/* nav.css */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(9, 9, 9, 0.88);
  backdrop-filter: blur(12px) saturate(1.4);
  -webkit-backdrop-filter: blur(12px) saturate(1.4);
  border-bottom: 1px solid var(--clr-border);
  transition: background var(--t-base) var(--ease-out),
              border-color var(--t-base) var(--ease-out);
}

.nav.scrolled {
  background: rgba(9, 9, 9, 0.97);
  border-color: var(--clr-border-h);
}

.nav__inner {
  max-width: 1060px;
  margin-inline: auto;
  padding-inline: var(--space-5);
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .nav__inner {
    padding-inline: var(--space-8);
  }
}

/* Brand */
.nav__brand {
  display: flex;
  align-items: center;
  gap: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--clr-text);
  letter-spacing: -0.01em;
  white-space: nowrap;
  flex-shrink: 0;
  transition: opacity var(--t-fast);
}

.nav__brand:hover {
  opacity: 0.8;
}

.nav__prompt {
  color: var(--clr-accent);
  margin-right: 6px;
}

.nav__name {
  color: var(--clr-text);
}

/* The signature green blinking cursor */
.nav__cursor {
  display: inline-block;
  width: 8px;
  height: 15px;
  background: var(--clr-cursor);
  margin-left: 3px;
  border-radius: 1px;
  box-shadow: 0 0 6px var(--clr-cursor-glow),
              0 0 14px rgba(57, 255, 102, 0.2);
  animation: blink-cursor 1.1s step-end infinite;
  vertical-align: middle;
  position: relative;
  top: -1px;
}

@keyframes blink-cursor {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

/* Desktop links */
.nav__links {
  display: none;
  align-items: center;
  gap: var(--space-6);
  margin-left: auto;
}

@media (min-width: 640px) {
  .nav__links {
    display: flex;
  }
}

.nav__link {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--clr-text-dim);
  letter-spacing: 0.06em;
  text-transform: lowercase;
  padding-block: var(--space-1);
  position: relative;
  transition: color var(--t-fast);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--clr-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-base) var(--ease-out);
}

.nav__link:hover,
.nav__link.active {
  color: var(--clr-text);
}

.nav__link:hover::after,
.nav__link.active::after {
  transform: scaleX(1);
}

/* GitHub pill */
.nav__social {
  display: none;
}

@media (min-width: 768px) {
  .nav__social {
    display: flex;
    align-items: center;
  }
}

.nav__gh {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 12px;
  border: 1px solid var(--clr-border-h);
  border-radius: 100px;
  background: var(--clr-bg-card);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--clr-text-mid);
  transition: border-color var(--t-base),
              color var(--t-base),
              background var(--t-base);
  white-space: nowrap;
}

.nav__gh:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
}

.icon--gh {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* Hamburger */
.nav__menu-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  margin-left: auto;
  border-radius: var(--r-sm);
  transition: background var(--t-fast);
}

@media (min-width: 640px) {
  .nav__menu-btn {
    display: none;
  }
}

.nav__menu-btn:hover {
  background: var(--clr-bg-card);
}

.nav__menu-btn span {
  display: block;
  height: 1.5px;
  background: var(--clr-text-mid);
  border-radius: 2px;
  transition: transform var(--t-base) var(--ease-out),
              opacity var(--t-fast);
}

.nav__menu-btn[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav__menu-btn[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav__menu-btn[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile menu */
.nav__mobile-menu {
  display: flex;
  flex-direction: column;
  background: rgba(9, 9, 9, 0.98);
  border-bottom: 1px solid var(--clr-border);
  overflow: hidden;
  max-height: 0;
  transition: max-height var(--t-slow) var(--ease-out);
}

.nav__mobile-menu.open {
  max-height: 200px;
}

@media (min-width: 640px) {
  .nav__mobile-menu {
    display: none;
  }
}

.nav__mobile-link {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--clr-text-mid);
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--clr-border);
  transition: color var(--t-fast), background var(--t-fast);
  letter-spacing: 0.04em;
}

.nav__mobile-link:hover {
  color: var(--clr-text);
  background: var(--clr-bg-card);
}