/* ========================================
   HEADER / NAVIGATION
   ======================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition-normal);
}

.navbar {
    padding: 16px 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo */
.logo {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--color-text-primary);
}
.logo .highlight {
    color: var(--color-primary);
}
.logo-text {
    letter-spacing: -0.5px;
}

/* Navigation Links */
.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    position: relative;
    transition: color var(--transition-fast);
    padding: 4px 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-normal);
    border-radius: 2px;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-text-primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    transition: transform var(--transition-fast);
}

.hamburger .bar {
    width: 28px;
    height: 2.5px;
    background: var(--color-text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
    transform-origin: center;
}

.hamburger.active .bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.active .bar:nth-child(2) {
    opacity: 0;
}
.hamburger.active .bar:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Responsive Header */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--color-bg-secondary);
        flex-direction: column;
        align-items: center;
        padding: 30px 20px;
        gap: 20px;
        transform: translateY(-120%);
        transition: transform var(--transition-slow);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-links.active {
        transform: translateY(0);
    }
    
    .nav-links a {
        font-size: 1.1rem;
        width: 100%;
        text-align: center;
        padding: 10px 0;
    }
    
    .nav-links a::after {
        display: none;
    }
}