/* =====================================================
   HEADER.CSS - Navigation & Header Styles
   ===================================================== */

/* Header Base */
#header {
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

#header.scrolled {
    background: rgba(10, 10, 10, 0.95);
    border-bottom-color: rgba(255, 255, 255, 0.05);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

#header.scrolled nav {
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
}

/* Logo */
.logo-link {
    text-decoration: none;
    position: relative;
}

.logo-icon {
    box-shadow: 0 4px 15px rgba(15, 112, 191, 0.3);
    transition: all 0.3s ease;
}

.logo-link:hover .logo-icon {
    box-shadow: 0 6px 25px rgba(15, 112, 191, 0.5);
}

/* Navigation Links */
.nav-link {
    position: relative;
    color: #ffffff;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    padding: 0.5rem 0;
    transition: color 0.3s ease;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-link:hover {
    color: #0f70bf;
}

.nav-link:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.nav-link.active {
    color: #0f70bf;
}

.nav-link.active::after {
    transform: scaleX(1);
}

/* Mobile Menu Button */
#mobile-menu-btn {
    background: none;
    border: none;
    position: relative;
    z-index: 100;
}

.menu-line {
    display: block;
    transition: all 0.3s ease;
    transform-origin: center;
}

#mobile-menu-btn.active .menu-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

#mobile-menu-btn.active .menu-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

#mobile-menu-btn.active .menu-line:nth-child(3) {
    width: 1.5rem;
    transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.mobile-menu.open {
    max-height: 400px;
    opacity: 1;
}

.mobile-nav-link {
    display: block;
    color: #ffffff;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    padding: 0.75rem 0;
    position: relative;
    transition: all 0.3s ease;
}

.mobile-nav-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s ease;
}

.mobile-nav-link:hover {
    color: #0f70bf;
    padding-left: 1.5rem;
}

.mobile-nav-link:hover::before {
    width: 1rem;
}

/* Header Animation on Load */
@keyframes headerSlideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

#header {
    animation: headerSlideDown 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Responsive */
@media (max-width: 1024px) {
    .nav-link {
        font-size: 0.9rem;
    }
}

@media (max-width: 768px) {
    #header nav {
        padding: 1rem 1.5rem;
    }

    .logo-link span {
        font-size: 1rem;
    }

    .logo-icon {
        width: 2.5rem;
        height: 2.5rem;
    }

    .logo-icon span {
        font-size: 1rem;
    }
}