/* nav.css — Navigation: topbar, nav, nav-group, dropdown, hamburger + login overlay styles */

.topbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(5,8,20,.88);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid rgba(28,43,72,.5);
  overflow: visible;
}
.topbar-inner {
  max-width: var(--max);
  margin: auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 18px;
  overflow: visible;
}
.brand {
  font-weight: 850;
  letter-spacing: .01em;
  color: #fff;
  white-space: nowrap;
  font-size: 15px;
  transition: opacity .2s;
}
.brand:hover { opacity: .85; text-decoration: none; }
.brand small {
  display: block;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: .16em;
  
  font-weight: 600;
  margin-top: 1px;
}

/* Nav bar */
.nav {
  display: flex;
  gap: 4px;
  align-items: center;
  overflow: visible;
  padding-bottom: 0;
  position: relative;
  z-index: 1001;
}
.nav-group {
  position: relative;
  overflow: visible;
  padding-bottom: 8px;
}
.nav-link, .nav-title {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 8px 11px;
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--soft);
  font-weight: 700;
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: all .2s;
  position: relative;
}
.nav-link:hover, .nav-title:hover {
  background: rgba(11,20,40,.8);
  box-shadow: inset 0 0 0 1px var(--line);
  text-decoration: none;
  color: #fff;
}
.nav-link.active, .nav-title.active {
  background: rgba(11,20,40,.8);
  box-shadow: inset 0 0 0 1px var(--line);
  color: #fff;
}
.nav-link.active::after, .nav-title.active::after {
  /* Bottom accent for active */
}
.nav-link.active::before {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 8px;
  right: 8px;
  height: 2px;
  background: var(--cyan);
  border-radius: 1px;
}
.nav-title::before {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 8px;
  right: 8px;
  height: 2px;
  background: var(--cyan);
  border-radius: 1px;
  opacity: 0;
  transition: opacity .2s;
}
.nav-title.active::before { opacity: 1; }
.nav-title::after {
  content: '▾';
  font-size: 10px;
  margin-left: 5px;
  color: var(--muted);
  transition: transform .2s;
}
.nav-title:hover::after { color: var(--cyan); }

/* Hover bridge */
.nav-group::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  pointer-events: none;
}
.nav-title {
  z-index: 2;
  position: relative;
}

/* Dropdown menu — slide-down animation */
.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: rgba(7,17,38,.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--line2);
  border-radius: 14px;
  padding: 6px;
  box-shadow: 0 24px 80px rgba(0,0,0,.6);
  z-index: 2000;
  /* Animation: slide down + fade in */
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
}
.nav-group:hover .dropdown {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.dropdown a {
  display: flex;
  align-items: center;
  padding: 9px 14px;
  color: var(--soft);
  font-size: 13px;
  font-weight: 600;
  border-radius: 10px;
  text-decoration: none;
  white-space: nowrap;
  transition: all .15s;
  border-left: 2px solid transparent;
}
.dropdown a:hover {
  background: rgba(75,231,242,.06);
  color: var(--cyan);
  text-decoration: none;
  border-left-color: var(--cyan);
  padding-left: 18px;
}

/* ─── Hamburger button — animated icon ─── */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px 8px;
  width: 36px;
  height: 36px;
  position: relative;
  flex-shrink: 0;
}
.hamburger .bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  position: absolute;
  left: 8px;
  transition: all .3s ease;
}
.hamburger .bar:nth-child(1) { top: 10px; }
.hamburger .bar:nth-child(2) { top: 17px; }
.hamburger .bar:nth-child(3) { top: 24px; }
.hamburger.open .bar:nth-child(1) { top: 17px; transform: rotate(45deg); }
.hamburger.open .bar:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open .bar:nth-child(3) { top: 17px; transform: rotate(-45deg); }

/* ─── Login overlay ─── */
#login-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(3,5,14,.96);
  backdrop-filter: blur(16px);
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
}
#login-overlay.hidden { display: none; }
.login-card {
  background: linear-gradient(145deg, rgba(11,20,40,.95) 0%, rgba(16,27,51,.8) 100%);
  border: 1px solid var(--line2);
  border-radius: 20px;
  padding: 40px 34px;
  width: 380px;
  max-width: 90vw;
  text-align: center;
  box-shadow: 0 30px 80px rgba(0,0,0,.7);
  backdrop-filter: blur(20px);
}
.login-card h2 {
  margin: 0 0 8px;
  font-size: 22px;
  color: #fff;
  background: linear-gradient(135deg, #fff 60%, var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.login-card p { color: var(--muted); margin: 0 0 22px; font-size: 14px; }
.login-card input[type=password] {
  width: 100%;
  padding: 13px 16px;
  background: rgba(5,8,20,.8);
  border: 1px solid var(--line2);
  border-radius: 12px;
  color: var(--text);
  font-size: 15px;
  outline: none;
  box-sizing: border-box;
  transition: border-color .2s, box-shadow .2s;
}
.login-card input[type=password]:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(75,231,242,.15);
}
.login-card button {
  margin-top: 16px;
  width: 100%;
  padding: 13px;
  background: linear-gradient(135deg, var(--cyan), #35c8d6);
  color: #050814;
  border: none;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition: transform .15s, box-shadow .2s;
}
.login-card button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(75,231,242,.3);
}
.login-error { color: var(--red); font-size: 13px; margin-top: 12px; display: none; }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-8px); }
  40%, 80% { transform: translateX(8px); }
}
.shake { animation: shake .4s; }

/* ─── Mobile responsive ─── */
@media(max-width:768px) {
  .hamburger { display: block; }
  .topbar-inner {
    align-items: center;
  }
  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(5,8,20,.96);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: 12px 18px;
    gap: 2px;
    max-height: 80vh;
    overflow-y: auto;
    /* Slide-down animation */
    transform: translateY(-10px);
    opacity: 0;
    transition: transform .25s ease, opacity .25s ease;
  }
  .nav.open {
    display: flex;
    transform: translateY(0);
    opacity: 1;
  }
  .nav-group { position: static; padding-bottom: 0; }
  .dropdown {
    position: static;
    box-shadow: none;
    background: transparent;
    border: none;
    padding: 0 0 0 16px;
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }
  .nav-group:not(:hover) .dropdown { opacity: 1; transform: none; pointer-events: auto; }
  .dropdown a { font-size: 12px; padding: 7px 10px; }
  .nav-link, .nav-title { font-size: 14px; padding: 10px 8px; }
  .nav-link.active::before { display: none; }
}