/* Berta header — aligned with claudesign.berta.one / claudeprompt.berta.one landing.css */
:root {
  --bg: #000;
  --text: #fff;
  --text-2: #888;
  --text-3: #444;
  --gold: #c9a84c;
  --rule-2: #222;
  --panel: #080808;
  --display: "Syne", system-ui, sans-serif;
  --sans: "Inter", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 20px;
  margin-bottom: 48px;
  position: relative;
  z-index: 10;
  min-width: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(15px, 3.8vw, 18px);
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
  min-width: 0;
  flex: 1 1 auto;
}

.brand > span:first-of-type {
  min-width: 0;
  overflow-wrap: anywhere;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  flex-shrink: 0;
}

.brand .sub {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--text-3);
  text-transform: uppercase;
  margin-left: 2px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 28px;
  align-items: center;
  justify-content: flex-end;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-2);
}

.nav-links a {
  color: var(--text-2);
  text-decoration: none;
  touch-action: manipulation;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-links a[aria-current="page"] {
  color: var(--gold);
}

.nav-cta {
  background: var(--gold);
  color: var(--bg) !important;
  padding: 10px 16px;
  text-decoration: none;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 500;
  touch-action: manipulation;
}

.nav-cb {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  cursor: pointer;
  border: 1px solid var(--rule-2);
  background: var(--panel);
  padding: 0 10px;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
}

.nav-burger span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
}

@media (min-width: 901px) {
  .nav-cb,
  .nav-burger {
    display: none !important;
  }

  .nav-links {
    display: flex !important;
    flex-direction: row !important;
    width: auto !important;
    border: 0 !important;
    padding: 0 !important;
    margin: 0 !important;
  }

  .nav-links a {
    border: 0 !important;
    padding: 0 !important;
  }
}

@media (max-width: 900px) {
  .nav-burger {
    display: none;
  }

  .nav--stack .nav-burger {
    display: flex;
    order: 2;
  }

  .nav--stack {
    flex-wrap: wrap;
    align-items: center;
    gap: 0;
    row-gap: 0;
  }

  .nav--stack .brand {
    flex: 1;
    min-width: 0;
  }

  .nav--stack .nav-links {
    display: none;
    order: 10;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding: 12px 0 4px;
    margin-top: 12px;
    border-top: 1px solid var(--rule-2);
  }

  .nav--stack .nav-links a {
    padding: 14px 4px;
    border-bottom: 1px solid var(--rule-2);
  }

  .nav--stack .nav-links a:last-child {
    border-bottom: 0;
  }

  .nav--stack .nav-cb:checked ~ .nav-links {
    display: flex;
  }

  .nav--stack .nav-cta {
    text-align: center;
  }

  .nav:not(.nav--stack) {
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
  }

  .nav:not(.nav--stack) .nav-links {
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 10px 18px;
    row-gap: 12px;
  }
}

@media (max-width: 640px) {
  .nav {
    margin-bottom: 28px;
    padding-bottom: 12px;
  }
}