.nav-shell {
  position: relative;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  min-height: 40px;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  display: block;
  width: 17px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

.nav-toggle-icon {
  position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-icon::before { top: -5px; }
.nav-toggle-icon::after { top: 5px; }

@media (max-width: 740px) {
  .header-inner {
    min-height: 58px;
    gap: 0.7rem;
  }

  .brand {
    flex: 0 0 auto;
  }

  .brand span:not(.brand-mark) {
    display: inline;
  }

  .nav-shell {
    margin-left: auto;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .primary-nav {
    display: none;
    position: absolute;
    top: calc(100% + 0.55rem);
    right: 0;
    width: min(270px, calc(100vw - 2rem));
    min-width: 0;
    padding: 0.5rem;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0.15rem;
    overflow: visible;
    white-space: normal;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 12px;
    box-shadow: var(--shadow);
    font-size: 0.9rem;
  }

  .nav-shell.is-open .primary-nav {
    display: flex;
  }

  .primary-nav a,
  .primary-nav a:not(.about-nav-link),
  .about-nav-link {
    display: inline-flex;
    width: 100%;
    min-height: 44px;
    padding: 0.65rem 0.75rem;
    border-radius: 8px;
  }

  .about-nav-link {
    background: var(--accent-soft);
    color: var(--accent-dark);
  }
}

@media (max-width: 360px) {
  .brand span:not(.brand-mark) {
    display: none;
  }
}