/* 2026-06 mobile polish: readable philosophy copy + smooth hamburger menu */
.nav-toggle {
  position: relative;
  width: 52px;
  height: 52px;
  border-radius: 999px;
  transition: background .22s ease, transform .22s ease;
  -webkit-tap-highlight-color: transparent;
}
.nav-toggle:hover { background: rgba(23,24,29,.06); }
.nav-toggle:active { transform: scale(.96); }
.nav-toggle span {
  transform-origin: center;
  transition: transform .34s cubic-bezier(.22,1,.36,1), opacity .22s ease, width .22s ease;
}
.nav-toggle.open span:first-child,
.nav-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.open span:last-child,
.nav-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 920px) {
  .site-nav {
    display: flex;
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-10px) scale(.96);
    transform-origin: top right;
    transition:
      opacity .28s ease,
      transform .34s cubic-bezier(.22,1,.36,1),
      visibility 0s linear .28s;
  }
  .site-nav.open {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0) scale(1);
    transition-delay: 0s;
  }
  .site-nav a {
    opacity: 0;
    transform: translateY(-6px);
    transition: opacity .24s ease, transform .28s cubic-bezier(.22,1,.36,1), background .22s ease, color .22s ease;
  }
  .site-nav.open a { opacity: 1; transform: translateY(0); }
  .site-nav.open a:nth-child(1) { transition-delay: .03s; }
  .site-nav.open a:nth-child(2) { transition-delay: .06s; }
  .site-nav.open a:nth-child(3) { transition-delay: .09s; }
  .site-nav.open a:nth-child(4) { transition-delay: .12s; }
  .site-nav.open a:nth-child(5) { transition-delay: .15s; }
  .site-nav.open a:nth-child(6) { transition-delay: .18s; }

  .strategy-copy {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .strategy-copy .strategy-title {
    max-width: 12em;
    font-size: clamp(38px, 11vw, 54px);
    line-height: 1.08;
  }
  .strategy-copy p {
    max-width: none;
    font-size: clamp(16px, 4.2vw, 18px);
    line-height: 1.86;
    letter-spacing: 0;
    word-break: normal;
    overflow-wrap: break-word;
  }
}

@media (max-width: 520px) {
  .site-header {
    inset: 12px 14px auto 14px;
    padding: 8px 10px 8px 16px;
  }
  .brand {
    min-width: 0;
    padding: 6px 10px 6px 6px;
  }
  .brand-logo { width: min(56vw, 220px); }
  .site-nav {
    left: 10px;
    right: 10px;
    top: calc(100% + 12px);
    min-width: 0;
    padding: 12px;
    border-radius: 28px;
    background: rgba(255,255,255,.90);
    border: 1px solid rgba(255,255,255,.74);
    backdrop-filter: blur(24px) saturate(160%);
  }
  .site-nav a {
    padding: 13px 16px;
    font-size: 15px;
  }
  .intro-section {
    padding-top: 76px;
  }
  .strategy-copy .strategy-title {
    max-width: 8.5em;
    font-size: clamp(40px, 12.4vw, 52px);
  }
}