -12px rgba(0, 0, 0, 0.18);
}

@media (prefers-reduced-motion: no-preference) {
  .header__panel {
    animation: header09-panel-in 200ms cubic-bezier(0.16, 1, 0.3, 1) both;
  }
}

@keyframes header09-panel-in {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.header__mobile-nav {
  max-width: 80rem;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  padding: 0 1rem;
}

.header__mobile-link {
  padding: 1rem 0;
  border-bottom: 1px solid #f5f5f5;
  font-size: 1.125rem;
  font-weight: 500;
  color: #000000;
  transition: color 150ms ease;
}

.header__mobile-link:hover {
  color: #525252;
}

.header__mobile-link:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: -2px;
}

.header__mobile-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0;
  font-size: 1.125rem;
  font-weight: 600;
  color: #000000;
}

.header__mobile-cta:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: -2px;
}

.header__mobile-cta:hover .header__cta-arrow,
.header__mobile-cta:focus-visible .header__cta-arrow {
  transform: translateX(2px);
}

/* Reveal on load */

@media (prefers-reduced-motion: no-preference) {
  .header__wordmark {
    animation: header09-wipe 450ms cubic-bezier(0.16, 1, 0.3, 1) both;
  }

  .header__link,
  .header__cta {
    animation: header09-item-in 320ms cubic-bezier(0.16, 1, 0.3, 1) both;
  }
}

@keyframes header09-wipe {
  from {
    clip-path: inset(0 100% 0 0);
    opacity: 0;
  }
  to {
    clip-path: inset(0 0 0 0);
    opacity: 1;
  }
}

@keyframes header09-item-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Breakpoints — mobile-first cascade order so later (larger) rules
   correctly override earlier (smaller) ones instead of source-order
   fighting them. */

@media (min-width: 640px) {
  .header__inner,
  .header__mobile-nav {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .header__inner {
    padding-top: 2rem;
    padding-bottom: 2rem;
    padding-left: 2rem;
    padding-right: 4rem;
  }

  .header__nav {
    display: flex;
  }

  .header__cta {
    display: inline-flex;
  }

  .header__toggle {
    display: none;
  }

  .header__panel {
    display: none !important;
  }

  .header__label {
    display: block;
  }
}

@media (min-width: 1280px) {
  .header__inner {
    padding-right: 5rem;
  }

  .header__label {
    right: 1.5rem;
  }
}
Header 09

Requirements

Dependencies

Usage
