/* ============================================================
   nav.css — IEEE Util Bar · Main Nav · Mobile Menu
   ============================================================ */

/* ── IEEE UTILITY BAR ────────────────────────────────────── */
.ieee-util-bar {
  height: var(--util-h);
  background: var(--color-bg-2);
  border-bottom: 1px solid var(--color-border);
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1001;
  display: flex;
  align-items: center;
  justify-content: center;
}

.util-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.util-inner a {
  font-size: 11px;
  color: var(--color-text-3);
  font-weight: 500;
  transition: color 0.2s;
}
.util-inner a:hover { color: var(--color-accent); }

.util-sep { color: var(--color-border-hover); font-size: 11px; }

/* ── MAIN NAV ────────────────────────────────────────────── */
.main-nav {
  position: fixed;
  top: var(--util-h);
  left: 0; right: 0;
  height: var(--nav-h);
  z-index: 1000;
  transition: background 0.3s ease, box-shadow 0.3s ease, backdrop-filter 0.3s;
}

.main-nav.scrolled {
  background: rgba(var(--color-bg-rgb), 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--color-border), 0 4px 24px rgba(0,0,0,0.12);
}

.nav-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--sp-3);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
}

.nav-logo-svg {
  height: 42px;
  width: auto;
  max-width: 240px;
  filter: drop-shadow(0 0 8px rgba(78,216,255,0.18));
  transition: filter 0.3s ease, transform 0.3s ease;
  display: block;
}
.nav-logo:hover .nav-logo-svg {
  filter: drop-shadow(0 0 16px rgba(255,79,163,0.4));
  transform: scale(1.02);
}

/* Light theme: darken the right-side text */
[data-theme="light"] .nav-logo-svg text[fill="#f2f1ee"] { fill: #1a1c22; }
[data-theme="light"] .nav-logo-svg text[fill="#8a8e97"] { fill: #4a4f5a; }

/* Mobile: hide college name text, show only IEEE SB MCET */
@media (max-width: 600px) {
  .nav-logo-svg {
    width: 80px;
    height: 36px;
    overflow: visible;
  }
}

/* Hide old img-based logo classes */
.logo-light, .logo-dark { display: none; }

/* Nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  padding: 8px 14px;
  border-radius: var(--r-btn);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-2);
  transition: color 0.2s, background 0.2s;
  position: relative;
}
.nav-link:hover { color: var(--color-text-1); background: var(--color-accent-soft); }
.nav-link.active { color: var(--color-accent); background: var(--color-accent-soft); }

/* Nav actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

/* Login (Beta) button */
.nav-login-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--r-btn);
  background: transparent;
  border: 1.5px solid var(--color-accent);
  color: var(--color-accent);
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-body);
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
  position: relative;
}
.nav-login-btn .beta-badge {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--color-accent);
  color: #fff;
  padding: 1px 5px;
  border-radius: var(--r-pill);
  line-height: 1.6;
}
.nav-login-btn:hover {
  background: var(--color-accent-soft);
  box-shadow: 0 0 12px rgba(255,79,163,0.25);
}

/* Theme toggle */
.theme-toggle {
  width: 38px; height: 38px;
  border-radius: var(--r-pill);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  background: var(--color-accent-soft);
  border: 1px solid var(--color-border);
  color: var(--color-text-1);
  transition: all 0.2s;
}
.theme-toggle:hover { background: rgba(59,91,219,0.2); border-color: var(--color-accent); }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 38px; height: 38px;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-btn);
  background: var(--color-accent-soft);
  border: 1px solid var(--color-border);
}
.hamburger span {
  display: block;
  width: 20px; height: 2px;
  background: var(--color-text-1);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.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 MENU ─────────────────────────────────────────── */
.mobile-menu {
  position: fixed;
  top: 0; right: -320px;
  width: 300px;
  height: 100dvh;
  background: var(--color-bg-2);
  border-left: 1px solid var(--color-border);
  z-index: 1100;
  transition: right 0.35s cubic-bezier(0.4,0,0.2,1);
  overflow-y: auto;
}
.mobile-menu.open { right: 0; }

.mobile-menu-inner {
  padding: var(--sp-3);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.mobile-close {
  align-self: flex-end;
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--r-pill);
  font-size: 1.1rem;
  background: var(--color-bg-3);
  color: var(--color-text-2);
  margin-bottom: var(--sp-3);
  border: 1px solid var(--color-border);
  transition: background 0.2s;
}
.mobile-close:hover { background: var(--color-accent-soft); color: var(--color-accent); }

.mobile-menu ul { display: flex; flex-direction: column; gap: 4px; flex: 1; }

.mobile-link {
  display: block;
  padding: 14px 16px;
  border-radius: var(--r-btn);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-1);
  border: 1px solid transparent;
  transition: all 0.2s;
}
.mobile-link:hover {
  background: var(--color-accent-soft);
  border-color: var(--color-border);
  color: var(--color-accent);
}

.mobile-util-links {
  margin-top: auto;
  padding-top: var(--sp-3);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.mobile-util-links a {
  font-size: 0.78rem;
  color: var(--color-text-3);
  padding: 4px 10px;
  border-radius: var(--r-pill);
  background: var(--color-bg-3);
  transition: color 0.2s;
}
.mobile-util-links a:hover { color: var(--color-accent); }

/* Overlay */
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 1099;
}
.mobile-overlay.open { display: block; }

/* ── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-login-btn .btn-label { display: none; }
  .nav-login-btn { padding: 7px 10px; }
}

@media (max-width: 480px) {
  .util-inner a:nth-child(n+7) { display: none; }
  .util-inner .util-sep:nth-child(n+6) { display: none; }
}

/* ── LOGIN MODAL ─────────────────────────────────────────── */
.login-modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: var(--sp-3);
}
.login-modal-overlay.open {
  display: flex;
}

.login-modal {
  background: var(--color-bg-2);
  border: 1px solid var(--color-border-hover);
  border-radius: var(--r-card);
  max-width: 480px;
  width: 100%;
  padding: var(--sp-5) var(--sp-4);
  position: relative;
  box-shadow: 0 32px 80px rgba(0,0,0,0.6), 0 0 0 1px var(--color-border);
  animation: modalIn 0.3s cubic-bezier(0.2,0.7,0.2,1) both;
  max-height: 90vh;
  overflow-y: auto;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.92) translateY(20px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.login-modal__close {
  position: absolute;
  top: 16px; right: 16px;
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--r-pill);
  background: var(--color-bg-3);
  border: 1px solid var(--color-border);
  color: var(--color-text-2);
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
}
.login-modal__close:hover {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.login-modal__icon {
  width: 60px; height: 60px;
  border-radius: var(--r-pill);
  background: var(--color-accent-soft);
  border: 1.5px solid rgba(255,79,163,0.25);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto var(--sp-3);
}

.login-modal__tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  background: rgba(255,138,42,0.12);
  border: 1px solid rgba(255,138,42,0.3);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-warning);
  margin-bottom: var(--sp-2);
}
.login-modal__tag-dot {
  width: 6px; height: 6px;
  border-radius: var(--r-pill);
  background: var(--color-warning);
  animation: pulse 1.5s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.8); }
}

.login-modal__title {
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-text-1);
  margin-bottom: var(--sp-2);
  text-align: center;
}

.login-modal__desc {
  font-size: 0.92rem;
  color: var(--color-text-2);
  line-height: 1.7;
  text-align: center;
  margin-bottom: var(--sp-4);
}

.login-modal__features {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: var(--sp-4);
  background: var(--color-bg-3);
  border: 1px solid var(--color-border);
  border-radius: var(--r-btn);
  padding: var(--sp-2);
}

.login-modal__feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--color-text-2);
}
.login-modal__feature-icon {
  width: 28px; height: 28px;
  border-radius: var(--r-btn);
  background: var(--color-accent-soft);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  color: var(--color-accent);
}

.login-modal__footer {
  text-align: center;
  font-size: 0.78rem;
  color: var(--color-text-3);
  border-top: 1px solid var(--color-border);
  padding-top: var(--sp-2);
  margin-top: var(--sp-1);
}

@media (max-width: 480px) {
  .login-modal {
    padding: var(--sp-4) var(--sp-3);
    max-height: 95vh;
  }
  .login-modal__icon {
    width: 50px; height: 50px;
    margin-bottom: var(--sp-2);
  }
  .login-modal__title {
    font-size: 1.3rem;
  }
  .login-modal__desc {
    font-size: 0.85rem;
    margin-bottom: var(--sp-3);
  }
  .login-modal__features {
    padding: var(--sp-2);
    margin-bottom: var(--sp-3);
  }
  .login-modal__feature {
    font-size: 0.8rem;
  }
  .login-modal__close {
    top: 12px; right: 12px;
  }
}