/* NAVBAR - Clean vertical centering with full-screen hamburger */

@import url('config.css');

.navbar {
  background: var(--navbar-bg);
  width: calc(100% - var(--navbar-margin) * 2);
  max-width: var(--content-max-width);
  margin: 0 auto;
  margin-bottom: calc(var(--navbar-margin) * 2);
  height: var(--navbar-height);
  display: flex;
  align-items: center;
  position: fixed;
  top: var(--navbar-margin);
  left: 50%;
  transform: translateX(-50%);
  z-index: 1001;
  transition: transform 0.3s ease-in-out;
}

.navbar.navbar-hidden {
  transform: translateX(-50%) translateY(calc(-100% - var(--navbar-margin)));
}

.navbar.menu-open .navbar-brand {
  visibility: hidden;
}

.navbar.menu-open {
  background: transparent;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 0;
  max-width: none;
  height: 100%;
}

.navbar-brand {
  display: flex;
  align-items: stretch;
  height: 100%;
}

.navbar-brand a {
  font-family: 'Silkscreen', monospace;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--navbar-text);
  background: var(--navbar-brand-bg);
  padding: 0 1rem;
  display: flex;
  align-items: center;
  transition: filter 0.2s ease;
}

.navbar-brand a:hover {
  color: var(--navbar-text);
  filter: brightness(var(--navbar-hover-brightness));
}

.navbar-menu {
  display: flex;
  gap: 0;
  align-items: stretch;
  height: 100%;
}

.navbar-item {
  font-family: 'Silkscreen', monospace;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--navbar-text);
  padding: 0 1rem;
  display: flex;
  align-items: center;
  height: 100%;
  transition: filter 0.2s ease;
}

.navbar-item:hover {
  color: var(--navbar-text);
  filter: brightness(var(--navbar-hover-brightness));
}

/* Individual navbar item colors */
.navbar-item[href*="/ai"] {
  background: var(--navbar-ai-bg);
}

.navbar-item[href*="/blog"] {
  background: var(--navbar-blog-bg);
}

.navbar-item[href*="/math"] {
  background: var(--navbar-math-bg);
}

/* Hamburger menu */
.navbar-burger {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  padding: 0.5rem;
  margin-right: 0.5rem;
  position: relative;
  z-index: 1001;
}

.navbar-burger span {
  width: 24px;
  height: 3px;
  background: var(--navbar-text);
  transition: all 0.3s ease-in-out;
  display: block;
}

.navbar-burger.is-active span {
  background: var(--text);
}

/* Spin animation */
.navbar-burger.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.navbar-burger.is-active span:nth-child(2) {
  opacity: 0;
}

.navbar-burger.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Full-screen mobile menu */
.mobile-menu-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: var(--bg);
  z-index: 1000;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0;
  padding: 0;
}

.mobile-menu-overlay.is-active {
  display: flex;
}

.mobile-menu-content {
  display: flex;
  flex-direction: column;
  width: 100%;
  gap: 0;
  margin: 0;
  padding: 0;
}

.mobile-menu-overlay .navbar-brand {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: stretch;
  margin: 0;
  padding: 0;
  height: var(--mobile-menu-item-height);
}

.mobile-menu-overlay .navbar-brand a {
  font-size: 1.5rem;
  padding: 0;
  margin: 0;
  width: 100%;
  text-align: center;
  height: var(--mobile-menu-item-height);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--navbar-brand-bg);
}

.mobile-menu-overlay .navbar-item {
  font-size: 1.5rem;
  padding: 0;
  margin: 0;
  width: 100%;
  text-align: center;
  height: var(--mobile-menu-item-height);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Mobile styles */
@media (max-width: 768px) {
  .navbar {
    width: calc(100% - var(--navbar-margin) * 2);
    left: var(--navbar-margin);
    transform: none;
    background: var(--navbar-brand-bg);
  }

  .navbar-brand a {
    background: transparent;
  }

  .navbar.navbar-hidden {
    transform: translateY(calc(-100% - var(--navbar-margin)));
  }

  .navbar .container {
    padding-left: 0;
    padding-right: 0;
  }

  .navbar-burger {
    display: flex;
  }

  .navbar-menu {
    display: none;
  }
}