/* ============================================
   STUDY PARTNER — Navbar
   ============================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  height: var(--nav-height);
  transition: all var(--dur-normal) var(--ease-out);
}

.navbar.is-scrolled {
  background: rgba(250, 248, 245, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--sp-8);
}

/* ── Logo ── */
.navbar__logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-family: var(--ff-heading);
  font-weight: var(--fw-bold);
  font-size: var(--fs-lg);
  color: var(--clr-primary);
  z-index: var(--z-modal);
}

.navbar__logo-icon {
  width: 36px;
  height: 36px;
  background: var(--clr-accent);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--dur-normal) var(--ease-spring);
}

.navbar__logo:hover .navbar__logo-icon {
  transform: rotate(-8deg) scale(1.05);
}

.navbar__logo-icon svg {
  width: 20px;
  height: 20px;
  color: var(--clr-primary);
}

/* ── Nav Links ── */
.navbar__links {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}

.navbar__link {
  font-family: var(--ff-heading);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--clr-text-light);
  position: relative;
  padding: var(--sp-1) 0;
  transition: color var(--dur-fast) var(--ease-out);
}

.navbar__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--clr-accent);
  border-radius: var(--radius-full);
  transition: width var(--dur-normal) var(--ease-out);
}

.navbar__link:hover,
.navbar__link.is-active {
  color: var(--clr-primary);
}

.navbar__link:hover::after,
.navbar__link.is-active::after {
  width: 100%;
}

/* ── Nav Actions ── */
.navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.navbar__login {
  font-family: var(--ff-heading);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--clr-text-light);
  transition: color var(--dur-fast) var(--ease-out);
}

.navbar__login:hover {
  color: var(--clr-primary);
}

/* ── Hamburger ── */
.navbar__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  z-index: var(--z-modal);
  cursor: pointer;
  gap: 5px;
}

.navbar__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-primary);
  border-radius: var(--radius-full);
  transition: all var(--dur-normal) var(--ease-out);
  transform-origin: center;
}

.navbar__hamburger.is-active span:nth-child(1) {
  transform: rotate(45deg) translate(2.5px, 2.5px);
}

.navbar__hamburger.is-active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.navbar__hamburger.is-active span:nth-child(3) {
  transform: rotate(-45deg) translate(2.5px, -2.5px);
}

/* ── Mobile Drawer ── */
.navbar__drawer {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(250, 248, 245, 0.98);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  z-index: var(--z-overlay);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-8);
  opacity: 0;
  transform: translateY(-10px);
  transition: all var(--dur-normal) var(--ease-out);
  pointer-events: none;
}

.navbar__drawer.is-open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}

.navbar__drawer .navbar__link {
  font-size: var(--fs-xl);
  font-weight: var(--fw-semibold);
  color: var(--clr-primary);
}

.navbar__drawer .navbar__actions {
  flex-direction: column;
  margin-top: var(--sp-6);
}

/* ── Responsive ── */
@media (max-width: 991px) {
  .navbar__links,
  .navbar__actions {
    display: none;
  }

  .navbar__hamburger {
    display: flex;
  }

  .navbar__drawer {
    display: flex;
  }
}

@media (max-width: 767px) {
  .navbar__inner {
    padding: 0 var(--sp-4);
  }
}