/* ═══════════════════════════════════════════════════════════
   NAV.CSS — Navigation & Custom Cursor
═══════════════════════════════════════════════════════════ */

/* ── Custom Cursor ── */
#cursor-dot {
  position: fixed;
  top: 0;
  left: 0;
  width: 7px; height: 7px;
  background: var(--navy);
  border-radius: 50%;
  pointer-events: none;
  z-index: var(--z-cursor);
  transform: translate3d(-100px, -100px, 0) translate(-50%, -50%);
  transition:
    width 0.2s, height 0.2s,
    background 0.2s;
  will-change: transform;
}

#cursor-ring {
  position: fixed;
  top: 0;
  left: 0;
  width: 32px; height: 32px;
  border: 1px solid rgba(27, 45, 80, 0.25);
  border-radius: 50%;
  pointer-events: none;
  z-index: calc(var(--z-cursor) - 1);
  transform: translate3d(-100px, -100px, 0) translate(-50%, -50%);
  transition:
    width 0.3s, height 0.3s,
    border-color 0.3s;
  will-change: transform;
}

body:has(a:hover) #cursor-dot,
body:has(button:hover) #cursor-dot {
  width: 11px; height: 11px;
  background: var(--accent);
}
body:has(a:hover) #cursor-ring,
body:has(button:hover) #cursor-ring {
  width: 48px; height: 48px;
  border-color: var(--accent);
  opacity: 0.5;
}

body:has(.ai-chat-bubble:hover) #cursor-dot {
  background: var(--ai-1);
  width: 13px; height: 13px;
}
body:has(.ai-chat-bubble:hover) #cursor-ring {
  border-color: var(--ai-1);
  width: 56px; height: 56px;
  opacity: 0.4;
}

body.cursor-light #cursor-dot {
  background: rgba(255, 255, 255, 0.92);
}

body.cursor-light #cursor-ring {
  border-color: rgba(255, 255, 255, 0.55);
  background: rgba(255, 255, 255, 0.05);
}

body.cursor-light:has(a:hover) #cursor-dot,
body.cursor-light:has(button:hover) #cursor-dot {
  background: var(--ai-3);
}

body.cursor-light:has(a:hover) #cursor-ring,
body.cursor-light:has(button:hover) #cursor-ring {
  border-color: rgba(255, 255, 255, 0.78);
}

@media (pointer: coarse) {
  #cursor-dot,
  #cursor-ring {
    display: none;
  }
}

/* ── Navigation ── */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px var(--section-x);
  background: rgba(248, 247, 244, 0.94);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition:
    border-color 0.4s,
    padding 0.35s;
}

#nav.scrolled {
  border-color: var(--rule);
  padding: 15px var(--section-x);
}

/* Wordmark */
.nav-wordmark {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
}
.nav-wordmark span {
  color: var(--accent);
}

/* Links */
.nav-links {
  display: flex;
  gap: 36px;
  list-style: none;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-60);
  text-decoration: none;
  position: relative;
  transition: color 0.25s;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width 0.3s ease;
}
.nav-links a:hover {
  color: var(--ink);
}
.nav-links a:hover::after {
  width: 100%;
}

/* AI badge in nav */
.nav-ai-badge {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--white);
  background: var(--ai-gradient);
  background-size: 200% 200%;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  animation: gradShift 4s ease-in-out infinite alternate;
  display: flex;
  align-items: center;
  gap: 5px;
}
.nav-ai-badge::before {
  content: '✦';
  font-size: 7px;
  animation: spin 3s linear infinite;
}
@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* Nav right group */
.nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-cta {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--white);
  background: var(--navy);
  padding: 10px 22px;
  text-decoration: none;
  transition: background 0.3s;
}
.nav-cta:hover {
  background: var(--accent);
}

/* Mobile hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--ink);
  transition: transform 0.3s, opacity 0.3s;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* Mobile nav drawer */
.nav-drawer {
  position: fixed;
  top: 0; right: 0;
  width: 280px; height: 100vh;
  background: var(--white);
  border-left: 1px solid var(--rule);
  z-index: calc(var(--z-nav) - 1);
  transform: translateX(100%);
  transition: transform 0.4s var(--ease-out);
  display: flex;
  flex-direction: column;
  padding: 96px 40px 40px;
  gap: 32px;
}
.nav-drawer.open {
  transform: translateX(0);
}
.nav-drawer a {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 300;
  color: var(--ink);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-drawer a:hover {
  color: var(--accent);
}
.nav-drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(24, 24, 24, 0.4);
  z-index: calc(var(--z-nav) - 2);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.nav-drawer-overlay.open {
  opacity: 1;
  pointer-events: all;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .nav-links { display: none; }
  .nav-ai-badge { display: none; }
  .nav-hamburger { display: flex; }
}