/**
 * AI Chronicle Design System - Global Navigation
 * Minimal floating pill navigation
 */

/* === GLOBAL NAV === */

.global-nav {
  position: fixed;
  top: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-nav);
  width: calc(100% - var(--space-8));
  max-width: 720px;
}

.global-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-2) var(--space-2) var(--space-5);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

[data-theme="dark"] .global-nav-inner {
  background: rgba(10, 10, 11, 0.9);
}

[data-theme="light"] .global-nav-inner {
  background: rgba(255, 255, 255, 0.9);
}

/* Logo */
.nav-logo {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  letter-spacing: var(--tracking-tight);
  text-decoration: none;
  transition: color var(--duration-150) var(--ease-out);
  white-space: nowrap;
}

.nav-logo:hover {
  color: var(--color-accent);
}

/* Main Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--duration-150) var(--ease-out);
}

.nav-link:hover {
  color: var(--color-text);
  background: var(--color-bg-muted);
}

.nav-link.active {
  color: var(--color-text);
  background: var(--color-bg-muted);
}

/* Actions (theme toggle, github) */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-action {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--duration-150) var(--ease-out);
}

.nav-action:hover {
  color: var(--color-text);
  background: var(--color-bg-muted);
}

.nav-action svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Theme toggle icons */
.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  display: none;
}

[data-theme="light"] .theme-toggle .icon-moon {
  display: block;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

/* Default to showing moon (for light mode) */
:root:not([data-theme]) .theme-toggle .icon-moon {
  display: block;
}

/* Mobile menu button */
.nav-menu-btn {
  display: none;
}

/* === MOBILE NAVIGATION === */

@media (max-width: 768px) {
  .global-nav {
    width: calc(100% - var(--space-4));
  }

  .nav-links {
    display: none;
  }

  .nav-menu-btn {
    display: flex;
  }

  /* Mobile menu open state */
  .global-nav.menu-open .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: calc(100% + var(--space-2));
    left: 0;
    right: 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2);
    box-shadow: var(--shadow-xl);
  }

  .global-nav.menu-open .nav-link {
    width: 100%;
    padding: var(--space-3) var(--space-4);
  }

  /* Hamburger icon animation */
  .nav-menu-btn .hamburger {
    width: 18px;
    height: 14px;
    position: relative;
  }

  .nav-menu-btn .hamburger span {
    display: block;
    position: absolute;
    width: 100%;
    height: 2px;
    background: currentColor;
    border-radius: var(--radius-full);
    transition: all var(--duration-200) var(--ease-out);
  }

  .nav-menu-btn .hamburger span:nth-child(1) {
    top: 0;
  }

  .nav-menu-btn .hamburger span:nth-child(2) {
    top: 6px;
  }

  .nav-menu-btn .hamburger span:nth-child(3) {
    top: 12px;
  }

  .global-nav.menu-open .nav-menu-btn .hamburger span:nth-child(1) {
    transform: rotate(45deg);
    top: 6px;
  }

  .global-nav.menu-open .nav-menu-btn .hamburger span:nth-child(2) {
    opacity: 0;
  }

  .global-nav.menu-open .nav-menu-btn .hamburger span:nth-child(3) {
    transform: rotate(-45deg);
    top: 6px;
  }
}

/* === SCROLL BEHAVIOR === */

.global-nav.scrolled .global-nav-inner {
  box-shadow: var(--shadow-xl);
}

/* Hide nav on scroll down, show on scroll up */
.global-nav.hidden {
  transform: translateX(-50%) translateY(-100%);
  opacity: 0;
  pointer-events: none;
}

.global-nav {
  transition:
    transform var(--duration-300) var(--ease-out),
    opacity var(--duration-300) var(--ease-out);
}

/* === PAGE-SPECIFIC NAV STYLES === */

/* Timeline page - darker nav in light mode */
.page-timeline .global-nav-inner {
  /* Keep consistent */
}

/* Learning paths - match path accent */
.page-learning-path .nav-link.active {
  color: var(--color-accent);
}

/* === NAV PADDING SPACER === */

/* Add this to pages to prevent content from being hidden under nav */
.nav-spacer {
  height: calc(var(--space-16) + var(--space-4));
}

@media (max-width: 768px) {
  .nav-spacer {
    height: calc(var(--space-12) + var(--space-4));
  }
}