.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: 0.5rem;
    transition: all var(--transition-normal);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--navy-dark);
    color: white;
}

.btn-secondary:hover {
    background-color: var(--navy-light);
    transform: translateY(-2px);
}

.btn-outline {
    border: 2px solid var(--border-color);
    color: var(--navy-dark);
    background: transparent;
}

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-full {
    width: 100%;
}

.btn-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    background-color: var(--bg-white);
    color: var(--navy-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
    font-size: 1.25rem;
}

.btn-icon:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* ================== Go To Top Button ================== */
.go-to-top-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 3.5rem;
    height: 3.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 999;
}

.go-to-top-btn:hover {
    background-color: var(--navy-dark);
}

.go-to-top-btn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.go-to-top-btn.visible:hover {
    transform: translateY(-5px);
}

/* ================== Premium Portfolio Button ================== */
.btn-portfolio {
    background: linear-gradient(135deg, #1e293b, #0f172a);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 15px rgba(15, 23, 42, 0.2);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn-portfolio::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    z-index: -1;
    transition: opacity 0.4s ease;
    opacity: 0;
}

.btn-portfolio:hover {
    color: white;
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.4);
    border-color: rgba(59, 130, 246, 0.5);
}

.btn-portfolio:hover::before {
    opacity: 1;
}

.btn-portfolio i {
    transition: transform 0.4s ease;
}

.btn-portfolio:hover i {
    transform: translateX(4px);
}