/* ===== Header ===== */
.s-header{
  position: sticky;
  top: 0;
  z-index: 60;
  background: color-mix(in srgb, var(--c-surface) 94%, transparent);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-block-end: 1px solid var(--c-border);
  transition: box-shadow .25s ease, background .25s ease;
}
.s-header::before{
  content: "";
  position: absolute;
  inset-inline: 0;
  inset-block-start: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-secondary) 65%, var(--c-accent));
  pointer-events: none;
}
.s-header.is-stuck{
  background: color-mix(in srgb, var(--c-surface) 98%, transparent);
  box-shadow: var(--shadow-md);
}

.s-header__inner{
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--header-h);
}

/* Brand */
.s-header .brand{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-head);
  font-size: 1.3125rem;
  font-weight: 700;
  letter-spacing: .2px;
  line-height: 1.2;
  color: var(--c-primary);
  text-decoration: none;
  padding-block: 6px;
}
.s-header .brand:hover{ color: var(--c-secondary); }

/* Nav */
.s-header__nav{
  display: flex;
  align-items: center;
  gap: 32px;
}
.s-header__list{
  display: flex;
  align-items: center;
  gap: 32px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.s-header__list a{
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-family: var(--font-head);
  font-size: .9688rem;
  font-weight: 500;
  color: var(--c-text);
  text-decoration: none;
  transition: color .2s ease;
}
.s-header__list a::after{
  content: "";
  position: absolute;
  inset-inline: 0;
  inset-block-end: 6px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-secondary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform .22s ease;
}
.s-header__list a:hover,
.s-header__list a:focus-visible{ color: var(--c-primary); }
.s-header__list a:hover::after,
.s-header__list a:focus-visible::after{ transform: scaleX(1); }

.s-header__cta{
  min-height: 44px;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
}
.s-header__cta:hover{ box-shadow: var(--shadow-md); }

/* Burger */
.s-header__burger{
  display: none;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface);
  color: var(--c-primary);
  cursor: pointer;
  transition: background .2s ease, border-color .2s ease, color .2s ease;
}
.s-header__burger:hover{
  background: var(--c-tint);
  border-color: color-mix(in srgb, var(--c-primary) 30%, var(--c-border));
}
.s-header__burger:focus-visible{
  outline: 2px solid var(--c-secondary);
  outline-offset: 2px;
}

/* ===== Responsive ===== */
@media (max-width: 900px){
  .s-header__inner{ gap: 16px; }
  .s-header__burger{ display: inline-grid; }

  .s-header__nav{
    position: absolute;
    inset-inline: 0;
    inset-block-start: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 12px 20px 20px;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    background: var(--c-surface);
    border-block-start: 1px solid var(--c-border);
    border-block-end: 1px solid var(--c-border);
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity .22s ease, transform .22s ease, visibility .22s ease;
  }
  .s-header__nav.is-open{
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }
  .s-header__list{
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }
  .s-header__list li + li{
    border-block-start: 1px solid var(--c-border);
  }
  .s-header__list a{
    padding-inline: 4px;
    font-size: 1rem;
  }
  .s-header__list a::after{ display: none; }
  .s-header__cta{
    width: 100%;
    justify-content: center;
    margin-block-start: 12px;
  }
}

@media (max-width: 600px){
  .s-header__inner{ min-height: 64px; }
  .s-header .brand{ font-size: 1.125rem; }
  .s-header__nav{ padding: 10px 16px 18px; }
}