/* --- Global Reset for Header --- */
.gt-main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 15px 0;
  z-index: 1000;
  background: rgba(5, 5, 5, 0.75); /* Deep dark with glass effect */
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: all 0.4s ease;
}

.gt-header-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 4%;
}

/* --- Logo Section --- */
.header-left {
  display: flex;
  align-items: center;
  gap: 15px;
}

.logo {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 2px solid #01f0ff; /* Blue accent instead of yellow for harmony */
  overflow: hidden;
  box-shadow: 0 0 15px rgba(1, 240, 255, 0.3);
  transition: 0.4s;
}

.logo:hover {
  transform: rotate(10deg) scale(1.1);
  box-shadow: 0 0 25px rgba(1, 240, 255, 0.5);
}

.logo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.logo-text h2 {
  font-size: 1.4rem;
  letter-spacing: 1px;
  color: #fff;
  text-transform: uppercase;
}

.logo-text p {
  font-size: 0.7rem;
  color: #01f0ff;
  letter-spacing: 2px;
  font-weight: 700;
}

/* --- Navigation Links --- */
.gt-nav ul {
  list-style: none;
  display: flex;
  gap: 3.5rem;
}

.nav-link {
  font-size: 1rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  position: relative;
  transition: 0.3s;
}

.nav-link:hover {
  color: #fff;
}

/* নিচের সুন্দর আন্ডারলাইন অ্যানিমেশন */
.nav-link::after {
  content: "";
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -5px;
  left: 0;
  background: #01f0ff;
  transition: 0.3s;
}

.nav-link:hover::after {
  width: 100%;
}

/* ACTIVE NAV LINK */

.nav-link.active {
  color: #00f2ff;
  position: relative;
}

/* glow underline effect */
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 2px;
  background: #00f2ff;
  box-shadow: 0 0 10px #00f2ff;
}

/* --- Premium Button --- */
.nav-btn {
  padding: 12px 28px;
  background: transparent;
  color: #fff;
  border: 1px solid rgba(1, 240, 255, 0.4);
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.nav-btn i {
  font-size: 1.2rem;
  color: #01f0ff;
}

.nav-btn:hover {
  background: #01f0ff;
  color: #000;
  border-color: #01f0ff;
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(1, 240, 255, 0.3);
}

.nav-btn:hover i {
  color: #000;
}

/* --- Fake Header (to prevent content jump) --- */
.fake-header {
  height: 85px;
  width: 100%;
  background-color: #0a1217;
}

.menu-toggle {
  display: none;
  font-size: 28px;
  color: #fff;
  cursor: pointer;
  z-index: 1100;
}

.mobile-contact {
  display: none;
}

/* ===== Mobile View ===== */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .gt-main-header {
    background: rgba(5, 5, 5, 0.95);
  }

  .gt-nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(5, 5, 5, 0.95);
    backdrop-filter: blur(15px);

    max-height: 0;
    overflow: hidden;
    transition: 0.4s ease;
  }

  .gt-nav ul {
    flex-direction: column;
    padding: 20px 0;
    gap: 20px;
    text-align: center;
  }

  .gt-nav.active {
    max-height: 300px;
  }

  .header-right {
    display: none; /* mobile e button hide */
  }

  .mobile-contact {
    display: block;
  }
}