/* ===================================================
   PyLearn — Navigation Bar
   =================================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 72px;
  background: rgba(255, 248, 240, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--ease), box-shadow var(--ease);
}

[data-theme="dark"] .navbar {
  background: rgba(26, 26, 46, 0.90);
}

.navbar.scrolled {
  box-shadow: 0 2px 24px rgba(255, 107, 53, 0.10);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 var(--sp-8);
}

/* ─── Logo ─────────────────────────────────────── */
.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  text-decoration: none;
  flex-shrink: 0;
}

.navbar-logo-icon {
  width: 38px;
  height: 38px;
  background: var(--orange);
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: transform var(--ease-bounce);
}

.navbar-logo:hover .navbar-logo-icon {
  transform: rotate(-8deg) scale(1.1);
}

.navbar-logo-text {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--text);
  letter-spacing: -0.01em;
}

.navbar-logo-text span { color: var(--orange); }

/* ─── Nav Links ────────────────────────────────── */
.navbar-links {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  list-style: none;
}

.navbar-links a {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 0.45rem 0.85rem;
  border-radius: var(--r-sm);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--ease);
  white-space: nowrap;
}

.navbar-links a:hover,
.navbar-links a.active {
  background: rgba(255, 107, 53, 0.10);
  color: var(--orange);
}

.navbar-links a .nav-icon { font-size: 1rem; }

/* ─── Right Controls ───────────────────────────── */
.navbar-right {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

/* Streak */
.streak-counter {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  background: rgba(255, 107, 53, 0.10);
  border: 1.5px solid rgba(255, 107, 53, 0.20);
  border-radius: var(--r-full);
  padding: 0.3rem 0.8rem;
  font-weight: 800;
  font-size: 0.85rem;
  color: var(--orange);
  cursor: pointer;
  transition: all var(--ease);
  text-decoration: none;
}
.streak-counter:hover {
  background: rgba(255, 107, 53, 0.18);
  transform: scale(1.05);
  color: var(--orange);
}
.streak-counter .streak-icon { font-size: 1rem; }

/* Dark Mode Toggle */
.dark-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--r-sm);
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all var(--ease);
}
.dark-toggle:hover {
  background: var(--surface-hover);
  color: var(--orange);
  border-color: var(--orange);
  transform: rotate(20deg);
}

/* ─── Mobile Hamburger ─────────────────────────── */
.hamburger {
  display: none;
  width: 40px;
  height: 40px;
  border: 1.5px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--surface);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  transition: all var(--ease);
}

.hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--ease);
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ─── Mobile Drawer ────────────────────────────── */
.mobile-menu {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: var(--sp-4) var(--sp-6) var(--sp-6);
  z-index: 999;
  box-shadow: 0 8px 32px rgba(0,0,0,0.12);
  animation: fade-in-up 0.25s ease;
}

.mobile-menu.open { display: block; }

.mobile-menu ul { list-style: none; }
.mobile-menu ul li + li { border-top: 1px solid var(--border); }
.mobile-menu a {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-4) 0;
  font-weight: 700;
  color: var(--text);
  font-size: 1rem;
  text-decoration: none;
  transition: color var(--ease);
}
.mobile-menu a:hover { color: var(--orange); }
.mobile-menu a .nav-icon { font-size: 1.2rem; }

/* ─── Responsive ───────────────────────────────── */
@media (max-width: 900px) {
  .navbar-links { display: none; }
  .hamburger    { display: flex; }
  .navbar-inner { padding: 0 var(--sp-4); }
}

@media (max-width: 480px) {
  .streak-counter .streak-label { display: none; }
}