/* ===========================
   LIQUID GLASS NAVIGATION
   Apple-inspired frosted glass navbar
   =========================== */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(247, 250, 250, 0.62);
  backdrop-filter: blur(28px) saturate(200%) brightness(1.05);
  -webkit-backdrop-filter: blur(28px) saturate(200%) brightness(1.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.45);
  transition: all 0.35s ease;
}

[data-theme="dark"] .nav-header {
  background: rgba(12, 20, 20, 0.75);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.nav-header.scrolled {
  box-shadow: 0 4px 24px rgba(107, 79, 58, 0.10),
              0 1px 0 rgba(255,255,255,0.3) inset;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  color: var(--accent);
  padding: 4px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  text-decoration: none;
}
.nav-logo:hover {
  background: rgba(107, 79, 58, 0.07);
  transform: scale(1.05);
}
[data-theme="dark"] .nav-logo:hover {
  background: rgba(201, 160, 122, 0.10);
}

/* SVG mark */
.ik-mark {
  width: 38px;
  height: 38px;
  display: block;
  /* Inherit accent color via currentColor */
  transition: opacity var(--transition);
}
.nav-logo:hover .ik-mark {
  opacity: 0.85;
}

/* Desktop links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 1.8rem;
}

.nav-links a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
  position: relative;
  padding: 6px 2px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.3s var(--spring);
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }
.nav-links a.active { color: var(--accent); font-weight: 600; }

/* Controls */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Glass theme toggle */
.theme-toggle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all 0.3s var(--spring);
  color: var(--text);
  box-shadow: var(--glass-shadow);
}
.theme-toggle:hover {
  border-color: var(--accent);
  transform: rotate(22deg) scale(1.08);
  box-shadow: 0 4px 16px rgba(107,79,58,0.20);
}

[data-theme="light"] .moon,
[data-theme="dark"] .sun { display: none; }
[data-theme="light"] .sun,
[data-theme="dark"] .moon { display: block; }

/* Hamburger — glass pill */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 10px 11px;
  transition: all var(--transition);
  box-shadow: var(--glass-shadow);
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s var(--spring);
  transform-origin: center;
}
.hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0; transform: scaleX(0);
}
.hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav drawer — opens upward */
.nav-links.nav-open {
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  right: 0;
  bottom: var(--nav-h);
  padding: 32px 28px 28px;
  background: rgba(247, 250, 250, 0.94);
  backdrop-filter: blur(36px) saturate(220%);
  -webkit-backdrop-filter: blur(36px) saturate(220%);
  align-items: flex-start;
  gap: 1.25rem;
  z-index: 99;
  border-top: 1px solid var(--glass-border);
  border-radius: 24px 24px 0 0;
  box-shadow: 0 -8px 40px rgba(107,79,58,0.10);
  animation: slideUpMenu 0.35s var(--spring);
}

[data-theme="dark"] .nav-links.nav-open {
  background: rgba(12, 20, 20, 0.96);
  border-top: 1px solid rgba(255,255,255,0.07);
}

@keyframes slideUpMenu {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.nav-links.nav-open a {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  padding: 8px 0;
  width: 100%;
  border-bottom: 1px solid var(--border);
  transition: color var(--transition), padding-left var(--transition);
}
.nav-links.nav-open a:last-child { border-bottom: none; }
.nav-links.nav-open a:hover {
  color: var(--accent);
  padding-left: 8px;
}
.nav-links.nav-open a::after { display: none; }