/* ═══════════════════════════════════════════════════════════
   TECHTRUTH.AI — Navigation
   ═══════════════════════════════════════════════════════════ */

nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--page-px);
  height: var(--nav-height);
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(24px);
  transition: background 0.4s, border-color 0.4s;
}

/* Accent line under nav */
nav::after {
  content: '';
  position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.4;
}

/* Logo */
.logo-svg { height: 64px; width: 340px; cursor: pointer; }
[data-theme="light"] .logo-svg { filter: var(--logo-filter); }

/* Center nav links */
.nav-center { display: flex; gap: 2px; align-items: center; }

.nav-btn {
  background: none; border: none; color: var(--text2);
  font-family: 'IBM Plex Mono', monospace; font-size: 11px; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase; cursor: pointer;
  padding: 8px 16px; border-radius: var(--radius-md);
  transition: all 0.2s; position: relative;
}
.nav-btn:hover,
.nav-btn.active { color: var(--text); background: var(--glow); }

/* Active underline indicator */
.nav-btn.active::after {
  content: ''; position: absolute; bottom: 2px; left: 50%;
  transform: translateX(-50%);
  width: 20px; height: 2px; background: var(--accent); border-radius: 1px;
}

/* "Coming soon" badge next to a nav item */
.coming-tag {
  font-size: 8px; font-weight: 600; letter-spacing: 0.1em;
  background: rgba(240, 165, 0, 0.15); color: var(--amber);
  border: 1px solid rgba(240, 165, 0, 0.3);
  padding: 2px 5px; border-radius: 3px; margin-left: 6px;
}

/* Right side */
.nav-right { display: flex; align-items: center; gap: 12px; }

/* Beta pill (+ learn mode subtitle) */
.beta-pill-wrap {
  display: flex; flex-direction: column; align-items: flex-end; gap: 2px;
}
.beta-pill-sub {
  font-family: 'IBM Plex Mono', monospace; font-size: 8px; font-style: italic;
  letter-spacing: 0.12em; color: var(--text3); text-transform: lowercase;
}
.beta-pill {
  display: flex; align-items: center; gap: 6px;
  font-family: 'IBM Plex Mono', monospace; font-size: 10px; font-weight: 700;
  letter-spacing: 0.18em; color: var(--amber);
  background: rgba(240, 165, 0, 0.10); border: 1px solid rgba(240, 165, 0, 0.30);
  padding: 6px 12px; border-radius: var(--radius-sm);
}
.beta-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--amber);
  animation: tt-blink 1.8s ease-in-out infinite;
}
@keyframes tt-blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }

/* Dark/Light toggle */
.theme-toggle {
  width: 44px; height: 24px; border-radius: 12px;
  background: var(--surface2); border: 1px solid var(--border2);
  cursor: pointer; position: relative; transition: all 0.3s;
  display: flex; align-items: center;
}
.toggle-knob {
  width: 18px; height: 18px; border-radius: 9px;
  background: var(--accent); position: absolute; left: 3px;
  transition: transform 0.3s;
  display: flex; align-items: center; justify-content: center; font-size: 10px;
}
[data-theme="light"] .toggle-knob { transform: translateX(20px); }

/* CTA button (nav) */
.btn-login {
  font-family: 'IBM Plex Mono', monospace; font-size: 11px; font-weight: 600;
  letter-spacing: 0.1em; text-transform: uppercase;
  background: transparent; border: 1px solid var(--border2);
  color: var(--text); padding: 8px 18px; border-radius: var(--radius-md);
  cursor: pointer; transition: all 0.2s;
}
.btn-login:hover { background: var(--glow); border-color: var(--accent); color: var(--accent); }



/* ─── MOBILE MENU (hamburger + overlay) ──────────────────── */

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--border2);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--text);
  transition: background 0.2s, border-color 0.2s;
}
.nav-toggle:hover { background: var(--glow); border-color: var(--accent); }
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform 0.3s, opacity 0.3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 199;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  flex-direction: column;
  padding: 24px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.nav-mobile.open { display: flex; }

.nav-mobile .nav-btn {
  width: 100%;
  padding: 16px 20px;
  text-align: left;
  font-size: 14px;
  letter-spacing: 0.1em;
  border-radius: var(--radius-md);
  margin-bottom: 4px;
  border: 1px solid transparent;
}
.nav-mobile .nav-btn:hover,
.nav-mobile .nav-btn.active { background: var(--glow); border-color: var(--border2); }

/* Show hamburger, hide center nav on tablet/mobile */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-center { display: none; }
}

/* Prevent body scroll when menu open */
body.menu-open { overflow: hidden; }

/* ─── RESPONSIVE NAV ─────────────────────────────────────── */

/* Medium screens — compress nav a bit */
@media (max-width: 1100px) {
  .logo-svg   { width: 260px; height: 52px; }
  .nav-btn    { padding: 8px 12px; letter-spacing: 0.06em; }
}

/* Tablet — hide nav links, keep logo + right */
@media (max-width: 768px) {
  .logo-svg   { width: 200px; height: 44px; }
  .nav-center { display: none; }
  nav         { padding: 0 24px; }
}

/* Mobile — compact logo, hide beta pill */
@media (max-width: 520px) {
  .logo-svg   { width: 150px; height: 34px; }
  .beta-pill-wrap  { display: none; }
  nav         { padding: 0 16px; }
  :root       { --nav-height: 72px; }
}

/* Small mobile */
@media (max-width: 380px) {
  .logo-svg   { width: 120px; height: 28px; }
}

/* ─── LIGHT MODE — highlight Start Audit nav button ─────── */
[data-theme="light"] .nav-btn[data-page="audit"] {
  color: #005bb5;
  font-weight: 600;
  border: 1px solid rgba(0, 91, 181, 0.30);
  background: rgba(0, 91, 181, 0.06);
}
[data-theme="light"] .nav-btn[data-page="audit"]:hover,
[data-theme="light"] .nav-btn[data-page="audit"].active {
  background: rgba(0, 91, 181, 0.12);
  border-color: #005bb5;
  color: #005bb5;
}